glibc/elf/dl-misc.c

/* Miscellaneous support functions for dynamic linker
   Copyright (C) 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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.  */

#include <assert.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>

#ifndef MAP_ANON
/* This is the only dl-sysdep.c function that is actually needed at run-time
   by _dl_map_object.  */

int
_dl_sysdep_open_zero_fill (void)
{
  return __open ("/dev/zero", O_RDONLY);
}
#endif

/* Read the whole contents of FILE into new mmap'd space with given
   protections.  *SIZEP gets the size of the file.  */

void *
_dl_sysdep_read_whole_file (const char *file, size_t *sizep, int prot)
{
  void *result;
  struct stat st;
  int fd = __open (file, O_RDONLY);
  if (fd < 0)
    return NULL;
  if (__fxstat (_STAT_VER, fd, &st) < 0)
    result = NULL;
  else
    {
      /* Map a copy of the file contents.  */
      result = __mmap (0, st.st_size, prot,
#ifdef MAP_COPY
                       MAP_COPY
#else
                       MAP_PRIVATE
#endif
#ifdef MAP_FILE
                       | MAP_FILE
#endif
                       , fd, 0);
      if (result == (void *) -1)
        result = NULL;
      else
        *sizep = st.st_size;
    }
  __close (fd);
  return result;
}


void
_dl_sysdep_fatal (const char *msg, ...)
{
  va_list ap;

  va_start (ap, msg);
  do
    {
      size_t len = strlen (msg);
      __write (STDERR_FILENO, msg, len);
      msg = va_arg (ap, const char *);
    } while (msg);
  va_end (ap);

  _exit (127);
}


void
_dl_sysdep_error (const char *msg, ...)
{
  va_list ap;

  va_start (ap, msg);
  do
    {
      size_t len = strlen (msg);
      __write (STDERR_FILENO, msg, len);
      msg = va_arg (ap, const char *);
    } while (msg);
  va_end (ap);
}


void
_dl_sysdep_message (const char *msg, ...)
{
  va_list ap;

  va_start (ap, msg);
  do
    {
      size_t len = strlen (msg);
      __write (STDOUT_FILENO, msg, len);
      msg = va_arg (ap, const char *);
    } while (msg);
  va_end (ap);
}