elf/dl-iteratephdr.c

   1 /* Get loaded objects program headers.
   2    Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public License as
   8    published by the Free Software Foundation; either version 2.1 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include <errno.h>
  22 #include <ldsodefs.h>
  23 #include <stddef.h>
  24 #include <bits/libc-lock.h>
  25
  26 static void
  27 cancel_handler (void *arg __attribute__((unused)))
  28 {
  29   __rtld_lock_unlock_recursive (GL(dl_load_lock));
  30 }
  31
  32 hidden_proto (__dl_iterate_phdr)
  33 int
  34 __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
  35                                     size_t size, void *data), void *data)
  36 {
  37   struct link_map *l;
  38   struct dl_phdr_info info;
  39   int ret = 0;
  40
  41   /* Make sure we are alone.  */
  42   __rtld_lock_lock_recursive (GL(dl_load_lock));
  43   __libc_cleanup_push (cancel_handler, 0);
  44
  45   for (l = GL(dl_loaded); l != NULL; l = l->l_next)
  46     {
  47       info.dlpi_addr = l->l_addr;
  48       info.dlpi_name = l->l_name;
  49       info.dlpi_phdr = l->l_phdr;
  50       info.dlpi_phnum = l->l_phnum;
  51       info.dlpi_adds = GL(dl_load_adds);
  52       info.dlpi_subs = GL(dl_load_adds) - GL(dl_nloaded);
  53       ret = callback (&info, sizeof (struct dl_phdr_info), data);
  54       if (ret)
  55         break;
  56     }
  57
  58   /* Release the lock.  */
  59   __libc_cleanup_pop (0);
  60   __rtld_lock_unlock_recursive (GL(dl_load_lock));
  61
  62   return ret;
  63 }
  64 hidden_def (__dl_iterate_phdr)
  65
  66 #ifdef SHARED
  67
  68 weak_alias (__dl_iterate_phdr, dl_iterate_phdr);
  69
  70 #else
  71
  72 /* dl-support.c defines these and initializes them early on.  */
  73 extern ElfW(Phdr) *_dl_phdr;
  74 extern size_t _dl_phnum;
  75
  76 int
  77 dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
  78                                   size_t size, void *data), void *data)
  79 {
  80   if (_dl_phnum != 0)
  81     {
  82       /* This entry describes this statically-linked program itself.  */
  83       struct dl_phdr_info info;
  84       int ret;
  85       info.dlpi_addr = 0;
  86       info.dlpi_name = "";
  87       info.dlpi_phdr = _dl_phdr;
  88       info.dlpi_phnum = _dl_phnum;
  89       info.dlpi_adds = GL(dl_load_adds);
  90       info.dlpi_subs = GL(dl_load_adds) - GL(dl_nloaded);
  91       ret = (*callback) (&info, sizeof (struct dl_phdr_info), data);
  92       if (ret)
  93         return ret;
  94     }
  95
  96   return __dl_iterate_phdr (callback, data);
  97 }
  98
  99
 100 #endif