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 https://opensource.org/licenses/CDDL-1.0. 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 if (testfile == NULL) 82 return (errno); 83 84 fd = open(testfile, O_CREAT | O_RDWR, mode); 85 if (fd < 0) { 86 err = errno; 87 perror("Failed to create testfile"); 88 free(testfile); 89 return (err); 90 } 91 92 llseek_ret = lseek64(fd, offset, SEEK_SET); 93 if (llseek_ret < 0) { 94 err = errno; 95 perror("Failed to seek to end of testfile"); 96 goto out; 97 } 98 99 write_ret = write(fd, mybuf, 1); 100 if (write_ret < 0) { 101 err = errno; 102 perror("Failed to write to end of file"); 103 goto out; 104 } 105 106 offset = 0; 107 llseek_ret = lseek64(fd, offset, SEEK_CUR); 108 if (llseek_ret < 0) { 109 err = errno; 110 perror("Failed to seek to end of file"); 111 goto out; 112 } 113 114 write_ret = write(fd, mybuf, 1); 115 if (write_ret < 0) { 116 if (errno == EFBIG || errno == EINVAL) { 117 (void) printf("write errno=EFBIG|EINVAL: success\n"); 118 err = 0; 119 } else { 120 err = errno; 121 perror("Did not receive EFBIG"); 122 } 123 } else { 124 (void) printf("write completed successfully, test failed\n"); 125 err = 1; 126 } 127 128 out: 129 (void) unlink(testfile); 130 free(testfile); 131 close(fd); 132 return (err); 133 } 134 135 static void 136 usage(char *name) 137 { 138 (void) printf("%s <testfile>\n", name); 139 exit(1); 140 } 141 142 static void 143 sigxfsz(int signo) 144 { 145 (void) signo; 146 (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n"); 147 } 148