1 /* Test of ftello() function.
2 Copyright (C) 2011-2020 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 <stdio.h>
20
21 #include <errno.h>
22 #include <unistd.h>
23
24 #include "macros.h"
25
26 int
main(int argc,char ** argv)27 main (int argc, char **argv)
28 {
29 const char *filename = argv[1];
30
31 /* Test that ftello() sets errno if someone else closes the stream
32 fd behind the back of stdio. */
33 {
34 FILE *fp = fopen (filename, "r");
35 ASSERT (fp != NULL);
36 setvbuf (fp, NULL, _IONBF, 0);
37 ASSERT (close (fileno (fp)) == 0);
38 errno = 0;
39 ASSERT (ftello (fp) == (off_t)-1);
40 ASSERT (errno == EBADF);
41 fclose (fp);
42 }
43
44 /* Test that ftello() sets errno if the stream was constructed with
45 an invalid file descriptor. */
46 {
47 FILE *fp = fdopen (-1, "w");
48 if (fp != NULL)
49 {
50 errno = 0;
51 ASSERT (ftello (fp) == (off_t)-1);
52 ASSERT (errno == EBADF);
53 fclose (fp);
54 }
55 }
56 {
57 FILE *fp;
58 close (99);
59 fp = fdopen (99, "w");
60 if (fp != NULL)
61 {
62 errno = 0;
63 ASSERT (ftello (fp) == (off_t)-1);
64 ASSERT (errno == EBADF);
65 fclose (fp);
66 }
67 }
68
69 return 0;
70 }
71