Commit | Line | Data |
---|---|---|
eab60bb1 GS |
1 | use ExtUtils::MakeMaker; |
2 | use Config; | |
3 | use strict; | |
4 | ||
aa2e500f | 5 | our $VERSION = "1.13"; |
eab60bb1 GS |
6 | |
7 | my %err = (); | |
4d70086c | 8 | my %wsa = (); |
eab60bb1 | 9 | |
27da23d5 JH |
10 | # Symbian cross-compiling environment. |
11 | my $IsSymbian = exists $ENV{SDK} && -d "$ENV{SDK}\\epoc32"; | |
12 | ||
13 | my $IsMSWin32 = $^O eq 'MSWin32' && !$IsSymbian; | |
14 | ||
eab60bb1 | 15 | unlink "Errno.pm" if -f "Errno.pm"; |
cedab142 NC |
16 | unlink "Errno.tmp" if -f "Errno.tmp"; |
17 | open OUT, ">Errno.tmp" or die "Cannot open Errno.tmp: $!"; | |
eab60bb1 GS |
18 | select OUT; |
19 | my $file; | |
1e92bf58 SH |
20 | my @files = get_files(); |
21 | if ($Config{gccversion} ne '' && $^O eq 'MSWin32') { | |
22 | # MinGW complains "warning: #pragma system_header ignored outside include | |
23 | # file" if the header files are processed individually, so include them | |
24 | # all in .c file and process that instead. | |
25 | open INCS, '>includes.c' or | |
26 | die "Cannot open includes.c"; | |
27 | foreach $file (@files) { | |
eeb7067f YST |
28 | next if $file eq 'errno.c'; |
29 | next unless -f $file; | |
1e92bf58 SH |
30 | print INCS qq[#include "$file"\n]; |
31 | } | |
32 | close INCS; | |
33 | process_file('includes.c'); | |
34 | unlink 'includes.c'; | |
35 | } | |
36 | else { | |
37 | foreach $file (@files) { | |
38 | process_file($file); | |
39 | } | |
eab60bb1 GS |
40 | } |
41 | write_errno_pm(); | |
42 | unlink "errno.c" if -f "errno.c"; | |
f5800e99 NC |
43 | close OUT or die "Error closing Errno.tmp: $!"; |
44 | select STDOUT; | |
cedab142 | 45 | rename "Errno.tmp", "Errno.pm" or die "Cannot rename Errno.tmp to Errno.pm: $!"; |
eab60bb1 GS |
46 | |
47 | sub process_file { | |
48 | my($file) = @_; | |
49 | ||
22402b47 YST |
50 | # for win32 perl under cygwin, we need to get a windows pathname |
51 | if ($^O eq 'MSWin32' && $Config{cc} =~ /\B-mno-cygwin\b/ && | |
52 | defined($file) && !-f $file) { | |
53 | chomp($file = `cygpath -w "$file"`); | |
54 | } | |
55 | ||
6683669a | 56 | return unless defined $file and -f $file; |
27da23d5 | 57 | # warn "Processing $file\n"; |
eab60bb1 GS |
58 | |
59 | local *FH; | |
60 | if (($^O eq 'VMS') && ($Config{vms_cc_type} ne 'gnuc')) { | |
61 | unless(open(FH," LIBRARY/EXTRACT=ERRNO/OUTPUT=SYS\$OUTPUT $file |")) { | |
62 | warn "Cannot open '$file'"; | |
63 | return; | |
64 | } | |
7237d657 | 65 | } elsif ($Config{gccversion} ne '' |
8ff7320b JH |
66 | # OpenSTEP has gcc 2.7.2.1 which recognizes but |
67 | # doesn't implement the -dM flag. | |
8f4f83ba | 68 | && $^O ne 'openstep' && $^O ne 'next' && $^O ne 'darwin' |
8ff7320b | 69 | ) { |
9ae2e8df | 70 | # With the -dM option, gcc outputs every #define it finds |
ee1e7ac2 | 71 | unless(open(FH,"$Config{cc} -E -dM $Config{cppflags} $file |")) { |
9ae2e8df PR |
72 | warn "Cannot open '$file'"; |
73 | return; | |
74 | } | |
eab60bb1 GS |
75 | } else { |
76 | unless(open(FH,"< $file")) { | |
def887e8 | 77 | # This file could be a temporary file created by cppstdin |
6ad8d9a8 GB |
