xref: /netbsd-src/sys/compat/linux/common/linux_signal.c (revision 0df165c04d0a9ca1adde9ed2b890344c937954a6) 
1 /*	$NetBSD: linux_signal.c,v 1.55 2007/10/19 18:52:12 njoly Exp $	*/
2 
3 /*-
4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Frank van der Linden and Eric Haszlakiewicz.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. All advertising materials mentioning features or use of this software
19  *    must display the following acknowledgement:
20  *	This product includes software developed by the NetBSD
21  *	Foundation, Inc. and its contributors.
22  * 4. Neither the name of The NetBSD Foundation nor the names of its
23  *    contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36  * POSSIBILITY OF SUCH DAMAGE.
37  */
38 /*
39  * heavily from: svr4_signal.c,v 1.7 1995/01/09 01:04:21 christos Exp
40  */
41 
42 /*
43  *   Functions in multiarch:
44  *	linux_sys_signal	: linux_sig_notalpha.c
45  *	linux_sys_siggetmask	: linux_sig_notalpha.c
46  *	linux_sys_sigsetmask	: linux_sig_notalpha.c
47  *	linux_sys_pause		: linux_sig_notalpha.c
48  *	linux_sys_sigaction	: linux_sigaction.c
49  *
50  */
51 
52 /*
53  *   Unimplemented:
54  *	linux_sys_rt_sigtimedwait	: sigsuspend w/timeout.
55  */
56 
57 #include <sys/cdefs.h>
58 __KERNEL_RCSID(0, "$NetBSD: linux_signal.c,v 1.55 2007/10/19 18:52:12 njoly Exp $");
59 
60 #define COMPAT_LINUX 1
61 
62 #include <sys/param.h>
63 #include <sys/systm.h>
64 #include <sys/namei.h>
65 #include <sys/proc.h>
66 #include <sys/filedesc.h>
67 #include <sys/ioctl.h>
68 #include <sys/mount.h>
69 #include <sys/kernel.h>
70 #include <sys/signal.h>
71 #include <sys/signalvar.h>
72 #include <sys/malloc.h>
73 
74 #include <sys/syscallargs.h>
75 
76 #include <compat/linux/common/linux_types.h>
77 #include <compat/linux/common/linux_signal.h>
78 #include <compat/linux/common/linux_exec.h> /* For emul_linux */
79 #include <compat/linux/common/linux_machdep.h> /* For LINUX_NPTL */
80 #include <compat/linux/common/linux_emuldata.h> /* for linux_emuldata */
81 #include <compat/linux/common/linux_siginfo.h>
82 #include <compat/linux/common/linux_sigevent.h>
83 #include <compat/linux/common/linux_util.h>
84 #include <compat/linux/common/linux_ipc.h>
85 #include <compat/linux/common/linux_sem.h>
86 
87 #include <compat/linux/linux_syscallargs.h>
88 
89 /* Locally used defines (in bsd<->linux conversion functions): */
90 #define	linux_sigemptyset(s)	memset((s), 0, sizeof(*(s)))
91 #define	linux_sigismember(s, n)	((s)->sig[((n) - 1) / LINUX__NSIG_BPW]	\
92 					& (1 << ((n) - 1) % LINUX__NSIG_BPW))
93 #define	linux_sigaddset(s, n)	((s)->sig[((n) - 1) / LINUX__NSIG_BPW]	\
94 					|= (1 << ((n) - 1) % LINUX__NSIG_BPW))
95 
96 #ifdef DEBUG_LINUX
97 #define DPRINTF(a)	uprintf a
98 #else
99 #define DPRINTF(a)
100 #endif
101 
102 extern const int native_to_linux_signo[];
103 extern const int linux_to_native_signo[];
104 
105 /*
106  * Convert between Linux and BSD signal sets.
