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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
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
166f8a29
DM		 26number of the last read filehandle into to the SV's IV slot), while
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
32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33of functions that implement the get(), set(), length() etc functions,
34plus space for some flags and pointers. For example, a tied variable has
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 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 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
DD		 165Do magic before a value is retrieved from the SV. The type of SV must
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
CS		 495Copy some of the magic from an existing SV to new localized version of that
496SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
497taint, pos).
498
af7df257 499If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS		 500This typically means that assignment will soon follow (e.g. 'local $x = $y'),
501and that will handle the magic.
0cbee0a4
DM		 502
503=cut
504*/
505
506void
af7df257 507Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 508{
97aff369 509 dVAR;
0cbee0a4 510 MAGIC *mg;
7918f24d
NC		 511
512 PERL_ARGS_ASSERT_MG_LOCALIZE;
513
658a9f31
JD		 514 if (nsv == DEFSV)
515 return;
516
0cbee0a4 517 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 518 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 519 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 520 continue;
0cbee0a4 521
a5063e7c 522 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 523 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 524 else
0cbee0a4
DM		 525 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
526 mg->mg_ptr, mg->mg_len);
a5063e7c 527
0cbee0a4 528 /* container types should remain read-only across localization */
9ff3e6d8 529 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM		 530 }
531
532 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
533 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 534 if (setmagic) {
9711599e
CS		 535 PL_localizing = 1;
536 SvSETMAGIC(nsv);
537 PL_localizing = 0;
538 }
0cbee0a4
DM		 539 }
540}
541
d9088386
Z		 542#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
543static void
544S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
545{
546 const MGVTBL* const vtbl = mg->mg_virtual;
547 if (vtbl && vtbl->svt_free)
548 vtbl->svt_free(aTHX_ sv, mg);
549 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
550 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
551 Safefree(mg->mg_ptr);
552 else if (mg->mg_len == HEf_SVKEY)
553 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
554 }
555 if (mg->mg_flags & MGf_REFCOUNTED)
556 SvREFCNT_dec(mg->mg_obj);
557 Safefree(mg);
558}
559
0cbee0a4 560/*
954c1994
GS		 561=for apidoc mg_free
562
563Free any magic storage used by the SV. See C<sv_magic>.
564
565=cut
566*/
567
79072805 568int
864dbfa3 569Perl_mg_free(pTHX_ SV *sv)
79072805
LW		 570{
571 MAGIC* mg;
572 MAGIC* moremagic;
7918f24d
NC		 573
574 PERL_ARGS_ASSERT_MG_FREE;
575
79072805 576 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 577 moremagic = mg->mg_moremagic;
d9088386 578 mg_free_struct(sv, mg);
c826f41b 579 SvMAGIC_set(sv, moremagic);
79072805 580 }
b162af07 581 SvMAGIC_set(sv, NULL);
68f8932e 582 SvMAGICAL_off(sv);
79072805
LW		 583 return 0;
584}
585
d9088386
Z		 586/*
587=for apidoc Am|void|mg_free_type|SV *sv|int how
588
589Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
590
591=cut
592*/
593
594void
595Perl_mg_free_type(pTHX_ SV *sv, int how)
596{
597 MAGIC *mg, *prevmg, *moremg;
598 PERL_ARGS_ASSERT_MG_FREE_TYPE;
599 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
600 MAGIC *newhead;
601 moremg = mg->mg_moremagic;
602 if (mg->mg_type == how) {
603 /* temporarily move to the head of the magic chain, in case
604 custom free code relies on this historical aspect of mg_free */
605 if (prevmg) {
606 prevmg->mg_moremagic = moremg;
607 mg->mg_moremagic = SvMAGIC(sv);
608 SvMAGIC_set(sv, mg);
609 }
610 newhead = mg->mg_moremagic;
611 mg_free_struct(sv, mg);
612 SvMAGIC_set(sv, newhead);
613 mg = prevmg;
614 }
615 }
616 mg_magical(sv);
617}
618
79072805 619#include <signal.h>
79072805 620
942e002e 621U32
864dbfa3 622Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 623{
97aff369 624 dVAR;
8772537c 625 PERL_UNUSED_ARG(sv);
6cef1e77 626
7918f24d
NC		 627 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
628
0bd48802 629 if (PL_curpm) {
eb578fdb 630 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 631 if (rx) {
a678b0e4
YO		 632 if (mg->mg_obj) { /* @+ */
633 /* return the number possible */
07bc277f 634 return RX_NPARENS(rx);
a678b0e4 635 } else { /* @- */
07bc277f 636 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO		 637
