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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20
21"Magic" is special data attached to SV structures in order to give them
22"magical" properties. When any Perl code tries to read from, or assign to,
23an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 24with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 25give it a chance to update its internal value (get on $. writes the line
b53c43bf 26number of the last read filehandle into the SV's IV slot), while
166f8a29 27set is called after an SV has been written to, in order to allow it to make
ddfa107c 28use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
29PL_rs global variable).
30
31Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 33of functions that implement the get(), set(), length() etc functions,
154e47c8 34plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
35a MAGIC structure that contains a pointer to the object associated with the
36tie.
37
ccfc67b7
JH
38*/
39
79072805 40#include "EXTERN.h"
864dbfa3 41#define PERL_IN_MG_C
79072805
LW
42#include "perl.h"
43
5cd24f17 44#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
45# ifdef I_GRP
46# include <grp.h>
47# endif
188ea221
CS
48#endif
49
757f63d8
SP
50#if defined(HAS_SETGROUPS)
51# ifndef NGROUPS
52# define NGROUPS 32
53# endif
54#endif
55
17aa7f3d
JH
56#ifdef __hpux
57# include <sys/pstat.h>
58#endif
59
7636ea95
AB
60#ifdef HAS_PRCTL_SET_NAME
61# include <sys/prctl.h>
62#endif
63
8aad04aa 64#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 65Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 66#else
e69880a5 67Signal_t Perl_csighandler(int sig);
8aad04aa 68#endif
e69880a5 69
9cffb111
OS
70#ifdef __Lynx__
71/* Missing protos on LynxOS */
72void setruid(uid_t id);
73void seteuid(uid_t id);
74void setrgid(uid_t id);
75void setegid(uid_t id);
76#endif
77
c07a80fd 78/*
4bac9ae4 79 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
80 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
81 */
82
83struct magic_state {
84 SV* mgs_sv;
455ece5e 85 I32 mgs_ss_ix;
f9c6fee5
CS
86 U32 mgs_magical;
87 bool mgs_readonly;
150b625d 88 bool mgs_bumped;
c07a80fd 89};
455ece5e 90/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
91
92STATIC void
ff44333e 93S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
c07a80fd 94{
97aff369 95 dVAR;
455ece5e 96 MGS* mgs;
150b625d 97 bool bumped = FALSE;
7918f24d 98
ff44333e 99 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 100
4bac9ae4
CS
101 assert(SvMAGICAL(sv));
102
150b625d
DM
103 /* we shouldn't really be called here with RC==0, but it can sometimes
104 * happen via mg_clear() (which also shouldn't be called when RC==0,
105 * but it can happen). Handle this case gracefully(ish) by not RC++
106 * and thus avoiding the resultant double free */
107 if (SvREFCNT(sv) > 0) {
108 /* guard against sv getting freed midway through the mg clearing,
109 * by holding a private reference for the duration. */
110 SvREFCNT_inc_simple_void_NN(sv);
111 bumped = TRUE;
112 }
8985fe98 113
8772537c 114 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
115
116 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 117 mgs->mgs_sv = sv;
f9c6fee5 118 mgs->mgs_magical = SvMAGICAL(sv);
46959f1c 119 mgs->mgs_readonly = SvREADONLY(sv) != 0;
455ece5e 120 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 121 mgs->mgs_bumped = bumped;
c07a80fd 122
ff44333e 123 SvFLAGS(sv) &= ~flags;
3805b5fb 124 SvREADONLY_off(sv);
c07a80fd
PP
125}
126
ff44333e
FC
127#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
128
954c1994
GS
129/*
130=for apidoc mg_magical
131
132Turns on the magical status of an SV. See C<sv_magic>.
133
134=cut
135*/
136
8990e307 137void
864dbfa3 138Perl_mg_magical(pTHX_ SV *sv)
8990e307 139{
e1ec3a88 140 const MAGIC* mg;
7918f24d 141 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 142 PERL_UNUSED_CONTEXT;
f9c6fee5
CS
143
144 SvMAGICAL_off(sv);
218787bd 145 if ((mg = SvMAGIC(sv))) {
218787bd
VP
146 do {
147 const MGVTBL* const vtbl = mg->mg_virtual;
148 if (vtbl) {
149 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
150 SvGMAGICAL_on(sv);
151 if (vtbl->svt_set)
152 SvSMAGICAL_on(sv);
153 if (vtbl->svt_clear)
154 SvRMAGICAL_on(sv);
155 }
156 } while ((mg = mg->mg_moremagic));
157 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
158 SvRMAGICAL_on(sv);
8990e307
LW
159 }
160}
161
954c1994
GS
162/*
163=for apidoc mg_get
164
4b1e7f06 165Do magic before a value is retrieved from the SV. The type of SV must
72d33970 166be >= SVt_PVMG. See C<sv_magic>.
954c1994
GS
167
168=cut
169*/
170
79072805 171int
864dbfa3 172Perl_mg_get(pTHX_ SV *sv)
79072805 173{
97aff369 174 dVAR;
35a4481c 175 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 176 bool saved = FALSE;
f9c6fee5 177 bool have_new = 0;
ff76feab 178 MAGIC *newmg, *head, *cur, *mg;
6683b158 179
7918f24d
NC
180 PERL_ARGS_ASSERT_MG_GET;
181
407287f9
FC
182 if (PL_localizing == 1 && sv == DEFSV) return 0;
183
ff76feab
AMS
184 /* We must call svt_get(sv, mg) for each valid entry in the linked
185 list of magic. svt_get() may delete the current entry, add new
186 magic to the head of the list, or upgrade the SV. AMS 20010810 */
187
188 newmg = cur = head = mg = SvMAGIC(sv);
189 while (mg) {
35a4481c 190 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 191 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 192
2b260de0 193 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
194
195 /* taint's mg get is so dumb it doesn't need flag saving */
196 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
197 save_magic(mgs_ix, sv);
198 saved = TRUE;
199 }
200
16c91539 201 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 202
58f82c5c
DM
203 /* guard against magic having been deleted - eg FETCH calling
204 * untie */
f9c6fee5
CS
205 if (!SvMAGIC(sv)) {
206 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
58f82c5c 207 break;
f9c6fee5 208 }
b77f7d40 209
f9c6fee5 210 /* recalculate flags if this entry was deleted. */
ff76feab 211 if (mg->mg_flags & MGf_GSKIP)
f9c6fee5 212 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
a0d0e21e 213 }
7d1328bb
FC
214 else if (vtbl == &PL_vtbl_utf8) {
215 /* get-magic can reallocate the PV */
216 magic_setutf8(sv, mg);
217 }
ff76feab 218
f9c6fee5 219 mg = nextmg;
ff76feab 220
0723351e 221 if (have_new) {
ff76feab
AMS
222 /* Have we finished with the new entries we saw? Start again
223 where we left off (unless there are more new entries). */
224 if (mg == head) {
0723351e 225 have_new = 0;
ff76feab
AMS
226 mg = cur;
227 head = newmg;
228 }
229 }
230
231 /* Were any new entries added? */
0723351e
NC
232 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
233 have_new = 1;
ff76feab
AMS
234 cur = mg;
235 mg = newmg;
f9c6fee5 236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
760ac839 237 }
79072805 238 }
463ee0b2 239
a9844598
CS
240 if (saved)
241 restore_magic(INT2PTR(void *, (IV)mgs_ix));
242
79072805
LW
243 return 0;
244}
245
954c1994
GS
246/*
247=for apidoc mg_set
248
249Do magic after a value is assigned to the SV. See C<sv_magic>.
250
251=cut
252*/
253
79072805 254int
864dbfa3 255Perl_mg_set(pTHX_ SV *sv)
79072805 256{
97aff369 257 dVAR;
35a4481c 258 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 259 MAGIC* mg;
463ee0b2
LW
260 MAGIC* nextmg;
261
7918f24d
NC
262 PERL_ARGS_ASSERT_MG_SET;
263
b5ed8c44
FC
264 if (PL_localizing == 2 && sv == DEFSV) return 0;
265
ff44333e 266 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
267
268 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 269 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 270 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
271 if (mg->mg_flags & MGf_GSKIP) {
272 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
f9c6fee5 273 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
a0d0e21e 274 }
e0a73de4 275 if (PL_localizing == 2
b5ed8c44 276 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 277 continue;
2b260de0 278 if (vtbl && vtbl->svt_set)
16c91539 279 vtbl->svt_set(aTHX_ sv, mg);
79072805 280 }
463ee0b2 281
8772537c 282 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
283 return 0;
284}
285
954c1994
GS
286/*
287=for apidoc mg_length
288
d4e99c76 289Reports on the SV's length in bytes, calling length magic if available,
bd8446cf
FC
290but does not set the UTF8 flag on the sv. It will fall back to 'get'
291magic if there is no 'length' magic, but with no indication as to
292whether it called 'get' magic. It assumes the sv is a PVMG or
293higher. Use sv_len() instead.
954c1994
GS
294
295=cut
296*/
297
79072805 298U32
864dbfa3 299Perl_mg_length(pTHX_ SV *sv)
79072805 300{
97aff369 301 dVAR;
79072805 302 MAGIC* mg;
463ee0b2 303 STRLEN len;
463ee0b2 304
7918f24d
NC
305 PERL_ARGS_ASSERT_MG_LENGTH;
306
79072805 307 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 308 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 309 if (vtbl && vtbl->svt_len) {
35a4481c 310 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 311 save_magic(mgs_ix, sv);
a0d0e21e 312 /* omit MGf_GSKIP -- not changed here */
16c91539 313 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 314 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
315 return len;
316 }
317 }
318
bd8446cf 319 (void)SvPV_const(sv, len);
463ee0b2 320 return len;
79072805
LW
321}
322
8fb26106 323I32
864dbfa3 324Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
325{
326 MAGIC* mg;
ac27b0f5 327
7918f24d
NC
328 PERL_ARGS_ASSERT_MG_SIZE;
329
93965878 330 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 331 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 332 if (vtbl && vtbl->svt_len) {
35a4481c
AL
333 const I32 mgs_ix = SSNEW(sizeof(MGS));
334 I32 len;
455ece5e 335 save_magic(mgs_ix, sv);
93965878 336 /* omit MGf_GSKIP -- not changed here */
16c91539 337 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 338 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
339 return len;
340 }
341 }
342
343 switch(SvTYPE(sv)) {
344 case SVt_PVAV:
502c6561 345 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
346 case SVt_PVHV:
347 /* FIXME */
348 default:
cea2e8a9 349 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS
350 break;
351 }
352 return 0;
353}
354
954c1994
GS
355/*
356=for apidoc mg_clear
357
358Clear something magical that the SV represents. See C<sv_magic>.
359
360=cut
361*/
362
79072805 363int
864dbfa3 364Perl_mg_clear(pTHX_ SV *sv)
79072805 365{
35a4481c 366 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 367 MAGIC* mg;
8ac77ac9 368 MAGIC *nextmg;
463ee0b2 369
7918f24d
NC
370 PERL_ARGS_ASSERT_MG_CLEAR;
371
455ece5e 372 save_magic(mgs_ix, sv);
463ee0b2 373
8ac77ac9 374 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 375 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 376 /* omit GSKIP -- never set here */
727405f8 377
8ac77ac9
NC
378 nextmg = mg->mg_moremagic; /* it may delete itself */
379
2b260de0 380 if (vtbl && vtbl->svt_clear)
16c91539 381 vtbl->svt_clear(aTHX_ sv, mg);
79072805 382 }
463ee0b2 383
8772537c 384 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
385 return 0;
386}
387
ed624ca8 388static MAGIC*
39de7f53
FR
389S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
390{
391 PERL_UNUSED_CONTEXT;
392
393 assert(flags <= 1);
394
395 if (sv) {
396 MAGIC *mg;
397
7db6405c
FC
398 assert(!(SvTYPE(sv) == SVt_PVAV && AvPAD_NAMELIST(sv)));
399
39de7f53
FR
400 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
401 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
402 return mg;
403 }
404 }
405 }
406
407 return NULL;
408}
409
954c1994
GS
410/*
411=for apidoc mg_find
412
413Finds the magic pointer for type matching the SV. See C<sv_magic>.
414
415=cut
416*/
417
93a17b20 418MAGIC*
35a4481c 419Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 420{
39de7f53
FR
421 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
422}
423
424/*
425=for apidoc mg_findext
426
427Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
428C<sv_magicext>.
429
430=cut
431*/
432
433MAGIC*
434Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
435{
436 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
93a17b20
LW
437}
438
96c2a8ff
FC
439MAGIC *
440Perl_mg_find_mglob(pTHX_ SV *sv)
441{
442 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
443 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
444 /* This sv is only a delegate. //g magic must be attached to
445 its target. */
446 vivify_defelem(sv);
447 sv = LvTARG(sv);
448 }
449 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
450 return S_mg_findext_flags(aTHX_ sv, PERL_MAGIC_regex_global, 0, 0);
451 return NULL;
452}
453
954c1994
GS
454/*
455=for apidoc mg_copy
456
457Copies the magic from one SV to another. See C<sv_magic>.
458
459=cut
460*/
461
79072805 462int
864dbfa3 463Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 464{
463ee0b2 465 int count = 0;
79072805 466 MAGIC* mg;
7918f24d
NC
467
468 PERL_ARGS_ASSERT_MG_COPY;
469
463ee0b2 470 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 471 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 472 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 473 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 474 }
823a54a3
AL
475 else {
476 const char type = mg->mg_type;
1e73acc8 477 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
478 sv_magic(nsv,
479 (type == PERL_MAGIC_tied)
480 ? SvTIED_obj(sv, mg)
481 : (type == PERL_MAGIC_regdata && mg->mg_obj)
482 ? sv
483 : mg->mg_obj,
484 toLOWER(type), key, klen);
485 count++;
486 }
79072805 487 }
79072805 488 }
463ee0b2 489 return count;
79072805
LW
490}
491
954c1994 492/*
0cbee0a4
DM
493=for apidoc mg_localize
494
9711599e 495Copy some of the magic from an existing SV to new localized version of that
154e47c8
FC
496SV. Container magic (eg %ENV, $1, tie)
497gets copied, value magic doesn't (eg
9711599e
CS
498taint, pos).
