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Diffstat (limited to 'Master/tlpkg/tlperl/lib/DynaLoader.pm')
| -rw-r--r-- | Master/tlpkg/tlperl/lib/DynaLoader.pm | 833 |
1 files changed, 0 insertions, 833 deletions
diff --git a/Master/tlpkg/tlperl/lib/DynaLoader.pm b/Master/tlpkg/tlperl/lib/DynaLoader.pm deleted file mode 100644 index 178e9b2616c..00000000000 --- a/Master/tlpkg/tlperl/lib/DynaLoader.pm +++ /dev/null @@ -1,833 +0,0 @@ - -# Generated from DynaLoader.pm.PL - -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 - -use vars qw($VERSION *AUTOLOAD); - -$VERSION = '1.05'; # avoid typo warning - -require AutoLoader; -*AUTOLOAD = \&AutoLoader::AUTOLOAD; - -use Config; - -# The following require can't be removed during maintenance -# releases, sadly, because of the risk of buggy code that does -# require Carp; Carp::croak "..."; without brackets dying -# if Carp hasn't been loaded in earlier compile time. :-( -# We'll let those bugs get found on the development track. -require Carp if $] < 5.00450; - -# enable debug/trace messages from DynaLoader perl code -$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) -# -# 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, $dlsrc) -# = @Config::Config{'dlext', 'dlsrc'}; - ($dl_dlext, $dlsrc) = ('dll','dl_win32.xs') -; -# Some systems need special handling to expand file specifications -# (VMS support by Charles Bailey <bailey@HMIVAX.HUMGEN.UPENN.EDU>) -# See dl_expandspec() for more details. Should be harmless but -# inefficient to define on systems that don't need it. -$Is_VMS = $^O eq 'VMS'; -$do_expand = $Is_VMS; -$Is_MacOS = $^O eq 'MacOS'; - -my $Mac_FS; -$Mac_FS = eval { require Mac::FileSpec::Unixish } if $Is_MacOS; - -@dl_require_symbols = (); # names of symbols we need -@dl_resolve_using = (); # names of files to link with -@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 - -# This is a fix to support DLD's unfortunate desire to relink -lc -@dl_resolve_using = dl_findfile('-lc') if $dlsrc eq "dl_dld.xs"; - -# 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(@_); -} - -# The bootstrap function cannot be autoloaded (without complications) -# so we define it here: - -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]; - - # 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. - $modfname = &mod2fname(\@modparts) if defined &mod2fname; - - # Truncate the module name to 8.3 format for NetWare - if (($^O eq 'NetWare') && (length($modfname) > 8)) { - $modfname = substr($modfname, 0, 8); - } - - my $modpname = join(($Is_MacOS ? ':' : '/'),@modparts); - - print STDERR "DynaLoader::bootstrap for $module ", - ($Is_MacOS - ? "(:auto:$modpname:$modfname.$dl_dlext)\n" : - "(auto/$modpname/$modfname.$dl_dlext)\n") - if $dl_debug; - - foreach (@INC) { - chop($_ = VMS::Filespec::unixpath($_)) if $Is_VMS; - my $dir; - if ($Is_MacOS) { - my $path = $_; - if ($Mac_FS && ! -d $path) { - $path = Mac::FileSpec::Unixish::nativize($path); - } - $path .= ":" unless /:$/; - $dir = "${path}auto:$modpname"; - } else { - $dir = "$_/auto/$modpname"; - } - - next unless -d $dir; # skip over uninteresting directories - - # check for common cases to avoid autoload of dl_findfile - my $try = $Is_MacOS ? "$dir:$modfname.$dl_dlext" : "$dir/$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' - - $file = uc($file) if $Is_VMS && $Config::Config{d_vms_case_sensitive_symbols}; - 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. - my $bs = $file; - $bs =~ s/(\.\w+)?(;\d*)?$/\.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 { do $bs; }; - warn "$bs: $@\n" if $@; - } - - my $boot_symbol_ref; - - if ($^O eq 'darwin') { - if ($boot_symbol_ref = dl_find_symbol(0, $bootname)) { - goto boot; #extension library has already been loaded, e.g. darwin - } - } - - # 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, $module->dl_load_flags) or - croak("Can't load '$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"); - } - - $boot_symbol_ref = dl_find_symbol($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 _check_file { # private utility to handle dl_expandspec vs -f tests -# my($file) = @_; -# return $file if (!