1/*
2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23/*
24 * Copyright (c) 1989, 1993
25 *	The Regents of the University of California.  All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 * 3. All advertising materials mentioning features or use of this software
36 *    must display the following acknowledgement:
37 *	This product includes software developed by the University of
38 *	California, Berkeley and its contributors.
39 * 4. Neither the name of the University nor the names of its contributors
40 *    may be used to endorse or promote products derived from this software
41 *    without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 */
55
56#if __DARWIN_UNIX03
57#ifdef VARIANT_CANCELABLE
58#include <pthread.h>
59#endif /* VARIANT_CANCELABLE */
60extern int __unix_conforming;
61#endif /* __DARWIN_UNIX03 */
62
63#include <sys/param.h>
64#include <signal.h>
65#include <errno.h>
66
67#ifndef BUILDING_VARIANT
68#if defined(__DYNAMIC__)
69extern int _sigaction_nobind (int sig, const struct sigaction *nsv, struct sigaction *osv);
70extern int _sigvec_nobind (int, struct sigvec *, struct sigvec *);
71#endif
72
73static int
74sigvec__(int signo,
75	 struct sigvec *sv,
76	 struct sigvec *osv,
77	 int bind)
78{
79	int ret;
80
81	if (sv)
82		sv->sv_flags ^= SV_INTERRUPT;	/* !SA_INTERRUPT */
83#if defined(__DYNAMIC__)
84        if (bind) {
85#endif
86            ret = sigaction(signo, (struct sigaction *)sv, (struct sigaction *)osv);
87#if defined(__DYNAMIC__)
88	} else {
89            ret = _sigaction_nobind(signo, (struct sigaction *)sv, (struct sigaction *)osv);
90        }
91#endif
92        if (ret == 0 && osv)
93		osv->sv_flags ^= SV_INTERRUPT;	/* !SA_INTERRUPT */
94	return (ret);
95}
96
97int
98sigvec(int signo,
99       struct sigvec *sv,
100       struct sigvec *osv)
101{
102    return sigvec__(signo, sv, osv, 1);
103}
104
105#if defined(__DYNAMIC__)
106int
107_sigvec_nobind(int signo,
108	       struct sigvec *sv,
109	       struct sigvec *osv)
110{
111    return sigvec__(signo, sv, osv, 0);
112}
113#endif
114
115int
116sigsetmask(int mask)
117{
118	int omask, n;
119
120	n = sigprocmask(SIG_SETMASK, (sigset_t *) &mask, (sigset_t *) &omask);
121	if (n)
122		return (n);
123	return (omask);
124}
125
126int
127sigblock(int mask)
128{
129	int omask, n;
130
131	n = sigprocmask(SIG_BLOCK, (sigset_t *) &mask, (sigset_t *) &omask);
132	if (n)
133		return (n);
134	return (omask);
135}
136#endif /* !BUILDING_VARIANT */
137
138#if __DARWIN_UNIX03
139int
140sigpause(int sig)
141{
142	sigset_t mask;
143
144	if (__unix_conforming == 0)
145		__unix_conforming = 1;
146#ifdef VARIANT_CANCELABLE
147	pthread_testcancel();
148#endif /* VARIANT_CANCELABLE */
149
150	if ((sig <= 0) || (sig >= NSIG)) {
151		errno = EINVAL;
152		return(-1);
153	}
154	if (sigprocmask(SIG_BLOCK, (sigset_t *) 0, (sigset_t *) &mask) < 0) {
155		return(-1);
156	}
157	sigdelset(&mask, sig);
158	return (sigsuspend(&mask));
159}
160#else
161int
162sigpause(int mask)
163{
164	return (sigsuspend((sigset_t *)&mask));
165}
166#endif /* __DARWIN_UNIX03 */
167
168#ifndef BUILDING_VARIANT
169int
170sighold(int sig)
171{
172	sigset_t mask;
173
174	if ((sig <= 0) || (sig >= NSIG)) {
175		errno = EINVAL;
176		return(-1);
177	}
178	sigemptyset(&mask);
179	sigaddset(&mask, sig);
180	return(sigprocmask(SIG_BLOCK, &mask,(sigset_t *)0));
181}
182
183int
184sigrelse(int sig)
185{
186	sigset_t mask;
187
188	if ((sig <= 0) || (sig >= NSIG)) {
189		errno = EINVAL;
190		return(-1);
191	}
192	sigemptyset(&mask);
193	sigaddset(&mask, sig);
194	return(sigprocmask(SIG_UNBLOCK, &mask,(sigset_t *)0));
195}
196
197
198int
199sigignore(int sig)
200{
201	return (signal(sig, SIG_IGN) == SIG_ERR ? -1 : 0);
202}
203
204void (*sigset(int sig, void (*disp)(int)))(int) {
205	sigset_t omask;
206	int blocked;
207	struct sigaction oact;
208
209	if ((sig <= 0) || (sig >= NSIG)) {
210		errno = EINVAL;
211		return (SIG_ERR);
212	}
213	if (-1 == sigprocmask(0, NULL, &omask))
214		return (SIG_ERR);
215	blocked = sigismember(&omask, sig);
216	if (disp == SIG_HOLD) {
217		if (blocked)
218			return (SIG_HOLD);
219		if ((-1 == sigaction(sig, NULL, &oact)) ||
220		    (-1 == sighold(sig)))
221			return (SIG_ERR);
222		return (sig_t)oact.sa_handler;
223	} else {
224		if (blocked) {
225			if (-1 == sigrelse(sig))
226				return (SIG_ERR);
227		}
228		sig_t rv = signal(sig, disp);
229		if (rv != SIG_ERR)
230			return blocked ? SIG_HOLD : rv;
231		else
232			return (rv);
233	}
234}
235#endif /* !BUILDING_VARIANT */
236