107  */
108 #if LINUX__NSIG_WORDS > 1
109 void
110 linux_old_extra_to_native_sigset(bss, lss, extra)
111 	sigset_t *bss;
112 	const linux_old_sigset_t *lss;
113 	const unsigned long *extra;
114 {
115 	linux_sigset_t lsnew;
116 
117 	/* convert old sigset to new sigset */
118 	linux_sigemptyset(&lsnew);
119 	lsnew.sig[0] = *lss;
120 	if (extra)
121 		memcpy(&lsnew.sig[1], extra,
122 		    sizeof(linux_sigset_t) - sizeof(linux_old_sigset_t));
123 
124 	linux_to_native_sigset(bss, &lsnew);
125 }
126 
127 void
128 native_to_linux_old_extra_sigset(lss, extra, bss)
129 	linux_old_sigset_t *lss;
130 	unsigned long *extra;
131 	const sigset_t *bss;
132 {
133 	linux_sigset_t lsnew;
134 
135 	native_to_linux_sigset(&lsnew, bss);
136 
137 	/* convert new sigset to old sigset */
138 	*lss = lsnew.sig[0];
139 	if (extra)
140 		memcpy(extra, &lsnew.sig[1],
141 		    sizeof(linux_sigset_t) - sizeof(linux_old_sigset_t));
142 }
143 #endif /* LINUX__NSIG_WORDS > 1 */
144 
145 void
146 linux_to_native_sigset(bss, lss)
147 	sigset_t *bss;
148 	const linux_sigset_t *lss;
149 {
150 	int i, newsig;
151 
152 	sigemptyset(bss);
153 	for (i = 1; i < LINUX__NSIG; i++) {
154 		if (linux_sigismember(lss, i)) {
155 			newsig = linux_to_native_signo[i];
156 			if (newsig)
157 				sigaddset(bss, newsig);
158 		}
159 	}
160 }
161 
162 void
163 native_to_linux_sigset(lss, bss)
164 	linux_sigset_t *lss;
165 	const sigset_t *bss;
166 {
167 	int i, newsig;
168 
169 	linux_sigemptyset(lss);
170 	for (i = 1; i < NSIG; i++) {
171 		if (sigismember(bss, i)) {
172 			newsig = native_to_linux_signo[i];
173 			if (newsig)
174 				linux_sigaddset(lss, newsig);
175 		}
176 	}
177 }
178 
179 unsigned int
180 native_to_linux_sigflags(bsf)
181 	const int bsf;
182 {
183 	unsigned int lsf = 0;
184 	if ((bsf & SA_NOCLDSTOP) != 0)
185 		lsf |= LINUX_SA_NOCLDSTOP;
186 	if ((bsf & SA_NOCLDWAIT) != 0)
187 		lsf |= LINUX_SA_NOCLDWAIT;
188 	if ((bsf & SA_ONSTACK) != 0)
189 		lsf |= LINUX_SA_ONSTACK;
190 	if ((bsf & SA_RESTART) != 0)
191 		lsf |= LINUX_SA_RESTART;
192 	if ((bsf & SA_NODEFER) != 0)
193 		lsf |= LINUX_SA_NOMASK;
194 	if ((bsf & SA_RESETHAND) != 0)
195 		lsf |= LINUX_SA_ONESHOT;
196 	if ((bsf & SA_SIGINFO) != 0)
197 		lsf |= LINUX_SA_SIGINFO;
198 	return lsf;
199 }
200 
201 int
202 linux_to_native_sigflags(lsf)
203 	const unsigned long lsf;
204 {
205 	int bsf = 0;
206 	if ((lsf & LINUX_SA_NOCLDSTOP) != 0)
207 		bsf |= SA_NOCLDSTOP;
208 	if ((lsf & LINUX_SA_NOCLDWAIT) != 0)
209 		bsf |= SA_NOCLDWAIT;
210 	if ((lsf & LINUX_SA_ONSTACK) != 0)
211 		bsf |= SA_ONSTACK;
212 	if ((lsf & LINUX_SA_RESTART) != 0)
213 		bsf |= SA_RESTART;
214 	if ((lsf & LINUX_SA_ONESHOT) != 0)
215 		bsf |= SA_RESETHAND;
216 	if ((lsf & LINUX_SA_NOMASK) != 0)
217 		bsf |= SA_NODEFER;
218 	if ((lsf & LINUX_SA_SIGINFO) != 0)
219 		bsf |= SA_SIGINFO;
220 	if ((lsf & ~LINUX_SA_ALLBITS) != 0) {
221 		DPRINTF(("linux_old_to_native_sigflags: "
222 		    "%lx extra bits ignored\n", lsf));
223 	}
224 	return bsf;
225 }
226 
227 /*
228  * Convert between Linux and BSD sigaction structures.
