Commit | Line | Data |
---|---|---|
03c9e98c GS |
1 | use Config; |
2 | ||
3 | sub to_string { | |
4 | my ($value) = @_; | |
146174a9 | 5 | $value =~ s/\\/\\\\/g; |
03c9e98c GS |
6 | $value =~ s/'/\\'/g; |
7 | return "'$value'"; | |
8 | } | |
9 | ||
1c7f9087 VK |
10 | # |
11 | # subroutine expand_os_specific expands $^O-specific preprocessing information | |
12 | # so that it will not be re-calculated at runtime in Dynaloader.pm | |
13 | # | |
14 | # Syntax of preprocessor should be kept extremely simple: | |
15 | # - directives are in double angle brackets <<...>> | |
16 | # - <<=string>> will be just evaluated | |
17 | # - for $^O-specific there are two forms: | |
18 | # <<$^O-eq-osname>> | |
19 | # <<$^O-ne-osname>> | |
20 | # this directive should be closed with respectively | |
21 | # <</$^O-eq-osname>> | |
22 | # <</$^O-ne-osname>> | |
23 | # construct <<|$^O-ne-osname>> means #else | |
24 | # nested <<$^O...>>-constructs are allowed but nested values must be for | |
25 | # different OS-names! | |
26 | # | |
27 | # -- added by VKON, 03-10-2004 to separate $^O-specific between OSes | |
28 | # (so that Win32 never checks for $^O eq 'VMS' for example) | |
27da23d5 JH |
29 | # |
30 | # The $^O tests test both for $^O and for $Config{osname}. | |
31 | # The latter is better for some for cross-compilation setups. | |
32 | # | |
1c7f9087 VK |
33 | sub expand_os_specific { |
34 | my $s = shift; | |
35 | for ($s) { | |
36 | s/<<=(.*?)>>/$1/gee; | |
37 | s/<<\$\^O-(eq|ne)-(\w+)>>(.*?)<<\/\$\^O-\1-\2>>/ | |
38 | my ($op, $os, $expr) = ($1,$2,$3); | |
39 | if ($op ne 'eq' and $op ne 'ne') {die "wrong eq-ne arg in $&"}; | |
40 | if ($expr =~ m[^(.*?)<<\|\$\^O-$op-$os>>(.*?)$]s) { | |
41 | # #if;#else;#endif | |
42 | my ($if,$el) = ($1,$2); | |
27da23d5 | 43 | if (($op eq 'eq' and ($^O eq $os || $Config{osname} eq $os)) || ($op eq 'ne' and ($^O ne $os || $Config{osname} ne $os))) { |
1c7f9087 VK |
44 | $if |
45 | } | |
46 | else { | |
47 | $el | |
48 | } | |
49 | } | |
50 | else { | |
51 | # #if;#endif | |
27da23d5 | 52 | if (($op eq 'eq' and ($^O eq $os || $Config{osname} eq $os)) || ($op eq 'ne' and ($^O ne $os || $Config{osname} ne $os))) { |
1c7f9087 VK |
53 | $expr |
54 | } | |
55 | else { | |
56 | "" | |
57 | } | |
58 | } | |
59 | /ges; | |
60 | if (/<<(=|\$\^O-)/) {die "bad <<\$^O-eq/ne-osname>> expression.". | |
61 | " Unclosed brackets?"; | |
62 | } | |
63 | } | |
64 | $s; | |
65 | } | |
66 | ||
03c9e98c GS |
67 | unlink "DynaLoader.pm" if -f "DynaLoader.pm"; |
68 | open OUT, ">DynaLoader.pm" or die $!; | |
69 | print OUT <<'EOT'; | |
70 | ||
9a51af3b | 71 | # Generated from DynaLoader_pm.PL |
03c9e98c | 72 | |
a0d0e21e LW |
73 | package DynaLoader; |
74 | ||
8e07c86e AD |
75 | # And Gandalf said: 'Many folk like to know beforehand what is to |
76 | # be set on the table; but those who have laboured to prepare the | |
77 | # feast like to keep their secret; for wonder makes the words of | |
78 | # praise louder.' | |
79 | ||
6662521e | 80 | # (Quote from Tolkien suggested by Anno Siegel.) |
8e07c86e AD |
81 | # |
82 | # See pod text at end of file for documentation. | |
83 | # See also ext/DynaLoader/README in source tree for other information. | |
84 | # | |
85 | # Tim.Bunce@ig.co.uk, August 1994 | |
86 | ||
e240c90c RGS |
87 | BEGIN { |
88 | $VERSION = '1.08'; | |
89 | } | |
dc848c6f | 90 | |
dc848c6f | 91 | require AutoLoader; |
92 | *AUTOLOAD = \&AutoLoader::AUTOLOAD; | |
8e07c86e | 93 | |
7e9f3af8 JH |
94 | use Config; |
95 | ||
8e07c86e AD |
96 | # enable debug/trace messages from DynaLoader perl code |
97 | $dl_debug = $ENV{PERL_DL_DEBUG} || 0 unless defined $dl_debug; | |
98 | ||
ff7f3c60 NIS |
99 | # |
100 | # Flags to alter dl_load_file behaviour. Assigned bits: | |
101 | # 0x01 make symbols available for linking later dl_load_file's. | |
102 | # (only known to work on Solaris 2 using dlopen(RTLD_GLOBAL)) | |
f86702cc | 103 | # (ignored under VMS; effect is built-in to image linking) |
ff7f3c60 NIS |
104 | # |
105 | # This is called as a class method $module->dl_load_flags. The | |
106 | # definition here will be inherited and result on "default" loading | |
107 | # behaviour unless a sub-class of DynaLoader defines its own version. | |
108 | # | |
109 | ||
110 | sub dl_load_flags { 0x00 } | |
111 | ||
03c9e98c GS |
112 | # ($dl_dlext, $dlsrc) |
113 | # = @Config::Config{'dlext', 'dlsrc'}; | |
114 | EOT | |
115 | ||
1c7f9087 VK |
116 | $dl_dlext = $Config::Config{'dlext'}; |
117 | $dl_so = $Config::Config{'so'}; | |
118 | print OUT " (\$dl_dlext, \$dlsrc) = ('$dl_dlext', ", | |
119 | to_string($Config::Config{'dlsrc'}), ")\n;"; | |
ff7f3c60 | 120 | |
1c7f9087 | 121 | print OUT expand_os_specific(<<'EOT'); |
8e07c86e | 122 | |
1c7f9087 | 123 | <<$^O-eq-VMS>> |
8e07c86e AD |
124 | # Some systems need special handling to expand file specifications |
125 | # (VMS support by Charles Bailey <bailey@HMIVAX.HUMGEN.UPENN.EDU>) | |
126 | # See dl_expandspec() for more details. Should be harmless but | |
127 | # inefficient to define on systems that don't need it. | |
632a9a7f | 128 | $Is_VMS = $^O eq 'VMS'; |
1c7f9087 VK |
129 | <</$^O-eq-VMS>> |
130 | $do_expand = <<$^O-eq-VMS>>1<<|$^O-eq-VMS>>0<</$^O-eq-VMS>>; | |
8e07c86e | 131 | |
1c7f9087 | 132 | <<$^O-eq-MacOS>> |
d5201bd2 | 133 | my $Mac_FS; |
1c7f9087 VK |
