misc/lseek.c

   1 /* Copyright (C) 1991, 1995, 1996, 1997, 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <unistd.h>
  21 #include <sys/types.h>
  22
  23 /* Seek to OFFSET on FD, starting from WHENCE.  */
  24 off_t
  25 __lseek (fd, offset, whence)
  26      int fd;
  27      off_t offset;
  28      int whence;
  29 {
  30   if (fd < 0)
  31     {
  32       __set_errno (EBADF);
  33       return -1;
  34     }
  35   switch (whence)
  36     {
  37     case SEEK_SET:
  38     case SEEK_CUR:
  39     case SEEK_END:
  40       break;
  41     default:
  42       __set_errno (EINVAL);
  43       return -1;
  44     }
  45
  46   __set_errno (ENOSYS);
  47   return -1;
  48 }
  49 stub_warning (lseek)
  50 libc_hidden_def (__lseek)
  51
  52 weak_alias (__lseek, lseek)
  53 #include <stub-tag.h>