ibcs2_signal.c revision 50477 
1/*
2 * Copyright (c) 1995 Scott Bartram
3 * Copyright (c) 1995 Steven Wallace
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/i386/ibcs2/ibcs2_signal.c 50477 1999-08-28 01:08:13Z peter $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/signalvar.h>
34#include <sys/sysproto.h>
35
36#include <i386/ibcs2/ibcs2_types.h>
37#include <i386/ibcs2/ibcs2_signal.h>
38#include <i386/ibcs2/ibcs2_proto.h>
39#include <i386/ibcs2/ibcs2_xenix.h>
40#include <i386/ibcs2/ibcs2_util.h>
41
42#define sigemptyset(s)		bzero((s), sizeof(*(s)))
43#define sigismember(s, n)	(*(s) & sigmask(n))
44#define sigaddset(s, n)		(*(s) |= sigmask(n))
45
46#define	ibcs2_sigmask(n)	(1 << ((n) - 1))
47#define ibcs2_sigemptyset(s)	bzero((s), sizeof(*(s)))
48#define ibcs2_sigismember(s, n)	(*(s) & ibcs2_sigmask(n))
49#define ibcs2_sigaddset(s, n)	(*(s) |= ibcs2_sigmask(n))
50
51static void ibcs2_to_bsd_sigset    __P((const ibcs2_sigset_t *, sigset_t *));
52static void bsd_to_ibcs2_sigset    __P((const sigset_t *, ibcs2_sigset_t *));
53static void ibcs2_to_bsd_sigaction __P((struct ibcs2_sigaction *,
54					struct sigaction *));
55static void bsd_to_ibcs2_sigaction __P((struct sigaction *,
56					struct ibcs2_sigaction *));
57
58int bsd_to_ibcs2_sig[] = {
59	0,			/* 0 */
60	IBCS2_SIGHUP,		/* 1 */
61	IBCS2_SIGINT,		/* 2 */
62	IBCS2_SIGQUIT,		/* 3 */
63	IBCS2_SIGILL,		/* 4 */
64	IBCS2_SIGTRAP,		/* 5 */
65	IBCS2_SIGABRT,		/* 6 */
66	IBCS2_SIGEMT,		/* 7 */
67	IBCS2_SIGFPE,		/* 8 */
68	IBCS2_SIGKILL,		/* 9 */
69	IBCS2_SIGBUS,		/* 10 */
70	IBCS2_SIGSEGV,		/* 11 */
71	IBCS2_SIGSYS,		/* 12 */
72	IBCS2_SIGPIPE,		/* 13 */
73	IBCS2_SIGALRM,		/* 14 */
74	IBCS2_SIGTERM,		/* 15 */
75	0,			/* 16 - SIGURG */
76	IBCS2_SIGSTOP,		/* 17 */
77	IBCS2_SIGTSTP,		/* 18 */
78	IBCS2_SIGCONT,		/* 19 */
79	IBCS2_SIGCLD,		/* 20 */
80	IBCS2_SIGTTIN,		/* 21 */
81	IBCS2_SIGTTOU,		/* 22 */
82	IBCS2_SIGPOLL,		/* 23 */
83	0,			/* 24 - SIGXCPU */
84	0,			/* 25 - SIGXFSZ */
85	IBCS2_SIGVTALRM,	/* 26 */
86	IBCS2_SIGPROF,		/* 27 */
87	IBCS2_SIGWINCH,		/* 28 */
88	0,			/* 29 */
89	IBCS2_SIGUSR1,		/* 30 */
90	IBCS2_SIGUSR2,		/* 31 */
91};
92
93static int ibcs2_to_bsd_sig[] = {
94	0,			/* 0 */
95	SIGHUP,			/* 1 */
96	SIGINT,			/* 2 */
97	SIGQUIT,		/* 3 */
98	SIGILL,			/* 4 */
99	SIGTRAP,		/* 5 */
100	SIGABRT,		/* 6 */
101	SIGEMT,			/* 7 */
102	SIGFPE,			/* 8 */
103	SIGKILL,		/* 9 */
104	SIGBUS,			/* 10 */
105	SIGSEGV,		/* 11 */
106	SIGSYS,			/* 12 */
107	SIGPIPE,		/* 13 */
108	SIGALRM,		/* 14 */
109	SIGTERM,		/* 15 */
110	SIGUSR1,		/* 16 */
111	SIGUSR2,		/* 17 */
112	SIGCHLD,		/* 18 */
113	0,			/* 19 - SIGPWR */
114	SIGWINCH,		/* 20 */
115	0,			/* 21 */
116	SIGIO,			/* 22 */
117	SIGSTOP,		/* 23 */
118	SIGTSTP,		/* 24 */
119	SIGCONT,		/* 25 */
120	SIGTTIN,		/* 26 */
121	SIGTTOU,		/* 27 */
122	SIGVTALRM,		/* 28 */
123	SIGPROF,		/* 29 */
124	0,			/* 30 */
125	0,			/* 31 */
126};
127
128void
129ibcs2_to_bsd_sigset(iss, bss)
130	const ibcs2_sigset_t *iss;
131	sigset_t *bss;
132{
133	int i, newsig;
134
135	sigemptyset(bss);
136	for (i = 1; i < IBCS2_NSIG; i++) {
