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 "@(#)largest_file.c 1.3 07/05/25 SMI" 29 30 #include "file_common.h" 31 #include <sys/param.h> 32 #include <signal.h> 33 #include <stdio.h> 34 35 /* 36 * -------------------------------------------------------------- 37 * 38 * Assertion: 39 * The last byte of the largest file size can be 40 * accessed without any errors. Also, the writing 41 * beyond the last byte of the largest file size 42 * will produce an errno of EFBIG. 43 * 44 * -------------------------------------------------------------- 45 * If the write() system call below returns a "1", 46 * then the last byte can be accessed. 47 * -------------------------------------------------------------- 48 */ 49 static void sigxfsz(int); 50 static void usage(char *); 51 52 int 53 main(int argc, char **argv) 54 { 55 int fd = 0; 56 off_t offset = (OFF_MAX - 1); 57 off_t lseek_ret = 0; 58 int write_ret = 0; 59 int err = 0; 60 char mybuf[5]; 61 char *testfile; 62 63 if (argc != 2) { 64 usage(argv[0]); 65 } 66 67 (void) sigset(SIGXFSZ, sigxfsz); 68 69 testfile = strdup(argv[1]); 70 71 fd = open(testfile, O_CREAT | O_RDWR); 72 if (fd < 0) { 73 perror("Failed to create testfile"); 74 err = errno; 75 goto out; 76 } 77 78 lseek_ret = lseek(fd, offset, SEEK_SET); 79 if (lseek_ret < 0) { 80 perror("Failed to seek to end of testfile"); 81 err = errno; 82 goto out; 83 } 84 85 write_ret = write(fd, mybuf, 1); 86 if (write_ret < 0) { 87 perror("Failed to write to end of file"); 88 err = errno; 89 goto out; 90 } 91 92 offset = 0; 93 lseek_ret = lseek(fd, offset, SEEK_CUR); 94 if (lseek_ret < 0) { 95 perror("Failed to seek to end of file"); 96 err = errno; 97 goto out; 98 } 99 100 write_ret = write(fd, mybuf, 1); 101 if (write_ret < 0) { 102 if (errno == EFBIG) { 103 (void) printf("write errno=EFBIG: success\n"); 104 err = 0; 105 } else { 106 perror("Did not receive EFBIG"); 107 err = errno; 108 } 109 } else { 110 (void) printf("write completed successfully, test failed\n"); 111 err = 1; 112 } 113 114 out: 115 (void) unlink(testfile); 116 free(testfile); 117 return (err); 118 } 119 120 static void 121 usage(char *name) 122 { 123 (void) printf("%s <testfile>\n", name); 124 exit(1); 125 } 126 127 /* ARGSUSED */ 128 static void 129 sigxfsz(int signo) 130 { 131 (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n"); 132 } 133