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