499
af7df257 500If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
501This typically means that assignment will soon follow (e.g. 'local $x = $y'),
502and that will handle the magic.
0cbee0a4
DM
503
504=cut
505*/
506
507void
af7df257 508Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 509{
97aff369 510 dVAR;
0cbee0a4 511 MAGIC *mg;
7918f24d
NC
512
513 PERL_ARGS_ASSERT_MG_LOCALIZE;
514
658a9f31
JD
515 if (nsv == DEFSV)
516 return;
517
0cbee0a4 518 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 519 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 520 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 521 continue;
0cbee0a4 522
a5063e7c 523 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 524 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 525 else
0cbee0a4
DM
526 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
527 mg->mg_ptr, mg->mg_len);
a5063e7c 528
0cbee0a4 529 /* container types should remain read-only across localization */
9ff3e6d8 530 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
531 }
532
533 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
534 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 535 if (setmagic) {
9711599e
CS
536 PL_localizing = 1;
537 SvSETMAGIC(nsv);
538 PL_localizing = 0;
539 }
0cbee0a4
DM
540 }
541}
542
d9088386
Z
543#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
544static void
545S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
546{
547 const MGVTBL* const vtbl = mg->mg_virtual;
548 if (vtbl && vtbl->svt_free)
549 vtbl->svt_free(aTHX_ sv, mg);
550 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
551 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
552 Safefree(mg->mg_ptr);
553 else if (mg->mg_len == HEf_SVKEY)
554 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
555 }
556 if (mg->mg_flags & MGf_REFCOUNTED)
557 SvREFCNT_dec(mg->mg_obj);
558 Safefree(mg);
559}
560
0cbee0a4 561/*
954c1994
GS
562=for apidoc mg_free
563
564Free any magic storage used by the SV. See C<sv_magic>.
565
566=cut
567*/
568
79072805 569int
864dbfa3 570Perl_mg_free(pTHX_ SV *sv)
79072805
LW
571{
572 MAGIC* mg;
573 MAGIC* moremagic;
7918f24d
NC
574
575 PERL_ARGS_ASSERT_MG_FREE;
576
79072805 577 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 578 moremagic = mg->mg_moremagic;
d9088386 579 mg_free_struct(sv, mg);
c826f41b 580 SvMAGIC_set(sv, moremagic);
79072805 581 }
b162af07 582 SvMAGIC_set(sv, NULL);
68f8932e 583 SvMAGICAL_off(sv);
79072805
LW
584 return 0;
585}
586
d9088386
Z
587/*
588=for apidoc Am|void|mg_free_type|SV *sv|int how
589
590Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
591
592=cut
593*/
594
595void
596Perl_mg_free_type(pTHX_ SV *sv, int how)
597{
598 MAGIC *mg, *prevmg, *moremg;
599 PERL_ARGS_ASSERT_MG_FREE_TYPE;
600 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
601 MAGIC *newhead;
602 moremg = mg->mg_moremagic;
603 if (mg->mg_type == how) {
604 /* temporarily move to the head of the magic chain, in case
605 custom free code relies on this historical aspect of mg_free */
606 if (prevmg) {
607 prevmg->mg_moremagic = moremg;
608 mg->mg_moremagic = SvMAGIC(sv);
609 SvMAGIC_set(sv, mg);
610 }
611 newhead = mg->mg_moremagic;
612 mg_free_struct(sv, mg);
613 SvMAGIC_set(sv, newhead);
614 mg = prevmg;
615 }
616 }
617 mg_magical(sv);
618}
619
79072805 620#include <signal.h>
79072805 621
942e002e 622U32
864dbfa3 623Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 624{
97aff369 625 dVAR;
8772537c 626 PERL_UNUSED_ARG(sv);
6cef1e77 627
7918f24d
NC
628 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
629
0bd48802 630 if (PL_curpm) {
eb578fdb 631 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 632 if (rx) {
a678b0e4
YO
633 if (mg->mg_obj) { /* @+ */
634 /* return the number possible */
07bc277f 635 return RX_NPARENS(rx);
a678b0e4 636 } else { /* @- */
07bc277f 637 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
638
639 /* return the last filled */
f46c4081 640 while ( paren >= 0
07bc277f
NC
641 && (RX_OFFS(rx)[paren].start == -1
642 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 643 paren--;
a678b0e4
YO
644 return (U32)paren;
645 }
0bd48802 646 }
8f580fb8 647 }
ac27b0f5 648
942e002e 649 return (U32)-1;
6cef1e77
IZ
650}
651
6502e081
DM
652/* @-, @+ */
653
6cef1e77 654int
864dbfa3 655Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 656{
97aff369 657 dVAR;
7918f24d
NC
658
659 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
660
0bd48802 661 if (PL_curpm) {
eb578fdb 662 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 663 if (rx) {
eb578fdb 664 const I32 paren = mg->mg_len;
a10eae29
FC
665 SSize_t s;
666 SSize_t t;
0bd48802
AL
667 if (paren < 0)
668 return 0;
07bc277f
NC
669 if (paren <= (I32)RX_NPARENS(rx) &&
670 (s = RX_OFFS(rx)[paren].start) != -1 &&
671 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 672 {
a10eae29 673 SSize_t i;
0bd48802
AL
674 if (mg->mg_obj) /* @+ */
675 i = t;
676 else /* @- */
677 i = s;
678
a10eae29 679 if (RX_MATCH_UTF8(rx)) {
07bc277f 680 const char * const b = RX_SUBBEG(rx);
0bd48802 681 if (b)
6502e081
DM
682 i = RX_SUBCOFFSET(rx) +
683 utf8_length((U8*)b,
684 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 685 }
727405f8 686
a10eae29 687 sv_setuv(sv, i);
232af1f8 688 return 0;
1aa99e6b 689 }
0bd48802 690 }
6cef1e77 691 }
232af1f8 692 sv_setsv(sv, NULL);
6cef1e77
IZ
693 return 0;
694}
695
6502e081
DM
696/* @-, @+ */
697
e4b89193 698int
a29d06ed
MG
699Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
700{
7918f24d 701 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL
702 PERL_UNUSED_ARG(sv);
703 PERL_UNUSED_ARG(mg);
cb077ed2 704 Perl_croak_no_modify();
0dbb1585 705 NORETURN_FUNCTION_END;
a29d06ed
MG
706}
707
ad3296c6 708#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
709 if (SvPOK(sv)) { \
710 STRLEN len = SvCUR(sv); \
711 char * const p = SvPVX(sv); \
8e6b4db6
PC
712 while (len > 0 && isSPACE(p[len-1])) \
713 --len; \
714 SvCUR_set(sv, len); \
715 p[len] = '\0'; \
716 } \
ad3296c6
SH
717} STMT_END
718
8b850bd5
NC
719void
720Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
721{
7918f24d
NC
722 PERL_ARGS_ASSERT_EMULATE_COP_IO;
723
8b850bd5
NC
724 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
725 sv_setsv(sv, &PL_sv_undef);
726 else {
727 sv_setpvs(sv, "");
728 SvUTF8_off(sv);
729 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 730 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
731 assert(value);
732 sv_catsv(sv, value);
733 }
734 sv_catpvs(sv, "\0");
735 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 736 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
737 assert(value);
738 sv_catsv(sv, value);
739 }
740 }
741}
742
d9fe7d23
KW
743STATIC void
744S_fixup_errno_string(pTHX_ SV* sv)
745{
746 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
747 * Perl space. */
748
749 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
750
751 assert(SvOK(sv));
b35e4f8b
KW
752
753 if(strEQ(SvPVX(sv), "")) {
754 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
755 }
b17e32ea
KW
756#if 0
757 /* This is disabled to get v5.20 out the door. It means that $! behaves as
758 * if in the scope of both 'use locale' and 'use bytes'. This can cause
759 * mixed encodings and double utf8 upgrading, See towards the end of the
760 * thread for [perl #119499] */
b35e4f8b 761 else {
d9fe7d23 762
d3c0b317
KW
763 /* In some locales the error string may come back as UTF-8, in which
764 * case we should turn on that flag. This didn't use to happen, and to
765 * avoid any possible backward compatibility issues, we don't turn on
766 * the flag unless we have to. So the flag stays off for an entirely
767 * ASCII string. We assume that if the string looks like UTF-8, it
768 * really is UTF-8: "text in any other encoding that uses bytes with
769 * the high bit set is extremely unlikely to pass a UTF-8 validity
770 * test" (http://en.wikipedia.org/wiki/Charset_detection). There is a
771 * potential that we will get it wrong however, especially on short
772 * error message text. (If it turns out to be necessary, we could also
773 * keep track if the current LC_MESSAGES locale is UTF-8) */
774 if (! IN_BYTES /* respect 'use bytes' */
775 && ! is_ascii_string((U8*) SvPVX_const(sv), SvCUR(sv))
776 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
777 {
778 SvUTF8_on(sv);
779 }
b35e4f8b 780 }
b17e32ea 781#endif
d9fe7d23
KW
782}
783
25bbd826
CB
784#ifdef VMS
785#include <descrip.h>
786#include <starlet.h>
787#endif
788
79072805 789int
864dbfa3 790Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 791{
27da23d5 792 dVAR;
eb578fdb
KW
793 I32 paren;
794 const char *s = NULL;
795 REGEXP *rx;
823a54a3 796 const char * const remaining = mg->mg_ptr + 1;
e91d8259 797 char nextchar;
79072805 798
7918f24d
NC
799 PERL_ARGS_ASSERT_MAGIC_GET;
800
e91d8259 801 if (!mg->mg_ptr) {
e91d8259 802 paren = mg->mg_len;
e91d8259 803 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 804 do_numbuf_fetch:
e91d8259
NC
805 CALLREG_NUMBUF_FETCH(rx,paren,sv);
806 } else {
807 sv_setsv(sv,&PL_sv_undef);
808 }
809 return 0;
810 }
811
812 nextchar = *remaining;
79072805 813 switch (*mg->mg_ptr) {
748a9306 814 case '\001': /* ^A */
f2da823f
FC
815 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
816 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT
817 if (SvTAINTED(PL_bodytarget))
818 SvTAINTED_on(sv);
748a9306 819 break;
e5218da5 820 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 821 if (nextchar == '\0') {
e5218da5
GA
822 sv_setiv(sv, (IV)PL_minus_c);
823 }
823a54a3 824 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
825 sv_setiv(sv, (IV)STATUS_NATIVE);
826 }
49460fe6
NIS
827 break;
828
79072805 829 case '\004': /* ^D */
aea4f609 830 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 831 break;
28f23441 832 case '\005': /* ^E */
6c6eab55
KW
833 if (nextchar != '\0') {
834 if (strEQ(remaining, "NCODING"))
835 sv_setsv(sv, PL_encoding);
4f4ff3a7 836 break;
6c6eab55 837 }
4f4ff3a7
KW
838
839#if defined(VMS) || defined(OS2) || defined(WIN32)
840# if defined(VMS)
2a99ff86
KW
841 {
842 char msg[255];
843 $DESCRIPTOR(msgdsc,msg);
844 sv_setnv(sv,(NV) vaxc$errno);
845 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
846 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
847 else
848 sv_setpvs(sv,"");
849 }
4b645107 850#elif defined(OS2)
2a99ff86
KW
851 if (!(_emx_env & 0x200)) { /* Under DOS */
852 sv_setnv(sv, (NV)errno);
853 sv_setpv(sv, errno ? Strerror(errno) : "");
854 } else {
855 if (errno != errno_isOS2) {
856 const int tmp = _syserrno();
857 if (tmp) /* 2nd call to _syserrno() makes it 0 */
858 Perl_rc = tmp;
859 }
860 sv_setnv(sv, (NV)Perl_rc);
861 sv_setpv(sv, os2error(Perl_rc));
862 }
1534c6f5 863 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
864 fixup_errno_string(sv);
865 }
4f4ff3a7 866# elif defined(WIN32)
2a99ff86
KW
867 {
868 const DWORD dwErr = GetLastError();
869 sv_setnv(sv, (NV)dwErr);
870 if (dwErr) {
871 PerlProc_GetOSError(sv, dwErr);
2efab60d 872 fixup_errno_string(sv);
2a99ff86
KW
873 }
874 else
875 sv_setpvs(sv, "");
876 SetLastError(dwErr);
877 }
4f4ff3a7
KW
878# else
879# error Missing code for platform
880# endif
2a99ff86
KW
881 SvRTRIM(sv);
882 SvNOK_on(sv); /* what a wonderful hack! */
883 break;
4f4ff3a7
KW
884#endif /* End of platforms with special handling for $^E; others just fall
885 through to $! */
46f3e16c
KW
886
887 case '!':
888 {
5f1b979d 889 dSAVE_ERRNO;
46f3e16c 890#ifdef VMS
5f1b979d 891 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 892#else
5f1b979d 893 sv_setnv(sv, (NV)errno);
46f3e16c
KW
894#endif
895#ifdef OS2
5f1b979d
KW
896 if (errno == errno_isOS2 || errno == errno_isOS2_set)
897 sv_setpv(sv, os2error(Perl_rc));
898 else
46f3e16c 899#endif
5f1b979d
KW
900 if (! errno) {
901 sv_setpvs(sv, "");
46f3e16c 902 }
5f1b979d
KW
903 else {
904
905 /* Strerror can return NULL on some platforms, which will
906 * result in 'sv' not being considered SvOK. The SvNOK_on()
907 * below will cause just the number part to be valid */
908 sv_setpv(sv, Strerror(errno));
909 if (SvOK(sv)) {
910 fixup_errno_string(sv);
911 }
912 }
913 RESTORE_ERRNO;
46f3e16c
KW
914 }
915
916 SvRTRIM(sv);
917 SvNOK_on(sv); /* what a wonderful hack! */
918 break;
919
79072805 920 case '\006': /* ^F */
3280af22 921 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 922 break;
9ebf26ad
FR
923 case '\007': /* ^GLOBAL_PHASE */
924 if (strEQ(remaining, "LOBAL_PHASE")) {
925 sv_setpvn(sv, PL_phase_names[PL_phase],
926 strlen(PL_phase_names[PL_phase]));
927 }
928 break;
a0d0e21e 929 case '\010': /* ^H */
3280af22 930 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 931 break;
9d116dd7 932 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 933 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 934 break;
8561ea1d
FC
935 case '\014': /* ^LAST_FH */
936 if (strEQ(remaining, "AST_FH")) {
937 if (PL_last_in_gv) {
938 assert(isGV_with_GP(PL_last_in_gv));
939 SV_CHECK_THINKFIRST_COW_DROP(sv);
940 prepare_SV_for_RV(sv);
941 SvOK_off(sv);
942 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
943 SvROK_on(sv);
944 sv_rvweaken(sv);
945 }
946 else sv_setsv_nomg(sv, NULL);
947 }
948 break;
ac27b0f5 949 case '\017': /* ^O & ^OPEN */
823a54a3 950 if (nextchar == '\0') {
ac27b0f5 951 sv_setpv(sv, PL_osname);
3511154c
DM
952 SvTAINTED_off(sv);
953 }
823a54a3 954 else if (strEQ(remaining, "PEN")) {
8b850bd5 955 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 956 }
28f23441 957 break;
9ebf26ad 958 case '\020':
a6d0b1b5 959 sv_setiv(sv, (IV)PL_perldb);
79072805 960 break;
fb73857a 961 case '\023': /* ^S */
a6d0b1b5 962 {
bc177e6b 963 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 964 SvOK_off(sv);
3280af22 965 else if (PL_in_eval)
6dc8a9e4 966 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
967 else
968 sv_setiv(sv, 0);
d58bf5aa 969 }
fb73857a 970 break;
79072805 971 case '\024': /* ^T */
823a54a3 972 if (nextchar == '\0') {
88e89b8a 973#ifdef BIG_TIME
7c36658b 974 sv_setnv(sv, PL_basetime);
88e89b8a 975#else
7c36658b 976 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 977#endif
7c36658b 978 }
823a54a3 979 else if (strEQ(remaining, "AINT"))
284167a5
SM
980 sv_setiv(sv, TAINTING_get
981 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 982 : 0);
7c36658b 983 break;
e07ea26a 984 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 985 if (strEQ(remaining, "NICODE"))
a05d7ebb 986 sv_setuv(sv, (UV) PL_unicode);
823a54a3 987 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 988 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
989 else if (strEQ(remaining, "TF8CACHE"))
990 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
991 break;
992 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 993 if (nextchar == '\0')
