thr_wait4.c revision 67171 
1/*
2 * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: head/lib/libkse/thread/thr_wait4.c 67171 2000-10-15 20:04:09Z brian $
33 */
34#include <sys/types.h>
35
36#include <errno.h>
37#include <sys/wait.h>
38#ifdef _THREAD_SAFE
39#include <pthread.h>
40#include "pthread_private.h"
41
42pid_t
43_wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
44{
45	pid_t	ret;
46
47	_thread_kern_sig_defer();
48
49	/* Perform a non-blocking wait4 syscall: */
50	while ((ret = _thread_sys_wait4(pid, istat, options | WNOHANG, rusage)) == 0 && (options & WNOHANG) == 0) {
51		/* Reset the interrupted operation flag: */
52		_thread_run->interrupted = 0;
53
54		/* Schedule the next thread while this one waits: */
55		_thread_kern_sched_state(PS_WAIT_WAIT, __FILE__, __LINE__);
56
57		/* Check if this call was interrupted by a signal: */
58		if (_thread_run->interrupted) {
59			errno = EINTR;
60			ret = -1;
61			break;
62		}
63	}
64
65	_thread_kern_sig_undefer();
66
67	return (ret);
68}
69
70__strong_reference(_wait4, wait4);
71#endif
72