Commit | Line | Data |
---|---|---|
a0d0e21e LW |
1 | =head1 NAME |
2 | ||
3 | perldiag - various Perl diagnostics | |
4 | ||
5 | =head1 DESCRIPTION | |
6 | ||
7 | These messages are classified as follows (listed in increasing order of | |
8 | desperation): | |
9 | ||
10 | (W) A warning (optional). | |
11 | (D) A deprecation (optional). | |
12 | (S) A severe warning (mandatory). | |
13 | (F) A fatal error (trappable). | |
14 | (P) An internal error you should never see (trappable). | |
54310121 | 15 | (X) A very fatal error (nontrappable). |
cb1a09d0 | 16 | (A) An alien error message (not generated by Perl). |
a0d0e21e | 17 | |
748a9306 | 18 | Optional warnings are enabled by using the B<-w> switch. Warnings may |
68dc0745 | 19 | be captured by setting C<$SIG{__WARN__}> to a reference to a routine that |
20 | will be called on each warning instead of printing it. See L<perlvar>. | |
748a9306 LW |
21 | Trappable errors may be trapped using the eval operator. See |
22 | L<perlfunc/eval>. | |
a0d0e21e LW |
23 | |
24 | Some of these messages are generic. Spots that vary are denoted with a %s, | |
2ba9eb46 | 25 | just as in a printf format. Note that some messages start with a %s! |
a0d0e21e LW |
26 | The symbols C<"%-?@> sort before the letters, while C<[> and C<\> sort after. |
27 | ||
28 | =over 4 | |
29 | ||
30 | =item "my" variable %s can't be in a package | |
31 | ||
32 | (F) Lexically scoped variables aren't in a package, so it doesn't make sense | |
33 | to try to declare one with a package qualifier on the front. Use local() | |
34 | if you want to localize a package variable. | |
35 | ||
2ba9eb46 | 36 | =item "my" variable %s masks earlier declaration in same scope |
37 | ||
38 | (S) A lexical variable has been redeclared in the same scope, effectively | |
39 | eliminating all access to the previous instance. This is almost always | |
8b1a09fc | 40 | a typographical error. Note that the earlier variable will still exist |
2ba9eb46 | 41 | until the end of the scope or until all closure referents to it are |
42 | destroyed. | |
43 | ||
a0d0e21e LW |
44 | =item "no" not allowed in expression |
45 | ||
46 | (F) The "no" keyword is recognized and executed at compile time, and returns | |
47 | no useful value. See L<perlmod>. | |
48 | ||
49 | =item "use" not allowed in expression | |
50 | ||
51 | (F) The "use" keyword is recognized and executed at compile time, and returns | |
52 | no useful value. See L<perlmod>. | |
53 | ||
54 | =item % may only be used in unpack | |
55 | ||
5f05dabc | 56 | (F) You can't pack a string by supplying a checksum, because the |
a0d0e21e LW |
57 | checksumming process loses information, and you can't go the other |
58 | way. See L<perlfunc/unpack>. | |
59 | ||
60 | =item %s (...) interpreted as function | |
61 | ||
62 | (W) You've run afoul of the rule that says that any list operator followed | |
8b1a09fc | 63 | by parentheses turns into a function, with all the list operators arguments |
5f05dabc | 64 | found inside the parentheses. See L<perlop/Terms and List Operators (Leftward)>. |
a0d0e21e LW |
65 | |
66 | =item %s argument is not a HASH element | |
67 | ||
5f05dabc | 68 | (F) The argument to exists() must be a hash element, such as |
a0d0e21e LW |
69 | |
70 | $foo{$bar} | |
71 | $ref->[12]->{"susie"} | |
72 | ||
5f05dabc | 73 | =item %s argument is not a HASH element or slice |
74 | ||
75 | (F) The argument to delete() must be either a hash element, such as | |
76 | ||
77 | $foo{$bar} | |
78 | $ref->[12]->{"susie"} | |
79 | ||
80 | or a hash slice, such as | |
81 | ||
82 | @foo{$bar, $baz, $xyzzy} | |
83 | @{$ref->[12]}{"susie", "queue"} | |
84 | ||
a0d0e21e LW |
85 | =item %s did not return a true value |
86 | ||
87 | (F) A required (or used) file must return a true value to indicate that | |
88 | it compiled correctly and ran its initialization code correctly. It's | |
89 | traditional to end such a file with a "1;", though any true value would | |
90 | do. See L<perlfunc/require>. | |
91 | ||
92 | =item %s found where operator expected | |
93 | ||
94 | (S) The Perl lexer knows whether to expect a term or an operator. If it | |
95 | sees what it knows to be a term when it was expecting to see an operator, | |
96 | it gives you this warning. Usually it indicates that an operator or | |
97 | delimiter was omitted, such as a semicolon. | |
98 | ||
f86702cc | 99 | =item %s had compilation errors |
a0d0e21e LW |
100 | |
101 | (F) The final summary message when a C<perl -c> fails. | |
102 | ||
f86702cc | 103 | =item %s has too many errors |
a0d0e21e LW |
104 | |
105 | (F) The parser has given up trying to parse the program after 10 errors. | |
106 | Further error messages would likely be uninformative. | |
107 | ||
108 | =item %s matches null string many times | |
109 | ||
110 | (W) The pattern you've specified would be an infinite loop if the | |
111 | regular expression engine didn't specifically check for that. See L<perlre>. | |
112 | ||
113 | =item %s never introduced | |
114 | ||
115 | (S) The symbol in question was declared but somehow went out of scope | |
116 | before it could possibly have been used. | |
117 | ||
118 | =item %s syntax OK | |
119 | ||
120 | (F) The final summary message when a C<perl -c> succeeds. | |
121 | ||
f86702cc | 122 | =item %s: Command not found |
cb1a09d0 AD |
123 | |
124 | (A) You've accidentally run your script through B<csh> instead | |
3a52c276 CS |
125 | of Perl. Check the #! line, or manually feed your script into |
126 | Perl yourself. | |
cb1a09d0 | 127 | |
f86702cc | 128 | =item %s: Expression syntax |
cb1a09d0 AD |
129 | |
130 | (A) You've accidentally run your script through B<csh> instead | |
3a52c276 CS |
131 | of Perl. Check the #! line, or manually feed your script into |
132 | Perl yourself. | |
cb1a09d0 | 133 | |
f86702cc | 134 | =item %s: Undefined variable |
cb1a09d0 AD |
135 | |
136 | (A) You've accidentally run your script through B<csh> instead | |
3a52c276 CS |
137 | of Perl. Check the #! line, or manually feed your script into |
138 | Perl yourself. | |
cb1a09d0 AD |
139 | |
140 | =item %s: not found | |
141 | ||
8b1a09fc | 142 | (A) You've accidentally run your script through the Bourne shell |
3a52c276 | 143 | instead of Perl. Check the #! line, or manually feed your script |
cb1a09d0 AD |
144 | into Perl yourself. |
145 | ||
a0d0e21e LW |
146 | =item B<-P> not allowed for setuid/setgid script |
147 | ||
148 | (F) The script would have to be opened by the C preprocessor by name, | |
149 | which provides a race condition that breaks security. | |
150 | ||
151 | =item C<-T> and C<-B> not implemented on filehandles | |
152 | ||
153 | (F) Perl can't peek at the stdio buffer of filehandles when it doesn't | |
154 | know about your kind of stdio. You'll have to use a filename instead. | |
155 | ||
a5f75d66 AD |
156 | =item 500 Server error |
157 | ||
158 | See Server error. | |
159 | ||
a0d0e21e LW |
160 | =item ?+* follows nothing in regexp |
161 | ||
162 | (F) You started a regular expression with a quantifier. Backslash it | |
163 | if you meant it literally. See L<perlre>. | |
164 | ||
165 | =item @ outside of string | |
166 | ||
2ba9eb46 | 167 | (F) You had a pack template that specified an absolute position outside |
a0d0e21e LW |
168 | the string being unpacked. See L<perlfunc/pack>. |
169 | ||
170 | =item accept() on closed fd | |
171 | ||
172 | (W) You tried to do an accept on a closed socket. Did you forget to check | |
173 | the return value of your socket() call? See L<perlfunc/accept>. | |
174 | ||
175 | =item Allocation too large: %lx | |
176 | ||
54310121 | 177 | (X) You can't allocate more than 64K on an MS-DOS machine. |
55497cff | 178 | |
179 | =item Allocation too large | |
180 | ||
181 | (F) You can't allocate more than 2^31+"small amount" bytes. | |
a0d0e21e | 182 | |
2ae324a7 | 183 | =item Applying %s to %s will act on scalar(%s) |
184 | ||
185 | (W) The pattern match (//), substitution (s///), and translation (tr///) | |
186 | operators work on scalar values. If you apply one of them to an array | |
187 | or a hash, it will convert the array or hash to a scalar value -- the | |
188 | length of an array, or the population info of a hash -- and then work on | |
189 | that scalar value. This is probably not what you meant to do. See | |
190 | L<perlfunc/grep> and L<perlfunc/map> for alternatives. | |
191 | ||
a0d0e21e LW |
192 | =item Arg too short for msgsnd |
193 | ||
194 | (F) msgsnd() requires a string at least as long as sizeof(long). | |
195 | ||
748a9306 LW |
196 | =item Ambiguous use of %s resolved as %s |
197 | ||
198 | (W)(S) You said something that may not be interpreted the way | |
199 | you thought. Normally it's pretty easy to disambiguate it by supplying | |
5f05dabc | 200 | a missing quote, operator, parenthesis pair or declaration. |
748a9306 | 201 | |
a0d0e21e LW |
202 | =item Args must match #! line |
203 | ||
204 | (F) The setuid emulator requires that the arguments Perl was invoked | |
3a52c276 CS |
205 | with match the arguments specified on the #! line. Since some systems |
206 | impose a one-argument limit on the #! line, try combining switches; | |
207 | for example, turn C<-w -U> into C<-wU>. | |
a0d0e21e | 208 | |
f86702cc | 209 | =item Argument "%s" isn't numeric%s |
a0d0e21e LW |
210 | |
211 | (W) The indicated string was fed as an argument to an operator that | |
212 | expected a numeric value instead. If you're fortunate the message | |
213 | will identify which operator was so unfortunate. | |
214 | ||
215 | =item Array @%s missing the @ in argument %d of %s() | |
216 | ||
217 | (D) Really old Perl let you omit the @ on array names in some spots. This | |
218 | is now heavily deprecated. | |
219 | ||
220 | =item assertion botched: %s | |
221 | ||
222 | (P) The malloc package that comes with Perl had an internal failure. | |
223 | ||
224 | =item Assertion failed: file "%s" | |
225 | ||
226 | (P) A general assertion failed. The file in question must be examined. | |
227 | ||
228 | =item Assignment to both a list and a scalar | |
229 | ||
230 | (F) If you assign to a conditional operator, the 2nd and 3rd arguments | |
231 | must either both be scalars or both be lists. Otherwise Perl won't | |
232 | know which context to supply to the right side. | |
233 | ||
234 | =item Attempt to free non-arena SV: 0x%lx | |
235 | ||
236 | (P) All SV objects are supposed to be allocated from arenas that will | |
237 | be garbage collected on exit. An SV was discovered to be outside any | |
238 | of those arenas. | |
239 | ||
54310121 | 240 | =item Attempt to free nonexistent shared string |
bbce6d69 | 241 | |
242 | (P) Perl maintains a reference counted internal table of strings to | |
243 | optimize the storage and access of hash keys and other strings. This | |
244 | indicates someone tried to decrement the reference count of a string | |
245 | that can no longer be found in the table. | |
246 | ||
a0d0e21e LW |
247 | =item Attempt to free temp prematurely |
248 | ||
249 | (W) Mortalized values are supposed to be freed by the free_tmps() | |
250 | routine. This indicates that something else is freeing the SV before | |
251 | the free_tmps() routine gets a chance, which means that the free_tmps() | |
252 | routine will be freeing an unreferenced scalar when it does try to free | |
253 | it. | |
254 | ||
255 | =item Attempt to free unreferenced glob pointers | |
256 | ||
257 | (P) The reference counts got screwed up on symbol aliases. | |
258 | ||
259 | =item Attempt to free unreferenced scalar | |
260 | ||
261 | (W) Perl went to decrement the reference count of a scalar to see if it | |
262 | would go to 0, and discovered that it had already gone to 0 earlier, | |
263 | and should have been freed, and in fact, probably was freed. This | |
264 | could indicate that SvREFCNT_dec() was called too many times, or that | |
265 | SvREFCNT_inc() was called too few times, or that the SV was mortalized | |
266 | when it shouldn't have been, or that memory has been corrupted. | |
267 | ||
b7a902f4 | 268 | =item Attempt to use reference as lvalue in substr |
269 | ||
270 | (W) You supplied a reference as the first argument to substr() used | |
8b1a09fc | 271 | as an lvalue, which is pretty strange. Perhaps you forgot to |
b7a902f4 | 272 | dereference it first. See L<perlfunc/substr>. |
273 | ||
a0d0e21e LW |
274 | =item Bad arg length for %s, is %d, should be %d |
275 | ||
276 | (F) You passed a buffer of the wrong size to one of msgctl(), semctl() or | |
2ba9eb46 | 277 | shmctl(). In C parlance, the correct sizes are, respectively, |
5f05dabc | 278 | S<sizeof(struct msqid_ds *)>, S<sizeof(struct semid_ds *)>, and |
a0d0e21e LW |
279 | S<sizeof(struct shmid_ds *)>. |
280 | ||
a0d0e21e LW |
281 | =item Bad filehandle: %s |
282 | ||
283 | (F) A symbol was passed to something wanting a filehandle, but the symbol | |
284 | has no filehandle associated with it. Perhaps you didn't do an open(), or | |
285 | did it in another package. | |
286 | ||
287 | =item Bad free() ignored | |
288 | ||
289 | (S) An internal routine called free() on something that had never been | |
33c8a3fe IZ |
290 | malloc()ed in the first place. Mandatory, but can be disabled by |
291 | setting environment variable C<PERL_BADFREE> to 1. | |
292 | ||
293 | This message can be quite often seen with DB_File on systems with | |
294 | "hard" dynamic linking, like C<AIX> and C<OS/2>. It is a bug of | |
295 | C<Berkeley DB> which is left unnoticed if C<DB> uses I<forgiving> | |
296 | system malloc(). | |
a0d0e21e | 297 | |
aa689395 | 298 | =item Bad hash |
299 | ||
300 | (P) One of the internal hash routines was passed a null HV pointer. | |
301 | ||
a0d0e21e LW |
302 | =item Bad name after %s:: |
303 | ||
304 | (F) You started to name a symbol by using a package prefix, and then didn't | |
305 | finish the symbol. In particular, you can't interpolate outside of quotes, | |
306 | so | |
307 | ||
308 | $var = 'myvar'; | |
309 | $sym = mypack::$var; | |
310 | ||
311 | is not the same as | |
312 | ||
313 | $var = 'myvar'; | |
314 | $sym = "mypack::$var"; | |
315 | ||
316 | =item Bad symbol for array | |
317 | ||
318 | (P) An internal request asked to add an array entry to something that | |
319 | wasn't a symbol table entry. | |
320 | ||
321 | =item Bad symbol for filehandle | |
322 | ||
323 | (P) An internal request asked to add a filehandle entry to something that | |
324 | wasn't a symbol table entry. | |
325 | ||
326 | =item Bad symbol for hash | |
327 | ||
328 | (P) An internal request asked to add a hash entry to something that | |
329 | wasn't a symbol table entry. | |
330 | ||
8b1a09fc | 331 | =item Badly placed ()'s |
cb1a09d0 AD |
332 | |
333 | (A) You've accidentally run your script through B<csh> instead | |
3a52c276 CS |
334 | of Perl. Check the #! line, or manually feed your script into |
335 | Perl yourself. | |
cb1a09d0 | 336 | |
3fe9a6f1 | 337 | =item Bareword "%s" not allowed while "strict subs" in use |
338 | ||
339 | (F) With "strict subs" in use, a bareword is only allowed as a | |
340 | subroutine identifier, in curly braces or to the left of the "=>" symbol. | |
54310121 | 341 | Perhaps you need to predeclare a subroutine? |
3fe9a6f1 | 342 | |
a0d0e21e LW |
343 | =item BEGIN failed--compilation aborted |
344 | ||
345 | (F) An untrapped exception was raised while executing a BEGIN subroutine. | |
346 | Compilation stops immediately and the interpreter is exited. | |
347 | ||
68dc0745 | 348 | =item BEGIN not safe after errors--compilation aborted |
349 | ||
350 | (F) Perl found a C<BEGIN {}> subroutine (or a C<use> directive, which | |
351 | implies a C<BEGIN {}>) after one or more compilation errors had | |
352 | already occurred. Since the intended environment for the C<BEGIN {}> | |
353 | could not be guaranteed (due to the errors), and since subsequent code | |
354 | likely depends on its correct operation, Perl just gave up. | |
355 | ||
a0d0e21e LW |
356 | =item bind() on closed fd |
357 | ||
358 | (W) You tried to do a bind on a closed socket. Did you forget to check | |
359 | the return value of your socket() call? See L<perlfunc/bind>. | |
360 | ||
4633a7c4 LW |
361 | =item Bizarre copy of %s in %s |
362 | ||
363 | (P) Perl detected an attempt to copy an internal value that is not copiable. | |
364 | ||
a0d0e21e LW |
365 | =item Callback called exit |
366 | ||
