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fac803a223
Mon Aug 10 03:35:57 1998 Tim Janik <timj@gtk.org>
* gmodule.c: minor changes to internal interface.
* gmodule-dl.c:
* gmodule-dld.c: put some comments into the files, and provided
better error checking for shl_findsym(). whish i had a system to
test this stuff on.
115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
/* GMODULE - GLIB wrapper code for dynamic module loading
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* Copyright (C) 1998 Tim Janik
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <dl.h>
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/* some flags are missing on some systems, so we provide
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* harmless defaults.
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*
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* Mandatory:
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* BIND_IMMEDIATE - Resolve symbol references when the library is loaded.
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* BIND_DEFERRED - Delay code symbol resolution until actual reference.
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*
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* Optionally:
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* BIND_FIRST - Place the library at the head of the symbol search order.
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* BIND_NONFATAL - The default BIND_IMMEDIATE behavior is to treat all unsatisfied
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* symbols as fatal. This flag allows binding of unsatisfied code
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* symbols to be deferred until use.
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* [Perl: For certain libraries, like DCE, deferred binding often
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* causes run time problems. Adding BIND_NONFATAL to BIND_IMMEDIATE
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* still allows unresolved references in situations like this.]
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* BIND_NOSTART - Do not call the initializer for the shared library when the
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* library is loaded, nor on a future call to shl_unload().
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* BIND_VERBOSE - Print verbose messages concerning possible unsatisfied symbols.
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*
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* hp9000s700/hp9000s800:
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* BIND_RESTRICTED - Restrict symbols visible by the library to those present at
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* library load time.
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* DYNAMIC_PATH - Allow the loader to dynamically search for the library specified
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* by the path argument.
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*/
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#ifndef DYNAMIC_PATH
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#define DYNAMIC_PATH 0
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#endif /* DYNAMIC_PATH */
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#ifndef BIND_RESTRICTED
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#define BIND_RESTRICTED 0
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#endif /* BIND_RESTRICTED */
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#define OPT_BIND_FLAGS (BIND_NONFATAL | BIND_VERBOSE)
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/* --- functions --- */
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static gpointer
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_g_module_open (const gchar *file_name,
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gboolean bind_lazy)
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{
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shl_t shl_handle;
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shl_handle = shl_load (file_name,
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(bind_lazy ? BIND_DEFERRED : BIND_IMMEDIATE) | OPT_BIND_FLAGS, 0);
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if (!shl_handle)
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{
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/* the hp-docs say we should better abort() if errno==ENOSYM ;( */
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g_module_set_error (g_strerror (errno));
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}
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return (gpointer) shl_handle;
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}
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static gpointer
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_g_module_self (void)
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{
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shl_t shl_handle;
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shl_handle = PROG_HANDLE;
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if (!shl_handle)
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g_module_set_error (g_strerror (errno));
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return shl_handle;
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}
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static void
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_g_module_close (gpointer handle,
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gboolean is_unref)
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{
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if (!is_unref)
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{
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if (shl_unload ((shl_t) handle) != 0)
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g_module_set_error (g_strerror (errno));
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}
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}
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static gpointer
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_g_module_symbol (gpointer handle,
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const gchar *symbol_name)
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{
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gpointer p = NULL;
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/* should we restrict lookups to TYPE_PROCEDURE?
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*/
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if (shl_findsym ((shl_t*) &handle, symbol_name, TYPE_UNDEFINED, &p) != 0 ||
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handle == NULL || p == NULL)
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{
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/* the hp-docs say we should better abort() if errno==ENOSYM ;( */
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g_module_set_error (g_strerror (errno));
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}
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return p;
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}
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