/
signal.c
1155 lines (1049 loc) · 23 KB
/
signal.c
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.c -
$Author$
created at: Tue Dec 20 10:13:44 JST 1994
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby/ruby.h"
#include "vm_core.h"
#include <signal.h>
#include <stdio.h>
#include <errno.h>
#ifdef _WIN32
typedef LONG rb_atomic_t;
# define ATOMIC_TEST(var) InterlockedExchange(&(var), 0)
# define ATOMIC_SET(var, val) InterlockedExchange(&(var), (val))
# define ATOMIC_INC(var) InterlockedIncrement(&(var))
# define ATOMIC_DEC(var) InterlockedDecrement(&(var))
#else
typedef int rb_atomic_t;
# define ATOMIC_TEST(var) ((var) ? ((var) = 0, 1) : 0)
# define ATOMIC_SET(var, val) ((var) = (val))
# define ATOMIC_INC(var) (++(var))
# define ATOMIC_DEC(var) (--(var))
#endif
#ifdef __BEOS__
#undef SIGBUS
#endif
#if defined HAVE_SIGPROCMASK || defined HAVE_SIGSETMASK
#define USE_TRAP_MASK 1
#else
#define USE_TRAP_MASK 0
#endif
#ifndef NSIG
# define NSIG (_SIGMAX + 1) /* For QNX */
#endif
static const struct signals {
const char *signm;
int signo;
} siglist [] = {
{"EXIT", 0},
#ifdef SIGHUP
{"HUP", SIGHUP},
#endif
{"INT", SIGINT},
#ifdef SIGQUIT
{"QUIT", SIGQUIT},
#endif
#ifdef SIGILL
{"ILL", SIGILL},
#endif
#ifdef SIGTRAP
{"TRAP", SIGTRAP},
#endif
#ifdef SIGIOT
{"IOT", SIGIOT},
#endif
#ifdef SIGABRT
{"ABRT", SIGABRT},
#endif
#ifdef SIGEMT
{"EMT", SIGEMT},
#endif
#ifdef SIGFPE
{"FPE", SIGFPE},
#endif
#ifdef SIGKILL
{"KILL", SIGKILL},
#endif
#ifdef SIGBUS
{"BUS", SIGBUS},
#endif
#ifdef SIGSEGV
{"SEGV", SIGSEGV},
#endif
#ifdef SIGSYS
{"SYS", SIGSYS},
#endif
#ifdef SIGPIPE
{"PIPE", SIGPIPE},
#endif
#ifdef SIGALRM
{"ALRM", SIGALRM},
#endif
#ifdef SIGTERM
{"TERM", SIGTERM},
#endif
#ifdef SIGURG
{"URG", SIGURG},
#endif
#ifdef SIGSTOP
{"STOP", SIGSTOP},
#endif
#ifdef SIGTSTP
{"TSTP", SIGTSTP},
#endif
#ifdef SIGCONT
{"CONT", SIGCONT},
#endif
#ifdef SIGCHLD
{"CHLD", SIGCHLD},
#endif
#ifdef SIGCLD
{"CLD", SIGCLD},
#else
# ifdef SIGCHLD
{"CLD", SIGCHLD},
# endif
#endif
#ifdef SIGTTIN
{"TTIN", SIGTTIN},
#endif
#ifdef SIGTTOU
{"TTOU", SIGTTOU},
#endif
#ifdef SIGIO
{"IO", SIGIO},
#endif
#ifdef SIGXCPU
{"XCPU", SIGXCPU},
#endif
#ifdef SIGXFSZ
{"XFSZ", SIGXFSZ},
#endif
#ifdef SIGVTALRM
{"VTALRM", SIGVTALRM},
#endif
#ifdef SIGPROF
{"PROF", SIGPROF},
#endif
#ifdef SIGWINCH
{"WINCH", SIGWINCH},
#endif
#ifdef SIGUSR1
{"USR1", SIGUSR1},
#endif
#ifdef SIGUSR2
{"USR2", SIGUSR2},
#endif
#ifdef SIGLOST
{"LOST", SIGLOST},
#endif
#ifdef SIGMSG
{"MSG", SIGMSG},
#endif
#ifdef SIGPWR
{"PWR", SIGPWR},
#endif
#ifdef SIGPOLL
{"POLL", SIGPOLL},
#endif
#ifdef SIGDANGER
{"DANGER", SIGDANGER},
#endif
#ifdef SIGMIGRATE
{"MIGRATE", SIGMIGRATE},
#endif
#ifdef SIGPRE
{"PRE", SIGPRE},
#endif
#ifdef SIGGRANT
{"GRANT", SIGGRANT},
#endif
#ifdef SIGRETRACT
{"RETRACT", SIGRETRACT},
#endif
#ifdef SIGSOUND
{"SOUND", SIGSOUND},
#endif
#ifdef SIGINFO
{"INFO", SIGINFO},
#endif
{NULL, 0}
};
static int
signm2signo(const char *nm)
{
const struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++)
if (strcmp(sigs->signm, nm) == 0)
return sigs->signo;
return 0;
}
static const char*
signo2signm(int no)
{
const struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++)
if (sigs->signo == no)
return sigs->signm;
return 0;
}
const char *
ruby_signal_name(int no)
{
return signo2signm(no);
}
/*
* call-seq:
* SignalException.new(sig) => signal_exception
*
* Construct a new SignalException object. +sig+ should be a known
* signal name, or a signal number.
