elf/dl-support.c

   1 /* Support for dynamic linking code in static libc.
   2    Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 /* This file defines some things that for the dynamic linker are defined in
  21    rtld.c and dl-sysdep.c in ways appropriate to bootstrap dynamic linking.  */
  22
  23 #include <link.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <dl-machine.h>
  27
  28 extern char *__progname;
  29 char **_dl_argv = &__progname;  /* This is checked for some error messages.  */
  30
  31 /* This defines the default search path for libraries.
  32    For the dynamic linker it is set by -rpath when linking.  */
  33 const char *_dl_rpath = DEFAULT_RPATH;
  34
  35 /* Name of the architecture.  */
  36 const char *_dl_platform;
  37 size_t _dl_platformlen;
  38 int _dl_debug_libs;
  39 int _dl_debug_impcalls;
  40 int _dl_debug_bindings;
  41 int _dl_debug_symbols;
  42
  43 /* If nonzero print warnings about problematic situations.  */
  44 int _dl_verbose;
  45
  46 /* Structure to store information about search paths.  */
  47 struct r_search_path *_dl_search_paths;
  48
  49 /* We never do profiling.  */
  50 const char *_dl_profile;
  51 struct link_map *_dl_profile_map;
  52
  53
  54 static void non_dynamic_init (void) __attribute__ ((unused));
  55
  56 static void
  57 non_dynamic_init (void)
  58 {
  59   _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
  60
  61   _dl_pagesize = __getpagesize ();
  62
  63   /* Initialize the data structures for the search paths for shared
  64      objects.  */
  65   _dl_init_paths (getenv ("LD_LIBRARY_PATH"));
  66
  67 #ifdef DL_PLATFORM_INIT
  68   DL_PLATFORM_INIT;
  69 #endif
  70
  71   /* Now determine the length of the platform string.  */
  72   if (_dl_platform != NULL)
  73     _dl_platformlen = strlen (_dl_platform);
  74 }
  75 text_set_element (__libc_subinit, non_dynamic_init);