4438c4b7 994 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 995 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 996 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 997 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
998 }
999 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC
1000 sv_setsv(sv, &PL_sv_undef);
1001 break;
013b78e8 1002 }
d3a7d8c7 1003 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
1004 /* Get the bit mask for $warnings::Bits{all}, because
1005 * it could have been extended by warnings::register */
4bac9ae4
CS
1006 HV * const bits = get_hv("warnings::Bits", 0);
1007 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1008 if (bits_all)
1009 sv_copypv(sv, *bits_all);
1010 else
1011 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1012 }
4438c4b7 1013 else {
72dc9ed5
NC
1014 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1015 *PL_compiling.cop_warnings);
ac27b0f5 1016 }
4438c4b7 1017 }
79072805 1018 break;
79072805 1019 case '+':
aaa362c4 1020 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1021 paren = RX_LASTPAREN(rx);
1022 if (paren)
1023 goto do_numbuf_fetch;
79072805 1024 }
3280af22 1025 sv_setsv(sv,&PL_sv_undef);
79072805 1026 break;
a01268b5
JH
1027 case '\016': /* ^N */
1028 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1029 paren = RX_LASTCLOSEPAREN(rx);
1030 if (paren)
1031 goto do_numbuf_fetch;
a01268b5
JH
1032 }
1033 sv_setsv(sv,&PL_sv_undef);
1034 break;
79072805 1035 case '.':
3280af22 1036 if (GvIO(PL_last_in_gv)) {
357c8808 1037 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1038 }
79072805
LW
1039 break;
1040 case '?':
809a5acc 1041 {
809a5acc 1042 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1043#ifdef COMPLEX_STATUS
41cb7b2b 1044 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1045 LvTARGOFF(sv) = PL_statusvalue;
1046 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1047#endif
809a5acc 1048 }
79072805
LW
1049 break;
1050 case '^':
acbe1b9d 1051 if (GvIOp(PL_defoutgv))
099be4f1 1052 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1053 if (s)
1054 sv_setpv(sv,s);
1055 else {
3280af22 1056 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1057 sv_catpvs(sv,"_TOP");
79072805
LW
1058 }
1059 break;
1060 case '~':
acbe1b9d 1061 if (GvIOp(PL_defoutgv))
0daa599b 1062 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1063 if (!s)
3280af22 1064 s = GvENAME(PL_defoutgv);
79072805
LW
1065 sv_setpv(sv,s);
1066 break;
79072805 1067 case '=':
099be4f1 1068 if (GvIO(PL_defoutgv))
0daa599b 1069 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1070 break;
1071 case '-':
099be4f1 1072 if (GvIO(PL_defoutgv))
0daa599b 1073 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1074 break;
1075 case '%':
099be4f1 1076 if (GvIO(PL_defoutgv))
0daa599b 1077 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1078 break;
79072805
LW
1079 case ':':
1080 break;
1081 case '/':
1082 break;
1083 case '[':
e1dccc0d 1084 sv_setiv(sv, 0);
79072805
LW
1085 break;
1086 case '|':
099be4f1 1087 if (GvIO(PL_defoutgv))
0daa599b 1088 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1089 break;
79072805 1090 case '\\':
b2ce0fda 1091 if (PL_ors_sv)
f28098ff 1092 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS
1093 else
1094 sv_setsv(sv, &PL_sv_undef);
79072805 1095 break;
0e219455 1096 case '$': /* $$ */
9cdac2a2
FC
1097 {
1098 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1099 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1100 /* never set manually, or at least not since last fork */
1101 sv_setiv(sv, pid);
19db9fb7
Z
1102 /* never unsafe, even if reading in a tainted expression */
1103 SvTAINTED_off(sv);
1104 }
9cdac2a2
FC
1105 /* else a value has been assigned manually, so do nothing */
1106 }
0e219455 1107 break;
79072805 1108 case '<':
dfff4baf 1109 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1110 break;
1111 case '>':
dfff4baf 1112 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1113 break;
1114 case '(':
dfff4baf 1115 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1116 goto add_groups;
1117 case ')':
dfff4baf 1118 sv_setgid(sv, PerlProc_getegid());
79072805 1119 add_groups:
79072805 1120#ifdef HAS_GETGROUPS
79072805 1121 {
57d7c65e 1122 Groups_t *gary = NULL;
fb45abb2 1123 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1124 Newx(gary, num_groups, Groups_t);
1125 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1126 for (i = 0; i < num_groups; i++)
1127 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1128 Safefree(gary);
79072805 1129 }
155aba94 1130 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1131#endif
79072805 1132 break;
79072805
LW
1133 case '0':
1134 break;
1135 }
a0d0e21e 1136 return 0;
79072805
LW
1137}
1138
1139int
864dbfa3 1140Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1141{
8772537c 1142 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1143
7918f24d
NC
1144 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1145
79072805 1146 if (uf && uf->uf_val)
24f81a43 1147 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1148 return 0;
1149}
1150
1151int
864dbfa3 1152Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1153{
27da23d5 1154 dVAR;
9ae3433d 1155 STRLEN len = 0, klen;
12033064 1156 const char * const key = MgPV_const(mg,klen);
888a67f6 1157 const char *s = "";
1e422769 1158
7918f24d
NC
1159 PERL_ARGS_ASSERT_MAGIC_SETENV;
1160
613c63b4 1161 SvGETMAGIC(sv);
12033064 1162 if (SvOK(sv)) {
613c63b4
CS
1163 /* defined environment variables are byte strings; unfortunately
1164 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1165 (void)SvPV_force_nomg_nolen(sv);
1166 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1167 if (SvUTF8(sv)) {
1168 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1169 SvUTF8_off(sv);
1170 }
1171 s = SvPVX(sv);
1172 len = SvCUR(sv);
12033064
CS
1173 }
1174 my_setenv(key, s); /* does the deed */
1175
a0d0e21e
LW
1176#ifdef DYNAMIC_ENV_FETCH
1177 /* We just undefd an environment var. Is a replacement */
1178 /* waiting in the wings? */
1179 if (!len) {
6bd66ee9 1180 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1181 if (valp)
4ab59fcc 1182 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1183 }
1184#endif
1e422769 1185
39e571d4 1186#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1187 /* And you'll never guess what the dog had */
1188 /* in its mouth... */
284167a5 1189 if (TAINTING_get) {
1e422769
PP
1190 MgTAINTEDDIR_off(mg);
1191#ifdef VMS
6bd66ee9 1192 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1193 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1194 int i = 0, j = 0;
1195
6fca0082 1196 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1197 elt = eltbuf;
1e422769
PP
1198 do { /* DCL$PATH may be a search list */
1199 while (1) { /* as may dev portion of any element */
1200 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1201 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1202 cando_by_name(S_IWUSR,0,elt) ) {
1203 MgTAINTEDDIR_on(mg);
1204 return 0;
1205 }
1206 }
bd61b366 1207 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1208 *cp = '\0';
1209 if (my_trnlnm(elt, eltbuf, j++))
1210 elt = eltbuf;
1211 else
1212 break;
1213 }
1214 j = 0;
1215 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1216 }
1217#endif /* VMS */
12033064 1218 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1219 const char * const strend = s + len;
463ee0b2
LW
1220
1221 while (s < strend) {
96827780 1222 char tmpbuf[256];
c623ac67 1223 Stat_t st;
5f74f29c 1224 I32 i;
f5a63d97
AL
1225#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1226 const char path_sep = '|';
1227#else
1228 const char path_sep = ':';
1229#endif
96827780 1230 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1231 s, strend, path_sep, &i);
463ee0b2 1232 s++;
bb7a0f54 1233 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1234#ifdef VMS
1235 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1236#else
1237 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1238#endif
c6ed36e1 1239 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1240 MgTAINTEDDIR_on(mg);
1e422769
PP
1241 return 0;
1242 }
463ee0b2 1243 }
79072805
LW
1244 }
1245 }
39e571d4 1246#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1247
79072805
LW
1248 return 0;
1249}
1250
1251int
864dbfa3 1252Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1253{
7918f24d 1254 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1255 PERL_UNUSED_ARG(sv);
bd61b366 1256 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1257 return 0;
1258}
1259
88e89b8a 1260int
864dbfa3 1261Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1262{
97aff369 1263 dVAR;
7918f24d 1264 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1265 PERL_UNUSED_ARG(mg);
b0269e46 1266#if defined(VMS)
cea2e8a9 1267 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1268#else
3280af22 1269 if (PL_localizing) {
fb73857a 1270 HE* entry;
b0269e46 1271 my_clearenv();
85fbaab2
NC
1272 hv_iterinit(MUTABLE_HV(sv));
1273 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1274 I32 keylen;
1275 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1276 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1277 }
1278 }
1279#endif
1280 return 0;
1281}
1282
1283int
864dbfa3 1284Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1285{
27da23d5 1286 dVAR;
7918f24d 1287 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1288 PERL_UNUSED_ARG(sv);
1289 PERL_UNUSED_ARG(mg);
b0269e46
AB
1290#if defined(VMS)
1291 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1292#else
1293 my_clearenv();
1294#endif
3e3baf6d 1295 return 0;
66b1d557
HM
1296}
1297
64ca3a65 1298#ifndef PERL_MICRO
2d4fcd5e
AJ
1299#ifdef HAS_SIGPROCMASK
1300static void
1301restore_sigmask(pTHX_ SV *save_sv)
1302{
0bd48802 1303 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1304 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1305}
1306#endif
66b1d557 1307int
864dbfa3 1308Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1309{
97aff369 1310 dVAR;
88e89b8a 1311 /* Are we fetching a signal entry? */
708854f2 1312 int i = (I16)mg->mg_private;
7918f24d
NC
1313
1314 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1315
708854f2 1316 if (!i) {
84c7b88c
BF
1317 STRLEN siglen;
1318 const char * sig = MgPV_const(mg, siglen);
1319 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1320 }
1321
e02bfb16 1322 if (i > 0) {
22c35a8c
GS
1323 if(PL_psig_ptr[i])
1324 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1325 else {
46da273f 1326 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1327#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1328 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1329 sigstate = SIG_IGN;
2e34cc90
CL
1330#endif
1331#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1332 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1333 sigstate = SIG_DFL;
85b332e2 1334#endif
88e89b8a 1335 /* cache state so we don't fetch it again */
8aad04aa 1336 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1337 sv_setpvs(sv,"IGNORE");
88e89b8a 1338 else
3280af22 1339 sv_setsv(sv,&PL_sv_undef);
46da273f 1340 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1341 SvTEMP_off(sv);
1342 }
1343 }
1344 return 0;
1345}
1346int
864dbfa3 1347Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1348{
7918f24d 1349 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1350
38a124f0 1351 magic_setsig(NULL, mg);
179c85a2 1352 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1353}
3d37d572 1354
0a8e0eff 1355Signal_t
8aad04aa 1356#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1357Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1358#else
0a8e0eff 1359Perl_csighandler(int sig)
8aad04aa 1360#endif
0a8e0eff 1361{
1018e26f
NIS
1362#ifdef PERL_GET_SIG_CONTEXT
1363 dTHXa(PERL_GET_SIG_CONTEXT);
1364#else
85b332e2
CL
1365 dTHX;
1366#endif
23ada85b 1367#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1368 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1369 if (PL_sig_ignoring[sig]) return;
85b332e2 1370#endif
2e34cc90 1371#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1372 if (PL_sig_defaulting[sig])
2e34cc90
CL
1373#ifdef KILL_BY_SIGPRC
1374 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1375#else
1376 exit(1);
1377#endif
1378#endif
406878dd 1379 if (
853d2c32
RGS
1380#ifdef SIGILL
1381 sig == SIGILL ||
1382#endif
1383#ifdef SIGBUS
1384 sig == SIGBUS ||
1385#endif
1386#ifdef SIGSEGV
1387 sig == SIGSEGV ||
1388#endif
1389 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1390 /* Call the perl level handler now--
31c91b43 1391 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1392#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1393 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1394#else
1395 (*PL_sighandlerp)(sig);
92807b6d 1396#endif
406878dd 1397 else {
31c91b43 1398 if (!PL_psig_pend) return;
406878dd
GA
1399 /* Set a flag to say this signal is pending, that is awaiting delivery after
1400 * the current Perl opcode completes */
1401 PL_psig_pend[sig]++;
1402
1403#ifndef SIG_PENDING_DIE_COUNT
1404# define SIG_PENDING_DIE_COUNT 120
1405#endif
fe13d51d 1406 /* Add one to say _a_ signal is pending */
406878dd
GA
1407 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1408 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1409 (unsigned long)SIG_PENDING_DIE_COUNT);
1410 }
0a8e0eff
NIS
1411}
1412
2e34cc90
CL
1413#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1414void
1415Perl_csighandler_init(void)
1416{
1417 int sig;
27da23d5 1418 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1419
1420 for (sig = 1; sig < SIG_SIZE; sig++) {
1421#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1422 dTHX;
27da23d5 1423 PL_sig_defaulting[sig] = 1;
5c1546dc 1424 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1425#endif
1426#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1427 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1428#endif
1429 }
27da23d5 1430 PL_sig_handlers_initted = 1;
2e34cc90
CL
1431}
1432#endif
1433
7fe50b8b
LT
1434#if defined HAS_SIGPROCMASK
1435static void
1436unblock_sigmask(pTHX_ void* newset)
1437{
1438 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1439}
1440#endif
1441
0a8e0eff
NIS
1442void
1443Perl_despatch_signals(pTHX)
1444{
97aff369 1445 dVAR;
0a8e0eff
NIS
1446 int sig;
1447 PL_sig_pending = 0;
1448 for (sig = 1; sig < SIG_SIZE; sig++) {
1449 if (PL_psig_pend[sig]) {
d0166017 1450 dSAVE_ERRNO;
7fe50b8b 1451#ifdef HAS_SIGPROCMASK
55534442
LT
1452 /* From sigaction(2) (FreeBSD man page):
1453 * | Signal routines normally execute with the signal that
1454 * | caused their invocation blocked, but other signals may
1455 * | yet occur.
