Repository navigation
Expand file tree
/
Copy pathsignalmodule.c
More file actions
1656 lines (1386 loc) · 40.8 KB
/
Copy pathsignalmodule.c
File metadata and controls
1656 lines (1386 loc) · 40.8 KB
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
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Signal module -- many thanks to Lance Ellinghaus */
/* XXX Signals should be recorded per thread, now we have thread state. */
#include "Python.h"
#ifndef MS_WINDOWS
#include "posixmodule.h"
#endif
#ifdef MS_WINDOWS
#include "socketmodule.h" /* needed for SOCKET_T */
#endif
#ifdef MS_WINDOWS
#include <windows.h>
#ifdef HAVE_PROCESS_H
#include <process.h>
#endif
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if defined(HAVE_PTHREAD_SIGMASK) && !defined(HAVE_BROKEN_PTHREAD_SIGMASK)
# define PYPTHREAD_SIGMASK
#endif
#if defined(PYPTHREAD_SIGMASK) && defined(HAVE_PTHREAD_H)
# include <pthread.h>
#endif
#ifndef SIG_ERR
#define SIG_ERR ((PyOS_sighandler_t)(-1))
#endif
#ifndef NSIG
# if defined(_NSIG)
# define NSIG _NSIG /* For BSD/SysV */
# elif defined(_SIGMAX)
# define NSIG (_SIGMAX + 1) /* For QNX */
# elif defined(SIGMAX)
# define NSIG (SIGMAX + 1) /* For djgpp */
# else
# define NSIG 64 /* Use a reasonable default value */
# endif
#endif
#include "clinic/signalmodule.c.h"
/*[clinic input]
module signal
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b0301a3bde5fe9d3]*/
/*
NOTES ON THE INTERACTION BETWEEN SIGNALS AND THREADS
When threads are supported, we want the following semantics:
- only the main thread can set a signal handler
- any thread can get a signal handler
- signals are only delivered to the main thread
I.e. we don't support "synchronous signals" like SIGFPE (catching
this doesn't make much sense in Python anyway) nor do we support
signals as a means of inter-thread communication, since not all
thread implementations support that (at least our thread library
doesn't).
We still have the problem that in some implementations signals
generated by the keyboard (e.g. SIGINT) are delivered to all
threads (e.g. SGI), while in others (e.g. Solaris) such signals are
delivered to one random thread (an intermediate possibility would
be to deliver it to the main thread -- POSIX?). For now, we have
a working implementation that works in all three cases -- the
handler ignores signals if getpid() isn't the same as in the main
thread. XXX This is a hack.
*/
#ifdef WITH_THREAD
#include <sys/types.h> /* For pid_t */
#include "pythread.h"
static long main_thread;
static pid_t main_pid;
#endif
static volatile struct {
sig_atomic_t tripped;
PyObject *func;
} Handlers[NSIG];
#ifdef MS_WINDOWS
#define INVALID_FD ((SOCKET_T)-1)
static volatile struct {
SOCKET_T fd;
int use_send;
int send_err_set;
int send_errno;
int send_win_error;
} wakeup = {INVALID_FD, 0, 0};
#else
#define INVALID_FD (-1)
static volatile sig_atomic_t wakeup_fd = -1;
#endif
/* Speed up sigcheck() when none tripped */
static volatile sig_atomic_t is_tripped = 0;
static PyObject *DefaultHandler;
static PyObject *IgnoreHandler;
static PyObject *IntHandler;
/* On Solaris 8, gcc will produce a warning that the function
declaration is not a prototype. This is caused by the definition of
SIG_DFL as (void (*)())0; the correct declaration would have been
(void (*)(int))0. */
static PyOS_sighandler_t old_siginthandler = SIG_DFL;
#ifdef MS_WINDOWS
static HANDLE sigint_event = NULL;
#endif
#ifdef HAVE_GETITIMER
static PyObject *ItimerError;
/* auxiliary functions for setitimer/getitimer */
static void
timeval_from_double(double d, struct timeval *tv)
{
tv->tv_sec = floor(d);
tv->tv_usec = fmod(d, 1.0) * 1000000.0;
/* Don't disable the timer if the computation above rounds down to zero. */
if (d > 0.0 && tv->tv_sec == 0 && tv->tv_usec == 0) {
tv->tv_usec = 1;
}
}
Py_LOCAL_INLINE(double)
double_from_timeval(struct timeval *tv)
{