638 /* return the last filled */
f46c4081 639 while ( paren >= 0
07bc277f
NC		 640 && (RX_OFFS(rx)[paren].start == -1
641 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 642 paren--;
a678b0e4
YO		 643 return (U32)paren;
644 }
0bd48802 645 }
8f580fb8 646 }
ac27b0f5 647
942e002e 648 return (U32)-1;
6cef1e77
IZ		 649}
650
6502e081
DM		 651/* @-, @+ */
652
6cef1e77 653int
864dbfa3 654Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 655{
97aff369 656 dVAR;
7918f24d
NC		 657
658 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
659
0bd48802 660 if (PL_curpm) {
eb578fdb 661 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 662 if (rx) {
eb578fdb 663 const I32 paren = mg->mg_len;
a10eae29
FC		 664 SSize_t s;
665 SSize_t t;
0bd48802
AL		 666 if (paren < 0)
667 return 0;
07bc277f
NC		 668 if (paren <= (I32)RX_NPARENS(rx) &&
669 (s = RX_OFFS(rx)[paren].start) != -1 &&
670 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 671 {
a10eae29 672 SSize_t i;
0bd48802
AL		 673 if (mg->mg_obj) /* @+ */
674 i = t;
675 else /* @- */
676 i = s;
677
a10eae29 678 if (RX_MATCH_UTF8(rx)) {
07bc277f 679 const char * const b = RX_SUBBEG(rx);
0bd48802 680 if (b)
6502e081
DM		 681 i = RX_SUBCOFFSET(rx) +
682 utf8_length((U8*)b,
683 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 684 }
727405f8 685
a10eae29 686 sv_setuv(sv, i);
232af1f8 687 return 0;
1aa99e6b 688 }
0bd48802 689 }
6cef1e77 690 }
232af1f8 691 sv_setsv(sv, NULL);
6cef1e77
IZ		 692 return 0;
693}
694
6502e081
DM		 695/* @-, @+ */
696
e4b89193 697int
a29d06ed
MG		 698Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
699{
7918f24d 700 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL		 701 PERL_UNUSED_ARG(sv);
702 PERL_UNUSED_ARG(mg);
cb077ed2 703 Perl_croak_no_modify();
0dbb1585 704 NORETURN_FUNCTION_END;
a29d06ed
MG		 705}
706
ad3296c6 707#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA		 708 if (SvPOK(sv)) { \
709 STRLEN len = SvCUR(sv); \
710 char * const p = SvPVX(sv); \
8e6b4db6
PC		 711 while (len > 0 && isSPACE(p[len-1])) \
712 --len; \
713 SvCUR_set(sv, len); \
714 p[len] = '\0'; \
715 } \
ad3296c6
SH		 716} STMT_END
717
8b850bd5
NC		 718void
719Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
720{
7918f24d
NC		 721 PERL_ARGS_ASSERT_EMULATE_COP_IO;
722
8b850bd5
NC		 723 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
724 sv_setsv(sv, &PL_sv_undef);
725 else {
726 sv_setpvs(sv, "");
727 SvUTF8_off(sv);
728 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 729 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC		 730 assert(value);
731 sv_catsv(sv, value);
732 }
733 sv_catpvs(sv, "\0");
734 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 735 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC		 736 assert(value);
737 sv_catsv(sv, value);
738 }
739 }
740}
741
25bbd826
CB		 742#ifdef VMS
743#include <descrip.h>
744#include <starlet.h>
745#endif
746
79072805 747int
864dbfa3 748Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 749{
27da23d5 750 dVAR;
eb578fdb
KW		 751 I32 paren;
752 const char *s = NULL;
753 REGEXP *rx;
823a54a3
AL		 754 const char * const remaining = mg->mg_ptr + 1;
755 const char nextchar = *remaining;
79072805 756
7918f24d
NC		 757 PERL_ARGS_ASSERT_MAGIC_GET;
758
79072805 759 switch (*mg->mg_ptr) {
748a9306 760 case '\001': /* ^A */
f2da823f
FC		 761 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
762 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT		 763 if (SvTAINTED(PL_bodytarget))
764 SvTAINTED_on(sv);
748a9306 765 break;
e5218da5 766 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 767 if (nextchar == '\0') {
e5218da5
GA		 768 sv_setiv(sv, (IV)PL_minus_c);
769 }
823a54a3 770 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA		 771 sv_setiv(sv, (IV)STATUS_NATIVE);
772 }
49460fe6
NIS		 773 break;
774
79072805 775 case '\004': /* ^D */
aea4f609 776 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 777 break;
28f23441 778 case '\005': /* ^E */
823a54a3 779 if (nextchar == '\0') {
e37778c2 780#if defined(VMS)
0a378802 781 {
0a378802
JH		 782 char msg[255];
783 $DESCRIPTOR(msgdsc,msg);
784 sv_setnv(sv,(NV) vaxc$errno);
785 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
786 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
787 else
76f68e9b 788 sv_setpvs(sv,"");
0a378802 789 }
4b645107 790#elif defined(OS2)
0a378802
JH		 791 if (!(_emx_env & 0x200)) { /* Under DOS */
792 sv_setnv(sv, (NV)errno);
793 sv_setpv(sv, errno ? Strerror(errno) : "");
794 } else {
795 if (errno != errno_isOS2) {
823a54a3 796 const int tmp = _syserrno();
0a378802
JH		 797 if (tmp) /* 2nd call to _syserrno() makes it 0 */
798 Perl_rc = tmp;
799 }
800 sv_setnv(sv, (NV)Perl_rc);
801 sv_setpv(sv, os2error(Perl_rc));
802 }
4b645107 803#elif defined(WIN32)
0a378802 804 {
d4c19fe8 805 const DWORD dwErr = GetLastError();
0a378802 806 sv_setnv(sv, (NV)dwErr);
