1 /* Test the pwrite function.
2 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "signature.h"
22 SIGNATURE_CHECK (pwrite, ssize_t, (int, const void *, size_t, off_t));
24 #include <sys/types.h>
30 #define N (sizeof buf - 1)
35 char const *file = "out";
37 char buf[] = "0123456789";
44 fd = open (file, O_CREAT | O_WRONLY, 0600);
46 ASSERT (write (fd, buf, N) == N);
47 ASSERT (close (fd) == 0);
49 fd = open (file, O_WRONLY, 0600);
52 init_pos = lseek (fd, pos, SEEK_SET);
53 ASSERT (init_pos == pos);
55 for (i = 0; i < N; i+=2)
57 const char byte = 'W';
58 ASSERT (pwrite (fd, &byte, 1, i) == 1);
59 ASSERT (lseek (fd, 0, SEEK_CUR) == init_pos);
63 /* Invalid offset must evoke failure with EINVAL. */
64 const char byte = 'b';
65 ASSERT (pwrite (fd, &byte, 1, (off_t) -1) == -1);
66 ASSERT (errno == EINVAL);
69 ASSERT (close (fd) == 0);
72 fd = open (file, O_RDONLY);
74 ASSERT (read (fd, buf, N) == N);
75 ASSERT (close (fd) == 0);
76 ASSERT (strcmp ("W1W3W5W7W9",buf) == 0);