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fac803a223
Mon Aug 10 03:35:57 1998 Tim Janik <timj@gtk.org>
* gmodule.c: minor changes to internal interface.
* gmodule-dl.c:
* gmodule-dld.c: put some comments into the files, and provided
better error checking for shl_findsym(). whish i had a system to
test this stuff on.
118 lines
3.0 KiB
C
118 lines
3.0 KiB
C
/* GMODULE - GLIB wrapper code for dynamic module loading
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* Copyright (C) 1998 Tim Janik
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <dlfcn.h>
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/* Perl includes <nlist.h> and <link.h> instead of <dlfcn.h> on some systmes? */
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/* dlerror() is not implemented on all systems
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*/
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#ifndef G_MODULE_HAVE_DLERROR
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# ifdef __NetBSD__
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# define dlerror() g_strerror (errno)
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# else /* !__NetBSD__ */
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/* could we rely on errno's state here? */
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# define dlerror() "unknown dl-error"
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# endif /* !__NetBSD__ */
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#endif /* G_MODULE_HAVE_DLERROR */
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/* some flags are missing on some systems, so we provide
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* harmless defaults.
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* The Perl sources say, RTLD_LAZY needs to be defined as (1),
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* at least for Solaris 1.
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*
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* Mandatory:
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* RTLD_LAZY - resolve undefined symbols as code from the dynamic library
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* is executed.
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* RTLD_NOW - resolve all undefined symbols before dlopen returns, and fail
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* if this cannot be done.
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* Optionally:
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* RTLD_GLOBAL - the external symbols defined in the library will be made
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* available to subsequently loaded libraries.
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*/
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#ifndef RTLD_GLOBAL
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#define RTLD_GLOBAL 0
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#endif /* RTLD_GLOBAL */
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#ifndef RTLD_LAZY
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#define RTLD_LAZY 1
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#endif /* RTLD_LAZY */
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#ifndef RTLD_NOW
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#define RTLD_NOW 0
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#endif /* RTLD_NOW */
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/* --- functions --- */
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static gpointer
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_g_module_open (const gchar *file_name,
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gboolean bind_lazy)
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{
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gpointer handle;
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handle = dlopen (file_name, RTLD_GLOBAL | (bind_lazy ? RTLD_LAZY : RTLD_NOW));
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if (!handle)
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g_module_set_error (dlerror ());
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return handle;
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}
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static gpointer
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_g_module_self (void)
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{
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gpointer handle;
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/* to query symbols from the program itself, special link options
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* are required on some systems.
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*/
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handle = dlopen (NULL, RTLD_GLOBAL | RTLD_LAZY);
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if (!handle)
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g_module_set_error (dlerror ());
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return handle;
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}
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static void
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_g_module_close (gpointer handle,
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gboolean is_unref)
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{
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/* are there any systems out there that have dlopen()/dlclose()
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* without a reference count implementation?
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*/
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is_unref |= 1;
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if (is_unref)
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{
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if (dlclose (handle) != 0)
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g_module_set_error (dlerror ());
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}
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}
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static gpointer
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_g_module_symbol (gpointer handle,
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const gchar *symbol_name)
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{
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gpointer p;
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p = dlsym (handle, symbol_name);
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if (!p)
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g_module_set_error (dlerror ());
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return p;
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}
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