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.
26 /* Perl includes <nlist.h> and <link.h> instead of <dlfcn.h> on some systmes? */
29 /* dlerror() is not implemented on all systems
31 #ifndef G_MODULE_HAVE_DLERROR
33 # define dlerror() g_strerror (errno)
34 # else /* !__NetBSD__ */
35 /* could we rely on errno's state here? */
36 # define dlerror() "unknown dl-error"
37 # endif /* !__NetBSD__ */
38 #endif /* G_MODULE_HAVE_DLERROR */
40 /* some flags are missing on some systems, so we provide
42 * The Perl sources say, RTLD_LAZY needs to be defined as (1),
43 * at least for Solaris 1.
46 * RTLD_LAZY - resolve undefined symbols as code from the dynamic library
48 * RTLD_NOW - resolve all undefined symbols before dlopen returns, and fail
49 * if this cannot be done.
51 * RTLD_GLOBAL - the external symbols defined in the library will be made
52 * available to subsequently loaded libraries.
56 #endif /* RTLD_GLOBAL */
59 #endif /* RTLD_LAZY */
65 /* --- functions --- */
67 _g_module_open (const gchar *file_name,
72 handle = dlopen (file_name, RTLD_GLOBAL | (bind_lazy ? RTLD_LAZY : RTLD_NOW));
74 g_module_set_error (dlerror ());
84 /* to query symbols from the program itself, special link options
85 * are required on some systems.
88 handle = dlopen (NULL, RTLD_GLOBAL | RTLD_LAZY);
90 g_module_set_error (dlerror ());
96 _g_module_close (gpointer handle,
99 /* are there any systems out there that have dlopen()/dlclose()
100 * without a reference count implementation?
106 if (dlclose (handle) != 0)
107 g_module_set_error (dlerror ());
112 _g_module_symbol (gpointer handle,
113 const gchar *symbol_name)
117 p = dlsym (handle, symbol_name);
119 g_module_set_error (dlerror ());
125 _g_module_build_path (const gchar *directory,
126 const gchar *module_name)
128 if (directory && *directory) {
129 if (strncmp (module_name, "lib", 3) == 0)
130 return g_strconcat (directory, "/", module_name, NULL);
132 return g_strconcat (directory, "/lib", module_name, ".so", NULL);
133 } else if (strncmp (module_name, "lib", 3) == 0)
134 return g_strdup (module_name);
136 return g_strconcat ("lib", module_name, ".so", NULL);