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Add stub for ldd to examine libc binaries.

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1998-03-26 18:50  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/unix/sysv/linux/lddlibc4.c: New file.
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Ulrich Drepper 1998-03-26 18:53:12 +00:00
parent a35cb74d75
commit 528c1f1cb4
2 changed files with 91 additions and 0 deletions
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@ -1,3 +1,7 @@
1998-03-26 18:50 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/lddlibc4.c: New file.
1998-03-26 Andreas Jaeger <aj@arthur.rhein-neckar.de>
* manual/install.texi (Supported Configurations): Add

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sysdeps/unix/sysv/linux/lddlibc4.c Normal file
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/* Stub for ldd script to print Linux libc4 dependencies.
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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. */
/* This code is based on the `ldd' program code from the Linux ld.so
package. */
#include <a.out.h>
#include <errno.h>
#include <libintl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* Get libc version number. */
#include "../version.h"
#define PACKAGE _libc_intl_domainname
int
main (int argc, char *argv[])
{
const char *filename;
size_t filename_len;
struct exec exec;
char *buf;
FILE *fp;
/* Set locale via LC_ALL. */
setlocale (LC_ALL, "");
/* Set the text message domain. */
textdomain (PACKAGE);
/* We expect exactly one argument. */
if (argc != 2)
return 1;
filename = argv[1];
/* First see whether this is really an a.out binary. */
fp = fopen (filename, "rb");
if (fp == NULL)
error (2, errno, gettext ("cannot open `%s'"), filename);
/* Read the program header. */
if (fread (&exec, sizeof exec, 1, fp) < 1)
error (2, errno, gettext ("cannot read header from `%s'"), filename);
/* Test for the magic numbers. */
if (N_MAGIC (exec) != ZMAGIC && N_MAGIC (exec) != QMAGIC
&& N_MAGIC (exec) != OMAGIC)
exit (3);
/* We don't need the file open anymore. */
fclose (fp);
/* We must put `__LDD=ARGV0=<program-name>' in the environment. */
filename_len = strlen (filename);
buf = (char *) alloca (sizeof "__LDD_ARGV0=" + filename_len);
mempcpy (mempcpy (buf, "__LDD_ARGV0=", sizeof "__LDD_ARGV0=" - 1),
filename, filename_len);
/* ...and put the value in the environment. */
putenv (buf);
/* Now we can execute the binary. */
return execl (filename, NULL) ? 4 : 0;
}