137		if (ibcs2_sigismember(iss, i)) {
138			newsig = ibcs2_to_bsd_sig[i];
139			if (newsig)
140				sigaddset(bss, newsig);
141		}
142	}
143}
144
145static void
146bsd_to_ibcs2_sigset(bss, iss)
147	const sigset_t *bss;
148	ibcs2_sigset_t *iss;
149{
150	int i, newsig;
151
152	ibcs2_sigemptyset(iss);
153	for (i = 1; i < NSIG; i++) {
154		if (sigismember(bss, i)) {
155			newsig = bsd_to_ibcs2_sig[i];
156			if (newsig)
157				ibcs2_sigaddset(iss, newsig);
158		}
159	}
160}
161
162static void
163ibcs2_to_bsd_sigaction(isa, bsa)
164	struct ibcs2_sigaction *isa;
165	struct sigaction *bsa;
166{
167
168	bsa->sa_handler = isa->isa_handler;
169	ibcs2_to_bsd_sigset(&isa->isa_mask, &bsa->sa_mask);
170	bsa->sa_flags = 0;	/* ??? SA_NODEFER */
171	if ((isa->isa_flags & IBCS2_SA_NOCLDSTOP) != 0)
172		bsa->sa_flags |= SA_NOCLDSTOP;
173}
174
175static void
176bsd_to_ibcs2_sigaction(bsa, isa)
177	struct sigaction *bsa;
178	struct ibcs2_sigaction *isa;
179{
180
181	isa->isa_handler = bsa->sa_handler;
182	bsd_to_ibcs2_sigset(&bsa->sa_mask, &isa->isa_mask);
183	isa->isa_flags = 0;
184	if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
185		isa->isa_flags |= IBCS2_SA_NOCLDSTOP;
186}
187
188int
189ibcs2_sigaction(p, uap)
190	register struct proc *p;
191	struct ibcs2_sigaction_args *uap;
192{
193	struct ibcs2_sigaction *nisa, *oisa, tmpisa;
194	struct sigaction *nbsa, *obsa, tmpbsa;
195	struct sigaction_args sa;
196	caddr_t sg;
197	int error;
198
199	sg = stackgap_init();
200	nisa = SCARG(uap, act);
201	oisa = SCARG(uap, oact);
202
203	if (oisa != NULL)
204		obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
205	else
206		obsa = NULL;
207
208	if (nisa != NULL) {
209		nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
210		if ((error = copyin(nisa, &tmpisa, sizeof(tmpisa))) != 0)
211			return error;
212		ibcs2_to_bsd_sigaction(&tmpisa, &tmpbsa);
213		if ((error = copyout(&tmpbsa, nbsa, sizeof(tmpbsa))) != 0)
214			return error;
215	} else
216		nbsa = NULL;
217
218	SCARG(&sa, signum) = ibcs2_to_bsd_sig[SCARG(uap, sig)];
219	SCARG(&sa, nsa) = nbsa;
220	SCARG(&sa, osa) = obsa;
221
222	if ((error = sigaction(p, &sa)) != 0)
223		return error;
224
225	if (oisa != NULL) {
226		if ((error = copyin(obsa, &tmpbsa, sizeof(tmpbsa))) != 0)
227			return error;
228		bsd_to_ibcs2_sigaction(&tmpbsa, &tmpisa);
229		if ((error = copyout(&tmpisa, oisa, sizeof(tmpisa))) != 0)
230			return error;
231	}
232
233	return 0;
234}
235
236int
237ibcs2_sigsys(p, uap)
238	register struct proc *p;
239	struct ibcs2_sigsys_args *uap;
240{
241	struct sigaction sa;
242	int signum = ibcs2_to_bsd_sig[IBCS2_SIGNO(SCARG(uap, sig))];
243	int error;
244	caddr_t sg = stackgap_init();
245
246	if (signum <= 0 || signum >= IBCS2_NSIG) {
247		if (IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGNAL_MASK ||
248		    IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGSET_MASK)
249			p->p_retval[0] = (int)IBCS2_SIG_ERR;
250		return EINVAL;
251	}
252
253	switch (IBCS2_SIGCALL(SCARG(uap, sig))) {
254	case IBCS2_SIGSET_MASK:
255		/*
256		 * Check for SIG_HOLD action.
