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

DEFINITIONS

1. usage
2. main

   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 
  30 void 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 
  39 int 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 }