*/
static VALUE
esignal_init(int argc, VALUE *argv, VALUE self)
{
int argnum = 1;
VALUE sig = Qnil;
int signo;
const char *signm;
if (argc > 0) {
sig = rb_check_to_integer(argv[0], "to_int");
if (!NIL_P(sig)) argnum = 2;
else sig = argv[0];
}
if (argc < 1 || argnum < argc) {
rb_raise(rb_eArgError, "wrong number of arguments (%d for %d)",
argc, argnum);
}
if (argnum == 2) {
signo = NUM2INT(sig);
if (signo < 0 || signo > NSIG) {
rb_raise(rb_eArgError, "invalid signal number (%d)", signo);
}
if (argc > 1) {
sig = argv[1];
}
else {
signm = signo2signm(signo);
if (signm) {
sig = rb_sprintf("SIG%s", signm);
}
else {
sig = rb_sprintf("SIG%u", signo);
}
}
}
else {
signm = SYMBOL_P(sig) ? rb_id2name(SYM2ID(sig)) : StringValuePtr(sig);
if (strncmp(signm, "SIG", 3) == 0) signm += 3;
signo = signm2signo(signm);
if (!signo) {
rb_raise(rb_eArgError, "unsupported name `SIG%s'", signm);
}
sig = rb_sprintf("SIG%s", signm);
}
rb_call_super(1, &sig);
rb_iv_set(self, "signo", INT2NUM(signo));
return self;
}
/*
* call-seq:
* signal_exception.signo => num
*
* Returns a signal number.
*/
static VALUE
esignal_signo(VALUE self)
{
return rb_iv_get(self, "signo");
}
static VALUE
interrupt_init(int argc, VALUE *argv, VALUE self)
{
VALUE args[2];
args[0] = INT2FIX(SIGINT);
rb_scan_args(argc, argv, "01", &args[1]);
return rb_call_super(2, args);
}
void
ruby_default_signal(int sig)
{
signal(sig, SIG_DFL);
raise(sig);
}
/*
* call-seq:
* Process.kill(signal, pid, ...) => fixnum
*
* Sends the given signal to the specified process id(s), or to the
* current process if _pid_ is zero. _signal_ may be an
* integer signal number or a POSIX signal name (either with or without
* a +SIG+ prefix). If _signal_ is negative (or starts
* with a minus sign), kills process groups instead of
* processes. Not all signals are available on all platforms.
*
* pid = fork do
* Signal.trap("HUP") { puts "Ouch!"; exit }
* # ... do some work ...
* end
* # ...
* Process.kill("HUP", pid)
* Process.wait
*
* <em>produces:</em>
*
* Ouch!