823a54a3 807 if (dwErr) {
0a378802
JH		 808 PerlProc_GetOSError(sv, dwErr);
809 }
810 else
76f68e9b 811 sv_setpvs(sv, "");
0a378802
JH		 812 SetLastError(dwErr);
813 }
22fae026 814#else
f6c8f21d 815 {
4ee39169 816 dSAVE_ERRNO;
f6c8f21d 817 sv_setnv(sv, (NV)errno);
666ea192 818 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 819 RESTORE_ERRNO;
f6c8f21d 820 }
28f23441 821#endif
ad3296c6 822 SvRTRIM(sv);
0a378802
JH		 823 SvNOK_on(sv); /* what a wonderful hack! */
824 }
823a54a3 825 else if (strEQ(remaining, "NCODING"))
0a378802
JH		 826 sv_setsv(sv, PL_encoding);
827 break;
79072805 828 case '\006': /* ^F */
3280af22 829 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 830 break;
9ebf26ad
FR		 831 case '\007': /* ^GLOBAL_PHASE */
832 if (strEQ(remaining, "LOBAL_PHASE")) {
833 sv_setpvn(sv, PL_phase_names[PL_phase],
834 strlen(PL_phase_names[PL_phase]));
835 }
836 break;
a0d0e21e 837 case '\010': /* ^H */
3280af22 838 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 839 break;
9d116dd7 840 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 841 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 842 break;
8561ea1d
FC		 843 case '\014': /* ^LAST_FH */
844 if (strEQ(remaining, "AST_FH")) {
845 if (PL_last_in_gv) {
846 assert(isGV_with_GP(PL_last_in_gv));
847 SV_CHECK_THINKFIRST_COW_DROP(sv);
848 prepare_SV_for_RV(sv);
849 SvOK_off(sv);
850 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
851 SvROK_on(sv);
852 sv_rvweaken(sv);
853 }
854 else sv_setsv_nomg(sv, NULL);
855 }
856 break;
ac27b0f5 857 case '\017': /* ^O & ^OPEN */
823a54a3 858 if (nextchar == '\0') {
ac27b0f5 859 sv_setpv(sv, PL_osname);
3511154c
DM		 860 SvTAINTED_off(sv);
861 }
823a54a3 862 else if (strEQ(remaining, "PEN")) {
8b850bd5 863 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 864 }
28f23441 865 break;
9ebf26ad 866 case '\020':
cde0cee5
YO		 867 if (nextchar == '\0') { /* ^P */
868 sv_setiv(sv, (IV)PL_perldb);
869 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2c7b5d76
DM		 870
871 paren = RX_BUFF_IDX_CARET_PREMATCH;
872 goto do_numbuf_fetch;
cde0cee5 873 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2c7b5d76
DM		 874 paren = RX_BUFF_IDX_CARET_POSTMATCH;
875 goto do_numbuf_fetch;
cde0cee5 876 }
79072805 877 break;
fb73857a 878 case '\023': /* ^S */
823a54a3 879 if (nextchar == '\0') {
bc177e6b 880 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 881 SvOK_off(sv);
3280af22 882 else if (PL_in_eval)
6dc8a9e4 883 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS		 884 else
885 sv_setiv(sv, 0);
d58bf5aa 886 }
fb73857a 887 break;
79072805 888 case '\024': /* ^T */
823a54a3 889 if (nextchar == '\0') {
88e89b8a 890#ifdef BIG_TIME
7c36658b 891 sv_setnv(sv, PL_basetime);
88e89b8a 892#else
7c36658b 893 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 894#endif
7c36658b 895 }
823a54a3 896 else if (strEQ(remaining, "AINT"))
284167a5
S		 897 sv_setiv(sv, TAINTING_get
898 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 899 : 0);
7c36658b 900 break;
e07ea26a 901 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 902 if (strEQ(remaining, "NICODE"))
a05d7ebb 903 sv_setuv(sv, (UV) PL_unicode);
823a54a3 904 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 905 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC		 906 else if (strEQ(remaining, "TF8CACHE"))
907 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH		 908 break;
909 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 910 if (nextchar == '\0')
4438c4b7 911 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 912 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 913 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 914 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS		 915 }
916 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC		 917 sv_setsv(sv, &PL_sv_undef);
918 break;
013b78e8 919 }
d3a7d8c7 920 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS		 921 /* Get the bit mask for $warnings::Bits{all}, because
922 * it could have been extended by warnings::register */
4bac9ae4
CS		 923 HV * const bits = get_hv("warnings::Bits", 0);
924 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
925 if (bits_all)
926 sv_copypv(sv, *bits_all);
927 else
928 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 929 }
4438c4b7 930 else {
72dc9ed5
NC		 931 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
932 *PL_compiling.cop_warnings);
ac27b0f5 933 }
4438c4b7 934 }
79072805 935 break;
cde0cee5
YO		 936 case '\015': /* $^MATCH */
937 if (strEQ(remaining, "ATCH")) {
2c7b5d76
DM		 938 paren = RX_BUFF_IDX_CARET_FULLMATCH;
939 goto do_numbuf_fetch;
940 }
941
79072805
LW		 942 case '1': case '2': case '3': case '4':
943 case '5': case '6': case '7': case '8': case '9': case '&':
2c7b5d76
DM		 944 /*
945 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
946 * XXX Does the new way break anything?