1456 * Emulation of this behavior (from within Perl) is enabled
1457 * using sigprocmask
1458 */
1459 int was_blocked;
1460 sigset_t newset, oldset;
1461
1462 sigemptyset(&newset);
1463 sigaddset(&newset, sig);
1464 sigprocmask(SIG_BLOCK, &newset, &oldset);
1465 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1466 if (!was_blocked) {
1467 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1468 ENTER;
1469 SAVEFREESV(save_sv);
1470 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1471 }
55534442 1472#endif
25da4428 1473 PL_psig_pend[sig] = 0;
6e324d09 1474#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1475 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1476#else
1477 (*PL_sighandlerp)(sig);
92807b6d 1478#endif
7fe50b8b 1479#ifdef HAS_SIGPROCMASK
55534442 1480 if (!was_blocked)
7fe50b8b 1481 LEAVE;
55534442 1482#endif
d0166017 1483 RESTORE_ERRNO;
0a8e0eff
NIS
1484 }
1485 }
1486}
1487
38a124f0 1488/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1489int
864dbfa3 1490Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1491{
27da23d5 1492 dVAR;
79072805 1493 I32 i;
cbbf8932 1494 SV** svp = NULL;
2d4fcd5e
AJ
1495 /* Need to be careful with SvREFCNT_dec(), because that can have side
1496 * effects (due to closures). We must make sure that the new disposition
1497 * is in place before it is called.
1498 */
cbbf8932 1499 SV* to_dec = NULL;
e72dc28c 1500 STRLEN len;
2d4fcd5e
AJ
1501#ifdef HAS_SIGPROCMASK
1502 sigset_t set, save;
1503 SV* save_sv;
1504#endif
eb578fdb 1505 const char *s = MgPV_const(mg,len);
7918f24d
NC
1506
1507 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1508
748a9306 1509 if (*s == '_') {
84c7b88c 1510 if (memEQs(s, len, "__DIE__"))
3280af22 1511 svp = &PL_diehook;
84c7b88c 1512 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1513 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1514 /* Merge the existing behaviours, which are as follows:
1515 magic_setsig, we always set svp to &PL_warnhook
1516 (hence we always change the warnings handler)
1517 For magic_clearsig, we don't change the warnings handler if it's
1518 set to the &PL_warnhook. */
3280af22 1519 svp = &PL_warnhook;
84c7b88c
BF
1520 } else if (sv) {
1521 SV *tmp = sv_newmortal();
1522 Perl_croak(aTHX_ "No such hook: %s",
1523 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1524 }
748a9306 1525 i = 0;
38a124f0 1526 if (svp && *svp) {
9289f461
RGS
1527 if (*svp != PERL_WARNHOOK_FATAL)
1528 to_dec = *svp;
cbbf8932 1529 *svp = NULL;
4633a7c4 1530 }
748a9306
LW
1531 }
1532 else {
708854f2
NC
1533 i = (I16)mg->mg_private;
1534 if (!i) {
84c7b88c 1535 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1536 mg->mg_private = (U16)i;
708854f2 1537 }
86d86cad 1538 if (i <= 0) {
84c7b88c
BF
1539 if (sv) {
1540 SV *tmp = sv_newmortal();
1541 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1542 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1543 }
748a9306
LW
1544 return 0;
1545 }
2d4fcd5e
AJ
1546#ifdef HAS_SIGPROCMASK
1547 /* Avoid having the signal arrive at a bad time, if possible. */
1548 sigemptyset(&set);
1549 sigaddset(&set,i);
1550 sigprocmask(SIG_BLOCK, &set, &save);
1551 ENTER;
9ff8e806 1552 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1553 SAVEFREESV(save_sv);
1554 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1555#endif
1556 PERL_ASYNC_CHECK();
2e34cc90 1557#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1558 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1559#endif
23ada85b 1560#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1561 PL_sig_ignoring[i] = 0;
85b332e2 1562#endif
2e34cc90 1563#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1564 PL_sig_defaulting[i] = 0;
2e34cc90 1565#endif
2d4fcd5e 1566 to_dec = PL_psig_ptr[i];
38a124f0
NC
1567 if (sv) {
1568 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1569 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1570
1571 /* Signals don't change name during the program's execution, so once
1572 they're cached in the appropriate slot of PL_psig_name, they can
1573 stay there.
1574
1575 Ideally we'd find some way of making SVs at (C) compile time, or
1576 at least, doing most of the work. */
1577 if (!PL_psig_name[i]) {
1578 PL_psig_name[i] = newSVpvn(s, len);
1579 SvREADONLY_on(PL_psig_name[i]);
1580 }
38a124f0 1581 } else {
79fd3822 1582 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1583 PL_psig_name[i] = NULL;
1584 PL_psig_ptr[i] = NULL;
1585 }
748a9306 1586 }
38a124f0 1587 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1588 if (i) {
5c1546dc 1589 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1590 }
748a9306 1591 else
b37c2d43 1592 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1593 } else {
9dfa190b
NC
1594 if (sv && SvOK(sv)) {
1595 s = SvPV_force(sv, len);
1596 } else {
1597 sv = NULL;
1598 }
84c7b88c 1599 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1600 if (i) {
23ada85b 1601#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1602 PL_sig_ignoring[i] = 1;
1603 (void)rsignal(i, PL_csighandlerp);
85b332e2 1604#else
9dfa190b 1605 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1606#endif
9dfa190b 1607 }
2d4fcd5e 1608 }
84c7b88c 1609 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1610 if (i) {
2e34cc90 1611#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1612 PL_sig_defaulting[i] = 1;
1613 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1614#else
9dfa190b 1615 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1616#endif
9dfa190b
NC
1617 }
1618 }
1619 else {
1620 /*
1621 * We should warn if HINT_STRICT_REFS, but without
1622 * access to a known hint bit in a known OP, we can't
1623 * tell whether HINT_STRICT_REFS is in force or not.
1624 */
1625 if (!strchr(s,':') && !strchr(s,'\''))
1626 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1627 SV_GMAGIC);
1628 if (i)
1629 (void)rsignal(i, PL_csighandlerp);
1630 else
1631 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1632 }
748a9306 1633 }
9dfa190b 1634
2d4fcd5e
AJ
1635#ifdef HAS_SIGPROCMASK
1636 if(i)
1637 LEAVE;
1638#endif
ef8d46e8 1639 SvREFCNT_dec(to_dec);
79072805
LW
1640 return 0;
1641}
64ca3a65 1642#endif /* !PERL_MICRO */
79072805
LW
1643
1644int
864dbfa3 1645Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1646{
97aff369 1647 dVAR;
7918f24d 1648 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1649 PERL_UNUSED_ARG(sv);
e1a479c5 1650
89c14e2e 1651 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1652 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1653 return 0;
1654
0e446081 1655 return magic_clearisa(NULL, mg);
463ee0b2
LW
1656}
1657
0e446081 1658/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1659int
52b45067
RD
1660Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1661{
1662 dVAR;
1663 HV* stash;
1664
7918f24d
NC
1665 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1666
52b45067 1667 /* Bail out if destruction is going on */
627364f1 1668 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1669
0e446081
NC
1670 if (sv)
1671 av_clear(MUTABLE_AV(sv));
52b45067 1672
6624142a
FC
1673 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1674 /* This occurs with setisa_elem magic, which calls this
1675 same function. */
1676 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1677
316ebaf2 1678 assert(mg);
6624142a
FC
1679 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1680 SV **svp = AvARRAY((AV *)mg->mg_obj);
1681 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1682 while (items--) {
1683 stash = GvSTASH((GV *)*svp++);
1684 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1685 }
1686
1687 return 0;
1688 }
1689
52b45067 1690 stash = GvSTASH(
6624142a 1691 (const GV *)mg->mg_obj
52b45067
RD
1692 );
1693
00169e2c
FC
1694 /* The stash may have been detached from the symbol table, so check its
1695 name before doing anything. */
1696 if (stash && HvENAME_get(stash))
5562fa71 1697 mro_isa_changed_in(stash);
52b45067
RD
1698
1699 return 0;
1700}
1701
1702int
864dbfa3 1703Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1704{
85fbaab2 1705 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1706 I32 i = 0;
7918f24d
NC
1707
1708 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1709 PERL_UNUSED_ARG(mg);
7719e241 1710
6ff81951 1711 if (hv) {
497b47a8 1712 (void) hv_iterinit(hv);
ad64d0ec 1713 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1714 i = HvUSEDKEYS(hv);
497b47a8
JH
1715 else {
1716 while (hv_iternext(hv))
1717 i++;
1718 }
6ff81951
GS
1719 }
1720
1721 sv_setiv(sv, (IV)i);
1722 return 0;
1723}
1724
1725int
864dbfa3 1726Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1727{
7918f24d 1728 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1729 PERL_UNUSED_ARG(mg);
946ec16e 1730 if (LvTARG(sv)) {
85fbaab2 1731 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1732 }
1733 return 0;
ac27b0f5 1734}
946ec16e 1735
efaf3674
DM
1736/*
1737=for apidoc magic_methcall
1738
1739Invoke a magic method (like FETCH).
1740
2baee27b
FC
1741C<sv> and C<mg> are the tied thingy and the tie magic.
1742
1743C<meth> is the name of the method to call.
1744
1745C<argc> is the number of args (in addition to $self) to pass to the method.
1746
1747The C<flags> can be:
1748
1749 G_DISCARD invoke method with G_DISCARD flag and don't
1750 return a value
1751 G_UNDEF_FILL fill the stack with argc pointers to
1752 PL_sv_undef
1753
1754The arguments themselves are any values following the C<flags> argument.
efaf3674
DM
1755
1756Returns the SV (if any) returned by the method, or NULL on failure.
