1 /*-
2 * Copyright (c) 1994-1995 Søren Schmidt
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 * in this position and unchanged.
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: releng/5.0/sys/compat/linux/linux_signal.c 104306 2002-10-01 17:15:53Z jmallett $
29 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/lock.h>
34 #include <sys/mutex.h>
35 #include <sys/proc.h>
36 #include <sys/signalvar.h>
37 #include <sys/syscallsubr.h>
38 #include <sys/sysproto.h>
39
40 #include <machine/../linux/linux.h>
41 #include <machine/../linux/linux_proto.h>
42 #include <compat/linux/linux_signal.h>
43 #include <compat/linux/linux_util.h>
44
45 void
46 linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
47 {
48 int b, l;
49
50 SIGEMPTYSET(*bss);
51 bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
52 bss->__bits[1] = lss->__bits[1];
53 for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
54 if (LINUX_SIGISMEMBER(*lss, l)) {
55 #ifdef __alpha__
56 b = _SIG_IDX(l);
57 #else
58 b = linux_to_bsd_signal[_SIG_IDX(l)];
59 #endif
60 if (b)
61 SIGADDSET(*bss, b);
62 }
63 }
64 }
65
66 void
67 bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
68 {
69 int b, l;
70
71 LINUX_SIGEMPTYSET(*lss);
72 lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
73 lss->__bits[1] = bss->__bits[1];
74 for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
75 if (SIGISMEMBER(*bss, b)) {
76 #if __alpha__
77 l = _SIG_IDX(b);
78 #else
79 l = bsd_to_linux_signal[_SIG_IDX(b)];
80 #endif
81 if (l)
82 LINUX_SIGADDSET(*lss, l);
83 }
84 }
85 }
86
87 static void
88 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
89 {
90
91 linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
92 bsa->sa_handler = lsa->lsa_handler;
93 bsa->sa_flags = 0;
94 if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
95 bsa->sa_flags |= SA_NOCLDSTOP;
96 if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
97 bsa->sa_flags |= SA_NOCLDWAIT;
98 if (lsa->lsa_flags & LINUX_SA_SIGINFO)
99 bsa->sa_flags |= SA_SIGINFO;
100 if (lsa->lsa_flags & LINUX_SA_ONSTACK)
101 bsa->sa_flags |= SA_ONSTACK;
102 if (lsa->lsa_flags & LINUX_SA_RESTART)
103 bsa->sa_flags |= SA_RESTART;
104 if (lsa->lsa_flags & LINUX_SA_ONESHOT)
105 bsa->sa_flags |= SA_RESETHAND;
106 if (lsa->lsa_flags & LINUX_SA_NOMASK)
107 bsa->sa_flags |= SA_NODEFER;
108 }
109
110 static void
111 bsd_to_linux_sigaction(struct sigaction *bsa, l_sigaction_t *lsa)
112 {
113
114 bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
115 lsa->lsa_handler = bsa->sa_handler;
116 lsa->lsa_restorer = NULL; /* unsupported */
117 lsa->lsa_flags = 0;
118 if (bsa->sa_flags & SA_NOCLDSTOP)
119 lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
120 if (bsa->sa_flags & SA_NOCLDWAIT)
121 lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
122 if (bsa->sa_flags & SA_SIGINFO)
123 lsa->lsa_flags |= LINUX_SA_SIGINFO;
124 if (bsa->sa_flags & SA_ONSTACK)
125 lsa->lsa_flags |= LINUX_SA_ONSTACK;
126 if (bsa->sa_flags & SA_RESTART)
127 lsa->lsa_flags |= LINUX_SA_RESTART;
128 if (bsa->sa_flags & SA_RESETHAND)
129 lsa->lsa_flags |= LINUX_SA_ONESHOT;
130 if (bsa->sa_flags & SA_NODEFER)
131 lsa->lsa_flags |= LINUX_SA_NOMASK;
132 }
133
134 int
135 linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
136 l_sigaction_t *linux_osa)
137 {
138 struct sigaction act, oact, *nsa, *osa;