$do_expand && -f $file); # the common case -# return $file if ( $do_expand && ($file=dl_expandspec($file))); -# return undef; -#} - - -# Let autosplit and the autoloader deal with these functions: -__END__ - - -sub dl_findfile { - # Read ext/DynaLoader/DynaLoader.doc for detailed information. - # 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= 'dll'; # $Config::Config{'dlext'} suffix for perl extensions - my $dl_so = 'dll'; # $Config::Config{'so'} suffix for shared libraries - - print STDERR "dl_findfile(@args)\n" if $dl_debug; - - # accumulate directories but process files as they appear - arg: foreach(@args) { - # Special fast case: full filepath requires no search - if ($Is_VMS && m%[:>/\]]% && -f $_) { - push(@found,dl_expandspec(VMS::Filespec::vmsify($_))); - last arg unless wantarray; - next; - } - elsif ($Is_MacOS) { - if (m/:/ && -f $_) { - push(@found,$_); - last arg unless wantarray; - } - } - elsif (m:/: && -f $_ && !$do_expand) { - push(@found,$_); - last arg unless wantarray; - next; - } - - # Deal with directories first: - # Using a -L prefix is the preferred option (faster and more robust) - if (m:^-L:) { s/^-L//; push(@dirs, $_); next; } - - if ($Is_MacOS) { - # 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 - s/^-l//; - push(@names, $_); - foreach $dir (@dirs, @dl_library_path) { - next unless -d $dir; - $dir =~ s/^([^:]+)$/:$1/; - $dir =~ s/:$//; - foreach $name (@names) { - my($file) = "$dir:$name"; - print STDERR " checking in $dir for $name\n" if $dl_debug; - if (-f $file) { - push(@found, $file); - next arg; # no need to look any further - } - } - } - 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, $_); next; } - - # VMS: we may be using native VMS directory syntax instead of - # Unix emulation, so check this as well - if ($Is_VMS && /[:>\]]/ && -d $_) { push(@dirs, $_); next; } - - # Only files should get this far... - my(@names, $name); # what filenames to look for - if (m:-l: ) { # convert -lname to appropriate library name - s/-l//; - push(@names,"lib$_.$dl_so"); - push(@names,"lib$_.a"); - } else { # Umm, a bare name. Try various alternatives: - # these should be ordered with the most likely first - push(@names,"$_.$dl_ext") unless m/\.$dl_ext$/o; - push(@names,"$_.$dl_so") unless m/\.$dl_so$/o; - push(@names,"lib$_.$dl_so") unless m:/:; - push(@names,"$_.a") if !m/\.a$/ and $dlsrc eq "dl_dld.xs"; - push(@names, $_); - } - foreach $dir (@dirs, @dl_library_path) { - next unless -d $dir; - chop($dir = VMS::Filespec::unixpath($dir)) if $Is_VMS; - foreach $name (@names) { - my($file) = "$dir/$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 autoload version will not be called but is harmless. - - # 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 = $spec; # default output to input - - if ($Is_VMS) { # dl_expandspec should be defined in dl_vms.xs - require Carp; - Carp::croak("dl_expandspec: should be defined in XS file!\n"); - } else { - 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); - return $symref if $symref; - } - return undef; -} - -=head1 NAME - -DynaLoader - Dynamically load C libraries into Perl code - -=head1 SYNOPSIS - - package YourPackage; - require DynaLoader; - @ISA = qw(... DynaLoader ...); - bootstrap YourPackage; - - # optional method for 'global' loading - sub dl_load_flags { 0x01 } - - -=head1 DESCRIPTION - -This document defines a standard generic interface to the dynamic -linking mechanisms available on many platforms. Its primary purpose is -to implement automatic dynamic loading of Perl modules. - -This document serves as both a specification for anyone wishing to -implement the DynaLoader for a new platform and as a guide for -anyone wishing to use the DynaLoader directly in an application. - -The DynaLoader is designed to be a very simple high-level -interface that is sufficiently general to cover the requirements -of SunOS, HP-UX, NeXT, Linux, VMS and other platforms. - -It is also hoped that the interface will cover the needs of OS/2, NT -etc and also allow pseudo-dynamic linking (using C<ld -A> at runtime). - -It must be stressed that the DynaLoader, by itself, is practically -useless for accessing non-Perl libraries because it provides almost no -Perl-to-C 'glue'. There