947 */
948 paren = atoi(mg->mg_ptr); /* $& is in [0] */
949 do_numbuf_fetch:
950 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
951 CALLREG_NUMBUF_FETCH(rx,paren,sv);
952 break;
953 }
954 sv_setsv(sv,&PL_sv_undef);
79072805
LW		 955 break;
956 case '+':
aaa362c4 957 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM		 958 paren = RX_LASTPAREN(rx);
959 if (paren)
960 goto do_numbuf_fetch;
79072805 961 }
3280af22 962 sv_setsv(sv,&PL_sv_undef);
79072805 963 break;
a01268b5
JH		 964 case '\016': /* ^N */
965 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM		 966 paren = RX_LASTCLOSEPAREN(rx);
967 if (paren)
968 goto do_numbuf_fetch;
a01268b5
JH		 969 }
970 sv_setsv(sv,&PL_sv_undef);
971 break;
79072805 972 case '`':
2c7b5d76
DM		 973 paren = RX_BUFF_IDX_PREMATCH;
974 goto do_numbuf_fetch;
79072805 975 case '\'':
2c7b5d76
DM		 976 paren = RX_BUFF_IDX_POSTMATCH;
977 goto do_numbuf_fetch;
79072805 978 case '.':
3280af22 979 if (GvIO(PL_last_in_gv)) {
357c8808 980 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 981 }
79072805
LW		 982 break;
983 case '?':
809a5acc 984 {
809a5acc 985 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 986#ifdef COMPLEX_STATUS
41cb7b2b 987 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 988 LvTARGOFF(sv) = PL_statusvalue;
989 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 990#endif
809a5acc 991 }
79072805
LW		 992 break;
993 case '^':
acbe1b9d 994 if (GvIOp(PL_defoutgv))
099be4f1 995 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW		 996 if (s)
997 sv_setpv(sv,s);
998 else {
3280af22 999 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1000 sv_catpvs(sv,"_TOP");
79072805
LW		 1001 }
1002 break;
1003 case '~':
acbe1b9d 1004 if (GvIOp(PL_defoutgv))
0daa599b 1005 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1006 if (!s)
3280af22 1007 s = GvENAME(PL_defoutgv);
79072805
LW		 1008 sv_setpv(sv,s);
1009 break;
79072805 1010 case '=':
099be4f1 1011 if (GvIO(PL_defoutgv))
0daa599b 1012 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW		 1013 break;
1014 case '-':
099be4f1 1015 if (GvIO(PL_defoutgv))
0daa599b 1016 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW		 1017 break;
1018 case '%':
099be4f1 1019 if (GvIO(PL_defoutgv))
0daa599b 1020 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1021 break;
79072805
LW		 1022 case ':':
1023 break;
1024 case '/':
1025 break;
1026 case '[':
e1dccc0d 1027 sv_setiv(sv, 0);
79072805
LW		 1028 break;
1029 case '|':
099be4f1 1030 if (GvIO(PL_defoutgv))
0daa599b 1031 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1032 break;
79072805 1033 case '\\':
b2ce0fda 1034 if (PL_ors_sv)
f28098ff 1035 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS		 1036 else
1037 sv_setsv(sv, &PL_sv_undef);
79072805 1038 break;
0e219455 1039 case '$': /* $$ */
9cdac2a2
FC		 1040 {
1041 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1042 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC		 1043 /* never set manually, or at least not since last fork */
1044 sv_setiv(sv, pid);
19db9fb7
Z		 1045 /* never unsafe, even if reading in a tainted expression */
1046 SvTAINTED_off(sv);
1047 }
9cdac2a2
FC		 1048 /* else a value has been assigned manually, so do nothing */
1049 }
0e219455
MM		 1050 break;
1051
79072805 1052 case '!':
666d8aa2
CB		 1053 {
1054 dSAVE_ERRNO;
a5f75d66 1055#ifdef VMS
65202027 1056 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
a5f75d66 1057#else
65202027 1058 sv_setnv(sv, (NV)errno);
666d8aa2 1059#endif
88e89b8a 1060#ifdef OS2
ed344e4f
IZ		 1061 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1062 sv_setpv(sv, os2error(Perl_rc));
88e89b8a 1063 else
a5f75d66 1064#endif
1500bd91
KW		 1065 if (! errno) {
1066 sv_setpvs(sv, "");
1067 }
1068 else {
1069
1070 /* Strerror can return NULL on some platforms, which will result in
1071 * 'sv' not being considered SvOK. The SvNOK_on() below will cause
1072 * just the number part to be valid */
1073 sv_setpv(sv, Strerror(errno));
1074
1075 /* In some locales the error string may come back as UTF-8, in
1076 * which case we should turn on that flag. This didn't use to
1077 * happen, and to avoid any possible backward compatibility issues,
1078 * we don't turn on the flag unless we have to. So the flag stays
1079 * off for an entirely ASCII string. We assume that if the string
1080 * looks like UTF-8, it really is UTF-8: "text in any other
1081 * encoding that uses bytes with the high bit set is extremely
1082 * unlikely to pass a UTF-8 validity test"
1083 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
1084 * potential that we will get it wrong however, especially on short
1085 * error message text. (If it turns out to be necessary, we could
1086 * also keep track if the current LC_MESSAGES locale is UTF-8) */
1087 if (SvOK(sv) /* It could be that Strerror returned invalid */
1088 && ! is_ascii_string((U8*) SvPVX_const(sv), SvCUR(sv))
1089 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
1090 {
1091 SvUTF8_on(sv);
1092 }
1093 }
4ee39169 1094 RESTORE_ERRNO;
88e89b8a 1095 }
666d8aa2 1096
ad3296c6 1097 SvRTRIM(sv);
946ec16e 1098 SvNOK_on(sv); /* what a wonderful hack! */
79072805
LW		 1099 break;
1100 case '<':
dfff4baf 1101 sv_setuid(sv, PerlProc_getuid());
79072805
LW		 1102 break;
1103 case '>':
dfff4baf 1104 sv_setuid(sv, PerlProc_geteuid());
79072805
LW		 1105 break;
1106 case '(':
dfff4baf 1107 sv_setgid(sv, PerlProc_getgid());
79072805
LW		 1108 goto add_groups;
1109 case ')':
dfff4baf 1110 sv_setgid(sv, PerlProc_getegid());
79072805 1111 add_groups:
79072805 1112#ifdef HAS_GETGROUPS
79072805 1113 {
57d7c65e 1114 Groups_t *gary = NULL;
fb45abb2 1115 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC		 1116 Newx(gary, num_groups, Groups_t);
1117 num_groups = getgroups(num_groups, gary);
fb45abb2
GA		 1118 for (i = 0; i < num_groups; i++)
