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 /* 28 * Copyright (c) 2012 by Delphix. All rights reserved. 29 */ 30 31 #include "file_common.h" 32 #include <sys/param.h> 33 #include <signal.h> 34 #include <stdio.h> 35 #include <string.h> 36 #include <sys/stdtypes.h> 37 #include <unistd.h> 38 39 /* 40 * -------------------------------------------------------------- 41 * 42 * Assertion: 43 * The last byte of the largest file size can be 44 * accessed without any errors. Also, the writing 45 * beyond the last byte of the largest file size 46 * will produce an errno of EFBIG. 47 * 48 * -------------------------------------------------------------- 49 * If the write() system call below returns a "1", 50 * then the last byte can be accessed. 51 * -------------------------------------------------------------- 52 */ 53 static void sigxfsz(int); 54 static void usage(char *); 55 56 int 57 main(int argc, char **argv) 58 { 59 int fd = 0; 60 offset_t offset = (MAXOFFSET_T - 1); 61 offset_t llseek_ret = 0; 62 int write_ret = 0; 63 int err = 0; 64 char mybuf[5] = "aaaa\0"; 65 char *testfile; 66 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; 67 struct sigaction sa; 68 69 if (argc != 2) { 70 usage(argv[0]); 71 } 72 73 if (sigemptyset(&sa.sa_mask) == -1) 74 return (errno); 75 sa.sa_flags = 0; 76 sa.sa_handler = sigxfsz; 77 if (sigaction(SIGXFSZ, &sa, NULL) == -1) 78 return (errno); 79 80 testfile = strdup(argv[1]); 81 82 fd = open(testfile, O_CREAT | O_RDWR, mode); 83 if (fd < 0) { 84 err = errno; 85 perror("Failed to create testfile"); 86 free(testfile); 87 return (err); 88 } 89 90 llseek_ret = lseek64(fd, offset, SEEK_SET); 91 if (llseek_ret < 0) { 92 err = errno; 93 perror("Failed to seek to end of testfile"); 94 goto out; 95 } 96 97 write_ret = write(fd, mybuf, 1); 98 if (write_ret < 0) { 99 err = errno; 100 perror("Failed to write to end of file"); 101 goto out; 102 } 103 104 offset = 0; 105 llseek_ret = lseek64(fd, offset, SEEK_CUR); 106 if (llseek_ret < 0) { 107 err = errno; 108 perror("Failed to seek to end of file"); 109 goto out; 110 } 111 112 write_ret = write(fd, mybuf, 1); 113 if (write_ret < 0) { 114 if (errno == EFBIG || errno == EINVAL) { 115 (void) printf("write errno=EFBIG|EINVAL: success\n"); 116 err = 0; 117 } else { 118 err = errno; 119 perror("Did not receive EFBIG"); 120 } 121 } else { 122 (void) printf("write completed successfully, test failed\n"); 123 err = 1; 124 } 125 126 out: 127 (void) unlink(testfile); 128 free(testfile); 129 close(fd); 130 return (err); 131 } 132 133 static void 134 usage(char *name) 135 { 136 (void) printf("%s <testfile>\n", name); 137 exit(1); 138 } 139 140 static void 141 sigxfsz(int signo) 142 { 143 (void) signo; 144 (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n"); 145 } 146