*/
VALUE
rb_f_kill(int argc, VALUE *argv)
{
#ifndef HAS_KILLPG
#define killpg(pg, sig) kill(-(pg), sig)
#endif
int negative = 0;
int sig;
int i;
const char *s;
rb_secure(2);
if (argc < 2)
rb_raise(rb_eArgError, "wrong number of arguments -- kill(sig, pid...)");
switch (TYPE(argv[0])) {
case T_FIXNUM:
sig = FIX2INT(argv[0]);
break;
case T_SYMBOL:
s = rb_id2name(SYM2ID(argv[0]));
if (!s) rb_raise(rb_eArgError, "bad signal");
goto str_signal;
case T_STRING:
s = RSTRING_PTR(argv[0]);
if (s[0] == '-') {
negative++;
s++;
}
str_signal:
if (strncmp("SIG", s, 3) == 0)
s += 3;
if((sig = signm2signo(s)) == 0)
rb_raise(rb_eArgError, "unsupported name `SIG%s'", s);
if (negative)
sig = -sig;
break;
default:
{
VALUE str;
str = rb_check_string_type(argv[0]);
if (!NIL_P(str)) {
s = RSTRING_PTR(str);
goto str_signal;
}
rb_raise(rb_eArgError, "bad signal type %s",
rb_obj_classname(argv[0]));
}
break;
}
if (sig < 0) {
sig = -sig;
for (i=1; i<argc; i++) {
if (killpg(NUM2PIDT(argv[i]), sig) < 0)
rb_sys_fail(0);
}
}
else {
for (i=1; i<argc; i++) {
if (kill(NUM2PIDT(argv[i]), sig) < 0)
rb_sys_fail(0);
}
}
rb_thread_polling();
return INT2FIX(i-1);
}
static struct {
rb_atomic_t cnt[RUBY_NSIG];
rb_atomic_t size;
} signal_buff;
#ifdef __dietlibc__
#define sighandler_t sh_t
#endif
typedef RETSIGTYPE (*sighandler_t)(int);
#if defined SA_SIGINFO && !defined __SYMBIAN32__
typedef void ruby_sigaction_t(int, siginfo_t*, void*);
#define SIGINFO_ARG , siginfo_t *info, void *ctx
#else
typedef RETSIGTYPE ruby_sigaction_t(int);
#define SIGINFO_ARG
#endif
#ifdef POSIX_SIGNAL
#if defined(SIGSEGV) && defined(HAVE_SIGALTSTACK)
#define USE_SIGALTSTACK
#endif
#ifdef USE_SIGALTSTACK
#ifdef SIGSTKSZ
#define ALT_STACK_SIZE (SIGSTKSZ*2)
#else
#define ALT_STACK_SIZE (4*1024)
#endif
/* alternate stack for SIGSEGV */
static void
register_sigaltstack(void)
{
static void *altstack = 0;
stack_t newSS, oldSS;
if (altstack) return;
newSS.ss_sp = altstack = malloc(ALT_STACK_SIZE);
if (newSS.ss_sp == NULL)
/* should handle error */
rb_bug("register_sigaltstack. malloc error\n");
newSS.ss_size = ALT_STACK_SIZE;
newSS.ss_flags = 0;
sigaltstack(&newSS, &oldSS); /* ignore error. */
}
#endif
static sighandler_t
ruby_signal(int signum, sighandler_t handler)
{
struct sigaction sigact, old;
#if 0
rb_trap_accept_nativethreads[signum] = 0;
#endif
sigemptyset(&sigact.sa_mask);
#ifdef SA_SIGINFO
sigact.sa_sigaction = (ruby_sigaction_t*)handler;
sigact.sa_flags = SA_SIGINFO;
#else
sigact.sa_handler = handler;
sigact.sa_flags = 0;
#endif
#ifdef SA_NOCLDWAIT
if (signum == SIGCHLD && handler == SIG_IGN)
sigact.sa_flags |= SA_NOCLDWAIT;
#endif
#if defined(SA_ONSTACK) && defined(USE_SIGALTSTACK)
if (signum == SIGSEGV)
sigact.sa_flags |= SA_ONSTACK;
#endif
if (sigaction(signum, &sigact, &old) < 0) {
if (errno != 0 && errno != EINVAL) {
rb_bug("sigaction error.\n");
}
}
return old.sa_handler;
}
sighandler_t
posix_signal(int signum, sighandler_t handler)
{
return ruby_signal(signum, handler);
}
#else /* !POSIX_SIGNAL */
#define ruby_signal(sig,handler) (/* rb_trap_accept_nativethreads[sig] = 0,*/ signal((sig),(handler)))
#if 0 /* def HAVE_NATIVETHREAD */
static sighandler_t
ruby_nativethread_signal(int signum, sighandler_t handler)
{
sighandler_t old;
old = signal(signum, handler);
rb_trap_accept_nativethreads[signum] = 1;
return old;