134 | $Mac_FS = eval { require Mac::FileSpec::Unixish }; |
135 | <</$^O-eq-MacOS>> | |
d5201bd2 | 136 | |
8e07c86e AD |
137 | @dl_require_symbols = (); # names of symbols we need |
138 | @dl_resolve_using = (); # names of files to link with | |
139 | @dl_library_path = (); # path to look for files | |
bff25830 DM |
140 | |
141 | #XSLoader.pm may have added elements before we were required | |
89166d32 | 142 | #@dl_shared_objects = (); # shared objects for symbols we have |
bff25830 DM |
143 | #@dl_librefs = (); # things we have loaded |
144 | #@dl_modules = (); # Modules we have loaded | |
8e07c86e AD |
145 | |
146 | # This is a fix to support DLD's unfortunate desire to relink -lc | |
147 | @dl_resolve_using = dl_findfile('-lc') if $dlsrc eq "dl_dld.xs"; | |
148 | ||
d0a5ed9f | 149 | EOT |
03c9e98c | 150 | |
d0a5ed9f | 151 | my $cfg_dl_library_path = <<'EOT'; |
632a9a7f | 152 | push(@dl_library_path, split(' ', $Config::Config{libpth})); |
03c9e98c GS |
153 | EOT |
154 | ||
d0a5ed9f | 155 | sub dquoted_comma_list { |
1c7f9087 | 156 | join(", ", map {'"'.quotemeta($_).'"'} @_); |
d0a5ed9f | 157 | } |
03c9e98c | 158 | |
d0a5ed9f JH |
159 | if ($ENV{PERL_BUILD_EXPAND_CONFIG_VARS}) { |
160 | eval $cfg_dl_library_path; | |
161 | if (!$ENV{PERL_BUILD_EXPAND_ENV_VARS}) { | |
162 | my $dl_library_path = dquoted_comma_list(@dl_library_path); | |
163 | print OUT <<EOT; | |
7e9f3af8 | 164 | # The below \@dl_library_path has been expanded (%Config) in Perl build time. |
d0a5ed9f JH |
165 | |
166 | \@dl_library_path = ($dl_library_path); | |
167 | ||
168 | EOT | |
169 | } | |
170 | } | |
171 | else { | |
172 | print OUT <<EOT; | |
173 | # Initialise \@dl_library_path with the 'standard' library path | |
174 | # for this platform as determined by Configure. | |
175 | ||
176 | $cfg_dl_library_path | |
177 | ||
178 | EOT | |
179 | } | |
8e07c86e | 180 | |
8225e35f | 181 | my $ldlibpthname; |
7e9f3af8 | 182 | my $ldlibpthname_defined; |
8225e35f JH |
183 | my $pthsep; |
184 | ||
185 | if ($ENV{PERL_BUILD_EXPAND_CONFIG_VARS}) { | |
1c7f9087 VK |
186 | $ldlibpthname = to_string($Config::Config{ldlibpthname}); |
187 | $ldlibpthname_defined = to_string(defined $Config::Config{ldlibpthname} ? 1 : 0); | |
188 | $pthsep = to_string($Config::Config{path_sep}); | |
8225e35f JH |
189 | } |
190 | else { | |
7e9f3af8 JH |
191 | $ldlibpthname = q($Config::Config{ldlibpthname}); |
192 | $ldlibpthname_defined = q(defined $Config::Config{ldlibpthname}); | |
193 | $pthsep = q($Config::Config{path_sep}); | |
1c7f9087 VK |
194 | } |
195 | print OUT <<EOT; | |
7e9f3af8 JH |
196 | my \$ldlibpthname = $ldlibpthname; |
197 | my \$ldlibpthname_defined = $ldlibpthname_defined; | |
198 | my \$pthsep = $pthsep; | |
8225e35f JH |
199 | |
200 | EOT | |
8225e35f | 201 | |
7e9f3af8 JH |
202 | my $env_dl_library_path = <<'EOT'; |
203 | if ($ldlibpthname_defined && | |
204 | exists $ENV{$ldlibpthname}) { | |
205 | push(@dl_library_path, split(/$pthsep/, $ENV{$ldlibpthname})); | |
8225e35f JH |
206 | } |
207 | ||
5cf1d1f1 | 208 | # E.g. HP-UX supports both its native SHLIB_PATH *and* LD_LIBRARY_PATH. |
8225e35f | 209 | |
7e9f3af8 JH |
210 | if ($ldlibpthname_defined && |
211 | $ldlibpthname ne 'LD_LIBRARY_PATH' && | |
212 | exists $ENV{LD_LIBRARY_PATH}) { | |
213 | push(@dl_library_path, split(/$pthsep/, $ENV{LD_LIBRARY_PATH})); | |
d0a5ed9f | 214 | } |
e6197cab NC |
215 | EOT |
216 | ||
d0a5ed9f JH |
217 | if ($ENV{PERL_BUILD_EXPAND_CONFIG_VARS} && $ENV{PERL_BUILD_EXPAND_ENV_VARS}) { |
218 | eval $env_dl_library_path; | |
e6197cab | 219 | } |
d0a5ed9f JH |
220 | else { |
221 | print OUT <<EOT; | |
222 | # Add to \@dl_library_path any extra directories we can gather from environment | |
223 | # during runtime. | |
e6197cab | 224 | |
d0a5ed9f JH |
225 | $env_dl_library_path |
226 | ||
227 | EOT | |
e6197cab NC |
228 | } |
229 | ||
d0a5ed9f JH |
230 | if ($ENV{PERL_BUILD_EXPAND_CONFIG_VARS} && $ENV{PERL_BUILD_EXPAND_ENV_VARS}) { |
231 | my $dl_library_path = dquoted_comma_list(@dl_library_path); | |
232 | print OUT <<EOT; | |
7e9f3af8 JH |
233 | # The below \@dl_library_path has been expanded (%Config, %ENV) |
234 | # in Perl build time. | |
d0a5ed9f JH |
235 | |
236 | \@dl_library_path = ($dl_library_path); | |
237 | ||
238 | EOT | |
146174a9 | 239 | } |
8e07c86e | 240 | |
1c7f9087 VK |
241 | |
242 | # following long string contains $^O-specific stuff, which is factored out | |
243 | print OUT expand_os_specific(<<'EOT'); | |
8e07c86e | 244 | # No prizes for guessing why we don't say 'bootstrap DynaLoader;' here. |
b4cea227 | 245 | # NOTE: All dl_*.xs (including dl_none.xs) define a dl_error() XSUB |
bb3913c7 | 246 | boot_DynaLoader('DynaLoader') if defined(&boot_DynaLoader) && |
b4cea227 | 247 | !defined(&dl_error); |
8e07c86e AD |
248 | |
249 | if ($dl_debug) { | |
250 | print STDERR "DynaLoader.pm loaded (@INC, @dl_library_path)\n"; | |
251 | print STDERR "DynaLoader not linked into this perl\n" | |
252 | unless defined(&boot_DynaLoader); | |
253 | } | |
254 | ||
255 | 1; # End of main code | |
256 | ||
257 | ||
fb73857a | 258 | sub croak { require Carp; Carp::croak(@_) } |
259 | ||
146174a9 CB |
260 | sub bootstrap_inherit { |
261 | my $module = $_[0]; | |
262 | local *isa = *{"$module\::ISA"}; | |
263 | local @isa = (@isa, 'DynaLoader'); | |
264 | # Cannot goto due to delocalization. Will report errors on a wrong line? | |
