1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
|
/*
* Copyright (c) 2005, David Xu <davidxu@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "namespace.h"
#include <sys/param.h>
#include <sys/types.h>
#include <sys/signalvar.h>
#include <sys/syscall.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include "un-namespace.h"
#include "libc_private.h"
#include "libc_private.h"
#include "thr_private.h"
/* #define DEBUG_SIGNAL */
#ifdef DEBUG_SIGNAL
#define DBG_MSG stdout_debug
#else
#define DBG_MSG(x...)
#endif
struct usigaction {
struct sigaction sigact;
struct urwlock lock;
};
static struct usigaction _thr_sigact[_SIG_MAXSIG];
static inline struct usigaction *
__libc_sigaction_slot(int signo)
{
return (&_thr_sigact[signo - 1]);
}
static void thr_sighandler(int, siginfo_t *, void *);
static void handle_signal(struct sigaction *, int, siginfo_t *, ucontext_t *);
static void check_deferred_signal(struct pthread *);
static void check_suspend(struct pthread *);
static void check_cancel(struct pthread *curthread, ucontext_t *ucp);
int _sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec * timeout);
int _sigwaitinfo(const sigset_t *set, siginfo_t *info);
int _sigwait(const sigset_t *set, int *sig);
int _setcontext(const ucontext_t *);
int _swapcontext(ucontext_t *, const ucontext_t *);
static const sigset_t _thr_deferset={{
0xffffffff & ~(_SIG_BIT(SIGBUS)|_SIG_BIT(SIGILL)|_SIG_BIT(SIGFPE)|
_SIG_BIT(SIGSEGV)|_SIG_BIT(SIGTRAP)|_SIG_BIT(SIGSYS)),
0xffffffff,
0xffffffff,
0xffffffff}};
static const sigset_t _thr_maskset={{
0xffffffff,
0xffffffff,
0xffffffff,
0xffffffff}};
void
_thr_signal_block(struct pthread *curthread)
{
if (curthread->sigblock > 0) {
curthread->sigblock++;
return;
}
__sys_sigprocmask(SIG_BLOCK, &_thr_maskset, &curthread->sigmask);
curthread->sigblock++;
}
void
_thr_signal_unblock(struct pthread *curthread)
{
if (--curthread->sigblock == 0)
__sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL);
}
int
_thr_send_sig(struct pthread *thread, int sig)
{
return thr_kill(thread->tid, sig);
}
static inline void
remove_thr_signals(sigset_t *set)
{
if (SIGISMEMBER(*set, SIGCANCEL))
SIGDELSET(*set, SIGCANCEL);
}
static const sigset_t *
thr_remove_thr_signals(const sigset_t *set, sigset_t *newset)
{
*newset = *set;
remove_thr_signals(newset);
return (newset);
}
static void
sigcancel_handler(int sig __unused,
siginfo_t *info __unused, ucontext_t *ucp)
{
struct pthread *curthread = _get_curthread();
int err;
if (THR_IN_CRITICAL(curthread))
return;
err = errno;
check_suspend(curthread);
check_cancel(curthread, ucp);
errno = err;
}
typedef void (*ohandler)(int sig, int code, struct sigcontext *scp,
char *addr, __sighandler_t *catcher);
/*
* The signal handler wrapper is entered with all signal masked.
*/
static void
thr_sighandler(int sig, siginfo_t *info, void *_ucp)
{
struct pthread *curthread;
ucontext_t *ucp;
struct sigaction act;
struct usigaction *usa;
int err;
err = errno;
curthread = _get_curthread();
ucp = _ucp;
usa = __libc_sigaction_slot(sig);
_thr_rwl_rdlock(&usa->lock);
act = usa->sigact;
_thr_rwl_unlock(&usa->lock);
errno = err;
curthread->deferred_run = 0;
/*
* if a thread is in critical region, for example it holds low level locks,
* try to defer the signal processing, however if the signal is synchronous
* signal, it means a bad thing has happened, this is a programming error,
* resuming fault point can not help anything (normally causes deadloop),
* so here we let user code handle it immediately.