}
#endif
#endif
static RETSIGTYPE
sighandler(int sig)
{
ATOMIC_INC(signal_buff.cnt[sig]);
ATOMIC_INC(signal_buff.size);
#if !defined(BSD_SIGNAL) && !defined(POSIX_SIGNAL)
ruby_signal(sig, sighandler);
#endif
}
int
rb_signal_buff_size(void)
{
return signal_buff.size;
}
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
static sigset_t trap_last_mask;
# else
static int trap_last_mask;
# endif
#endif
#if HAVE_PTHREAD_H
#include <pthread.h>
#endif
void
rb_disable_interrupt(void)
{
#if USE_TRAP_MASK
sigset_t mask;
sigfillset(&mask);
sigdelset(&mask, SIGVTALRM);
sigdelset(&mask, SIGSEGV);
pthread_sigmask(SIG_SETMASK, &mask, NULL);
#endif
}
void
rb_enable_interrupt(void)
{
#if USE_TRAP_MASK
sigset_t mask;
sigemptyset(&mask);
pthread_sigmask(SIG_SETMASK, &mask, NULL);
#endif
}
int
rb_get_next_signal(void)
{
int i, sig = 0;
for (i=1; i<RUBY_NSIG; i++) {
if (signal_buff.cnt[i] > 0) {
rb_disable_interrupt();
{
ATOMIC_DEC(signal_buff.cnt[i]);
ATOMIC_DEC(signal_buff.size);
}
rb_enable_interrupt();
sig = i;
break;
}
}
return sig;
}
#ifdef SIGBUS
static RETSIGTYPE
sigbus(int sig)
{
rb_bug("Bus Error");
}
#endif
#ifdef SIGSEGV
static int segv_received = 0;
static RETSIGTYPE
sigsegv(int sig SIGINFO_ARG)
{
#ifdef USE_SIGALTSTACK
int ruby_stack_overflowed_p(const rb_thread_t *, const void *);
NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
rb_thread_t *th = GET_THREAD();
if (ruby_stack_overflowed_p(th, info->si_addr)) {
ruby_thread_stack_overflow(th);
}
#endif
if (segv_received) {
fprintf(stderr, "SEGV recieved in SEGV handler\n");
exit(EXIT_FAILURE);
}
else {
extern int ruby_disable_gc_stress;
segv_received = 1;
ruby_disable_gc_stress = 1;
rb_bug("Segmentation fault");
}
}
#endif
#ifdef SIGPIPE
static RETSIGTYPE
sigpipe(int sig)
{
/* do nothing */
}
#endif
static void
signal_exec(VALUE cmd, int safe, int sig)
{
VALUE signum = INT2NUM(sig);
rb_eval_cmd(cmd, rb_ary_new3(1, signum), safe);
}
void
rb_trap_exit(void)
{
rb_vm_t *vm = GET_VM();
VALUE trap_exit = vm->trap_list[0].cmd;
if (trap_exit) {
vm->trap_list[0].cmd = 0;
signal_exec(trap_exit, vm->trap_list[0].safe, 0);
}
}
void
rb_signal_exec(rb_thread_t *th, int sig)
{
rb_vm_t *vm = GET_VM();
VALUE cmd = vm->trap_list[sig].cmd;
int safe = vm->trap_list[sig].safe;
if (cmd == 0) {
switch (sig) {
case SIGINT:
rb_interrupt();
break;
#ifdef SIGHUP
case SIGHUP:
#endif
#ifdef SIGQUIT
case SIGQUIT:
#endif
#ifdef SIGTERM
case SIGTERM:
#endif
#ifdef SIGALRM
case SIGALRM:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
#ifdef SIGUSR2
case SIGUSR2:
#endif
rb_threadptr_signal_raise(th, sig);
break;
}
}
else if (cmd == Qundef) {
rb_threadptr_signal_exit(th);
}
else {
signal_exec(cmd, safe, sig);
}
}
struct trap_arg {
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
sigset_t mask;
# else
int mask;
# endif
#endif
int sig;
sighandler_t func;
VALUE cmd;
};
static sighandler_t
default_handler(int sig)
{
sighandler_t func;
switch (sig) {
case SIGINT:
#ifdef SIGHUP
case SIGHUP:
#endif
#ifdef SIGQUIT
case SIGQUIT:
#endif
#ifdef SIGTERM
case SIGTERM:
#endif
#ifdef SIGALRM
case SIGALRM:
#endif
#ifdef SIGUSR1
case SIGUSR1:
#endif
#ifdef SIGUSR2
case SIGUSR2:
#endif
func = sighandler;
break;
#ifdef SIGBUS
case SIGBUS:
func = sigbus;
break;
#endif
#ifdef SIGSEGV
case SIGSEGV:
func = (sighandler_t)sigsegv;
# ifdef USE_SIGALTSTACK
register_sigaltstack();
