1 /****************************************************************************** 2 * 3 * Copyright © International Business Machines Corp., 2009 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * DESCRIPTION 11 * Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs 12 * from the expected one. 13 * 14 * AUTHOR 15 * Gowrishankar <gowrishankar.m@in.ibm.com> 16 * 17 * HISTORY 18 * 2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com> 19 * 20 *****************************************************************************/ 21 22 #include <errno.h> 23 #include <getopt.h> 24 #include <stdio.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <time.h> 28 #include "futextest.h" 29 #include "logging.h" 30 31 #define timeout_ns 100000 32 33 void usage(char *prog) 34 { 35 printf("Usage: %s\n", prog); 36 printf(" -c Use color\n"); 37 printf(" -h Display this help message\n"); 38 printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", 39 VQUIET, VCRITICAL, VINFO); 40 } 41 42 int main(int argc, char *argv[]) 43 { 44 struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns}; 45 futex_t f1 = FUTEX_INITIALIZER; 46 int res, ret = RET_PASS; 47 int c; 48 49 while ((c = getopt(argc, argv, "cht:v:")) != -1) { 50 switch (c) { 51 case 'c': 52 log_color(1); 53 break; 54 case 'h': 55 usage(basename(argv[0])); 56 exit(0); 57 case 'v': 58 log_verbosity(atoi(optarg)); 59 break; 60 default: 61 usage(basename(argv[0])); 62 exit(1); 63 } 64 } 65 66 printf("%s: Test the unexpected futex value in FUTEX_WAIT\n", 67 basename(argv[0])); 68 69 info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1); 70 res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG); 71 if (!res || errno != EWOULDBLOCK) { 72 fail("futex_wait returned: %d %s\n", 73 res ? errno : res, res ? strerror(errno) : ""); 74 ret = RET_FAIL; 75 } 76 77 print_result(ret); 78 return ret; 79 } 80