/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <assert.h>
#include <setjmp.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
static sigjmp_buf env;
static void
interrupt(int sig)
{
siglongjmp(env, sig);
}
int
main(int argc, char *argv[])
{
const char *file = "/dev/null";
int i, n, fds[10];
struct sigaction act;
if (argc > 1) {
(void) fprintf(stderr, "Usage: %s\n", argv[0]);
return (EXIT_FAILURE);
}
act.sa_handler = interrupt;
act.sa_flags = 0;
(void) sigemptyset(&act.sa_mask);
(void) sigaction(SIGUSR1, &act, NULL);
closefrom(0);
n = 0;
/*
* With all of our file descriptors closed, wait here spinning in bogus
* ioctl() calls until DTrace hits us with a SIGUSR1 to start the test.
*/
if (sigsetjmp(env, 1) == 0) {
for (;;)
(void) ioctl(-1, -1, NULL);
}
/*
* To test the fds[] array, we open /dev/null (a file with reliable
* pathname and properties) using various flags and seek offsets.
*/
fds[n++] = open(file, O_RDONLY);
fds[n++] = open(file, O_WRONLY);
fds[n++] = open(file, O_RDWR);
fds[n++] = open(file, O_RDWR | O_APPEND | O_CREAT | O_DSYNC |
O_LARGEFILE | O_NOCTTY | O_NONBLOCK | O_NDELAY | O_RSYNC |
O_SYNC | O_TRUNC | O_XATTR);
fds[n++] = open(file, O_RDWR);
(void) lseek(fds[n - 1], 123, SEEK_SET);
/*
* Once we have all the file descriptors in the state we want to test,
* issue a bogus ioctl() on each fd with cmd -1 and arg NULL to whack
* our DTrace script into recording the content of the fds[] array.
*/
for (i = 0; i < n; i++)
(void) ioctl(fds[i], -1, NULL);
assert(n <= sizeof (fds) / sizeof (fds[0]));
exit(0);
}