Use __getdents instead of __getdirentries in sparc __get_clockfreq_via_proc_openprom.
[glibc.git] / sysdeps / posix / pread64.c
blob0946b68f1c1664cedc5f74422aa1e63e919afa7d
1 /* Read block from given position in file without changing file pointer.
2 POSIX version.
3 Copyright (C) 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
7 The GNU C Library is free software; you can redistribute it and/or
8 modify it under the terms of the GNU Lesser General Public
9 License as published by the Free Software Foundation; either
10 version 2.1 of the License, or (at your option) any later version.
12 The GNU C Library is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 Lesser General Public License for more details.
17 You should have received a copy of the GNU Lesser General Public
18 License along with the GNU C Library; if not, see
19 <http://www.gnu.org/licenses/>. */
21 #include <errno.h>
22 #include <unistd.h>
24 /* Note: This implementation of pread64 is not multithread-safe. */
26 ssize_t
27 __libc_pread64 (int fd, void *buf, size_t nbyte, off64_t offset)
29 /* Since we must not change the file pointer preserve the value so that
30 we can restore it later. */
31 int save_errno;
32 ssize_t result;
33 off64_t old_offset = __libc_lseek64 (fd, 0, SEEK_CUR);
34 if (old_offset == (off64_t) -1)
35 return -1;
37 /* Set to wanted position. */
38 if (__libc_lseek64 (fd, offset, SEEK_SET) == (off64_t) -1)
39 return -1;
41 /* Write out the data. */
42 result = __libc_read (fd, buf, nbyte);
44 /* Now we have to restore the position. If this fails we have to
45 return this as an error. But if the writing also failed we
46 return this error. */
47 save_errno = errno;
48 if (__libc_lseek64 (fd, old_offset, SEEK_SET) == (off64_t) -1)
50 if (result == -1)
51 __set_errno (save_errno);
52 return -1;
54 __set_errno (save_errno);
56 return result;
59 #ifndef __libc_pread64
60 weak_alias (__libc_pread64, __pread64)
61 weak_alias (__libc_pread64, pread64)
62 #endif