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