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
main(int argc,char ** argv)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";
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
usage(char * name)137 usage(char *name)
138 {
139 (void) printf("%s <testfile>\n", name);
140 exit(1);
141 }
142
143 static void
sigxfsz(int signo)144 sigxfsz(int signo)
145 {
146 (void) signo;
147 (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n");
148 }
149