257		 * Otherwise, perform signal() except with different sa_flags.
258		 */
259		if (SCARG(uap, fp) != IBCS2_SIG_HOLD) {
260			/* add sig to mask before exececuting signal handler */
261			sa.sa_flags = 0;
262			goto ibcs2_sigset;
263		}
264		/* else fallthrough to sighold */
265
266	case IBCS2_SIGHOLD_MASK:
267		{
268			struct sigprocmask_args sa;
269
270			SCARG(&sa, how) = SIG_BLOCK;
271			SCARG(&sa, mask) = sigmask(signum);
272			return sigprocmask(p, &sa);
273		}
274
275	case IBCS2_SIGNAL_MASK:
276		{
277			struct sigaction_args sa_args;
278			struct sigaction *nbsa, *obsa;
279
280			/* do not automatically block signal */
281			sa.sa_flags = SA_NODEFER;
282#ifdef SA_RESETHAND
283			if((signum != IBCS2_SIGILL) &&
284			   (signum != IBCS2_SIGTRAP) &&
285			   (signum != IBCS2_SIGPWR))
286				/* set to SIG_DFL before executing handler */
287				sa.sa_flags |= SA_RESETHAND;
288#endif
289		ibcs2_sigset:
290			nbsa = stackgap_alloc(&sg, sizeof(struct sigaction));
291			obsa = stackgap_alloc(&sg, sizeof(struct sigaction));
292			SCARG(&sa_args, signum) = signum;
293			SCARG(&sa_args, nsa) = nbsa;
294			SCARG(&sa_args, osa) = obsa;
295
296			sa.sa_handler = SCARG(uap, fp);
297			sigemptyset(&sa.sa_mask);
298#if 0
299			if (signum != SIGALRM)
300				sa.sa_flags |= SA_RESTART;
301#endif
302			p->p_retval[0] = (int)IBCS2_SIG_ERR; /* init error return */
303
304			/* perform native sigaction() */
305			if ((error = copyout(&sa, nbsa, sizeof(sa))) != 0)
306				return error;
307			if ((error = sigaction(p, &sa_args)) != 0) {
308				DPRINTF(("signal: sigaction failed: %d\n",
309					 error));
310				return error;
311			}
312			if ((error = copyin(obsa, &sa, sizeof(sa))) != 0)
313				return error;
314			p->p_retval[0] = (int)sa.sa_handler;
315
316			/* special sigset() check */
317                        if(IBCS2_SIGCALL(SCARG(uap, sig)) == IBCS2_SIGSET_MASK)
318			        /* check to make sure signal is not blocked */
319                                if(sigismember(&p->p_sigmask, signum)) {
320				        /* return SIG_HOLD and unblock signal*/
321                                        p->p_retval[0] = (int)IBCS2_SIG_HOLD;
322					p->p_sigmask &= ~sigmask(signum);
323				}
324
325			return 0;
326		}
327
328	case IBCS2_SIGRELSE_MASK:
329		{
330			struct sigprocmask_args sa;
331
332			SCARG(&sa, how) = SIG_UNBLOCK;
333			SCARG(&sa, mask) = sigmask(signum);
334			return sigprocmask(p, &sa);
335		}
336
337	case IBCS2_SIGIGNORE_MASK:
338		{
339			struct sigaction_args sa_args;
340			struct sigaction *bsa;
341
342			bsa = stackgap_alloc(&sg, sizeof(struct sigaction));
343			SCARG(&sa_args, signum) = signum;
344			SCARG(&sa_args, nsa) = bsa;
345			SCARG(&sa_args, osa) = NULL;
346
