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 "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 } 112