1 /* GMODULE - GLIB wrapper code for dynamic module loading
2 * Copyright (C) 1998, 2000 Tim Janik
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser 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 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser 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 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GLib Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GLib at ftp://ftp.gtk.org/pub/gtk/.
33 /* Perl includes <nlist.h> and <link.h> instead of <dlfcn.h> on some systmes? */
36 /* dlerror() is not implemented on all systems
38 #ifndef G_MODULE_HAVE_DLERROR
40 # define dlerror() g_strerror (errno)
41 # else /* !__NetBSD__ */
42 /* could we rely on errno's state here? */
43 # define dlerror() "unknown dl-error"
44 # endif /* !__NetBSD__ */
45 #endif /* G_MODULE_HAVE_DLERROR */
47 /* some flags are missing on some systems, so we provide
49 * The Perl sources say, RTLD_LAZY needs to be defined as (1),
50 * at least for Solaris 1.
53 * RTLD_LAZY - resolve undefined symbols as code from the dynamic library
55 * RTLD_NOW - resolve all undefined symbols before dlopen returns, and fail
56 * if this cannot be done.
58 * RTLD_GLOBAL - the external symbols defined in the library will be made
59 * available to subsequently loaded libraries.
63 #endif /* RTLD_GLOBAL */
66 #endif /* RTLD_LAZY */
72 /* --- functions --- */
74 fetch_dlerror (gboolean replace_null)
76 gchar *msg = dlerror ();
78 /* make sure we always return an error message != NULL, if
79 * expected to do so. */
81 if (!msg && replace_null)
82 return "unknown dl-error";
88 _g_module_open (const gchar *file_name,
93 handle = dlopen (file_name, RTLD_GLOBAL | (bind_lazy ? RTLD_LAZY : RTLD_NOW));
95 g_module_set_error (fetch_dlerror (TRUE));
101 _g_module_self (void)
105 /* to query symbols from the program itself, special link options
106 * are required on some systems.
109 handle = dlopen (NULL, RTLD_GLOBAL | RTLD_LAZY);
111 g_module_set_error (fetch_dlerror (TRUE));
117 _g_module_close (gpointer handle,
120 /* are there any systems out there that have dlopen()/dlclose()
121 * without a reference count implementation?
127 if (dlclose (handle) != 0)
128 g_module_set_error (fetch_dlerror (TRUE));
133 _g_module_symbol (gpointer handle,
134 const gchar *symbol_name)
138 p = dlsym (handle, symbol_name);
140 g_module_set_error (fetch_dlerror (FALSE));
146 _g_module_build_path (const gchar *directory,
147 const gchar *module_name)
149 if (directory && *directory) {
150 if (strncmp (module_name, "lib", 3) == 0)
151 return g_strconcat (directory, "/", module_name, NULL);
153 return g_strconcat (directory, "/lib", module_name, ".so", NULL);
154 } else if (strncmp (module_name, "lib", 3) == 0)
155 return g_strdup (module_name);
157 return g_strconcat ("lib", module_name, ".so", NULL);