Tue Jun 4 02:25:44 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu>

	* elf/linux-compat.c (_init): Pass reloc_addr arg to _dl_lookup_symbol.

	* elf/dl-lookup.c (_dl_lookup_symbol): Use l_searchlist.

	* elf/dl-deps.c: New file.
	* elf/Makefile (rtld-routines): Add dl-deps.
	* elf/link.h: Declare _dl_map_object_deps, _dl_open.
	* elf/rtld.c (dl_main): Use _dl_map_object_deps.
	* elf/dlopen.c: Use _dl_open.

	* elf/rtld.c (dl_main): Remove BEFORE_RTLD variable and list
	frobnication based on its value.  Detach RTLD_MAP from the chain if
	its l_opencount is zero after loading deps.

	* elf/dlfcn.h (RTLD_BINDING_MASK): New macro.

	* elf/link.h (struct link_map): Replace l_deps_loaded flag member with
	`struct link_map **l_searchlist' and `unsigned int l_nsearchlist'.
	* elf/dl-lookup.c (_dl_lookup_symbol): Make SYMBOL_SCOPE arg an array
	of two link_map ptrs.  Search the maps in the l_searchlist of each
	elt that is not null.
	* elf/dl-reloc.c (_dl_relocate_object): Pass proper SCOPE array.
	* elf/dl-runtime.c: Likewise.
	* elf/dlsym.c: Likewise.
	* elf/rtld.c (dl_main): Likewise.

	* elf/dl-minimal.c (realloc): Support realloc of the block most
	recently returned by the minimal malloc.

	* intl/localealias.c, intl/dcgettext.c [_LIBC]: Define HAVE_ALLOCA.

1 files changed, 93 insertions, 0 deletions

diff --git a/elf/dl-deps.c b/elf/dl-deps.c
new file mode 100644
index 0000000000..f87475a670
--- /dev/null
+++ b/elf/dl-deps.c
@@ -0,0 +1,93 @@
+/* Load the dependencies of a mapped object.
+Copyright (C) 1996 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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <link.h>
+#include <errno.h>
+#include <dlfcn.h>
+#include <stdlib.h>
+
+void
+_dl_map_object_deps (struct link_map *map)
+{
+  unsigned int nlist = 1;
+  struct link_map **list = malloc (sizeof *list);
+  unsigned int done;
+
+  /* Start the search list with one element: MAP itself.  */
+  list[0] = map;
+
+  /* Process each element of the search list, loading each of its immediate
+     dependencies and appending them to the list as we step through it.
+     This produces a flat, ordered list that represents a breadth-first
+     search of the dependency tree.  */
+  for (done = 0; done < nlist; ++done)
+    {
+      struct link_map *l = list[done];
+      if (l->l_info[DT_NEEDED])
+	{
+	  const char *strtab
+	    = ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
+	  const Elf32_Dyn *d;
+	  for (d = l->l_ld; d->d_tag != DT_NULL; ++d)
+	    if (d->d_tag == DT_NEEDED)
+	      {
+		/* Extend the list and put this object on the end.  */
+		struct link_map **n
+		  = realloc (list, (nlist + 1) * sizeof *list);
+		if (n)
+		  list = n;
+		else
+		  {
+		    free (list);
+		    _dl_signal_error (ENOMEM, map->l_name,
+				      "finding dependencies");
+		  }
+		list[nlist++] = _dl_map_object (l, strtab + d->d_un.d_val);
+	      }
+	}
+    }
+
+  map->l_searchlist = list;
+  map->l_nsearchlist = nlist;
+}
+
+
+struct link_map *
+_dl_open (struct link_map *parent, const char *file, int mode)
+{
+  struct link_map *new, *l;
+  Elf32_Addr init;
+
+  /* Load the named object.  */
+  new = _dl_map_object (parent, file);
+
+  /* Load that object's dependencies.  */
+  _dl_map_object_deps (new);
+
+  /* Relocate the objects loaded.  */
+  for (l = new; l; l = l->l_next)
+    if (! l->l_relocated)
+      _dl_relocate_object (l, (mode & RTLD_BINDING_MASK) == RTLD_LAZY);
+
+  /* Run the initializer functions of new objects.  */
+  while (init = _dl_init_next ())
+    (*(void (*) (void)) init) ();
+
+  return new;
+}