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/* Test isatty() function.
Copyright (C) 2011-2023 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/>. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (isatty, int, (int));
#include <errno.h>
#include <fcntl.h>
#include "macros.h"
/* The name of the "always silent" device. */
#if defined _WIN32 && ! defined __CYGWIN__
/* Native Windows API. */
# define DEV_NULL "NUL"
#else
/* Unix API. */
# define DEV_NULL "/dev/null"
#endif
int
main (void)
{
const char *file = "test-isatty.txt";
/* Test behaviour for invalid file descriptors. */
{
errno = 0;
ASSERT (isatty (-1) == 0);
ASSERT (errno == EBADF
|| errno == 0 /* seen on IRIX 6.5, Solaris 10 */
);
}
{
close (99);
errno = 0;
ASSERT (isatty (99) == 0);
ASSERT (errno == EBADF
|| errno == 0 /* seen on IRIX 6.5, Solaris 10 */
);
}
/* Test behaviour for regular files. */
{
int fd;
fd = open (file, O_WRONLY|O_CREAT|O_TRUNC, 0644);
ASSERT (0 <= fd);
ASSERT (write (fd, "hello", 5) == 5);
ASSERT (close (fd) == 0);
fd = open (file, O_RDONLY);
ASSERT (0 <= fd);
ASSERT (! isatty (fd));
ASSERT (close (fd) == 0);
}
/* Test behaviour for pipes. */
{
int fd[2];
ASSERT (pipe (fd) == 0);
ASSERT (! isatty (fd[0]));
ASSERT (! isatty (fd[1]));
ASSERT (close (fd[0]) == 0);
ASSERT (close (fd[1]) == 0);
}
/* Test behaviour for /dev/null. */
{
int fd;
fd = open (DEV_NULL, O_RDONLY);
ASSERT (0 <= fd);
ASSERT (! isatty (fd));
ASSERT (close (fd) == 0);
}
ASSERT (unlink (file) == 0);
return 0;
}
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