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
37 static sigjmp_buf env;
38
39 static void
interrupt(int sig)40 interrupt(int sig)
41 {
42 siglongjmp(env, sig);
43 }
44
45 int
main(int argc,char * argv[])46 main(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