return tv->tv_sec + (double)(tv->tv_usec / 1000000.0);
}
static PyObject *
itimer_retval(struct itimerval *iv)
{
PyObject *r, *v;
r = PyTuple_New(2);
if (r == NULL)
return NULL;
if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_value)))) {
Py_DECREF(r);
return NULL;
}
PyTuple_SET_ITEM(r, 0, v);
if(!(v = PyFloat_FromDouble(double_from_timeval(&iv->it_interval)))) {
Py_DECREF(r);
return NULL;
}
PyTuple_SET_ITEM(r, 1, v);
return r;
}
#endif
static PyObject *
signal_default_int_handler(PyObject *self, PyObject *args)
{
PyErr_SetNone(PyExc_KeyboardInterrupt);
return NULL;
}
PyDoc_STRVAR(default_int_handler_doc,
"default_int_handler(...)\n\
\n\
The default handler for SIGINT installed by Python.\n\
It raises KeyboardInterrupt.");
static int
report_wakeup_write_error(void *data)
{
int save_errno = errno;
errno = (int) (intptr_t) data;
PyErr_SetFromErrno(PyExc_OSError);
PySys_WriteStderr("Exception ignored when trying to write to the "
"signal wakeup fd:\n");
PyErr_WriteUnraisable(NULL);
errno = save_errno;
return 0;
}
#ifdef MS_WINDOWS
static int
report_wakeup_send_error(void* Py_UNUSED(data))
{
PyObject *res;
if (wakeup.send_win_error) {
/* PyErr_SetExcFromWindowsErr() invokes FormatMessage() which
recognizes the error codes used by both GetLastError() and
WSAGetLastError */
res = PyErr_SetExcFromWindowsErr(PyExc_OSError, wakeup.send_win_error);
}
else {
errno = wakeup.send_errno;
res = PyErr_SetFromErrno(PyExc_OSError);
}
assert(res == NULL);
wakeup.send_err_set = 0;
PySys_WriteStderr("Exception ignored when trying to send to the "
"signal wakeup fd:\n");
PyErr_WriteUnraisable(NULL);
return 0;
}
#endif /* MS_WINDOWS */
static void
trip_signal(int sig_num)
{
unsigned char byte;
int fd;
Py_ssize_t rc;
Handlers[sig_num].tripped = 1;
/* Set is_tripped after setting .tripped, as it gets
cleared in PyErr_CheckSignals() before .tripped. */
is_tripped = 1;
_PyEval_SignalReceived();
/* And then write to the wakeup fd *after* setting all the globals and
doing the _PyEval_SignalReceived. We used to write to the wakeup fd
and then set the flag, but this allowed the following sequence of events
(especially on windows, where trip_signal may run in a new thread):
- main thread blocks on select([wakeup_fd], ...)
- signal arrives
- trip_signal writes to the wakeup fd
- the main thread wakes up
- the main thread checks the signal flags, sees that they're unset
- the main thread empties the wakeup fd
- the main thread goes back to sleep
- trip_signal sets the flags to request the Python-level signal handler
be run
- the main thread doesn't notice, because it's asleep
See bpo-30038 for more details.
*/
#ifdef MS_WINDOWS
fd = Py_SAFE_DOWNCAST(wakeup.fd, SOCKET_T, int);
#else
fd = wakeup_fd;
#endif
if (fd != INVALID_FD) {
byte = (unsigned char)sig_num;
#ifdef MS_WINDOWS
if (wakeup.use_send) {
do {
rc = send(fd, &byte, 1, 0);
} while (rc < 0 && errno == EINTR);
/* we only have a storage for one error in the wakeup structure */
if (rc < 0 && !wakeup.send_err_set) {
wakeup.send_err_set = 1;
wakeup.send_errno = errno;
wakeup.send_win_error = GetLastError();
/* Py_AddPendingCall() isn't signal-safe, but we
still use it for this exceptional case. */
Py_AddPendingCall(report_wakeup_send_error, NULL);
}
}
else
#endif
{
byte = (unsigned char)sig_num;
/* _Py_write_noraise() retries write() if write() is interrupted by
a signal (fails with EINTR). */
rc = _Py_write_noraise(fd, &byte, 1);
if (rc < 0) {
/* Py_AddPendingCall() isn't signal-safe, but we
still use it for this exceptional case. */
Py_AddPendingCall(report_wakeup_write_error,
(void *)(intptr_t)errno);
}
}
}
}
static void
signal_handler(int sig_num)
{
int save_errno = errno;
#ifdef WITH_THREAD
/* See NOTES section above */
if (getpid() == main_pid)
#endif
{
trip_signal(sig_num);
}
#ifndef HAVE_SIGACTION
#ifdef SIGCHLD
/* To avoid infinite recursion, this signal remains
reset until explicit re-instated.