*/
if (THR_IN_CRITICAL(curthread) && SIGISMEMBER(_thr_deferset, sig)) {
memcpy(&curthread->deferred_sigact, &act, sizeof(struct sigaction));
memcpy(&curthread->deferred_siginfo, info, sizeof(siginfo_t));
curthread->deferred_sigmask = ucp->uc_sigmask;
/* mask all signals, we will restore it later. */
ucp->uc_sigmask = _thr_deferset;
return;
}
handle_signal(&act, sig, info, ucp);
}
static void
handle_signal(struct sigaction *actp, int sig, siginfo_t *info, ucontext_t *ucp)
{
struct pthread *curthread = _get_curthread();
ucontext_t uc2;
__siginfohandler_t *sigfunc;
int cancel_point;
int cancel_async;
int cancel_enable;
int in_sigsuspend;
int err;
/* add previous level mask */
SIGSETOR(actp->sa_mask, ucp->uc_sigmask);
/* add this signal's mask */
if (!(actp->sa_flags & SA_NODEFER))
SIGADDSET(actp->sa_mask, sig);
in_sigsuspend = curthread->in_sigsuspend;
curthread->in_sigsuspend = 0;
/*
* If thread is in deferred cancellation mode, disable cancellation
* in signal handler.
* If user signal handler calls a cancellation point function, e.g,
* it calls write() to write data to file, because write() is a
* cancellation point, the thread is immediately cancelled if
* cancellation is pending, to avoid this problem while thread is in
* deferring mode, cancellation is temporarily disabled.
*/
cancel_point = curthread->cancel_point;
cancel_async = curthread->cancel_async;
cancel_enable = curthread->cancel_enable;
curthread->cancel_point = 0;
if (!cancel_async)
curthread->cancel_enable = 0;
/* restore correct mask before calling user handler */
__sys_sigprocmask(SIG_SETMASK, &actp->sa_mask, NULL);
sigfunc = actp->sa_sigaction;
/*
* We have already reset cancellation point flags, so if user's code
* longjmp()s out of its signal handler, wish its jmpbuf was set
* outside of a cancellation point, in most cases, this would be
* true. However, there is no way to save cancel_enable in jmpbuf,
* so after setjmps() returns once more, the user code may need to
* re-set cancel_enable flag by calling pthread_setcancelstate().
*/
if ((actp->sa_flags & SA_SIGINFO) != 0) {
sigfunc(sig, info, ucp);
} else {
((ohandler)sigfunc)(sig, info->si_code,
(struct sigcontext *)ucp, info->si_addr,
(__sighandler_t *)sigfunc);
}
err = errno;
curthread->in_sigsuspend = in_sigsuspend;
curthread->cancel_point = cancel_point;
curthread->cancel_enable = cancel_enable;
memcpy(&uc2, ucp, sizeof(uc2));
SIGDELSET(uc2.uc_sigmask, SIGCANCEL);
/* reschedule cancellation */
check_cancel(curthread, &uc2);
errno = err;
syscall(SYS_sigreturn, &uc2);
}
void
_thr_ast(struct pthread *curthread)
{
if (!THR_IN_CRITICAL(curthread)) {
check_deferred_signal(curthread);
check_suspend(curthread);
check_cancel(curthread, NULL);
}
}
/* reschedule cancellation */
static void
check_cancel(struct pthread *curthread, ucontext_t *ucp)
{
if (__predict_true(!curthread->cancel_pending ||
!curthread->cancel_enable || curthread->no_cancel))
return;
/*
* Otherwise, we are in defer mode, and we are at
* cancel point, tell kernel to not block the current
* thread on next cancelable system call.
*
* There are three cases we should call thr_wake() to
* turn on TDP_WAKEUP or send SIGCANCEL in kernel:
* 1) we are going to call a cancelable system call,
* non-zero cancel_point means we are already in
* cancelable state, next system call is cancelable.
* 2) because _thr_ast() may be called by
* THR_CRITICAL_LEAVE() which is used by rtld rwlock
* and any libthr internal locks, when rtld rwlock
* is used, it is mostly caused by an unresolved PLT.
* Those routines may clear the TDP_WAKEUP flag by
* invoking some system calls, in those cases, we
* also should reenable the flag.
* 3) thread is in sigsuspend(), and the syscall insists
* on getting a signal before it agrees to return.
