gold/pread.c

   1 /* pread.c -- version of pread for gold.  */
   2
   3 /* Copyright (C) 2006-2017 Free Software Foundation, Inc.
   4    Written by Ian Lance Taylor <iant@google.com>.
   5
   6    This file is part of gold.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 /* This file implements pread for systems which don't have it.  This
  24    file is only compiled if pread is not present on the system.  This
  25    is not an exact version of pread, as it does not preserve the
  26    current file offset.  */
  27
  28 #include "config.h"
  29
  30 #include <stdio.h>
  31 #include <sys/types.h>
  32 #include <unistd.h>
  33
  34 extern ssize_t pread (int, void *, size_t, off_t);
  35
  36 ssize_t
  37 pread (int fd, void *buf, size_t count, off_t offset)
  38 {
  39   if (lseek(fd, offset, SEEK_SET) != offset)
  40     return -1;
  41   return read(fd, buf, count);
  42 }