svr4_signal.c revision 107838 
1/*
2 * Copyright (c) 1998 Mark Newton
3 * Copyright (c) 1994 Christos Zoulas
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/compat/svr4/svr4_signal.c 107838 2002-12-13 22:27:25Z alfred $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/filedesc.h>
34#include <sys/lock.h>
35#include <sys/mutex.h>
36#include <sys/proc.h>
37#include <sys/signal.h>
38#include <sys/signalvar.h>
39#include <sys/sysproto.h>
40
41#include <machine/cpu.h>
42
43#include <compat/svr4/svr4.h>
44#include <compat/svr4/svr4_types.h>
45#include <compat/svr4/svr4_signal.h>
46#include <compat/svr4/svr4_proto.h>
47#include <compat/svr4/svr4_util.h>
48#include <compat/svr4/svr4_ucontext.h>
49
50#define	svr4_sigmask(n)		(1 << (((n) - 1) & 31))
51#define	svr4_sigword(n)		(((n) - 1) >> 5)
52#define svr4_sigemptyset(s)	memset((s), 0, sizeof(*(s)))
53#define	svr4_sigismember(s, n)	((s)->bits[svr4_sigword(n)] & svr4_sigmask(n))
54#define	svr4_sigaddset(s, n)	((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n))
55
56void svr4_to_bsd_sigaction(const struct svr4_sigaction *, struct sigaction *);
57void bsd_to_svr4_sigaction(const struct sigaction *, struct svr4_sigaction *);
58void svr4_sigfillset(svr4_sigset_t *);
59
60int bsd_to_svr4_sig[SVR4_SIGTBLSZ] = {
61	SVR4_SIGHUP,
62	SVR4_SIGINT,
63	SVR4_SIGQUIT,
64	SVR4_SIGILL,
65	SVR4_SIGTRAP,
66	SVR4_SIGABRT,
67	SVR4_SIGEMT,
68	SVR4_SIGFPE,
69	SVR4_SIGKILL,
70	SVR4_SIGBUS,
71	SVR4_SIGSEGV,
72	SVR4_SIGSYS,
73	SVR4_SIGPIPE,
74	SVR4_SIGALRM,
75	SVR4_SIGTERM,
76	SVR4_SIGURG,
77	SVR4_SIGSTOP,
78	SVR4_SIGTSTP,
79	SVR4_SIGCONT,
80	SVR4_SIGCHLD,
81	SVR4_SIGTTIN,
82	SVR4_SIGTTOU,
83	SVR4_SIGIO,
84	SVR4_SIGXCPU,
85	SVR4_SIGXFSZ,
86	SVR4_SIGVTALRM,
87	SVR4_SIGPROF,
88	SVR4_SIGWINCH,
89	0,			/* SIGINFO */
90	SVR4_SIGUSR1,
91	SVR4_SIGUSR2,
92};
93
94int svr4_to_bsd_sig[SVR4_SIGTBLSZ] = {
95	SIGHUP,
96	SIGINT,
97	SIGQUIT,
98	SIGILL,
99	SIGTRAP,
100	SIGABRT,
101	SIGEMT,
102	SIGFPE,
103	SIGKILL,
104	SIGBUS,
105	SIGSEGV,
106	SIGSYS,
107	SIGPIPE,
108	SIGALRM,
109	SIGTERM,
110	SIGUSR1,
111	SIGUSR2,
112	SIGCHLD,
113	0,		/* XXX NetBSD uses SIGPWR here, but we don't seem to have one */
114	SIGWINCH,
115	SIGURG,
116	SIGIO,
117	SIGSTOP,
118	SIGTSTP,
119	SIGCONT,
120	SIGTTIN,
121	SIGTTOU,
122	SIGVTALRM,
123	SIGPROF,
124	SIGXCPU,
125	SIGXFSZ,
126};
127
128void
129svr4_sigfillset(s)
130	svr4_sigset_t *s;
131{
132	int i;
133
134	svr4_sigemptyset(s);
135	for (i = 0; i < SVR4_NSIG; i++)
136		if (svr4_to_bsd_sig[i] != 0)
137			svr4_sigaddset(s, i);
138}
139
140void
141svr4_to_bsd_sigset(sss, bss)
142	const svr4_sigset_t *sss;
143	sigset_t *bss;
144{
145	int i, newsig;
146
147	SIGEMPTYSET(*bss);
