sysdeps/unix/sysv/linux/lddlibc4.c

   1 /* Stub for ldd script to print Linux libc4 dependencies.
   2    Copyright (C) 1998 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library 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 /* This code is based on the `ldd' program code from the Linux ld.so
  22    package.  */
  23
  24 #include <a.out.h>
  25 #include <errno.h>
  26 #include <libintl.h>
  27 #include <locale.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 /* Get libc version number.  */
  34 #include "../version.h"
  35
  36 #define PACKAGE _libc_intl_domainname
  37
  38
  39 int
  40 main (int argc, char *argv[])
  41 {
  42   const char *filename;
  43   size_t filename_len;
  44   struct exec exec;
  45   char *buf;
  46   FILE *fp;
  47
  48   /* Set locale via LC_ALL.  */
  49   setlocale (LC_ALL, "");
  50
  51   /* Set the text message domain.  */
  52   textdomain (PACKAGE);
  53
  54   /* We expect exactly one argument.  */
  55   if (argc != 2)
  56     return 1;
  57
  58   filename = argv[1];
  59
  60   /* First see whether this is really an a.out binary.  */
  61   fp = fopen (filename, "rb");
  62   if (fp == NULL)
  63     error (2, errno, gettext ("cannot open `%s'"), filename);
  64
  65   /* Read the program header.  */
  66   if (fread (&exec, sizeof exec, 1, fp) < 1)
  67     error (2, errno, gettext ("cannot read header from `%s'"), filename);
  68
  69   /* Test for the magic numbers.  */
  70   if (N_MAGIC (exec) != ZMAGIC && N_MAGIC (exec) != QMAGIC
  71       && N_MAGIC (exec) != OMAGIC)
  72     exit (3);
  73
  74   /* We don't need the file open anymore.  */
  75   fclose (fp);
  76
  77   /* We must put `__LDD=ARGV0=<program-name>' in the environment.  */
  78   filename_len = strlen (filename);
  79   buf = (char *) alloca (sizeof "__LDD_ARGV0=" + filename_len);
  80   mempcpy (mempcpy (buf, "__LDD_ARGV0=", sizeof "__LDD_ARGV0=" - 1),
  81            filename, filename_len);
  82   /* ...and put the value in the environment.  */
  83   putenv (buf);
  84
  85   /* Now we can execute the binary.  */
  86   return execl (filename, NULL) ? 4 : 0;
  87 }