367 | (F) A subroutine invoked from an external package via perl_call_sv() | |
368 | exited by calling exit. | |
369 | ||
0a753a76 | 370 | =item Can't "goto" outside a block |
371 | ||
372 | (F) A "goto" statement was executed to jump out of what might look | |
373 | like a block, except that it isn't a proper block. This usually | |
374 | occurs if you tried to jump out of a sort() block or subroutine, which | |
375 | is a no-no. See L<perlfunc/goto>. | |
376 | ||
a0d0e21e LW |
377 | =item Can't "last" outside a block |
378 | ||
379 | (F) A "last" statement was executed to break out of the current block, | |
380 | except that there's this itty bitty problem called there isn't a | |
381 | current block. Note that an "if" or "else" block doesn't count as a | |
0a753a76 | 382 | "loopish" block, as doesn't a block given to sort(). You can usually double |
383 | the curlies to get the same effect though, because the inner curlies | |
384 | will be considered a block that loops once. See L<perlfunc/last>. | |
a0d0e21e LW |
385 | |
386 | =item Can't "next" outside a block | |
387 | ||
388 | (F) A "next" statement was executed to reiterate the current block, but | |
389 | there isn't a current block. Note that an "if" or "else" block doesn't | |
0a753a76 | 390 | count as a "loopish" block, as doesn't a block given to sort(). You can |
391 | usually double the curlies to get the same effect though, because the inner | |
54310121 | 392 | curlies will be considered a block that loops once. See L<perlfunc/next>. |
a0d0e21e LW |
393 | |
394 | =item Can't "redo" outside a block | |
395 | ||
396 | (F) A "redo" statement was executed to restart the current block, but | |
397 | there isn't a current block. Note that an "if" or "else" block doesn't | |
0a753a76 | 398 | count as a "loopish" block, as doesn't a block given to sort(). You can |
399 | usually double the curlies to get the same effect though, because the inner | |
54310121 | 400 | curlies will be considered a block that loops once. See L<perlfunc/redo>. |
a0d0e21e LW |
401 | |
402 | =item Can't bless non-reference value | |
403 | ||
404 | (F) Only hard references may be blessed. This is how Perl "enforces" | |
405 | encapsulation of objects. See L<perlobj>. | |
406 | ||
407 | =item Can't break at that line | |
408 | ||
54310121 | 409 | (S) A warning intended to only be printed while running within the debugger, indicating |
a0d0e21e LW |
410 | the line number specified wasn't the location of a statement that could |
411 | be stopped at. | |
412 | ||
413 | =item Can't call method "%s" in empty package "%s" | |
414 | ||
415 | (F) You called a method correctly, and it correctly indicated a package | |
416 | functioning as a class, but that package doesn't have ANYTHING defined | |
417 | in it, let alone methods. See L<perlobj>. | |
418 | ||
419 | =item Can't call method "%s" on unblessed reference | |
420 | ||
54310121 | 421 | (F) A method call must know in what package it's supposed to run. It |
a0d0e21e LW |
422 | ordinarily finds this out from the object reference you supply, but |
423 | you didn't supply an object reference in this case. A reference isn't | |
424 | an object reference until it has been blessed. See L<perlobj>. | |
425 | ||
426 | =item Can't call method "%s" without a package or object reference | |
427 | ||
428 | (F) You used the syntax of a method call, but the slot filled by the | |
429 | object reference or package name contains an expression that returns | |
430 | neither an object reference nor a package name. (Perhaps it's null?) | |
431 | Something like this will reproduce the error: | |
432 | ||
433 | $BADREF = undef; | |
434 | process $BADREF 1,2,3; | |
435 | $BADREF->process(1,2,3); | |
436 | ||
437 | =item Can't chdir to %s | |
438 | ||
439 | (F) You called C<perl -x/foo/bar>, but C</foo/bar> is not a directory | |
440 | that you can chdir to, possibly because it doesn't exist. | |
441 | ||
442 | =item Can't coerce %s to integer in %s | |
443 | ||
444 | (F) Certain types of SVs, in particular real symbol table entries | |
55497cff | 445 | (typeglobs), can't be forced to stop being what they are. So you can't |
a0d0e21e LW |
446 | say things like: |
447 | ||
448 | *foo += 1; | |
449 | ||
450 | You CAN say | |
451 | ||
452 | $foo = *foo; | |
453 | $foo += 1; | |
454 | ||
455 | but then $foo no longer contains a glob. | |
456 | ||
457 | =item Can't coerce %s to number in %s | |
458 | ||
459 | (F) Certain types of SVs, in particular real symbol table entries | |
55497cff | 460 | (typeglobs), can't be forced to stop being what they are. |
a0d0e21e LW |
461 | |
462 | =item Can't coerce %s to string in %s | |
463 | ||
464 | (F) Certain types of SVs, in particular real symbol table entries | |
55497cff | 465 | (typeglobs), can't be forced to stop being what they are. |
a0d0e21e LW |
466 | |
467 | =item Can't create pipe mailbox | |
468 | ||
748a9306 LW |
469 | (P) An error peculiar to VMS. The process is suffering from exhausted quotas |
470 | or other plumbing problems. | |
a0d0e21e LW |
471 | |
472 | =item Can't declare %s in my | |
473 | ||
5f05dabc | 474 | (F) Only scalar, array, and hash variables may be declared as lexical variables. |
a0d0e21e LW |
475 | They must have ordinary identifiers as names. |
476 | ||
477 | =item Can't do inplace edit on %s: %s | |
478 | ||
479 | (S) The creation of the new file failed for the indicated reason. | |
480 | ||
54310121 | 481 | =item Can't do inplace edit without backup |
a0d0e21e | 482 | |
54310121 | 483 | (F) You're on a system such as MS-DOS that gets confused if you try reading |
3fe9a6f1 | 484 | from a deleted (but still opened) file. You have to say C<-i.bak>, or some |
a0d0e21e LW |
485 | such. |
486 | ||
8b1a09fc | 487 | =item Can't do inplace edit: %s E<gt> 14 characters |
a0d0e21e LW |
488 | |
489 | (S) There isn't enough room in the filename to make a backup name for the file. | |
490 | ||
491 | =item Can't do inplace edit: %s is not a regular file | |
492 | ||
493 | (S) You tried to use the B<-i> switch on a special file, such as a file in | |
494 | /dev, or a FIFO. The file was ignored. | |
495 | ||
496 | =item Can't do setegid! | |
497 | ||
498 | (P) The setegid() call failed for some reason in the setuid emulator | |
499 | of suidperl. | |
500 | ||
501 | =item Can't do seteuid! | |
502 | ||
503 | (P) The setuid emulator of suidperl failed for some reason. | |
504 | ||
505 | =item Can't do setuid | |
506 | ||
507 | (F) This typically means that ordinary perl tried to exec suidperl to | |
508 | do setuid emulation, but couldn't exec it. It looks for a name of the | |
509 | form sperl5.000 in the same directory that the perl executable resides | |
510 | under the name perl5.000, typically /usr/local/bin on Unix machines. | |
511 | If the file is there, check the execute permissions. If it isn't, ask | |
512 | your sysadmin why he and/or she removed it. | |
513 | ||
514 | =item Can't do waitpid with flags | |
515 | ||
516 | (F) This machine doesn't have either waitpid() or wait4(), so only waitpid() | |
517 | without flags is emulated. | |
518 | ||
8b1a09fc | 519 | =item Can't do {n,m} with n E<gt> m |
a0d0e21e LW |
520 | |
521 | (F) Minima must be less than or equal to maxima. If you really want | |
522 | your regexp to match something 0 times, just put {0}. See L<perlre>. | |
523 | ||
524 | =item Can't emulate -%s on #! line | |
525 | ||
526 | (F) The #! line specifies a switch that doesn't make sense at this point. | |
527 | For example, it'd be kind of silly to put a B<-x> on the #! line. | |
528 | ||
529 | =item Can't exec "%s": %s | |
530 | ||
5f05dabc | 531 | (W) An system(), exec(), or piped open call could not execute the named |
a0d0e21e LW |
532 | program for the indicated reason. Typical reasons include: the permissions |
533 | were wrong on the file, the file wasn't found in C<$ENV{PATH}>, the | |
534 | executable in question was compiled for another architecture, or the | |
535 | #! line in a script points to an interpreter that can't be run for | |
536 | similar reasons. (Or maybe your system doesn't support #! at all.) | |
537 | ||
538 | =item Can't exec %s | |
539 | ||
540 | (F) Perl was trying to execute the indicated program for you because that's | |
541 | what the #! line said. If that's not what you wanted, you may need to | |
542 | mention "perl" on the #! line somewhere. | |
543 | ||
544 | =item Can't execute %s | |
545 | ||
546 | (F) You used the B<-S> switch, but the script to execute could not be found | |
547 | in the PATH, or at least not with the correct permissions. | |
548 | ||
549 | =item Can't find label %s | |
550 | ||
551 | (F) You said to goto a label that isn't mentioned anywhere that it's possible | |
552 | for us to go to. See L<perlfunc/goto>. | |
553 | ||
554 | =item Can't find string terminator %s anywhere before EOF | |
555 | ||
556 | (F) Perl strings can stretch over multiple lines. This message means that | |
5f05dabc | 557 | the closing delimiter was omitted. Because bracketed quotes count nesting |
a0d0e21e LW |
558 | levels, the following is missing its final parenthesis: |
559 | ||
560 | print q(The character '(' starts a side comment.) | |
561 | ||
562 | =item Can't fork | |
563 | ||
564 | (F) A fatal error occurred while trying to fork while opening a pipeline. | |
565 | ||
748a9306 LW |
566 | =item Can't get filespec - stale stat buffer? |
567 | ||
568 | (S) A warning peculiar to VMS. This arises because of the difference between | |
569 | access checks under VMS and under the Unix model Perl assumes. Under VMS, | |
570 | access checks are done by filename, rather than by bits in the stat buffer, so | |
571 | that ACLs and other protections can be taken into account. Unfortunately, Perl | |
572 | assumes that the stat buffer contains all the necessary information, and passes | |
573 | it, instead of the filespec, to the access checking routine. It will try to | |
574 | retrieve the filespec using the device name and FID present in the stat buffer, | |
575 | but this works only if you haven't made a subsequent call to the CRTL stat() | |
5f05dabc | 576 | routine, because the device name is overwritten with each call. If this warning |
748a9306 LW |
577 | appears, the name lookup failed, and the access checking routine gave up and |
578 | returned FALSE, just to be conservative. (Note: The access checking routine | |
579 | knows about the Perl C<stat> operator and file tests, so you shouldn't ever | |
580 | see this warning in response to a Perl command; it arises only if some internal | |
581 | code takes stat buffers lightly.) | |
582 | ||
a0d0e21e LW |
583 | =item Can't get pipe mailbox device name |
584 | ||
748a9306 LW |
585 | (P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl |
586 | can't retrieve its name for later use. | |
a0d0e21e LW |
587 | |
588 | =item Can't get SYSGEN parameter value for MAXBUF | |
589 | ||
748a9306 LW |
590 | (P) An error peculiar to VMS. Perl asked $GETSYI how big you want your |
591 | mailbox buffers to be, and didn't get an answer. | |
a0d0e21e LW |
592 | |
593 | =item Can't goto subroutine outside a subroutine | |
594 | ||
595 | (F) The deeply magical "goto subroutine" call can only replace one subroutine | |
596 | call for another. It can't manufacture one out of whole cloth. In general | |
5f05dabc | 597 | you should be calling it out of only an AUTOLOAD routine anyway. See |
a0d0e21e LW |
598 | L<perlfunc/goto>. |
599 | ||
4633a7c4 LW |
600 | =item Can't localize a reference |
601 | ||
602 | (F) You said something like C<local $$ref>, which is not allowed because | |
603 | the compiler can't determine whether $ref will end up pointing to anything | |
604 | with a symbol table entry, and a symbol table entry is necessary to | |
605 | do a local. | |
606 | ||
748a9306 LW |
607 | =item Can't localize lexical variable %s |
608 | ||
2ba9eb46 | 609 | (F) You used local on a variable name that was previously declared as a |
748a9306 LW |
610 | lexical variable using "my". This is not allowed. If you want to |
611 | localize a package variable of the same name, qualify it with the | |
612 | package name. | |
613 | ||
a0d0e21e LW |
614 | =item Can't locate %s in @INC |
615 | ||
7a2e2cd6 | 616 | (F) You said to do (or require, or use) a file that couldn't be found |
54310121 | 617 | in any of the libraries mentioned in @INC. Perhaps you need to set the |
618 | PERL5LIB or PERL5OPT environment variable to say where the extra library | |
619 | is, or maybe the script needs to add the library name to @INC. Or maybe | |
a0d0e21e LW |
620 | you just misspelled the name of the file. See L<perlfunc/require>. |
621 | ||
622 | =item Can't locate object method "%s" via package "%s" | |
623 | ||
624 | (F) You called a method correctly, and it correctly indicated a package | |
625 | functioning as a class, but that package doesn't define that particular | |
2ba9eb46 | 626 | method, nor does any of its base classes. See L<perlobj>. |
a0d0e21e LW |
627 | |
628 | =item Can't locate package %s for @%s::ISA | |
629 | ||
630 | (W) The @ISA array contained the name of another package that doesn't seem | |
631 | to exist. | |
632 | ||
633 | =item Can't mktemp() | |
634 | ||
635 | (F) The mktemp() routine failed for some reason while trying to process | |
636 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. | |
637 | ||
638 | =item Can't modify %s in %s | |
639 | ||
640 | (F) You aren't allowed to assign to the item indicated, or otherwise try to | |
5f05dabc | 641 | change it, such as with an auto-increment. |
a0d0e21e | 642 | |
54310121 | 643 | =item Can't modify nonexistent substring |
a0d0e21e LW |
644 | |
645 | (P) The internal routine that does assignment to a substr() was handed | |
646 | a NULL. | |
647 | ||
5f05dabc | 648 | =item Can't msgrcv to read-only var |
a0d0e21e | 649 | |
5f05dabc | 650 | (F) The target of a msgrcv must be modifiable to be used as a receive |
a0d0e21e LW |
651 | buffer. |
652 | ||
653 | =item Can't open %s: %s | |
654 | ||
54310121 | 655 | (S) An inplace edit couldn't open the original file for the indicated reason. |
a0d0e21e LW |
656 | Usually this is because you don't have read permission for the file. |
657 | ||
658 | =item Can't open bidirectional pipe | |
659 | ||
660 | (W) You tried to say C<open(CMD, "|cmd|")>, which is not supported. You can | |
661 | try any of several modules in the Perl library to do this, such as | |
7e1af8bc | 662 | IPC::Open2. Alternately, direct the pipe's output to a file using "E<gt>", |
a0d0e21e LW |
663 | and then read it in under a different file handle. |
664 | ||
748a9306 LW |
665 | =item Can't open error file %s as stderr |
666 | ||
667 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
8b1a09fc | 668 | couldn't open the file specified after '2E<gt>' or '2E<gt>E<gt>' on the |
669 | command line for writing. | |
748a9306 LW |
670 | |
671 | =item Can't open input file %s as stdin | |
672 | ||
673 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
8b1a09fc | 674 | couldn't open the file specified after 'E<lt>' on the command line for reading. |
748a9306 LW |
675 | |
676 | =item Can't open output file %s as stdout | |
677 | ||
678 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
8b1a09fc | 679 | couldn't open the file specified after 'E<gt>' or 'E<gt>E<gt>' on the command |
680 | line for writing. | |
748a9306 LW |
681 | |
682 | =item Can't open output pipe (name: %s) | |
683 | ||
684 | (P) An error peculiar to VMS. Perl does its own command line redirection, and | |
685 | couldn't open the pipe into which to send data destined for stdout. | |
686 | ||
a0d0e21e LW |
687 | =item Can't open perl script "%s": %s |
688 | ||
689 | (F) The script you specified can't be opened for the indicated reason. | |
690 | ||
691 | =item Can't rename %s to %s: %s, skipping file | |
692 | ||
693 | (S) The rename done by the B<-i> switch failed for some reason, probably because | |
694 | you don't have write permission to the directory. | |
695 | ||
748a9306 LW |
696 | =item Can't reopen input pipe (name: %s) in binary mode |
697 | ||
698 | (P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to | |
699 | reopen it to accept binary data. Alas, it failed. | |
700 | ||
a0d0e21e LW |
701 | =item Can't reswap uid and euid |
702 | ||
703 | (P) The setreuid() call failed for some reason in the setuid emulator | |
704 | of suidperl. | |
705 | ||
