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- # Generated from DynaLoader_pm.PL, this file is unique for every OS
- package DynaLoader;
- # 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 suggested 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
- BEGIN {
- $VERSION = '1.45';
- }
- use Config;
- # enable debug/trace messages from DynaLoader perl code
- $dl_debug = $ENV{PERL_DL_DEBUG} || 0 unless defined $dl_debug;
- #
- # Flags to alter dl_load_file behaviour. Assigned bits:
- # 0x01 make symbols available for linking later dl_load_file's.
- # (only known to work on Solaris 2 using dlopen(RTLD_GLOBAL))
- # (ignored under VMS; effect is built-in to image linking)
- # (ignored under Android; the linker always uses RTLD_LOCAL)
- #
- # This is called as a class method $module->dl_load_flags. The
- # definition here will be inherited and result on "default" loading
- # behaviour unless a sub-class of DynaLoader defines its own version.
- #
- sub dl_load_flags { 0x00 }
- ($dl_dlext, $dl_so, $dlsrc) = @Config::Config{qw(dlext so dlsrc)};
- $do_expand = 0;
- @dl_require_symbols = (); # names of symbols we need
- @dl_library_path = (); # path to look for files
- #XSLoader.pm may have added elements before we were required
- #@dl_shared_objects = (); # shared objects for symbols we have
- #@dl_librefs = (); # things we have loaded
- #@dl_modules = (); # Modules we have loaded
- # Initialise @dl_library_path with the 'standard' library path
- # for this platform as determined by Configure.
- push(@dl_library_path, split(' ', $Config::Config{libpth}));
- my $ldlibpthname = $Config::Config{ldlibpthname};
- my $ldlibpthname_defined = defined $Config::Config{ldlibpthname};
- my $pthsep = $Config::Config{path_sep};
- # Add to @dl_library_path any extra directories we can gather from environment
- # during runtime.
- if ($ldlibpthname_defined &&
- exists $ENV{$ldlibpthname}) {
- push(@dl_library_path, split(/$pthsep/, $ENV{$ldlibpthname}));
- }
- # E.g. HP-UX supports both its native SHLIB_PATH *and* LD_LIBRARY_PATH.
- if ($ldlibpthname_defined &&
- $ldlibpthname ne 'LD_LIBRARY_PATH' &&
- exists $ENV{LD_LIBRARY_PATH}) {
- push(@dl_library_path, split(/$pthsep/, $ENV{LD_LIBRARY_PATH}));
- }
- # No prizes for guessing why we don't say 'bootstrap DynaLoader;' here.
- # NOTE: All dl_*.xs (including dl_none.xs) define a dl_error() XSUB
- boot_DynaLoader('DynaLoader') if defined(&boot_DynaLoader) &&
- !defined(&dl_error);
- if ($dl_debug) {
- print STDERR "DynaLoader.pm loaded (@INC, @dl_library_path)\n";
- print STDERR "DynaLoader not linked into this perl\n"
- unless defined(&boot_DynaLoader);
- }
- 1; # End of main code
- sub croak { require Carp; Carp::croak(@_) }
- sub bootstrap_inherit {
- my $module = $_[0];
- local *isa = *{"$module\::ISA"};
- local @isa = (@isa, 'DynaLoader');
- # Cannot goto due to delocalization. Will report errors on a wrong line?
- bootstrap(@_);
- }
- sub bootstrap {
- # use local vars to enable $module.bs script to edit values
- local(@args) = @_;
- local($module) = $args[0];
- local(@dirs, $file);
- unless ($module) {
- require Carp;
- Carp::confess("Usage: DynaLoader::bootstrap(module)");
- }
- # A common error on platforms which don't support dynamic loading.
- # Since it's fatal and potentially confusing we give a detailed message.
- croak("Can't load module $module, dynamic loading not available in this perl.\n".
- " (You may need to build a new perl executable which either supports\n".
- " dynamic loading or has the $module module statically linked into it.)\n")
- unless defined(&dl_load_file);
-
- my @modparts = split(/::/,$module);
- my $modfname = $modparts[-1];
- my $modfname_orig = $modfname; # For .bs file search
- # Some systems have restrictions on files names for DLL's etc.
- # mod2fname returns appropriate file base name (typically truncated)
- # It may also edit @modparts if required.
- $modfname = &mod2fname(\@modparts) if defined &mod2fname;
-
- my $modpname = join('/',@modparts);
- print STDERR "DynaLoader::bootstrap for $module ",
- "(auto/$modpname/$modfname.$dl_dlext)\n"
- if $dl_debug;
- my $dir;
- foreach (@INC) {
-
- $dir = "$_/auto/$modpname";
-
- next unless -d $dir; # skip over uninteresting directories
-
- # check for common cases to avoid autoload of dl_findfile
- my $try = "$dir/$modfname.$dl_dlext";
- last if $file = ($do_expand) ? dl_expandspec($try) : ((-f $try) && $try);
-
- # no luck here, save dir for possible later dl_findfile search
- push @dirs, $dir;
- }
- # last resort, let dl_findfile have a go in all known locations
- $file = dl_findfile(map("-L$_",@dirs,@INC), $modfname) unless $file;
- croak("Can't locate loadable object for module $module in \@INC (\@INC contains: @INC)")
- unless $file; # wording similar to error from 'require'
-
- my $bootname = "boot_$module";
- $bootname =~ s/\W/_/g;
- @dl_require_symbols = ($bootname);
- # Execute optional '.bootstrap' perl script for this module.
