LXR linux/tools/testing/selftests/futex/functional/futex_wait

   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
  33void 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
  42int 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