229  */
230 void
231 linux_old_to_native_sigaction(bsa, lsa)
232 	struct sigaction *bsa;
233 	const struct linux_old_sigaction *lsa;
234 {
235 	bsa->sa_handler = lsa->linux_sa_handler;
236 	linux_old_to_native_sigset(&bsa->sa_mask, &lsa->linux_sa_mask);
237 	bsa->sa_flags = linux_to_native_sigflags(lsa->linux_sa_flags);
238 }
239 
240 void
241 native_to_linux_old_sigaction(lsa, bsa)
242 	struct linux_old_sigaction *lsa;
243 	const struct sigaction *bsa;
244 {
245 	lsa->linux_sa_handler = bsa->sa_handler;
246 	native_to_linux_old_sigset(&lsa->linux_sa_mask, &bsa->sa_mask);
247 	lsa->linux_sa_flags = native_to_linux_sigflags(bsa->sa_flags);
248 #ifndef __alpha__
249 	lsa->linux_sa_restorer = NULL;
250 #endif
251 }
252 
253 /* ...and the new sigaction conversion funcs. */
254 void
255 linux_to_native_sigaction(bsa, lsa)
256 	struct sigaction *bsa;
257 	const struct linux_sigaction *lsa;
258 {
259 	bsa->sa_handler = lsa->linux_sa_handler;
260 	linux_to_native_sigset(&bsa->sa_mask, &lsa->linux_sa_mask);
261 	bsa->sa_flags = linux_to_native_sigflags(lsa->linux_sa_flags);
262 }
263 
264 void
265 native_to_linux_sigaction(lsa, bsa)
266 	struct linux_sigaction *lsa;
267 	const struct sigaction *bsa;
268 {
269 	lsa->linux_sa_handler = bsa->sa_handler;
270 	native_to_linux_sigset(&lsa->linux_sa_mask, &bsa->sa_mask);
271 	lsa->linux_sa_flags = native_to_linux_sigflags(bsa->sa_flags);
272 #ifndef __alpha__
273 	lsa->linux_sa_restorer = NULL;
274 #endif
275 }
276 
277 /* ----------------------------------------------------------------------- */
278 
279 /*
280  * The Linux sigaction() system call. Do the usual conversions,
281  * and just call sigaction(). Some flags and values are silently
282  * ignored (see above).
283  */
284 int
285 linux_sys_rt_sigaction(struct lwp *l, void *v, register_t *retval)
286 {
287 	struct linux_sys_rt_sigaction_args /* {
288 		syscallarg(int) signum;
289 		syscallarg(const struct linux_sigaction *) nsa;
290 		syscallarg(struct linux_sigaction *) osa;
291 		syscallarg(size_t) sigsetsize;
292 	} */ *uap = v;
293 	struct linux_sigaction nlsa, olsa;
294 	struct sigaction nbsa, obsa;
295 	int error, sig;
296 	void *tramp = NULL;
297 	int vers = 0;
298 #if defined __amd64__
299 	struct sigacts *ps = l->l_proc->p_sigacts;
300 #endif
301 
302 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
303 		return (EINVAL);
304 
305 	if (SCARG(uap, nsa)) {
306 		error = copyin(SCARG(uap, nsa), &nlsa, sizeof(nlsa));
307 		if (error)
308 			return (error);
309 		linux_to_native_sigaction(&nbsa, &nlsa);
310 	}
311 
312 	sig = SCARG(uap, signum);
313 	if (sig < 0 || sig >= LINUX__NSIG)
314 		return (EINVAL);
315 	if (sig > 0 && !linux_to_native_signo[sig]) {
316 		/* Pretend that we did something useful for unknown signals. */
317 		obsa.sa_handler = SIG_IGN;
318 		sigemptyset(&obsa.sa_mask);
319 		obsa.sa_flags = 0;
320 	} else {
321 #if defined __amd64__
322 		if (nlsa.linux_sa_flags & LINUX_SA_RESTORER) {
323 			if ((tramp = nlsa.linux_sa_restorer) != NULL)
324 				vers = 2; /* XXX arch dependant */
325 		}
326 #endif
327 
328 		error = sigaction1(l, linux_to_native_signo[sig],
329 		    SCARG(uap, nsa) ? &nbsa : NULL,