265 | bootstrap(@_); | |
266 | } | |
267 | ||
8e07c86e AD |
268 | # The bootstrap function cannot be autoloaded (without complications) |
269 | # so we define it here: | |
270 | ||
271 | sub bootstrap { | |
272 | # use local vars to enable $module.bs script to edit values | |
273 | local(@args) = @_; | |
274 | local($module) = $args[0]; | |
275 | local(@dirs, $file); | |
276 | ||
fb73857a | 277 | unless ($module) { |
278 | require Carp; | |
279 | Carp::confess("Usage: DynaLoader::bootstrap(module)"); | |
280 | } | |
8e07c86e AD |
281 | |
282 | # A common error on platforms which don't support dynamic loading. | |
283 | # Since it's fatal and potentially confusing we give a detailed message. | |
fb73857a | 284 | croak("Can't load module $module, dynamic loading not available in this perl.\n". |
8e07c86e AD |
285 | " (You may need to build a new perl executable which either supports\n". |
286 | " dynamic loading or has the $module module statically linked into it.)\n") | |
287 | unless defined(&dl_load_file); | |
288 | ||
59ad941d | 289 | |
1c7f9087 | 290 | <<$^O-eq-os2>> |
59ad941d IZ |
291 | # Can dynaload, but cannot dynaload Perl modules... |
292 | die 'Dynaloaded Perl modules are not available in this build of Perl' if $OS2::is_static; | |
293 | ||
1c7f9087 | 294 | <</$^O-eq-os2>> |
8e07c86e AD |
295 | my @modparts = split(/::/,$module); |
296 | my $modfname = $modparts[-1]; | |
297 | ||
298 | # Some systems have restrictions on files names for DLL's etc. | |
299 | # mod2fname returns appropriate file base name (typically truncated) | |
300 | # It may also edit @modparts if required. | |
301 | $modfname = &mod2fname(\@modparts) if defined &mod2fname; | |
302 | ||
1c7f9087 | 303 | <<$^O-eq-NetWare>> |
1a95e36d | 304 | # Truncate the module name to 8.3 format for NetWare |
1c7f9087 | 305 | if ((length($modfname) > 8)) { |
f355267c JH |
306 | $modfname = substr($modfname, 0, 8); |
307 | } | |
1c7f9087 | 308 | <</$^O-eq-NetWare>> |
f355267c | 309 | |
1c7f9087 | 310 | my $modpname = join(<<$^O-eq-MacOS>>':'<<|$^O-eq-MacOS>>'/'<</$^O-eq-MacOS>>,@modparts); |
8e07c86e AD |
311 | |
312 | print STDERR "DynaLoader::bootstrap for $module ", | |
1c7f9087 VK |
313 | <<$^O-eq-MacOS>> "(:auto:$modpname:$modfname.<<=$dl_dlext>>)\n" |
314 | <<|$^O-eq-MacOS>>"(auto/$modpname/$modfname.<<=$dl_dlext>>)\n"<</$^O-eq-MacOS>> | |
146174a9 | 315 | if $dl_debug; |
8e07c86e AD |
316 | |
317 | foreach (@INC) { | |
1c7f9087 VK |
318 | <<$^O-eq-VMS>>chop($_ = VMS::Filespec::unixpath($_));<</$^O-eq-VMS>> |
319 | <<$^O-eq-MacOS>> | |
e69a2255 | 320 | my $path = $_; |
5b865721 | 321 | if ($Mac_FS && ! -d $path) { |
d5201bd2 JH |
322 | $path = Mac::FileSpec::Unixish::nativize($path); |
323 | } | |
e69a2255 | 324 | $path .= ":" unless /:$/; |
1c7f9087 VK |
325 | my $dir = "${path}auto:$modpname"; |
326 | <<|$^O-eq-MacOS>> | |
327 | my $dir = "$_/auto/$modpname"; | |
328 | <</$^O-eq-MacOS>> | |
1a95e36d JH |
329 | |
330 | next unless -d $dir; # skip over uninteresting directories | |
331 | ||
8e07c86e | 332 | # check for common cases to avoid autoload of dl_findfile |
1c7f9087 VK |
333 | my $try = <<$^O-eq-MacOS>> "$dir:$modfname.<<=$dl_dlext>>" <<|$^O-eq-MacOS>> "$dir/$modfname.<<=$dl_dlext>>"<</$^O-eq-MacOS>>; |
334 | last if $file = <<$^O-eq-VMS>>($do_expand) ? dl_expandspec($try) : ((-f $try) && $try); | |
335 | <<|$^O-eq-VMS>>(-f $try) && $try; | |
336 | <</$^O-eq-VMS>> | |
1a95e36d | 337 | |
8e07c86e | 338 | # no luck here, save dir for possible later dl_findfile search |
fb73857a | 339 | push @dirs, $dir; |
8e07c86e AD |
340 | } |
341 | # last resort, let dl_findfile have a go in all known locations | |
fb73857a | 342 | $file = dl_findfile(map("-L$_",@dirs,@INC), $modfname) unless $file; |
8e07c86e | 343 | |
fb73857a | 344 | croak("Can't locate loadable object for module $module in \@INC (\@INC contains: @INC)") |
345 | unless $file; # wording similar to error from 'require' | |
8e07c86e | 346 | |
1c7f9087 | 347 | <<$^O-eq-VMS>>$file = uc($file) if $Config::Config{d_vms_case_sensitive_symbols};<</$^O-eq-VMS>> |
8e07c86e AD |
348 | my $bootname = "boot_$module"; |
349 | $bootname =~ s/\W/_/g; | |
350 | @dl_require_symbols = ($bootname); | |
351 | ||
352 | # Execute optional '.bootstrap' perl script for this module. | |
353 | # The .bs file can be used to configure @dl_resolve_using etc to | |
354 | # match the needs of the individual module on this architecture. | |
355 | my $bs = $file; | |
3f45a6dd | 356 | $bs =~ s/(\.\w+)?(;\d*)?$/\.bs/; # look for .bs 'beside' the library |
8e07c86e | 357 | if (-s $bs) { # only read file if it's not empty |
d404d5bf | 358 | print STDERR "BS: $bs ($^O, $dlsrc)\n" if $dl_debug; |
8e07c86e AD |
359 | eval { do $bs; }; |
360 | warn "$bs: $@\n" if $@; | |
361 | } | |
362 | ||
588cafc8 DM |
363 | my $boot_symbol_ref; |
364 | ||
1c7f9087 VK |
365 | <<$^O-eq-darwin>> |
366 | if ($boot_symbol_ref = dl_find_symbol(0, $bootname)) { | |
367 | goto boot; #extension library has already been loaded, e.g. darwin | |
588cafc8 | 368 | } |
1c7f9087 | 369 | <</$^O-eq-darwin>> |
588cafc8 | 370 | |
8e07c86e AD |
371 | # Many dynamic extension loading problems will appear to come from |
372 | # this section of code: XYZ failed at line 123 of DynaLoader.pm. | |
373 | # Often these errors are actually occurring in the initialisation | |
