AIX dl-open.

sysdeps/unix/sysv/aix/dl-open.c

@@ -1,9 +1,133 @@
-/* XXX The implementation of dlopen should somehow use the __loadx system
-   call but how?  */
+/* Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C 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.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <malloc.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <errno.h>
 #include <dlfcn.h>
+#include <dlldr.h>
+
+#define NUM_SHARED_OBJECTS 32
+
+int _dl_numso = NUM_SHARED_OBJECTS;
+DL_SODATA *_dl_sotable = NULL;
 
 void *
-__libc_dlopen (const char *file)
+_dl_open (const char *file, int mode, const void *caller)
 {
-  return (void *) 0;
+  DL_SODATA *new_so;
+  void *handle;
+  int entry;
+  int bsize = _dl_numso * sizeof (DL_INFO);
+  DL_INFO *dl_info = malloc (bsize);
+
+  if (dl_info == NULL)
+    return NULL;
+
+  /* 1st time thru initial shared object data table.  */
+  if (_dl_sotable == NULL)
+    {
+      _dl_sotable = (DL_SODATA *) calloc (_dl_numso, sizeof (DL_SODATA));
+      if (_dl_sotable == NULL)
+	return NULL;
+
+      __loadx (DL_POSTLOADQ, dl_info, bsize, NULL);
+      while (!(dl_info[0].dlinfo_xflags & DL_INFO_OK)
+	     || dl_info[0].dlinfo_arraylen == 0)
+	{
+	  bsize *= 2;
+	  dl_info = realloc (dl_info, bsize);
+	  if (dl_info == NULL)
+	    return NULL;
+
+	  __loadx (DL_POSTLOADQ, dl_info, bsize, NULL);
+	}
+    }
+
+  /* Validate mode bits.  */
+  if (!(mode & RTLD_NOW) && !(mode & RTLD_LAZY))
+    {
+      free (dl_info);
+      errno = EINVAL;
+      return NULL;
+    }
+
+  /* Load the module.  */
+  handle = (void *) __loadx (DL_LOAD | DL_LOAD_RTL | DL_LOAD_LDX1,
+                             dl_info, bsize, file, NULL);
+  if (handle == NULL)
+    {
+      free (dl_info);
+      errno = EINVAL;
+      return NULL;
+    }
+
+  /* Was dl_info buffer to small to get info.  */
+  while (!(dl_info[0].dlinfo_xflags & DL_INFO_OK)
+	 || dl_info[0].dlinfo_arraylen == 0)
+    {
+      bsize *= 2;
+      dl_info = realloc (dl_info, bsize);
+      if (new_dl_info == NULL)
+        {
+	  (void) __unload ((void *) handle);
+          errno = ENOMEM;
+          return NULL;
+        }
+      __loadx (DL_POSTLOADQ | DL_LOAD_RTL, dl_info, bsize, handle);
+    }
+
+  /* Get an empty entry in the shared object table.  */
+  for (entry = 0; entry < _dl_numso; ++entry)
+    if (_dl_sotable[entry].type == 0)
+      break;
+
+  /* See if the table needs to be increased.  */
+  if (entry == _dl_numso)
+    {
+      new_so = (DL_SODATA *) realloc (_dl_sotable,
+				      _dl_numso * 2 * sizeof (DL_SODATA));
+      if (new_so == NULL)
+	return NULL;
+
+      memset (new_so + _dl_numso, '\0', _dl_numso * sizeof (DL_SODATA));
+      _dl_numso  *= 2;
+      _dl_sotable = new_so;
+    }
+
+  /* See if this is syscall (look for /unix in file).  */
+  if (strcmp ("/unix", file) == 0)
+    {
+      _dl_sotable[entry].index = dl_info[1].dlinfo_index;
+      _dl_sotable[entry].dataorg = dl_info[1].dlinfo_dataorg;
+      _dl_sotable[entry].handle = handle;
+      _dl_sotable[entry].type = DL_UNIX_SYSCALL;
+    }
+  else
+    {
+      _dl_sotable[entry].index = dl_info[1].dlinfo_index;
+      _dl_sotable[entry].dataorg = dl_info[1].dlinfo_dataorg;
+      _dl_sotable[entry].handle = handle;
+      _dl_sotable[entry].type = DL_GETSYM;
+    }
+
+  free (dl_info);
+  return (void *) entry;
 }