/* 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
+ * You should have received a copy of the GNU Lesser 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.
*/
+
+/*
+ * 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 <dl.h>
/* some flags are missing on some systems, so we provide
* harmless defaults.
+ *
+ * Mandatory:
+ * BIND_IMMEDIATE - Resolve symbol references when the library is loaded.
+ * BIND_DEFERRED - Delay code symbol resolution until actual reference.
+ *
+ * Optionally:
+ * BIND_FIRST - Place the library at the head of the symbol search order.
+ * BIND_NONFATAL - The default BIND_IMMEDIATE behavior is to treat all unsatisfied
+ * symbols as fatal. This flag allows binding of unsatisfied code
+ * symbols to be deferred until use.
+ * [Perl: For certain libraries, like DCE, deferred binding often
+ * causes run time problems. Adding BIND_NONFATAL to BIND_IMMEDIATE
+ * still allows unresolved references in situations like this.]
+ * BIND_NOSTART - Do not call the initializer for the shared library when the
+ * library is loaded, nor on a future call to shl_unload().
+ * BIND_VERBOSE - Print verbose messages concerning possible unsatisfied symbols.
+ *
+ * hp9000s700/hp9000s800:
+ * BIND_RESTRICTED - Restrict symbols visible by the library to those present at
+ * library load time.
+ * DYNAMIC_PATH - Allow the loader to dynamically search for the library specified
+ * by the path argument.
*/
#ifndef DYNAMIC_PATH
#define DYNAMIC_PATH 0
#endif /* DYNAMIC_PATH */
+#ifndef BIND_RESTRICTED
+#define BIND_RESTRICTED 0
+#endif /* BIND_RESTRICTED */
-/* should we have BIND_TOGETHER here as well? */
-#define CONST_BIND_FLAGS (BIND_NONFATAL | BIND_VERBOSE)
+#define OPT_BIND_FLAGS (BIND_NONFATAL | BIND_VERBOSE)
/* --- functions --- */
+
+/*
+ * shl_load() does not appear to support making symbols invisible to
+ * the global namespace. However, the default is to put the library
+ * last in the search order, which is approximately what we want,
+ * since it will cause symbols that conflict with existing symbols to
+ * be invisible. It is unclear if BIND_FIRST should be used when
+ * bind_local==0, since it may cause the loaded symbols to be used
+ * preferentially to the application's symbols, which is Almost
+ * Always Wrong. --ds
+ */
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 = shl_load (file_name, CONST_BIND_FLAGS | (bind_lazy ? BIND_DEFERRED : BIND_IMMEDIATE), 0);
- if (!handle)
- g_module_set_error (g_strerror (errno));
-
- return handle;
+ shl_t shl_handle;
+
+ shl_handle = shl_load (file_name,
+ (bind_lazy ? BIND_DEFERRED : BIND_IMMEDIATE) | OPT_BIND_FLAGS, 0);
+ if (!shl_handle)
+ {
+ /* the hp-docs say we should better abort() if errno==ENOSYM ;( */
+ g_module_set_error (g_strerror (errno));
+ }
+
+ return (gpointer) shl_handle;
}
static gpointer
_g_module_self (void)
{
- gpointer handle;
-
- handle = PROG_HANDLE;
- if (!handle)
+ shl_t shl_handle;
+
+ shl_handle = PROG_HANDLE;
+ if (!shl_handle)
g_module_set_error (g_strerror (errno));
-
- return handle;
+
+ return shl_handle;
}
static void
-_g_module_close (gpointer *handle_p,
- gboolean is_unref)
+_g_module_close (gpointer handle,
+ gboolean is_unref)
{
if (!is_unref)
{
- if (shl_unload (*handle_p) != 0)
+ if (shl_unload ((shl_t) handle) != 0)
g_module_set_error (g_strerror (errno));
}
}
static gpointer
-_g_module_symbol (gpointer *handle_p,
- const gchar *symbol_name)
+_g_module_symbol (gpointer handle,
+ const gchar *symbol_name)
{
gpointer p = NULL;
-
+
/* should we restrict lookups to TYPE_PROCEDURE?
*/
- if (shl_findsym (handle_p, symbol_name, TYPE_UNDEFINED, &p) != 0 || p == NULL)
- g_module_set_error (g_strerror (errno));
+ if (handle == PROG_HANDLE)
+ {
+ /* PROG_HANDLE will only lookup symbols in the program itself, not honouring
+ * libraries. passing NULL as a handle will also try to lookup the symbol
+ * in currently loaded libraries. fix pointed out and supplied by:
+ * David Gero <dgero@nortelnetworks.com>
+ */
+ handle = NULL;
+ }
+ if (shl_findsym ((shl_t*) &handle, symbol_name, TYPE_UNDEFINED, &p) != 0 ||
+ handle == NULL || p == NULL)
+ {
+ /* the hp-docs say we should better abort() if errno==ENOSYM ;( */
+ g_module_set_error (g_strerror (errno));
+ }
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, ".sl", NULL);
+ else if (strncmp (module_name, "lib", 3) == 0)
+ return g_strdup (module_name);
+ else
+ return g_strconcat ("lib", module_name, ".sl", NULL);
+}
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