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 TEST_NAME "futex-wait-wouldblock"
  32#define timeout_ns 100000
  33
  34void 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
  43int 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