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 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "@(#)rm_lnkcnt_zero_file.c 1.3 07/05/25 SMI" 28 29 /* 30 * -------------------------------------------------------------------- 31 * The purpose of this test is to see if the bug reported (#4723351) for 32 * UFS exists when using a ZFS file system. 33 * -------------------------------------------------------------------- 34 * 35 */ 36 #define _REENTRANT 1 37 #include <stdio.h> 38 #include <fcntl.h> 39 #include <pthread.h> 40 #include <errno.h> 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 static const int TRUE = 1; 47 static char *filebase; 48 49 static int 50 pickidx() 51 { 52 return (random() % 1000); 53 } 54 55 /* ARGSUSED */ 56 static void * 57 mover(void *a) 58 { 59 char buf[256]; 60 int idx, ret; 61 62 while (TRUE) { 63 idx = pickidx(); 64 (void) sprintf(buf, "%s.%03d", filebase, idx); 65 ret = rename(filebase, buf); 66 if (ret < 0 && errno != ENOENT) 67 (void) perror("renaming file"); 68 } 69 70 return (NULL); 71 } 72 73 /* ARGSUSED */ 74 static void * 75 cleaner(void *a) 76 { 77 char buf[256]; 78 int idx, ret; 79 80 while (TRUE) { 81 idx = pickidx(); 82 (void) sprintf(buf, "%s.%03d", filebase, idx); 83 ret = remove(buf); 84 if (ret < 0 && errno != ENOENT) 85 (void) perror("removing file"); 86 } 87 88 return (NULL); 89 } 90 91 static void * 92 writer(void *a) 93 { 94 int *fd = (int *)a; 95 96 while (TRUE) { 97 (void) close (*fd); 98 *fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644); 99 if (*fd < 0) 100 perror("refreshing file"); 101 (void) write(*fd, "test\n", 5); 102 } 103 104 return (NULL); 105 } 106 107 int 108 main(int argc, char **argv) 109 { 110 int fd; 111 pthread_t tid; 112 113 if (argc == 1) { 114 (void) printf("Usage: %s <filebase>\n", argv[0]); 115 exit(-1); 116 } 117 118 filebase = argv[1]; 119 fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644); 120 if (fd < 0) { 121 perror("creating test file"); 122 exit(-1); 123 } 124 125 if (pthread_setconcurrency(4)) { /* 3 threads + main */ 126 fprintf(stderr, "failed to set concurrency\n"); 127 exit(-1); 128 } 129 (void) pthread_create(&tid, NULL, mover, NULL); 130 (void) pthread_create(&tid, NULL, cleaner, NULL); 131 (void) pthread_create(&tid, NULL, writer, (void *) &fd); 132 133 while (TRUE) { 134 int ret; 135 struct stat st; 136 137 ret = stat(filebase, &st); 138 if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) { 139 (void) printf("st.st_nlink = %d, exiting\n", \ 140 (int)st.st_nlink); 141 exit(0); 142 } 143 (void) sleep(1); 144 } 145 146 return (0); 147 } 148