148	for (i = 0; i < SVR4_NSIG; i++)
149		if (svr4_sigismember(sss, i + 1)) {
150			newsig = svr4_to_bsd_sig[i];
151			if (newsig)
152				SIGADDSET(*bss, newsig);
153		}
154}
155
156void
157bsd_to_svr4_sigset(bss, sss)
158	const sigset_t *bss;
159	svr4_sigset_t *sss;
160{
161	int i, newsig;
162
163	svr4_sigemptyset(sss);
164	sss->bits[0] = bss->__bits[0] & ~((1U << SVR4_SIGTBLSZ) - 1);
165	sss->bits[1] = bss->__bits[1];
166	sss->bits[2] = bss->__bits[2];
167	sss->bits[3] = bss->__bits[3];
168	for (i = 1; i <= SVR4_SIGTBLSZ; i++) {
169		if (SIGISMEMBER(*bss, i)) {
170			newsig = bsd_to_svr4_sig[_SIG_IDX(i)];
171			if (newsig)
172				svr4_sigaddset(sss, newsig);
173		}
174	}
175}
176
177/*
178 * XXX: Only a subset of the flags is currently implemented.
179 */
180void
181svr4_to_bsd_sigaction(ssa, bsa)
182	const struct svr4_sigaction *ssa;
183	struct sigaction *bsa;
184{
185
186	bsa->sa_handler = (sig_t) ssa->ssa_handler;
187	svr4_to_bsd_sigset(&ssa->ssa_mask, &bsa->sa_mask);
188	bsa->sa_flags = 0;
189	if ((ssa->ssa_flags & SVR4_SA_ONSTACK) != 0)
190		bsa->sa_flags |= SA_ONSTACK;
191	if ((ssa->ssa_flags & SVR4_SA_RESETHAND) != 0)
192		bsa->sa_flags |= SA_RESETHAND;
193	if ((ssa->ssa_flags & SVR4_SA_RESTART) != 0)
194		bsa->sa_flags |= SA_RESTART;
195	if ((ssa->ssa_flags & SVR4_SA_SIGINFO) != 0)
196		DPRINTF(("svr4_to_bsd_sigaction: SA_SIGINFO ignored\n"));
197	if ((ssa->ssa_flags & SVR4_SA_NOCLDSTOP) != 0)
198		bsa->sa_flags |= SA_NOCLDSTOP;
199	if ((ssa->ssa_flags & SVR4_SA_NODEFER) != 0)
200		bsa->sa_flags |= SA_NODEFER;
201	if ((ssa->ssa_flags & SVR4_SA_NOCLDWAIT) != 0)
202		bsa->sa_flags |= SA_NOCLDWAIT;
203	if ((ssa->ssa_flags & ~SVR4_SA_ALLBITS) != 0)
204		DPRINTF(("svr4_to_bsd_sigaction: extra bits ignored\n"));
205}
206
207void
208bsd_to_svr4_sigaction(bsa, ssa)
209	const struct sigaction *bsa;
210	struct svr4_sigaction *ssa;
211{
212
213	ssa->ssa_handler = (svr4_sig_t) bsa->sa_handler;
214	bsd_to_svr4_sigset(&bsa->sa_mask, &ssa->ssa_mask);
215	ssa->ssa_flags = 0;
216	if ((bsa->sa_flags & SA_ONSTACK) != 0)
217		ssa->ssa_flags |= SVR4_SA_ONSTACK;
218	if ((bsa->sa_flags & SA_RESETHAND) != 0)
219		ssa->ssa_flags |= SVR4_SA_RESETHAND;
220	if ((bsa->sa_flags & SA_RESTART) != 0)
221		ssa->ssa_flags |= SVR4_SA_RESTART;
222	if ((bsa->sa_flags & SA_NODEFER) != 0)
223		ssa->ssa_flags |= SVR4_SA_NODEFER;
224	if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
225		ssa->ssa_flags |= SVR4_SA_NOCLDSTOP;
226}
227
228void
229svr4_to_bsd_sigaltstack(sss, bss)
230	const struct svr4_sigaltstack *sss;
231	struct sigaltstack *bss;
232{
233
234	bss->ss_sp = sss->ss_sp;
235	bss->ss_size = sss->ss_size;
236	bss->ss_flags = 0;