1757
1758
1759=cut
1760*/
1761
1762SV*
36925d9e 1763Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1764 U32 argc, ...)
a0d0e21e 1765{
97aff369 1766 dVAR;
a0d0e21e 1767 dSP;
efaf3674 1768 SV* ret = NULL;
463ee0b2 1769
7918f24d
NC
1770 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1771
efaf3674 1772 ENTER;
d1d7a15d
NC
1773
1774 if (flags & G_WRITING_TO_STDERR) {
1775 SAVETMPS;
1776
1777 save_re_context();
1778 SAVESPTR(PL_stderrgv);
1779 PL_stderrgv = NULL;
1780 }
1781
efaf3674 1782 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1783 PUSHMARK(SP);
efaf3674 1784
67549bd2
NC
1785 EXTEND(SP, argc+1);
1786 PUSHs(SvTIED_obj(sv, mg));
1787 if (flags & G_UNDEF_FILL) {
1788 while (argc--) {
efaf3674 1789 PUSHs(&PL_sv_undef);
93965878 1790 }
67549bd2 1791 } else if (argc > 0) {
046b0c7d
NC
1792 va_list args;
1793 va_start(args, argc);
1794
1795 do {
1796 SV *const sv = va_arg(args, SV *);
1797 PUSHs(sv);
1798 } while (--argc);
1799
1800 va_end(args);
88e89b8a 1801 }
463ee0b2 1802 PUTBACK;
efaf3674 1803 if (flags & G_DISCARD) {
36925d9e 1804 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1805 }
1806 else {
36925d9e 1807 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1808 ret = *PL_stack_sp--;
1809 }
1810 POPSTACK;
d1d7a15d
NC
1811 if (flags & G_WRITING_TO_STDERR)
1812 FREETMPS;
efaf3674
DM
1813 LEAVE;
1814 return ret;
1815}
1816
efaf3674 1817/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1818
efaf3674 1819STATIC SV*
36925d9e 1820S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1821 int n, SV *val)
1822{
1823 dVAR;
1824 SV* arg1 = NULL;
1825
1826 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1827
1828 if (mg->mg_ptr) {
1829 if (mg->mg_len >= 0) {
db4b3a1d 1830 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1831 }
1832 else if (mg->mg_len == HEf_SVKEY)
1833 arg1 = MUTABLE_SV(mg->mg_ptr);
1834 }
1835 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1836 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1837 sv_2mortal(arg1);
1838 }
1839 if (!arg1) {
046b0c7d 1840 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1841 }
046b0c7d 1842 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1843}
1844
76e3520e 1845STATIC int
36925d9e 1846S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1847{
efaf3674
DM
1848 dVAR;
1849 SV* ret;
463ee0b2 1850
7918f24d
NC
1851 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1852
efaf3674
DM
1853 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1854 if (ret)
1855 sv_setsv(sv, ret);
a0d0e21e
LW
1856 return 0;
1857}
463ee0b2 1858
a0d0e21e 1859int
864dbfa3 1860Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1861{
7918f24d
NC
1862 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1863
fd69380d 1864 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1865 mg->mg_flags |= MGf_GSKIP;
36925d9e 1866 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1867 return 0;
1868}
1869
1870int
864dbfa3 1871Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1872{
efaf3674 1873 dVAR;
b112cff9
DM
1874 MAGIC *tmg;
1875 SV *val;
7918f24d
NC
1876
1877 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1878
b112cff9
DM
1879 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1880 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1881 * public flags indicate its value based on copying from $val. Doing
1882 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1883 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1884 * wrong if $val happened to be tainted, as sv hasn't got magic
1885 * enabled, even though taint magic is in the chain. In which case,
1886 * fake up a temporary tainted value (this is easier than temporarily
1887 * re-enabling magic on sv). */
1888
284167a5 1889 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1890 && (tmg->mg_len & 1))
1891 {
1892 val = sv_mortalcopy(sv);
1893 SvTAINTED_on(val);
1894 }
1895 else
1896 val = sv;
1897
36925d9e 1898 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1899 return 0;
1900}
1901
1902int
864dbfa3 1903Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1904{
7918f24d
NC
1905 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1906
4c13be3f 1907 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1908 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1909}
463ee0b2 1910
93965878
NIS
1911
1912U32
864dbfa3 1913Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1914{
efaf3674 1915 dVAR;
22846ab4 1916 I32 retval = 0;
efaf3674 1917 SV* retsv;
93965878 1918
7918f24d
NC
1919 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1920
36925d9e 1921 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1922 if (retsv) {
1923 retval = SvIV(retsv)-1;
22846ab4
AB
1924 if (retval < -1)
1925 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1926 }
22846ab4 1927 return (U32) retval;
93965878
NIS
1928}
1929
cea2e8a9
GS
1930int
1931Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1932{
efaf3674 1933 dVAR;
463ee0b2 1934
7918f24d
NC
1935 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1936
36925d9e 1937 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1938 return 0;
1939}
1940
1941int
864dbfa3 1942Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1943{
efaf3674
DM
1944 dVAR;
1945 SV* ret;
463ee0b2 1946
7918f24d
NC
1947 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1948
36925d9e
RZ
1949 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1950 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1951 if (ret)
1952 sv_setsv(key,ret);
79072805
LW
1953 return 0;
1954}
1955
1956int
1146e912 1957Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1958{
7918f24d
NC
1959 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1960
36925d9e 1961 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1962}
a0d0e21e 1963
a3bcc51e
TP
1964SV *
1965Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1966{
efaf3674 1967 dVAR;
5fcbf73d 1968 SV *retval;
ad64d0ec
NC
1969 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1970 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1971
7918f24d
NC
1972 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1973
a3bcc51e
TP
1974 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1975 SV *key;
bfcb3514 1976 if (HvEITER_get(hv))
a3bcc51e
TP
1977 /* we are in an iteration so the hash cannot be empty */
1978 return &PL_sv_yes;
1979 /* no xhv_eiter so now use FIRSTKEY */
1980 key = sv_newmortal();
ad64d0ec 1981 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1982 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1983 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1984 }
1985
1986 /* there is a SCALAR method that we can call */
36925d9e 1987 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1988 if (!retval)
5fcbf73d 1989 retval = &PL_sv_undef;
a3bcc51e
TP
1990 return retval;
1991}
1992
a0d0e21e 1993int
864dbfa3 1994Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1995{
97aff369 1996 dVAR;
089b5c60 1997 SV **svp;
7918f24d
NC
1998
1999 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2000
089b5c60
NC
2001 /* The magic ptr/len for the debugger's hash should always be an SV. */
2002 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2003 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 2004 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2005 }
2006
2007 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2008 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2009 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2010 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2011
8772537c 2012 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2013 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2014 if (o) {
2015#ifdef PERL_DEBUG_READONLY_OPS
2016 Slab_to_rw(OpSLAB(o));
2017#endif
2018 /* set or clear breakpoint in the relevant control op */
089b5c60 2019 if (SvTRUE(sv))
88df5f01 2020 o->op_flags |= OPf_SPECIAL;
8772537c 2021 else
88df5f01
FC
2022 o->op_flags &= ~OPf_SPECIAL;
2023#ifdef PERL_DEBUG_READONLY_OPS
2024 Slab_to_ro(OpSLAB(o));
2025#endif
8772537c 2026 }
5df8de69 2027 }
79072805
LW
2028 return 0;
2029}
2030
2031int
8772537c 2032Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2033{
97aff369 2034 dVAR;
502c6561 2035 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2036
2037 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2038
83bf042f 2039 if (obj) {
e1dccc0d 2040 sv_setiv(sv, AvFILL(obj));
83bf042f 2041 } else {
d4a823b3 2042 sv_setsv(sv, NULL);
83bf042f 2043 }
79072805
LW
2044 return 0;
2045}
2046
2047int
864dbfa3 2048Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2049{
97aff369 2050 dVAR;
502c6561 2051 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2052
2053 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2054
83bf042f 2055 if (obj) {
e1dccc0d 2056 av_fill(obj, SvIV(sv));
83bf042f 2057 } else {
a2a5de95
NC
2058 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2059 "Attempt to set length of freed array");
83bf042f
NC
2060 }
2061 return 0;
2062}
2063
2064int
83f29afa
VP
2065Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2066{
2067 dVAR;
2068
2069 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2070 PERL_UNUSED_ARG(sv);
2071
2072 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2073#if IVSIZE == I32SIZE
2074 *((IV *) &(mg->mg_len)) = 0;
2075#else
83f29afa
VP
2076 if (mg->mg_ptr)
2077 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2078#endif
83f29afa
VP
2079
2080 return 0;
2081}
2082
2083int
83bf042f
NC
2084Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2085{
97aff369 2086 dVAR;
7918f24d
NC
2087
2088 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2089 PERL_UNUSED_ARG(sv);
7918f24d 2090
94f3782b
DM
2091 /* during global destruction, mg_obj may already have been freed */
2092 if (PL_in_clean_all)
1ea47f64 2093 return 0;
94f3782b 2094
83bf042f
NC
2095 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2096
2097 if (mg) {
2098 /* arylen scalar holds a pointer back to the array, but doesn't own a
2099 reference. Hence the we (the array) are about to go away with it
2100 still pointing at us. Clear its pointer, else it would be pointing
2101 at free memory. See the comment in sv_magic about reference loops,
2102 and why it can't own a reference to us. */
2103 mg->mg_obj = 0;
2104 }
a0d0e21e
LW
2105 return 0;
2106}
2107
2108int
864dbfa3 2109Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2110{
97aff369 2111 dVAR;
16eb5365 2112 SV* const lsv = LvTARG(sv);
96c2a8ff 2113 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2114
2115 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2116 PERL_UNUSED_ARG(mg);
ac27b0f5 2117
6174b39a
FC
2118 if (found && found->mg_len != -1) {
2119 STRLEN i = found->mg_len;
25fdce4a 2120 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2121 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2122 sv_setuv(sv, i);
a0d0e21e 2123 return 0;
a0d0e21e 2124 }
35995e5c 2125 sv_setsv(sv,NULL);
a0d0e21e
LW
2126 return 0;
2127}
2128
2129int
864dbfa3 2130Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2131{
97aff369 2132 dVAR;
16eb5365 2133 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2134 SSize_t pos;
2135 STRLEN len;
c00206c8 2136 STRLEN ulen = 0;
53d44271 2137 MAGIC* found;
aec43834 2138 const char *s;
a0d0e21e 2139
7918f24d 2140 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2141 PERL_UNUSED_ARG(mg);
ac27b0f5 2142
96c2a8ff 2143 found = mg_find_mglob(lsv);
3881461a 2144 if (!found) {
a0d0e21e
LW
2145 if (!SvOK(sv))
2146 return 0;
96c2a8ff 2147 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2148 }
2149 else if (!SvOK(sv)) {
3881461a 2150 found->mg_len = -1;
a0d0e21e
LW
2151 return 0;
2152 }
aec43834 2153 s = SvPV_const(lsv, len);
a0d0e21e 2154
e1dccc0d 2155 pos = SvIV(sv);
a0ed51b3 2156
7e2040f0 2157 if (DO_UTF8(lsv)) {
aec43834 2158 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2159 if (ulen)
2160 len = ulen;
a0ed51b3
LW
2161 }
2162
a0d0e21e
LW
2163 if (pos < 0) {
2164 pos += len;
2165 if (pos < 0)
2166 pos = 0;
2167 }
eb160463 2168 else if (pos > (SSize_t)len)
a0d0e21e 2169 pos = len;
a0ed51b3 2170
3881461a 2171 found->mg_len = pos;
25fdce4a 2172 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2173
79072805
LW
2174 return 0;
2175}
2176
2177int
864dbfa3 2178Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2179{
2180 STRLEN len;
35a4481c 2181 SV * const lsv = LvTARG(sv);
b83604b4 2182 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2183 STRLEN offs = LvTARGOFF(sv);
2184 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2185 const bool negoff = LvFLAGS(sv) & 1;
2186 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2187
2188 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2189 PERL_UNUSED_ARG(mg);
6ff81951 2190
83f78d1a 2191 if (!translate_substr_offsets(
4ddea69a 2192 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2193 negoff ? -(IV)offs : (IV)offs, !negoff,
2194 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2195 )) {
2196 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2197 sv_setsv_nomg(sv, &PL_sv_undef);
2198 return 0;
2199 }
2200
9aa983d2 2201 if (SvUTF8(lsv))
4ddea69a 2202 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2203 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2204 if (SvUTF8(lsv))
2ef4b674 2205 SvUTF8_on(sv);
6ff81951
GS
2206 return 0;
2207}
2208
2209int
864dbfa3 2210Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2211{
97aff369 2212 dVAR;
83f78d1a 2213 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2214 const char * const tmps = SvPV_const(sv, len);
dd374669 2215 SV * const lsv = LvTARG(sv);
777f7c56
EB
2216 STRLEN lvoff = LvTARGOFF(sv);
2217 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2218 const bool negoff = LvFLAGS(sv) & 1;
