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

   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 <[email protected]>
  12  *
  13  * HISTORY
  14  *      2009-Nov-14: Initial version by Gowrishankar <[email protected]>
  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 "futex2test.h"
  26 #include "logging.h"
  27
  28 #define TEST_NAME "futex-wait-wouldblock"
  29 #define timeout_ns 100000
  30
  31 void usage(char *prog)
  32 {
  33         printf("Usage: %s\n", prog);
  34         printf("  -c    Use color\n");
  35         printf("  -h    Display this help message\n");
  36         printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
  37                VQUIET, VCRITICAL, VINFO);
  38 }
  39
  40 int main(int argc, char *argv[])
  41 {
  42         struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
  43         futex_t f1 = FUTEX_INITIALIZER;
  44         int res, ret = RET_PASS;
  45         int c;
  46         struct futex_waitv waitv = {
  47                         .uaddr = (uintptr_t)&f1,
  48                         .val = f1+1,
  49                         .flags = FUTEX_32,
  50                         .__reserved = 0
  51                 };
  52
  53         while ((c = getopt(argc, argv, "cht:v:")) != -1) {
  54                 switch (c) {
  55                 case 'c':
  56                         log_color(1);
  57                         break;
  58                 case 'h':
  59                         usage(basename(argv[0]));
  60                         exit(0);
  61                 case 'v':
  62                         log_verbosity(atoi(optarg));
  63                         break;
  64                 default:
  65                         usage(basename(argv[0]));
  66                         exit(1);
  67                 }
  68         }
  69
  70         ksft_print_header();
  71         ksft_set_plan(2);
  72         ksft_print_msg("%s: Test the unexpected futex value in FUTEX_WAIT\n",
  73                basename(argv[0]));
  74
  75         info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
  76         res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);
  77         if (!res || errno != EWOULDBLOCK) {
  78                 ksft_test_result_fail("futex_wait returned: %d %s\n",
  79                                       res ? errno : res,
  80                                       res ? strerror(errno) : "");
  81                 ret = RET_FAIL;
  82         } else {
  83                 ksft_test_result_pass("futex_wait\n");
  84         }
  85
  86         if (clock_gettime(CLOCK_MONOTONIC, &to)) {
  87                 error("clock_gettime failed\n", errno);
  88                 return errno;
  89         }
  90
  91         to.tv_nsec += timeout_ns;
  92
  93         if (to.tv_nsec >= 1000000000) {
  94                 to.tv_sec++;
  95                 to.tv_nsec -= 1000000000;
  96         }
  97
  98         info("Calling futex_waitv on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
  99         res = futex_waitv(&waitv, 1, 0, &to, CLOCK_MONOTONIC);
 100         if (!res || errno != EWOULDBLOCK) {
 101                 ksft_test_result_pass("futex_waitv returned: %d %s\n",
 102                                       res ? errno : res,
 103                                       res ? strerror(errno) : "");
 104                 ret = RET_FAIL;
 105         } else {
 106                 ksft_test_result_pass("futex_waitv\n");
 107         }
 108
 109         ksft_print_cnts();
 110         return ret;
 111 }