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/* Check side-effect act for cancellable syscalls (BZ #12683).
Copyright (C) 2023 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/>. */
/* This testcase checks if there is resource leakage if the syscall has
returned from kernelspace, but before userspace saves the return
value. The 'leaker' thread should be able to close the file descriptor
if the resource is already allocated, meaning that if the cancellation
signal arrives *after* the open syscal return from kernel, the
side-effect should be visible to application. */
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <support/xunistd.h>
#include <support/xthread.h>
#include <support/check.h>
#include <support/temp_file.h>
#include <support/support.h>
#include <support/descriptors.h>
static void *
writeopener (void *arg)
{
int fd;
for (;;)
{
fd = open (arg, O_WRONLY);
xclose (fd);
}
return NULL;
}
static void *
leaker (void *arg)
{
int fd = open (arg, O_RDONLY);
TEST_VERIFY_EXIT (fd > 0);
pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, 0);
xclose (fd);
return NULL;
}
static int
do_test (void)
{
enum {
iter_count = 1000
};
char *dir = support_create_temp_directory ("tst-cancel28");
char *name = xasprintf ("%s/fifo", dir);
TEST_COMPARE (mkfifo (name, 0600), 0);
add_temp_file (name);
struct support_descriptors *descrs = support_descriptors_list ();
srand (1);
xpthread_create (NULL, writeopener, name);
for (int i = 0; i < iter_count; i++)
{
pthread_t td = xpthread_create (NULL, leaker, name);
struct timespec ts =
{ .tv_nsec = rand () % 100000, .tv_sec = 0 };
nanosleep (&ts, NULL);
/* Ignore pthread_cancel result because it might be the
case when pthread_cancel is called when thread is already
exited. */
pthread_cancel (td);
xpthread_join (td);
}
support_descriptors_check (descrs);
support_descriptors_free (descrs);
free (name);
return 0;
}
#include <support/test-driver.c>
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