# Generated from XSLoader.pm.PL (resolved %Config::Config value) package XSLoader; # And Gandalf said: 'Many folk like to know beforehand what is to # be set on the table; but those who have laboured to prepare the # feast like to keep their secret; for wonder makes the words of # praise louder.' # (Quote from Tolkien sugested by Anno Siegel.) # # See pod text at end of file for documentation. # See also ext/DynaLoader/README in source tree for other information. # # Tim.Bunce@ig.co.uk, August 1994 $VERSION = "0.01"; # avoid typo warning # enable debug/trace messages from DynaLoader perl code # $dl_debug = $ENV{PERL_DL_DEBUG} || 0 unless defined $dl_debug; my $dl_dlext = 'so'; package DynaLoader; # No prizes for guessing why we don't say 'bootstrap DynaLoader;' here. # NOTE: All dl_*.xs (including dl_none.xs) define a dl_error() XSUB boot_DynaLoader('DynaLoader') if defined(&boot_DynaLoader) && !defined(&dl_error); package XSLoader; 1; # End of main code # The bootstrap function cannot be autoloaded (without complications) # so we define it here: sub load { package DynaLoader; my($module) = $_[0]; # work with static linking too my $b = "$module\::bootstrap"; goto &$b if defined &$b; goto retry unless $module and defined &dl_load_file; my @modparts = split(/::/,$module); my $modfname = $modparts[-1]; my $modpname = join('/',@modparts); my $modlibname = (caller())[1]; my $c = @modparts; $modlibname =~ s,[\\/][^\\/]+$,, while $c--; # Q&D basename my $file = "$modlibname/auto/$modpname/$modfname.$dl_dlext"; # print STDERR "XSLoader::load for $module ($file)\n" if $dl_debug; my $bs = $file; $bs =~ s/(\.\w+)?(;\d*)?$/\.bs/; # look for .bs 'beside' the library goto retry if not -f $file or -s $bs; my $bootname = "boot_$module"; $bootname =~ s/\W/_/g; @dl_require_symbols = ($bootname); # Many dynamic extension loading problems will appear to come from # this section of code: XYZ failed at line 123 of DynaLoader.pm. # Often these errors are actually occurring in the initialisation # C code of the extension XS file. Perl reports the error as being # in this perl code simply because this was the last perl code # it executed. my $libref = dl_load_file($file, 0) or do { require Carp; Carp::croak("Can't load '$file' for module $module: " . dl_error()); }; push(@dl_librefs,$libref); # record loaded object my @unresolved = dl_undef_symbols(); if (@unresolved) { require Carp; Carp::carp("Undefined symbols present after loading $file: @unresolved\n"); } my $boot_symbol_ref = dl_find_symbol($libref, $bootname) or do { require Carp; Carp::croak("Can't find '$bootname' symbol in $file\n"); }; my $xs = dl_install_xsub("${module}::bootstrap", $boot_symbol_ref, $file); push(@dl_modules, $module); # record loaded module # See comment block above return &$xs(@_); retry: require DynaLoader; goto &DynaLoader::bootstrap_inherit; } __END__ =head1 NAME XSLoader - Dynamically load C libraries into Perl code =head1 SYNOPSIS package YourPackage; use XSLoader; XSLoader::load 'YourPackage', @args; =head1 DESCRIPTION This module defines a standard I interface to the dynamic linking mechanisms available on many platforms. Its primary purpose is to implement cheap automatic dynamic loading of Perl modules. For more complicated interface see L. =head1 AUTHOR Ilya Zakharevich: extraction from DynaLoader. =cut