# endif
break;
#endif
#ifdef SIGPIPE
case SIGPIPE:
func = sigpipe;
break;
#endif
default:
func = SIG_DFL;
break;
}
return func;
}
static sighandler_t
trap_handler(VALUE *cmd, int sig)
{
sighandler_t func = sighandler;
VALUE command;
if (NIL_P(*cmd)) {
func = SIG_IGN;
}
else {
command = rb_check_string_type(*cmd);
if (NIL_P(command) && SYMBOL_P(*cmd)) {
command = rb_id2str(SYM2ID(*cmd));
if (!command) rb_raise(rb_eArgError, "bad handler");
}
if (!NIL_P(command)) {
SafeStringValue(command); /* taint check */
*cmd = command;
switch (RSTRING_LEN(command)) {
case 0:
goto sig_ign;
break;
case 14:
if (strncmp(RSTRING_PTR(command), "SYSTEM_DEFAULT", 14) == 0) {
func = SIG_DFL;
*cmd = 0;
}
break;
case 7:
if (strncmp(RSTRING_PTR(command), "SIG_IGN", 7) == 0) {
sig_ign:
func = SIG_IGN;
*cmd = 0;
}
else if (strncmp(RSTRING_PTR(command), "SIG_DFL", 7) == 0) {
sig_dfl:
func = default_handler(sig);
*cmd = 0;
}
else if (strncmp(RSTRING_PTR(command), "DEFAULT", 7) == 0) {
goto sig_dfl;
}
break;
case 6:
if (strncmp(RSTRING_PTR(command), "IGNORE", 6) == 0) {
goto sig_ign;
}
break;
case 4:
if (strncmp(RSTRING_PTR(command), "EXIT", 4) == 0) {
*cmd = Qundef;
}
break;
}
}
else {
rb_proc_t *proc;
GetProcPtr(*cmd, proc);
}
}
return func;
}
static int
trap_signm(VALUE vsig)
{
int sig = -1;
const char *s;
switch (TYPE(vsig)) {
case T_FIXNUM:
sig = FIX2INT(vsig);
if (sig < 0 || sig >= NSIG) {
rb_raise(rb_eArgError, "invalid signal number (%d)", sig);
}
break;
case T_SYMBOL:
s = rb_id2name(SYM2ID(vsig));
if (!s) rb_raise(rb_eArgError, "bad signal");
goto str_signal;
default:
s = StringValuePtr(vsig);
str_signal:
if (strncmp("SIG", s, 3) == 0)
s += 3;
sig = signm2signo(s);
if (sig == 0 && strcmp(s, "EXIT") != 0)
rb_raise(rb_eArgError, "unsupported signal SIG%s", s);
}
return sig;
}
static VALUE
trap(struct trap_arg *arg)
{
sighandler_t oldfunc, func = arg->func;
VALUE oldcmd, command = arg->cmd;
int sig = arg->sig;
rb_vm_t *vm = GET_VM();
oldfunc = ruby_signal(sig, func);
oldcmd = vm->trap_list[sig].cmd;
switch (oldcmd) {
case 0:
if (oldfunc == SIG_IGN) oldcmd = rb_str_new2("IGNORE");
else if (oldfunc == sighandler) oldcmd = rb_str_new2("DEFAULT");
else oldcmd = Qnil;
break;
case Qundef:
oldcmd = rb_str_new2("EXIT");
break;
}
vm->trap_list[sig].cmd = command;
vm->trap_list[sig].safe = rb_safe_level();
/* enable at least specified signal. */
#if USE_TRAP_MASK
#ifdef HAVE_SIGPROCMASK
sigdelset(&arg->mask, sig);
#else
arg->mask &= ~sigmask(sig);
#endif
#endif
return oldcmd;
}
#if USE_TRAP_MASK
static VALUE
trap_ensure(struct trap_arg *arg)
{
/* enable interrupt */
#ifdef HAVE_SIGPROCMASK
sigprocmask(SIG_SETMASK, &arg->mask, NULL);
#else
sigsetmask(arg->mask);
#endif
trap_last_mask = arg->mask;
return 0;
}
#endif
void
rb_trap_restore_mask(void)
{
#if USE_TRAP_MASK
# ifdef HAVE_SIGPROCMASK
sigprocmask(SIG_SETMASK, &trap_last_mask, NULL);
# else
sigsetmask(trap_last_mask);
# endif
#endif
}
/*
* call-seq:
* Signal.trap( signal, command ) => obj
* Signal.trap( signal ) {| | block } => obj
*
* Specifies the handling of signals. The first parameter is a signal
* name (a string such as ``SIGALRM'', ``SIGUSR1'', and so on) or a
* signal number. The characters ``SIG'' may be omitted from the
* signal name. The command or block specifies code to be run when the
* signal is raised.