78 | # so only warn under -w, and return |
79 | warn "Cannot open '$file'" if $^W; | |
eab60bb1 GS |
80 | return; |
81 | } | |
82 | } | |
27da23d5 | 83 | |
db5fd395 CN |
84 | if ($^O eq 'MacOS') { |
85 | while(<FH>) { | |
86 | $err{$1} = $2 | |
87 | if /^\s*#\s*define\s+(E\w+)\s+(\d+)/; | |
88 | } | |
89 | } else { | |
90 | while(<FH>) { | |
91 | $err{$1} = 1 | |
92 | if /^\s*#\s*define\s+(E\w+)\s+/; | |
27da23d5 | 93 | if ($IsMSWin32) { |
4d70086c NIS |
94 | $wsa{$1} = 1 |
95 | if /^\s*#\s*define\s+WSA(E\w+)\s+/; | |
96 | } | |
db5fd395 CN |
97 | } |
98 | } | |
27da23d5 | 99 | |
db5fd395 | 100 | close(FH); |
eab60bb1 GS |
101 | } |
102 | ||
def887e8 JH |
103 | my $cppstdin; |
104 | ||
105 | sub default_cpp { | |
106 | unless (defined $cppstdin) { | |
107 | use File::Spec; | |
108 | $cppstdin = $Config{cppstdin}; | |
109 | my $upup_cppstdin = File::Spec->catfile(File::Spec->updir, | |
110 | File::Spec->updir, | |
111 | "cppstdin"); | |
112 | my $cppstdin_is_wrapper = | |
113 | ($cppstdin eq 'cppstdin' | |
114 | and -f $upup_cppstdin | |
115 | and -x $upup_cppstdin); | |
116 | $cppstdin = $upup_cppstdin if $cppstdin_is_wrapper; | |
117 | } | |
118 | return "$cppstdin $Config{cppflags} $Config{cppminus}"; | |
119 | } | |
120 | ||
eab60bb1 GS |
121 | sub get_files { |
122 | my %file = (); | |
123 | # VMS keeps its include files in system libraries (well, except for Gcc) | |
124 | if ($^O eq 'VMS') { | |
125 | if ($Config{vms_cc_type} eq 'decc') { | |
126 | $file{'Sys$Library:DECC$RTLDEF.TLB'} = 1; | |
127 | } elsif ($Config{vms_cc_type} eq 'vaxc') { | |
128 | $file{'Sys$Library:vaxcdef.tlb'} = 1; | |
129 | } elsif ($Config{vms_cc_type} eq 'gcc') { | |
130 | $file{'gnu_cc_include:[000000]errno.h'} = 1; | |
131 | } | |
9d116dd7 JH |
132 | } elsif ($^O eq 'os390') { |
133 | # OS/390 C compiler doesn't generate #file or #line directives | |
134 | $file{'/usr/include/errno.h'} = 1; | |
092bebab JH |
135 | } elsif ($^O eq 'vmesa') { |
136 | # OS/390 C compiler doesn't generate #file or #line directives | |
137 | $file{'../../vmesa/errno.h'} = 1; | |
a367e475 OF |
138 | } elsif ($Config{archname} eq 'epoc') { |
139 | # Watch out for cross compiling for EPOC (usually done on linux) | |
02a99678 | 140 | $file{'/usr/local/epocemx/epocsdk/include/libc/sys/errno.h'} = 1; |
7ee146b1 AW |
141 | } elsif ($Config{archname} eq 'arm-riscos') { |
142 | # Watch out for cross compiling for RISC OS | |
143 | my $dep = `echo "#include <errno.h>" | gcc -E -M -`; | |
144 | if ($dep =~ /(\S+errno\.h)/) { | |
145 | $file{$1} = 1; | |
146 | } | |
022394cf | 147 | } elsif ($^O eq 'linux' && |
65a03812 | 148 | $Config{gccversion} ne '' && |
e9014798 SP |
149 | $Config{gccversion} !~ /intel/i |
150 | # might be using, say, Intel's icc | |
022394cf | 151 | ) { |
9ae2e8df PR |
152 | # Some Linuxes have weird errno.hs which generate |
153 | # no #file or #line directives | |
a148bc21 DK |
154 | my $linux_errno_h = -e '/usr/include/errno.h' ? |
155 | '/usr/include/errno.h' : '/usr/local/include/errno.h'; | |
156 | $file{$linux_errno_h} = 1; | |
db5fd395 CN |
157 | } elsif ($^O eq 'MacOS') { |