Don't clear the 'func' field as it is our pointer
to the Python handler... */
if (sig_num != SIGCHLD)
#endif
/* If the handler was not set up with sigaction, reinstall it. See
* Python/pylifecycle.c for the implementation of PyOS_setsig which
* makes this true. See also issue8354. */
PyOS_setsig(sig_num, signal_handler);
#endif
/* Issue #10311: asynchronously executing signal handlers should not
mutate errno under the feet of unsuspecting C code. */
errno = save_errno;
#ifdef MS_WINDOWS
if (sig_num == SIGINT)
SetEvent(sigint_event);
#endif
}
#ifdef HAVE_ALARM
/*[clinic input]
signal.alarm -> long
seconds: int
/
Arrange for SIGALRM to arrive after the given number of seconds.
[clinic start generated code]*/
static long
signal_alarm_impl(PyObject *module, int seconds)
/*[clinic end generated code: output=144232290814c298 input=0d5e97e0e6f39e86]*/
{
/* alarm() returns the number of seconds remaining */
return (long)alarm(seconds);
}
#endif
#ifdef HAVE_PAUSE
/*[clinic input]
signal.pause
Wait until a signal arrives.
[clinic start generated code]*/
static PyObject *
signal_pause_impl(PyObject *module)
/*[clinic end generated code: output=391656788b3c3929 input=f03de0f875752062]*/
{
Py_BEGIN_ALLOW_THREADS
(void)pause();
Py_END_ALLOW_THREADS
/* make sure that any exceptions that got raised are propagated
* back into Python
*/
if (PyErr_CheckSignals())
return NULL;
Py_RETURN_NONE;
}
#endif
/*[clinic input]
signal.signal
signalnum: int
handler: object
/
Set the action for the given signal.
The action can be SIG_DFL, SIG_IGN, or a callable Python object.
The previous action is returned. See getsignal() for possible return values.
*** IMPORTANT NOTICE ***
A signal handler function is called with two arguments:
the first is the signal number, the second is the interrupted stack frame.
[clinic start generated code]*/
static PyObject *
signal_signal_impl(PyObject *module, int signalnum, PyObject *handler)
/*[clinic end generated code: output=b44cfda43780f3a1 input=deee84af5fa0432c]*/
{
PyObject *old_handler;
void (*func)(int);
#ifdef MS_WINDOWS
/* Validate that signalnum is one of the allowable signals */
switch (signalnum) {
case SIGABRT: break;
#ifdef SIGBREAK
/* Issue #10003: SIGBREAK is not documented as permitted, but works
and corresponds to CTRL_BREAK_EVENT. */
case SIGBREAK: break;
#endif
case SIGFPE: break;
case SIGILL: break;
case SIGINT: break;
case SIGSEGV: break;
case SIGTERM: break;
default:
PyErr_SetString(PyExc_ValueError, "invalid signal value");
return NULL;
}
#endif
#ifdef WITH_THREAD
if (PyThread_get_thread_ident() != main_thread) {
PyErr_SetString(PyExc_ValueError,
"signal only works in main thread");
return NULL;
}
#endif
if (signalnum < 1 || signalnum >= NSIG) {
PyErr_SetString(PyExc_ValueError,
"signal number out of range");
return NULL;
}
if (handler == IgnoreHandler)
func = SIG_IGN;
else if (handler == DefaultHandler)
func = SIG_DFL;
else if (!PyCallable_Check(handler)) {
PyErr_SetString(PyExc_TypeError,
"signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object");
return NULL;
}
else
func = signal_handler;
if (PyOS_setsig(signalnum, func) == SIG_ERR) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
old_handler = Handlers[signalnum].func;
Handlers[signalnum].tripped = 0;
Py_INCREF(handler);
Handlers[signalnum].func = handler;
if (old_handler != NULL)
return old_handler;
else
Py_RETURN_NONE;
}
/*[clinic input]
signal.getsignal
signalnum: int
/
Return the current action for the given signal.
