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/* Test of opening a file stream.
Copyright (C) 2020-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
#include <config.h>
/* Specification. */
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include "macros.h"
#define BASE "test-fopen-gnu.t"
/* 0x1a is an EOF on Windows. */
#define DATA "abc\x1axyz"
int
main (void)
{
FILE *f;
int fd;
int flags;
char buf[16];
/* Remove anything from prior partial run. */
unlink (BASE "file");
unlink (BASE "binary");
/* Create the file. */
f = fopen (BASE "file", "w");
ASSERT (f);
fd = fileno (f);
ASSERT (fd >= 0);
flags = fcntl (fd, F_GETFD);
ASSERT (flags >= 0);
ASSERT ((flags & FD_CLOEXEC) == 0);
ASSERT (fclose (f) == 0);
/* Create the file and check the 'e' mode. */
f = fopen (BASE "file", "we");
ASSERT (f);
fd = fileno (f);
ASSERT (fd >= 0);
flags = fcntl (fd, F_GETFD);
ASSERT (flags >= 0);
ASSERT ((flags & FD_CLOEXEC) != 0);
ASSERT (fclose (f) == 0);
/* Open the file and check the 'x' mode. */
f = fopen (BASE "file", "ax");
ASSERT (f == NULL);
ASSERT (errno == EEXIST);
/* Open a binary file and check that the 'e' mode doesn't interfere. */
f = fopen (BASE "binary", "wbe");
ASSERT (f);
ASSERT (fwrite (DATA, 1, sizeof (DATA)-1, f) == sizeof (DATA)-1);
ASSERT (fclose (f) == 0);
f = fopen (BASE "binary", "rbe");
ASSERT (f);
ASSERT (fread (buf, 1, sizeof (buf), f) == sizeof (DATA)-1);
ASSERT (fclose (f) == 0);
/* Cleanup. */
ASSERT (unlink (BASE "file") == 0);
ASSERT (unlink (BASE "binary") == 0);
return 0;
}
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