/****************************************************************************** * * Copyright © International Business Machines Corp., 2009 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * DESCRIPTION * Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs * from the expected one. * * AUTHOR * Gowrishankar <gowrishankar.m@in.ibm.com> * * HISTORY * 2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com> * *****************************************************************************/ #include <errno.h> #include <getopt.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include "futextest.h" #include "logging.h" #define TEST_NAME "futex-wait-wouldblock" #define timeout_ns 100000 void usage(char *prog) { printf("Usage: %s\n", prog); printf(" -c Use color\n"); printf(" -h Display this help message\n"); printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", VQUIET, VCRITICAL, VINFO); } int main(int argc, char *argv[]) { struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns}; futex_t f1 = FUTEX_INITIALIZER; int res, ret = RET_PASS; int c; while ((c = getopt(argc, argv, "cht:v:")) != -1) { switch (c) { case 'c': log_color(1); break; case 'h': usage(basename(argv[0])); exit(0); case 'v': log_verbosity(atoi(optarg)); break; default: usage(basename(argv[0])); exit(1); } } ksft_print_header(); ksft_print_msg("%s: Test the unexpected futex value in FUTEX_WAIT\n", basename(argv[0])); info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1); res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG); if (!res || errno != EWOULDBLOCK) { fail("futex_wait returned: %d %s\n", res ? errno : res, res ? strerror(errno) : ""); ret = RET_FAIL; } print_result(TEST_NAME, ret); return ret; }