*/
if (curthread->cancel_point) {
if (curthread->in_sigsuspend && ucp) {
SIGADDSET(ucp->uc_sigmask, SIGCANCEL);
curthread->unblock_sigcancel = 1;
_thr_send_sig(curthread, SIGCANCEL);
} else
thr_wake(curthread->tid);
} else if (curthread->cancel_async) {
/*
* asynchronous cancellation mode, act upon
* immediately.
*/
_pthread_exit_mask(PTHREAD_CANCELED,
ucp? &ucp->uc_sigmask : NULL);
}
}
static void
check_deferred_signal(struct pthread *curthread)
{
ucontext_t *uc;
struct sigaction act;
siginfo_t info;
int uc_len;
if (__predict_true(curthread->deferred_siginfo.si_signo == 0 ||
curthread->deferred_run))
return;
curthread->deferred_run = 1;
uc_len = __getcontextx_size();
uc = alloca(uc_len);
getcontext(uc);
if (curthread->deferred_siginfo.si_signo == 0) {
curthread->deferred_run = 0;
return;
}
__fillcontextx2((char *)uc);
act = curthread->deferred_sigact;
uc->uc_sigmask = curthread->deferred_sigmask;
memcpy(&info, &curthread->deferred_siginfo, sizeof(siginfo_t));
/* remove signal */
curthread->deferred_siginfo.si_signo = 0;
handle_signal(&act, info.si_signo, &info, uc);
}
static void
check_suspend(struct pthread *curthread)
{
uint32_t cycle;
if (__predict_true((curthread->flags &
(THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED))
!= THR_FLAGS_NEED_SUSPEND))
return;
if (curthread == _single_thread)
return;
if (curthread->force_exit)
return;
/*
* Blocks SIGCANCEL which other threads must send.
*/
_thr_signal_block(curthread);
/*
* Increase critical_count, here we don't use THR_LOCK/UNLOCK
* because we are leaf code, we don't want to recursively call
* ourself.
*/
curthread->critical_count++;
THR_UMUTEX_LOCK(curthread, &(curthread)->lock);
while ((curthread->flags & (THR_FLAGS_NEED_SUSPEND |
THR_FLAGS_SUSPENDED)) == THR_FLAGS_NEED_SUSPEND) {
curthread->cycle++;
cycle = curthread->cycle;
/* Wake the thread suspending us. */
_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
/*
* if we are from pthread_exit, we don't want to
* suspend, just go and die.
*/
if (curthread->state == PS_DEAD)
break;
curthread->flags |= THR_FLAGS_SUSPENDED;
THR_UMUTEX_UNLOCK(curthread, &(curthread)->lock);
_thr_umtx_wait_uint(&curthread->cycle, cycle, NULL, 0);
THR_UMUTEX_LOCK(curthread, &(curthread)->lock);
curthread->flags &= ~THR_FLAGS_SUSPENDED;
}
THR_UMUTEX_UNLOCK(curthread, &(curthread)->lock);
curthread->critical_count--;
_thr_signal_unblock(curthread);
}
void
_thr_signal_init(int dlopened)
{
struct sigaction act, nact, oact;
struct usigaction *usa;
sigset_t oldset;
int sig, error;
if (dlopened) {
__sys_sigprocmask(SIG_SETMASK, &_thr_maskset, &oldset);
for (sig = 1; sig <= _SIG_MAXSIG; sig++) {
if (sig == SIGCANCEL)
continue;
error = __sys_sigaction(sig, NULL, &oact);
if (error == -1 || oact.sa_handler == SIG_DFL ||
oact.sa_handler == SIG_IGN)
continue;
usa = __libc_sigaction_slot(sig);
usa->sigact = oact;
nact = oact;
remove_thr_signals(&usa->sigact.sa_mask);
nact.sa_flags &= ~SA_NODEFER;
nact.sa_flags |= SA_SIGINFO;
nact.sa_sigaction = thr_sighandler;
nact.sa_mask = _thr_maskset;
(void)__sys_sigaction(sig, &nact, NULL);
}
__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
}
/* Install SIGCANCEL handler. */
SIGFILLSET(act.sa_mask);
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = (__siginfohandler_t *)&sigcancel_handler;
