1 /* Test of fseeko() function.
2 Copyright (C) 2011-2021 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 <https://www.gnu.org/licenses/>. */
27 main (int argc, char **argv)
29 const char *filename = argv[1];
31 /* Test that fseeko() sets errno if someone else closes the stream
32 fd behind the back of stdio. */
34 FILE *fp = fopen (filename, "r");
36 setvbuf (fp, NULL, _IONBF, 0);
37 ASSERT (ftell (fp) == 0);
38 ASSERT (fseeko (fp, 0, SEEK_END) == 0);
39 ASSERT (ftell (fp) > 0);
40 ASSERT (close (fileno (fp)) == 0);
42 ASSERT (fseeko (fp, 0, SEEK_SET) == -1);
43 ASSERT (errno == EBADF);
47 /* Test that fseeko() sets errno if the stream was constructed with
48 an invalid file descriptor. */
50 FILE *fp = fdopen (-1, "w");
54 ASSERT (fseeko (fp, 0, SEEK_END) == -1);
55 ASSERT (errno == EBADF);
62 fp = fdopen (99, "w");
66 ASSERT (fseeko (fp, 0, SEEK_END) == -1);
67 ASSERT (errno == EBADF);