88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* Test of opening a file stream.
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Copyright (C) 2020-2025 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>, 2020. */
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#include <config.h>
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/* Specification. */
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "macros.h"
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#define BASE "test-fopen-gnu.t"
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/* 0x1a is an EOF on Windows. */
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#define DATA "abc\x1axyz"
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int
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main (void)
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{
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FILE *f;
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int fd;
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int flags;
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char buf[16];
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/* Remove anything from prior partial run. */
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unlink (BASE "file");
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unlink (BASE "binary");
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/* Create the file. */
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f = fopen (BASE "file", "w");
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ASSERT (f);
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fd = fileno (f);
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ASSERT (fd >= 0);
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flags = fcntl (fd, F_GETFD);
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ASSERT (flags >= 0);
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ASSERT ((flags & FD_CLOEXEC) == 0);
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ASSERT (fclose (f) == 0);
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/* Create the file and check the 'e' mode. */
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f = fopen (BASE "file", "we");
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ASSERT (f);
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fd = fileno (f);
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ASSERT (fd >= 0);
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flags = fcntl (fd, F_GETFD);
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ASSERT (flags >= 0);
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ASSERT ((flags & FD_CLOEXEC) != 0);
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ASSERT (fclose (f) == 0);
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/* Open the file and check the 'x' mode. */
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f = fopen (BASE "file", "ax");
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ASSERT (f == NULL);
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ASSERT (errno == EEXIST);
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/* Open a binary file and check that the 'e' mode doesn't interfere. */
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f = fopen (BASE "binary", "wbe");
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ASSERT (f);
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ASSERT (fwrite (DATA, 1, sizeof (DATA)-1, f) == sizeof (DATA)-1);
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ASSERT (fclose (f) == 0);
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f = fopen (BASE "binary", "rbe");
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ASSERT (f);
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ASSERT (fread (buf, 1, sizeof (buf), f) == sizeof (DATA)-1);
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ASSERT (fclose (f) == 0);
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/* Cleanup. */
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ASSERT (unlink (BASE "file") == 0);
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ASSERT (unlink (BASE "binary") == 0);
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return test_exit_status;
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}
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