is, for example, no mechanism for calling a C -library function or supplying arguments. A C::DynaLib module -is available from CPAN sites which performs that function for some -common system types. And since the year 2000, there's also Inline::C, -a module that allows you to write Perl subroutines in C. Also available -from your local CPAN site. - -DynaLoader Interface Summary - - @dl_library_path - @dl_resolve_using - @dl_require_symbols - $dl_debug - @dl_librefs - @dl_modules - @dl_shared_objects - Implemented in: - bootstrap($modulename) Perl - @filepaths = dl_findfile(@names) Perl - $flags = $modulename->dl_load_flags Perl - $symref = dl_find_symbol_anywhere($symbol) Perl - - $libref = dl_load_file($filename, $flags) C - $status = dl_unload_file($libref) C - $symref = dl_find_symbol($libref, $symbol) C - @symbols = dl_undef_symbols() C - dl_install_xsub($name, $symref [, $filename]) C - $message = dl_error C - -=over 4 - -=item @dl_library_path - -The standard/default list of directories in which dl_findfile() will -search for libraries etc. Directories are searched in order: -$dl_library_path[0], [1], ... etc - -@dl_library_path is initialised to hold the list of 'normal' directories -(F</usr/lib>, etc) determined by B<Configure> (C<$Config{'libpth'}>). This should -ensure portability across a wide range of platforms. - -@dl_library_path should also be initialised with any other directories -that can be determined from the environment at runtime (such as -LD_LIBRARY_PATH for SunOS). - -After initialisation @dl_library_path can be manipulated by an -application using push and unshift before calling dl_findfile(). -Unshift can be used to add directories to the front of the search order -either to save search time or to override libraries with the same name -in the 'normal' directories. - -The load function that dl_load_file() calls may require an absolute -pathname. The dl_findfile() function and @dl_library_path can be -used to search for and return the absolute pathname for the -library/object that you wish to load. - -=item @dl_resolve_using - -A list of additional libraries or other shared objects which can be -used to resolve any undefined symbols that might be generated by a -later call to load_file(). - -This is only required on some platforms which do not handle dependent -libraries automatically. For example the Socket Perl extension -library (F<auto/Socket/Socket.so>) contains references to many socket -functions which need to be resolved when it's loaded. Most platforms -will automatically know where to find the 'dependent' library (e.g., -F</usr/lib/libsocket.so>). A few platforms need to be told the -location of the dependent library explicitly. Use @dl_resolve_using -for this. - -Example usage: - - @dl_resolve_using = dl_findfile('-lsocket'); - -=item @dl_require_symbols - -A list of one or more symbol names that are in the library/object file -to be dynamically loaded. This is only required on some platforms. - -=item @dl_librefs - -An array of the handles returned by successful calls to dl_load_file(), -made by bootstrap, in the order in which they were loaded. -Can be used with dl_find_symbol() to look for a symbol in any of -the loaded files. - -=item @dl_modules - -An array of module (package) names that have been bootstrap'ed. - -=item @dl_shared_objects - -An array of file names for the shared objects that were loaded. - -=item dl_error() - -Syntax: - - $message = dl_error(); - -Error message text from the last failed DynaLoader function. Note -that, similar to errno in unix, a successful function call does not -reset this message. - -Implementations should detect the error as soon as it occurs in any of -the other functions and save the corresponding message for later -retrieval. This will avoid problems on some platforms (such as SunOS) -where the error message is very temporary (e.g., dlerror()). - -=item $dl_debug - -Internal debugging messages are enabled when $dl_debug is set true. -Currently setting $dl_debug only affects the Perl side of the -DynaLoader. These messages should help an application developer to -resolve any DynaLoader usage problems. - -$dl_debug is set to