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glibc  2.9
Defines | Functions
lddlibc4.c File Reference
#include <a.out.h>
#include <errno.h>
#include <error.h>
#include <libintl.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../version.h"

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Defines

#define PACKAGE   _libc_intl_domainname

Functions

int main (int argc, char *argv[])

Define Documentation

Definition at line 37 of file lddlibc4.c.


Function Documentation

int main ( int  argc,
char *  argv[] 
)

Definition at line 41 of file lddlibc4.c.

{
  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 + 1);
  /* ...and put the value in the environment.  */
  putenv (buf);

  /* Now we can execute the binary.  */
  return execv (filename, &argv[argc]) ? 4 : 0;
}

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