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glibc  2.9
lseek.c
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00001 /* Copyright (C) 1991, 1995, 1996, 1997, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <unistd.h>
00021 #include <sys/types.h>
00022 
00023 /* Seek to OFFSET on FD, starting from WHENCE.  */
00024 off_t
00025 __lseek (fd, offset, whence)
00026      int fd;
00027      off_t offset;
00028      int whence;
00029 {
00030   if (fd < 0)
00031     {
00032       __set_errno (EBADF);
00033       return -1;
00034     }
00035   switch (whence)
00036     {
00037     case SEEK_SET:
00038     case SEEK_CUR:
00039     case SEEK_END:
00040       break;
00041     default:
00042       __set_errno (EINVAL);
00043       return -1;
00044     }
00045 
00046   __set_errno (ENOSYS);
00047   return -1;
00048 }
00049 stub_warning (lseek)
00050 libc_hidden_def (__lseek)
00051 
00052 weak_alias (__lseek, lseek)
00053 #include <stub-tag.h>