86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* Test of opening a file stream.
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Copyright (C) 2007-2025 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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#include <config.h>
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#include <stdio.h>
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#include "signature.h"
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SIGNATURE_CHECK (freopen, FILE *, (char const *, char const *, FILE *));
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#include <errno.h>
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#include <unistd.h>
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#include "macros.h"
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int
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main ()
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{
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const char *filename = "test-freopen.txt";
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close (STDIN_FILENO);
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ASSERT (freopen ("/dev/null", "r", stdin) != NULL);
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ASSERT (getchar () == EOF);
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ASSERT (!ferror (stdin));
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ASSERT (feof (stdin));
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#if 0 /* freopen (NULL, ...) is unsupported on most platforms. */
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/* Test that freopen() sets errno if someone else closes the stream
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fd behind the back of stdio. */
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{
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FILE *fp = fopen (filename, "w+");
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ASSERT (fp != NULL);
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ASSERT (close (fileno (fp)) == 0);
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errno = 0;
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ASSERT (freopen (NULL, "r", fp) == NULL);
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perror("freopen");
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ASSERT (errno == EBADF);
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fclose (fp);
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}
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/* Test that freopen() sets errno if the stream was constructed with
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an invalid file descriptor. */
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{
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FILE *fp = fdopen (-1, "w+");
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if (fp != NULL)
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{
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errno = 0;
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ASSERT (freopen (NULL, "r", fp) == NULL);
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ASSERT (errno == EBADF);
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fclose (fp);
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}
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}
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{
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FILE *fp;
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close (99);
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fp = fdopen (99, "w+");
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if (fp != NULL)
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{
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errno = 0;
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ASSERT (freopen (NULL, "r", fp) == NULL);
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ASSERT (errno == EBADF);
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fclose (fp);
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}
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}
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#endif
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/* Clean up. */
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unlink (filename);
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return test_exit_status;
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}
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