237	if ((sss->ss_flags & SVR4_SS_DISABLE) != 0)
238		bss->ss_flags |= SS_DISABLE;
239	if ((sss->ss_flags & SVR4_SS_ONSTACK) != 0)
240		bss->ss_flags |= SS_ONSTACK;
241	if ((sss->ss_flags & ~SVR4_SS_ALLBITS) != 0)
242	  /*XXX*/ uprintf("svr4_to_bsd_sigaltstack: extra bits ignored\n");
243}
244
245void
246bsd_to_svr4_sigaltstack(bss, sss)
247	const struct sigaltstack *bss;
248	struct svr4_sigaltstack *sss;
249{
250
251	sss->ss_sp = bss->ss_sp;
252	sss->ss_size = bss->ss_size;
253	sss->ss_flags = 0;
254	if ((bss->ss_flags & SS_DISABLE) != 0)
255		sss->ss_flags |= SVR4_SS_DISABLE;
256	if ((bss->ss_flags & SS_ONSTACK) != 0)
257		sss->ss_flags |= SVR4_SS_ONSTACK;
258}
259
260int
261svr4_sys_sigaction(td, uap)
262	register struct thread *td;
263	struct svr4_sys_sigaction_args *uap;
264{
265	struct svr4_sigaction *nisa, *oisa, tmpisa;
266	struct sigaction *nbsa, *obsa, tmpbsa;
267	struct sigaction_args sa;
268	caddr_t sg;
269	int error;
270
271	DPRINTF(("@@@ svr4_sys_sigaction(%d, %d, %d)\n", td->td_proc->p_pid,
272			uap->signum,
273			SVR4_SVR42BSD_SIG(uap->signum)));
274
275	sg = stackgap_init();
276	nisa = uap->nsa;
277	oisa = uap->osa;
278
279	if (oisa != NULL)
280		obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
281	else
282		obsa = NULL;
283
284	if (nisa != NULL) {
285		nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
286		if ((error = copyin(nisa, &tmpisa, sizeof(tmpisa))) != 0)
287			return error;
288		svr4_to_bsd_sigaction(&tmpisa, &tmpbsa);
289		if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
290			return error;
291	} else
292		nbsa = NULL;
293
294#if defined(DEBUG_SVR4)
295	{
296		int i;
297		for (i = 0; i < 4; i++)
298			DPRINTF(("\tssa_mask[%d] = %lx\n", i,
299						nisa->ssa_mask.bits[i]));
300		DPRINTF(("\tssa_handler = %p\n", nisa->ssa_handler));
301	}
302#endif
303
304	sa.sig = SVR4_SVR42BSD_SIG(uap->signum);
305	sa.act = nbsa;
306	sa.oact = obsa;
307
308	if ((error = sigaction(td, &sa)) != 0)
309		return error;
310
311	if (oisa != NULL) {
312		if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
313			return error;
314		bsd_to_svr4_sigaction(&tmpbsa, &tmpisa);
315		if ((error = copyout(&tmpisa, oisa, sizeof(tmpisa))) != 0)
316			return error;
317	}
318
319	return 0;
320}
321
322int
323svr4_sys_sigaltstack(td, uap)
324	register struct thread *td;
325	struct svr4_sys_sigaltstack_args *uap;
326{
327	struct svr4_sigaltstack *nsss, *osss, tmpsss;
328	struct sigaltstack *nbss, *obss, tmpbss;
329	struct sigaltstack_args sa;
330	caddr_t sg;
331	int error, *retval;
332
333	retval = td->td_retval;
334	sg = stackgap_init();
335	nsss = uap->nss;
336	osss = uap->oss;
337
338	if (osss != NULL)