1119 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1120 Safefree(gary);
79072805 1121 }
155aba94 1122 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1123#endif
79072805 1124 break;
79072805
LW		 1125 case '0':
1126 break;
1127 }
a0d0e21e 1128 return 0;
79072805
LW		 1129}
1130
1131int
864dbfa3 1132Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1133{
8772537c 1134 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1135
7918f24d
NC		 1136 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1137
79072805 1138 if (uf && uf->uf_val)
24f81a43 1139 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW		 1140 return 0;
1141}
1142
1143int
864dbfa3 1144Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1145{
27da23d5 1146 dVAR;
9ae3433d 1147 STRLEN len = 0, klen;
12033064 1148 const char * const key = MgPV_const(mg,klen);
888a67f6 1149 const char *s = "";
1e422769 1150
7918f24d
NC		 1151 PERL_ARGS_ASSERT_MAGIC_SETENV;
1152
613c63b4 1153 SvGETMAGIC(sv);
12033064 1154 if (SvOK(sv)) {
613c63b4
CS		 1155 /* defined environment variables are byte strings; unfortunately
1156 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1157 (void)SvPV_force_nomg_nolen(sv);
1158 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1159 if (SvUTF8(sv)) {
1160 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1161 SvUTF8_off(sv);
1162 }
1163 s = SvPVX(sv);
1164 len = SvCUR(sv);
12033064
CS		 1165 }
1166 my_setenv(key, s); /* does the deed */
1167
a0d0e21e
LW		 1168#ifdef DYNAMIC_ENV_FETCH
1169 /* We just undefd an environment var. Is a replacement */
1170 /* waiting in the wings? */
1171 if (!len) {
6bd66ee9 1172 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1173 if (valp)
4ab59fcc 1174 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW		 1175 }
1176#endif
1e422769 1177
39e571d4 1178#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW		 1179 /* And you'll never guess what the dog had */
1180 /* in its mouth... */
284167a5 1181 if (TAINTING_get) {
1e422769 1182 MgTAINTEDDIR_off(mg);
1183#ifdef VMS
6bd66ee9 1184 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1185 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769 1186 int i = 0, j = 0;
1187
6fca0082 1188 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1189 elt = eltbuf;
1e422769 1190 do { /* DCL$PATH may be a search list */
1191 while (1) { /* as may dev portion of any element */
1192 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1193 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1194 cando_by_name(S_IWUSR,0,elt) ) {
1195 MgTAINTEDDIR_on(mg);
1196 return 0;
1197 }
1198 }
bd61b366 1199 if ((cp = strchr(elt, ':')) != NULL)
1e422769 1200 *cp = '\0';
1201 if (my_trnlnm(elt, eltbuf, j++))
1202 elt = eltbuf;
1203 else
1204 break;
1205 }
1206 j = 0;
1207 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1208 }
1209#endif /* VMS */
12033064 1210 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1211 const char * const strend = s + len;
463ee0b2
LW		 1212
1213 while (s < strend) {
96827780 1214 char tmpbuf[256];
c623ac67 1215 Stat_t st;
5f74f29c 1216 I32 i;
f5a63d97
AL		 1217#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1218 const char path_sep = '|';
1219#else
1220 const char path_sep = ':';
1221#endif
96827780 1222 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1223 s, strend, path_sep, &i);
463ee0b2 1224 s++;
bb7a0f54 1225 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB		 1226#ifdef VMS
1227 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1228#else
1229 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1230#endif
c6ed36e1 1231 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1232 MgTAINTEDDIR_on(mg);
1e422769 1233 return 0;
1234 }
463ee0b2 1235 }
79072805
LW		 1236 }
1237 }
39e571d4 1238#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1239
79072805
LW		 1240 return 0;
1241}
1242
1243int
864dbfa3 1244Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1245{
7918f24d 1246 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1247 PERL_UNUSED_ARG(sv);
bd61b366 1248 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW		 1249 return 0;
1250}
1251
88e89b8a 1252int
864dbfa3 1253Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1254{
97aff369 1255 dVAR;
7918f24d 1256 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1257 PERL_UNUSED_ARG(mg);
b0269e46 1258#if defined(VMS)
cea2e8a9 1259 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1260#else
3280af22 1261 if (PL_localizing) {
fb73857a 1262 HE* entry;
b0269e46 1263 my_clearenv();
85fbaab2
NC		 1264 hv_iterinit(MUTABLE_HV(sv));
1265 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a 1266 I32 keylen;
1267 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1268 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a 1269 }
1270 }
1271#endif
1272 return 0;
1273}
1274
1275int
864dbfa3 1276Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1277{
27da23d5 1278 dVAR;
7918f24d 1279 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL		 1280 PERL_UNUSED_ARG(sv);
1281 PERL_UNUSED_ARG(mg);
b0269e46
AB		 1282#if defined(VMS)
1283 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1284#else
1285 my_clearenv();
1286#endif
3e3baf6d 1287 return 0;
66b1d557
HM		 1288}
1289
64ca3a65 1290#ifndef PERL_MICRO
2d4fcd5e
AJ		 1291#ifdef HAS_SIGPROCMASK
1292static void
1293restore_sigmask(pTHX_ SV *save_sv)
1294{
0bd48802 1295 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1296 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ		 1297}
1298#endif
66b1d557 1299int
864dbfa3 1300Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1301{
97aff369 1302 dVAR;
88e89b8a 1303 /* Are we fetching a signal entry? */
708854f2 1304 int i = (I16)mg->mg_private;
7918f24d
NC		 1305
1306 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1307
708854f2 1308 if (!i) {
84c7b88c
