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

   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
  30void 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
  39int 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