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 */
53static void	sigxfsz(int);
54static void	usage(char *);
55
56int
57main(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
128out:
129	(void) unlink(testfile);
130	free(testfile);
131	close(fd);
132	return (err);
133}
134
135static void
136usage(char *name)
137{
138	(void) printf("%s <testfile>\n", name);
139	exit(1);
140}
141
142static void
143sigxfsz(int signo)
144{
145	(void) signo;
146	(void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n");
147}
148