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/* Test freopen cancellation handling.
Copyright (C) 2024-2025 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 <errno.h>
#include <fcntl.h>
#include <mcheck.h>
#include <pthread.h>
#include <semaphore.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>
#include <support/check.h>
#include <support/file_contents.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xstdio.h>
#include <support/xthread.h>
#include <support/xunistd.h>
char *file1, *file2, *file3, *fifo;
sem_t sem;
void *
test_rc_to_r (void *p)
{
int ret;
FILE *fp, *fp2;
ret = sem_post (&sem);
TEST_VERIFY_EXIT (ret == 0);
fp = xfopen (file1, "rc");
for (int i = 0; i < 1000000; i++)
{
fgetc (fp);
fseek (fp, 0, SEEK_SET);
}
fp2 = xfopen (file3, "wc");
fputs ("rc_to_r got to freopen", fp2);
xfclose (fp2);
/* Cancellation should occur at some point from here onwards
(possibly leaking memory and file descriptors associated with the
FILE). */
fp = FREOPEN (file2, "r", fp);
TEST_VERIFY_EXIT (fp != NULL);
for (;;)
{
fgetc (fp);
fseek (fp, 0, SEEK_SET);
}
}
void *
test_r_to_rc (void *p)
{
int ret;
FILE *fp;
fp = xfopen (file1, "r");
fp = FREOPEN (fifo, "rc", fp);
TEST_VERIFY_EXIT (fp != NULL);
ret = sem_post (&sem);
TEST_VERIFY_EXIT (ret == 0);
/* No cancellation should occur for I/O on fifo. */
ret = fgetc (fp);
/* At this point, the other thread has called pthread_cancel and
then written a byte to the fifo, so this thread is cancelled at
the next cancellation point. */
TEST_VERIFY (ret == 'x');
xfclose (fp);
fp = xfopen (file3, "wc");
fputs ("r_to_rc got to fclose", fp);
xfclose (fp);
pthread_testcancel ();
FAIL_EXIT1 ("test_r_to_rc not cancelled\n");
}
int
do_test (void)
{
char *temp_dir = support_create_temp_directory ("tst-freopen-cancel");
file1 = xasprintf ("%s/file1", temp_dir);
support_write_file_string (file1, "file1");
add_temp_file (file1);
file2 = xasprintf ("%s/file2", temp_dir);
support_write_file_string (file2, "file2");
add_temp_file (file2);
file3 = xasprintf ("%s/file3", temp_dir);
support_write_file_string (file3, "file3");
add_temp_file (file3);
fifo = xasprintf ("%s/fifo", temp_dir);
xmkfifo (fifo, 0666);
add_temp_file (fifo);
int ret;
pthread_t thr;
void *retval;
/* Test changing to/from c (cancellation disabled). */
verbose_printf ("Testing rc -> r\n");
ret = sem_init (&sem, 0, 0);
TEST_VERIFY_EXIT (ret == 0);
thr = xpthread_create (NULL, test_rc_to_r, NULL);
ret = sem_wait (&sem);
TEST_VERIFY_EXIT (ret == 0);
xpthread_cancel (thr);
ret = pthread_join (thr, &retval);
TEST_COMPARE (ret, 0);
TEST_VERIFY (retval == PTHREAD_CANCELED);
TEST_OPEN_AND_COMPARE_FILE_STRING (file3, "rc_to_r got to freopen");
verbose_printf ("Testing r -> rc\n");
ret = sem_init (&sem, 0, 0);
TEST_VERIFY_EXIT (ret == 0);
thr = xpthread_create (NULL, test_r_to_rc, NULL);
FILE *fp = xfopen (fifo, "w");
ret = sem_wait (&sem);
TEST_VERIFY_EXIT (ret == 0);
/* This call happens while, or before, the other thread is waiting
to read a character from the fifo. It thus verifies that
cancellation does not occur from the fgetc call in that thread
(it should instead occur only in pthread_testcancel call),
because the expected string is only written to file3 after that
thread closes the fifo. */
xpthread_cancel (thr);
fputc ('x', fp);
xfclose (fp);
ret = pthread_join (thr, &retval);
TEST_COMPARE (ret, 0);
TEST_VERIFY (retval == PTHREAD_CANCELED);
TEST_OPEN_AND_COMPARE_FILE_STRING (file3, "r_to_rc got to fclose");
free (temp_dir);
free (file1);
free (file2);
free (file3);
return 0;
}
#include <support/test-driver.c>
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