thr_sigsuspend.c revision 56698 
1/*
2 * Copyright (c) 1995 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_sigsuspend.c 56698 2000-01-27 23:07:25Z jasone $
33 */
34#include <signal.h>
35#include <errno.h>
36#ifdef _THREAD_SAFE
37#include <pthread.h>
38#include "pthread_private.h"
39
40int
41_sigsuspend(const sigset_t * set)
42{
43	int             ret = -1;
44	sigset_t        oset;
45
46	/* Check if a new signal set was provided by the caller: */
47	if (set != NULL) {
48		/* Save the current signal mask: */
49		oset = _thread_run->sigmask;
50
51		/* Change the caller's mask: */
52		_thread_run->sigmask = *set;
53
54		/* Wait for a signal: */
55		_thread_kern_sched_state(PS_SIGSUSPEND, __FILE__, __LINE__);
56
57		/* Always return an interrupted error: */
58		errno = EINTR;
59
60		/* Restore the signal mask: */
61		_thread_run->sigmask = oset;
62	} else {
63		/* Return an invalid argument error: */
64		errno = EINVAL;
65	}
66
67	/* Return the completion status: */
68	return (ret);
69}
70
71int
72sigsuspend(const sigset_t * set)
73{
74	int	ret;
75
76	_thread_enter_cancellation_point();
77	ret = _sigsuspend(set);
78	_thread_leave_cancellation_point();
79
80	return ret;
81}
82#endif
83