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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /******************************************************************************
   3  *
   4  * Copyright FUJITSU LIMITED 2010
   5  * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
   6  *
   7  * DESCRIPTION
   8  *      Internally, Futex has two handling mode, anon and file. The private file
   9  *      mapping is special. At first it behave as file, but after write anything
  10  *      it behave as anon. This test is intent to test such case.
  11  *
  12  * AUTHOR
  13  *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
  14  *
  15  * HISTORY
  16  *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
  17  *
  18  *****************************************************************************/
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <syscall.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <linux/futex.h>
  26 #include <pthread.h>
  27 #include <libgen.h>
  28 #include <signal.h>
  29
  30 #include "logging.h"
  31 #include "futextest.h"
  32
  33 #define TEST_NAME "futex-wait-private-mapped-file"
  34 #define PAGE_SZ 4096
  35
  36 char pad[PAGE_SZ] = {1};
  37 futex_t val = 1;
  38 char pad2[PAGE_SZ] = {1};
  39
  40 #define WAKE_WAIT_US 3000000
  41 struct timespec wait_timeout = { .tv_sec = 5, .tv_nsec = 0};
  42
  43 void usage(char *prog)
  44 {
  45         printf("Usage: %s\n", prog);
  46         printf("  -c    Use color\n");
  47         printf("  -h    Display this help message\n");
  48         printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
  49                VQUIET, VCRITICAL, VINFO);
  50 }
  51
  52 void *thr_futex_wait(void *arg)
  53 {
  54         int ret;
  55
  56         info("futex wait\n");
  57         ret = futex_wait(&val, 1, &wait_timeout, 0);
  58         if (ret && errno != EWOULDBLOCK && errno != ETIMEDOUT) {
  59                 error("futex error.\n", errno);
  60                 print_result(TEST_NAME, RET_ERROR);
  61                 exit(RET_ERROR);
  62         }
  63
  64         if (ret && errno == ETIMEDOUT)
  65                 fail("waiter timedout\n");
  66
  67         info("futex_wait: ret = %d, errno = %d\n", ret, errno);
  68
  69         return NULL;
  70 }
  71
  72 int main(int argc, char **argv)
  73 {
  74         pthread_t thr;
  75         int ret = RET_PASS;
  76         int res;
  77         int c;
  78
  79         while ((c = getopt(argc, argv, "chv:")) != -1) {
  80                 switch (c) {
  81                 case 'c':
  82                         log_color(1);
  83                         break;
  84                 case 'h':
  85                         usage(basename(argv[0]));
  86                         exit(0);
  87                 case 'v':
  88                         log_verbosity(atoi(optarg));
  89                         break;
  90                 default:
  91                         usage(basename(argv[0]));
  92                         exit(1);
  93                 }
  94         }
  95
  96         ksft_print_header();
  97         ksft_set_plan(1);
  98         ksft_print_msg(
  99                 "%s: Test the futex value of private file mappings in FUTEX_WAIT\n",
 100                 basename(argv[0]));
 101
 102         ret = pthread_create(&thr, NULL, thr_futex_wait, NULL);
 103         if (ret < 0) {
 104                 fprintf(stderr, "pthread_create error\n");
 105                 ret = RET_ERROR;
 106                 goto out;
 107         }
 108
 109         info("wait a while\n");
 110         usleep(WAKE_WAIT_US);
 111         val = 2;
 112         res = futex_wake(&val, 1, 0);
 113         info("futex_wake %d\n", res);
 114         if (res != 1) {
 115                 fail("FUTEX_WAKE didn't find the waiting thread.\n");
 116                 ret = RET_FAIL;
 117         }
 118
 119         info("join\n");
 120         pthread_join(thr, NULL);
 121
 122  out:
 123         print_result(TEST_NAME, ret);
 124         return ret;
 125 }