Add stub for ldd to examine libc binaries.

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

	* sysdeps/unix/sysv/linux/lddlibc4.c: New file.

2 files changed, 91 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index de1327b57d..69d80cb953 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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
diff --git a/sysdeps/unix/sysv/linux/lddlibc4.c b/sysdeps/unix/sysv/linux/lddlibc4.c
new file mode 100644
index 0000000000..9de3dc8738
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/lddlibc4.c
@@ -0,0 +1,87 @@
+/* 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;
+}