339		obss = stackgap_alloc(&sg, sizeof(struct sigaltstack));
340	else
341		obss = NULL;
342
343	if (nsss != NULL) {
344		nbss = stackgap_alloc(&sg, sizeof(struct sigaltstack));
345		if ((error = copyin(nsss, &tmpsss, sizeof(tmpsss))) != 0)
346			return error;
347		svr4_to_bsd_sigaltstack(&tmpsss, &tmpbss);
348		if ((error = copyout(&tmpbss, nbss, sizeof(tmpbss))) != 0)
349			return error;
350	} else
351		nbss = NULL;
352
353	sa.ss = nbss;
354	sa.oss = obss;
355
356	if ((error = sigaltstack(td, &sa)) != 0)
357		return error;
358
359	if (obss != NULL) {
360		if ((error = copyin(obss, &tmpbss, sizeof(tmpbss))) != 0)
361			return error;
362		bsd_to_svr4_sigaltstack(&tmpbss, &tmpsss);
363		if ((error = copyout(&tmpsss, osss, sizeof(tmpsss))) != 0)
364			return error;
365	}
366
367	return 0;
368}
369
370/*
371 * Stolen from the ibcs2 one
372 */
373int
374svr4_sys_signal(td, uap)
375	register struct thread *td;
376	struct svr4_sys_signal_args *uap;
377{
378	int signum;
379	int error, *retval = td->td_retval;
380	caddr_t sg = stackgap_init();
381
382	DPRINTF(("@@@ svr4_sys_signal(%d)\n", td->td_proc->p_pid));
383
384	signum = SVR4_SVR42BSD_SIG(SVR4_SIGNO(uap->signum));
385	if (signum <= 0 || signum > SVR4_NSIG)
386		return (EINVAL);
387
388	switch (SVR4_SIGCALL(uap->signum)) {
389	case SVR4_SIGDEFER_MASK:
390		if (uap->handler == SVR4_SIG_HOLD)
391			goto sighold;
392		/* FALLTHROUGH */
393
394	case SVR4_SIGNAL_MASK:
395		{
396			struct sigaction_args sa_args;
397			struct sigaction *nbsa, *obsa, sa;
398
399			nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
400			obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
401			sa_args.sig = signum;
402			sa_args.act = nbsa;
403			sa_args.oact = obsa;
404
405			sa.sa_handler = (sig_t) uap->handler;
406			SIGEMPTYSET(sa.sa_mask);
407			sa.sa_flags = 0;
408
409			if (signum != SIGALRM)
410				sa.sa_flags = SA_RESTART;
411
412			if ((error = copyout(&sa, nbsa, sizeof(sa))) != 0)
413				return error;
414			if ((error = sigaction(td, &sa_args)) != 0) {
415				DPRINTF(("signal: sigaction failed: %d\n",
416					 error));
417				*retval = (int)SVR4_SIG_ERR;
418				return error;
419			}
420			if ((error = copyin(obsa, &sa, sizeof(sa))) != 0)
421				return error;
422			*retval = (int)sa.sa_handler;
423			return 0;
424		}
425
426	case SVR4_SIGHOLD_MASK:
427sighold:
428		{
429			struct sigprocmask_args sa;
430			sigset_t *set;
431
432			set = stackgap_alloc(&sg, sizeof(sigset_t));
433			SIGEMPTYSET(*set);
434			SIGADDSET(*set, signum);
435			sa.how = SIG_BLOCK;
436			sa.set = set;
437			sa.oset = NULL;
438			return sigprocmask(td, &sa);
439		}
440
441	case SVR4_SIGRELSE_MASK:
442		{
