1 /****************************************************************************** 2 * 3 * Copyright FUJITSU LIMITED 2010 4 * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * DESCRIPTION 12 * Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should 13 * return immediately. This test is intent to test zero page handling in 14 * futex. 15 * 16 * AUTHOR 17 * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 18 * 19 * HISTORY 20 * 2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 21 * 22 *****************************************************************************/ 23 24 #include <pthread.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <sys/mman.h> 28 #include <syscall.h> 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <unistd.h> 32 #include <errno.h> 33 #include <linux/futex.h> 34 #include <libgen.h> 35 36 #include "logging.h" 37 #include "futextest.h" 38 39 #define WAIT_US 5000000 40 41 static int child_blocked = 1; 42 static int child_ret; 43 void *buf; 44 45 void usage(char *prog) 46 { 47 printf("Usage: %s\n", prog); 48 printf(" -c Use color\n"); 49 printf(" -h Display this help message\n"); 50 printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", 51 VQUIET, VCRITICAL, VINFO); 52 } 53 54 void *wait_thread(void *arg) 55 { 56 int res; 57 58 child_ret = RET_PASS; 59 res = futex_wait(buf, 1, NULL, 0); 60 child_blocked = 0; 61 62 if (res != 0 && errno != EWOULDBLOCK) { 63 error("futex failure\n", errno); 64 child_ret = RET_ERROR; 65 } 66 pthread_exit(NULL); 67 } 68 69 int main(int argc, char **argv) 70 { 71 int c, ret = RET_PASS; 72 long page_size; 73 pthread_t thr; 74 75 while ((c = getopt(argc, argv, "chv:")) != -1) { 76 switch (c) { 77 case 'c': 78 log_color(1); 79 break; 80 case 'h': 81 usage(basename(argv[0])); 82 exit(0); 83 case 'v': 84 log_verbosity(atoi(optarg)); 85 break; 86 default: 87 usage(basename(argv[0])); 88 exit(1); 89 } 90 } 91 92 page_size = sysconf(_SC_PAGESIZE); 93 94 buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE, 95 MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); 96 if (buf == (void *)-1) { 97 error("mmap\n", errno); 98 exit(1); 99 } 100 101 printf("%s: Test the uninitialized futex value in FUTEX_WAIT\n", 102 basename(argv[0])); 103 104 105 ret = pthread_create(&thr, NULL, wait_thread, NULL); 106 if (ret) { 107 error("pthread_create\n", errno); 108 ret = RET_ERROR; 109 goto out; 110 } 111 112 info("waiting %dus for child to return\n", WAIT_US); 113 usleep(WAIT_US); 114 115 ret = child_ret; 116 if (child_blocked) { 117 fail("child blocked in kernel\n"); 118 ret = RET_FAIL; 119 } 120 121 out: 122 print_result(ret); 123 return ret; 124 } 125