706 | =item Can't return outside a subroutine | |
707 | ||
708 | (F) The return statement was executed in mainline code, that is, where | |
709 | there was no subroutine call to return out of. See L<perlsub>. | |
710 | ||
711 | =item Can't stat script "%s" | |
712 | ||
713 | (P) For some reason you can't fstat() the script even though you have | |
714 | it open already. Bizarre. | |
715 | ||
716 | =item Can't swap uid and euid | |
717 | ||
718 | (P) The setreuid() call failed for some reason in the setuid emulator | |
719 | of suidperl. | |
720 | ||
721 | =item Can't take log of %g | |
722 | ||
5f05dabc | 723 | (F) Logarithms are defined on only positive real numbers. |
a0d0e21e LW |
724 | |
725 | =item Can't take sqrt of %g | |
726 | ||
727 | (F) For ordinary real numbers, you can't take the square root of a | |
728 | negative number. There's a Complex package available for Perl, though, | |
729 | if you really want to do that. | |
730 | ||
731 | =item Can't undef active subroutine | |
732 | ||
733 | (F) You can't undefine a routine that's currently running. You can, | |
734 | however, redefine it while it's running, and you can even undef the | |
735 | redefined subroutine while the old routine is running. Go figure. | |
736 | ||
737 | =item Can't unshift | |
738 | ||
739 | (F) You tried to unshift an "unreal" array that can't be unshifted, such | |
740 | as the main Perl stack. | |
741 | ||
742 | =item Can't upgrade that kind of scalar | |
743 | ||
744 | (P) The internal sv_upgrade routine adds "members" to an SV, making | |
745 | it into a more specialized kind of SV. The top several SV types are | |
746 | so specialized, however, that they cannot be interconverted. This | |
747 | message indicates that such a conversion was attempted. | |
748 | ||
749 | =item Can't upgrade to undef | |
750 | ||
751 | (P) The undefined SV is the bottom of the totem pole, in the scheme | |
752 | of upgradability. Upgrading to undef indicates an error in the | |
753 | code calling sv_upgrade. | |
754 | ||
c07a80fd | 755 | =item Can't use "my %s" in sort comparison |
756 | ||
757 | (F) The global variables $a and $b are reserved for sort comparisons. | |
8b1a09fc | 758 | You mentioned $a or $b in the same line as the E<lt>=E<gt> or cmp operator, |
c07a80fd | 759 | and the variable had earlier been declared as a lexical variable. |
760 | Either qualify the sort variable with the package name, or rename the | |
761 | lexical variable. | |
762 | ||
a0d0e21e LW |
763 | =item Can't use %s for loop variable |
764 | ||
765 | (F) Only a simple scalar variable may be used as a loop variable on a foreach. | |
766 | ||
767 | =item Can't use %s ref as %s ref | |
768 | ||
769 | (F) You've mixed up your reference types. You have to dereference a | |
770 | reference of the type needed. You can use the ref() function to | |
771 | test the type of the reference, if need be. | |
772 | ||
748a9306 LW |
773 | =item Can't use \1 to mean $1 in expression |
774 | ||
775 | (W) In an ordinary expression, backslash is a unary operator that creates | |
776 | a reference to its argument. The use of backslash to indicate a backreference | |
5f05dabc | 777 | to a matched substring is valid only as part of a regular expression pattern. |
748a9306 LW |
778 | Trying to do this in ordinary Perl code produces a value that prints |
779 | out looking like SCALAR(0xdecaf). Use the $1 form instead. | |
780 | ||
44a8e56a | 781 | =item Can't use bareword ("%s") as %s ref while \"strict refs\" in use |
782 | ||
783 | (F) Only hard references are allowed by "strict refs". Symbolic references | |
784 | are disallowed. See L<perlref>. | |
785 | ||
748a9306 | 786 | =item Can't use string ("%s") as %s ref while "strict refs" in use |
a0d0e21e LW |
787 | |
788 | (F) Only hard references are allowed by "strict refs". Symbolic references | |
789 | are disallowed. See L<perlref>. | |
790 | ||
791 | =item Can't use an undefined value as %s reference | |
792 | ||
793 | (F) A value used as either a hard reference or a symbolic reference must | |
54310121 | 794 | be a defined value. This helps to delurk some insidious errors. |
a0d0e21e | 795 | |
a0d0e21e LW |
796 | =item Can't use global %s in "my" |
797 | ||
798 | (F) You tried to declare a magical variable as a lexical variable. This is | |
5f05dabc | 799 | not allowed, because the magic can be tied to only one location (namely |
a0d0e21e LW |
800 | the global variable) and it would be incredibly confusing to have |
801 | variables in your program that looked like magical variables but | |
802 | weren't. | |
803 | ||
748a9306 LW |
804 | =item Can't use subscript on %s |
805 | ||
806 | (F) The compiler tried to interpret a bracketed expression as a | |
807 | subscript. But to the left of the brackets was an expression that | |
808 | didn't look like an array reference, or anything else subscriptable. | |
809 | ||
a0d0e21e LW |
810 | =item Can't write to temp file for B<-e>: %s |
811 | ||
812 | (F) The write routine failed for some reason while trying to process | |
813 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. | |
814 | ||
5f05dabc | 815 | =item Can't x= to read-only value |
a0d0e21e LW |
816 | |
817 | (F) You tried to repeat a constant value (often the undefined value) with | |
818 | an assignment operator, which implies modifying the value itself. | |
819 | Perhaps you need to copy the value to a temporary, and repeat that. | |
820 | ||
821 | =item Cannot open temporary file | |
822 | ||
8b1a09fc | 823 | (F) The create routine failed for some reason while trying to process |
a0d0e21e LW |
824 | a B<-e> switch. Maybe your /tmp partition is full, or clobbered. |
825 | ||
e7ea3e70 IZ |
826 | =item Cannot resolve method `%s' overloading `%s' in package `%s' |
827 | ||
828 | (F|P) Error resolving overloading specified by a method name (as | |
829 | opposed to a subroutine reference): no such method callable via the | |
830 | package. If method name is C<???>, this is an internal error. | |
831 | ||
a0d0e21e LW |
832 | =item chmod: mode argument is missing initial 0 |
833 | ||
834 | (W) A novice will sometimes say | |
835 | ||
836 | chmod 777, $filename | |
837 | ||
838 | not realizing that 777 will be interpreted as a decimal number, equivalent | |
839 | to 01411. Octal constants are introduced with a leading 0 in Perl, as in C. | |
840 | ||
8b1a09fc | 841 | =item Close on unopened file E<lt>%sE<gt> |
a0d0e21e LW |
842 | |
843 | (W) You tried to close a filehandle that was never opened. | |
844 | ||
7a2e2cd6 | 845 | =item Compilation failed in require |
846 | ||
847 | (F) Perl could not compile a file specified in a C<require> statement. | |
848 | Perl uses this generic message when none of the errors that it encountered | |
849 | were severe enough to halt compilation immediately. | |
850 | ||
a0d0e21e LW |
851 | =item connect() on closed fd |
852 | ||
853 | (W) You tried to do a connect on a closed socket. Did you forget to check | |
854 | the return value of your socket() call? See L<perlfunc/connect>. | |
855 | ||
4cee8e80 CS |
856 | =item Constant subroutine %s redefined |
857 | ||
858 | (S) You redefined a subroutine which had previously been eligible for | |
859 | inlining. See L<perlsub/"Constant Functions"> for commentary and | |
860 | workarounds. | |
861 | ||
9607fc9c | 862 | =item Constant subroutine %s undefined |
863 | ||
864 | (S) You undefined a subroutine which had previously been eligible for | |
865 | inlining. See L<perlsub/"Constant Functions"> for commentary and | |
866 | workarounds. | |
867 | ||
e7ea3e70 IZ |
868 | =item Copy method did not return a reference |
869 | ||
870 | (F) The method which overloads "=" is buggy. See L<overload/Copy Constructor>. | |
871 | ||
a0d0e21e LW |
872 | =item Corrupt malloc ptr 0x%lx at 0x%lx |
873 | ||
874 | (P) The malloc package that comes with Perl had an internal failure. | |
875 | ||
876 | =item corrupted regexp pointers | |
877 | ||
878 | (P) The regular expression engine got confused by what the regular | |
879 | expression compiler gave it. | |
880 | ||
881 | =item corrupted regexp program | |
882 | ||
883 | (P) The regular expression engine got passed a regexp program without | |
884 | a valid magic number. | |
885 | ||
886 | =item Deep recursion on subroutine "%s" | |
887 | ||
888 | (W) This subroutine has called itself (directly or indirectly) 100 | |
889 | times than it has returned. This probably indicates an infinite | |
890 | recursion, unless you're writing strange benchmark programs, in which | |
891 | case it indicates something else. | |
892 | ||
fc36a67e | 893 | =item Delimiter for here document is too long |
894 | ||
895 | (F) In a here document construct like C<E<lt>E<lt>FOO>, the label | |
896 | C<FOO> is too long for Perl to handle. You have to be seriously | |
897 | twisted to write code that triggers this error. | |
898 | ||
4633a7c4 LW |
899 | =item Did you mean &%s instead? |
900 | ||
901 | (W) You probably referred to an imported subroutine &FOO as $FOO or some such. | |
902 | ||
748a9306 | 903 | =item Did you mean $ or @ instead of %? |
a0d0e21e | 904 | |
748a9306 LW |
905 | (W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}. |
906 | On the other hand, maybe you just meant %hash and got carried away. | |
907 | ||
7e1af8bc | 908 | =item Died |
5f05dabc | 909 | |
910 | (F) You passed die() an empty string (the equivalent of C<die "">) or | |
911 | you called it with no args and both C<$@> and C<$_> were empty. | |
912 | ||
54310121 | 913 | =item Do you need to predeclare %s? |
748a9306 LW |
914 | |
915 | (S) This is an educated guess made in conjunction with the message "%s | |
916 | found where operator expected". It often means a subroutine or module | |
917 | name is being referenced that hasn't been declared yet. This may be | |
918 | because of ordering problems in your file, or because of a missing | |
919 | "sub", "package", "require", or "use" statement. If you're | |
920 | referencing something that isn't defined yet, you don't actually have | |
921 | to define the subroutine or package before the current location. You | |
922 | can use an empty "sub foo;" or "package FOO;" to enter a "forward" | |
923 | declaration. | |
a0d0e21e LW |
924 | |
925 | =item Don't know how to handle magic of type '%s' | |
926 | ||
927 | (P) The internal handling of magical variables has been cursed. | |
928 | ||
929 | =item do_study: out of memory | |
930 | ||
931 | (P) This should have been caught by safemalloc() instead. | |
932 | ||
933 | =item Duplicate free() ignored | |
934 | ||
935 | (S) An internal routine called free() on something that had already | |
936 | been freed. | |
937 | ||
4633a7c4 LW |
938 | =item elseif should be elsif |
939 | ||
940 | (S) There is no keyword "elseif" in Perl because Larry thinks it's | |
941 | ugly. Your code will be interpreted as an attempt to call a method | |
942 | named "elseif" for the class returned by the following block. This is | |
943 | unlikely to be what you want. | |
944 | ||
a0d0e21e LW |
945 | =item END failed--cleanup aborted |
946 | ||
947 | (F) An untrapped exception was raised while executing an END subroutine. | |
948 | The interpreter is immediately exited. | |
949 | ||
748a9306 LW |
950 | =item Error converting file specification %s |
951 | ||
5f05dabc | 952 | (F) An error peculiar to VMS. Because Perl may have to deal with file |
748a9306 LW |
953 | specifications in either VMS or Unix syntax, it converts them to a |
954 | single form when it must operate on them directly. Either you've | |
955 | passed an invalid file specification to Perl, or you've found a | |
956 | case the conversion routines don't handle. Drat. | |
957 | ||
fc36a67e | 958 | =item Excessively long <> operator |
959 | ||
960 | (F) The contents of a <> operator may not exceed the maximum size of a | |
961 | Perl identifier. If you're just trying to glob a long list of | |
962 | filenames, try using the glob() operator, or put the filenames into a | |
963 | variable and glob that. | |
964 | ||
f86702cc | 965 | =item Execution of %s aborted due to compilation errors |
a0d0e21e LW |
966 | |
967 | (F) The final summary message when a Perl compilation fails. | |
968 | ||
969 | =item Exiting eval via %s | |
970 | ||
8b1a09fc | 971 | (W) You are exiting an eval by unconventional means, such as |
a0d0e21e LW |
972 | a goto, or a loop control statement. |
973 | ||
0a753a76 | 974 | =item Exiting pseudo-block via %s |
975 | ||
976 | (W) You are exiting a rather special block construct (like a sort block or | |
977 | subroutine) by unconventional means, such as a goto, or a loop control | |
978 | statement. See L<perlfunc/sort>. | |
979 | ||
a0d0e21e LW |
980 | =item Exiting subroutine via %s |
981 | ||
8b1a09fc | 982 | (W) You are exiting a subroutine by unconventional means, such as |
a0d0e21e LW |
983 | a goto, or a loop control statement. |
984 | ||
985 | =item Exiting substitution via %s | |
986 | ||
8b1a09fc | 987 | (W) You are exiting a substitution by unconventional means, such as |
a0d0e21e LW |
988 | a return, a goto, or a loop control statement. |
989 | ||
748a9306 | 990 | =item Fatal VMS error at %s, line %d |
a0d0e21e | 991 | |
748a9306 LW |
992 | (P) An error peculiar to VMS. Something untoward happened in a VMS system |
993 | service or RTL routine; Perl's exit status should provide more details. The | |
994 | filename in "at %s" and the line number in "line %d" tell you which section of | |
995 | the Perl source code is distressed. | |
a0d0e21e LW |
996 | |
997 | =item fcntl is not implemented | |
998 | ||
999 | (F) Your machine apparently doesn't implement fcntl(). What is this, a | |
1000 | PDP-11 or something? | |
1001 | ||
1002 | =item Filehandle %s never opened | |
1003 | ||
1004 | (W) An I/O operation was attempted on a filehandle that was never initialized. | |
1005 | You need to do an open() or a socket() call, or call a constructor from | |
1006 | the FileHandle package. | |
1007 | ||
5f05dabc | 1008 | =item Filehandle %s opened for only input |
a0d0e21e LW |
1009 | |
1010 | (W) You tried to write on a read-only filehandle. If you | |
1011 | intended it to be a read-write filehandle, you needed to open it with | |
8b1a09fc | 1012 | "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If |
5f05dabc | 1013 | you intended only to write the file, use "E<gt>" or "E<gt>E<gt>". See |
8b1a09fc | 1014 | L<perlfunc/open>. |
a0d0e21e | 1015 | |
5f05dabc | 1016 | =item Filehandle opened for only input |
a0d0e21e LW |
1017 | |
1018 | (W) You tried to write on a read-only filehandle. If you | |
1019 | intended it to be a read-write filehandle, you needed to open it with | |
8b1a09fc | 1020 | "+E<lt>" or "+E<gt>" or "+E<gt>E<gt>" instead of with "E<lt>" or nothing. If |
5f05dabc | 1021 | you intended only to write the file, use "E<gt>" or "E<gt>E<gt>". See |
8b1a09fc | 1022 | L<perlfunc/open>. |
a0d0e21e LW |
1023 | |
1024 | =item Final $ should be \$ or $name | |
1025 | ||
1026 | (F) You must now decide whether the final $ in a string was meant to be | |
1027 | a literal dollar sign, or was meant to introduce a variable name | |
1028 | that happens to be missing. So you have to put either the backslash or | |
1029 | the name. | |
1030 | ||
1031 | =item Final @ should be \@ or @name | |
1032 | ||
1033 | (F) You must now decide whether the final @ in a string was meant to be | |
1034 | a literal "at" sign, or was meant to introduce a variable name | |
1035 | that happens to be missing. So you have to put either the backslash or | |
1036 | the name. | |
1037 | ||
1038 | =item Format %s redefined | |
1039 | ||
1040 | (W) You redefined a format. To suppress this warning, say | |
1041 | ||
1042 | { | |
1043 | local $^W = 0; | |
1044 | eval "format NAME =..."; | |
1045 | } | |
1046 | ||
1047 | =item Format not terminated | |
1048 | ||
1049 | (F) A format must be terminated by a line with a solitary dot. Perl got | |
1050 | to the end of your file without finding such a line. | |
1051 | ||
1052 | =item Found = in conditional, should be == | |
1053 | ||
1054 | (W) You said | |
1055 | ||
1056 | if ($foo = 123) | |
1057 | ||
1058 | when you meant | |
1059 | ||
1060 | if ($foo == 123) | |
1061 | ||
1062 | (or something like that). | |
1063 | ||
1064 | =item gdbm store returned %d, errno %d, key "%s" | |
1065 | ||
1066 | (S) A warning from the GDBM_File extension that a store failed. | |
1067 | ||