The return value can be:
SIG_IGN -- if the signal is being ignored
SIG_DFL -- if the default action for the signal is in effect
None -- if an unknown handler is in effect
anything else -- the callable Python object used as a handler
[clinic start generated code]*/
static PyObject *
signal_getsignal_impl(PyObject *module, int signalnum)
/*[clinic end generated code: output=35b3e0e796fd555e input=ac23a00f19dfa509]*/
{
PyObject *old_handler;
if (signalnum < 1 || signalnum >= NSIG) {
PyErr_SetString(PyExc_ValueError,
"signal number out of range");
return NULL;
}
old_handler = Handlers[signalnum].func;
if (old_handler != NULL) {
Py_INCREF(old_handler);
return old_handler;
}
else {
Py_RETURN_NONE;
}
}
#ifdef HAVE_SIGINTERRUPT
/*[clinic input]
signal.siginterrupt
signalnum: int
flag: int
/
Change system call restart behaviour.
If flag is False, system calls will be restarted when interrupted by
signal sig, else system calls will be interrupted.
[clinic start generated code]*/
static PyObject *
signal_siginterrupt_impl(PyObject *module, int signalnum, int flag)
/*[clinic end generated code: output=063816243d85dd19 input=4160acacca3e2099]*/
{
if (signalnum < 1 || signalnum >= NSIG) {
PyErr_SetString(PyExc_ValueError,
"signal number out of range");
return NULL;
}
if (siginterrupt(signalnum, flag)<0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
Py_RETURN_NONE;
}
#endif
static PyObject*
signal_set_wakeup_fd(PyObject *self, PyObject *args)
{
struct _Py_stat_struct status;
#ifdef MS_WINDOWS
PyObject *fdobj;
SOCKET_T sockfd, old_sockfd;
int res;
int res_size = sizeof res;
PyObject *mod;
int is_socket;
if (!PyArg_ParseTuple(args, "O:set_wakeup_fd", &fdobj))
return NULL;
sockfd = PyLong_AsSocket_t(fdobj);
if (sockfd == (SOCKET_T)(-1) && PyErr_Occurred())
return NULL;
#else
int fd, old_fd;
if (!PyArg_ParseTuple(args, "i:set_wakeup_fd", &fd))
return NULL;
#endif
#ifdef WITH_THREAD
if (PyThread_get_thread_ident() != main_thread) {
PyErr_SetString(PyExc_ValueError,
"set_wakeup_fd only works in main thread");
return NULL;
}
#endif
#ifdef MS_WINDOWS
is_socket = 0;
if (sockfd != INVALID_FD) {
/* Import the _socket module to call WSAStartup() */
mod = PyImport_ImportModuleNoBlock("_socket");
if (mod == NULL)
return NULL;
Py_DECREF(mod);
/* test the socket */
if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR,
(char *)&res, &res_size) != 0) {
int fd, err;
err = WSAGetLastError();
if (err != WSAENOTSOCK) {
PyErr_SetExcFromWindowsErr(PyExc_OSError, err);
return NULL;
}
fd = (int)sockfd;
if ((SOCKET_T)fd != sockfd) {
PyErr_SetString(PyExc_ValueError, "invalid fd");
return NULL;
}
if (_Py_fstat(fd, &status) != 0)
return NULL;
/* on Windows, a file cannot be set to non-blocking mode */
}
else {
is_socket = 1;
/* Windows does not provide a function to test if a socket
is in non-blocking mode */
}
}
old_sockfd = wakeup.fd;
wakeup.fd = sockfd;
wakeup.use_send = is_socket;
if (old_sockfd != INVALID_FD)
return PyLong_FromSocket_t(old_sockfd);
else
return PyLong_FromLong(-1);
#else
if (fd != -1) {
int blocking;
if (_Py_fstat(fd, &status) != 0)
return NULL;
blocking = _Py_get_blocking(fd);
if (blocking < 0)
return NULL;
if (blocking) {
PyErr_Format(PyExc_ValueError,
"the fd %i must be in non-blocking mode",
fd);
return NULL;
}
}
old_fd = wakeup_fd;
wakeup_fd = fd;
return PyLong_FromLong(old_fd);
#endif
}
PyDoc_STRVAR(set_wakeup_fd_doc,
"set_wakeup_fd(fd) -> fd\n\
\n\
Sets the fd to be written to (with the signal number) when a signal\n\
comes in. A library can use this to wakeup select or poll.\n\
The previous fd or -1 is returned.\n\
\n\
The fd must be non-blocking.");
/* C API for the same, without all the error checking */
int
PySignal_SetWakeupFd(int fd)
{
int old_fd;
if (fd < 0)
fd = -1;
#ifdef MS_WINDOWS
old_fd = Py_SAFE_DOWNCAST(wakeup.fd, SOCKET_T, int);
wakeup.fd = fd;
#else
old_fd = wakeup_fd;
wakeup_fd = fd;
#endif
return old_fd;
}
#ifdef HAVE_SETITIMER
/*[clinic input]
signal.setitimer
which: int
seconds: double
interval: double = 0.0
/
Sets given itimer (one of ITIMER_REAL, ITIMER_VIRTUAL or ITIMER_PROF).