139 int error, sig;
140
141 if (linux_sig <= 0 || linux_sig > LINUX_NSIG)
142 return (EINVAL);
143
144 osa = (linux_osa != NULL) ? &oact : NULL;
145 if (linux_nsa != NULL) {
146 nsa = &act;
147 linux_to_bsd_sigaction(linux_nsa, nsa);
148 } else
149 nsa = NULL;
150
151 #ifndef __alpha__
152 if (linux_sig <= LINUX_SIGTBLSZ)
153 sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
154 else
155 #endif
156 sig = linux_sig;
157
158 error = kern_sigaction(td, sig, nsa, osa, 0);
159 if (error)
160 return (error);
161
162 if (linux_osa != NULL)
163 bsd_to_linux_sigaction(osa, linux_osa);
164
165 return (0);
166 }
167
168
169 #ifndef __alpha__
170 int
171 linux_signal(struct thread *td, struct linux_signal_args *args)
172 {
173 l_sigaction_t nsa, osa;
174 int error;
175
176 #ifdef DEBUG
177 if (ldebug(signal))
178 printf(ARGS(signal, "%d, %p"),
179 args->sig, (void *)args->handler);
180 #endif
181
182 nsa.lsa_handler = args->handler;
183 nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
184 LINUX_SIGEMPTYSET(nsa.lsa_mask);
185
186 error = linux_do_sigaction(td, args->sig, &nsa, &osa);
187 td->td_retval[0] = (int)osa.lsa_handler;
188
189 return (error);
190 }
191 #endif /*!__alpha__*/
192
193 int
194 linux_rt_sigaction(struct thread *td, struct linux_rt_sigaction_args *args)
195 {
196 l_sigaction_t nsa, osa;
197 int error;
198
199 #ifdef DEBUG
200 if (ldebug(rt_sigaction))
201 printf(ARGS(rt_sigaction, "%ld, %p, %p, %ld"),
202 (long)args->sig, (void *)args->act,
203 (void *)args->oact, (long)args->sigsetsize);
204 #endif
205
206 if (args->sigsetsize != sizeof(l_sigset_t))
207 return (EINVAL);
208
209 if (args->act != NULL) {
210 error = copyin(args->act, &nsa, sizeof(l_sigaction_t));
211 if (error)
212 return (error);
213 }
214
215 error = linux_do_sigaction(td, args->sig,
216 args->act ? &nsa : NULL,
217 args->oact ? &osa : NULL);
218
219 if (args->oact != NULL && !error) {
220 error = copyout(&osa, args->oact, sizeof(l_sigaction_t));
221 }
222
223 return (error);
224 }
225
226 static int
227 linux_do_sigprocmask(struct thread *td, int how, l_sigset_t *new,
228 l_sigset_t *old)
229 {
230 int error;
231 sigset_t mask;
232 struct proc *p = td->td_proc;
233
234 error = 0;
235 td->td_retval[0] = 0;
236
237 PROC_LOCK(p);
238 if (old != NULL)
239 bsd_to_linux_sigset(&p->p_sigmask, old);
240
241 if (new != NULL) {
242 linux_to_bsd_sigset(new, &mask);
243
244 switch (how) {
245 case LINUX_SIG_BLOCK:
246 SIGSETOR(p->p_sigmask, mask);
247 SIG_CANTMASK(p->p_sigmask);
248 break;
249 case LINUX_SIG_UNBLOCK:
250 SIGSETNAND(p->p_sigmask, mask);
251 signotify(p);
252 break;
253 case LINUX_SIG_SETMASK:
254 p->p_sigmask = mask;
255 SIG_CANTMASK(p->p_sigmask);
256 signotify(p);
257 break;
258 default:
259 error = EINVAL;
260 break;
261 }
262 }
263 PROC_UNLOCK(p);
264
265 return (error);
266 }
267
268 #ifndef __alpha__
269 int
270 linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
271 {
272 l_osigset_t mask;
273 l_sigset_t set, oset;
274 int error;
275
276 #ifdef DEBUG
277 if (ldebug(sigprocmask))
278 printf(ARGS(sigprocmask, "%d, *, *"), args->how);
279 #endif
280
281 if (args->mask != NULL) {
282 error = copyin(args->mask, &mask, sizeof(l_osigset_t));
283 if (error)
284 return (error);
285 LINUX_SIGEMPTYSET(set);
286 set.__bits[0] = mask;
287 }
288
289 error = linux_do_sigprocmask(td, args->how,
