26975322545b4173083d082311651210501989c2
[sfrench/cifs-2.6.git] / tools / testing / selftests / futex / functional / futex_wait_uninitialized_heap.c
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 TEST_NAME "futex-wait-uninitialized-heap"
40 #define WAIT_US 5000000
41
42 static int child_blocked = 1;
43 static int child_ret;
44 void *buf;
45
46 void usage(char *prog)
47 {
48         printf("Usage: %s\n", prog);
49         printf("  -c    Use color\n");
50         printf("  -h    Display this help message\n");
51         printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
52                VQUIET, VCRITICAL, VINFO);
53 }
54
55 void *wait_thread(void *arg)
56 {
57         int res;
58
59         child_ret = RET_PASS;
60         res = futex_wait(buf, 1, NULL, 0);
61         child_blocked = 0;
62
63         if (res != 0 && errno != EWOULDBLOCK) {
64                 error("futex failure\n", errno);
65                 child_ret = RET_ERROR;
66         }
67         pthread_exit(NULL);
68 }
69
70 int main(int argc, char **argv)
71 {
72         int c, ret = RET_PASS;
73         long page_size;
74         pthread_t thr;
75
76         while ((c = getopt(argc, argv, "chv:")) != -1) {
77                 switch (c) {
78                 case 'c':
79                         log_color(1);
80                         break;
81                 case 'h':
82                         usage(basename(argv[0]));
83                         exit(0);
84                 case 'v':
85                         log_verbosity(atoi(optarg));
86                         break;
87                 default:
88                         usage(basename(argv[0]));
89                         exit(1);
90                 }
91         }
92
93         page_size = sysconf(_SC_PAGESIZE);
94
95         buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
96                    MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
97         if (buf == (void *)-1) {
98                 error("mmap\n", errno);
99                 exit(1);
100         }
101
102         ksft_print_header();
103         ksft_print_msg("%s: Test the uninitialized futex value in FUTEX_WAIT\n",
104                basename(argv[0]));
105
106
107         ret = pthread_create(&thr, NULL, wait_thread, NULL);
108         if (ret) {
109                 error("pthread_create\n", errno);
110                 ret = RET_ERROR;
111                 goto out;
112         }
113
114         info("waiting %dus for child to return\n", WAIT_US);
115         usleep(WAIT_US);
116
117         ret = child_ret;
118         if (child_blocked) {
119                 fail("child blocked in kernel\n");
120                 ret = RET_FAIL;
121         }
122
123  out:
124         print_result(TEST_NAME, ret);
125         return ret;
126 }