158 | # note that we are only getting the GUSI errno's here ... | |
159 | # we might miss out on compiler-specific ones | |
160 | $file{"$ENV{GUSI}include:sys:errno.h"} = 1; | |
161 | ||
df00ff3b | 162 | } elsif ($^O eq 'beos' || $^O eq 'haiku') { |
0d3cd356 JH |
163 | # hidden in a special place |
164 | $file{'/boot/develop/headers/posix/errno.h'} = 1; | |
165 | ||
196918b0 PG |
166 | } elsif ($^O eq 'vos') { |
167 | # avoid problem where cpp returns non-POSIX pathnames | |
168 | $file{'/system/include_library/errno.h'} = 1; | |
27da23d5 JH |
169 | } elsif ($IsSymbian) { |
170 | my $SDK = $ENV{SDK}; | |
171 | $SDK =~ s!\\!/!g; | |
172 | $file{"$SDK/epoc32/include/libc/sys/errno.h"} = 1; | |
eab60bb1 GS |
173 | } else { |
174 | open(CPPI,"> errno.c") or | |
175 | die "Cannot open errno.c"; | |
176 | ||
2986a63f | 177 | if ($^O eq 'NetWare') { |
c623ac67 | 178 | print CPPI "#include <nwerrno.h>\n"; |
2986a63f | 179 | } else { |
c623ac67 | 180 | print CPPI "#include <errno.h>\n"; |
27da23d5 | 181 | if ($IsMSWin32) { |
c623ac67 GS |
182 | print CPPI "#define _WINSOCKAPI_\n"; # don't drag in everything |
183 | print CPPI "#include <winsock.h>\n"; | |
184 | } | |
2986a63f | 185 | } |
eab60bb1 GS |
186 | |
187 | close(CPPI); | |
188 | ||
189 | # invoke CPP and read the output | |
27da23d5 | 190 | if ($IsMSWin32 || $^O eq 'NetWare') { |
6ad8d9a8 GB |
191 | open(CPPO,"$Config{cpprun} $Config{cppflags} errno.c |") or |
192 | die "Cannot run '$Config{cpprun} $Config{cppflags} errno.c'"; | |
193 | } else { | |
def887e8 | 194 | my $cpp = default_cpp(); |
6ad8d9a8 GB |
195 | open(CPPO,"$cpp < errno.c |") or |
196 | die "Cannot exec $cpp"; | |
197 | } | |
eab60bb1 GS |
198 | |
199 | my $pat; | |
27da23d5 | 200 | if (($IsMSWin32 || $^O eq 'NetWare') and $Config{cc} =~ /^bcc/i) { |
eab60bb1 GS |
201 | $pat = '^/\*\s+(.+)\s+\d+\s*:\s+\*/'; |
202 | } | |
203 | else { | |
d0d1d9b9 | 204 | $pat = '^#\s*(?:line)?\s*\d+\s+"([^"]+)"'; |
eab60bb1 GS |
205 | } |
206 | while(<CPPO>) { | |
27da23d5 | 207 | if ($^O eq 'os2' or $IsMSWin32 or $^O eq 'NetWare') { |
0196e43b IZ |
208 | if (/$pat/o) { |
209 | my $f = $1; | |
210 | $f =~ s,\\\\,/,g; | |
211 | $file{$f} = 1; | |
212 | } | |
213 | } | |
214 | else { | |
215 | $file{$1} = 1 if /$pat/o; | |
216 | } | |
eab60bb1 GS |
217 | } |
218 | close(CPPO); | |
219 | } | |
220 | return keys %file; | |
221 | } | |
222 | ||
223 | sub write_errno_pm { | |
224 | my $err; | |
225 | ||
def887e8 JH |
226 | # quick sanity check |
227 | ||
228 | die "No error definitions found" unless keys %err; | |
229 | ||
eab60bb1 GS |
230 | # create the CPP input |
231 | ||
232 | open(CPPI,"> errno.c") or | |
233 | die "Cannot open errno.c"; | |
234 | ||
2986a63f | 235 | if ($^O eq 'NetWare') { |
4d70086c NIS |
236 | print CPPI "#include <nwerrno.h>\n"; |
237 | } | |
238 | else { | |
239 | print CPPI "#include <errno.h>\n"; | |
240 | } | |
27da23d5 | 241 | if ($IsMSWin32) { |
4d70086c NIS |
242 | print CPPI "#include <winsock.h>\n"; |
243 | foreach $err (keys %wsa) { | |
244 | print CPPI "#ifndef $err\n"; | |
245 | print CPPI "#define $err WSA$err\n"; | |
246 | print CPPI "#endif\n"; | |