330 		    SCARG(uap, osa) ? &obsa : NULL,
331 		    tramp, vers);
332 		if (error)
333 			return (error);
334 	}
335 	if (SCARG(uap, osa)) {
336 		native_to_linux_sigaction(&olsa, &obsa);
337 
338 #if defined __amd64__
339 		if (ps->sa_sigdesc[sig].sd_vers != 0) {
340 			olsa.linux_sa_restorer = ps->sa_sigdesc[sig].sd_tramp;
341 			olsa.linux_sa_flags |= LINUX_SA_RESTORER;
342 		}
343 #endif
344 
345 		error = copyout(&olsa, SCARG(uap, osa), sizeof(olsa));
346 		if (error)
347 			return (error);
348 	}
349 	return (0);
350 }
351 
352 int
353 linux_sigprocmask1(l, how, set, oset)
354 	struct lwp *l;
355 	int how;
356 	const linux_old_sigset_t *set;
357 	linux_old_sigset_t *oset;
358 {
359 	struct proc *p = l->l_proc;
360 	linux_old_sigset_t nlss, olss;
361 	sigset_t nbss, obss;
362 	int error;
363 
364 	switch (how) {
365 	case LINUX_SIG_BLOCK:
366 		how = SIG_BLOCK;
367 		break;
368 	case LINUX_SIG_UNBLOCK:
369 		how = SIG_UNBLOCK;
370 		break;
371 	case LINUX_SIG_SETMASK:
372 		how = SIG_SETMASK;
373 		break;
374 	default:
375 		return (EINVAL);
376 	}
377 
378 	if (set) {
379 		error = copyin(set, &nlss, sizeof(nlss));
380 		if (error)
381 			return (error);
382 		linux_old_to_native_sigset(&nbss, &nlss);
383 	}
384 	mutex_enter(&p->p_smutex);
385 	error = sigprocmask1(l, how,
386 	    set ? &nbss : NULL, oset ? &obss : NULL);
387 	mutex_exit(&p->p_smutex);
388 	if (error)
389 		return (error);
390 	if (oset) {
391 		native_to_linux_old_sigset(&olss, &obss);
392 		error = copyout(&olss, oset, sizeof(olss));
393 		if (error)
394 			return (error);
395 	}
396 	return (error);
397 }
398 
399 int
400 linux_sys_rt_sigprocmask(struct lwp *l, void *v, register_t *retval)
401 {
402 	struct linux_sys_rt_sigprocmask_args /* {
403 		syscallarg(int) how;
404 		syscallarg(const linux_sigset_t *) set;
405 		syscallarg(linux_sigset_t *) oset;
406 		syscallarg(size_t) sigsetsize;
407 	} */ *uap = v;
408 	linux_sigset_t nlss, olss, *oset;
409 	const linux_sigset_t *set;
410 	struct proc *p = l->l_proc;
411 	sigset_t nbss, obss;
412 	int error, how;
413 
414 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
415 		return (EINVAL);
416 
417 	switch (SCARG(uap, how)) {
418 	case LINUX_SIG_BLOCK:
419 		how = SIG_BLOCK;
420 		break;
421 	case LINUX_SIG_UNBLOCK:
422 		how = SIG_UNBLOCK;
423 		break;
424 	case LINUX_SIG_SETMASK:
425 		how = SIG_SETMASK;
426 		break;
427 	default:
428 		return (EINVAL);
429 	}
430 
431 	set = SCARG(uap, set);
432 	oset = SCARG(uap, oset);
433 
434 	if (set) {
435 		error = copyin(set, &nlss, sizeof(nlss));
436 		if (error)
437 			return (error);
438 		linux_to_native_sigset(&nbss, &nlss);
439 	}
440 	mutex_enter(&p->p_smutex);
441 	error = sigprocmask1(l, how,
442 	    set ? &nbss : NULL, oset ? &obss : NULL);
443 	mutex_exit(&p->p_smutex);
444 	if (!error && oset) {
445 		native_to_linux_sigset(&olss, &obss);
446 		error = copyout(&olss, oset, sizeof(olss));
447 	}
448 	return (error);
449 }
450 
451 int
452 linux_sys_rt_sigpending(struct lwp *l, void *v, register_t *retval)
453 {
454 	struct linux_sys_rt_sigpending_args /* {
455 		syscallarg(linux_sigset_t *) set;
456 		syscallarg(size_t) sigsetsize;
457 	} */ *uap = v;
458 	sigset_t bss;