1068 | =item gethostent not implemented | |
1069 | ||
1070 | (F) Your C library apparently doesn't implement gethostent(), probably | |
1071 | because if it did, it'd feel morally obligated to return every hostname | |
1072 | on the Internet. | |
1073 | ||
1074 | =item get{sock,peer}name() on closed fd | |
1075 | ||
1076 | (W) You tried to get a socket or peer socket name on a closed socket. | |
1077 | Did you forget to check the return value of your socket() call? | |
1078 | ||
748a9306 LW |
1079 | =item getpwnam returned invalid UIC %#o for user "%s" |
1080 | ||
1081 | (S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the | |
1082 | C<getpwnam> operator returned an invalid UIC. | |
1083 | ||
1084 | ||
a0d0e21e LW |
1085 | =item Glob not terminated |
1086 | ||
1087 | (F) The lexer saw a left angle bracket in a place where it was expecting | |
1088 | a term, so it's looking for the corresponding right angle bracket, and not | |
1089 | finding it. Chances are you left some needed parentheses out earlier in | |
1090 | the line, and you really meant a "less than". | |
1091 | ||
1092 | =item Global symbol "%s" requires explicit package name | |
1093 | ||
68dc0745 | 1094 | (F) You've said "use strict vars", which indicates that all variables |
1095 | must either be lexically scoped (using "my"), or explicitly qualified to | |
a0d0e21e LW |
1096 | say which package the global variable is in (using "::"). |
1097 | ||
1098 | =item goto must have label | |
1099 | ||
1100 | (F) Unlike with "next" or "last", you're not allowed to goto an | |
1101 | unspecified destination. See L<perlfunc/goto>. | |
1102 | ||
1103 | =item Had to create %s unexpectedly | |
1104 | ||
1105 | (S) A routine asked for a symbol from a symbol table that ought to have | |
1106 | existed already, but for some reason it didn't, and had to be created on | |
1107 | an emergency basis to prevent a core dump. | |
1108 | ||
1109 | =item Hash %%s missing the % in argument %d of %s() | |
1110 | ||
1111 | (D) Really old Perl let you omit the % on hash names in some spots. This | |
1112 | is now heavily deprecated. | |
1113 | ||
8903cb82 | 1114 | =item Identifier too long |
1115 | ||
1116 | (F) Perl limits identifiers (names for variables, functions, etc.) to | |
fc36a67e | 1117 | about 250 characters for simple names, and somewhat more for compound |
1118 | names (like C<$A::B>). You've exceeded Perl's limits. Future | |
1119 | versions of Perl are likely to eliminate these arbitrary limitations. | |
8903cb82 | 1120 | |
8b1a09fc | 1121 | =item Ill-formed logical name |%s| in prime_env_iter |
a0d0e21e | 1122 | |
8b1a09fc | 1123 | (W) A warning peculiar to VMS. A logical name was encountered when preparing |
1124 | to iterate over %ENV which violates the syntactic rules governing logical | |
5f05dabc | 1125 | names. Because it cannot be translated normally, it is skipped, and will not |
1126 | appear in %ENV. This may be a benign occurrence, as some software packages | |
54310121 | 1127 | might directly modify logical name tables and introduce nonstandard names, |
8b1a09fc | 1128 | or it may indicate that a logical name table has been corrupted. |
a0d0e21e | 1129 | |
4fdae800 | 1130 | =item Illegal character %s (carriage return) |
1131 | ||
1132 | (F) A carriage return character was found in the input. This is an | |
1133 | error, and not a warning, because carriage return characters can break | |
54310121 | 1134 | multi-line strings, including here documents (e.g., C<print E<lt>E<lt>EOF;>). |
1135 | ||
1136 | Under Unix, this error is usually caused by executing Perl code -- | |
68dc0745 | 1137 | either the main program, a module, or an eval'd string -- that was |
54310121 | 1138 | transferred over a network connection from a non-Unix system without |
68dc0745 | 1139 | properly converting the text file format. |
1140 | ||
1141 | Under systems that use something other than '\n' to delimit lines of | |
1142 | text, this error can also be caused by reading Perl code from a file | |
1143 | handle that is in binary mode (as set by the C<binmode> operator). | |
1144 | ||
1145 | In either case, the Perl code in question will probably need to be | |
1146 | converted with something like C<s/\x0D\x0A?/\n/g> before it can be | |
1147 | executed. | |
4fdae800 | 1148 | |
a0d0e21e LW |
1149 | =item Illegal division by zero |
1150 | ||
1151 | (F) You tried to divide a number by 0. Either something was wrong in your | |
1152 | logic, or you need to put a conditional in to guard against meaningless input. | |
1153 | ||
1154 | =item Illegal modulus zero | |
1155 | ||
1156 | (F) You tried to divide a number by 0 to get the remainder. Most numbers | |
1157 | don't take to this kindly. | |
1158 | ||
1159 | =item Illegal octal digit | |
1160 | ||
1161 | (F) You used an 8 or 9 in a octal number. | |
1162 | ||
748a9306 LW |
1163 | =item Illegal octal digit ignored |
1164 | ||
1165 | (W) You may have tried to use an 8 or 9 in a octal number. Interpretation | |
1166 | of the octal number stopped before the 8 or 9. | |
1167 | ||
54310121 | 1168 | =item Illegal switch in PERL5OPT: %s |
1169 | ||
1170 | (X) The PERL5OPT environment variable may only be used to set the | |
1171 | following switches: B<-[DIMUdmw]>. | |
1172 | ||
9607fc9c | 1173 | =item In string, @%s now must be written as \@%s |
1174 | ||
1175 | (F) It used to be that Perl would try to guess whether you wanted an | |
1176 | array interpolated or a literal @. It did this when the string was first | |
1177 | used at runtime. Now strings are parsed at compile time, and ambiguous | |
1178 | instances of @ must be disambiguated, either by prepending a backslash to | |
1179 | indicate a literal, or by declaring (or using) the array within the | |
1180 | program before the string (lexically). (Someday it will simply assume | |
1181 | that an unbackslashed @ interpolates an array.) | |
1182 | ||
a0d0e21e LW |
1183 | =item Insecure dependency in %s |
1184 | ||
8b1a09fc | 1185 | (F) You tried to do something that the tainting mechanism didn't like. |
a0d0e21e LW |
1186 | The tainting mechanism is turned on when you're running setuid or setgid, |
1187 | or when you specify B<-T> to turn it on explicitly. The tainting mechanism | |
1188 | labels all data that's derived directly or indirectly from the user, | |
1189 | who is considered to be unworthy of your trust. If any such data is | |
1190 | used in a "dangerous" operation, you get this error. See L<perlsec> | |
1191 | for more information. | |
1192 | ||
1193 | =item Insecure directory in %s | |
1194 | ||
1195 | (F) You can't use system(), exec(), or a piped open in a setuid or setgid | |
8b1a09fc | 1196 | script if C<$ENV{PATH}> contains a directory that is writable by the world. |
a0d0e21e LW |
1197 | See L<perlsec>. |
1198 | ||
1199 | =item Insecure PATH | |
1200 | ||
1201 | (F) You can't use system(), exec(), or a piped open in a setuid or | |
8b1a09fc | 1202 | setgid script if C<$ENV{PATH}> is derived from data supplied (or |
a0d0e21e LW |
1203 | potentially supplied) by the user. The script must set the path to a |
1204 | known value, using trustworthy data. See L<perlsec>. | |
1205 | ||
bbce6d69 | 1206 | =item Integer overflow in hex number |
1207 | ||
1208 | (S) The literal hex number you have specified is too big for your | |
1209 | architecture. On a 32-bit architecture the largest hex literal is | |
1210 | 0xFFFFFFFF. | |
1211 | ||
1212 | =item Integer overflow in octal number | |
1213 | ||
1214 | (S) The literal octal number you have specified is too big for your | |
1215 | architecture. On a 32-bit architecture the largest octal literal is | |
1216 | 037777777777. | |
1217 | ||
748a9306 LW |
1218 | =item Internal inconsistency in tracking vforks |
1219 | ||
1220 | (S) A warning peculiar to VMS. Perl keeps track of the number | |
5f05dabc | 1221 | of times you've called C<fork> and C<exec>, to determine |
2ba9eb46 | 1222 | whether the current call to C<exec> should affect the current |
748a9306 LW |
1223 | script or a subprocess (see L<perlvms/exec>). Somehow, this count |
1224 | has become scrambled, so Perl is making a guess and treating | |
1225 | this C<exec> as a request to terminate the Perl script | |
1226 | and execute the specified command. | |
1227 | ||
a0d0e21e LW |
1228 | =item internal disaster in regexp |
1229 | ||
1230 | (P) Something went badly wrong in the regular expression parser. | |
1231 | ||
5cd24f17 | 1232 | =item internal error: glob failed |
1233 | ||
1234 | (P) Something went wrong with the external program(s) used for C<glob> | |
1235 | and C<E<lt>*.cE<gt>>. This may mean that your csh (C shell) is | |
1236 | broken. If so, you should change all of the csh-related variables in | |
1237 | config.sh: If you have tcsh, make the variables refer to it as if it | |
1238 | were csh (e.g. C<full_csh='/usr/bin/tcsh'>); otherwise, make them all | |
1239 | empty (except that C<d_csh> should be C<'undef'>) so that Perl will | |
1240 | think csh is missing. In either case, after editing config.sh, run | |
1241 | C<./Configure -S> and rebuild Perl. | |
1242 | ||
a0d0e21e LW |
1243 | =item internal urp in regexp at /%s/ |
1244 | ||
1245 | (P) Something went badly awry in the regular expression parser. | |
1246 | ||
1247 | =item invalid [] range in regexp | |
1248 | ||
1249 | (F) The range specified in a character class had a minimum character | |
1250 | greater than the maximum character. See L<perlre>. | |
1251 | ||
96e4d5b1 | 1252 | =item Invalid type in pack: '%s' |
1253 | ||
8903cb82 | 1254 | (F) The given character is not a valid pack type. See L<perlfunc/pack>. |
96e4d5b1 | 1255 | |
1256 | =item Invalid type in unpack: '%s' | |
1257 | ||
8903cb82 | 1258 | (F) The given character is not a valid unpack type. See L<perlfunc/unpack>. |
96e4d5b1 | 1259 | |
a0d0e21e LW |
1260 | =item ioctl is not implemented |
1261 | ||
1262 | (F) Your machine apparently doesn't implement ioctl(), which is pretty | |
1263 | strange for a machine that supports C. | |
1264 | ||
1265 | =item junk on end of regexp | |
1266 | ||
1267 | (P) The regular expression parser is confused. | |
1268 | ||
1269 | =item Label not found for "last %s" | |
1270 | ||
1271 | (F) You named a loop to break out of, but you're not currently in a | |
1272 | loop of that name, not even if you count where you were called from. | |
1273 | See L<perlfunc/last>. | |
1274 | ||
1275 | =item Label not found for "next %s" | |
1276 | ||
1277 | (F) You named a loop to continue, but you're not currently in a loop of | |
1278 | that name, not even if you count where you were called from. See | |
1279 | L<perlfunc/last>. | |
1280 | ||
1281 | =item Label not found for "redo %s" | |
1282 | ||
1283 | (F) You named a loop to restart, but you're not currently in a loop of | |
1284 | that name, not even if you count where you were called from. See | |
1285 | L<perlfunc/last>. | |
1286 | ||
1287 | =item listen() on closed fd | |
1288 | ||
1289 | (W) You tried to do a listen on a closed socket. Did you forget to check | |
1290 | the return value of your socket() call? See L<perlfunc/listen>. | |
1291 | ||
a0d0e21e LW |
1292 | =item Method for operation %s not found in package %s during blessing |
1293 | ||
1294 | (F) An attempt was made to specify an entry in an overloading table that | |
e7ea3e70 | 1295 | doesn't resolve to a valid subroutine. See L<overload>. |
a0d0e21e LW |
1296 | |
1297 | =item Might be a runaway multi-line %s string starting on line %d | |
1298 | ||
1299 | (S) An advisory indicating that the previous error may have been caused | |
1300 | by a missing delimiter on a string or pattern, because it eventually | |
1301 | ended earlier on the current line. | |
1302 | ||
1303 | =item Misplaced _ in number | |
1304 | ||
1305 | (W) An underline in a decimal constant wasn't on a 3-digit boundary. | |
1306 | ||
1307 | =item Missing $ on loop variable | |
1308 | ||
8b1a09fc | 1309 | (F) Apparently you've been programming in B<csh> too much. Variables are always |
1310 | mentioned with the $ in Perl, unlike in the shells, where it can vary from | |
a0d0e21e LW |
1311 | one line to the next. |
1312 | ||
1313 | =item Missing comma after first argument to %s function | |
1314 | ||
1315 | (F) While certain functions allow you to specify a filehandle or an | |
1316 | "indirect object" before the argument list, this ain't one of them. | |
1317 | ||
748a9306 LW |
1318 | =item Missing operator before %s? |
1319 | ||
1320 | (S) This is an educated guess made in conjunction with the message "%s | |
1321 | found where operator expected". Often the missing operator is a comma. | |
1322 | ||
a0d0e21e LW |
1323 | =item Missing right bracket |
1324 | ||
1325 | (F) The lexer counted more opening curly brackets (braces) than closing ones. | |
1326 | As a general rule, you'll find it's missing near the place you were last | |
1327 | editing. | |
1328 | ||
1329 | =item Missing semicolon on previous line? | |
1330 | ||
1331 | (S) This is an educated guess made in conjunction with the message "%s | |
1332 | found where operator expected". Don't automatically put a semicolon on | |
1333 | the previous line just because you saw this message. | |
1334 | ||
1335 | =item Modification of a read-only value attempted | |
1336 | ||
1337 | (F) You tried, directly or indirectly, to change the value of a | |
5f05dabc | 1338 | constant. You didn't, of course, try "2 = 1", because the compiler |
a0d0e21e LW |
1339 | catches that. But an easy way to do the same thing is: |
1340 | ||
1341 | sub mod { $_[0] = 1 } | |
1342 | mod(2); | |
1343 | ||
1344 | Another way is to assign to a substr() that's off the end of the string. | |
1345 | ||
54310121 | 1346 | =item Modification of noncreatable array value attempted, subscript %d |
a0d0e21e LW |
1347 | |
1348 | (F) You tried to make an array value spring into existence, and the | |
1349 | subscript was probably negative, even counting from end of the array | |
1350 | backwards. | |
1351 | ||
54310121 | 1352 | =item Modification of noncreatable hash value attempted, subscript "%s" |
a0d0e21e LW |
1353 | |
1354 | (F) You tried to make a hash value spring into existence, and it couldn't | |
1355 | be created for some peculiar reason. | |
1356 | ||
1357 | =item Module name must be constant | |
1358 | ||
1359 | (F) Only a bare module name is allowed as the first argument to a "use". | |
1360 | ||
1361 | =item msg%s not implemented | |
1362 | ||
1363 | (F) You don't have System V message IPC on your system. | |
1364 | ||
1365 | =item Multidimensional syntax %s not supported | |
1366 | ||
8b1a09fc | 1367 | (W) Multidimensional arrays aren't written like C<$foo[1,2,3]>. They're written |
1368 | like C<$foo[1][2][3]>, as in C. | |
1369 | ||
1370 | =item Name "%s::%s" used only once: possible typo | |
1371 | ||
68dc0745 | 1372 | (W) Typographical errors often show up as unique variable names. |
1373 | If you had a good reason for having a unique name, then just mention | |
1374 | it again somehow to suppress the message. The C<use vars> pragma is | |
1375 | provided for just this purpose. | |
a0d0e21e LW |
1376 | |
1377 | =item Negative length | |
1378 | ||
1379 | (F) You tried to do a read/write/send/recv operation with a buffer length | |
1380 | that is less than 0. This is difficult to imagine. | |
1381 | ||
1382 | =item nested *?+ in regexp | |
1383 | ||
5f05dabc | 1384 | (F) You can't quantify a quantifier without intervening parentheses. So |
a0d0e21e LW |
1385 | things like ** or +* or ?* are illegal. |
1386 | ||
5f05dabc | 1387 | Note, however, that the minimal matching quantifiers, C<*?>, C<+?>, and C<??> appear |
a0d0e21e LW |
1388 | to be nested quantifiers, but aren't. See L<perlre>. |
1389 | ||
1390 | =item No #! line | |
1391 | ||
1392 | (F) The setuid emulator requires that scripts have a well-formed #! line | |
1393 | even on machines that don't support the #! construct. | |
1394 | ||
1395 | =item No %s allowed while running setuid | |
1396 | ||
1397 | (F) Certain operations are deemed to be too insecure for a setuid or setgid | |
1398 | script to even be allowed to attempt. Generally speaking there will be | |
1399 | another way to do what you want that is, if not secure, at least securable. | |
1400 | See L<perlsec>. | |
1401 | ||
1402 | =item No B<-e> allowed in setuid scripts | |
1403 | ||
1404 | (F) A setuid script can't be specified by the user. | |
1405 | ||