247 | $err{$err} = 1; | |
2986a63f | 248 | } |
4d70086c NIS |
249 | } |
250 | ||
eab60bb1 GS |
251 | foreach $err (keys %err) { |
252 | print CPPI '"',$err,'" [[',$err,']]',"\n"; | |
253 | } | |
254 | ||
255 | close(CPPI); | |
256 | ||
dbc1d986 | 257 | unless ($^O eq 'MacOS' || $^O eq 'beos') { # trust what we have / get later |
eab60bb1 | 258 | # invoke CPP and read the output |
dcbf900d | 259 | |
db5fd395 CN |
260 | if ($^O eq 'VMS') { |
261 | my $cpp = "$Config{cppstdin} $Config{cppflags} $Config{cppminus}"; | |
262 | $cpp =~ s/sys\$input//i; | |
263 | open(CPPO,"$cpp errno.c |") or | |
264 | die "Cannot exec $Config{cppstdin}"; | |
27da23d5 | 265 | } elsif ($IsMSWin32 || $^O eq 'NetWare') { |
db5fd395 CN |
266 | open(CPPO,"$Config{cpprun} $Config{cppflags} errno.c |") or |
267 | die "Cannot run '$Config{cpprun} $Config{cppflags} errno.c'"; | |
27da23d5 JH |
268 | } elsif ($IsSymbian) { |
269 | my $cpp = "gcc -E -I$ENV{SDK}\\epoc32\\include\\libc -"; | |
270 | open(CPPO,"$cpp < errno.c |") | |
271 | or die "Cannot exec $cpp"; | |
272 | } else { | |
db5fd395 CN |
273 | my $cpp = default_cpp(); |
274 | open(CPPO,"$cpp < errno.c |") | |
275 | or die "Cannot exec $cpp"; | |
276 | } | |
eab60bb1 | 277 | |
db5fd395 | 278 | %err = (); |
eab60bb1 | 279 | |
db5fd395 CN |
280 | while(<CPPO>) { |
281 | my($name,$expr); | |
282 | next unless ($name, $expr) = /"(.*?)"\s*\[\s*\[\s*(.*?)\s*\]\s*\]/; | |
283 | next if $name eq $expr; | |
a633c72b | 284 | $expr =~ s/\(?\([a-z_]\w*\)([^\)]*)\)?/$1/i; # ((type)0xcafebabe) at alia |
99228ec2 MB |
285 | $expr =~ s/((?:0x)?[0-9a-fA-F]+)[LU]+\b/$1/g; # 2147483647L et alia |
286 | next if $expr =~ m/^[a-zA-Z]+$/; # skip some Win32 functions | |
287 | if($expr =~ m/^0[xX]/) { | |
288 | $err{$name} = hex $expr; | |
289 | } | |
290 | else { | |
db5fd395 CN |
291 | $err{$name} = eval $expr; |
292 | } | |
99228ec2 MB |
293 | delete $err{$name} unless defined $err{$name}; |
294 | } | |
db5fd395 | 295 | close(CPPO); |
eab60bb1 | 296 | } |
eab60bb1 | 297 | |
7bf567bf JH |
298 | # Many of the E constants (including ENOENT, which is being |
299 | # used in the Perl test suite a lot), are available only as | |
300 | # enums in BeOS, so compiling and executing some code is about | |
dbc1d986 IW |
301 | # only way to find out what the numeric Evalues are. In fact above, we |
302 | # didn't even bother to get the values of the ones that have numeric | |
303 | # values, since we can get all of them here, anyway. | |
7bf567bf JH |
304 | |
305 | if ($^O eq 'beos') { | |
306 | if (open(C, ">errno.c")) { | |
dbc1d986 | 307 | my @allerrs = keys %err; |
7bf567bf JH |
308 | print C <<EOF; |
309 | #include <errno.h> | |
310 | #include <stdio.h> | |
311 | int main() { | |
312 | EOF | |
dbc1d986 | 313 | for (@allerrs) { |
7bf567bf JH |
314 | print C qq[printf("$_ %d\n", $_);] |
315 | } | |
316 | print C "}\n"; | |
317 | close C; | |
318 | system("cc -o errno errno.c"); | |
319 | unlink("errno.c"); | |
320 | if (open(C, "./errno|")) { | |
321 | while (<C>) { | |
322 | if (/^(\w+) (-?\d+)$/) { $err{$1} = $2 } | |
323 | } | |
324 | close(C); | |