The timer will fire after value seconds and after that every interval seconds.
The itimer can be cleared by setting seconds to zero.
Returns old values as a tuple: (delay, interval).
[clinic start generated code]*/
static PyObject *
signal_setitimer_impl(PyObject *module, int which, double seconds,
double interval)
/*[clinic end generated code: output=6f51da0fe0787f2c input=0d27d417cfcbd51a]*/
{
struct itimerval new, old;
timeval_from_double(seconds, &new.it_value);
timeval_from_double(interval, &new.it_interval);
/* Let OS check "which" value */
if (setitimer(which, &new, &old) != 0) {
PyErr_SetFromErrno(ItimerError);
return NULL;
}
return itimer_retval(&old);
}
#endif
#ifdef HAVE_GETITIMER
/*[clinic input]
signal.getitimer
which: int
/
Returns current value of given itimer.
[clinic start generated code]*/
static PyObject *
signal_getitimer_impl(PyObject *module, int which)
/*[clinic end generated code: output=9e053175d517db40 input=f7d21d38f3490627]*/
{
struct itimerval old;
if (getitimer(which, &old) != 0) {
PyErr_SetFromErrno(ItimerError);
return NULL;
}
return itimer_retval(&old);
}
#endif
#if defined(PYPTHREAD_SIGMASK) || defined(HAVE_SIGWAIT) || \
defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT)
/* Convert an iterable to a sigset.
Return 0 on success, return -1 and raise an exception on error. */
static int
iterable_to_sigset(PyObject *iterable, sigset_t *mask)
{
int result = -1;
PyObject *iterator, *item;
long signum;
int err;
sigemptyset(mask);
iterator = PyObject_GetIter(iterable);
if (iterator == NULL)
goto error;
while (1)
{
item = PyIter_Next(iterator);
if (item == NULL) {
if (PyErr_Occurred())
goto error;
else
break;
}
signum = PyLong_AsLong(item);
Py_DECREF(item);
if (signum == -1 && PyErr_Occurred())
goto error;
if (0 < signum && signum < NSIG)
err = sigaddset(mask, (int)signum);
else
err = 1;
if (err) {
PyErr_Format(PyExc_ValueError,
"signal number %ld out of range", signum);
goto error;
}
}
result = 0;
error:
Py_XDECREF(iterator);
return result;
}
#endif
#if defined(PYPTHREAD_SIGMASK) || defined(HAVE_SIGPENDING)
static PyObject*
sigset_to_set(sigset_t mask)
{
PyObject *signum, *result;
int sig;
result = PySet_New(0);
if (result == NULL)
return NULL;
for (sig = 1; sig < NSIG; sig++) {
if (sigismember(&mask, sig) != 1)
continue;
/* Handle the case where it is a member by adding the signal to
the result list. Ignore the other cases because they mean the
signal isn't a member of the mask or the signal was invalid,
and an invalid signal must have been our fault in constructing
the loop boundaries. */
signum = PyLong_FromLong(sig);
if (signum == NULL) {
Py_DECREF(result);
return NULL;
}
if (PySet_Add(result, signum) == -1) {
Py_DECREF(signum);
Py_DECREF(result);
return NULL;
}
Py_DECREF(signum);
}
return result;
}
#endif
#ifdef PYPTHREAD_SIGMASK
/*[clinic input]
signal.pthread_sigmask
how: int
mask: object
/
Fetch and/or change the signal mask of the calling thread.
