--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/sysdll.c	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,293 @@
+/* sysdll.c --- system dependent support for dynamic linked libraries
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   Author:  William Perry <wmperry@aventail.com>
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs 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 General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to the Free
+Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "sysdll.h"
+
+/* This whole file is conditional upon HAVE_SHLIB */
+#ifdef HAVE_SHLIB
+
+/* Thankfully, most systems follow the ELFish dlopen() method.
+** HAVE__DLOPEN is lame, but SCO has their dl* functions as _dl*, and
+** unless you include dlfcn.h you don't get the macros to mask them, and
+** autoconf fails to find them. No longer true as of 5.0.5.
+**
+** Anybody who wants to use this on SCO needs to have their configure.in
+** look for _dlopen() as well as dlopen()
+*/
+#if defined(HAVE_DLOPEN) || defined(HAVE__DLOPEN) || defined(HAVE_DLFCN_H)
+#include <dlfcn.h>
+
+#ifndef RTLD_LAZY
+# define RTLD_LAZY 1
+#endif /* RTLD_LAZY isn't defined under FreeBSD - ick */
+
+#ifndef RTLD_GLOBAL
+# define RTLD_GLOBAL 0
+#endif
+
+int
+dll_init (CONST char *arg)
+{
+  return 0;
+}
+
+dll_handle
+dll_open (CONST char *fname)
+{
+  return (dll_handle)dlopen (fname, RTLD_LAZY | RTLD_GLOBAL);
+}
+
+int
+dll_close (dll_handle h)
+{
+  return dlclose((void *)h);
+}
+
+dll_func
+dll_function (dll_handle h, CONST char *n)
+{
+#ifdef DLSYM_NEEDS_UNDERSCORE
+  char *buf = alloca_array (char, strlen (n) + 2);
+  *buf = '_';
+  (void)strcpy(buf + 1, n);
+  n = buf;
+#endif
+  return (dll_func)dlsym ((void *)h, n);
+}
+
+dll_var
+dll_variable (dll_handle h, CONST char *n)
+{
+#ifdef DLSYM_NEEDS_UNDERSCORE
+  char *buf = alloca_array (char, strlen (n) + 2);
+  *buf = '_';
+  (void)strcpy(buf + 1, n);
+  n = buf;
+#endif
+  return (dll_var)dlsym ((void *)h, n);
+}
+
+CONST char *
+dll_error (dll_handle h)
+{
+#if defined(HAVE_DLERROR) || defined(dlerror)
+  return (CONST char *)dlerror ();
+#elif defined(HAVE__DLERROR)
+  return (const char *)_dlerror();
+#else
+  return "Shared library error";
+#endif
+}
+
+#elif defined(HAVE_SHL_LOAD)
+/* This is the HP/UX version */
+#include <dl.h>
+int
+dll_init (CONST char *arg)
+{
+  return 0;
+}
+
+dll_handle
+dll_open (CONST char *fname)
+{
+  shl_t h = shl_load (fname, BIND_DEFERRED,0L);
+  shl_t *hp = NULL;
+
+  if (h)
+    {
+      hp = (shl_t *)malloc (sizeof (shl_t));
+      if (!hp)
+	shl_unload(h);
+      else
+	*hp = h;
+    }
+  return (dll_handle)hp;
+}
+
+int
+dll_close (dll_handle h)
+{
+  shl_t hp = *((shl_t *)h);
+  free (hp);
+  return shl_unload(h);
+}
+
+dll_func
+dll_function (dll_handle h, CONST char *n)
+{
+  long handle = 0L;
+
+  if (shl_findsym ((shl_t *)h, n, TYPE_PROCEDURE, &handle))
+    return NULL;
+
+  return (dll_func)handle;
+}
+
+dll_var
+dll_variable (dll_handle h, CONST char *n)
+{
+  long handle = 0L;
+
+  if (shl_findsym ((shl_t *)h, n, TYPE_DATA, &handle))
+    return NULL;
+
+  return (dll_var)handle;
+}
+
+CONST char *
+dll_error (dll_handle h)
+{
+  /* #### WTF?!  Shouldn't this at least attempt to get strerror or
+     something?  --hniksic */
+  return "Generic shared library error";
+}
+
+#elif defined(HAVE_INIT_DLD)
+#include <dld.h>
+int
+dll_init (CONST char *arg)
+{
+  char *real_exe = dld_find_executable (arg);
+  int rc;
+
+  rc = dld_init (real_exe);
+  if (rc)
+    {
+      dld_perror (exe);
+      return -1;
+    }
+  return 0;
+}
+
+dll_handle
+dll_open (CONST char *fname)
+{
+  rc = dld_link (fname);
+  if (rc)
+    return NULL;
+
+  return (dll_handle)1;
+}
+
+int
+dll_close (dll_handle h)
+{
+  /* *sigh* DLD is pretty lame and doesn't return a handle that you can use
+  ** later on to free the file - you have to remember the filename and
+  ** use that as the unlinker.  We should eventually keep a linked list
+  ** of loaded modules and then use the node pointer as the unique id
+  ** for the shared library.  Wheeee.  But not now.
+  */
+  return 1;
+}
+
+DLL_FUNC
+dll_function (dll_handle h, CONST char *n)
+{
+  return dld_get_func(n);
+}
+
+DLL_FUNC
+dll_variable (dll_handle h, CONST char *n)
+{
+  return dld_get_symbol(n);
+}
+#elif defined(_WINDOWS) || defined(WIN32)
+int
+dll_init (CONST char *arg)
+{
+  return 0;
+}
+
+dll_handle
+dll_open (CONST char *fname)
+{
+  return (dll_handle)LoadLibrary (fname);
+}
+
+int
+dll_close (dll_handle h)
+{
+  return FreeLibrary (h);
+}
+
+dll_func
+dll_function (dll_handle h, CONST char *n)
+{
+  return (dll_func)GetProcAddress (h,n);
+}
+
+dll_func
+dll_variable (dll_handle h, CONST char *n)
+{
+  return (dll_func)GetProcAddress (h,n);
+}
+
+CONST char *
+dll_error (dll_handle h)
+{
+  return "Windows DLL Error";
+}
+#else
+/* Catchall if we don't know about this systems method of dynamic loading */
+int
+dll_init (CONST char *arg)
+{
+  return -1;
+}
+
+dll_handle
+dll_open (CONST char *fname)
+{
+  return NULL;
+}
+
+int
+dll_close (dll_handle h)
+{
+  return 0;
+}
+
+dll_func
+dll_function (dll_handle h, CONST char *n)
+{
+  return NULL;
+}
+
+dll_func
+dll_variable (dll_handle h, CONST char *n)
+{
+  return NULL;
+}
+
+CONST char *
+dll_error (dll_handle h)
+{
+  return "Shared libraries not implemented on this system";
+}
+#endif /* System conditionals */
+
+#endif /* HAVE_SHLIB */