BF		 1309 STRLEN siglen;
1310 const char * sig = MgPV_const(mg, siglen);
1311 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC		 1312 }
1313
e02bfb16 1314 if (i > 0) {
22c35a8c
GS		 1315 if(PL_psig_ptr[i])
1316 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1317 else {
46da273f 1318 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1319#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL		 1320 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1321 sigstate = SIG_IGN;
2e34cc90
CL		 1322#endif
1323#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL		 1324 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1325 sigstate = SIG_DFL;
85b332e2 1326#endif
88e89b8a 1327 /* cache state so we don't fetch it again */
8aad04aa 1328 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1329 sv_setpvs(sv,"IGNORE");
88e89b8a 1330 else
3280af22 1331 sv_setsv(sv,&PL_sv_undef);
46da273f 1332 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a 1333 SvTEMP_off(sv);
1334 }
1335 }
1336 return 0;
1337}
1338int
864dbfa3 1339Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1340{
7918f24d 1341 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1342
38a124f0 1343 magic_setsig(NULL, mg);
179c85a2 1344 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1345}
3d37d572 1346
0a8e0eff 1347Signal_t
8aad04aa 1348#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1349Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1350#else
0a8e0eff 1351Perl_csighandler(int sig)
8aad04aa 1352#endif
0a8e0eff 1353{
1018e26f
NIS		 1354#ifdef PERL_GET_SIG_CONTEXT
1355 dTHXa(PERL_GET_SIG_CONTEXT);
1356#else
85b332e2
CL		 1357 dTHX;
1358#endif
23ada85b 1359#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1360 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1361 if (PL_sig_ignoring[sig]) return;
85b332e2 1362#endif
2e34cc90 1363#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1364 if (PL_sig_defaulting[sig])
2e34cc90
CL		 1365#ifdef KILL_BY_SIGPRC
1366 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1367#else
1368 exit(1);
1369#endif
1370#endif
406878dd 1371 if (
853d2c32
RGS		 1372#ifdef SIGILL
1373 sig == SIGILL ||
1374#endif
1375#ifdef SIGBUS
1376 sig == SIGBUS ||
1377#endif
1378#ifdef SIGSEGV
1379 sig == SIGSEGV ||
1380#endif
1381 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1382 /* Call the perl level handler now--
31c91b43 1383 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1384#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1385 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1386#else
1387 (*PL_sighandlerp)(sig);
92807b6d 1388#endif
406878dd 1389 else {
31c91b43 1390 if (!PL_psig_pend) return;
406878dd
GA		 1391 /* Set a flag to say this signal is pending, that is awaiting delivery after
1392 * the current Perl opcode completes */
1393 PL_psig_pend[sig]++;
1394
1395#ifndef SIG_PENDING_DIE_COUNT
1396# define SIG_PENDING_DIE_COUNT 120
1397#endif
fe13d51d 1398 /* Add one to say _a_ signal is pending */
406878dd
GA		 1399 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1400 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1401 (unsigned long)SIG_PENDING_DIE_COUNT);
1402 }
0a8e0eff
NIS		 1403}
1404
2e34cc90
CL		 1405#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1406void
1407Perl_csighandler_init(void)
1408{
1409 int sig;
27da23d5 1410 if (PL_sig_handlers_initted) return;
2e34cc90
CL		 1411
1412 for (sig = 1; sig < SIG_SIZE; sig++) {
1413#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1414 dTHX;
27da23d5 1415 PL_sig_defaulting[sig] = 1;
5c1546dc 1416 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL		 1417#endif
1418#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1419 PL_sig_ignoring[sig] = 0;
2e34cc90
CL		 1420#endif
1421 }
27da23d5 1422 PL_sig_handlers_initted = 1;
2e34cc90
CL		 1423}
1424#endif
1425
7fe50b8b
LT		 1426#if defined HAS_SIGPROCMASK
1427static void
1428unblock_sigmask(pTHX_ void* newset)
1429{
1430 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1431}
1432#endif
1433
0a8e0eff
NIS		 1434void
1435Perl_despatch_signals(pTHX)
1436{
97aff369 1437 dVAR;
0a8e0eff
NIS		 1438 int sig;
1439 PL_sig_pending = 0;
1440 for (sig = 1; sig < SIG_SIZE; sig++) {
1441 if (PL_psig_pend[sig]) {
d0166017 1442 dSAVE_ERRNO;
7fe50b8b 1443#ifdef HAS_SIGPROCMASK
55534442
LT		 1444 /* From sigaction(2) (FreeBSD man page):
1445 * | Signal routines normally execute with the signal that
1446 * | caused their invocation blocked, but other signals may
1447 * | yet occur.
1448 * Emulation of this behavior (from within Perl) is enabled
1449 * using sigprocmask
1450 */
1451 int was_blocked;
1452 sigset_t newset, oldset;
1453
1454 sigemptyset(&newset);
1455 sigaddset(&newset, sig);
1456 sigprocmask(SIG_BLOCK, &newset, &oldset);
1457 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT		 1458 if (!was_blocked) {
1459 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1460 ENTER;
1461 SAVEFREESV(save_sv);
1462 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1463 }
55534442 1464#endif
25da4428 1465 PL_psig_pend[sig] = 0;
6e324d09 1466#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1467 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1468#else
1469 (*PL_sighandlerp)(sig);
92807b6d 1470#endif
7fe50b8b 1471#ifdef HAS_SIGPROCMASK
55534442 1472 if (!was_blocked)
7fe50b8b 1473 LEAVE;
55534442 1474#endif
d0166017 1475 RESTORE_ERRNO;
0a8e0eff
NIS		 1476 }
1477 }
1478}
1479
38a124f0 1480/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1481int
864dbfa3 1482Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1483{
27da23d5 1484 dVAR;
79072805 1485 I32 i;
cbbf8932 1486 SV** svp = NULL;
2d4fcd5e
AJ		 1487 /* Need to be careful with SvREFCNT_dec(), because that can have side
1488 * effects (due to closures). We must make sure that the new disposition
1489 * is in place before it is called.