443			struct sigprocmask_args sa;
444			sigset_t *set;
445
446			set = stackgap_alloc(&sg, sizeof(sigset_t));
447			SIGEMPTYSET(*set);
448			SIGADDSET(*set, signum);
449			sa.how = SIG_UNBLOCK;
450			sa.set = set;
451			sa.oset = NULL;
452			return sigprocmask(td, &sa);
453		}
454
455	case SVR4_SIGIGNORE_MASK:
456		{
457			struct sigaction_args sa_args;
458			struct sigaction *bsa, sa;
459
460			bsa = stackgap_alloc(&sg, sizeof(struct sigaction));
461			sa_args.sig = signum;
462			sa_args.act = bsa;
463			sa_args.oact = NULL;
464
465			sa.sa_handler = SIG_IGN;
466			SIGEMPTYSET(sa.sa_mask);
467			sa.sa_flags = 0;
468			if ((error = copyout(&sa, bsa, sizeof(sa))) != 0)
469				return error;
470			if ((error = sigaction(td, &sa_args)) != 0) {
471				DPRINTF(("sigignore: sigaction failed\n"));
472				return error;
473			}
474			return 0;
475		}
476
477	case SVR4_SIGPAUSE_MASK:
478		{
479			struct sigsuspend_args sa;
480			sigset_t *set;
481
482			set = stackgap_alloc(&sg, sizeof(sigset_t));
483			PROC_LOCK(td->td_proc);
484			*set = td->td_proc->p_sigmask;
485			PROC_UNLOCK(td->td_proc);
486			SIGDELSET(*set, signum);
487			sa.sigmask = set;
488			return sigsuspend(td, &sa);
489		}
490
491	default:
492		return (ENOSYS);
493	}
494}
495
496
497int
498svr4_sys_sigprocmask(td, uap)
499	struct thread *td;
500	struct svr4_sys_sigprocmask_args *uap;
501{
502	svr4_sigset_t sss;
503	sigset_t bss;
504	int error = 0, *retval;
505
506	retval = td->td_retval;
507	if (uap->oset != NULL) {
508		/* Fix the return value first if needed */
509		PROC_LOCK(td->td_proc);
510		bsd_to_svr4_sigset(&td->td_proc->p_sigmask, &sss);
511		PROC_UNLOCK(td->td_proc);
512		if ((error = copyout(&sss, uap->oset, sizeof(sss))) != 0)
513			return error;
514	}
515
516	if (uap->set == NULL)
517		/* Just examine */
518		return 0;
519
520	if ((error = copyin(uap->set, &sss, sizeof(sss))) != 0)
521		return error;
522
523	svr4_to_bsd_sigset(&sss, &bss);
524
525	PROC_LOCK(td->td_proc);
526	switch (uap->how) {
527	case SVR4_SIG_BLOCK:
528		SIGSETOR(td->td_proc->p_sigmask, bss);
529		SIG_CANTMASK(td->td_proc->p_sigmask);
530		break;
531
532	case SVR4_SIG_UNBLOCK:
533		SIGSETNAND(td->td_proc->p_sigmask, bss);
534		signotify(td->td_proc);
535		break;
536
537	case SVR4_SIG_SETMASK:
538		td->td_proc->p_sigmask = bss;
539		SIG_CANTMASK(td->td_proc->p_sigmask);
540		signotify(td->td_proc);
541		break;
542
543	default:
544		error = EINVAL;
545		break;
546	}
547	PROC_UNLOCK(td->td_proc);
548
549	return error;
550}
551
552int
553svr4_sys_sigpending(td, uap)
554	struct thread *td;
555	struct svr4_sys_sigpending_args *uap;
556{
557	sigset_t bss;
558	int *retval;
559	svr4_sigset_t sss;