1406 | =item No comma allowed after %s | |
1407 | ||
1408 | (F) A list operator that has a filehandle or "indirect object" is not | |
1409 | allowed to have a comma between that and the following arguments. | |
1410 | Otherwise it'd be just another one of the arguments. | |
1411 | ||
0a753a76 | 1412 | One possible cause for this is that you expected to have imported a |
1413 | constant to your name space with B<use> or B<import> while no such | |
1414 | importing took place, it may for example be that your operating system | |
1415 | does not support that particular constant. Hopefully you did use an | |
1416 | explicit import list for the constants you expect to see, please see | |
1417 | L<perlfunc/use> and L<perlfunc/import>. While an explicit import list | |
1418 | would probably have caught this error earlier it naturally does not | |
1419 | remedy the fact that your operating system still does not support that | |
1420 | constant. Maybe you have a typo in the constants of the symbol import | |
1421 | list of B<use> or B<import> or in the constant name at the line where | |
1422 | this error was triggered? | |
1423 | ||
748a9306 LW |
1424 | =item No command into which to pipe on command line |
1425 | ||
1426 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
54310121 | 1427 | and found a '|' at the end of the command line, so it doesn't know where you |
748a9306 LW |
1428 | want to pipe the output from this command. |
1429 | ||
a0d0e21e LW |
1430 | =item No DB::DB routine defined |
1431 | ||
1432 | (F) The currently executing code was compiled with the B<-d> switch, | |
1433 | but for some reason the perl5db.pl file (or some facsimile thereof) | |
1434 | didn't define a routine to be called at the beginning of each | |
1435 | statement. Which is odd, because the file should have been required | |
1436 | automatically, and should have blown up the require if it didn't parse | |
1437 | right. | |
1438 | ||
1439 | =item No dbm on this machine | |
1440 | ||
1441 | (P) This is counted as an internal error, because every machine should | |
5f05dabc | 1442 | supply dbm nowadays, because Perl comes with SDBM. See L<SDBM_File>. |
a0d0e21e LW |
1443 | |
1444 | =item No DBsub routine | |
1445 | ||
1446 | (F) The currently executing code was compiled with the B<-d> switch, | |
1447 | but for some reason the perl5db.pl file (or some facsimile thereof) | |
1448 | didn't define a DB::sub routine to be called at the beginning of each | |
1449 | ordinary subroutine call. | |
1450 | ||
8b1a09fc | 1451 | =item No error file after 2E<gt> or 2E<gt>E<gt> on command line |
748a9306 LW |
1452 | |
1453 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1454 | and found a '2E<gt>' or a '2E<gt>E<gt>' on the command line, but can't find |
1455 | the name of the file to which to write data destined for stderr. | |
748a9306 | 1456 | |
8b1a09fc | 1457 | =item No input file after E<lt> on command line |
748a9306 LW |
1458 | |
1459 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1460 | and found a 'E<lt>' on the command line, but can't find the name of the file |
1461 | from which to read data for stdin. | |
748a9306 | 1462 | |
8b1a09fc | 1463 | =item No output file after E<gt> on command line |
748a9306 LW |
1464 | |
1465 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1466 | and found a lone 'E<gt>' at the end of the command line, so it doesn't know |
54310121 | 1467 | where you wanted to redirect stdout. |
748a9306 | 1468 | |
8b1a09fc | 1469 | =item No output file after E<gt> or E<gt>E<gt> on command line |
748a9306 LW |
1470 | |
1471 | (F) An error peculiar to VMS. Perl handles its own command line redirection, | |
8b1a09fc | 1472 | and found a 'E<gt>' or a 'E<gt>E<gt>' on the command line, but can't find the |
1473 | name of the file to which to write data destined for stdout. | |
748a9306 | 1474 | |
a0d0e21e LW |
1475 | =item No Perl script found in input |
1476 | ||
1477 | (F) You called C<perl -x>, but no line was found in the file beginning | |
1478 | with #! and containing the word "perl". | |
1479 | ||
1480 | =item No setregid available | |
1481 | ||
1482 | (F) Configure didn't find anything resembling the setregid() call for | |
1483 | your system. | |
1484 | ||
1485 | =item No setreuid available | |
1486 | ||
1487 | (F) Configure didn't find anything resembling the setreuid() call for | |
1488 | your system. | |
1489 | ||
1490 | =item No space allowed after B<-I> | |
1491 | ||
1492 | (F) The argument to B<-I> must follow the B<-I> immediately with no | |
1493 | intervening space. | |
1494 | ||
748a9306 LW |
1495 | =item No such pipe open |
1496 | ||
1497 | (P) An error peculiar to VMS. The internal routine my_pclose() tried to | |
1498 | close a pipe which hadn't been opened. This should have been caught earlier as | |
1499 | an attempt to close an unopened filehandle. | |
1500 | ||
a0d0e21e LW |
1501 | =item No such signal: SIG%s |
1502 | ||
1503 | (W) You specified a signal name as a subscript to %SIG that was not recognized. | |
1504 | Say C<kill -l> in your shell to see the valid signal names on your system. | |
1505 | ||
1506 | =item Not a CODE reference | |
1507 | ||
1508 | (F) Perl was trying to evaluate a reference to a code value (that is, a | |
1509 | subroutine), but found a reference to something else instead. You can | |
1510 | use the ref() function to find out what kind of ref it really was. | |
1511 | See also L<perlref>. | |
1512 | ||
1513 | =item Not a format reference | |
1514 | ||
1515 | (F) I'm not sure how you managed to generate a reference to an anonymous | |
1516 | format, but this indicates you did, and that it didn't exist. | |
1517 | ||
1518 | =item Not a GLOB reference | |
1519 | ||
55497cff | 1520 | (F) Perl was trying to evaluate a reference to a "typeglob" (that is, |
a0d0e21e LW |
1521 | a symbol table entry that looks like C<*foo>), but found a reference to |
1522 | something else instead. You can use the ref() function to find out | |
1523 | what kind of ref it really was. See L<perlref>. | |
1524 | ||
1525 | =item Not a HASH reference | |
1526 | ||
1527 | (F) Perl was trying to evaluate a reference to a hash value, but | |
1528 | found a reference to something else instead. You can use the ref() | |
1529 | function to find out what kind of ref it really was. See L<perlref>. | |
1530 | ||
1531 | =item Not a perl script | |
1532 | ||
1533 | (F) The setuid emulator requires that scripts have a well-formed #! line | |
1534 | even on machines that don't support the #! construct. The line must | |
1535 | mention perl. | |
1536 | ||
1537 | =item Not a SCALAR reference | |
1538 | ||
1539 | (F) Perl was trying to evaluate a reference to a scalar value, but | |
1540 | found a reference to something else instead. You can use the ref() | |
1541 | function to find out what kind of ref it really was. See L<perlref>. | |
1542 | ||
1543 | =item Not a subroutine reference | |
1544 | ||
1545 | (F) Perl was trying to evaluate a reference to a code value (that is, a | |
1546 | subroutine), but found a reference to something else instead. You can | |
1547 | use the ref() function to find out what kind of ref it really was. | |
1548 | See also L<perlref>. | |
1549 | ||
e7ea3e70 | 1550 | =item Not a subroutine reference in overload table |
a0d0e21e LW |
1551 | |
1552 | (F) An attempt was made to specify an entry in an overloading table that | |
8b1a09fc | 1553 | doesn't somehow point to a valid subroutine. See L<overload>. |
a0d0e21e LW |
1554 | |
1555 | =item Not an ARRAY reference | |
1556 | ||
1557 | (F) Perl was trying to evaluate a reference to an array value, but | |
1558 | found a reference to something else instead. You can use the ref() | |
1559 | function to find out what kind of ref it really was. See L<perlref>. | |
1560 | ||
1561 | =item Not enough arguments for %s | |
1562 | ||
1563 | (F) The function requires more arguments than you specified. | |
1564 | ||
1565 | =item Not enough format arguments | |
1566 | ||
1567 | (W) A format specified more picture fields than the next line supplied. | |
1568 | See L<perlform>. | |
1569 | ||
1570 | =item Null filename used | |
1571 | ||
5f05dabc | 1572 | (F) You can't require the null filename, especially because on many machines |
a0d0e21e LW |
1573 | that means the current directory! See L<perlfunc/require>. |
1574 | ||
55497cff | 1575 | =item Null picture in formline |
1576 | ||
1577 | (F) The first argument to formline must be a valid format picture | |
1578 | specification. It was found to be empty, which probably means you | |
1579 | supplied it an uninitialized value. See L<perlform>. | |
1580 | ||
a0d0e21e LW |
1581 | =item NULL OP IN RUN |
1582 | ||
1583 | (P) Some internal routine called run() with a null opcode pointer. | |
1584 | ||
1585 | =item Null realloc | |
1586 | ||
1587 | (P) An attempt was made to realloc NULL. | |
1588 | ||
1589 | =item NULL regexp argument | |
1590 | ||
5f05dabc | 1591 | (P) The internal pattern matching routines blew it big time. |
a0d0e21e LW |
1592 | |
1593 | =item NULL regexp parameter | |
1594 | ||
1595 | (P) The internal pattern matching routines are out of their gourd. | |
1596 | ||
fc36a67e | 1597 | =item Number too long |
1598 | ||
1599 | (F) Perl limits the representation of decimal numbers in programs to about | |
1600 | about 250 characters. You've exceeded that length. Future versions of | |
1601 | Perl are likely to eliminate this arbitrary limitation. In the meantime, | |
1602 | try using scientific notation (e.g. "1e6" instead of "1_000_000"). | |
1603 | ||
a0d0e21e LW |
1604 | =item Odd number of elements in hash list |
1605 | ||
1606 | (S) You specified an odd number of elements to a hash list, which is odd, | |
5f05dabc | 1607 | because hash lists come in key/value pairs. |
a0d0e21e | 1608 | |
bbce6d69 | 1609 | =item Offset outside string |
1610 | ||
1611 | (F) You tried to do a read/write/send/recv operation with an offset | |
1612 | pointing outside the buffer. This is difficult to imagine. | |
1613 | The sole exception to this is that C<sysread()>ing past the buffer | |
1614 | will extend the buffer and zero pad the new area. | |
1615 | ||
a0d0e21e LW |
1616 | =item oops: oopsAV |
1617 | ||
1618 | (S) An internal warning that the grammar is screwed up. | |
1619 | ||
1620 | =item oops: oopsHV | |
1621 | ||
1622 | (S) An internal warning that the grammar is screwed up. | |
1623 | ||
e7ea3e70 | 1624 | =item Operation `%s': no method found,%s |
44a8e56a | 1625 | |
e7ea3e70 IZ |
1626 | (F) An attempt was made to perform an overloaded operation for which |
1627 | no handler was defined. While some handlers can be autogenerated in | |
1628 | terms of other handlers, there is no default handler for any | |
1629 | operation, unless C<fallback> overloading key is specified to be | |
1630 | true. See L<overload>. | |
44a8e56a | 1631 | |
748a9306 LW |
1632 | =item Operator or semicolon missing before %s |
1633 | ||
1634 | (S) You used a variable or subroutine call where the parser was | |
1635 | expecting an operator. The parser has assumed you really meant | |
1636 | to use an operator, but this is highly likely to be incorrect. | |
1637 | For example, if you say "*foo *foo" it will be interpreted as | |
1638 | if you said "*foo * 'foo'". | |
1639 | ||
a0d0e21e LW |
1640 | =item Out of memory for yacc stack |
1641 | ||
1642 | (F) The yacc parser wanted to grow its stack so it could continue parsing, | |
1643 | but realloc() wouldn't give it more memory, virtual or otherwise. | |
1644 | ||
1645 | =item Out of memory! | |
1646 | ||
55497cff | 1647 | (X|F) The malloc() function returned 0, indicating there was insufficient |
54310121 | 1648 | remaining memory (or virtual memory) to satisfy the request. |
eff9c6e2 CS |
1649 | |
1650 | The request was judged to be small, so the possibility to trap it | |
1651 | depends on the way perl was compiled. By default it is not trappable. | |
1652 | However, if compiled for this, Perl may use the contents of C<$^M> as | |
1653 | an emergency pool after die()ing with this message. In this case the | |
55497cff | 1654 | error is trappable I<once>. |
1655 | ||
1656 | =item Out of memory during request for %s | |
1657 | ||
1658 | (F) The malloc() function returned 0, indicating there was insufficient | |
1659 | remaining memory (or virtual memory) to satisfy the request. However, | |
1660 | the request was judged large enough (compile-time default is 64K), so | |
1661 | a possibility to shut down by trapping this error is granted. | |
1662 | ||
a0d0e21e LW |
1663 | =item page overflow |
1664 | ||
1665 | (W) A single call to write() produced more lines than can fit on a page. | |
1666 | See L<perlform>. | |
1667 | ||
1668 | =item panic: ck_grep | |
1669 | ||
1670 | (P) Failed an internal consistency check trying to compile a grep. | |
1671 | ||
1672 | =item panic: ck_split | |
1673 | ||
1674 | (P) Failed an internal consistency check trying to compile a split. | |
1675 | ||
1676 | =item panic: corrupt saved stack index | |
1677 | ||
1678 | (P) The savestack was requested to restore more localized values than there | |
1679 | are in the savestack. | |
1680 | ||
1681 | =item panic: die %s | |
1682 | ||
1683 | (P) We popped the context stack to an eval context, and then discovered | |
1684 | it wasn't an eval context. | |
1685 | ||
1686 | =item panic: do_match | |
1687 | ||
1688 | (P) The internal pp_match() routine was called with invalid operational data. | |
1689 | ||
1690 | =item panic: do_split | |
1691 | ||
1692 | (P) Something terrible went wrong in setting up for the split. | |
1693 | ||
1694 | =item panic: do_subst | |
1695 | ||
1696 | (P) The internal pp_subst() routine was called with invalid operational data. | |
1697 | ||
1698 | =item panic: do_trans | |
1699 | ||
1700 | (P) The internal do_trans() routine was called with invalid operational data. | |
1701 | ||
1702 | =item panic: goto | |
1703 | ||
1704 | (P) We popped the context stack to a context with the specified label, | |
1705 | and then discovered it wasn't a context we know how to do a goto in. | |
1706 | ||
1707 | =item panic: INTERPCASEMOD | |
1708 | ||
1709 | (P) The lexer got into a bad state at a case modifier. | |
1710 | ||
1711 | =item panic: INTERPCONCAT | |
1712 | ||
1713 | (P) The lexer got into a bad state parsing a string with brackets. | |
1714 | ||
1715 | =item panic: last | |
1716 | ||
1717 | (P) We popped the context stack to a block context, and then discovered | |
1718 | it wasn't a block context. | |
1719 | ||
1720 | =item panic: leave_scope clearsv | |
1721 | ||
5f05dabc | 1722 | (P) A writable lexical variable became read-only somehow within the scope. |
a0d0e21e LW |
1723 | |
1724 | =item panic: leave_scope inconsistency | |
1725 | ||
1726 | (P) The savestack probably got out of sync. At least, there was an | |
1727 | invalid enum on the top of it. | |
1728 | ||
1729 | =item panic: malloc | |
1730 | ||
1731 | (P) Something requested a negative number of bytes of malloc. | |
1732 | ||
1733 | =item panic: mapstart | |
1734 | ||
1735 | (P) The compiler is screwed up with respect to the map() function. | |
1736 | ||
1737 | =item panic: null array | |
1738 | ||
1739 | (P) One of the internal array routines was passed a null AV pointer. | |
1740 | ||
1741 | =item panic: pad_alloc | |
1742 | ||
1743 | (P) The compiler got confused about which scratch pad it was allocating | |
1744 | and freeing temporaries and lexicals from. | |
1745 | ||
1746 | =item panic: pad_free curpad | |
1747 | ||
1748 | (P) The compiler got confused about which scratch pad it was allocating | |
1749 | and freeing temporaries and lexicals from. | |
1750 | ||
1751 | =item panic: pad_free po | |
1752 | ||
1753 | (P) An invalid scratch pad offset was detected internally. | |
1754 | ||
1755 | =item panic: pad_reset curpad | |
1756 | ||
1757 | (P) The compiler got confused about which scratch pad it was allocating | |
1758 | and freeing temporaries and lexicals from. | |
1759 | ||
1760 | =item panic: pad_sv po | |
1761 | ||
1762 | (P) An invalid scratch pad offset was detected internally. | |
1763 | ||
1764 | =item panic: pad_swipe curpad | |
1765 | ||
1766 | (P) The compiler got confused about which scratch pad it was allocating | |
1767 | and freeing temporaries and lexicals from. | |
1768 | ||
1769 | =item panic: pad_swipe po | |
1770 | ||
1771 | (P) An invalid scratch pad offset was detected internally. | |