1490 */
cbbf8932 1491 SV* to_dec = NULL;
e72dc28c 1492 STRLEN len;
2d4fcd5e
AJ		 1493#ifdef HAS_SIGPROCMASK
1494 sigset_t set, save;
1495 SV* save_sv;
1496#endif
eb578fdb 1497 const char *s = MgPV_const(mg,len);
7918f24d
NC		 1498
1499 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1500
748a9306 1501 if (*s == '_') {
84c7b88c 1502 if (memEQs(s, len, "__DIE__"))
3280af22 1503 svp = &PL_diehook;
84c7b88c 1504 else if (memEQs(s, len, "__WARN__")
38a124f0
NC		 1505 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1506 /* Merge the existing behaviours, which are as follows:
1507 magic_setsig, we always set svp to &PL_warnhook
1508 (hence we always change the warnings handler)
1509 For magic_clearsig, we don't change the warnings handler if it's
1510 set to the &PL_warnhook. */
3280af22 1511 svp = &PL_warnhook;
84c7b88c
BF		 1512 } else if (sv) {
1513 SV *tmp = sv_newmortal();
1514 Perl_croak(aTHX_ "No such hook: %s",
1515 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1516 }
748a9306 1517 i = 0;
38a124f0 1518 if (svp && *svp) {
9289f461
RGS		 1519 if (*svp != PERL_WARNHOOK_FATAL)
1520 to_dec = *svp;
cbbf8932 1521 *svp = NULL;
4633a7c4 1522 }
748a9306
LW		 1523 }
1524 else {
708854f2
NC		 1525 i = (I16)mg->mg_private;
1526 if (!i) {
84c7b88c 1527 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1528 mg->mg_private = (U16)i;
708854f2 1529 }
86d86cad 1530 if (i <= 0) {
84c7b88c
BF		 1531 if (sv) {
1532 SV *tmp = sv_newmortal();
1533 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1534 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1535 }
748a9306
LW		 1536 return 0;
1537 }
2d4fcd5e
AJ		 1538#ifdef HAS_SIGPROCMASK
1539 /* Avoid having the signal arrive at a bad time, if possible. */
1540 sigemptyset(&set);
1541 sigaddset(&set,i);
1542 sigprocmask(SIG_BLOCK, &set, &save);
1543 ENTER;
9ff8e806 1544 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ		 1545 SAVEFREESV(save_sv);
1546 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1547#endif
1548 PERL_ASYNC_CHECK();
2e34cc90 1549#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1550 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1551#endif
23ada85b 1552#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1553 PL_sig_ignoring[i] = 0;
85b332e2 1554#endif
2e34cc90 1555#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1556 PL_sig_defaulting[i] = 0;
2e34cc90 1557#endif
2d4fcd5e 1558 to_dec = PL_psig_ptr[i];
38a124f0
NC		 1559 if (sv) {
1560 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1561 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC		 1562
1563 /* Signals don't change name during the program's execution, so once
1564 they're cached in the appropriate slot of PL_psig_name, they can
1565 stay there.
1566
1567 Ideally we'd find some way of making SVs at (C) compile time, or
1568 at least, doing most of the work. */
1569 if (!PL_psig_name[i]) {
1570 PL_psig_name[i] = newSVpvn(s, len);
1571 SvREADONLY_on(PL_psig_name[i]);
1572 }
38a124f0 1573 } else {
79fd3822 1574 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC		 1575 PL_psig_name[i] = NULL;
1576 PL_psig_ptr[i] = NULL;
1577 }
748a9306 1578 }
38a124f0 1579 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1580 if (i) {
5c1546dc 1581 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1582 }
748a9306 1583 else
b37c2d43 1584 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1585 } else {
9dfa190b
NC		 1586 if (sv && SvOK(sv)) {
1587 s = SvPV_force(sv, len);
1588 } else {
1589 sv = NULL;
1590 }
84c7b88c 1591 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1592 if (i) {
23ada85b 1593#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC		 1594 PL_sig_ignoring[i] = 1;
1595 (void)rsignal(i, PL_csighandlerp);
85b332e2 1596#else
9dfa190b 1597 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1598#endif
9dfa190b 1599 }
2d4fcd5e 1600 }
84c7b88c 1601 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1602 if (i) {
2e34cc90 1603#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC		 1604 PL_sig_defaulting[i] = 1;
1605 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1606#else
9dfa190b 1607 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1608#endif
9dfa190b
NC		 1609 }
1610 }
1611 else {
1612 /*
1613 * We should warn if HINT_STRICT_REFS, but without
1614 * access to a known hint bit in a known OP, we can't
1615 * tell whether HINT_STRICT_REFS is in force or not.
