1 /******************************************************************************
2 *
3 * Copyright © International Business Machines Corp., 2009
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * DESCRIPTION
11 * Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs
12 * from the expected one.
13 *
14 * AUTHOR
15 * Gowrishankar <gowrishankar.m@in.ibm.com>
16 *
17 * HISTORY
18 * 2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com>
19 *
20 *****************************************************************************/
21
22 #include <errno.h>
23 #include <getopt.h>
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <time.h>
28 #include "futextest.h"
29 #include "logging.h"
30
31 #define TEST_NAME "futex-wait-wouldblock"
32 #define timeout_ns 100000
33
usage(char * prog)34 void usage(char *prog)
35 {
36 printf("Usage: %s\n", prog);
37 printf(" -c Use color\n");
38 printf(" -h Display this help message\n");
39 printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
40 VQUIET, VCRITICAL, VINFO);
41 }
42
main(int argc,char * argv[])43 int main(int argc, char *argv[])
44 {
45 struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
46 futex_t f1 = FUTEX_INITIALIZER;
47 int res, ret = RET_PASS;
48 int c;
49
50 while ((c = getopt(argc, argv, "cht:v:")) != -1) {
51 switch (c) {
52 case 'c':
53 log_color(1);
54 break;
55 case 'h':
56 usage(basename(argv[0]));
57 exit(0);
58 case 'v':
59 log_verbosity(atoi(optarg));
60 break;
61 default:
62 usage(basename(argv[0]));
63 exit(1);
64 }
65 }
66
67 ksft_print_header();
68 ksft_print_msg("%s: Test the unexpected futex value in FUTEX_WAIT\n",
69 basename(argv[0]));
70
71 info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
72 res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);
73 if (!res || errno != EWOULDBLOCK) {
74 fail("futex_wait returned: %d %s\n",
75 res ? errno : res, res ? strerror(errno) : "");
76 ret = RET_FAIL;
77 }
78
79 print_result(TEST_NAME, ret);
80 return ret;
81 }
82