1772 | ||
1773 | =item panic: pp_iter | |
1774 | ||
1775 | (P) The foreach iterator got called in a non-loop context frame. | |
1776 | ||
1777 | =item panic: realloc | |
1778 | ||
1779 | (P) Something requested a negative number of bytes of realloc. | |
1780 | ||
1781 | =item panic: restartop | |
1782 | ||
1783 | (P) Some internal routine requested a goto (or something like it), and | |
1784 | didn't supply the destination. | |
1785 | ||
1786 | =item panic: return | |
1787 | ||
1788 | (P) We popped the context stack to a subroutine or eval context, and | |
1789 | then discovered it wasn't a subroutine or eval context. | |
1790 | ||
1791 | =item panic: scan_num | |
1792 | ||
1793 | (P) scan_num() got called on something that wasn't a number. | |
1794 | ||
1795 | =item panic: sv_insert | |
1796 | ||
1797 | (P) The sv_insert() routine was told to remove more string than there | |
1798 | was string. | |
1799 | ||
1800 | =item panic: top_env | |
1801 | ||
1802 | (P) The compiler attempted to do a goto, or something weird like that. | |
1803 | ||
1804 | =item panic: yylex | |
1805 | ||
1806 | (P) The lexer got into a bad state while processing a case modifier. | |
1807 | ||
5f05dabc | 1808 | =item Pareneses missing around "%s" list |
a0d0e21e LW |
1809 | |
1810 | (W) You said something like | |
1811 | ||
1812 | my $foo, $bar = @_; | |
1813 | ||
1814 | when you meant | |
1815 | ||
1816 | my ($foo, $bar) = @_; | |
1817 | ||
1818 | Remember that "my" and "local" bind closer than comma. | |
1819 | ||
1820 | =item Perl %3.3f required--this is only version %s, stopped | |
1821 | ||
1822 | (F) The module in question uses features of a version of Perl more recent | |
1823 | than the currently running version. How long has it been since you upgraded, | |
1824 | anyway? See L<perlfunc/require>. | |
1825 | ||
1826 | =item Permission denied | |
1827 | ||
1828 | (F) The setuid emulator in suidperl decided you were up to no good. | |
1829 | ||
748a9306 LW |
1830 | =item pid %d not a child |
1831 | ||
1832 | (W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which | |
1833 | isn't a subprocess of the current process. While this is fine from VMS' | |
1834 | perspective, it's probably not what you intended. | |
1835 | ||
a0d0e21e LW |
1836 | =item POSIX getpgrp can't take an argument |
1837 | ||
1838 | (F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike | |
1839 | the BSD version, which takes a pid. | |
1840 | ||
bbce6d69 | 1841 | =item Possible attempt to put comments in qw() list |
1842 | ||
774d564b | 1843 | (W) qw() lists contain items separated by whitespace; as with literal |
1844 | strings, comment characters are not ignored, but are instead treated | |
1845 | as literal data. (You may have used different delimiters than the | |
1846 | exclamation marks parentheses shown here; braces are also frequently | |
1847 | used.) | |
bbce6d69 | 1848 | |
774d564b | 1849 | You probably wrote something like this: |
1850 | ||
54310121 | 1851 | @list = qw( |
774d564b | 1852 | a # a comment |
bbce6d69 | 1853 | b # another comment |
774d564b | 1854 | ); |
bbce6d69 | 1855 | |
1856 | when you should have written this: | |
1857 | ||
774d564b | 1858 | @list = qw( |
54310121 | 1859 | a |
1860 | b | |
774d564b | 1861 | ); |
1862 | ||
1863 | If you really want comments, build your list the | |
1864 | old-fashioned way, with quotes and commas: | |
1865 | ||
1866 | @list = ( | |
1867 | 'a', # a comment | |
1868 | 'b', # another comment | |
1869 | ); | |
bbce6d69 | 1870 | |
1871 | =item Possible attempt to separate words with commas | |
1872 | ||
774d564b | 1873 | (W) qw() lists contain items separated by whitespace; therefore commas |
68dc0745 | 1874 | aren't needed to separate the items. (You may have used different |
774d564b | 1875 | delimiters than the parentheses shown here; braces are also frequently |
1876 | used.) | |
bbce6d69 | 1877 | |
54310121 | 1878 | You probably wrote something like this: |
bbce6d69 | 1879 | |
774d564b | 1880 | qw! a, b, c !; |
1881 | ||
1882 | which puts literal commas into some of the list items. Write it without | |
1883 | commas if you don't want them to appear in your data: | |
bbce6d69 | 1884 | |
774d564b | 1885 | qw! a b c !; |
bbce6d69 | 1886 | |
a0d0e21e LW |
1887 | =item Possible memory corruption: %s overflowed 3rd argument |
1888 | ||
1889 | (F) An ioctl() or fcntl() returned more than Perl was bargaining for. | |
1890 | Perl guesses a reasonable buffer size, but puts a sentinel byte at the | |
1891 | end of the buffer just in case. This sentinel byte got clobbered, and | |
1892 | Perl assumes that memory is now corrupted. See L<perlfunc/ioctl>. | |
1893 | ||
1894 | =item Precedence problem: open %s should be open(%s) | |
1895 | ||
1896 | (S) The old irregular construct | |
cb1a09d0 | 1897 | |
a0d0e21e LW |
1898 | open FOO || die; |
1899 | ||
1900 | is now misinterpreted as | |
1901 | ||
1902 | open(FOO || die); | |
1903 | ||
68dc0745 | 1904 | because of the strict regularization of Perl 5's grammar into unary |
1905 | and list operators. (The old open was a little of both.) You must | |
1906 | put parentheses around the filehandle, or use the new "or" operator | |
1907 | instead of "||". | |
a0d0e21e LW |
1908 | |
1909 | =item print on closed filehandle %s | |
1910 | ||
1911 | (W) The filehandle you're printing on got itself closed sometime before now. | |
1912 | Check your logic flow. | |
1913 | ||
1914 | =item printf on closed filehandle %s | |
1915 | ||
1916 | (W) The filehandle you're writing to got itself closed sometime before now. | |
1917 | Check your logic flow. | |
1918 | ||
1919 | =item Probable precedence problem on %s | |
1920 | ||
54310121 | 1921 | (W) The compiler found a bareword where it expected a conditional, |
a0d0e21e LW |
1922 | which often indicates that an || or && was parsed as part of the |
1923 | last argument of the previous construct, for example: | |
1924 | ||
1925 | open FOO || die; | |
1926 | ||
3fe9a6f1 | 1927 | =item Prototype mismatch: %s vs %s |
4633a7c4 | 1928 | |
3fe9a6f1 | 1929 | (S) The subroutine being declared or defined had previously been declared |
1930 | or defined with a different function prototype. | |
4633a7c4 | 1931 | |
8b1a09fc | 1932 | =item Read on closed filehandle E<lt>%sE<gt> |
a0d0e21e LW |
1933 | |
1934 | (W) The filehandle you're reading from got itself closed sometime before now. | |
1935 | Check your logic flow. | |
1936 | ||
1937 | =item Reallocation too large: %lx | |
1938 | ||
54310121 | 1939 | (F) You can't allocate more than 64K on an MS-DOS machine. |
a0d0e21e LW |
1940 | |
1941 | =item Recompile perl with B<-D>DEBUGGING to use B<-D> switch | |
1942 | ||
1943 | (F) You can't use the B<-D> option unless the code to produce the | |
1944 | desired output is compiled into Perl, which entails some overhead, | |
1945 | which is why it's currently left out of your copy. | |
1946 | ||
1947 | =item Recursive inheritance detected | |
1948 | ||
1949 | (F) More than 100 levels of inheritance were used. Probably indicates | |
1950 | an unintended loop in your inheritance hierarchy. | |
1951 | ||
1952 | =item Reference miscount in sv_replace() | |
1953 | ||
1954 | (W) The internal sv_replace() function was handed a new SV with a | |
1955 | reference count of other than 1. | |
1956 | ||
1957 | =item regexp memory corruption | |
1958 | ||
1959 | (P) The regular expression engine got confused by what the regular | |
1960 | expression compiler gave it. | |
1961 | ||
1962 | =item regexp out of space | |
1963 | ||
1964 | (P) A "can't happen" error, because safemalloc() should have caught it earlier. | |
1965 | ||
1966 | =item regexp too big | |
1967 | ||
2ba9eb46 | 1968 | (F) The current implementation of regular expressions uses shorts as |
a0d0e21e LW |
1969 | address offsets within a string. Unfortunately this means that if |
1970 | the regular expression compiles to longer than 32767, it'll blow up. | |
1971 | Usually when you want a regular expression this big, there is a better | |
1972 | way to do it with multiple statements. See L<perlre>. | |
1973 | ||
1974 | =item Reversed %s= operator | |
1975 | ||
1976 | (W) You wrote your assignment operator backwards. The = must always | |
1977 | comes last, to avoid ambiguity with subsequent unary operators. | |
1978 | ||
1979 | =item Runaway format | |
1980 | ||
1981 | (F) Your format contained the ~~ repeat-until-blank sequence, but it | |
1982 | produced 200 lines at once, and the 200th line looked exactly like the | |
1983 | 199th line. Apparently you didn't arrange for the arguments to exhaust | |
1984 | themselves, either by using ^ instead of @ (for scalar variables), or by | |
1985 | shifting or popping (for array variables). See L<perlform>. | |
1986 | ||
1987 | =item Scalar value @%s[%s] better written as $%s[%s] | |
1988 | ||
a6006777 | 1989 | (W) You've used an array slice (indicated by @) to select a single element of |
a0d0e21e | 1990 | an array. Generally it's better to ask for a scalar value (indicated by $). |
8b1a09fc | 1991 | The difference is that C<$foo[&bar]> always behaves like a scalar, both when |
1992 | assigning to it and when evaluating its argument, while C<@foo[&bar]> behaves | |
a0d0e21e | 1993 | like a list when you assign to it, and provides a list context to its |
5f05dabc | 1994 | subscript, which can do weird things if you're expecting only one subscript. |
a0d0e21e | 1995 | |
748a9306 | 1996 | On the other hand, if you were actually hoping to treat the array |
5f05dabc | 1997 | element as a list, you need to look into how references work, because |
748a9306 LW |
1998 | Perl will not magically convert between scalars and lists for you. See |
1999 | L<perlref>. | |
2000 | ||
a6006777 | 2001 | =item Scalar value @%s{%s} better written as $%s{%s} |
2002 | ||
2003 | (W) You've used a hash slice (indicated by @) to select a single element of | |
2004 | a hash. Generally it's better to ask for a scalar value (indicated by $). | |
2005 | The difference is that C<$foo{&bar}> always behaves like a scalar, both when | |
2006 | assigning to it and when evaluating its argument, while C<@foo{&bar}> behaves | |
2007 | like a list when you assign to it, and provides a list context to its | |
2008 | subscript, which can do weird things if you're expecting only one subscript. | |
2009 | ||
2010 | On the other hand, if you were actually hoping to treat the hash | |
2011 | element as a list, you need to look into how references work, because | |
2012 | Perl will not magically convert between scalars and lists for you. See | |
2013 | L<perlref>. | |
2014 | ||
a0d0e21e LW |
2015 | =item Script is not setuid/setgid in suidperl |
2016 | ||
54310121 | 2017 | (F) Oddly, the suidperl program was invoked on a script without a setuid |
2018 | or setgid bit set. This doesn't make much sense. | |
a0d0e21e LW |
2019 | |
2020 | =item Search pattern not terminated | |
2021 | ||
2022 | (F) The lexer couldn't find the final delimiter of a // or m{} | |
2023 | construct. Remember that bracketing delimiters count nesting level. | |
2024 | ||
96e4d5b1 | 2025 | =item %sseek() on unopened file |
a0d0e21e | 2026 | |
96e4d5b1 | 2027 | (W) You tried to use the seek() or sysseek() function on a filehandle that |
2028 | was either never opened or has since been closed. | |
a0d0e21e LW |
2029 | |
2030 | =item select not implemented | |
2031 | ||
2032 | (F) This machine doesn't implement the select() system call. | |
2033 | ||
2034 | =item sem%s not implemented | |
2035 | ||
2036 | (F) You don't have System V semaphore IPC on your system. | |
2037 | ||
2038 | =item semi-panic: attempt to dup freed string | |
2039 | ||
2040 | (S) The internal newSVsv() routine was called to duplicate a scalar | |
2041 | that had previously been marked as free. | |
2042 | ||
2043 | =item Semicolon seems to be missing | |
2044 | ||
2045 | (W) A nearby syntax error was probably caused by a missing semicolon, | |
2046 | or possibly some other missing operator, such as a comma. | |
2047 | ||
2048 | =item Send on closed socket | |
2049 | ||
2050 | (W) The filehandle you're sending to got itself closed sometime before now. | |
2051 | Check your logic flow. | |
2052 | ||
2053 | =item Sequence (?#... not terminated | |
2054 | ||
2055 | (F) A regular expression comment must be terminated by a closing | |
5f05dabc | 2056 | parenthesis. Embedded parentheses aren't allowed. See L<perlre>. |
a0d0e21e LW |
2057 | |
2058 | =item Sequence (?%s...) not implemented | |
2059 | ||
2060 | (F) A proposed regular expression extension has the character reserved | |
2061 | but has not yet been written. See L<perlre>. | |
2062 | ||
2063 | =item Sequence (?%s...) not recognized | |
2064 | ||
2065 | (F) You used a regular expression extension that doesn't make sense. | |
2066 | See L<perlre>. | |
2067 | ||
a5f75d66 AD |
2068 | =item Server error |
2069 | ||
9607fc9c | 2070 | Also known as "500 Server error". |
2071 | ||
2072 | B<This is a CGI error, not a Perl error>. | |
2073 | ||
2074 | You need to make sure your script is executable, is accessible by the user | |
2075 | CGI is running the script under (which is probably not the user account you | |
2076 | tested it under), does not rely on any environment variables (like PATH) | |
2077 | from the user it isn't running under, and isn't in a location where the CGI | |
2078 | server can't find it, basically, more or less. Please see the following | |
2079 | for more information: | |
2080 | ||
2081 | http://www.perl.com/perl/faq/idiots-guide.html | |
2082 | http://www.perl.com/perl/faq/perl-cgi-faq.html | |
2083 | ftp://rtfm.mit.edu/pub/usenet/news.answers/www/cgi-faq | |
2084 | http://hoohoo.ncsa.uiuc.edu/cgi/interface.html | |
2085 | http://www-genome.wi.mit.edu/WWW/faqs/www-security-faq.html | |
a5f75d66 | 2086 | |
a0d0e21e LW |
2087 | =item setegid() not implemented |
2088 | ||
8b1a09fc | 2089 | (F) You tried to assign to C<$)>, and your operating system doesn't support |
a0d0e21e LW |
2090 | the setegid() system call (or equivalent), or at least Configure didn't |
2091 | think so. | |
2092 | ||
2093 | =item seteuid() not implemented | |
2094 | ||
8b1a09fc | 2095 | (F) You tried to assign to C<$E<gt>>, and your operating system doesn't support |
a0d0e21e LW |
2096 | the seteuid() system call (or equivalent), or at least Configure didn't |
2097 | think so. | |
2098 | ||
2099 | =item setrgid() not implemented | |
2100 | ||
8b1a09fc | 2101 | (F) You tried to assign to C<$(>, and your operating system doesn't support |
a0d0e21e LW |
2102 | the setrgid() system call (or equivalent), or at least Configure didn't |
2103 | think so. | |
2104 | ||
2105 | =item setruid() not implemented | |
2106 | ||
8b1a09fc | 2107 | (F) You tried to assign to C<$<lt>>, and your operating system doesn't support |
a0d0e21e LW |
2108 | the setruid() system call (or equivalent), or at least Configure didn't |
2109 | think so. | |
2110 | ||
2111 | =item Setuid/gid script is writable by world | |
2112 | ||
2113 | (F) The setuid emulator won't run a script that is writable by the world, | |
2114 | because the world might have written on it already. | |
2115 | ||
2116 | =item shm%s not implemented | |
2117 | ||
2118 | (F) You don't have System V shared memory IPC on your system. | |
2119 | ||
2120 | =item shutdown() on closed fd | |
2121 | ||
2122 | (W) You tried to do a shutdown on a closed socket. Seems a bit superfluous. | |
2123 | ||
f86702cc | 2124 | =item SIG%s handler "%s" not defined |
a0d0e21e LW |
2125 | |
2126 | (W) The signal handler named in %SIG doesn't, in fact, exist. Perhaps you | |
2127 | put it into the wrong package? | |
2128 | ||
2129 | =item sort is now a reserved word | |
2130 | ||
2131 | (F) An ancient error message that almost nobody ever runs into anymore. | |
2132 | But before sort was a keyword, people sometimes used it as a filehandle. | |
2133 | ||
2134 | =item Sort subroutine didn't return a numeric value | |
2135 | ||
2136 | (F) A sort comparison routine must return a number. You probably blew | |
4633a7c4 | 2137 | it by not using C<E<lt>=E<gt>> or C<cmp>, or by not using them correctly. |
a0d0e21e LW |
2138 | See L<perlfunc/sort>. |
2139 | ||
2140 | =item Sort subroutine didn't return single value | |
2141 | ||
2142 | (F) A sort comparison subroutine may not return a list value with more | |
2143 | or less than one element. See L<perlfunc/sort>. | |