__sys_sigaction(SIGCANCEL, &act, NULL);
/* Unblock SIGCANCEL */
SIGEMPTYSET(act.sa_mask);
SIGADDSET(act.sa_mask, SIGCANCEL);
__sys_sigprocmask(SIG_UNBLOCK, &act.sa_mask, NULL);
}
void
_thr_sigact_unload(struct dl_phdr_info *phdr_info)
{
#if 0
struct pthread *curthread = _get_curthread();
struct urwlock *rwlp;
struct sigaction *actp;
struct usigaction *usa;
struct sigaction kact;
void (*handler)(int);
int sig;
_thr_signal_block(curthread);
for (sig = 1; sig <= _SIG_MAXSIG; sig++) {
usa = __libc_sigaction_slot(sig);
actp = &usa->sigact;
retry:
handler = actp->sa_handler;
if (handler != SIG_DFL && handler != SIG_IGN &&
__elf_phdr_match_addr(phdr_info, handler)) {
rwlp = &usa->lock;
_thr_rwl_wrlock(rwlp);
if (handler != actp->sa_handler) {
_thr_rwl_unlock(rwlp);
goto retry;
}
actp->sa_handler = SIG_DFL;
actp->sa_flags = SA_SIGINFO;
SIGEMPTYSET(actp->sa_mask);
if (__sys_sigaction(sig, NULL, &kact) == 0 &&
kact.sa_handler != SIG_DFL &&
kact.sa_handler != SIG_IGN)
__sys_sigaction(sig, actp, NULL);
_thr_rwl_unlock(rwlp);
}
}
_thr_signal_unblock(curthread);
#endif
}
void
_thr_signal_prefork(void)
{
int i;
for (i = 1; i <= _SIG_MAXSIG; ++i)
_thr_rwl_rdlock(&__libc_sigaction_slot(i)->lock);
}
void
_thr_signal_postfork(void)
{
int i;
for (i = 1; i <= _SIG_MAXSIG; ++i)
_thr_rwl_unlock(&__libc_sigaction_slot(i)->lock);
}
void
_thr_signal_postfork_child(void)
{
int i;
for (i = 1; i <= _SIG_MAXSIG; ++i) {
bzero(&__libc_sigaction_slot(i) -> lock,
sizeof(struct urwlock));
}
}
void
_thr_signal_deinit(void)
{
}
int
__thr_sigaction(int sig, const struct sigaction *act, struct sigaction *oact)
{
struct sigaction newact, oldact, oldact2;
sigset_t oldset;
struct usigaction *usa;
int ret, err;
if (!_SIG_VALID(sig) || sig == SIGCANCEL) {
errno = EINVAL;
return (-1);
}
ret = 0;
err = 0;
usa = __libc_sigaction_slot(sig);
__sys_sigprocmask(SIG_SETMASK, &_thr_maskset, &oldset);
_thr_rwl_wrlock(&usa->lock);
if (act != NULL) {
oldact2 = usa->sigact;
newact = *act;
/*
* if a new sig handler is SIG_DFL or SIG_IGN,
* don't remove old handler from __libc_sigact[],
* so deferred signals still can use the handlers,
* multiple threads invoking sigaction itself is
* a race condition, so it is not a problem.
*/
if (newact.sa_handler != SIG_DFL &&
newact.sa_handler != SIG_IGN) {
usa->sigact = newact;
remove_thr_signals(&usa->sigact.sa_mask);
newact.sa_flags &= ~SA_NODEFER;
newact.sa_flags |= SA_SIGINFO;
newact.sa_sigaction = thr_sighandler;
newact.sa_mask = _thr_maskset; /* mask all signals */
}
ret = __sys_sigaction(sig, &newact, &oldact);
if (ret == -1) {
err = errno;
usa->sigact = oldact2;
}
} else if (oact != NULL) {
ret = __sys_sigaction(sig, NULL, &oldact);
err = errno;
}
if (oldact.sa_handler != SIG_DFL && oldact.sa_handler != SIG_IGN) {
if (act != NULL)
oldact = oldact2;
else if (oact != NULL)
oldact = usa->sigact;
}
_thr_rwl_unlock(&usa->lock);
__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
if (ret == 0) {
if (oact != NULL)
*oact = oldact;
} else {
errno = err;
}
return (ret);
}
int
__thr_sigprocmask(int how, const sigset_t *set, sigset_t *oset)
{
const sigset_t *p = set;
sigset_t newset;
if (how != SIG_UNBLOCK) {
if (set != NULL) {
newset = *set;
SIGDELSET(newset, SIGCANCEL);
