diff options
Diffstat (limited to 'ext')
| -rw-r--r-- | ext/DynaLoader/DynaLoader_pm.PL | 42 | ||||
| -rw-r--r-- | ext/DynaLoader/Makefile.PL | 1 | ||||
| -rw-r--r-- | ext/DynaLoader/dl_dlopen.xs | 38 | ||||
| -rw-r--r-- | ext/DynaLoader/dlutils.c | 29 |
4 files changed, 102 insertions, 8 deletions
diff --git a/ext/DynaLoader/DynaLoader_pm.PL b/ext/DynaLoader/DynaLoader_pm.PL index 8341b36130..6a3d4a3391 100644 --- a/ext/DynaLoader/DynaLoader_pm.PL +++ b/ext/DynaLoader/DynaLoader_pm.PL @@ -28,7 +28,7 @@ package DynaLoader; # # Tim.Bunce@ig.co.uk, August 1994 -$VERSION = "1.03"; # avoid typo warning +$VERSION = "1.04"; # avoid typo warning require AutoLoader; *AUTOLOAD = \&AutoLoader::AUTOLOAD; @@ -411,7 +411,7 @@ sub dl_find_symbol_anywhere DynaLoader - Dynamically load C libraries into Perl code -dl_error(), dl_findfile(), dl_expandspec(), dl_load_file(), dl_find_symbol(), dl_find_symbol_anywhere(), dl_undef_symbols(), dl_install_xsub(), dl_load_flags(), bootstrap() - routines used by DynaLoader modules +dl_error(), dl_findfile(), dl_expandspec(), dl_load_file(), dl_unload_file(), dl_find_symbol(), dl_find_symbol_anywhere(), dl_undef_symbols(), dl_install_xsub(), dl_load_flags(), bootstrap() - routines used by DynaLoader modules =head1 SYNOPSIS @@ -463,6 +463,7 @@ DynaLoader Interface Summary $symref = dl_find_symbol_anywhere($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 @@ -640,6 +641,43 @@ current values of @dl_require_symbols and @dl_resolve_using if required. 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 $libref, which must be an opaque 'library reference' as +returned from dl_load_file. Returns one on success and zero on failure. + +This function is optional and may not necessarily be provided on all platforms. +If it is defined, it is called automatically when the interpreter exits for +every shared object or library loaded by DynaLoader::bootstrap. All such +library references are stored in @dl_librefs by DynaLoader::Bootstrap as it +loads the libraries. The files are unloaded in the reverse order in to they +were initially loaded. + +This unloading is usually necessary when embedding a shared-object perl (e.g. +one configured with -Duseshrplib) within a larger application, and the perl +interpreter is created and destroyed several times within the lifetime of the +application. In this case it is possible that the system dynamic linker will +unload and then subsequently reload the shared libperl without relocating any +references to it from any files DynaLoaded by the previous incarnation of the +interpreter. As a result, any shared objects opened by DynaLoader may point to +a now invalid 'ghost' of the libperl shared object, causing apparently random +memory corruption and crashes. This behaviour is most commonly seen when using +Apache and mod_perl built with the APXS mechanism. + + SunOS: dlclose($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_loadflags() Syntax: diff --git a/ext/DynaLoader/Makefile.PL b/ext/DynaLoader/Makefile.PL index bcd45ae757..83cbd770b0 100644 --- a/ext/DynaLoader/Makefile.PL +++ b/ext/DynaLoader/Makefile.PL @@ -12,6 +12,7 @@ WriteMakefile( 'XSLoader_pm.PL'=>'XSLoader.pm'}, PM => {'DynaLoader.pm' => '$(INST_LIBDIR)/DynaLoader.pm', 'XSLoader.pm' => '$(INST_LIBDIR)/XSLoader.pm'}, + depend => {'DynaLoader.o' => 'dlutils.c'}, clean => {FILES => 'DynaLoader.c DynaLoader.xs DynaLoader.pm ' . 