290 args->mask ? &set : NULL,
291 args->omask ? &oset : NULL);
292
293 if (args->omask != NULL && !error) {
294 mask = oset.__bits[0];
295 error = copyout(&mask, args->omask, sizeof(l_osigset_t));
296 }
297
298 return (error);
299 }
300 #endif /*!__alpha__*/
301
302 int
303 linux_rt_sigprocmask(struct thread *td, struct linux_rt_sigprocmask_args *args)
304 {
305 l_sigset_t set, oset;
306 int error;
307
308 #ifdef DEBUG
309 if (ldebug(rt_sigprocmask))
310 printf(ARGS(rt_sigprocmask, "%d, %p, %p, %ld"),
311 args->how, (void *)args->mask,
312 (void *)args->omask, (long)args->sigsetsize);
313 #endif
314
315 if (args->sigsetsize != sizeof(l_sigset_t))
316 return EINVAL;
317
318 if (args->mask != NULL) {
319 error = copyin(args->mask, &set, sizeof(l_sigset_t));
320 if (error)
321 return (error);
322 }
323
324 error = linux_do_sigprocmask(td, args->how,
325 args->mask ? &set : NULL,
326 args->omask ? &oset : NULL);
327
328 if (args->omask != NULL && !error) {
329 error = copyout(&oset, args->omask, sizeof(l_sigset_t));
330 }
331
332 return (error);
333 }
334
335 #ifndef __alpha__
336 int
337 linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
338 {
339 struct proc *p = td->td_proc;
340 l_sigset_t mask;
341
342 #ifdef DEBUG
343 if (ldebug(sgetmask))
344 printf(ARGS(sgetmask, ""));
345 #endif
346
347 PROC_LOCK(p);
348 bsd_to_linux_sigset(&p->p_sigmask, &mask);
349 PROC_UNLOCK(p);
350 td->td_retval[0] = mask.__bits[0];
351 return (0);
352 }
353
354 int
355 linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
356 {
357 struct proc *p = td->td_proc;
358 l_sigset_t lset;
359 sigset_t bset;
360
361 #ifdef DEBUG
362 if (ldebug(ssetmask))
363 printf(ARGS(ssetmask, "%08lx"), (unsigned long)args->mask);
364 #endif
365
366 PROC_LOCK(p);
367 bsd_to_linux_sigset(&p->p_sigmask, &lset);
368 td->td_retval[0] = lset.__bits[0];
369 LINUX_SIGEMPTYSET(lset);
370 lset.__bits[0] = args->mask;
371 linux_to_bsd_sigset(&lset, &bset);
372 p->p_sigmask = bset;
373 SIG_CANTMASK(p->p_sigmask);
374 signotify(p);
375 PROC_UNLOCK(p);
376 return (0);
377 }
378
379 int
380 linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
381 {
382 struct proc *p = td->td_proc;
383 sigset_t bset;
384 l_sigset_t lset;
385 l_osigset_t mask;
386
387 #ifdef DEBUG
388 if (ldebug(sigpending))
389 printf(ARGS(sigpending, "*"));
390 #endif
391
392 PROC_LOCK(p);
393 bset = p->p_siglist;
394 SIGSETAND(bset, p->p_sigmask);
395 bsd_to_linux_sigset(&bset, &lset);
396 PROC_UNLOCK(p);
397 mask = lset.__bits[0];
398 return (copyout(&mask, args->mask, sizeof(mask)));
399 }
400 #endif /*!__alpha__*/
401
402 int
403 linux_kill(struct thread *td, struct linux_kill_args *args)
404 {
405 struct kill_args /* {
406 int pid;
407 int signum;
408 } */ tmp;
409
410 #ifdef DEBUG
411 if (ldebug(kill))
412 printf(ARGS(kill, "%d, %d"), args->pid, args->signum);
413 #endif
414
415 /*
416 * Allow signal 0 as a means to check for privileges
417 */
418 if (args->signum < 0 || args->signum > LINUX_NSIG)
419 return EINVAL;
420
421 #ifndef __alpha__
422 if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
423 tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
424 else
425 #endif
426 tmp.signum = args->signum;
427
428 tmp.pid = args->pid;
429 return (kill(td, &tmp));
430 }
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