p = &newset;
}
}
return (__sys_sigprocmask(how, p, oset));
}
__weak_reference(_pthread_sigmask, pthread_sigmask);
int
_pthread_sigmask(int how, const sigset_t *set, sigset_t *oset)
{
if (__thr_sigprocmask(how, set, oset))
return (errno);
return (0);
}
int
_sigsuspend(const sigset_t * set)
{
sigset_t newset;
return (__sys_sigsuspend(thr_remove_thr_signals(set, &newset)));
}
int
__thr_sigsuspend(const sigset_t * set)
{
struct pthread *curthread;
sigset_t newset;
int ret, old;
curthread = _get_curthread();
old = curthread->in_sigsuspend;
curthread->in_sigsuspend = 1;
_thr_cancel_enter(curthread);
ret = __sys_sigsuspend(thr_remove_thr_signals(set, &newset));
_thr_cancel_leave(curthread, 1);
curthread->in_sigsuspend = old;
if (curthread->unblock_sigcancel) {
curthread->unblock_sigcancel = 0;
SIGEMPTYSET(newset);
SIGADDSET(newset, SIGCANCEL);
__sys_sigprocmask(SIG_UNBLOCK, &newset, NULL);
}
return (ret);
}
int
_sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec * timeout)
{
sigset_t newset;
return (__sys_sigtimedwait(thr_remove_thr_signals(set, &newset), info,
timeout));
}
/*
* Cancellation behavior:
* Thread may be canceled at start, if thread got signal,
* it is not canceled.
*/
int
__thr_sigtimedwait(const sigset_t *set, siginfo_t *info,
const struct timespec * timeout)
{
struct pthread *curthread = _get_curthread();
sigset_t newset;
int ret;
_thr_cancel_enter(curthread);
ret = __sys_sigtimedwait(thr_remove_thr_signals(set, &newset), info,
timeout);
_thr_cancel_leave(curthread, (ret == -1));
return (ret);
}
int
_sigwaitinfo(const sigset_t *set, siginfo_t *info)
{
sigset_t newset;
return (__sys_sigwaitinfo(thr_remove_thr_signals(set, &newset), info));
}
/*
* Cancellation behavior:
* Thread may be canceled at start, if thread got signal,
* it is not canceled.
*/
int
__thr_sigwaitinfo(const sigset_t *set, siginfo_t *info)
{
struct pthread *curthread = _get_curthread();
sigset_t newset;
int ret;
_thr_cancel_enter(curthread);
ret = __sys_sigwaitinfo(thr_remove_thr_signals(set, &newset), info);
_thr_cancel_leave(curthread, ret == -1);
return (ret);
}
int
_sigwait(const sigset_t *set, int *sig)
{
sigset_t newset;
return (__sys_sigwait(thr_remove_thr_signals(set, &newset), sig));
}
/*
* Cancellation behavior:
* Thread may be canceled at start, if thread got signal,
* it is not canceled.
*/
int
__thr_sigwait(const sigset_t *set, int *sig)
{
struct pthread *curthread = _get_curthread();
sigset_t newset;
int ret;
do {
_thr_cancel_enter(curthread);
ret = __sys_sigwait(thr_remove_thr_signals(set, &newset), sig);
_thr_cancel_leave(curthread, (ret != 0));
} while (ret == EINTR);
return (ret);
}
int
__thr_setcontext(const ucontext_t *ucp)
{
ucontext_t uc;
if (ucp == NULL) {
errno = EINVAL;
return (-1);
}
if (!SIGISMEMBER(uc.uc_sigmask, SIGCANCEL))
return __sys_setcontext(ucp);
(void) memcpy(&uc, ucp, sizeof(uc));
SIGDELSET(uc.uc_sigmask, SIGCANCEL);
return (__sys_setcontext(&uc));
}
int
__thr_swapcontext(ucontext_t *oucp, const ucontext_t *ucp)
{
ucontext_t uc;
if (oucp == NULL || ucp == NULL) {
errno = EINVAL;
return (-1);
}
if (SIGISMEMBER(ucp->uc_sigmask, SIGCANCEL)) {
(void) memcpy(&uc, ucp, sizeof(uc));
SIGDELSET(uc.uc_sigmask, SIGCANCEL);
ucp = &uc;
}
return (__sys_swapcontext(oucp, ucp));
}
|