1 /* Test of opening a file stream.
2 Copyright (C) 2007-2021 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/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
23 #include "signature.h"
24 SIGNATURE_CHECK (freopen, FILE *, (char const *, char const *, FILE *));
34 const char *filename = "test-freopen.txt";
37 ASSERT (freopen ("/dev/null", "r", stdin) != NULL);
38 ASSERT (getchar () == EOF);
39 ASSERT (!ferror (stdin));
40 ASSERT (feof (stdin));
42 #if 0 /* freopen (NULL, ...) is unsupported on most platforms. */
43 /* Test that freopen() sets errno if someone else closes the stream
44 fd behind the back of stdio. */
46 FILE *fp = fopen (filename, "w+");
48 ASSERT (close (fileno (fp)) == 0);
50 ASSERT (freopen (NULL, "r", fp) == NULL);
52 ASSERT (errno == EBADF);
56 /* Test that freopen() sets errno if the stream was constructed with
57 an invalid file descriptor. */
59 FILE *fp = fdopen (-1, "w+");
63 ASSERT (freopen (NULL, "r", fp) == NULL);
64 ASSERT (errno == EBADF);
71 fp = fdopen (99, "w+");
75 ASSERT (freopen (NULL, "r", fp) == NULL);
76 ASSERT (errno == EBADF);