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 } 79