374 | # C code of the extension XS file. Perl reports the error as being | |
375 | # in this perl code simply because this was the last perl code | |
376 | # it executed. | |
377 | ||
ff7f3c60 | 378 | my $libref = dl_load_file($file, $module->dl_load_flags) or |
549a6b10 | 379 | croak("Can't load '$file' for module $module: ".dl_error()); |
8e07c86e | 380 | |
ff7f3c60 NIS |
381 | push(@dl_librefs,$libref); # record loaded object |
382 | ||
8e07c86e | 383 | my @unresolved = dl_undef_symbols(); |
fb73857a | 384 | if (@unresolved) { |
385 | require Carp; | |
386 | Carp::carp("Undefined symbols present after loading $file: @unresolved\n"); | |
387 | } | |
8e07c86e | 388 | |
588cafc8 | 389 | $boot_symbol_ref = dl_find_symbol($libref, $bootname) or |
fb73857a | 390 | croak("Can't find '$bootname' symbol in $file\n"); |
8e07c86e | 391 | |
ff7f3c60 NIS |
392 | push(@dl_modules, $module); # record loaded module |
393 | ||
588cafc8 DM |
394 | boot: |
395 | my $xs = dl_install_xsub("${module}::bootstrap", $boot_symbol_ref, $file); | |
396 | ||
8e07c86e | 397 | # See comment block above |
8cf57410 EP |
398 | |
399 | push(@dl_shared_objects, $file); # record files loaded | |
400 | ||
8e07c86e AD |
401 | &$xs(@args); |
402 | } | |
403 | ||
404 | ||
fb73857a | 405 | #sub _check_file { # private utility to handle dl_expandspec vs -f tests |
406 | # my($file) = @_; | |
407 | # return $file if (!$do_expand && -f $file); # the common case | |
408 | # return $file if ( $do_expand && ($file=dl_expandspec($file))); | |
409 | # return undef; | |
410 | #} | |
8e07c86e AD |
411 | |
412 | ||
413 | # Let autosplit and the autoloader deal with these functions: | |
414 | __END__ | |
415 | ||
416 | ||
417 | sub dl_findfile { | |
418 | # Read ext/DynaLoader/DynaLoader.doc for detailed information. | |
419 | # This function does not automatically consider the architecture | |
420 | # or the perl library auto directories. | |
421 | my (@args) = @_; | |
422 | my (@dirs, $dir); # which directories to search | |
423 | my (@found); # full paths to real files we have found | |
1c7f9087 VK |
424 | #my $dl_ext= <<=to_string($Config::Config{'dlext'})>>; # $Config::Config{'dlext'} suffix for perl extensions |
425 | #my $dl_so = <<=to_string($Config::Config{'so'})>>; # $Config::Config{'so'} suffix for shared libraries | |
8e07c86e AD |
426 | |
427 | print STDERR "dl_findfile(@args)\n" if $dl_debug; | |
428 | ||
429 | # accumulate directories but process files as they appear | |
430 | arg: foreach(@args) { | |
431 | # Special fast case: full filepath requires no search | |
1c7f9087 VK |
432 | <<$^O-eq-VMS>> |
433 | if (m%[:>/\]]% && -f $_) { | |
54d6a3b3 | 434 | push(@found,dl_expandspec(VMS::Filespec::vmsify($_))); |
435 | last arg unless wantarray; | |
436 | next; | |
437 | } | |
1c7f9087 VK |
438 | <</$^O-eq-VMS>> |
439 | <<$^O-eq-MacOS>> | |
146174a9 CB |
440 | if (m/:/ && -f $_) { |
441 | push(@found,$_); | |
442 | last arg unless wantarray; | |
443 | } | |
1c7f9087 VK |
444 | <</$^O-eq-MacOS>> |
445 | <<$^O-ne-VMS>> | |
446 | if (m:/: && -f $_) { | |
8e07c86e AD |
447 | push(@found,$_); |
448 | last arg unless wantarray; | |
449 | next; | |
450 | } | |
1c7f9087 | 451 | <</$^O-ne-VMS>> |
8e07c86e AD |
452 | |
453 | # Deal with directories first: | |
454 | # Using a -L prefix is the preferred option (faster and more robust) | |
455 | if (m:^-L:) { s/^-L//; push(@dirs, $_); next; } | |
456 | ||
1c7f9087 | 457 | <<$^O-eq-MacOS>> |
146174a9 CB |
458 | # Otherwise we try to try to spot directories by a heuristic |
459 | # (this is a more complicated issue than it first appears) | |
460 | if (m/:/ && -d $_) { push(@dirs, $_); next; } | |
461 | # Only files should get this far... | |
462 | my(@names, $name); # what filenames to look for | |
463 | s/^-l//; | |
464 | push(@names, $_); | |
465 | foreach $dir (@dirs, @dl_library_path) { | |
466 | next unless -d $dir; | |
467 | $dir =~ s/^([^:]+)$/:$1/; | |
468 | $dir =~ s/:$//; | |
469 | foreach $name (@names) { | |
470 | my($file) = "$dir:$name"; | |
471 | print STDERR " checking in $dir for $name\n" if $dl_debug; | |
472 | if (-f $file) { | |
473 | push(@found, $file); | |
474 | next arg; # no need to look any further | |
475 | } | |
476 | } | |
477 | } | |
478 | next; | |
1c7f9087 | 479 | <</$^O-eq-MacOS>> |
146174a9 | 480 | |
8e07c86e AD |
481 | # Otherwise we try to try to spot directories by a heuristic |
482 | # (this is a more complicated issue than it first appears) | |
483 | if (m:/: && -d $_) { push(@dirs, $_); next; } | |
484 | ||
1c7f9087 | 485 | <<$^O-eq-VMS>> |
7e9f3af8 | 486 | # VMS: we may be using native VMS directory syntax instead of |
8e07c86e | 487 | # Unix emulation, so check this as well |
1c7f9087 VK |
488 | if (/[:>\]]/ && -d $_) { push(@dirs, $_); next; } |
489 | <</$^O-eq-VMS>> | |
8e07c86e AD |
490 | |
491 | # Only files should get this far... | |
492 | my(@names, $name); # what filenames to look for | |
493 | if (m:-l: ) { # convert -lname to appropriate library name | |
494 | s/-l//; | |
9983c456 | 495 | push(@names,"lib$_.<<=$dl_so>>"); |
8e07c86e AD |
496 | push(@names,"lib$_.a"); |
497 | } else { # Umm, a bare name. Try various alternatives: | |
498 | # these should be ordered with the most likely first | |
1c7f9087 VK |
499 | push(@names,"$_.<<=$dl_dlext>>") unless m/\.<<=$dl_dlext>>$/o; |
