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
41 static int child_blocked = 1;
42 static int child_ret;
43 void *buf;
44
usage(char * prog)45 void 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
wait_thread(void * arg)54 void *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
main(int argc,char ** argv)69 int 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