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// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
*
* Copyright FUJITSU LIMITED 2010
* Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
*
* DESCRIPTION
* Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should
* return immediately. This test is intent to test zero page handling in
* futex.
*
* AUTHOR
* KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
*
* HISTORY
* 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
*
*****************************************************************************/
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <linux/futex.h>
#include <libgen.h>
#include "futextest.h"
#include "../../kselftest_harness.h"
#define WAIT_US 5000000
static int child_blocked = 1;
static bool child_ret;
void *buf;
void *wait_thread(void *arg)
{
int res;
child_ret = true;
res = futex_wait(buf, 1, NULL, 0);
child_blocked = 0;
if (res != 0 && errno != EWOULDBLOCK) {
ksft_exit_fail_msg("futex failure\n");
child_ret = false;
}
pthread_exit(NULL);
}
TEST(futex_wait_uninitialized_heap)
{
long page_size;
pthread_t thr;
int ret;
page_size = sysconf(_SC_PAGESIZE);
buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
if (buf == (void *)-1)
ksft_exit_fail_msg("mmap\n");
ret = pthread_create(&thr, NULL, wait_thread, NULL);
if (ret)
ksft_exit_fail_msg("pthread_create\n");
ksft_print_dbg_msg("waiting %dus for child to return\n", WAIT_US);
usleep(WAIT_US);
if (child_blocked)
ksft_test_result_fail("child blocked in kernel\n");
if (!child_ret)
ksft_test_result_fail("child error\n");
}
TEST_HARNESS_MAIN
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