1 /* Test truncating a file.
2 Copyright (C) 2011-2018 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 (ftruncate, int, (int, off_t));
23
24 #include <errno.h>
25 #include <fcntl.h>
26
27 #include "macros.h"
28
29 int
main(int argc,char * argv[])30 main (int argc, char *argv[])
31 {
32 const char *filename = argv[1];
33
34 /* Test behaviour for invalid file descriptors. */
35 {
36 errno = 0;
37 ASSERT (ftruncate (-1, 0) == -1);
38 ASSERT (errno == EBADF);
39 }
40 {
41 close (99);
42 errno = 0;
43 ASSERT (ftruncate (99, 0) == -1);
44 ASSERT (errno == EBADF);
45 }
46
47 /* Test behaviour for read-only file descriptors. */
48 {
49 int fd = open (filename, O_RDONLY);
50 ASSERT (fd >= 0);
51 errno = 0;
52 ASSERT (ftruncate (fd, 0) == -1);
53 ASSERT (errno == EBADF || errno == EINVAL
54 || errno == EACCES /* seen on mingw */
55 );
56 close (fd);
57 }
58
59 return 0;
60 }
61