500 | push(@names,"$_.<<=$dl_so>>") unless m/\.<<=$dl_so>>$/o; | |
501 | push(@names,"lib$_.<<=$dl_so>>") unless m:/:; | |
8e07c86e AD |
502 | push(@names,"$_.a") if !m/\.a$/ and $dlsrc eq "dl_dld.xs"; |
503 | push(@names, $_); | |
504 | } | |
27da23d5 JH |
505 | my $dirsep = '/'; |
506 | <<$^O-eq-symbian>> | |
507 | $dirsep = '\\'; | |
508 | if ($0 =~ /^([a-z]):/i) { | |
509 | my $drive = $1; | |
510 | @dirs = map { "$drive:$_" } @dirs; | |
511 | @dl_library_path = map { "$drive:$_" } @dl_library_path; | |
512 | } | |
513 | <</$^O-eq-symbian>> | |
8e07c86e AD |
514 | foreach $dir (@dirs, @dl_library_path) { |
515 | next unless -d $dir; | |
1c7f9087 VK |
516 | <<$^O-eq-VMS>> |
517 | chop($dir = VMS::Filespec::unixpath($dir)); | |
518 | <</$^O-eq-VMS>> | |
8e07c86e | 519 | foreach $name (@names) { |
27da23d5 | 520 | my($file) = "$dir$dirsep$name"; |
8e07c86e | 521 | print STDERR " checking in $dir for $name\n" if $dl_debug; |
fb73857a | 522 | $file = ($do_expand) ? dl_expandspec($file) : (-f $file && $file); |
523 | #$file = _check_file($file); | |
8e07c86e AD |
524 | if ($file) { |
525 | push(@found, $file); | |
526 | next arg; # no need to look any further | |
527 | } | |
528 | } | |
529 | } | |
530 | } | |
531 | if ($dl_debug) { | |
532 | foreach(@dirs) { | |
533 | print STDERR " dl_findfile ignored non-existent directory: $_\n" unless -d $_; | |
534 | } | |
535 | print STDERR "dl_findfile found: @found\n"; | |
536 | } | |
537 | return $found[0] unless wantarray; | |
538 | @found; | |
539 | } | |
540 | ||
541 | ||
542 | sub dl_expandspec { | |
543 | my($spec) = @_; | |
544 | # Optional function invoked if DynaLoader.pm sets $do_expand. | |
545 | # Most systems do not require or use this function. | |
546 | # Some systems may implement it in the dl_*.xs file in which case | |
547 | # this autoload version will not be called but is harmless. | |
548 | ||
549 | # This function is designed to deal with systems which treat some | |
550 | # 'filenames' in a special way. For example VMS 'Logical Names' | |
551 | # (something like unix environment variables - but different). | |
552 | # This function should recognise such names and expand them into | |
553 | # full file paths. | |
554 | # Must return undef if $spec is invalid or file does not exist. | |
555 | ||
556 | my $file = $spec; # default output to input | |
557 | ||
1c7f9087 VK |
558 | <<$^O-eq-VMS>> |
559 | # dl_expandspec should be defined in dl_vms.xs | |
fb73857a | 560 | require Carp; |
4633a7c4 | 561 | Carp::croak("dl_expandspec: should be defined in XS file!\n"); |
1c7f9087 | 562 | <<|$^O-eq-VMS>> |
8e07c86e | 563 | return undef unless -f $file; |
1c7f9087 | 564 | <</$^O-eq-VMS>> |
8e07c86e AD |
565 | print STDERR "dl_expandspec($spec) => $file\n" if $dl_debug; |
566 | $file; | |
567 | } | |
568 | ||
ff7f3c60 NIS |
569 | sub dl_find_symbol_anywhere |
570 | { | |
571 | my $sym = shift; | |
572 | my $libref; | |
573 | foreach $libref (@dl_librefs) { | |
574 | my $symref = dl_find_symbol($libref,$sym); | |
575 | return $symref if $symref; | |
576 | } | |
577 | return undef; | |
578 | } | |
8e07c86e | 579 | |
3b35bae3 AD |
580 | =head1 NAME |
581 | ||
582 | DynaLoader - Dynamically load C libraries into Perl code | |
583 | ||
3b35bae3 AD |
584 | =head1 SYNOPSIS |
585 | ||
8e07c86e | 586 | package YourPackage; |
3b35bae3 | 587 | require DynaLoader; |
c2960299 | 588 | @ISA = qw(... DynaLoader ...); |
8e07c86e | 589 | bootstrap YourPackage; |
3b35bae3 | 590 | |
ff7f3c60 NIS |
591 | # optional method for 'global' loading |
592 | sub dl_load_flags { 0x01 } | |
593 | ||
3b35bae3 AD |
594 | |
595 | =head1 DESCRIPTION | |
596 | ||
c2960299 | 597 | This document defines a standard generic interface to the dynamic |
3b35bae3 AD |
598 | linking mechanisms available on many platforms. Its primary purpose is |
599 | to implement automatic dynamic loading of Perl modules. | |
600 | ||
c2960299 AD |
601 | This document serves as both a specification for anyone wishing to |
602 | implement the DynaLoader for a new platform and as a guide for | |
603 | anyone wishing to use the DynaLoader directly in an application. | |
604 | ||
3b35bae3 AD |
605 | The DynaLoader is designed to be a very simple high-level |
606 | interface that is sufficiently general to cover the requirements | |
607 | of SunOS, HP-UX, NeXT, Linux, VMS and other platforms. | |
608 | ||
c2960299 AD |
609 | It is also hoped that the interface will cover the needs of OS/2, NT |
610 | etc and also allow pseudo-dynamic linking (using C<ld -A> at runtime). | |
3b35bae3 AD |
611 | |
612 | It must be stressed that the DynaLoader, by itself, is practically | |
613 | useless for accessing non-Perl libraries because it provides almost no | |
614 | Perl-to-C 'glue'. There is, for example, no mechanism for calling a C | |
03c9e98c | 615 | library function or supplying arguments. A C::DynaLib module |
90248788 | 616 | is available from CPAN sites which performs that function for some |
1f98619c EM |
617 | common system types. And since the year 2000, there's also Inline::C, |
618 | a module that allows you to write Perl subroutines in C. Also available | |
619 | from your local CPAN site. | |
3b35bae3 AD |
620 | |
621 | DynaLoader Interface Summary | |
622 | ||
623 | @dl_library_path | |
624 | @dl_resolve_using | |
625 | @dl_require_symbols | |
