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. Neither the name of the author nor the names of any co-contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32#include "namespace.h"
33#include <sys/types.h>
34#include <sys/signalvar.h>
35#include <errno.h>
36#include <pthread.h>
37#include <signal.h>
38#include <string.h>
39#include "un-namespace.h"
40#include "thr_private.h"
41
42int	__sigsuspend(const sigset_t * set);
43
44__weak_reference(__sigsuspend, sigsuspend);
45
46int
47_sigsuspend(const sigset_t *set)
48{
49	struct pthread	*curthread = _get_curthread();
50	sigset_t	oldmask, newmask, tempset;
51	int             ret = -1;
52
53	if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
54		return (__sys_sigsuspend(set));
55
56	/* Check if a new signal set was provided by the caller: */
57	if (set != NULL) {
58		newmask = *set;
59		SIG_CANTMASK(newmask);
60		THR_LOCK_SWITCH(curthread);
61
62		/* Save current sigmask: */
63		oldmask = curthread->sigmask;
64		curthread->oldsigmask = &oldmask;
65
66		/* Change the caller's mask: */
67		curthread->sigmask = newmask;
68		tempset = curthread->sigpend;
69		SIGSETNAND(tempset, newmask);
70		if (SIGISEMPTY(tempset)) {
71			THR_SET_STATE(curthread, PS_SIGSUSPEND);
72			/* Wait for a signal: */
73			_thr_sched_switch_unlocked(curthread);
74		} else {
75			curthread->check_pending = 1;
76			THR_UNLOCK_SWITCH(curthread);
77			/* check pending signal I can handle: */
78			_thr_sig_check_pending(curthread);
79		}
80		if ((curthread->cancelflags & THR_CANCELLING) != 0)
81			curthread->oldsigmask = NULL;
82		else {
83			THR_ASSERT(curthread->oldsigmask == NULL,
84		 	          "oldsigmask is not cleared");
85		}
86
87		/* Always return an interrupted error: */
88		errno = EINTR;
89	} else {
90		/* Return an invalid argument error: */
91		errno = EINVAL;
92	}
93
94	/* Return the completion status: */
95	return (ret);
96}
97
98int
99__sigsuspend(const sigset_t * set)
100{
101	struct pthread *curthread = _get_curthread();
102	int		ret;
103
104	_thr_cancel_enter(curthread);
105	ret = _sigsuspend(set);
106	_thr_cancel_leave(curthread, 1);
107
108	return (ret);
109}
110