tools/testing/selftests/futex/functional/futex_wait_wouldblock.c

   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
  34 void 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
  43 int 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 }