1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * CDDL HEADER START 4 * 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or https://opensource.org/licenses/CDDL-1.0. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* 29 * Copyright (c) 2012 by Delphix. All rights reserved. 30 */ 31 32 #include "file_common.h" 33 #include <sys/param.h> 34 #include <signal.h> 35 #include <stdio.h> 36 #include <string.h> 37 #include <sys/stdtypes.h> 38 #include <unistd.h> 39 40 /* 41 * -------------------------------------------------------------- 42 * 43 * Assertion: 44 * The last byte of the largest file size can be 45 * accessed without any errors. Also, the writing 46 * beyond the last byte of the largest file size 47 * will produce an errno of EFBIG. 48 * 49 * -------------------------------------------------------------- 50 * If the write() system call below returns a "1", 51 * then the last byte can be accessed. 52 * -------------------------------------------------------------- 53 */ 54 static void sigxfsz(int); 55 static void usage(char *); 56 57 int 58 main(int argc, char **argv) 59 { 60 int fd = 0; 61 offset_t offset = (MAXOFFSET_T - 1); 62 offset_t llseek_ret = 0; 63 int write_ret = 0; 64 int err = 0; 65 char mybuf[5] = "aaaa\0"; 66 char *testfile; 67 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; 68 struct sigaction sa; 69 70 if (argc != 2) { 71 usage(argv[0]); 72 } 73 74 if (sigemptyset(&sa.sa_mask) == -1) 75 return (errno); 76 sa.sa_flags = 0; 77 sa.sa_handler = sigxfsz; 78 if (sigaction(SIGXFSZ, &sa, NULL) == -1) 79 return (errno); 80 81 testfile = strdup(argv[1]); 82 if (testfile == NULL) 83 return (errno); 84 85 fd = open(testfile, O_CREAT | O_RDWR, mode); 86 if (fd < 0) { 87 err = errno; 88 perror("Failed to create testfile"); 89 free(testfile); 90 return (err); 91 } 92 93 llseek_ret = lseek64(fd, offset, SEEK_SET); 94 if (llseek_ret < 0) { 95 err = errno; 96 perror("Failed to seek to end of testfile"); 97 goto out; 98 } 99 100 write_ret = write(fd, mybuf, 1); 101 if (write_ret < 0) { 102 err = errno; 103 perror("Failed to write to end of file"); 104 goto out; 105 } 106 107 offset = 0; 108 llseek_ret = lseek64(fd, offset, SEEK_CUR); 109 if (llseek_ret < 0) { 110 err = errno; 111 perror("Failed to seek to end of file"); 112 goto out; 113 } 114 115 write_ret = write(fd, mybuf, 1); 116 if (write_ret < 0) { 117 if (errno == EFBIG || errno == EINVAL) { 118 (void) printf("write errno=EFBIG|EINVAL: success\n"); 119 err = 0; 120 } else { 121 err = errno; 122 perror("Did not receive EFBIG"); 123 } 124 } else { 125 (void) printf("write completed successfully, test failed\n"); 126 err = 1; 127 } 128 129 out: 130 (void) unlink(testfile); 131 free(testfile); 132 close(fd); 133 return (err); 134 } 135 136 static void 137 usage(char *name) 138 { 139 (void) printf("%s <testfile>\n", name); 140 exit(1); 141 } 142 143 static void 144 sigxfsz(int signo) 145 { 146 (void) signo; 147 (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n"); 148 } 149