- # The .bs file can be used to configure @dl_resolve_using etc to
- # match the needs of the individual module on this architecture.
- # N.B. The .bs file does not following the naming convention used
- # by mod2fname.
- my $bs = "$dir/$modfname_orig";
- $bs =~ s/(\.\w+)?(;\d*)?$/\.bs/; # look for .bs 'beside' the library
- if (-s $bs) { # only read file if it's not empty
- print STDERR "BS: $bs ($^O, $dlsrc)\n" if $dl_debug;
- eval { local @INC = ('.'); do $bs; };
- warn "$bs: $@\n" if $@;
- }
- my $boot_symbol_ref;
-
- # 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 $flags = $module->dl_load_flags;
-
- my $libref = dl_load_file($file, $flags) or
- croak("Can't load '$file' for module $module: ".dl_error());
- push(@dl_librefs,$libref); # record loaded object
- $boot_symbol_ref = dl_find_symbol($libref, $bootname) or
- croak("Can't find '$bootname' symbol in $file\n");
- push(@dl_modules, $module); # record loaded module
- boot:
- my $xs = dl_install_xsub("${module}::bootstrap", $boot_symbol_ref, $file);
- # See comment block above
- push(@dl_shared_objects, $file); # record files loaded
- &$xs(@args);
- }
- sub dl_findfile {
- # This function does not automatically consider the architecture
- # or the perl library auto directories.
- my (@args) = @_;
- my (@dirs, $dir); # which directories to search
- my (@found); # full paths to real files we have found
- #my $dl_ext= 'so'; # $Config::Config{'dlext'} suffix for perl extensions
- #my $dl_so = 'so'; # $Config::Config{'so'} suffix for shared libraries
- print STDERR "dl_findfile(@args)\n" if $dl_debug;
- # accumulate directories but process files as they appear
- arg: foreach(@args) {
- # Special fast case: full filepath requires no search
-
-
- if (m:/: && -f $_) {
- push(@found,$_);
- last arg unless wantarray;
- next;
- }
-
- # Deal with directories first:
- # Using a -L prefix is the preferred option (faster and more robust)
- if ( s{^-L}{} ) { push(@dirs, $_); next; }
- # Otherwise we try to try to spot directories by a heuristic
- # (this is a more complicated issue than it first appears)
- if (m:/: && -d $_) { push(@dirs, $_); next; }
-
- # Only files should get this far...
- my(@names, $name); # what filenames to look for
- if ( s{^-l}{} ) { # convert -lname to appropriate library name
- push(@names, "lib$_.$dl_so", "lib$_.a");
- } else { # Umm, a bare name. Try various alternatives:
- # these should be ordered with the most likely first
- push(@names,"$_.$dl_dlext") unless m/\.$dl_dlext$/o;
- push(@names,"$_.$dl_so") unless m/\.$dl_so$/o;
-
- push(@names,"lib$_.$dl_so") unless m:/:;
- push(@names, $_);
- }
- my $dirsep = '/';
-
- foreach $dir (@dirs, @dl_library_path) {
- next unless -d $dir;
-
- foreach $name (@names) {
- my($file) = "$dir$dirsep$name";
- print STDERR " checking in $dir for $name\n" if $dl_debug;
- $file = ($do_expand) ? dl_expandspec($file) : (-f $file && $file);
- #$file = _check_file($file);
- if ($file) {
- push(@found, $file);
- next arg; # no need to look any further
- }
- }
- }
- }
- if ($dl_debug) {
- foreach(@dirs) {
- print STDERR " dl_findfile ignored non-existent directory: $_\n" unless -d $_;
- }
- print STDERR "dl_findfile found: @found\n";
- }
- return $found[0] unless wantarray;
- @found;
- }
- sub dl_expandspec {
- my($spec) = @_;
- # Optional function invoked if DynaLoader.pm sets $do_expand.
- # Most systems do not require or use this function.
- # Some systems may implement it in the dl_*.xs file in which case
- # this Perl version should be excluded at build time.
- # This function is designed to deal with systems which treat some
- # 'filenames' in a special way. For example VMS 'Logical Names'
- # (something like unix environment variables - but different).
- # This function should recognise such names and expand them into
- # full file paths.
- # Must return undef if $spec is invalid or file does not exist.
- my $file = $spec; # default output to input
- return undef unless -f $file;
- print STDERR "dl_expandspec($spec) => $file\n" if $dl_debug;
- $file;
- }
- sub dl_find_symbol_anywhere
- {
- my $sym = shift;
- my $libref;
- foreach $libref (@dl_librefs) {
- my $symref = dl_find_symbol($libref,$sym,1);
- return $symref if $symref;
- }
- return undef;
- }
- __END__
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