1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /******************************************************************************
3 *
4 * Copyright © International Business Machines Corp., 2009
5 *
6 * DESCRIPTION
7 * Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs
8 * from the expected one.
9 *
10 * AUTHOR
11 * Gowrishankar <gowrishankar.m@in.ibm.com>
12 *
13 * HISTORY
14 * 2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com>
15 *
16 *****************************************************************************/
17
18 #include <errno.h>
19 #include <getopt.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <time.h>
24 #include "futextest.h"
25 #include "logging.h"
26
27 #define TEST_NAME "futex-wait-wouldblock"
28 #define timeout_ns 100000
29
usage(char * prog)30 void usage(char *prog)
31 {
32 printf("Usage: %s\n", prog);
33 printf(" -c Use color\n");
34 printf(" -h Display this help message\n");
35 printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
36 VQUIET, VCRITICAL, VINFO);
37 }
38
main(int argc,char * argv[])39 int main(int argc, char *argv[])
40 {
41 struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
42 futex_t f1 = FUTEX_INITIALIZER;
43 int res, ret = RET_PASS;
44 int c;
45
46 while ((c = getopt(argc, argv, "cht:v:")) != -1) {
47 switch (c) {
48 case 'c':
49 log_color(1);
50 break;
51 case 'h':
52 usage(basename(argv[0]));
53 exit(0);
54 case 'v':
55 log_verbosity(atoi(optarg));
56 break;
57 default:
58 usage(basename(argv[0]));
59 exit(1);
60 }
61 }
62
63 ksft_print_header();
64 ksft_set_plan(1);
65 ksft_print_msg("%s: Test the unexpected futex value in FUTEX_WAIT\n",
66 basename(argv[0]));
67
68 info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
69 res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);
70 if (!res || errno != EWOULDBLOCK) {
71 fail("futex_wait returned: %d %s\n",
72 res ? errno : res, res ? strerror(errno) : "");
73 ret = RET_FAIL;
74 }
75
76 print_result(TEST_NAME, ret);
77 return ret;
78 }
79