/* GMODULE - GLIB wrapper code for dynamic module loading
- * Copyright (C) 1998 Tim Janik
+ * Copyright (C) 1998, 2000 Tim Janik
*
* This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
+ * modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
+
+/*
+ * Modified by the GLib Team and others 1997-2000. See the AUTHORS
+ * file for a list of people on the GLib Team. See the ChangeLog
+ * files for a list of changes. These files are distributed with
+ * GLib at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+/*
+ * MT safe
+ */
+#include "config.h"
+
#include <dlfcn.h>
/* Perl includes <nlist.h> and <link.h> instead of <dlfcn.h> on some systmes? */
* harmless defaults.
* The Perl sources say, RTLD_LAZY needs to be defined as (1),
* at least for Solaris 1.
+ *
+ * Mandatory:
+ * RTLD_LAZY - resolve undefined symbols as code from the dynamic library
+ * is executed.
+ * RTLD_NOW - resolve all undefined symbols before dlopen returns, and fail
+ * if this cannot be done.
+ * Optionally:
+ * RTLD_GLOBAL - the external symbols defined in the library will be made
+ * available to subsequently loaded libraries.
*/
-#ifndef RTLD_GLOBAL
-#define RTLD_GLOBAL 0
-#endif /* RTLD_GLOBAL */
#ifndef RTLD_LAZY
#define RTLD_LAZY 1
#endif /* RTLD_LAZY */
#ifndef RTLD_NOW
#define RTLD_NOW 0
#endif /* RTLD_NOW */
+/* some systems (OSF1 V5.0) have broken RTLD_GLOBAL linkage */
+#ifdef G_MODULE_BROKEN_RTLD_GLOBAL
+#undef RTLD_GLOBAL
+#endif /* G_MODULE_BROKEN_RTLD_GLOBAL */
+#ifndef RTLD_GLOBAL
+#define RTLD_GLOBAL 0
+#endif /* RTLD_GLOBAL */
/* --- functions --- */
+static gchar*
+fetch_dlerror (gboolean replace_null)
+{
+ gchar *msg = dlerror ();
+
+ /* make sure we always return an error message != NULL, if
+ * expected to do so. */
+
+ if (!msg && replace_null)
+ return "unknown dl-error";
+
+ return msg;
+}
+
static gpointer
-_g_module_open (const gchar *file_name,
- gboolean bind_lazy)
+_g_module_open (const gchar *file_name,
+ gboolean bind_lazy,
+ gboolean bind_local)
{
gpointer handle;
-
- handle = dlopen (file_name, RTLD_GLOBAL | (bind_lazy ? RTLD_LAZY : RTLD_NOW));
+
+ handle = dlopen (file_name,
+ (bind_local ? 0 : RTLD_GLOBAL) | (bind_lazy ? RTLD_LAZY : RTLD_NOW));
if (!handle)
- g_module_set_error (dlerror ());
-
+ g_module_set_error (fetch_dlerror (TRUE));
+
return handle;
}
_g_module_self (void)
{
gpointer handle;
-
+
/* to query symbols from the program itself, special link options
* are required on some systems.
*/
-
+
+#ifdef __BIONIC__
+ handle = RTLD_DEFAULT;
+#else
handle = dlopen (NULL, RTLD_GLOBAL | RTLD_LAZY);
+#endif
if (!handle)
- g_module_set_error (dlerror ());
-
+ g_module_set_error (fetch_dlerror (TRUE));
+
return handle;
}
static void
-_g_module_close (gpointer *handle_p,
- gboolean is_unref)
+_g_module_close (gpointer handle,
+ gboolean is_unref)
{
/* are there any systems out there that have dlopen()/dlclose()
* without a reference count implementation?
*/
is_unref |= 1;
-
+
if (is_unref)
{
- if (dlclose (*handle_p) != 0)
- g_module_set_error (dlerror ());
+ if (dlclose (handle) != 0)
+ g_module_set_error (fetch_dlerror (TRUE));
}
}
static gpointer
-_g_module_symbol (gpointer *handle_p,
- const gchar *symbol_name)
+_g_module_symbol (gpointer handle,
+ const gchar *symbol_name)
{
gpointer p;
-
- p = dlsym (*handle_p, symbol_name);
- if (!p)
- g_module_set_error (dlerror ());
-
+ gchar *msg;
+
+ fetch_dlerror (FALSE);
+ p = dlsym (handle, symbol_name);
+ msg = fetch_dlerror (FALSE);
+ if (msg)
+ g_module_set_error (msg);
+
return p;
}
+
+static gchar*
+_g_module_build_path (const gchar *directory,
+ const gchar *module_name)
+{
+ if (directory && *directory) {
+ if (strncmp (module_name, "lib", 3) == 0)
+ return g_strconcat (directory, "/", module_name, NULL);
+ else
+ return g_strconcat (directory, "/lib", module_name, "." G_MODULE_SUFFIX, NULL);
+ } else if (strncmp (module_name, "lib", 3) == 0)
+ return g_strdup (module_name);
+ else
+ return g_strconcat ("lib", module_name, "." G_MODULE_SUFFIX, NULL);
+}