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 2006 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#include <sys/ioctl.h>
28
29#include <assert.h>
30#include <setjmp.h>
31#include <signal.h>
32#include <unistd.h>
33#include <stdlib.h>
34#include <stdio.h>
35#include <fcntl.h>
36
37static sigjmp_buf env;
38
39static void
40interrupt(int sig)
41{
42	siglongjmp(env, sig);
43}
44
45int
46main(int argc, char *argv[])
47{
48	const char *file = "/dev/null";
49	size_t i, n;
50	int fds[10];
51	struct sigaction act;
52
53	if (argc > 1) {
54		(void) fprintf(stderr, "Usage: %s\n", argv[0]);
55		return (EXIT_FAILURE);
56	}
57
58	act.sa_handler = interrupt;
59	act.sa_flags = 0;
60
61	(void) sigemptyset(&act.sa_mask);
62	(void) sigaction(SIGUSR1, &act, NULL);
63
64	closefrom(0);
65	n = 0;
66
67	/*
68	 * With all of our file descriptors closed, wait here spinning in bogus
69	 * ioctl() calls until DTrace hits us with a SIGUSR1 to start the test.
70	 */
71	if (sigsetjmp(env, 1) == 0) {
72		for (;;)
73			(void) ioctl(-1, 0, NULL);
74	}
75
76	/*
77	 * To test the fds[] array, we open /dev/null (a file with reliable
78	 * pathname and properties) using various flags and seek offsets.
79	 */
80	fds[n++] = open(file, O_RDONLY);
81	fds[n++] = open(file, O_WRONLY);
82	fds[n++] = open(file, O_RDWR);
83
84	fds[n++] = open(file, O_RDWR | O_APPEND | O_CREAT |
85	    O_NOCTTY | O_NONBLOCK | O_NDELAY | O_SYNC | O_TRUNC | 0666);
86
87	fds[n++] = open(file, O_RDWR);
88	(void) lseek(fds[n - 1], 123, SEEK_SET);
89
90	/*
91	 * Once we have all the file descriptors in the state we want to test,
92	 * issue a bogus ioctl() on each fd with cmd 0 and arg NULL to whack
93	 * our DTrace script into recording the content of the fds[] array.
94	 */
95	for (i = 0; i < n; i++)
96		(void) ioctl(fds[i], 0, NULL);
97
98	assert(n <= sizeof (fds) / sizeof (fds[0]));
99	exit(0);
100}
101