2219 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2220
2221 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2222 PERL_UNUSED_ARG(mg);
075a4a2b 2223
a74fb2cd
FC
2224 SvGETMAGIC(lsv);
2225 if (SvROK(lsv))
2226 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2227 "Attempt to use reference as lvalue in substr"
2228 );
fc061ed8
FC
2229 SvPV_force_nomg(lsv,lsv_len);
2230 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2231 if (!translate_substr_offsets(
2232 lsv_len,
2233 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2234 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2235 ))
2236 Perl_croak(aTHX_ "substr outside of string");
2237 oldtarglen = lvlen;
1aa99e6b 2238 if (DO_UTF8(sv)) {
73a087f0 2239 sv_utf8_upgrade_nomg(lsv);
d931b1be 2240 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2241 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2242 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2243 SvUTF8_on(lsv);
2244 }
0d336106 2245 else if (SvUTF8(lsv)) {
5fcbf73d 2246 const char *utf8;
d931b1be 2247 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2248 newtarglen = len;
5fcbf73d 2249 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2250 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2251 Safefree(utf8);
1aa99e6b 2252 }
b76f3ce2 2253 else {
a74fb2cd 2254 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2255 newtarglen = len;
b76f3ce2 2256 }
83f78d1a
FC
2257 if (!neglen) LvTARGLEN(sv) = newtarglen;
2258 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2259
79072805
LW
2260 return 0;
2261}
2262
2263int
864dbfa3 2264Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2265{
97aff369 2266 dVAR;
7918f24d
NC
2267
2268 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2269 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2270#ifdef NO_TAINT_SUPPORT
2271 PERL_UNUSED_ARG(mg);
2272#endif
7918f24d 2273
27cc343c 2274 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2275 return 0;
2276}
2277
2278int
864dbfa3 2279Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2280{
97aff369 2281 dVAR;
7918f24d
NC
2282
2283 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2284 PERL_UNUSED_ARG(sv);
7918f24d 2285
b01e650a 2286 /* update taint status */
284167a5 2287 if (TAINT_get)
b01e650a
DM
2288 mg->mg_len |= 1;
2289 else
2290 mg->mg_len &= ~1;
463ee0b2
LW
2291 return 0;
2292}
2293
2294int
864dbfa3 2295Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2296{
35a4481c 2297 SV * const lsv = LvTARG(sv);
7918f24d
NC
2298
2299 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2300 PERL_UNUSED_ARG(mg);
6ff81951 2301
2e9e14dd 2302 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2303
6ff81951
GS
2304 return 0;
2305}
2306
2307int
864dbfa3 2308Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2309{
7918f24d 2310 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2311 PERL_UNUSED_ARG(mg);
79072805
LW
2312 do_vecset(sv); /* XXX slurp this routine */
2313 return 0;
2314}
2315
13733cde
FC
2316SV *
2317Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2318{
97aff369 2319 dVAR;
a0714e2c 2320 SV *targ = NULL;
13733cde
FC
2321 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2322 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2323 assert(mg);
5f05dabc 2324 if (LvTARGLEN(sv)) {
68dc0745 2325 if (mg->mg_obj) {
8772537c 2326 SV * const ahv = LvTARG(sv);
85fbaab2 2327 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2328 if (he)
2329 targ = HeVAL(he);
68dc0745 2330 }
bbfdc870 2331 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2332 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2333 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2334 {
2335 if (SvRMAGICAL(av)) {
2336 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2337 targ = svp ? *svp : NULL;
2338 }
2339 else
bbfdc870 2340 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2341 }
68dc0745 2342 }
46da273f 2343 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2344 /* somebody else defined it for us */
2345 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2346 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2347 LvTARGLEN(sv) = 0;
2348 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2349 mg->mg_obj = NULL;
68dc0745
PP
2350 mg->mg_flags &= ~MGf_REFCOUNTED;
2351 }
13733cde 2352 return targ;
5f05dabc 2353 }
71be2cbc 2354 else
13733cde
FC
2355 return LvTARG(sv);
2356}
2357
2358int
2359Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2360{
2361 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2362
2363 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2364 return 0;
2365}
2366
2367int
864dbfa3 2368Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2369{
7918f24d 2370 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2371 PERL_UNUSED_ARG(mg);
71be2cbc 2372 if (LvTARGLEN(sv))
68dc0745
PP
2373 vivify_defelem(sv);
2374 if (LvTARG(sv)) {
5f05dabc 2375 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2376 SvSETMAGIC(LvTARG(sv));
2377 }
5f05dabc
PP
2378 return 0;
2379}
2380
71be2cbc 2381void
864dbfa3 2382Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2383{
97aff369 2384 dVAR;
74e13ce4 2385 MAGIC *mg;
a0714e2c 2386 SV *value = NULL;
71be2cbc 2387
7918f24d
NC
2388 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2389
14befaf4 2390 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2391 return;
68dc0745 2392 if (mg->mg_obj) {
8772537c 2393 SV * const ahv = LvTARG(sv);
85fbaab2 2394 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2395 if (he)
2396 value = HeVAL(he);
3280af22 2397 if (!value || value == &PL_sv_undef)
be2597df 2398 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2399 }
bbfdc870
FC
2400 else if (LvSTARGOFF(sv) < 0)
2401 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2402 else {
502c6561 2403 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2404 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2405 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2406 else {
bbfdc870 2407 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2408 if (!svp || !(value = *svp))
bbfdc870 2409 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2410 }
2411 }
b37c2d43 2412 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2413 SvREFCNT_dec(LvTARG(sv));
2414 LvTARG(sv) = value;
71be2cbc 2415 LvTARGLEN(sv) = 0;
68dc0745 2416 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2417 mg->mg_obj = NULL;
68dc0745 2418 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2419}
2420
2421int
864dbfa3 2422Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2423{
7918f24d 2424 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2425 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2426 return 0;
810b8aa5
GS
2427}
2428
2429int
864dbfa3 2430Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2431{
7918f24d 2432 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2433 PERL_UNUSED_CONTEXT;
0177730e 2434 PERL_UNUSED_ARG(sv);
565764a8 2435 mg->mg_len = -1;
93a17b20
LW
2436 return 0;
2437}
2438
2439int
864dbfa3 2440Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2441{
35a4481c 2442 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2443
7918f24d
NC
2444 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2445
79072805 2446 if (uf && uf->uf_set)
24f81a43 2447 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2448 return 0;
2449}
2450
c277df42 2451int
faf82a0b
AE
2452Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2453{
488344d2 2454 const char type = mg->mg_type;
7918f24d
NC
2455
2456 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2457
488344d2
NC
2458 if (type == PERL_MAGIC_qr) {
2459 } else if (type == PERL_MAGIC_bm) {
2460 SvTAIL_off(sv);
2461 SvVALID_off(sv);
2462 } else {
2463 assert(type == PERL_MAGIC_fm);
488344d2
NC
2464 }
2465 return sv_unmagic(sv, type);
faf82a0b
AE
2466}
2467
7a4c00b4 2468#ifdef USE_LOCALE_COLLATE
79072805 2469int
864dbfa3 2470Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2471{
7918f24d
NC
2472 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2473
bbce6d69 2474 /*
838b5b74 2475 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2476 * and vanished with a faint plop.
2477 */
96a5add6 2478 PERL_UNUSED_CONTEXT;
8772537c 2479 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2480 if (mg->mg_ptr) {
2481 Safefree(mg->mg_ptr);
2482 mg->mg_ptr = NULL;
565764a8 2483 mg->mg_len = -1;
7a4c00b4 2484 }
bbce6d69
PP
2485 return 0;
2486}
7a4c00b4 2487#endif /* USE_LOCALE_COLLATE */
bbce6d69 2488
7e8c5dac
HS
2489/* Just clear the UTF-8 cache data. */
2490int
2491Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2492{
7918f24d 2493 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2494 PERL_UNUSED_CONTEXT;
8772537c 2495 PERL_UNUSED_ARG(sv);
7e8c5dac 2496 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2497 mg->mg_ptr = NULL;
7e8c5dac
HS
2498 mg->mg_len = -1; /* The mg_len holds the len cache. */
2499 return 0;
2500}
2501
bbce6d69 2502int
864dbfa3 2503Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2504{
97aff369 2505 dVAR;
eb578fdb
KW
2506 const char *s;
2507 I32 paren;
2508 const REGEXP * rx;
79072805 2509 I32 i;
8990e307 2510 STRLEN len;
125b9982 2511 MAGIC *tmg;
2fdbfb4d 2512
7918f24d
NC
2513 PERL_ARGS_ASSERT_MAGIC_SET;
2514
e91d8259 2515 if (!mg->mg_ptr) {
960b831f 2516 paren = mg->mg_len;
1e05feb3 2517 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2518 setparen_got_rx:
2fdbfb4d 2519 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2520 } else {
2fdbfb4d
AB
2521 /* Croak with a READONLY error when a numbered match var is
2522 * set without a previous pattern match. Unless it's C<local $1>
2523 */
e91d8259 2524 croakparen:
2fdbfb4d 2525 if (!PL_localizing) {
cb077ed2 2526 Perl_croak_no_modify();
2fdbfb4d
AB
2527 }
2528 }
e91d8259
NC
2529 return 0;
2530 }
2531
2532 switch (*mg->mg_ptr) {
748a9306 2533 case '\001': /* ^A */
f2da823f
FC
2534 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2535 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2536 FmLINES(PL_bodytarget) = 0;
2537 if (SvPOK(PL_bodytarget)) {
2538 char *s = SvPVX(PL_bodytarget);
2539 while ( ((s = strchr(s, '\n'))) ) {
2540 FmLINES(PL_bodytarget)++;
2541 s++;
2542 }
2543 }
125b9982 2544 /* mg_set() has temporarily made sv non-magical */
284167a5 2545 if (TAINTING_get) {
125b9982
NT
2546 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2547 SvTAINTED_on(PL_bodytarget);
2548 else
2549 SvTAINTED_off(PL_bodytarget);
2550 }
748a9306 2551 break;
49460fe6 2552 case '\003': /* ^C */
f2338a2e 2553 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2554 break;
2555
79072805 2556 case '\004': /* ^D */
b4ab917c 2557#ifdef DEBUGGING
b83604b4 2558 s = SvPV_nolen_const(sv);
ddcf8bc1 2559 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2560 if (DEBUG_x_TEST || DEBUG_B_TEST)
2561 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2562#else
38ab35f8 2563 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2564#endif
79072805 2565 break;
28f23441 2566 case '\005': /* ^E */
d0063567 2567 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2568#ifdef VMS
38ab35f8 2569 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2570#else
2571# ifdef WIN32
d0063567 2572 SetLastError( SvIV(sv) );
e37778c2
NC
2573# else
2574# ifdef OS2
38ab35f8 2575 os2_setsyserrno(SvIV(sv));
e37778c2 2576# else
d0063567 2577 /* will anyone ever use this? */
38ab35f8 2578 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2579# endif
2580# endif
22fae026 2581#endif
d0063567
DK
2582 }
2583 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2584 SvREFCNT_dec(PL_encoding);
d0063567
DK
2585 if (SvOK(sv) || SvGMAGICAL(sv)) {
2586 PL_encoding = newSVsv(sv);
2587 }
2588 else {
a0714e2c 2589 PL_encoding = NULL;
d0063567
DK
2590 }
2591 }
2592 break;
79072805 2593 case '\006': /* ^F */
38ab35f8 2594 PL_maxsysfd = SvIV(sv);
79072805 2595 break;
a0d0e21e 2596 case '\010': /* ^H */
38ab35f8 2597 PL_hints = SvIV(sv);
a0d0e21e 2598 break;
9d116dd7 2599 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2600 Safefree(PL_inplace);
bd61b366 2601 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2602 break;
d9bad346
FC
2603 case '\016': /* ^N */
2604 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2605 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2606 goto croakparen;
28f23441 2607 case '\017': /* ^O */
ac27b0f5 2608 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2609 Safefree(PL_osname);
bd61b366 2610 PL_osname = NULL;
3511154c
DM
2611 if (SvOK(sv)) {
2612 TAINT_PROPER("assigning to $^O");
2e0de35c 2613 PL_osname = savesvpv(sv);
3511154c 2614 }
ac27b0f5
NIS
2615 }
2616 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2617 STRLEN len;
2618 const char *const start = SvPV(sv, len);
b54fc2b6 2619 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2620 SV *tmp;
8b850bd5
NC
2621
2622
2623 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2624 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2625
2626 /* Opening for input is more common than opening for output, so
2627 ensure that hints for input are sooner on linked list. */
59cd0e26 2628 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2629 SvUTF8(sv))
2630 : newSVpvs_flags("", SvUTF8(sv));
2631 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2632 mg_set(tmp);
8b850bd5 2633
f747ebd6
Z
2634 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2635 SvUTF8(sv));
2636 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2637 mg_set(tmp);
ac27b0f5 2638 }
28f23441 2639 break;
79072805 2640 case '\020': /* ^P */
2fdbfb4d
AB
2641 PL_perldb = SvIV(sv);
2642 if (PL_perldb && !PL_DBsingle)
2643 init_debugger();
9b9e0be4 2644 break;
79072805 2645 case '\024': /* ^T */
88e89b8a 2646#ifdef BIG_TIME
