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