// SPDX-License-Identifier: GPL-2.0-or-later
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/******************************************************************************
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*
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* Copyright FUJITSU LIMITED 2010
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* Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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*
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* DESCRIPTION
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* Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should
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* return immediately. This test is intent to test zero page handling in
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* futex.
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*
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* AUTHOR
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* KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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*
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* HISTORY
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* 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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*
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*****************************************************************************/
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <syscall.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <errno.h>
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#include <linux/futex.h>
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#include <libgen.h>
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#include "logging.h"
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#include "futextest.h"
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#define TEST_NAME "futex-wait-uninitialized-heap"
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#define WAIT_US 5000000
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static int child_blocked = 1;
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static int child_ret;
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void *buf;
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void usage(char *prog)
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{
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printf("Usage: %s\n", prog);
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printf(" -c Use color\n");
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printf(" -h Display this help message\n");
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printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
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VQUIET, VCRITICAL, VINFO);
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}
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void *wait_thread(void *arg)
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{
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int res;
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child_ret = RET_PASS;
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res = futex_wait(buf, 1, NULL, 0);
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child_blocked = 0;
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if (res != 0 && errno != EWOULDBLOCK) {
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error("futex failure\n", errno);
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child_ret = RET_ERROR;
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}
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pthread_exit(NULL);
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}
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int main(int argc, char **argv)
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{
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int c, ret = RET_PASS;
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long page_size;
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pthread_t thr;
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while ((c = getopt(argc, argv, "chv:")) != -1) {
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switch (c) {
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case 'c':
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log_color(1);
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break;
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case 'h':
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usage(basename(argv[0]));
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exit(0);
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case 'v':
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log_verbosity(atoi(optarg));
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break;
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default:
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usage(basename(argv[0]));
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exit(1);
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}
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}
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page_size = sysconf(_SC_PAGESIZE);
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buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
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if (buf == (void *)-1) {
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error("mmap\n", errno);
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exit(1);
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}
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ksft_print_header();
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ksft_set_plan(1);
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ksft_print_msg("%s: Test the uninitialized futex value in FUTEX_WAIT\n",
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basename(argv[0]));
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ret = pthread_create(&thr, NULL, wait_thread, NULL);
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if (ret) {
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error("pthread_create\n", errno);
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ret = RET_ERROR;
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goto out;
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}
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info("waiting %dus for child to return\n", WAIT_US);
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usleep(WAIT_US);
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ret = child_ret;
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if (child_blocked) {
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fail("child blocked in kernel\n");
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ret = RET_FAIL;
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}
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out:
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print_result(TEST_NAME, ret);
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return ret;
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}
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