6b88bc9c 2647 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2648#else
38ab35f8 2649 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2650#endif
79072805 2651 break;
e07ea26a
NC
2652 case '\025': /* ^UTF8CACHE */
2653 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2654 PL_utf8cache = (signed char) sv_2iv(sv);
2655 }
2656 break;
fde18df1 2657 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2658 if (*(mg->mg_ptr+1) == '\0') {
2659 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2660 i = SvIV(sv);
ac27b0f5 2661 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2662 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2663 }
599cee73 2664 }
0a378802 2665 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2666 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2667 if (!SvPOK(sv)) {
2668 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2669 break;
2670 }
f4fc7782 2671 {
b5477537 2672 STRLEN len, i;
d3a7d8c7 2673 int accumulate = 0 ;
f4fc7782 2674 int any_fatals = 0 ;
b83604b4 2675 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2676 for (i = 0 ; i < len ; ++i) {
2677 accumulate |= ptr[i] ;
2678 any_fatals |= (ptr[i] & 0xAA) ;
2679 }
4243c432
NC
2680 if (!accumulate) {
2681 if (!specialWARN(PL_compiling.cop_warnings))
2682 PerlMemShared_free(PL_compiling.cop_warnings);
2683 PL_compiling.cop_warnings = pWARN_NONE;
2684 }
72dc9ed5 2685 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW
2686 else if (isWARN_on(
2687 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2688 WARN_ALL)
2689 && !any_fatals)
2690 {
4243c432
NC
2691 if (!specialWARN(PL_compiling.cop_warnings))
2692 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2693 PL_compiling.cop_warnings = pWARN_ALL;
2694 PL_dowarn |= G_WARN_ONCE ;
727405f8 2695 }
d3a7d8c7 2696 else {
72dc9ed5
NC
2697 STRLEN len;
2698 const char *const p = SvPV_const(sv, len);
2699
2700 PL_compiling.cop_warnings
8ee4cf24 2701 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2702 p, len);
2703
d3a7d8c7
GS
2704 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2705 PL_dowarn |= G_WARN_ONCE ;
2706 }
f4fc7782 2707
d3a7d8c7 2708 }
4438c4b7 2709 }
971a9dd3 2710 }
79072805
LW
2711 break;
2712 case '.':
3280af22
NIS
2713 if (PL_localizing) {
2714 if (PL_localizing == 1)
7766f137 2715 SAVESPTR(PL_last_in_gv);
748a9306 2716 }
3280af22 2717 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2718 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2719 break;
2720 case '^':
acbe1b9d
FC
2721 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2722 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2723 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2724 break;
2725 case '~':
acbe1b9d
FC
2726 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2727 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2728 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2729 break;
2730 case '=':
acbe1b9d 2731 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2732 break;
2733 case '-':
acbe1b9d
FC
2734 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2735 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2736 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2737 break;
2738 case '%':
acbe1b9d 2739 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2740 break;
2741 case '|':
4b65379b 2742 {
099be4f1 2743 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2744 if(!io)
2745 break;
38ab35f8 2746 if ((SvIV(sv)) == 0)
4b65379b
CS
2747 IoFLAGS(io) &= ~IOf_FLUSH;
2748 else {
2749 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2750 PerlIO *ofp = IoOFP(io);
2751 if (ofp)
2752 (void)PerlIO_flush(ofp);
2753 IoFLAGS(io) |= IOf_FLUSH;
2754 }
2755 }
79072805
LW
2756 }
2757 break;
79072805 2758 case '/':
1ab48e3a
YO
2759 {
2760 SV *tmpsv= sv;
2761 if (SvROK(sv)) {
2762 SV *referent= SvRV(sv);
2763 const char *reftype= sv_reftype(referent, 0);
2764 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2765 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2766 * a full string comparison on the return of sv_reftype() both of which
2767 * make me feel worse! NOTE, do not modify this comment without reviewing the
2768 * corresponding comment in sv_reftype(). - Yves */
2769 if (reftype[0] == 'S' || reftype[0] == 'L') {
2770 IV val= SvIV(referent);
2771 if (val <= 0) {
2772 tmpsv= &PL_sv_undef;
2773 Perl_ck_warner(aTHX_ packWARN(WARN_DEPRECATED),
2774 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2775 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2776 );
2777 }
2778 } else {
ee0ba734 2779 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
2780 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2781 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
2782 }
2783 }
b3a2acfa 2784 SvREFCNT_dec(PL_rs);
1ab48e3a 2785 PL_rs = newSVsv(tmpsv);
b3a2acfa 2786 }
79072805
LW
2787 break;
2788 case '\\':
ef8d46e8 2789 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2790 if (SvOK(sv)) {
7889fe52 2791 PL_ors_sv = newSVsv(sv);
009c130f 2792 }
e3c19b7b 2793 else {
a0714e2c 2794 PL_ors_sv = NULL;
e3c19b7b 2795 }
79072805 2796 break;
7d69d4a6
FC
2797 case '[':
2798 if (SvIV(sv) != 0)
2799 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2800 break;
79072805 2801 case '?':
ff0cee69 2802#ifdef COMPLEX_STATUS
6b88bc9c 2803 if (PL_localizing == 2) {
41cb7b2b 2804 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2805 PL_statusvalue = LvTARGOFF(sv);
2806 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2807 }
2808 else
2809#endif
2810#ifdef VMSISH_STATUS
2811 if (VMSISH_STATUS)
fb38d079 2812 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2813 else
2814#endif
38ab35f8 2815 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2816 break;
2817 case '!':
93189314
JH
2818 {
2819#ifdef VMS
2820# define PERL_VMS_BANG vaxc$errno
2821#else
2822# define PERL_VMS_BANG 0
2823#endif
27329181 2824#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2825 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2826 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2827#else
91487cfc 2828 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2829 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2830#endif
93189314 2831 }
79072805
LW
2832 break;
2833 case '<':
985213f2 2834 {
04783dc7 2835 int rc = 0;
dfff4baf 2836 const Uid_t new_uid = SvUID(sv);
985213f2 2837 PL_delaymagic_uid = new_uid;
3280af22
NIS
2838 if (PL_delaymagic) {
2839 PL_delaymagic |= DM_RUID;
79072805
LW
2840 break; /* don't do magic till later */
2841 }
2842#ifdef HAS_SETRUID
04783dc7 2843 rc = setruid(new_uid);
79072805
LW
2844#else
2845#ifdef HAS_SETREUID
04783dc7 2846 rc = setreuid(new_uid, (Uid_t)-1);
748a9306 2847#else
85e6fe83 2848#ifdef HAS_SETRESUID
04783dc7 2849 rc = setresuid(new_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2850#else
985213f2 2851 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2852#ifdef PERL_DARWIN
2853 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2854 if (new_uid != 0 && PerlProc_getuid() == 0)
04783dc7 2855 rc = PerlProc_setuid(0);
75870ed3 2856#endif
04783dc7 2857 rc = PerlProc_setuid(new_uid);
75870ed3 2858 } else {
cea2e8a9 2859 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2860 }
79072805
LW
2861#endif
2862#endif
85e6fe83 2863#endif
04783dc7
DM
2864 /* XXX $< currently silently ignores failures */
2865 PERL_UNUSED_VAR(rc);
79072805 2866 break;
985213f2 2867 }
79072805 2868 case '>':
985213f2 2869 {
04783dc7 2870 int rc = 0;
dfff4baf 2871 const Uid_t new_euid = SvUID(sv);
985213f2 2872 PL_delaymagic_euid = new_euid;
3280af22
NIS
2873 if (PL_delaymagic) {
2874 PL_delaymagic |= DM_EUID;
79072805
LW
2875 break; /* don't do magic till later */
2876 }
2877#ifdef HAS_SETEUID
04783dc7 2878 rc = seteuid(new_euid);
79072805
LW
2879#else
2880#ifdef HAS_SETREUID
04783dc7 2881 rc = setreuid((Uid_t)-1, new_euid);
85e6fe83
LW
2882#else
2883#ifdef HAS_SETRESUID
04783dc7 2884 rc = setresuid((Uid_t)-1, new_euid, (Uid_t)-1);
79072805 2885#else
985213f2 2886 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
04783dc7 2887 rc = PerlProc_setuid(new_euid);
a0d0e21e 2888 else {
cea2e8a9 2889 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2890 }
79072805
LW
2891#endif
2892#endif
85e6fe83 2893#endif
04783dc7
DM
2894 /* XXX $> currently silently ignores failures */
2895 PERL_UNUSED_VAR(rc);
79072805 2896 break;
985213f2 2897 }
79072805 2898 case '(':
985213f2 2899 {
04783dc7 2900 int rc = 0;
dfff4baf 2901 const Gid_t new_gid = SvGID(sv);
985213f2 2902 PL_delaymagic_gid = new_gid;
3280af22
NIS
2903 if (PL_delaymagic) {
2904 PL_delaymagic |= DM_RGID;
79072805
LW
2905 break; /* don't do magic till later */
2906 }
2907#ifdef HAS_SETRGID
04783dc7 2908 rc = setrgid(new_gid);
79072805
LW
2909#else
2910#ifdef HAS_SETREGID
04783dc7 2911 rc = setregid(new_gid, (Gid_t)-1);
85e6fe83
LW
2912#else
2913#ifdef HAS_SETRESGID
04783dc7 2914 rc = setresgid(new_gid, (Gid_t)-1, (Gid_t) -1);
79072805 2915#else
985213f2 2916 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
04783dc7 2917 rc = PerlProc_setgid(new_gid);
748a9306 2918 else {
cea2e8a9 2919 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2920 }
79072805
LW
2921#endif
2922#endif
85e6fe83 2923#endif
04783dc7
DM
2924 /* XXX $( currently silently ignores failures */
2925 PERL_UNUSED_VAR(rc);
79072805 2926 break;
985213f2 2927 }
79072805 2928 case ')':
985213f2 2929 {
04783dc7 2930 int rc = 0;
dfff4baf 2931 Gid_t new_egid;
5cd24f17
PP
2932#ifdef HAS_SETGROUPS
2933 {
b83604b4 2934 const char *p = SvPV_const(sv, len);
757f63d8 2935 Groups_t *gary = NULL;
fb4089e0 2936#ifdef _SC_NGROUPS_MAX
2937 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2938
2939 if (maxgrp < 0)
2940 maxgrp = NGROUPS;
2941#else
2942 int maxgrp = NGROUPS;
2943#endif
757f63d8
SP
2944
2945 while (isSPACE(*p))
2946 ++p;
dfff4baf 2947 new_egid = (Gid_t)Atol(p);
fb4089e0 2948 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP
2949 while (*p && !isSPACE(*p))
2950 ++p;
2951 while (isSPACE(*p))
2952 ++p;
2953 if (!*p)
2954 break;
2955 if(!gary)
2956 Newx(gary, i + 1, Groups_t);
2957 else
2958 Renew(gary, i + 1, Groups_t);
dfff4baf 2959 gary[i] = (Groups_t)Atol(p);
757f63d8
SP
2960 }
2961 if (i)
04783dc7 2962 rc = setgroups(i, gary);
f5a63d97 2963 Safefree(gary);
5cd24f17
PP
2964 }
2965#else /* HAS_SETGROUPS */
dfff4baf 2966 new_egid = SvGID(sv);
5cd24f17 2967#endif /* HAS_SETGROUPS */
985213f2 2968 PL_delaymagic_egid = new_egid;
3280af22
NIS
2969 if (PL_delaymagic) {
2970 PL_delaymagic |= DM_EGID;
79072805
LW
2971 break; /* don't do magic till later */
2972 }
2973#ifdef HAS_SETEGID
04783dc7 2974 rc = setegid(new_egid);
79072805
LW
2975#else
2976#ifdef HAS_SETREGID
04783dc7 2977 rc = setregid((Gid_t)-1, new_egid);
85e6fe83
LW
2978#else
2979#ifdef HAS_SETRESGID
04783dc7 2980 rc = setresgid((Gid_t)-1, new_egid, (Gid_t)-1);
79072805 2981#else
985213f2 2982 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
04783dc7 2983 rc = PerlProc_setgid(new_egid);
748a9306 2984 else {
cea2e8a9 2985 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2986 }
79072805
LW
2987#endif
2988#endif
85e6fe83 2989#endif
04783dc7
DM
2990 /* XXX $) currently silently ignores failures */
2991 PERL_UNUSED_VAR(rc);
79072805 2992 break;
985213f2 2993 }
79072805 2994 case ':':
2d8e6c8d 2995 PL_chopset = SvPV_force(sv,len);
79072805 2996 break;
9cdac2a2
FC
2997 case '$': /* $$ */
2998 /* Store the pid in mg->mg_obj so we can tell when a fork has
2999 occurred. mg->mg_obj points to *$ by default, so clear it. */
3000 if (isGV(mg->mg_obj)) {
3001 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3002 SvREFCNT_dec(mg->mg_obj);
3003 mg->mg_flags |= MGf_REFCOUNTED;
3004 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3005 }
3006 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3007 break;
79072805 3008 case '0':
e2975953 3009 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
3010#ifdef HAS_SETPROCTITLE
3011 /* The BSDs don't show the argv[] in ps(1) output, they
3012 * show a string from the process struct and provide
3013 * the setproctitle() routine to manipulate that. */
a2722ac9 3014 if (PL_origalen != 1) {
b83604b4 3015 s = SvPV_const(sv, len);
98b76f99 3016# if __FreeBSD_version > 410001
9aad2c0e 3017 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
3018 * but not the "(perl) suffix from the ps(1)
3019 * output, because that's what ps(1) shows if the
3020 * argv[] is modified. */
6f2ad931 3021 setproctitle("-%s", s);
9aad2c0e 3022# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
3023 /* This doesn't really work if you assume that
3024 * $0 = 'foobar'; will wipe out 'perl' from the $0
3025 * because in ps(1) output the result will be like
3026 * sprintf("perl: %s (perl)", s)
3027 * I guess this is a security feature:
3028 * one (a user process) cannot get rid of the original name.
3029 * --jhi */
3030 setproctitle("%s", s);
3031# endif
3032 }
9d3968b2 3033#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 3034 if (PL_origalen != 1) {
17aa7f3d 3035 union pstun un;
b83604b4 3036 s = SvPV_const(sv, len);
6867be6d 3037 un.pst_command = (char *)s;
17aa7f3d
JH
3038 pstat(PSTAT_SETCMD, un, len, 0, 0);
3039 }
9d3968b2 3040#else
2d2af554
GA
3041 if (PL_origalen > 1) {
3042 /* PL_origalen is set in perl_parse(). */
3043 s = SvPV_force(sv,len);
3044 if (len >= (STRLEN)PL_origalen-1) {
3045 /* Longer than original, will be truncated. We assume that
3046 * PL_origalen bytes are available. */
3047 Copy(s, PL_origargv[0], PL_origalen-1, char);
3048 }
3049 else {
3050 /* Shorter than original, will be padded. */
235ac35d 3051#ifdef PERL_DARWIN
60777a0d
JH
3052 /* Special case for Mac OS X: see [perl #38868] */
3053 const int pad = 0;
235ac35d 3054#else
8a89a4f1
MB
3055 /* Is the space counterintuitive? Yes.
