1 /* GMODULE - GLIB wrapper code for dynamic module loading
2 * Copyright (C) 1998 Tim Janik
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 /* Perl includes <nlist.h> and <link.h> instead of <dlfcn.h> on some systmes? */
24 /* dlerror() is not implemented on all systems
26 #ifndef G_MODULE_HAVE_DLERROR
28 # define dlerror() g_strerror (errno)
29 # else /* !__NetBSD__ */
30 /* could we rely on errno's state here? */
31 # define dlerror() "unknown dl-error"
32 # endif /* !__NetBSD__ */
33 #endif /* G_MODULE_HAVE_DLERROR */
35 /* some flags are missing on some systems, so we provide
37 * The Perl sources say, RTLD_LAZY needs to be defined as (1),
38 * at least for Solaris 1.
41 * RTLD_LAZY - resolve undefined symbols as code from the dynamic library
43 * RTLD_NOW - resolve all undefined symbols before dlopen returns, and fail
44 * if this cannot be done.
46 * RTLD_GLOBAL - the external symbols defined in the library will be made
47 * available to subsequently loaded libraries.
51 #endif /* RTLD_GLOBAL */
54 #endif /* RTLD_LAZY */
60 /* --- functions --- */
62 _g_module_open (const gchar *file_name,
67 handle = dlopen (file_name, RTLD_GLOBAL | (bind_lazy ? RTLD_LAZY : RTLD_NOW));
69 g_module_set_error (dlerror ());
79 /* to query symbols from the program itself, special link options
80 * are required on some systems.
83 handle = dlopen (NULL, RTLD_GLOBAL | RTLD_LAZY);
85 g_module_set_error (dlerror ());
91 _g_module_close (gpointer handle,
94 /* are there any systems out there that have dlopen()/dlclose()
95 * without a reference count implementation?
101 if (dlclose (handle) != 0)
102 g_module_set_error (dlerror ());
107 _g_module_symbol (gpointer handle,
108 const gchar *symbol_name)
112 p = dlsym (handle, symbol_name);
114 g_module_set_error (dlerror ());
120 _g_module_build_path (const gchar *directory,
121 const gchar *module_name)
124 return g_strconcat (directory, "/lib", module_name, ".so", NULL);
126 return g_strconcat ("lib", module_name, ".so", NULL);