626 | $dl_debug | |
ff7f3c60 NIS |
627 | @dl_librefs |
628 | @dl_modules | |
8cf57410 | 629 | @dl_shared_objects |
3b35bae3 AD |
630 | Implemented in: |
631 | bootstrap($modulename) Perl | |
632 | @filepaths = dl_findfile(@names) Perl | |
ff7f3c60 NIS |
633 | $flags = $modulename->dl_load_flags Perl |
634 | $symref = dl_find_symbol_anywhere($symbol) Perl | |
3b35bae3 | 635 | |
ff7f3c60 | 636 | $libref = dl_load_file($filename, $flags) C |
abb9e9dc | 637 | $status = dl_unload_file($libref) C |
3b35bae3 AD |
638 | $symref = dl_find_symbol($libref, $symbol) C |
639 | @symbols = dl_undef_symbols() C | |
640 | dl_install_xsub($name, $symref [, $filename]) C | |
641 | $message = dl_error C | |
642 | ||
643 | =over 4 | |
644 | ||
645 | =item @dl_library_path | |
646 | ||
647 | The standard/default list of directories in which dl_findfile() will | |
648 | search for libraries etc. Directories are searched in order: | |
649 | $dl_library_path[0], [1], ... etc | |
650 | ||
651 | @dl_library_path is initialised to hold the list of 'normal' directories | |
652 | (F</usr/lib>, etc) determined by B<Configure> (C<$Config{'libpth'}>). This should | |
653 | ensure portability across a wide range of platforms. | |
654 | ||
655 | @dl_library_path should also be initialised with any other directories | |
656 | that can be determined from the environment at runtime (such as | |
657 | LD_LIBRARY_PATH for SunOS). | |
658 | ||
659 | After initialisation @dl_library_path can be manipulated by an | |
660 | application using push and unshift before calling dl_findfile(). | |
661 | Unshift can be used to add directories to the front of the search order | |
662 | either to save search time or to override libraries with the same name | |
663 | in the 'normal' directories. | |
664 | ||
665 | The load function that dl_load_file() calls may require an absolute | |
666 | pathname. The dl_findfile() function and @dl_library_path can be | |
667 | used to search for and return the absolute pathname for the | |
668 | library/object that you wish to load. | |
669 | ||
670 | =item @dl_resolve_using | |
671 | ||
672 | A list of additional libraries or other shared objects which can be | |
673 | used to resolve any undefined symbols that might be generated by a | |
674 | later call to load_file(). | |
675 | ||
676 | This is only required on some platforms which do not handle dependent | |
7a2e2cd6 | 677 | libraries automatically. For example the Socket Perl extension |
678 | library (F<auto/Socket/Socket.so>) contains references to many socket | |
679 | functions which need to be resolved when it's loaded. Most platforms | |
680 | will automatically know where to find the 'dependent' library (e.g., | |
681 | F</usr/lib/libsocket.so>). A few platforms need to be told the | |
682 | location of the dependent library explicitly. Use @dl_resolve_using | |
683 | for this. | |
3b35bae3 AD |
684 | |
685 | Example usage: | |
686 | ||
687 | @dl_resolve_using = dl_findfile('-lsocket'); | |
688 | ||
689 | =item @dl_require_symbols | |
690 | ||
691 | A list of one or more symbol names that are in the library/object file | |
692 | to be dynamically loaded. This is only required on some platforms. | |
693 | ||
ff7f3c60 NIS |
694 | =item @dl_librefs |
695 | ||
696 | An array of the handles returned by successful calls to dl_load_file(), | |
697 | made by bootstrap, in the order in which they were loaded. | |
698 | Can be used with dl_find_symbol() to look for a symbol in any of | |
699 | the loaded files. | |
700 | ||
701 | =item @dl_modules | |
702 | ||
703 | An array of module (package) names that have been bootstrap'ed. | |
704 | ||
8cf57410 EP |
705 | =item @dl_shared_objects |
706 | ||
707 | An array of file names for the shared objects that were loaded. | |
708 | ||
3b35bae3 AD |
709 | =item dl_error() |
710 | ||
711 | Syntax: | |
712 | ||
713 | $message = dl_error(); | |
714 | ||
715 | Error message text from the last failed DynaLoader function. Note | |
716 | that, similar to errno in unix, a successful function call does not | |
717 | reset this message. | |
718 | ||
719 | Implementations should detect the error as soon as it occurs in any of | |
720 | the other functions and save the corresponding message for later | |
721 | retrieval. This will avoid problems on some platforms (such as SunOS) | |
722 | where the error message is very temporary (e.g., dlerror()). | |
723 | ||
724 | =item $dl_debug | |
725 | ||
726 | Internal debugging messages are enabled when $dl_debug is set true. | |
727 | Currently setting $dl_debug only affects the Perl side of the | |
728 | DynaLoader. These messages should help an application developer to | |
729 | resolve any DynaLoader usage problems. | |
730 | ||
731 | $dl_debug is set to C<$ENV{'PERL_DL_DEBUG'}> if defined. | |
732 | ||
733 | For the DynaLoader developer/porter there is a similar debugging | |
734 | variable added to the C code (see dlutils.c) and enabled if Perl was | |
735 | built with the B<-DDEBUGGING> flag. This can also be set via the | |
736 | PERL_DL_DEBUG environment variable. Set to 1 for minimal information or | |
737 | higher for more. | |
738 | ||
739 | =item dl_findfile() | |
740 | ||
741 | Syntax: | |
742 | ||
743 | @filepaths = dl_findfile(@names) | |
744 | ||
745 | Determine the full paths (including file suffix) of one or more | |