2144 | ||
2145 | =item Split loop | |
2146 | ||
2147 | (P) The split was looping infinitely. (Obviously, a split shouldn't iterate | |
2148 | more times than there are characters of input, which is what happened.) | |
2149 | See L<perlfunc/split>. | |
2150 | ||
8b1a09fc | 2151 | =item Stat on unopened file E<lt>%sE<gt> |
a0d0e21e LW |
2152 | |
2153 | (W) You tried to use the stat() function (or an equivalent file test) | |
54310121 | 2154 | on a filehandle that was either never opened or has since been closed. |
a0d0e21e LW |
2155 | |
2156 | =item Statement unlikely to be reached | |
2157 | ||
2158 | (W) You did an exec() with some statement after it other than a die(). | |
2159 | This is almost always an error, because exec() never returns unless | |
2160 | there was a failure. You probably wanted to use system() instead, | |
2161 | which does return. To suppress this warning, put the exec() in a block | |
2162 | by itself. | |
2163 | ||
e7ea3e70 IZ |
2164 | =item Stub found while resolving method `%s' overloading `%s' in package `%s' |
2165 | ||
2166 | (P) Overloading resolution over @ISA tree may be broken by importation stubs. | |
2167 | Stubs should never be implicitely created, but explicit calls to C<can> | |
2168 | may break this. | |
2169 | ||
a0d0e21e LW |
2170 | =item Subroutine %s redefined |
2171 | ||
2172 | (W) You redefined a subroutine. To suppress this warning, say | |
2173 | ||
2174 | { | |
2175 | local $^W = 0; | |
2176 | eval "sub name { ... }"; | |
2177 | } | |
2178 | ||
2179 | =item Substitution loop | |
2180 | ||
2181 | (P) The substitution was looping infinitely. (Obviously, a | |
2182 | substitution shouldn't iterate more times than there are characters of | |
68dc0745 | 2183 | input, which is what happened.) See the discussion of substitution in |
5f05dabc | 2184 | L<perlop/"Quote and Quote-like Operators">. |
a0d0e21e LW |
2185 | |
2186 | =item Substitution pattern not terminated | |
2187 | ||
2188 | (F) The lexer couldn't find the interior delimiter of a s/// or s{}{} | |
2189 | construct. Remember that bracketing delimiters count nesting level. | |
2190 | ||
2191 | =item Substitution replacement not terminated | |
2192 | ||
2193 | (F) The lexer couldn't find the final delimiter of a s/// or s{}{} | |
2194 | construct. Remember that bracketing delimiters count nesting level. | |
2195 | ||
2196 | =item substr outside of string | |
2197 | ||
2198 | (W) You tried to reference a substr() that pointed outside of a string. | |
2199 | That is, the absolute value of the offset was larger than the length of | |
2200 | the string. See L<perlfunc/substr>. | |
2201 | ||
f86702cc | 2202 | =item suidperl is no longer needed since %s |
a0d0e21e LW |
2203 | |
2204 | (F) Your Perl was compiled with B<-D>SETUID_SCRIPTS_ARE_SECURE_NOW, but a | |
2205 | version of the setuid emulator somehow got run anyway. | |
2206 | ||
2207 | =item syntax error | |
2208 | ||
2209 | (F) Probably means you had a syntax error. Common reasons include: | |
2210 | ||
2211 | A keyword is misspelled. | |
2212 | A semicolon is missing. | |
2213 | A comma is missing. | |
2214 | An opening or closing parenthesis is missing. | |
2215 | An opening or closing brace is missing. | |
2216 | A closing quote is missing. | |
2217 | ||
2218 | Often there will be another error message associated with the syntax | |
2219 | error giving more information. (Sometimes it helps to turn on B<-w>.) | |
2220 | The error message itself often tells you where it was in the line when | |
2221 | it decided to give up. Sometimes the actual error is several tokens | |
5f05dabc | 2222 | before this, because Perl is good at understanding random input. |
a0d0e21e LW |
2223 | Occasionally the line number may be misleading, and once in a blue moon |
2224 | the only way to figure out what's triggering the error is to call | |
2225 | C<perl -c> repeatedly, chopping away half the program each time to see | |
2226 | if the error went away. Sort of the cybernetic version of S<20 questions>. | |
2227 | ||
cb1a09d0 AD |
2228 | =item syntax error at line %d: `%s' unexpected |
2229 | ||
8b1a09fc | 2230 | (A) You've accidentally run your script through the Bourne shell |
3a52c276 | 2231 | instead of Perl. Check the #! line, or manually feed your script |
cb1a09d0 AD |
2232 | into Perl yourself. |
2233 | ||
a0d0e21e LW |
2234 | =item System V IPC is not implemented on this machine |
2235 | ||
5f05dabc | 2236 | (F) You tried to do something with a function beginning with "sem", "shm", |
a0d0e21e LW |
2237 | or "msg". See L<perlfunc/semctl>, for example. |
2238 | ||
2239 | =item Syswrite on closed filehandle | |
2240 | ||
2241 | (W) The filehandle you're writing to got itself closed sometime before now. | |
2242 | Check your logic flow. | |
2243 | ||
fc36a67e | 2244 | =item Target of goto is too deeply nested |
2245 | ||
2246 | (F) You tried to use C<goto> to reach a label that was too deeply | |
2247 | nested for Perl to reach. Perl is doing you a favor by refusing. | |
2248 | ||
8903cb82 | 2249 | =item tell() on unopened file |
a0d0e21e | 2250 | |
8903cb82 | 2251 | (W) You tried to use the tell() function on a filehandle that was either |
2252 | never opened or has since been closed. | |
a0d0e21e | 2253 | |
8b1a09fc | 2254 | =item Test on unopened file E<lt>%sE<gt> |
a0d0e21e LW |
2255 | |
2256 | (W) You tried to invoke a file test operator on a filehandle that isn't | |
2257 | open. Check your logic. See also L<perlfunc/-X>. | |
2258 | ||
2259 | =item That use of $[ is unsupported | |
2260 | ||
8b1a09fc | 2261 | (F) Assignment to C<$[> is now strictly circumscribed, and interpreted as |
5f05dabc | 2262 | a compiler directive. You may say only one of |
a0d0e21e LW |
2263 | |
2264 | $[ = 0; | |
2265 | $[ = 1; | |
2266 | ... | |
2267 | local $[ = 0; | |
2268 | local $[ = 1; | |
2269 | ... | |
2270 | ||
2271 | This is to prevent the problem of one module changing the array base | |
2272 | out from under another module inadvertently. See L<perlvar/$[>. | |
2273 | ||
2274 | =item The %s function is unimplemented | |
2275 | ||
2276 | The function indicated isn't implemented on this architecture, according | |
2277 | to the probings of Configure. | |
2278 | ||
f86702cc | 2279 | =item The crypt() function is unimplemented due to excessive paranoia |
a0d0e21e LW |
2280 | |
2281 | (F) Configure couldn't find the crypt() function on your machine, | |
2282 | probably because your vendor didn't supply it, probably because they | |
8b1a09fc | 2283 | think the U.S. Government thinks it's a secret, or at least that they |
a0d0e21e LW |
2284 | will continue to pretend that it is. And if you quote me on that, I |
2285 | will deny it. | |
2286 | ||
2287 | =item The stat preceding C<-l _> wasn't an lstat | |
2288 | ||
2289 | (F) It makes no sense to test the current stat buffer for symbolic linkhood | |
2290 | if the last stat that wrote to the stat buffer already went past | |
2291 | the symlink to get to the real file. Use an actual filename instead. | |
2292 | ||
2293 | =item times not implemented | |
2294 | ||
2295 | (F) Your version of the C library apparently doesn't do times(). I suspect | |
2296 | you're not running on Unix. | |
2297 | ||
2298 | =item Too few args to syscall | |
2299 | ||
2300 | (F) There has to be at least one argument to syscall() to specify the | |
2301 | system call to call, silly dilly. | |
2302 | ||
9607fc9c | 2303 | =item Too late for "B<-T>" option |
2304 | ||
2305 | (X) The #! line (or local equivalent) in a Perl script contains the | |
8cc95fdb | 2306 | B<-T> option, but Perl was not invoked with B<-T> in its command line. |
2307 | This is an error because, by the time Perl discovers a B<-T> in a | |
2308 | script, it's too late to properly taint everything from the environment. | |
2309 | So Perl gives up. | |
f86702cc | 2310 | |
9607fc9c | 2311 | If the Perl script is being executed as a command using the #! |
2312 | mechanism (or its local equivalent), this error can usually be fixed | |
2313 | by editing the #! line so that the B<-T> option is a part of Perl's | |
2314 | first argument: e.g. change C<perl -n -T> to C<perl -T -n>. | |
f86702cc | 2315 | |
9607fc9c | 2316 | If the Perl script is being executed as C<perl scriptname>, then the |
2317 | B<-T> option must appear on the command line: C<perl -T scriptname>. | |
f86702cc | 2318 | |
8cc95fdb | 2319 | =item Too late for "-%s" option |
2320 | ||
2321 | (X) The #! line (or local equivalent) in a Perl script contains the | |
2322 | B<-M> or B<-m> option. This is an error because B<-M> and B<-m> options | |
2323 | are not intended for use inside scripts. Use the C<use> pragma instead. | |
2324 | ||
cb1a09d0 AD |
2325 | =item Too many ('s |
2326 | ||
2327 | =item Too many )'s | |
2328 | ||
2329 | (A) You've accidentally run your script through B<csh> instead | |
3a52c276 CS |
2330 | of Perl. Check the #! line, or manually feed your script into |
2331 | Perl yourself. | |
cb1a09d0 | 2332 | |
a0d0e21e LW |
2333 | =item Too many args to syscall |
2334 | ||
5f05dabc | 2335 | (F) Perl supports a maximum of only 14 args to syscall(). |
a0d0e21e LW |
2336 | |
2337 | =item Too many arguments for %s | |
2338 | ||
2339 | (F) The function requires fewer arguments than you specified. | |
2340 | ||
2341 | =item trailing \ in regexp | |
2342 | ||
2343 | (F) The regular expression ends with an unbackslashed backslash. Backslash | |
2344 | it. See L<perlre>. | |
2345 | ||
2346 | =item Translation pattern not terminated | |
2347 | ||
2348 | (F) The lexer couldn't find the interior delimiter of a tr/// or tr[][] | |
2349 | construct. | |
2350 | ||
2351 | =item Translation replacement not terminated | |
2352 | ||
2353 | (F) The lexer couldn't find the final delimiter of a tr/// or tr[][] | |
2354 | construct. | |
2355 | ||
2356 | =item truncate not implemented | |
2357 | ||
2358 | (F) Your machine doesn't implement a file truncation mechanism that | |
2359 | Configure knows about. | |
2360 | ||
2361 | =item Type of arg %d to %s must be %s (not %s) | |
2362 | ||
2363 | (F) This function requires the argument in that position to be of a | |
8b1a09fc | 2364 | certain type. Arrays must be @NAME or C<@{EXPR}>. Hashes must be |
2365 | %NAME or C<%{EXPR}>. No implicit dereferencing is allowed--use the | |
a0d0e21e LW |
2366 | {EXPR} forms as an explicit dereference. See L<perlref>. |
2367 | ||
2368 | =item umask: argument is missing initial 0 | |
2369 | ||
5f05dabc | 2370 | (W) A umask of 222 is incorrect. It should be 0222, because octal literals |
a0d0e21e LW |
2371 | always start with 0 in Perl, as in C. |
2372 | ||
4633a7c4 LW |
2373 | =item Unable to create sub named "%s" |
2374 | ||
2375 | (F) You attempted to create or access a subroutine with an illegal name. | |
2376 | ||
a0d0e21e LW |
2377 | =item Unbalanced context: %d more PUSHes than POPs |
2378 | ||
2379 | (W) The exit code detected an internal inconsistency in how many execution | |
2380 | contexts were entered and left. | |
2381 | ||
2382 | =item Unbalanced saves: %d more saves than restores | |
2383 | ||
2384 | (W) The exit code detected an internal inconsistency in how many | |
2385 | values were temporarily localized. | |
2386 | ||
2387 | =item Unbalanced scopes: %d more ENTERs than LEAVEs | |
2388 | ||
2389 | (W) The exit code detected an internal inconsistency in how many blocks | |
2390 | were entered and left. | |
2391 | ||
2392 | =item Unbalanced tmps: %d more allocs than frees | |
2393 | ||
2394 | (W) The exit code detected an internal inconsistency in how many mortal | |
2395 | scalars were allocated and freed. | |
2396 | ||
2397 | =item Undefined format "%s" called | |
2398 | ||
2399 | (F) The format indicated doesn't seem to exist. Perhaps it's really in | |
2400 | another package? See L<perlform>. | |
2401 | ||
2402 | =item Undefined sort subroutine "%s" called | |
2403 | ||
2404 | (F) The sort comparison routine specified doesn't seem to exist. Perhaps | |
2405 | it's in a different package? See L<perlfunc/sort>. | |
2406 | ||
2407 | =item Undefined subroutine &%s called | |
2408 | ||
2409 | (F) The subroutine indicated hasn't been defined, or if it was, it | |
2410 | has since been undefined. | |
2411 | ||
2412 | =item Undefined subroutine called | |
2413 | ||
2414 | (F) The anonymous subroutine you're trying to call hasn't been defined, | |
2415 | or if it was, it has since been undefined. | |
2416 | ||
2417 | =item Undefined subroutine in sort | |
2418 | ||
2419 | (F) The sort comparison routine specified is declared but doesn't seem to | |
2420 | have been defined yet. See L<perlfunc/sort>. | |
2421 | ||
4633a7c4 LW |
2422 | =item Undefined top format "%s" called |
2423 | ||
2424 | (F) The format indicated doesn't seem to exist. Perhaps it's really in | |
2425 | another package? See L<perlform>. | |
2426 | ||
a0d0e21e LW |
2427 | =item unexec of %s into %s failed! |
2428 | ||
2429 | (F) The unexec() routine failed for some reason. See your local FSF | |
2430 | representative, who probably put it there in the first place. | |
2431 | ||
2432 | =item Unknown BYTEORDER | |
2433 | ||
5f05dabc | 2434 | (F) There are no byte-swapping functions for a machine with this byte order. |
a0d0e21e LW |
2435 | |
2436 | =item unmatched () in regexp | |
2437 | ||
2438 | (F) Unbackslashed parentheses must always be balanced in regular | |
2439 | expressions. If you're a vi user, the % key is valuable for finding | |
5f05dabc | 2440 | the matching parenthesis. See L<perlre>. |
a0d0e21e LW |
2441 | |
2442 | =item Unmatched right bracket | |
2443 | ||
2444 | (F) The lexer counted more closing curly brackets (braces) than opening | |
2445 | ones, so you're probably missing an opening bracket. As a general | |
2446 | rule, you'll find the missing one (so to speak) near the place you were | |
2447 | last editing. | |
2448 | ||
2449 | =item unmatched [] in regexp | |
2450 | ||
2451 | (F) The brackets around a character class must match. If you wish to | |
2452 | include a closing bracket in a character class, backslash it or put it first. | |
2453 | See L<perlre>. | |
2454 | ||
2455 | =item Unquoted string "%s" may clash with future reserved word | |
2456 | ||
54310121 | 2457 | (W) You used a bareword that might someday be claimed as a reserved word. |
a0d0e21e LW |
2458 | It's best to put such a word in quotes, or capitalize it somehow, or insert |
2459 | an underbar into it. You might also declare it as a subroutine. | |
2460 | ||
54310121 | 2461 | =item Unrecognized character %s |
a0d0e21e | 2462 | |
54310121 | 2463 | (F) The Perl parser has no idea what to do with the specified character |
2464 | in your Perl script (or eval). Perhaps you tried to run a compressed | |
2465 | script, a binary program, or a directory as a Perl program. | |
a0d0e21e LW |
2466 | |
2467 | =item Unrecognized signal name "%s" | |
2468 | ||
2469 | (F) You specified a signal name to the kill() function that was not recognized. | |
2470 | Say C<kill -l> in your shell to see the valid signal names on your system. | |
2471 | ||
2472 | =item Unrecognized switch: -%s | |
2473 | ||
2474 | (F) You specified an illegal option to Perl. Don't do that. | |
2475 | (If you think you didn't do that, check the #! line to see if it's | |
2476 | supplying the bad switch on your behalf.) | |
2477 | ||
2478 | =item Unsuccessful %s on filename containing newline | |
2479 | ||
2480 | (W) A file operation was attempted on a filename, and that operation | |
2481 | failed, PROBABLY because the filename contained a newline, PROBABLY | |
54310121 | 2482 | because you forgot to chop() or chomp() it off. See L<perlfunc/chomp>. |
a0d0e21e LW |
2483 | |
2484 | =item Unsupported directory function "%s" called | |
2485 | ||
2486 | (F) Your machine doesn't support opendir() and readdir(). | |
2487 | ||
54310121 | 2488 | =item Unsupported function fork |
2489 | ||
2490 | (F) Your version of executable does not support forking. | |
2491 | ||
2492 | Note that under some systems, like OS/2, there may be different flavors of | |
2493 | Perl executables, some of which may support fork, some not. Try changing | |
2494 | the name you call Perl by to C<perl_>, C<perl__>, and so on. | |
2495 | ||
a0d0e21e LW |
2496 | =item Unsupported function %s |
2497 | ||
2498 | (F) This machines doesn't implement the indicated function, apparently. | |
2499 | At least, Configure doesn't think so. | |
2500 | ||
