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/* Test the fdopen function.
Copyright (C) 2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xunistd.h>
#include <support/temp_file.h>
char *tmp_dir;
char *path_to_file;
void
prepare_tmp_dir (void)
{
tmp_dir = support_create_temp_directory ("tst-fdopen2");
path_to_file = xasprintf ("%s/tst-fdopen2.txt", tmp_dir);
}
/* open temp file descriptor with mode. */
int
open_tmp_fd (int mode)
{
int fd = xopen (path_to_file, mode, 0644);
return fd;
}
/* close and remove temp file with close. */
void
close_tmp_fd (int fd)
{
xclose (fd);
xunlink (path_to_file);
}
/* close and remove temp file with fclose. */
void
close_tmp_fp (FILE *fp)
{
fclose (fp);
xunlink (path_to_file);
}
/* test "w" fdopen mode. */
void
do_test_fdopen_w (void)
{
int fd, ret;
FILE *fp;
fd = open_tmp_fd (O_WRONLY | O_CREAT | O_TRUNC);
/* test mode mismatch. */
fp = fdopen (fd, "r");
if (fp != NULL || errno != EINVAL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, r) should fail with EINVAL: %m", fd);
}
fp = fdopen (fd, "w");
if (fp == NULL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, w): %m", fd);
}
const void *buf = "AAAA";
ret = fwrite (buf, 1, 4, fp);
if (ret != 4)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fwrite (): %m");
}
unsigned char buf2[4];
rewind (fp);
clearerr (fp);
/* fread should fail in "w" mode */
ret = fread (buf2, 1, 4, fp);
if (ret != 0 || ferror (fp) == 0)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fread should fail in \"w\" mode");
}
fclose (fp);
}
/* test "r" fdopen mode. */
void
do_test_fdopen_r (void)
{
int fd, ret;
FILE *fp;
fd = open_tmp_fd (O_RDONLY);
/* test mode mismatch. */
fp = fdopen (fd, "w");
if (fp != NULL || errno != EINVAL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, w) should fail with EINVAL: %m", fd);
}
fp = fdopen (fd, "r");
if (fp == NULL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, w): %m", fd);
}
const void *buf = "BBBB";
/* fwrite should fail in "r" mode. */
ret = fwrite (buf, 1, 4, fp);
if (ret != 0 || ferror (fp) == 0)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fwrite should fail in \"r\" mode");
}
unsigned char buf2[4];
ret = fread (buf2, 1, 4, fp);
if (ret != 4)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fread (): %m");
}
fclose (fp);
}
/* test "a" fdopen mode. */
void
do_test_fdopen_a (void)
{
int fd, ret;
FILE *fp;
fd = open_tmp_fd (O_WRONLY | O_CREAT | O_APPEND);
/* test mode mismatch. */
fp = fdopen (fd, "r+");
if (fp != NULL || errno != EINVAL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, \"r+\") should fail with EINVAL: %m", fd);
}
fp = fdopen (fd, "a");
if (fp == NULL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, w): %m", fd);
}
const void *buf = "CCCC";
ret = fwrite (buf, 1, 4, fp);
if (ret != 4)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fwrite (): %m");
}
/* fread should fail in "a" mode. */
unsigned char buf2[4];
clearerr (fp);
ret = fread (buf2, 1, 4, fp);
if (ret != 0 || ferror (fp) == 0)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fread should fail \"a\" mode");
}
fclose (fp);
}
void
do_test_fdopen_mode (int mode, const char *fmode)
{
int fd, ret;
FILE *fp;
fd = open_tmp_fd (mode);
fp = fdopen (fd, fmode);
if (fp == NULL)
{
close_tmp_fd (fd);
FAIL_EXIT1 ("fdopen (%d, %s): %m", fd, fmode);
}
const void *buf = "EEEE";
ret = fwrite (buf, 1, 4, fp);
if (ret != 4)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fwrite () in mode:%s returns %d: %m", fmode, ret);
}
rewind (fp);
unsigned char buf2[4];
ret = fread (buf2, 1, 4, fp);
if (ret != 4)
{
close_tmp_fp (fp);
FAIL_EXIT1 ("fread () in mode:%s returns %d: %m", fmode, ret);
}
fclose (fp);
}
static int
do_test (void)
{
prepare_tmp_dir ();
do_test_fdopen_w ();
do_test_fdopen_r ();
do_test_fdopen_a ();
/* test r+ w+ a+ fdopen modes. */
do_test_fdopen_mode (O_RDWR, "r+");
do_test_fdopen_mode (O_RDWR | O_CREAT | O_TRUNC, "w+");
do_test_fdopen_mode (O_RDWR | O_CREAT | O_APPEND, "a+");
xunlink (path_to_file);
return 0;
}
#include <support/test-driver.c>
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