3056 * (You were expecting \0?)
3057 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3058 * --jhi */
60777a0d 3059 const int pad = ' ';
235ac35d 3060#endif
60777a0d
JH
3061 Copy(s, PL_origargv[0], len, char);
3062 PL_origargv[0][len] = 0;
3063 memset(PL_origargv[0] + len + 1,
3064 pad, PL_origalen - len - 1);
2d2af554
GA
3065 }
3066 PL_origargv[0][PL_origalen-1] = 0;
3067 for (i = 1; i < PL_origargc; i++)
3068 PL_origargv[i] = 0;
7636ea95
AB
3069#ifdef HAS_PRCTL_SET_NAME
3070 /* Set the legacy process name in addition to the POSIX name on Linux */
3071 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3072 /* diag_listed_as: SKIPME */
3073 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3074 }
3075#endif
79072805 3076 }
9d3968b2 3077#endif
e2975953 3078 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3079 break;
3080 }
3081 return 0;
3082}
3083
3084I32
84c7b88c
BF
3085Perl_whichsig_sv(pTHX_ SV *sigsv)
3086{
3087 const char *sigpv;
3088 STRLEN siglen;
3089 PERL_ARGS_ASSERT_WHICHSIG_SV;
3090 PERL_UNUSED_CONTEXT;
3091 sigpv = SvPV_const(sigsv, siglen);
3092 return whichsig_pvn(sigpv, siglen);
3093}
3094
3095I32
3096Perl_whichsig_pv(pTHX_ const char *sig)
3097{
3098 PERL_ARGS_ASSERT_WHICHSIG_PV;
3099 PERL_UNUSED_CONTEXT;
3100 return whichsig_pvn(sig, strlen(sig));
3101}
3102
3103I32
3104Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3105{
eb578fdb 3106 char* const* sigv;
7918f24d 3107
84c7b88c 3108 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3109 PERL_UNUSED_CONTEXT;
79072805 3110
aadb217d 3111 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3112 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3113 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3114#ifdef SIGCLD
84c7b88c 3115 if (memEQs(sig, len, "CHLD"))
79072805
LW
3116 return SIGCLD;
3117#endif
3118#ifdef SIGCHLD
84c7b88c 3119 if (memEQs(sig, len, "CLD"))
79072805
LW
3120 return SIGCHLD;
3121#endif
7f1236c0 3122 return -1;
79072805
LW
3123}
3124
ecfc5424 3125Signal_t
1e82f5a6 3126#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3127Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3128#else
3129Perl_sighandler(int sig)
3130#endif
79072805 3131{
1018e26f
NIS
3132#ifdef PERL_GET_SIG_CONTEXT
3133 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3134#else
cea2e8a9 3135 dTHX;
71d280e3 3136#endif
79072805 3137 dSP;
a0714e2c
SS
3138 GV *gv = NULL;
3139 SV *sv = NULL;
8772537c 3140 SV * const tSv = PL_Sv;
601f1833 3141 CV *cv = NULL;
533c011a 3142 OP *myop = PL_op;
84902520 3143 U32 flags = 0;
8772537c 3144 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3145 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3146 SV *errsv_save = NULL;
71d280e3 3147
84902520 3148
727405f8 3149 if (!PL_psig_ptr[sig]) {
99ef548b 3150 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3151 PL_sig_name[sig]);
3152 exit(sig);
3153 }
ff0cee69 3154
a0d63a7b
DM
3155 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3156 /* Max number of items pushed there is 3*n or 4. We cannot fix
3157 infinity, so we fix 4 (in fact 5): */
3158 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3159 flags |= 1;
3160 PL_savestack_ix += 5; /* Protect save in progress. */
3161 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3162 }
84902520 3163 }
84902520 3164 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3165 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3166 || SvTYPE(cv) != SVt_PVCV) {
3167 HV *st;
f2c0649b 3168 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3169 }
84902520 3170
a0d0e21e 3171 if (!cv || !CvROOT(cv)) {
a2a5de95
NC
3172 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3173 PL_sig_name[sig], (gv ? GvENAME(gv)
3174 : ((cv && CvGV(cv))
3175 ? GvENAME(CvGV(cv))
3176 : "__ANON__")));
00d579c5 3177 goto cleanup;
79072805
LW
3178 }
3179
0c4d3b5e
DM
3180 sv = PL_psig_name[sig]
3181 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3182 : newSVpv(PL_sig_name[sig],0);
72048cfe 3183 flags |= 8;
0c4d3b5e
DM
3184 SAVEFREESV(sv);
3185
a0d63a7b
DM
3186 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3187 /* make sure our assumption about the size of the SAVEs are correct:
3188 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3189 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3190 }
e336de0d 3191
e788e7d3 3192 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3193 PUSHMARK(SP);
79072805 3194 PUSHs(sv);
8aad04aa
JH
3195#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3196 {
3197 struct sigaction oact;
3198
3199 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3200 if (sip) {
3201 HV *sih = newHV();
ad64d0ec 3202 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3203 /* The siginfo fields signo, code, errno, pid, uid,
3204 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3205 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3206 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3207#if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */
85771703
NC
3208 hv_stores(sih, "errno", newSViv(sip->si_errno));
3209 hv_stores(sih, "status", newSViv(sip->si_status));
3210 hv_stores(sih, "uid", newSViv(sip->si_uid));
3211 hv_stores(sih, "pid", newSViv(sip->si_pid));
3212 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3213 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3214#endif
8aad04aa 3215 EXTEND(SP, 2);
ad64d0ec 3216 PUSHs(rv);
22f1178f 3217 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3218 }
b4552a27 3219
8aad04aa
JH
3220 }
3221 }
3222#endif
79072805 3223 PUTBACK;
a0d0e21e 3224
100c03aa
JL
3225 errsv_save = newSVsv(ERRSV);
3226
ad64d0ec 3227 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3228
d3acc0f7 3229 POPSTACK;
eed484f9
DD
3230 {
3231 SV * const errsv = ERRSV;
3232 if (SvTRUE_NN(errsv)) {
3233 SvREFCNT_dec(errsv_save);
c22d665b 3234#ifndef PERL_MICRO
1b266415
NIS
3235 /* Handler "died", for example to get out of a restart-able read().
3236 * Before we re-do that on its behalf re-enable the signal which was
3237 * blocked by the system when we entered.
3238 */
c22d665b 3239#ifdef HAS_SIGPROCMASK
d488af49 3240#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3241 if (sip || uap)
c22d665b 3242#endif
eed484f9
DD
3243 {
3244 sigset_t set;
3245 sigemptyset(&set);
3246 sigaddset(&set,sig);
3247 sigprocmask(SIG_UNBLOCK, &set, NULL);
3248 }
c22d665b 3249#else
eed484f9
DD
3250 /* Not clear if this will work */
3251 (void)rsignal(sig, SIG_IGN);
3252 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3253#endif
3254#endif /* !PERL_MICRO */
eed484f9
DD
3255 die_sv(errsv);
3256 }
3257 else {
3258 sv_setsv(errsv, errsv_save);
3259 SvREFCNT_dec(errsv_save);
3260 }
100c03aa
JL
3261 }
3262
00d579c5 3263cleanup:
0c4d3b5e
DM
3264 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3265 PL_savestack_ix = old_ss_ix;
72048cfe 3266 if (flags & 8)
2357bae7 3267 SvREFCNT_dec_NN(sv);
533c011a 3268 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3269
3280af22
NIS
3270 PL_Sv = tSv; /* Restore global temporaries. */
3271 PL_Xpv = tXpv;
53bb94e2 3272 return;
79072805 3273}
4e35701f
NIS
3274
3275
51371543 3276static void
8772537c 3277S_restore_magic(pTHX_ const void *p)
51371543 3278{
97aff369 3279 dVAR;
8772537c
AL
3280 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3281 SV* const sv = mgs->mgs_sv;
150b625d 3282 bool bumped;
51371543
GS
3283
3284 if (!sv)
3285 return;
3286
4bac9ae4
CS
3287 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3288 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3289#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
3290 /* While magic was saved (and off) sv_setsv may well have seen
3291 this SV as a prime candidate for COW. */
3292 if (SvIsCOW(sv))
e424a81e 3293 sv_force_normal_flags(sv, 0);
f9701176 3294#endif
f9c6fee5
CS
3295 if (mgs->mgs_readonly)
3296 SvREADONLY_on(sv);
3297 if (mgs->mgs_magical)
3298 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS
3299 else
3300 mg_magical(sv);
51371543
GS
3301 }
3302
150b625d 3303 bumped = mgs->mgs_bumped;
51371543
GS
3304 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3305
3306 /* If we're still on top of the stack, pop us off. (That condition
3307 * will be satisfied if restore_magic was called explicitly, but *not*
3308 * if it's being called via leave_scope.)
3309 * The reason for doing this is that otherwise, things like sv_2cv()
3310 * may leave alloc gunk on the savestack, and some code
3311 * (e.g. sighandler) doesn't expect that...
3312 */
3313 if (PL_savestack_ix == mgs->mgs_ss_ix)
3314 {
1be36ce0
NC
3315 UV popval = SSPOPUV;
3316 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3317 PL_savestack_ix -= 2;
1be36ce0
NC
3318 popval = SSPOPUV;
3319 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3320 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3321 }
150b625d
DM
3322 if (bumped) {
3323 if (SvREFCNT(sv) == 1) {
3324 /* We hold the last reference to this SV, which implies that the
3325 SV was deleted as a side effect of the routines we called.
3326 So artificially keep it alive a bit longer.
3327 We avoid turning on the TEMP flag, which can cause the SV's
3328 buffer to get stolen (and maybe other stuff). */
150b625d 3329 sv_2mortal(sv);
4bac9ae4 3330 SvTEMP_off(sv);
8985fe98 3331 }
150b625d 3332 else
2357bae7 3333 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3334 }
51371543
GS
3335}
3336
0c4d3b5e
DM
3337/* clean up the mess created by Perl_sighandler().
3338 * Note that this is only called during an exit in a signal handler;
3339 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3340 * skipped over. */
0c4d3b5e 3341
51371543 3342static void
8772537c 3343S_unwind_handler_stack(pTHX_ const void *p)
51371543 3344{
27da23d5 3345 dVAR;
0c4d3b5e 3346 PERL_UNUSED_ARG(p);
7918f24d 3347
0c4d3b5e 3348 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3349}
1018e26f 3350
66610fdd 3351/*
b3ca2e83
NC
3352=for apidoc magic_sethint
3353
3354Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3355C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3356anything that would need a deep copy. Maybe we should warn if we find a
3357reference.
b3ca2e83
NC
3358
3359=cut
3360*/
3361int
3362Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3363{
3364 dVAR;
ad64d0ec 3365 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3366 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3367
7918f24d
NC
3368 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3369
e6e3e454
NC
3370 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3371 an alternative leaf in there, with PL_compiling.cop_hints being used if
3372 it's NULL. If needed for threads, the alternative could lock a mutex,
3373 or take other more complex action. */
3374
5b9c0671
NC
3375 /* Something changed in %^H, so it will need to be restored on scope exit.
3376 Doing this here saves a lot of doing it manually in perl code (and
3377 forgetting to do it, and consequent subtle errors. */
3378 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3379 CopHINTHASH_set(&PL_compiling,
3380 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3381 return 0;
3382}
3383
3384/*
f175cff5 3385=for apidoc magic_clearhint
b3ca2e83 3386
c28fe1ec
NC
3387Triggered by a delete from %^H, records the key to
3388C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3389
3390=cut
3391*/
3392int
3393Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3394{
3395 dVAR;
7918f24d
NC
3396
3397 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3398 PERL_UNUSED_ARG(sv);
3399
5b9c0671 3400 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3401 CopHINTHASH_set(&PL_compiling,
e3352591
FC
3402 mg->mg_len == HEf_SVKEY
3403 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3404 MUTABLE_SV(mg->mg_ptr), 0, 0)
3405 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3406 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC
3407 return 0;
3408}
3409
3410/*
f747ebd6
Z
3411=for apidoc magic_clearhints
3412
3413Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3414
3415=cut
3416*/
3417int
3418Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3419{
3420 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3421 PERL_UNUSED_ARG(sv);
3422 PERL_UNUSED_ARG(mg);
20439bc7
Z
3423 cophh_free(CopHINTHASH_get(&PL_compiling));
3424 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z
3425 return 0;
3426}
3427
09fb282d
FC
3428int
3429Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3430 const char *name, I32 namlen)
3431{
3432 MAGIC *nmg;
3433
3434 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3435 PERL_UNUSED_ARG(sv);
09fb282d
FC
3436 PERL_UNUSED_ARG(name);
3437 PERL_UNUSED_ARG(namlen);
3438
3439 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3440 nmg = mg_find(nsv, mg->mg_type);
316ebaf2 3441 assert(nmg);
09fb282d
FC
3442 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3443 nmg->mg_ptr = mg->mg_ptr;
3444 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3445 nmg->mg_flags |= MGf_REFCOUNTED;
3446 return 1;
3447}
3448
f747ebd6 3449/*
66610fdd
RGS
3450 * Local variables:
3451 * c-indentation-style: bsd
3452 * c-basic-offset: 4
14d04a33 3453 * indent-tabs-mode: nil
66610fdd
RGS
3454 * End:
3455 *
14d04a33 3456 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3457 */