1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 * $FreeBSD$ 21 */ 22 23 /* 24 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 #pragma ident "@(#)rm_lnkcnt_zero_file.c 1.3 07/05/25 SMI" 29 30 /* 31 * -------------------------------------------------------------------- 32 * The purpose of this test is to see if the bug reported (#4723351) for 33 * UFS exists when using a ZFS file system. 34 * -------------------------------------------------------------------- 35 * 36 */ 37 #define _REENTRANT 1 38 #include <stdio.h> 39 #include <fcntl.h> 40 #include <pthread.h> 41 #include <errno.h> 42 #include <sys/types.h> 43 #include <sys/stat.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 static const int TRUE = 1; 48 static char *filebase; 49 50 static int 51 pickidx() 52 { 53 return (random() % 1000); 54 } 55 56 /* ARGSUSED */ 57 static void * 58 mover(void *a) 59 { 60 char buf[256]; 61 int idx, ret; 62 63 while (TRUE) { 64 idx = pickidx(); 65 (void) sprintf(buf, "%s.%03d", filebase, idx); 66 ret = rename(filebase, buf); 67 if (ret < 0 && errno != ENOENT) 68 (void) perror("renaming file"); 69 } 70 71 return (NULL); 72 } 73 74 /* ARGSUSED */ 75 static void * 76 cleaner(void *a) 77 { 78 char buf[256]; 79 int idx, ret; 80 81 while (TRUE) { 82 idx = pickidx(); 83 (void) sprintf(buf, "%s.%03d", filebase, idx); 84 ret = remove(buf); 85 if (ret < 0 && errno != ENOENT) 86 (void) perror("removing file"); 87 } 88 89 return (NULL); 90 } 91 92 static void * 93 writer(void *a) 94 { 95 int *fd = (int *)a; 96 97 while (TRUE) { 98 (void) close (*fd); 99 *fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644); 100 if (*fd < 0) 101 perror("refreshing file"); 102 (void) write(*fd, "test\n", 5); 103 } 104 105 return (NULL); 106 } 107 108 int 109 main(int argc, char **argv) 110 { 111 int fd; 112 pthread_t tid; 113 114 if (argc == 1) { 115 (void) printf("Usage: %s <filebase>\n", argv[0]); 116 exit(-1); 117 } 118 119 filebase = argv[1]; 120 fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644); 121 if (fd < 0) { 122 perror("creating test file"); 123 exit(-1); 124 } 125 126 if (pthread_setconcurrency(4)) { /* 3 threads + main */ 127 fprintf(stderr, "failed to set concurrency\n"); 128 exit(-1); 129 } 130 (void) pthread_create(&tid, NULL, mover, NULL); 131 (void) pthread_create(&tid, NULL, cleaner, NULL); 132 (void) pthread_create(&tid, NULL, writer, (void *) &fd); 133 134 while (TRUE) { 135 int ret; 136 struct stat st; 137 138 ret = stat(filebase, &st); 139 if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) { 140 (void) printf("st.st_nlink = %d, exiting\n", \ 141 (int)st.st_nlink); 142 exit(0); 143 } 144 (void) sleep(1); 145 } 146 147 return (0); 148 } 149