325 | } else { | |
326 | die "failed to execute ./errno: $!\n"; | |
327 | } | |
328 | unlink("errno"); | |
329 | } else { | |
330 | die "failed to create errno.c: $!\n"; | |
331 | } | |
332 | } | |
333 | ||
eab60bb1 GS |
334 | # Write Errno.pm |
335 | ||
336 | print <<"EDQ"; | |
8f8c2a44 | 337 | # -*- buffer-read-only: t -*- |
eab60bb1 GS |
338 | # |
339 | # This file is auto-generated. ***ANY*** changes here will be lost | |
340 | # | |
341 | ||
342 | package Errno; | |
8f8c2a44 | 343 | require Exporter; |
eab60bb1 GS |
344 | use Config; |
345 | use strict; | |
346 | ||
8bc9d590 JH |
347 | "\$Config{'archname'}-\$Config{'osvers'}" eq |
348 | "$Config{'archname'}-$Config{'osvers'}" or | |
81be85b8 | 349 | die "Errno architecture ($Config{'archname'}-$Config{'osvers'}) does not match executable architecture (\$Config{'archname'}-\$Config{'osvers'})"; |
eab60bb1 | 350 | |
8f8c2a44 | 351 | our \$VERSION = "$VERSION"; |
105cd853 | 352 | \$VERSION = eval \$VERSION; |
8f8c2a44 | 353 | our \@ISA = 'Exporter'; |
eab60bb1 | 354 | |
42607a60 NC |
355 | my %err; |
356 | ||
357 | BEGIN { | |
358 | %err = ( | |
eab60bb1 | 359 | EDQ |
be54382c CJ |
360 | |
361 | my @err = sort { $err{$a} <=> $err{$b} } | |
362 | grep { $err{$_} =~ /-?\d+$/ } keys %err; | |
eab60bb1 | 363 | |
42607a60 NC |
364 | foreach $err (@err) { |
365 | print "\t$err => $err{$err},\n"; | |
366 | } | |
eab60bb1 GS |
367 | |
368 | print <<'ESQ'; | |
42607a60 NC |
369 | ); |
370 | # Generate proxy constant subroutines for all the values. | |
371 | # We assume at this point that our symbol table is empty. | |
372 | # Doing this before defining @EXPORT_OK etc means that even if a platform is | |
373 | # crazy enough to define EXPORT_OK as an error constant, everything will | |
374 | # still work, because the parser will upgrade the PCS to a real typeglob. | |
375 | # We rely on the subroutine definitions below to update the internal caches. | |
376 | # Don't use %each, as we don't want a copy of the value. | |
377 | foreach my $name (keys %err) { | |
378 | $Errno::{$name} = \$err{$name}; | |
379 | } | |
380 | } | |
381 | ||
8f8c2a44 | 382 | our @EXPORT_OK = keys %err; |
42607a60 | 383 | |
8f8c2a44 | 384 | our %EXPORT_TAGS = ( |
eab60bb1 GS |
385 | POSIX => [qw( |
386 | ESQ | |
387 | ||
388 | my $k = join(" ", grep { exists $err{$_} } | |
389 | qw(E2BIG EACCES EADDRINUSE EADDRNOTAVAIL EAFNOSUPPORT | |
390 | EAGAIN EALREADY EBADF EBUSY ECHILD ECONNABORTED | |
391 | ECONNREFUSED ECONNRESET EDEADLK EDESTADDRREQ EDOM EDQUOT | |
392 | EEXIST EFAULT EFBIG EHOSTDOWN EHOSTUNREACH EINPROGRESS | |
393 | EINTR EINVAL EIO EISCONN EISDIR ELOOP EMFILE EMLINK | |
394 | EMSGSIZE ENAMETOOLONG ENETDOWN ENETRESET ENETUNREACH | |
395 | ENFILE ENOBUFS ENODEV ENOENT ENOEXEC ENOLCK ENOMEM | |
396 | ENOPROTOOPT ENOSPC ENOSYS ENOTBLK ENOTCONN ENOTDIR | |
397 | ENOTEMPTY ENOTSOCK ENOTTY ENXIO EOPNOTSUPP EPERM | |
398 | EPFNOSUPPORT EPIPE EPROCLIM EPROTONOSUPPORT EPROTOTYPE | |
399 | ERANGE EREMOTE ERESTART EROFS ESHUTDOWN ESOCKTNOSUPPORT | |
400 | ESPIPE ESRCH ESTALE ETIMEDOUT ETOOMANYREFS ETXTBSY | |
401 | EUSERS EWOULDBLOCK EXDEV)); | |