347			sa.sa_handler = SIG_IGN;
348			sigemptyset(&sa.sa_mask);
349			sa.sa_flags = 0;
350			if ((error = copyout(&sa, bsa, sizeof(sa))) != 0)
351				return error;
352			if ((error = sigaction(p, &sa_args)) != 0) {
353				DPRINTF(("sigignore: sigaction failed\n"));
354				return error;
355			}
356			return 0;
357		}
358
359	case IBCS2_SIGPAUSE_MASK:
360		{
361			struct sigsuspend_args sa;
362
363			SCARG(&sa, mask) = p->p_sigmask &~ sigmask(signum);
364			return sigsuspend(p, &sa);
365		}
366
367	default:
368		return ENOSYS;
369	}
370}
371
372int
373ibcs2_sigprocmask(p, uap)
374	register struct proc *p;
375	struct ibcs2_sigprocmask_args *uap;
376{
377	ibcs2_sigset_t iss;
378	sigset_t bss;
379	int error = 0;
380
381	if (SCARG(uap, oset) != NULL) {
382		/* Fix the return value first if needed */
383		bsd_to_ibcs2_sigset(&p->p_sigmask, &iss);
384		if ((error = copyout(&iss, SCARG(uap, oset), sizeof(iss))) != 0)
385			return error;
386	}
387
388	if (SCARG(uap, set) == NULL)
389		/* Just examine */
390		return 0;
391
392	if ((error = copyin(SCARG(uap, set), &iss, sizeof(iss))) != 0)
393		return error;
394
395	ibcs2_to_bsd_sigset(&iss, &bss);
396
397	(void) splhigh();
398
399	switch (SCARG(uap, how)) {
400	case IBCS2_SIG_BLOCK:
401		p->p_sigmask |= bss & ~sigcantmask;
402		break;
403
404	case IBCS2_SIG_UNBLOCK:
405		p->p_sigmask &= ~bss;
406		break;
407
408	case IBCS2_SIG_SETMASK:
409		p->p_sigmask = bss & ~sigcantmask;
410		break;
411
412	default:
413		error = EINVAL;
414		break;
415	}
416
417	(void) spl0();
418
419	return error;
420}
421
422int
423ibcs2_sigpending(p, uap)
424	register struct proc *p;
425	struct ibcs2_sigpending_args *uap;
426{
427	sigset_t bss;
428	ibcs2_sigset_t iss;
429
430	bss = p->p_siglist & p->p_sigmask;
431	bsd_to_ibcs2_sigset(&bss, &iss);
432
433	return copyout(&iss, SCARG(uap, mask), sizeof(iss));
434}
435
436int
437ibcs2_sigsuspend(p, uap)
438	register struct proc *p;
439	struct ibcs2_sigsuspend_args *uap;
440{
441	ibcs2_sigset_t sss;
442	sigset_t bss;
443	struct sigsuspend_args sa;
444	int error;
445
446	if ((error = copyin(SCARG(uap, mask), &sss, sizeof(sss))) != 0)
447		return error;
448
449	ibcs2_to_bsd_sigset(&sss, &bss);
450
451	SCARG(&sa, mask) = bss;
452	return sigsuspend(p, &sa);
453}
454
455int
456ibcs2_pause(p, uap)
457	register struct proc *p;
458	struct ibcs2_pause_args *uap;
459{
460	struct sigsuspend_args bsa;
461
462	SCARG(&bsa, mask) = p->p_sigmask;
463	return sigsuspend(p, &bsa);
464}
465
466int
467ibcs2_kill(p, uap)
468	register struct proc *p;
469	struct ibcs2_kill_args *uap;
470{
471	struct kill_args ka;
472
473	SCARG(&ka, pid) = SCARG(uap, pid);
474	SCARG(&ka, signum) = ibcs2_to_bsd_sig[SCARG(uap, signo)];
475	return kill(p, &ka);
476}
477