2501 | =item Unsupported socket function "%s" called | |
2502 | ||
2503 | (F) Your machine doesn't support the Berkeley socket mechanism, or at | |
2504 | least that's what Configure thought. | |
2505 | ||
8b1a09fc | 2506 | =item Unterminated E<lt>E<gt> operator |
a0d0e21e LW |
2507 | |
2508 | (F) The lexer saw a left angle bracket in a place where it was expecting | |
2509 | a term, so it's looking for the corresponding right angle bracket, and not | |
2510 | finding it. Chances are you left some needed parentheses out earlier in | |
2511 | the line, and you really meant a "less than". | |
2512 | ||
5cd24f17 | 2513 | =item Use of "$$<digit>" to mean "${$}<digit>" is deprecated |
2514 | ||
2515 | (D) Perl versions before 5.004 misinterpreted any type marker followed | |
2516 | by "$" and a digit. For example, "$$0" was incorrectly taken to mean | |
2517 | "${$}0" instead of "${$0}". This bug is (mostly) fixed in Perl 5.004. | |
2518 | ||
2519 | However, the developers of Perl 5.004 could not fix this bug completely, | |
2520 | because at least two widely-used modules depend on the old meaning of | |
2521 | "$$0" in a string. So Perl 5.004 still interprets "$$<digit>" in the | |
2522 | old (broken) way inside strings; but it generates this message as a | |
2523 | warning. And in Perl 5.005, this special treatment will cease. | |
2524 | ||
a0d0e21e LW |
2525 | =item Use of $# is deprecated |
2526 | ||
8b1a09fc | 2527 | (D) This was an ill-advised attempt to emulate a poorly defined B<awk> feature. |
a0d0e21e LW |
2528 | Use an explicit printf() or sprintf() instead. |
2529 | ||
2530 | =item Use of $* is deprecated | |
2531 | ||
4a6725af | 2532 | (D) This variable magically turned on multi-line pattern matching, both for |
a0d0e21e LW |
2533 | you and for any luckless subroutine that you happen to call. You should |
2534 | use the new C<//m> and C<//s> modifiers now to do that without the dangerous | |
2535 | action-at-a-distance effects of C<$*>. | |
2536 | ||
748a9306 LW |
2537 | =item Use of %s in printf format not supported |
2538 | ||
5f05dabc | 2539 | (F) You attempted to use a feature of printf that is accessible from |
2540 | only C. This usually means there's a better way to do it in Perl. | |
748a9306 | 2541 | |
8b1a09fc | 2542 | =item Use of bare E<lt>E<lt> to mean E<lt>E<lt>"" is deprecated |
4633a7c4 LW |
2543 | |
2544 | (D) You are now encouraged to use the explicitly quoted form if you | |
3fe9a6f1 | 2545 | wish to use an empty line as the terminator of the here-document. |
4633a7c4 | 2546 | |
a0d0e21e LW |
2547 | =item Use of implicit split to @_ is deprecated |
2548 | ||
2549 | (D) It makes a lot of work for the compiler when you clobber a | |
2550 | subroutine's argument list, so it's better if you assign the results of | |
2551 | a split() explicitly to an array (or list). | |
2552 | ||
dc848c6f | 2553 | =item Use of inherited AUTOLOAD for non-method %s() is deprecated |
2554 | ||
5cd24f17 | 2555 | (D) As an (ahem) accidental feature, C<AUTOLOAD> subroutines are looked |
2556 | up as methods (using the C<@ISA> hierarchy) even when the subroutines to | |
2557 | be autoloaded were called as plain functions (e.g. C<Foo::bar()>), not | |
2558 | as methods (e.g. C<Foo->bar()> or C<$obj->bar()>). | |
dc848c6f | 2559 | |
2560 | This bug will be rectified in Perl 5.005, which will use method lookup | |
2561 | only for methods' C<AUTOLOAD>s. However, there is a significant base | |
2562 | of existing code that may be using the old behavior. So, as an | |
2563 | interim step, Perl 5.004 issues an optional warning when non-methods | |
2564 | use inherited C<AUTOLOAD>s. | |
2565 | ||
2566 | The simple rule is: Inheritance will not work when autoloading | |
2567 | non-methods. The simple fix for old code is: In any module that used to | |
2568 | depend on inheriting C<AUTOLOAD> for non-methods from a base class named | |
2569 | C<BaseClass>, execute C<*AUTOLOAD = \&BaseClass::AUTOLOAD> during startup. | |
2570 | ||
2571 | =item Use of %s is deprecated | |
2572 | ||
2573 | (D) The construct indicated is no longer recommended for use, generally | |
2574 | because there's a better way to do it, and also because the old way has | |
2575 | bad side effects. | |
2576 | ||
a0d0e21e LW |
2577 | =item Use of uninitialized value |
2578 | ||
2579 | (W) An undefined value was used as if it were already defined. It was | |
2580 | interpreted as a "" or a 0, but maybe it was a mistake. To suppress this | |
2581 | warning assign an initial value to your variables. | |
2582 | ||
2583 | =item Useless use of %s in void context | |
2584 | ||
2585 | (W) You did something without a side effect in a context that does nothing | |
2586 | with the return value, such as a statement that doesn't return a value | |
2587 | from a block, or the left side of a scalar comma operator. Very often | |
2588 | this points not to stupidity on your part, but a failure of Perl to parse | |
2589 | your program the way you thought it would. For example, you'd get this | |
2590 | if you mixed up your C precedence with Python precedence and said | |
2591 | ||
2592 | $one, $two = 1, 2; | |
2593 | ||
2594 | when you meant to say | |
2595 | ||
2596 | ($one, $two) = (1, 2); | |
2597 | ||
748a9306 LW |
2598 | Another common error is to use ordinary parentheses to construct a list |
2599 | reference when you should be using square or curly brackets, for | |
2600 | example, if you say | |
2601 | ||
2602 | $array = (1,2); | |
2603 | ||
2604 | when you should have said | |
2605 | ||
2606 | $array = [1,2]; | |
2607 | ||
2608 | The square brackets explicitly turn a list value into a scalar value, | |
2609 | while parentheses do not. So when a parenthesized list is evaluated in | |
2610 | a scalar context, the comma is treated like C's comma operator, which | |
2611 | throws away the left argument, which is not what you want. See | |
2612 | L<perlref> for more on this. | |
2613 | ||
55497cff | 2614 | =item untie attempted while %d inner references still exist |
2615 | ||
2616 | (W) A copy of the object returned from C<tie> (or C<tied>) was still | |
2617 | valid when C<untie> was called. | |
2618 | ||
68dc0745 | 2619 | =item Value of %s can be "0"; test with defined() |
a6006777 | 2620 | |
68dc0745 | 2621 | (W) In a conditional expression, you used <HANDLE>, <*> (glob), C<each()>, |
2622 | or C<readdir()> as a boolean value. Each of these constructs can return a | |
2623 | value of "0"; that would make the conditional expression false, which is | |
2624 | probably not what you intended. When using these constructs in conditional | |
2625 | expressions, test their values with the C<defined> operator. | |
a6006777 | 2626 | |
9607fc9c | 2627 | =item Variable "%s" is not imported%s |
4633a7c4 LW |
2628 | |
2629 | (F) While "use strict" in effect, you referred to a global variable | |
2630 | that you apparently thought was imported from another module, because | |
2631 | something else of the same name (usually a subroutine) is exported | |
2632 | by that module. It usually means you put the wrong funny character | |
2633 | on the front of your variable. | |
2634 | ||
44a8e56a | 2635 | =item Variable "%s" may be unavailable |
2636 | ||
2637 | (W) An inner (nested) I<anonymous> subroutine is inside a I<named> | |
2638 | subroutine, and outside that is another subroutine; and the anonymous | |
2639 | (innermost) subroutine is referencing a lexical variable defined in | |
2640 | the outermost subroutine. For example: | |
2641 | ||
2642 | sub outermost { my $a; sub middle { sub { $a } } } | |
2643 | ||
2644 | If the anonymous subroutine is called or referenced (directly or | |
2645 | indirectly) from the outermost subroutine, it will share the variable | |
2646 | as you would expect. But if the anonymous subroutine is called or | |
2647 | referenced when the outermost subroutine is not active, it will see | |
2648 | the value of the shared variable as it was before and during the | |
2649 | *first* call to the outermost subroutine, which is probably not what | |
2650 | you want. | |
2651 | ||
2652 | In these circumstances, it is usually best to make the middle | |
2653 | subroutine anonymous, using the C<sub {}> syntax. Perl has specific | |
2654 | support for shared variables in nested anonymous subroutines; a named | |
2655 | subroutine in between interferes with this feature. | |
2656 | ||
2657 | =item Variable "%s" will not stay shared | |
2658 | ||
2659 | (W) An inner (nested) I<named> subroutine is referencing a lexical | |
2660 | variable defined in an outer subroutine. | |
2661 | ||
2662 | When the inner subroutine is called, it will probably see the value of | |
2663 | the outer subroutine's variable as it was before and during the | |
2664 | *first* call to the outer subroutine; in this case, after the first | |
2665 | call to the outer subroutine is complete, the inner and outer | |
2666 | subroutines will no longer share a common value for the variable. In | |
2667 | other words, the variable will no longer be shared. | |
2668 | ||
2669 | Furthermore, if the outer subroutine is anonymous and references a | |
2670 | lexical variable outside itself, then the outer and inner subroutines | |
2671 | will I<never> share the given variable. | |
2672 | ||
2673 | This problem can usually be solved by making the inner subroutine | |
2674 | anonymous, using the C<sub {}> syntax. When inner anonymous subs that | |
2675 | reference variables in outer subroutines are called or referenced, | |
54310121 | 2676 | they are automatically rebound to the current values of such |
44a8e56a | 2677 | variables. |
2678 | ||
f86702cc | 2679 | =item Variable syntax |
cb1a09d0 AD |
2680 | |
2681 | (A) You've accidentally run your script through B<csh> instead | |
3a52c276 CS |
2682 | of Perl. Check the #! line, or manually feed your script into |
2683 | Perl yourself. | |
cb1a09d0 | 2684 | |
7e1af8bc | 2685 | =item Warning: something's wrong |
5f05dabc | 2686 | |
2687 | (W) You passed warn() an empty string (the equivalent of C<warn "">) or | |
2688 | you called it with no args and C<$_> was empty. | |
2689 | ||
f86702cc | 2690 | =item Warning: unable to close filehandle %s properly |
a0d0e21e | 2691 | |
8b1a09fc | 2692 | (S) The implicit close() done by an open() got an error indication on the |
5f05dabc | 2693 | close(). This usually indicates your file system ran out of disk space. |
a0d0e21e | 2694 | |
5f05dabc | 2695 | =item Warning: Use of "%s" without parentheses is ambiguous |
a0d0e21e LW |
2696 | |
2697 | (S) You wrote a unary operator followed by something that looks like a | |
2698 | binary operator that could also have been interpreted as a term or | |
2699 | unary operator. For instance, if you know that the rand function | |
2700 | has a default argument of 1.0, and you write | |
2701 | ||
2702 | rand + 5; | |
2703 | ||
2704 | you may THINK you wrote the same thing as | |
2705 | ||
2706 | rand() + 5; | |
2707 | ||
2708 | but in actual fact, you got | |
2709 | ||
2710 | rand(+5); | |
2711 | ||
5f05dabc | 2712 | So put in parentheses to say what you really mean. |
a0d0e21e LW |
2713 | |
2714 | =item Write on closed filehandle | |
2715 | ||
2716 | (W) The filehandle you're writing to got itself closed sometime before now. | |
2717 | Check your logic flow. | |
2718 | ||
2719 | =item X outside of string | |
2720 | ||
2721 | (F) You had a pack template that specified a relative position before | |
2722 | the beginning of the string being unpacked. See L<perlfunc/pack>. | |
2723 | ||
2724 | =item x outside of string | |
2725 | ||
2726 | (F) You had a pack template that specified a relative position after | |
2727 | the end of the string being unpacked. See L<perlfunc/pack>. | |
2728 | ||
2729 | =item Xsub "%s" called in sort | |
2730 | ||
2731 | (F) The use of an external subroutine as a sort comparison is not yet supported. | |
2732 | ||
2733 | =item Xsub called in sort | |
2734 | ||
2735 | (F) The use of an external subroutine as a sort comparison is not yet supported. | |
2736 | ||
2737 | =item You can't use C<-l> on a filehandle | |
2738 | ||
2739 | (F) A filehandle represents an opened file, and when you opened the file it | |
2740 | already went past any symlink you are presumably trying to look for. | |
2741 | Use a filename instead. | |
2742 | ||
2743 | =item YOU HAVEN'T DISABLED SET-ID SCRIPTS IN THE KERNEL YET! | |
2744 | ||
5f05dabc | 2745 | (F) And you probably never will, because you probably don't have the |
a0d0e21e LW |
2746 | sources to your kernel, and your vendor probably doesn't give a rip |
2747 | about what you want. Your best bet is to use the wrapsuid script in | |
2748 | the eg directory to put a setuid C wrapper around your script. | |
2749 | ||
2750 | =item You need to quote "%s" | |
2751 | ||
2752 | (W) You assigned a bareword as a signal handler name. Unfortunately, you | |
2753 | already have a subroutine of that name declared, which means that Perl 5 | |
2754 | will try to call the subroutine when the assignment is executed, which is | |
2755 | probably not what you want. (If it IS what you want, put an & in front.) | |
2756 | ||
2757 | =item [gs]etsockopt() on closed fd | |
2758 | ||
2759 | (W) You tried to get or set a socket option on a closed socket. | |
2760 | Did you forget to check the return value of your socket() call? | |
2761 | See L<perlfunc/getsockopt>. | |
2762 | ||
2763 | =item \1 better written as $1 | |
2764 | ||
2765 | (W) Outside of patterns, backreferences live on as variables. The use | |
5f05dabc | 2766 | of backslashes is grandfathered on the right-hand side of a |
a0d0e21e LW |
2767 | substitution, but stylistically it's better to use the variable form |
2768 | because other Perl programmers will expect it, and it works better | |
2769 | if there are more than 9 backreferences. | |
2770 | ||
8b1a09fc | 2771 | =item '|' and 'E<lt>' may not both be specified on command line |
748a9306 LW |
2772 | |
2773 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
2774 | found that STDIN was a pipe, and that you also tried to redirect STDIN using | |
8b1a09fc | 2775 | 'E<lt>'. Only one STDIN stream to a customer, please. |
748a9306 | 2776 | |
8b1a09fc | 2777 | =item '|' and 'E<gt>' may not both be specified on command line |
748a9306 LW |
2778 | |
2779 | (F) An error peculiar to VMS. Perl does its own command line redirection, and | |
2780 | thinks you tried to redirect stdout both to a file and into a pipe to another | |
2781 | command. You need to choose one or the other, though nothing's stopping you | |
2782 | from piping into a program or Perl script which 'splits' output into two | |
2783 | streams, such as | |
2784 | ||
2785 | open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!"; | |
2786 | while (<STDIN>) { | |
2787 | print; | |
2788 | print OUT; | |
2789 | } | |
2790 | close OUT; | |
2791 | ||
774d564b | 2792 | =item Got an error from DosAllocMem |
33c8a3fe | 2793 | |
774d564b | 2794 | (P) An error peculiar to OS/2. Most probably you're using an obsolete |
2795 | version of Perl, and this should not happen anyway. | |
33c8a3fe IZ |
2796 | |
2797 | =item Malformed PERLLIB_PREFIX | |
2798 | ||
dc848c6f | 2799 | (F) An error peculiar to OS/2. PERLLIB_PREFIX should be of the form |
33c8a3fe IZ |
2800 | |
2801 | prefix1;prefix2 | |
2802 | ||
2803 | or | |
2804 | ||
2805 | prefix1 prefix2 | |
2806 | ||
dc848c6f | 2807 | with nonempty prefix1 and prefix2. If C<prefix1> is indeed a prefix |
2808 | of a builtin library search path, prefix2 is substituted. The error | |
2809 | may appear if components are not found, or are too long. See | |
2810 | "PERLLIB_PREFIX" in F<README.os2>. | |
33c8a3fe IZ |
2811 | |
2812 | =item PERL_SH_DIR too long | |
2813 | ||
54310121 | 2814 | (F) An error peculiar to OS/2. PERL_SH_DIR is the directory to find the |
dc848c6f | 2815 | C<sh>-shell in. See "PERL_SH_DIR" in F<README.os2>. |
33c8a3fe IZ |
2816 | |
2817 | =item Process terminated by SIG%s | |
2818 | ||
2819 | (W) This is a standard message issued by OS/2 applications, while *nix | |
dc848c6f | 2820 | applications die in silence. It is considered a feature of the OS/2 |
2821 | port. One can easily disable this by appropriate sighandlers, see | |
2822 | L<perlipc/"Signals">. See also "Process terminated by SIGTERM/SIGINT" | |
2823 | in F<README.os2>. | |
33c8a3fe | 2824 | |
a0d0e21e LW |
2825 | =back |
2826 |