1 /*
2 * pread function
3 *
4 * Copyright 1996 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <errno.h>
25 #include <stdio.h>
26 #ifdef HAVE_UNISTD_H
27 # include <unistd.h>
28 #endif
29 #ifdef HAVE_IO_H
30 # include <io.h>
31 #endif
32
33
34 /* FIXME: this is not thread-safe */
35
36 #ifndef HAVE_PREAD
37 ssize_t pread( int fd, void *buf, size_t count, off_t offset )
38 {
39 ssize_t ret;
40 off_t old_pos;
41
42 if ((old_pos = lseek( fd, 0, SEEK_CUR )) == -1) return -1;
43 if (lseek( fd, offset, SEEK_SET ) == -1) return -1;
44 if ((ret = read( fd, buf, count )) == -1)
45 {
46 int err = errno; /* save errno */
47 lseek( fd, old_pos, SEEK_SET );
48 errno = err;
49 return -1;
50 }
51 if (lseek( fd, old_pos, SEEK_SET ) == -1) return -1;
52 return ret;
53 }
54 #endif /* HAVE_PREAD */
55
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