459 	linux_sigset_t lss;
460 
461 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
462 		return (EINVAL);
463 
464 	sigpending1(l, &bss);
465 	native_to_linux_sigset(&lss, &bss);
466 	return copyout(&lss, SCARG(uap, set), sizeof(lss));
467 }
468 
469 #ifndef __amd64__
470 int
471 linux_sys_sigpending(struct lwp *l, void *v, register_t *retval)
472 {
473 	struct linux_sys_sigpending_args /* {
474 		syscallarg(linux_old_sigset_t *) mask;
475 	} */ *uap = v;
476 	sigset_t bss;
477 	linux_old_sigset_t lss;
478 
479 	sigpending1(l, &bss);
480 	native_to_linux_old_sigset(&lss, &bss);
481 	return copyout(&lss, SCARG(uap, set), sizeof(lss));
482 }
483 
484 int
485 linux_sys_sigsuspend(struct lwp *l, void *v, register_t *retval)
486 {
487 	struct linux_sys_sigsuspend_args /* {
488 		syscallarg(void *) restart;
489 		syscallarg(int) oldmask;
490 		syscallarg(int) mask;
491 	} */ *uap = v;
492 	linux_old_sigset_t lss;
493 	sigset_t bss;
494 
495 	lss = SCARG(uap, mask);
496 	linux_old_to_native_sigset(&bss, &lss);
497 	return (sigsuspend1(l, &bss));
498 }
499 #endif /* __amd64__ */
500 
501 int
502 linux_sys_rt_sigsuspend(struct lwp *l, void *v, register_t *retval)
503 {
504 	struct linux_sys_rt_sigsuspend_args /* {
505 		syscallarg(linux_sigset_t *) unewset;
506 		syscallarg(size_t) sigsetsize;
507 	} */ *uap = v;
508 	linux_sigset_t lss;
509 	sigset_t bss;
510 	int error;
511 
512 	if (SCARG(uap, sigsetsize) != sizeof(linux_sigset_t))
513 		return (EINVAL);
514 
515 	error = copyin(SCARG(uap, unewset), &lss, sizeof(linux_sigset_t));
516 	if (error)
517 		return (error);
518 
519 	linux_to_native_sigset(&bss, &lss);
520 
521 	return (sigsuspend1(l, &bss));
522 }
523 
524 /*
525  * Once more: only a signal conversion is needed.
526  * Note: also used as sys_rt_queueinfo.  The info field is ignored.
527  */
528 int
529 linux_sys_rt_queueinfo(l, v, retval)
530 	struct lwp *l;
531 	void *v;
532 	register_t *retval;
533 {
534 	/* XXX XAX This isn't this really int, int, siginfo_t *, is it? */
535 #if 0
536 	struct linux_sys_rt_queueinfo_args /* {
537 		syscallarg(int) pid;
538 		syscallarg(int) signum;
539 		syscallarg(siginfo_t *) uinfo;
540 	} */ *uap = v;
541 #endif
542 
543 	/* XXX To really implement this we need to	*/
544 	/* XXX keep a list of queued signals somewhere.	*/
545 	return (linux_sys_kill(l, v, retval));
546 }
547 
548 int
549 linux_sys_kill(l, v, retval)
550 	struct lwp *l;
551 	void *v;
552 	register_t *retval;
553 {
554 	struct linux_sys_kill_args /* {
555 		syscallarg(int) pid;
556 		syscallarg(int) signum;
557 	} */ *uap = v;
558 
559 	struct sys_kill_args ka;
560 	int sig;
561 
562 	SCARG(&ka, pid) = SCARG(uap, pid);
563 	sig = SCARG(uap, signum);
564 	if (sig < 0 || sig >= LINUX__NSIG)
565 		return (EINVAL);
566 	SCARG(&ka, signum) = linux_to_native_signo[sig];
567 	return sys_kill(l, &ka, retval);
568 }
569 
570 #ifdef LINUX_SS_ONSTACK
571 static void linux_to_native_sigaltstack __P((struct sigaltstack *,
572     const struct linux_sigaltstack *));
573 
574 static void
575 linux_to_native_sigaltstack(bss, lss)
576 	struct sigaltstack *bss;
577 	const struct linux_sigaltstack *lss;
578 {
579 	bss->ss_sp = lss->ss_sp;
580 	bss->ss_size = lss->ss_size;
