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.
27 /* some flags are missing on some systems, so we provide
31 * BIND_IMMEDIATE - Resolve symbol references when the library is loaded.
32 * BIND_DEFERRED - Delay code symbol resolution until actual reference.
35 * BIND_FIRST - Place the library at the head of the symbol search order.
36 * BIND_NONFATAL - The default BIND_IMMEDIATE behavior is to treat all unsatisfied
37 * symbols as fatal. This flag allows binding of unsatisfied code
38 * symbols to be deferred until use.
39 * [Perl: For certain libraries, like DCE, deferred binding often
40 * causes run time problems. Adding BIND_NONFATAL to BIND_IMMEDIATE
41 * still allows unresolved references in situations like this.]
42 * BIND_NOSTART - Do not call the initializer for the shared library when the
43 * library is loaded, nor on a future call to shl_unload().
44 * BIND_VERBOSE - Print verbose messages concerning possible unsatisfied symbols.
46 * hp9000s700/hp9000s800:
47 * BIND_RESTRICTED - Restrict symbols visible by the library to those present at
49 * DYNAMIC_PATH - Allow the loader to dynamically search for the library specified
50 * by the path argument.
53 #define DYNAMIC_PATH 0
54 #endif /* DYNAMIC_PATH */
55 #ifndef BIND_RESTRICTED
56 #define BIND_RESTRICTED 0
57 #endif /* BIND_RESTRICTED */
59 #define OPT_BIND_FLAGS (BIND_NONFATAL | BIND_VERBOSE)
62 /* --- functions --- */
64 _g_module_open (const gchar *file_name,
69 shl_handle = shl_load (file_name,
70 (bind_lazy ? BIND_DEFERRED : BIND_IMMEDIATE) | OPT_BIND_FLAGS, 0);
73 /* the hp-docs say we should better abort() if errno==ENOSYM ;( */
74 g_module_set_error (g_strerror (errno));
77 return (gpointer) shl_handle;
85 shl_handle = PROG_HANDLE;
87 g_module_set_error (g_strerror (errno));
93 _g_module_close (gpointer handle,
98 if (shl_unload ((shl_t) handle) != 0)
99 g_module_set_error (g_strerror (errno));
104 _g_module_symbol (gpointer handle,
105 const gchar *symbol_name)
109 /* should we restrict lookups to TYPE_PROCEDURE?
111 if (shl_findsym ((shl_t*) &handle, symbol_name, TYPE_UNDEFINED, &p) != 0 ||
112 handle == NULL || p == NULL)
114 /* the hp-docs say we should better abort() if errno==ENOSYM ;( */
115 g_module_set_error (g_strerror (errno));
122 _g_module_build_path (const gchar *directory,
123 const gchar *module_name)
125 if (directory && *directory)
126 if (strncmp (module_name, "lib", 3) == 0)
127 return g_strconcat (directory, "/", module_name, NULL);
129 return g_strconcat (directory, "/lib", module_name, ".sl", NULL);
130 else if (strncmp (module_name, "lib", 3) == 0)
131 return g_strdup (module_name);
133 return g_strconcat ("lib", module_name, ".sl", NULL);