[clinic start generated code]*/
static PyObject *
signal_pthread_sigmask_impl(PyObject *module, int how, PyObject *mask)
/*[clinic end generated code: output=ff640fe092bc9181 input=f3b7d7a61b7b8283]*/
{
sigset_t newmask, previous;
int err;
if (iterable_to_sigset(mask, &newmask))
return NULL;
err = pthread_sigmask(how, &newmask, &previous);
if (err != 0) {
errno = err;
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
/* if signals was unblocked, signal handlers have been called */
if (PyErr_CheckSignals())
return NULL;
return sigset_to_set(previous);
}
#endif /* #ifdef PYPTHREAD_SIGMASK */
#ifdef HAVE_SIGPENDING
/*[clinic input]
signal.sigpending
Examine pending signals.
Returns a set of signal numbers that are pending for delivery to
the calling thread.
[clinic start generated code]*/
static PyObject *
signal_sigpending_impl(PyObject *module)
/*[clinic end generated code: output=53375ffe89325022 input=e0036c016f874e29]*/
{
int err;
sigset_t mask;
err = sigpending(&mask);
if (err)
return PyErr_SetFromErrno(PyExc_OSError);
return sigset_to_set(mask);
}
#endif /* #ifdef HAVE_SIGPENDING */
#ifdef HAVE_SIGWAIT
/*[clinic input]
signal.sigwait
sigset: object
/
Wait for a signal.
Suspend execution of the calling thread until the delivery of one of the
signals specified in the signal set sigset. The function accepts the signal
and returns the signal number.
[clinic start generated code]*/
static PyObject *
signal_sigwait(PyObject *module, PyObject *sigset)
/*[clinic end generated code: output=557173647424f6e4 input=11af2d82d83c2e94]*/
{
sigset_t set;
int err, signum;
if (iterable_to_sigset(sigset, &set))
return NULL;
Py_BEGIN_ALLOW_THREADS
err = sigwait(&set, &signum);
Py_END_ALLOW_THREADS
if (err) {
errno = err;
return PyErr_SetFromErrno(PyExc_OSError);
}
return PyLong_FromLong(signum);
}
#endif /* #ifdef HAVE_SIGWAIT */
#if defined(HAVE_SIGWAITINFO) || defined(HAVE_SIGTIMEDWAIT)
static int initialized;
static PyStructSequence_Field struct_siginfo_fields[] = {
{"si_signo", "signal number"},
{"si_code", "signal code"},
{"si_errno", "errno associated with this signal"},
{"si_pid", "sending process ID"},
{"si_uid", "real user ID of sending process"},
{"si_status", "exit value or signal"},
{"si_band", "band event for SIGPOLL"},
{0}
};
PyDoc_STRVAR(struct_siginfo__doc__,
"struct_siginfo: Result from sigwaitinfo or sigtimedwait.\n\n\
This object may be accessed either as a tuple of\n\
(si_signo, si_code, si_errno, si_pid, si_uid, si_status, si_band),\n\
or via the attributes si_signo, si_code, and so on.");
static PyStructSequence_Desc struct_siginfo_desc = {
"signal.struct_siginfo", /* name */
struct_siginfo__doc__, /* doc */
struct_siginfo_fields, /* fields */
7 /* n_in_sequence */
};
static PyTypeObject SiginfoType;
static PyObject *
fill_siginfo(siginfo_t *si)
{
PyObject *result = PyStructSequence_New(&SiginfoType);
if (!result)
return NULL;
PyStructSequence_SET_ITEM(result, 0, PyLong_FromLong((long)(si->si_signo)));
PyStructSequence_SET_ITEM(result, 1, PyLong_FromLong((long)(si->si_code)));
PyStructSequence_SET_ITEM(result, 2, PyLong_FromLong((long)(si->si_errno)));
PyStructSequence_SET_ITEM(result, 3, PyLong_FromPid(si->si_pid));
PyStructSequence_SET_ITEM(result, 4, _PyLong_FromUid(si->si_uid));
PyStructSequence_SET_ITEM(result, 5,
PyLong_FromLong((long)(si->si_status)));
PyStructSequence_SET_ITEM(result, 6, PyLong_FromLong(si->si_band));
if (PyErr_Occurred()) {
Py_DECREF(result);
return NULL;
}
return result;
}
#endif
#ifdef HAVE_SIGWAITINFO
/*[clinic input]
signal.sigwaitinfo
sigset: object
/
Wait synchronously until one of the signals in *sigset* is delivered.
Returns a struct_siginfo containing information about the signal.
[clinic start generated code]*/