'XSLoader.pm'}, ); diff --git a/ext/DynaLoader/dl_dlopen.xs b/ext/DynaLoader/dl_dlopen.xs index 135f5112f2..8020e23d97 100644 --- a/ext/DynaLoader/dl_dlopen.xs +++ b/ext/DynaLoader/dl_dlopen.xs @@ -5,11 +5,13 @@ * Created: 10th July 1994 * * Modified: - * 15th July 1994 - Added code to explicitly save any error messages. - * 3rd August 1994 - Upgraded to v3 spec. - * 9th August 1994 - Changed to use IV - * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging, - * basic FreeBSD support, removed ClearError + * 15th July 1994 - Added code to explicitly save any error messages. + * 3rd August 1994 - Upgraded to v3 spec. + * 9th August 1994 - Changed to use IV + * 10th August 1994 - Tim Bunce: Added RTLD_LAZY, switchable debugging, + * basic FreeBSD support, removed ClearError + * 29th Feburary 2000 - Alan Burlison: Added functionality to close dlopen'd + * files when the interpreter exits * */ @@ -37,6 +39,17 @@ RTLD_LAZY (==2) on Solaris 2. + dlclose + ------- + int + dlclose(handle) + void * handle; + + This function takes the handle returned by a previous invocation of + dlopen and closes the associated dynamic object file. It returns zero + on success, and non-zero on failure. + + dlsym ------ void * @@ -57,7 +70,7 @@ Returns a null-terminated string which describes the last error that occurred with either dlopen or dlsym. After each call to dlerror the error message will be reset to a null pointer. The - SaveError function is used to save the error as soo as it happens. + SaveError function is used to save the error as soon as it happens. Return Types @@ -180,6 +193,19 @@ dl_load_file(filename, flags=0) sv_setiv( ST(0), PTR2IV(RETVAL)); } + +int +dl_unload_file(libref) + void * libref + CODE: + DLDEBUG(1,PerlIO_printf(Perl_debug_log, "dl_unload_file(%lx):\n", libref)); + if ((RETVAL = dlclose(libref) == 0 ? 1 : 0) == 0); + SaveError("%s", dlerror()) ; + DLDEBUG(2,PerlIO_printf(Perl_debug_log, " retval = %d\n", RETVAL)); + OUTPUT: + RETVAL + + void * dl_find_symbol(libhandle, symbolname) void * libhandle diff --git a/ext/DynaLoader/dlutils.c b/ext/DynaLoader/dlutils.c index 664e331e7b..fc4cd75e4e 100644 --- a/ext/DynaLoader/dlutils.c +++ b/ext/DynaLoader/dlutils.c @@ -3,6 +3,9 @@ * Currently this file is simply #included into dl_*.xs/.c files. * It should really be split into a dlutils.h and dlutils.c * + * Modified: + * 29th Feburary 2000 - Alan Burlison: Added functionality to close dlopen'd + * files when the interpreter exits */ @@ -25,6 +28,31 @@ static int dl_debug = 0; /* value copied from $DynaLoader::dl_error */ #endif +/* Close all dlopen'd files */ +static void +dl_unload_all_files(pTHXo_ void *unused) +{ + CV *sub; + AV *dl_librefs; + SV *dl_libref; + + if ((sub = get_cv("DynaLoader::dl_unload_file", FALSE)) != NULL) { + dl_librefs = get_av("DynaLoader::dl_librefs", FALSE); + while ((dl_libref = av_pop(dl_librefs)) != &PL_sv_undef) { + dSP; + ENTER; + SAVETMPS; + PUSHMARK(SP); + XPUSHs(sv_2mortal(dl_libref)); + PUTBACK; + call_sv(sub, G_DISCARD); + FREETMPS; + LEAVE; + } + } +} + + static void dl_generic_private_init(pTHXo) /* called by dl_*.xs dl_private_init() */ { @@ -41,6 +69,7 @@ dl_generic_private_init(pTHXo) /* called by dl_*.xs dl_private_init() */ if (!dl_loaded_files) dl_loaded_files = newHV(); /* provide cache for dl_*.xs if needed */ #endif + call_atexit(&dl_unload_all_files, (void*)0); } |