560
561	DPRINTF(("@@@ svr4_sys_sigpending(%d)\n", td->td_proc->p_pid));
562	retval = td->td_retval;
563	switch (uap->what) {
564	case 1:	/* sigpending */
565		if (uap->mask == NULL)
566			return 0;
567		PROC_LOCK(td->td_proc);
568		bss = td->td_proc->p_siglist;
569		SIGSETAND(bss, td->td_proc->p_sigmask);
570		PROC_UNLOCK(td->td_proc);
571		bsd_to_svr4_sigset(&bss, &sss);
572		break;
573
574	case 2:	/* sigfillset */
575		svr4_sigfillset(&sss);
576#if defined(DEBUG_SVR4)
577		{
578			int i;
579			for (i = 0; i < 4; i++)
580				DPRINTF(("new sigset[%d] = %lx\n", i, (long)sss.bits[i]));
581		}
582#endif
583		break;
584
585	default:
586		return EINVAL;
587	}
588
589	return copyout(&sss, uap->mask, sizeof(sss));
590}
591
592int
593svr4_sys_sigsuspend(td, uap)
594	register struct thread *td;
595	struct svr4_sys_sigsuspend_args *uap;
596{
597	svr4_sigset_t sss;
598	sigset_t *bss;
599	struct sigsuspend_args sa;
600	int error;
601	caddr_t sg = stackgap_init();
602
603	if ((error = copyin(uap->ss, &sss, sizeof(sss))) != 0)
604		return error;
605
606	bss = stackgap_alloc(&sg, sizeof(sigset_t));
607	svr4_to_bsd_sigset(&sss, bss);
608
609	sa.sigmask = bss;
610	return sigsuspend(td, &sa);
611}
612
613
614int
615svr4_sys_kill(td, uap)
616	register struct thread *td;
617	struct svr4_sys_kill_args *uap;
618{
619	struct kill_args ka;
620
621	ka.pid = uap->pid;
622	ka.signum = SVR4_SVR42BSD_SIG(uap->signum);
623	return kill(td, &ka);
624}
625
626
627int
628svr4_sys_context(td, uap)
629	register struct thread *td;
630	struct svr4_sys_context_args *uap;
631{
632	struct svr4_ucontext uc;
633	int error;
634
635	switch (uap->func) {
636	case 0:
637		PROC_LOCK(td->td_proc);
638		DPRINTF(("getcontext(%p)\n", uap->uc));
639		svr4_getcontext(td, &uc, &td->td_proc->p_sigmask,
640		    sigonstack(cpu_getstack(td)));
641		PROC_UNLOCK(td->td_proc);
642		return copyout(&uc, uap->uc, sizeof(uc));
643
644	case 1:
645		DPRINTF(("setcontext(%p)\n", uap->uc));
646		if ((error = copyin(uap->uc, &uc, sizeof(uc))) != 0)
647			return error;
648		DPRINTF(("uc_flags = %lx\n", uc.uc_flags));
649#if defined(DEBUG_SVR4)
650		{
651			int i;
652			for (i = 0; i < 4; i++)
653				DPRINTF(("uc_sigmask[%d] = %lx\n", i,
654							uc.uc_sigmask.bits[i]));
655		}
656#endif
657		return svr4_setcontext(td, &uc);
658
659	default:
660		DPRINTF(("context(%d, %p)\n", uap->func,
661		    uap->uc));
662		return ENOSYS;
663	}
664	return 0;
665}
666
667int
668svr4_sys_pause(td, uap)
669	register struct thread *td;
670	struct svr4_sys_pause_args *uap;
671{
672	struct sigsuspend_args bsa;
673
674	bsa.sigmask = &td->td_proc->p_sigmask;
675	return sigsuspend(td, &bsa);
676}
677