* If the command is the string ``IGNORE'' or ``SIG_IGN'', the signal
* will be ignored.
* If the command is ``DEFAULT'' or ``SIG_DFL'', the Ruby's default handler
* will be invoked.
* If the command is ``EXIT'', the script will be terminated by the signal.
* If the command is ``SYSTEM_DEFAULT'', the operating system's default
* handler will be invoked.
* Otherwise, the given command or block will be run.
* The special signal name ``EXIT'' or signal number zero will be
* invoked just prior to program termination.
* trap returns the previous handler for the given signal.
*
* Signal.trap(0, proc { puts "Terminating: #{$$}" })
* Signal.trap("CLD") { puts "Child died" }
* fork && Process.wait
*
* produces:
* Terminating: 27461
* Child died
* Terminating: 27460
*/
static VALUE
sig_trap(int argc, VALUE *argv)
{
struct trap_arg arg;
rb_secure(2);
if (argc < 1 || argc > 2) {
rb_raise(rb_eArgError, "wrong number of arguments -- trap(sig, cmd)/trap(sig){...}");
}
arg.sig = trap_signm(argv[0]);
if (argc == 1) {
arg.cmd = rb_block_proc();
arg.func = sighandler;
}
else {
arg.cmd = argv[1];
arg.func = trap_handler(&arg.cmd, arg.sig);
}
if (OBJ_TAINTED(arg.cmd)) {
rb_raise(rb_eSecurityError, "Insecure: tainted signal trap");
}
#if USE_TRAP_MASK
/* disable interrupt */
# ifdef HAVE_SIGPROCMASK
sigfillset(&arg.mask);
sigprocmask(SIG_BLOCK, &arg.mask, &arg.mask);
# else
arg.mask = sigblock(~0);
# endif
return rb_ensure(trap, (VALUE)&arg, trap_ensure, (VALUE)&arg);
#else
return trap(&arg);
#endif
}
/*
* call-seq:
* Signal.list => a_hash
*
* Returns a list of signal names mapped to the corresponding
* underlying signal numbers.
*
* Signal.list #=> {"EXIT"=>0, "HUP"=>1, "INT"=>2, "QUIT"=>3, "ILL"=>4, "TRAP"=>5, "IOT"=>6, "ABRT"=>6, "FPE"=>8, "KILL"=>9, "BUS"=>7, "SEGV"=>11, "SYS"=>31, "PIPE"=>13, "ALRM"=>14, "TERM"=>15, "URG"=>23, "STOP"=>19, "TSTP"=>20, "CONT"=>18, "CHLD"=>17, "CLD"=>17, "TTIN"=>21, "TTOU"=>22, "IO"=>29, "XCPU"=>24, "XFSZ"=>25, "VTALRM"=>26, "PROF"=>27, "WINCH"=>28, "USR1"=>10, "USR2"=>12, "PWR"=>30, "POLL"=>29}
*/
static VALUE
sig_list(void)
{
VALUE h = rb_hash_new();
const struct signals *sigs;
for (sigs = siglist; sigs->signm; sigs++) {
rb_hash_aset(h, rb_str_new2(sigs->signm), INT2FIX(sigs->signo));
}
return h;
}
static void
install_sighandler(int signum, sighandler_t handler)
{
sighandler_t old;
old = ruby_signal(signum, handler);
if (old != SIG_DFL) {
ruby_signal(signum, old);
}
}