402 | ||
403 | $k =~ s/(.{50,70})\s/$1\n\t/g; | |
404 | print "\t",$k,"\n )]\n);\n\n"; | |
405 | ||
eab60bb1 | 406 | print <<'ESQ'; |
42607a60 | 407 | sub TIEHASH { bless \%err } |
eab60bb1 GS |
408 | |
409 | sub FETCH { | |
42607a60 NC |
410 | my (undef, $errname) = @_; |
411 | return "" unless exists $err{$errname}; | |
412 | my $errno = $err{$errname}; | |
413 | return $errno == $! ? $errno : 0; | |
93014de6 | 414 | } |
eab60bb1 GS |
415 | |
416 | sub STORE { | |
417 | require Carp; | |
418 | Carp::confess("ERRNO hash is read only!"); | |
419 | } | |
420 | ||
421 | *CLEAR = \&STORE; | |
422 | *DELETE = \&STORE; | |
423 | ||
424 | sub NEXTKEY { | |
42607a60 | 425 | each %err; |
eab60bb1 GS |
426 | } |
427 | ||
428 | sub FIRSTKEY { | |
42607a60 NC |
429 | my $s = scalar keys %err; # initialize iterator |
430 | each %err; | |
eab60bb1 GS |
431 | } |
432 | ||
433 | sub EXISTS { | |
42607a60 NC |
434 | my (undef, $errname) = @_; |
435 | exists $err{$errname}; | |
eab60bb1 GS |
436 | } |
437 | ||
42607a60 | 438 | tie %!, __PACKAGE__; # Returns an object, objects are true. |
eab60bb1 | 439 | |
eab60bb1 GS |
440 | __END__ |
441 | ||
442 | =head1 NAME | |
443 | ||
444 | Errno - System errno constants | |
445 | ||
446 | =head1 SYNOPSIS | |
447 | ||
448 | use Errno qw(EINTR EIO :POSIX); | |
449 | ||
450 | =head1 DESCRIPTION | |
451 | ||
452 | C<Errno> defines and conditionally exports all the error constants | |
453 | defined in your system C<errno.h> include file. It has a single export | |
454 | tag, C<:POSIX>, which will export all POSIX defined error numbers. | |
455 | ||
93014de6 | 456 | C<Errno> also makes C<%!> magic such that each element of C<%!> has a |
68301627 | 457 | non-zero value only if C<$!> is set to that value. For example: |
eab60bb1 GS |
458 | |
459 | use Errno; | |
3cb6de81 | 460 | |
eab60bb1 GS |
461 | unless (open(FH, "/fangorn/spouse")) { |
462 | if ($!{ENOENT}) { | |
463 | warn "Get a wife!\n"; | |
464 | } else { | |
465 | warn "This path is barred: $!"; | |
466 | } | |
467 | } | |
468 | ||
68301627 GS |
469 | If a specified constant C<EFOO> does not exist on the system, C<$!{EFOO}> |
470 | returns C<"">. You may use C<exists $!{EFOO}> to check whether the | |
93014de6 GS |
471 | constant is available on the system. |
472 | ||
68301627 GS |
473 | =head1 CAVEATS |
474 | ||
475 | Importing a particular constant may not be very portable, because the | |
476 | import will fail on platforms that do not have that constant. A more | |
477 | portable way to set C<$!> to a valid value is to use: | |
478 | ||
479 | if (exists &Errno::EFOO) { | |
480 | $! = &Errno::EFOO; | |
481 | } | |
482 | ||
eab60bb1 GS |
483 | =head1 AUTHOR |
484 | ||
485 | Graham Barr <gbarr@pobox.com> | |
486 | ||
487 | =head1 COPYRIGHT | |
488 | ||
489 | Copyright (c) 1997-8 Graham Barr. All rights reserved. | |
490 | This program is free software; you can redistribute it and/or modify it | |
491 | under the same terms as Perl itself. | |
492 | ||
493 | =cut | |
494 | ||
8f8c2a44 | 495 | # ex: set ro: |
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496 | ESQ |
497 | ||
498 | } |