1/******************************************************************************
2 *
3 * Copyright FUJITSU LIMITED 2010
4 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
5 *
6 *   This program is free software;  you can redistribute it and/or modify
7 *   it under the terms of the GNU General Public License as published by
8 *   the Free Software Foundation; either version 2 of the License, or
9 *   (at your option) any later version.
10 *
11 * DESCRIPTION
12 *      Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should
13 *      return immediately. This test is intent to test zero page handling in
14 *      futex.
15 *
16 * AUTHOR
17 *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
18 *
19 * HISTORY
20 *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
21 *
22 *****************************************************************************/
23
24#include <pthread.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <sys/mman.h>
28#include <syscall.h>
29#include <sys/types.h>
30#include <sys/stat.h>
31#include <unistd.h>
32#include <errno.h>
33#include <linux/futex.h>
34#include <libgen.h>
35
36#include "logging.h"
37#include "futextest.h"
38
39#define WAIT_US 5000000
40
41static int child_blocked = 1;
42static int child_ret;
43void *buf;
44
45void usage(char *prog)
46{
47	printf("Usage: %s\n", prog);
48	printf("  -c	Use color\n");
49	printf("  -h	Display this help message\n");
50	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
51	       VQUIET, VCRITICAL, VINFO);
52}
53
54void *wait_thread(void *arg)
55{
56	int res;
57
58	child_ret = RET_PASS;
59	res = futex_wait(buf, 1, NULL, 0);
60	child_blocked = 0;
61
62	if (res != 0 && errno != EWOULDBLOCK) {
63		error("futex failure\n", errno);
64		child_ret = RET_ERROR;
65	}
66	pthread_exit(NULL);
67}
68
69int main(int argc, char **argv)
70{
71	int c, ret = RET_PASS;
72	long page_size;
73	pthread_t thr;
74
75	while ((c = getopt(argc, argv, "chv:")) != -1) {
76		switch (c) {
77		case 'c':
78			log_color(1);
79			break;
80		case 'h':
81			usage(basename(argv[0]));
82			exit(0);
83		case 'v':
84			log_verbosity(atoi(optarg));
85			break;
86		default:
87			usage(basename(argv[0]));
88			exit(1);
89		}
90	}
91
92	page_size = sysconf(_SC_PAGESIZE);
93
94	buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
95		   MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
96	if (buf == (void *)-1) {
97		error("mmap\n", errno);
98		exit(1);
99	}
100
101	printf("%s: Test the uninitialized futex value in FUTEX_WAIT\n",
102	       basename(argv[0]));
103
104
105	ret = pthread_create(&thr, NULL, wait_thread, NULL);
106	if (ret) {
107		error("pthread_create\n", errno);
108		ret = RET_ERROR;
109		goto out;
110	}
111
112	info("waiting %dus for child to return\n", WAIT_US);
113	usleep(WAIT_US);
114
115	ret = child_ret;
116	if (child_blocked) {
117		fail("child blocked in kernel\n");
118		ret = RET_FAIL;
119	}
120
121 out:
122	print_result(ret);
123	return ret;
124}
125