581 	if (lss->ss_flags & LINUX_SS_ONSTACK)
582 	    bss->ss_flags = SS_ONSTACK;
583 	else if (lss->ss_flags & LINUX_SS_DISABLE)
584 	    bss->ss_flags = SS_DISABLE;
585 	else
586 	    bss->ss_flags = 0;
587 }
588 
589 void
590 native_to_linux_sigaltstack(lss, bss)
591 	struct linux_sigaltstack *lss;
592 	const struct sigaltstack *bss;
593 {
594 	lss->ss_sp = bss->ss_sp;
595 	lss->ss_size = bss->ss_size;
596 	if (bss->ss_flags & SS_ONSTACK)
597 	    lss->ss_flags = LINUX_SS_ONSTACK;
598 	else if (bss->ss_flags & SS_DISABLE)
599 	    lss->ss_flags = LINUX_SS_DISABLE;
600 	else
601 	    lss->ss_flags = 0;
602 }
603 
604 int
605 linux_sys_sigaltstack(struct lwp *l, void *v, register_t *retval)
606 {
607 	struct linux_sys_sigaltstack_args /* {
608 		syscallarg(const struct linux_sigaltstack *) ss;
609 		syscallarg(struct linux_sigaltstack *) oss;
610 	} */ *uap = v;
611 	struct linux_sigaltstack ss;
612 	struct sigaltstack nss;
613 	struct proc *p = l->l_proc;
614 	int error = 0;
615 
616 	if (SCARG(uap, oss)) {
617 		native_to_linux_sigaltstack(&ss, &l->l_sigstk);
618 		if ((error = copyout(&ss, SCARG(uap, oss), sizeof(ss))) != 0)
619 			return error;
620 	}
621 
622 	if (SCARG(uap, ss) != NULL) {
623 		if ((error = copyin(SCARG(uap, ss), &ss, sizeof(ss))) != 0)
624 			return error;
625 		linux_to_native_sigaltstack(&nss, &ss);
626 
627 		mutex_enter(&p->p_smutex);
628 
629 		if (nss.ss_flags & ~SS_ALLBITS)
630 			error = EINVAL;
631 		else if (nss.ss_flags & SS_DISABLE) {
632 			if (l->l_sigstk.ss_flags & SS_ONSTACK)
633 				error = EINVAL;
634 		} else if (nss.ss_size < LINUX_MINSIGSTKSZ)
635 			error = ENOMEM;
636 
637 		if (error == 0)
638 			l->l_sigstk = nss;
639 
640 		mutex_exit(&p->p_smutex);
641 	}
642 
643 	return error;
644 }
645 #endif /* LINUX_SS_ONSTACK */
646 
647 #ifdef LINUX_NPTL
648 int
649 linux_sys_tkill(l, v, retval)
650 	struct lwp *l;
651 	void *v;
652 	register_t *retval;
653 {
654 	struct linux_sys_tkill_args /* {
655 		syscallarg(int) tid;
656 		syscallarg(int) sig;
657 	} */ *uap = v;
658 	struct linux_sys_kill_args cup;
659 
660 	/* We use the PID as the TID ... */
661 	SCARG(&cup, pid) = SCARG(uap, tid);
662 	SCARG(&cup, signum) = SCARG(uap, sig);
663 
664 	return linux_sys_kill(l, &cup, retval);
665 }
666 
667 int
668 linux_sys_tgkill(l, v, retval)
669 	struct lwp *l;
670 	void *v;
671 	register_t *retval;
672 {
673 	struct linux_sys_tgkill_args /* {
674 		syscallarg(int) tgid;
675 		syscallarg(int) tid;
676 		syscallarg(int) sig;
677 	} */ *uap = v;
678 	struct linux_sys_kill_args cup;
679 	struct linux_emuldata *led;
680 	struct proc *p;
681 
682 	SCARG(&cup, pid) = SCARG(uap, tid);
683 	SCARG(&cup, signum) = SCARG(uap, sig);
684 
685 	if (SCARG(uap, tgid) == -1)
686 		return linux_sys_kill(l, &cup, retval);
687 
688 	/* We use the PID as the TID, but make sure the group ID is right */
689 	if ((p = pfind(SCARG(uap, tid))) == NULL)
690 		return ESRCH;
691 
692 	if (p->p_emul != &emul_linux)
693 		return ESRCH;
694 
695 	led = p->p_emuldata;
696 
697 	if (led->s->group_pid != SCARG(uap, tgid))
698 		return ESRCH;
699 
700 	return linux_sys_kill(l, &cup, retval);
701 }
702 #endif /* LINUX_NPTL */
703