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[glibc.git] / sysdeps / generic / pread64.c
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1 /* Copyright (C) 1991, 1995, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <errno.h>
20 #include <unistd.h>
22 /* Read NBYTES into BUF from FD at the given position OFFSET without
23 changing the file pointer. Return the number read or -1. */
24 ssize_t
25 __pread64 (int fd, void *buf, size_t nbytes, off64_t offset)
27 if (nbytes == 0)
28 return 0;
29 if (fd < 0)
31 __set_errno (EBADF);
32 return -1;
34 if (buf == NULL || offset < 0)
36 __set_errno (EINVAL);
37 return -1;
40 __set_errno (ENOSYS);
41 return -1;
43 weak_alias (__pread64, pread64)
44 stub_warning (pread64)
45 #include <stub-tag.h>