C<$ENV{'PERL_DL_DEBUG'}> if defined. - -For the DynaLoader developer/porter there is a similar debugging -variable added to the C code (see dlutils.c) and enabled if Perl was -built with the B<-DDEBUGGING> flag. This can also be set via the -PERL_DL_DEBUG environment variable. Set to 1 for minimal information or -higher for more. - -=item dl_findfile() - -Syntax: - - @filepaths = dl_findfile(@names) - -Determine the full paths (including file suffix) of one or more -loadable files given their generic names and optionally one or more -directories. Searches directories in @dl_library_path by default and -returns an empty list if no files were found. - -Names can be specified in a variety of platform independent forms. Any -names in the form B<-lname> are converted into F<libname.*>, where F<.*> is -an appropriate suffix for the platform. - -If a name does not already have a suitable prefix and/or suffix then -the corresponding file will be searched for by trying combinations of -prefix and suffix appropriate to the platform: "$name.o", "lib$name.*" -and "$name". - -If any directories are included in @names they are searched before -@dl_library_path. Directories may be specified as B<-Ldir>. Any other -names are treated as filenames to be searched for. - -Using arguments of the form C<-Ldir> and C<-lname> is recommended. - -Example: - - @dl_resolve_using = dl_findfile(qw(-L/usr/5lib -lposix)); - - -=item dl_expandspec() - -Syntax: - - $filepath = dl_expandspec($spec) - -Some unusual systems, such as VMS, require special filename handling in -order to deal with symbolic names for files (i.e., VMS's Logical Names). - -To support these systems a dl_expandspec() function can be implemented -either in the F<dl_*.xs> file or code can be added to the autoloadable -dl_expandspec() function in F<DynaLoader.pm>. See F<DynaLoader.pm> for -more information. - -=item dl_load_file() - -Syntax: - - $libref = dl_load_file($filename, $flags) - -Dynamically load $filename, which must be the path to a shared object -or library. An opaque 'library reference' is returned as a handle for -the loaded object. Returns undef on error. - -The $flags argument to alters 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; this is a normal part of image linking) - -(On systems that provide a handle for the loaded object such as SunOS -and HPUX, $libref will be that handle. On other systems $libref will -typically be $filename or a pointer to a buffer containing $filename. -The application should not examine or alter $libref in any way.) - -This is the function that does the real work. It should use the -current values of @dl_require_symbols and @dl_resolve_using if required. - - SunOS: dlopen($filename) - HP-UX: shl_load($filename) - Linux: dld_create_reference(@dl_require_symbols); dld_link($filename) - NeXT: rld_load($filename, @dl_resolve_using) - VMS: lib$find_image_symbol($filename,$dl_require_symbols[0]) - -(The dlopen() function is also used by Solaris and some versions of -Linux, and is a common choice when providing a "wrapper" on other -mechanisms as is done in the OS/2 port.) - -=item dl_unload_file() - -Syntax: - - $status = dl_unload_file($libref) - -Dynamically unload $libref, which must be an opaque 'library reference' as -returned from dl_load_file. Returns one on success and zero on failure. - -This function is optional and may not necessarily be provided on all platforms. -If it is defined, it is called automatically when the interpreter exits for -every shared object or library loaded by DynaLoader::bootstrap. All such -library references are stored in @dl_librefs by DynaLoader::Bootstrap as it -loads the libraries. The files are unloaded in last-in, first-out order. - -This unloading is usually necessary when embedding a shared-object perl (e.g. -one configured with -Duseshrplib) within a larger application, and the perl -interpreter is created and destroyed several times within the lifetime of the -application. In this case it is possible that the system dynamic linker will -unload and then subsequently reload the shared libperl without relocating any -references to it from any files DynaLoaded by the previous incarnation of the -interpreter. As a result, any shared objects opened by DynaLoader may point to -a now invalid 'ghost' of the libperl shared object, causing apparently random -memory corruption and crashes. This behaviour is most commonly seen when using -Apache and mod_perl built with the APXS mechanism. - - SunOS: dlclose($libref) - HP-UX: ??? - Linux: ??? - NeXT: ??? - VMS: ??? - -(The dlclose() function is also used by Solaris and some versions of -Linux, and is a common choice when providing a "wrapper" on other -mechanisms as is done in the OS/2 port.) - -=item dl_load_flags() - -Syntax: - - $flags = dl_load_flags $modulename; - -Designed to be a method call, and to be overridden by a derived class -(i.e. a class which has DynaLoader in its @ISA). The definition in -DynaLoader itself returns 0, which produces standard behavior from -dl_load_file(). - -=item dl_find_symbol() - -Syntax: - - $symref = dl_find_symbol($libref, $symbol) - -Return the address of the symbol $symbol or C<undef> if not found. If the -target system has separate functions to search for symbols of different -types then dl_find_symbol() should search for function symbols first and -then other types. - -The exact manner in which the address is returned in $symref is not -currently defined. The only initial requirement is that $symref can -be passed to, and understood by, dl_install_xsub(). - - SunOS: dlsym($libref, $symbol) - HP-UX: shl_findsym($libref, $symbol) - Linux: dld_get_func($symbol) and/or dld_get_symbol($symbol) - NeXT: rld_lookup("_$symbol") - VMS: lib$find_image_symbol($libref,$symbol) - - -=item dl_find_symbol_anywhere() - -Syntax: - - $symref = dl_find_symbol_anywhere($symbol) - -Applies dl_find_symbol() to the members of @dl_librefs and returns -the first match found. - -=item dl_undef_symbols() - -Example - - @symbols = dl_undef_symbols() - -Return a list of symbol names which remain undefined after load_file(). -Returns C<()> if not known. Don't worry if your platform does not provide -a mechanism for this. Most do not need it and hence do not provide it, -they just return an empty list. - - -=item dl_install_xsub() - -Syntax: - - dl_install_xsub($perl_name, $symref [, $filename]) - -Create a new Perl external subroutine named $perl_name using $symref as -a pointer to the function which implements the routine. This is simply -a direct call to newXSUB(). Returns a reference to the installed -function. - -The $filename parameter is used by Perl to identify the source file for -the function if required by die(), caller() or the debugger. If -$filename is not defined then "DynaLoader" will be used. - - -=item bootstrap() - -Syntax: - -bootstrap($module) - -This is the normal entry point for automatic dynamic loading in Perl. - -It performs the following actions: - -=over 8 - -=item * - -locates an auto/$module directory by searching @INC - -=item * - -uses dl_findfile() to determine the filename to load - -=item * - -sets @dl_require_symbols to C<("boot_$module")> - -=item * - -executes an F<auto/$module/$module.bs> file if it exists -(typically used to add to @dl_resolve_using any files which -are required to load the module on the current platform) - -=item * - -calls dl_load_flags() to determine how to load the file. - -=item * - -calls dl_load_file() to load the file - -=item * - -calls dl_undef_symbols() and warns if any symbols are undefined - -=item * - -calls dl_find_symbol() for "boot_$module" - -=item * - -calls dl_install_xsub() to install it as "${module}::bootstrap" - -=item * - -calls &{"${module}::bootstrap"} to bootstrap the module (actually -it uses the function reference returned by dl_install_xsub for speed) - -=back - -=back - - -=head1 AUTHOR - -Tim Bunce, 11 August 1994. - -This interface is based on the work and comments of (in no particular -order): Larry Wall, Robert Sanders, Dean Roehrich, Jeff Okamoto, Anno -Siegel, Thomas Neumann, Paul Marquess, Charles Bailey, myself and others. - -Larry Wall designed the elegant inherited bootstrap mechanism and -implemented the first Perl 5 dynamic loader using it. - -Solaris global loading added by Nick Ing-Simmons with design/coding -assistance from Tim Bunce, January 1996. - -=cut |