1 /* Test of fsync() function.
2 Copyright (C) 2008-2021 Free Software Foundation, Inc.
3
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.
8
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.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18
19 #include <unistd.h>
20
21 #include "signature.h"
22 SIGNATURE_CHECK (fsync, int, (int));
23
24 #include <errno.h>
25 #include <fcntl.h>
26
27 #include "macros.h"
28
29 int
main(void)30 main (void)
31 {
32 int fd;
33 const char *file = "test-fsync.txt";
34
35 /* Assuming stdin and stdout are ttys, fsync is allowed to fail, but
36 may succeed as an extension. */
37 for (fd = 0; fd < 2; fd++)
38 if (fsync (fd) != 0)
39 {
40 ASSERT (errno == EINVAL /* POSIX */
41 || errno == ENOTSUP /* seen on Mac OS X 10.5 */
42 || errno == EBADF /* seen on AIX 7.1 */
43 || errno == EIO /* seen on mingw */
44 );
45 }
46
47 /* fsync must fail on invalid fd. */
48 {
49 errno = 0;
50 ASSERT (fsync (-1) == -1);
51 ASSERT (errno == EBADF);
52 }
53 {
54 close (99);
55 errno = 0;
56 ASSERT (fsync (99) == -1);
57 ASSERT (errno == EBADF);
58 }
59
60 fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
61 ASSERT (0 <= fd);
62 ASSERT (write (fd, "hello", 5) == 5);
63 ASSERT (fsync (fd) == 0);
64 ASSERT (close (fd) == 0);
65
66 /* For a read-only regular file input file descriptor, fsync should
67 succeed (since at least atime changes can be synchronized).
68 On AIX and Cygwin, this test would fail. */
69 #if !(defined _AIX || defined __CYGWIN__)
70 fd = open (file, O_RDONLY);
71 ASSERT (0 <= fd);
72 {
73 char buf[1];
74 ASSERT (read (fd, buf, sizeof buf) == sizeof buf);
75 }
76 ASSERT (fsync (fd) == 0);
77 ASSERT (close (fd) == 0);
78 #endif
79
80 ASSERT (unlink (file) == 0);
81
82 return 0;
83 }
84