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 timeout_ns 100000
32 
33 void usage(char *prog)
34 {
35 	printf("Usage: %s\n", prog);
36 	printf("  -c	Use color\n");
37 	printf("  -h	Display this help message\n");
38 	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
39 	       VQUIET, VCRITICAL, VINFO);
40 }
41 
42 int main(int argc, char *argv[])
43 {
44 	struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
45 	futex_t f1 = FUTEX_INITIALIZER;
46 	int res, ret = RET_PASS;
47 	int c;
48 
49 	while ((c = getopt(argc, argv, "cht:v:")) != -1) {
50 		switch (c) {
51 		case 'c':
52 			log_color(1);
53 			break;
54 		case 'h':
55 			usage(basename(argv[0]));
56 			exit(0);
57 		case 'v':
58 			log_verbosity(atoi(optarg));
59 			break;
60 		default:
61 			usage(basename(argv[0]));
62 			exit(1);
63 		}
64 	}
65 
66 	printf("%s: Test the unexpected futex value in FUTEX_WAIT\n",
67 	       basename(argv[0]));
68 
69 	info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
70 	res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);
71 	if (!res || errno != EWOULDBLOCK) {
72 		fail("futex_wait returned: %d %s\n",
73 		     res ? errno : res, res ? strerror(errno) : "");
74 		ret = RET_FAIL;
75 	}
76 
77 	print_result(ret);
78 	return ret;
79 }
80