746 | loadable files given their generic names and optionally one or more | |
747 | directories. Searches directories in @dl_library_path by default and | |
748 | returns an empty list if no files were found. | |
749 | ||
750 | Names can be specified in a variety of platform independent forms. Any | |
751 | names in the form B<-lname> are converted into F<libname.*>, where F<.*> is | |
752 | an appropriate suffix for the platform. | |
753 | ||
754 | If a name does not already have a suitable prefix and/or suffix then | |
755 | the corresponding file will be searched for by trying combinations of | |
756 | prefix and suffix appropriate to the platform: "$name.o", "lib$name.*" | |
757 | and "$name". | |
758 | ||
759 | If any directories are included in @names they are searched before | |
c2960299 AD |
760 | @dl_library_path. Directories may be specified as B<-Ldir>. Any other |
761 | names are treated as filenames to be searched for. | |
3b35bae3 AD |
762 | |
763 | Using arguments of the form C<-Ldir> and C<-lname> is recommended. | |
764 | ||
765 | Example: | |
766 | ||
767 | @dl_resolve_using = dl_findfile(qw(-L/usr/5lib -lposix)); | |
768 | ||
769 | ||
770 | =item dl_expandspec() | |
771 | ||
772 | Syntax: | |
773 | ||
774 | $filepath = dl_expandspec($spec) | |
775 | ||
776 | Some unusual systems, such as VMS, require special filename handling in | |
777 | order to deal with symbolic names for files (i.e., VMS's Logical Names). | |
778 | ||
779 | To support these systems a dl_expandspec() function can be implemented | |
780 | either in the F<dl_*.xs> file or code can be added to the autoloadable | |
c2960299 AD |
781 | dl_expandspec() function in F<DynaLoader.pm>. See F<DynaLoader.pm> for |
782 | more information. | |
3b35bae3 AD |
783 | |
784 | =item dl_load_file() | |
785 | ||
786 | Syntax: | |
787 | ||
ff7f3c60 | 788 | $libref = dl_load_file($filename, $flags) |
3b35bae3 AD |
789 | |
790 | Dynamically load $filename, which must be the path to a shared object | |
791 | or library. An opaque 'library reference' is returned as a handle for | |
792 | the loaded object. Returns undef on error. | |
793 | ||
ff7f3c60 NIS |
794 | The $flags argument to alters dl_load_file behaviour. |
795 | Assigned bits: | |
796 | ||
797 | 0x01 make symbols available for linking later dl_load_file's. | |
798 | (only known to work on Solaris 2 using dlopen(RTLD_GLOBAL)) | |
f86702cc | 799 | (ignored under VMS; this is a normal part of image linking) |
ff7f3c60 | 800 | |
3b35bae3 AD |
801 | (On systems that provide a handle for the loaded object such as SunOS |
802 | and HPUX, $libref will be that handle. On other systems $libref will | |
803 | typically be $filename or a pointer to a buffer containing $filename. | |
804 | The application should not examine or alter $libref in any way.) | |
805 | ||
ff7f3c60 NIS |
806 | This is the function that does the real work. It should use the |
807 | current values of @dl_require_symbols and @dl_resolve_using if required. | |
3b35bae3 AD |
808 | |
809 | SunOS: dlopen($filename) | |
810 | HP-UX: shl_load($filename) | |
811 | Linux: dld_create_reference(@dl_require_symbols); dld_link($filename) | |
812 | NeXT: rld_load($filename, @dl_resolve_using) | |
813 | VMS: lib$find_image_symbol($filename,$dl_require_symbols[0]) | |
814 | ||
ff7f3c60 NIS |
815 | (The dlopen() function is also used by Solaris and some versions of |
816 | Linux, and is a common choice when providing a "wrapper" on other | |
817 | mechanisms as is done in the OS/2 port.) | |
818 | ||
abb9e9dc GS |
819 | =item dl_unload_file() |
820 | ||
821 | Syntax: | |
822 | ||
823 | $status = dl_unload_file($libref) | |
824 | ||
825 | Dynamically unload $libref, which must be an opaque 'library reference' as | |
826 | returned from dl_load_file. Returns one on success and zero on failure. | |
827 | ||
828 | This function is optional and may not necessarily be provided on all platforms. | |
829 | If it is defined, it is called automatically when the interpreter exits for | |
830 | every shared object or library loaded by DynaLoader::bootstrap. All such | |
831 | library references are stored in @dl_librefs by DynaLoader::Bootstrap as it | |
22851543 | 832 | loads the libraries. The files are unloaded in last-in, first-out order. |
abb9e9dc GS |
833 | |
834 | This unloading is usually necessary when embedding a shared-object perl (e.g. | |
835 | one configured with -Duseshrplib) within a larger application, and the perl | |
836 | interpreter is created and destroyed several times within the lifetime of the | |
837 | application. In this case it is possible that the system dynamic linker will | |
838 | unload and then subsequently reload the shared libperl without relocating any | |
839 | references to it from any files DynaLoaded by the previous incarnation of the | |
840 | interpreter. As a result, any shared objects opened by DynaLoader may point to | |
841 | a now invalid 'ghost' of the libperl shared object, causing apparently random | |
842 | memory corruption and crashes. This behaviour is most commonly seen when using | |
843 | Apache and mod_perl built with the APXS mechanism. | |
844 | ||
845 | SunOS: dlclose($libref) | |
846 | HP-UX: ??? | |
847 | Linux: ??? | |
848 | NeXT: ??? | |
849 | VMS: ??? | |
850 | ||
851 | (The dlclose() function is also used by Solaris and some versions of | |
852 | Linux, and is a common choice when providing a "wrapper" on other | |
853 | mechanisms as is done in the OS/2 port.) | |
854 | ||
2307c6d0 | 855 | =item dl_load_flags() |
ff7f3c60 NIS |
856 | |
857 | Syntax: | |
858 | ||
2307c6d0 | 859 | $flags = dl_load_flags $modulename; |
ff7f3c60 NIS |
860 | |
861 | Designed to be a method call, and to be overridden by a derived class | |
862 | (i.e. a class which has DynaLoader in its @ISA). The definition in | |
863 | DynaLoader itself returns 0, which produces standard behavior from | |
864 | dl_load_file(). | |
3b35bae3 AD |
865 | |
866 | =item dl_find_symbol() | |
867 | ||
868 | Syntax: | |
869 | ||
870 | $symref = dl_find_symbol($libref, $symbol) | |
871 | ||
872 | Return the address of the symbol $symbol or C<undef> if not found. If the | |
873 | target system has separate functions to search for symbols of different | |
874 | types then dl_find_symbol() should search for function symbols first and | |
875 | then other types. | |
876 | ||
877 | The exact manner in which the address is returned in $symref is not | |
878 | currently defined. The only initial requirement is that $symref can | |
879 | be passed to, and understood by, dl_install_xsub(). | |
880 | ||
881 | SunOS: dlsym($libref, $symbol) | |
882 | HP-UX: shl_findsym($libref, $symbol) | |
883 | Linux: dld_get_func($symbol) and/or dld_get_symbol($symbol) | |
884 | NeXT: rld_lookup("_$symbol") | |
885 | VMS: lib$find_image_symbol($libref,$symbol) | |
886 | ||
887 | ||
ff7f3c60 NIS |
888 | =item dl_find_symbol_anywhere() |
889 | ||
890 | Syntax: | |
891 | ||
892 | $symref = dl_find_symbol_anywhere($symbol) | |
893 | ||
894 | Applies dl_find_symbol() to the members of @dl_librefs and returns | |
895 | the first match found. | |
896 | ||
3b35bae3 AD |
897 | =item dl_undef_symbols() |
898 | ||
899 | Example | |
900 | ||
901 | @symbols = dl_undef_symbols() | |
902 | ||
903 | Return a list of symbol names which remain undefined after load_file(). | |
904 | Returns C<()> if not known. Don't worry if your platform does not provide | |
c2960299 AD |
905 | a mechanism for this. Most do not need it and hence do not provide it, |
906 | they just return an empty list. | |
3b35bae3 AD |
907 | |
908 | ||
909 | =item dl_install_xsub() | |
910 | ||
911 | Syntax: | |
912 | ||
913 | dl_install_xsub($perl_name, $symref [, $filename]) | |
914 | ||
915 | Create a new Perl external subroutine named $perl_name using $symref as | |
916 | a pointer to the function which implements the routine. This is simply | |
917 | a direct call to newXSUB(). Returns a reference to the installed | |
918 | function. | |
919 | ||
920 | The $filename parameter is used by Perl to identify the source file for | |
921 | the function if required by die(), caller() or the debugger. If | |
922 | $filename is not defined then "DynaLoader" will be used. | |
923 | ||
924 | ||
1fef88e7 | 925 | =item bootstrap() |
3b35bae3 AD |
926 | |
927 | Syntax: | |
928 | ||
929 | bootstrap($module) | |
930 | ||
931 | This is the normal entry point for automatic dynamic loading in Perl. | |
932 | ||
933 | It performs the following actions: | |
934 | ||
935 | =over 8 | |
936 | ||
937 | =item * | |
938 | ||
939 | locates an auto/$module directory by searching @INC | |
940 | ||
941 | =item * | |
942 | ||
943 | uses dl_findfile() to determine the filename to load | |
944 | ||
945 | =item * | |
946 | ||
947 | sets @dl_require_symbols to C<("boot_$module")> | |
948 | ||
949 | =item * | |
950 | ||
951 | executes an F<auto/$module/$module.bs> file if it exists | |
952 | (typically used to add to @dl_resolve_using any files which | |
953 | are required to load the module on the current platform) | |
954 | ||
955 | =item * | |
956 | ||
ff7f3c60 NIS |
957 | calls dl_load_flags() to determine how to load the file. |
958 | ||
959 | =item * | |
960 | ||
3b35bae3 AD |
961 | calls dl_load_file() to load the file |
962 | ||
963 | =item * | |
964 | ||
965 | calls dl_undef_symbols() and warns if any symbols are undefined | |
966 | ||
967 | =item * | |
968 | ||
969 | calls dl_find_symbol() for "boot_$module" | |
970 | ||
971 | =item * | |
972 | ||
973 | calls dl_install_xsub() to install it as "${module}::bootstrap" | |
974 | ||
975 | =item * | |
976 | ||
8e07c86e AD |
977 | calls &{"${module}::bootstrap"} to bootstrap the module (actually |
978 | it uses the function reference returned by dl_install_xsub for speed) | |
3b35bae3 AD |
979 | |
980 | =back | |
981 | ||
982 | =back | |
983 | ||
984 | ||
985 | =head1 AUTHOR | |
986 | ||
c2960299 AD |
987 | Tim Bunce, 11 August 1994. |
988 | ||
3b35bae3 AD |
989 | This interface is based on the work and comments of (in no particular |
990 | order): Larry Wall, Robert Sanders, Dean Roehrich, Jeff Okamoto, Anno | |
c2960299 | 991 | Siegel, Thomas Neumann, Paul Marquess, Charles Bailey, myself and others. |
3b35bae3 AD |
992 | |
993 | Larry Wall designed the elegant inherited bootstrap mechanism and | |
994 | implemented the first Perl 5 dynamic loader using it. | |
995 | ||
ff7f3c60 NIS |
996 | Solaris global loading added by Nick Ing-Simmons with design/coding |
997 | assistance from Tim Bunce, January 1996. | |
998 | ||
3b35bae3 | 999 | =cut |
03c9e98c GS |
1000 | EOT |
1001 | ||
1002 | close OUT or die $!; | |
1003 |