1616 */
1617 if (!strchr(s,':') && !strchr(s,'\''))
1618 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1619 SV_GMAGIC);
1620 if (i)
1621 (void)rsignal(i, PL_csighandlerp);
1622 else
1623 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1624 }
748a9306 1625 }
9dfa190b 1626
2d4fcd5e
AJ		 1627#ifdef HAS_SIGPROCMASK
1628 if(i)
1629 LEAVE;
1630#endif
ef8d46e8 1631 SvREFCNT_dec(to_dec);
79072805
LW		 1632 return 0;
1633}
64ca3a65 1634#endif /* !PERL_MICRO */
79072805
LW		 1635
1636int
864dbfa3 1637Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1638{
97aff369 1639 dVAR;
7918f24d 1640 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1641 PERL_UNUSED_ARG(sv);
e1a479c5 1642
89c14e2e 1643 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1644 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB		 1645 return 0;
1646
0e446081 1647 return magic_clearisa(NULL, mg);
463ee0b2
LW		 1648}
1649
0e446081 1650/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1651int
52b45067
RD		 1652Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1653{
1654 dVAR;
1655 HV* stash;
1656
7918f24d
NC		 1657 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1658
52b45067 1659 /* Bail out if destruction is going on */
627364f1 1660 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1661
0e446081
NC		 1662 if (sv)
1663 av_clear(MUTABLE_AV(sv));
52b45067 1664
6624142a
FC		 1665 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1666 /* This occurs with setisa_elem magic, which calls this
1667 same function. */
1668 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1669
1670 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1671 SV **svp = AvARRAY((AV *)mg->mg_obj);
1672 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1673 while (items--) {
1674 stash = GvSTASH((GV *)*svp++);
1675 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1676 }
1677
1678 return 0;
1679 }
1680
52b45067 1681 stash = GvSTASH(
6624142a 1682 (const GV *)mg->mg_obj
52b45067
RD		 1683 );
1684
00169e2c
FC		 1685 /* The stash may have been detached from the symbol table, so check its
1686 name before doing anything. */
1687 if (stash && HvENAME_get(stash))
5562fa71 1688 mro_isa_changed_in(stash);
52b45067
RD		 1689
1690 return 0;
1691}
1692
1693int
864dbfa3 1694Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1695{
85fbaab2 1696 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1697 I32 i = 0;
7918f24d
NC		 1698
1699 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1700 PERL_UNUSED_ARG(mg);
7719e241 1701
6ff81951 1702 if (hv) {
497b47a8 1703 (void) hv_iterinit(hv);
ad64d0ec 1704 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1705 i = HvUSEDKEYS(hv);
497b47a8
JH		 1706 else {
1707 while (hv_iternext(hv))
1708 i++;
1709 }
6ff81951
GS		 1710 }
1711
1712 sv_setiv(sv, (IV)i);
1713 return 0;
1714}
1715
1716int
864dbfa3 1717Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1718{
7918f24d 1719 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1720 PERL_UNUSED_ARG(mg);
946ec16e 1721 if (LvTARG(sv)) {
85fbaab2 1722 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e 1723 }
1724 return 0;
ac27b0f5 1725}
946ec16e 1726
efaf3674
DM		 1727/*
1728=for apidoc magic_methcall
1729
1730Invoke a magic method (like FETCH).
1731
2baee27b
FC		 1732C<sv> and C<mg> are the tied thingy and the tie magic.
1733
1734C<meth> is the name of the method to call.
1735
1736C<argc> is the number of args (in addition to $self) to pass to the method.
1737
1738The C<flags> can be:
1739
1740 G_DISCARD invoke method with G_DISCARD flag and don't
1741 return a value
1742 G_UNDEF_FILL fill the stack with argc pointers to
1743 PL_sv_undef
1744
1745The arguments themselves are any values following the C<flags> argument.
efaf3674
DM		 1746
1747Returns the SV (if any) returned by the method, or NULL on failure.
1748
1749
1750=cut
1751*/
1752
1753SV*
36925d9e 1754Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1755 U32 argc, ...)
a0d0e21e 1756{
97aff369 1757 dVAR;
a0d0e21e 1758 dSP;
efaf3674 1759 SV* ret = NULL;
463ee0b2 1760
7918f24d
NC		 1761 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1762
efaf3674 1763 ENTER;
d1d7a15d
NC		 1764
1765 if (flags & G_WRITING_TO_STDERR) {
1766 SAVETMPS;
1767
1768 save_re_context();
1769 SAVESPTR(PL_stderrgv);
1770 PL_stderrgv = NULL;
1771 }
1772
efaf3674 1773 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1774 PUSHMARK(SP);
efaf3674 1775
67549bd2
NC		 1776 EXTEND(SP, argc+1);
1777 PUSHs(SvTIED_obj(sv, mg));
1778 if (flags & G_UNDEF_FILL) {
1779 while (argc--) {
efaf3674 1780 PUSHs(&PL_sv_undef);
93965878 1781 }
67549bd2 1782 } else if (argc > 0) {
046b0c7d
NC		 1783 va_list args;
1784 va_start(args, argc);
1785
1786 do {
1787 SV *const sv = va_arg(args, SV *);
1788 PUSHs(sv);
1789 } while (--argc);
1790
1791 va_end(args);
88e89b8a 1792 }
463ee0b2 1793 PUTBACK;
efaf3674 1794 if (flags & G_DISCARD) {
36925d9e 1795 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM		 1796 }
1797 else {
36925d9e 1798 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM		 1799 ret = *PL_stack_sp--;
1800 }
1801 POPSTACK;
d1d7a15d
NC		 1802 if (flags & G_WRITING_TO_STDERR)
1803 FREETMPS;
efaf3674
DM		 1804 LEAVE;
1805 return ret;
1806}
1807
efaf3674 1808/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1809
efaf3674 1810STATIC SV*
36925d9e 1811S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM		 1812 int n, SV *val)
1813{
1814 dVAR;
1815 SV* arg1 = NULL;
1816
1817 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1818
1819 if (mg->mg_ptr) {
1820 if (mg->mg_len >= 0) {
db4b3a1d 1821 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM		 1822 }
1823 else if (mg->mg_len == HEf_SVKEY)
1824 arg1 = MUTABLE_SV(mg->mg_ptr);
1825 }
1826 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1827 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM		 1828 sv_2mortal(arg1);
1829 }
1830 if (!arg1) {
046b0c7d 1831 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1832 }
046b0c7d 1833 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e 1834}
1835
76e3520e 1836STATIC int
36925d9e 1837S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1838{
efaf3674
DM		 1839 dVAR;
1840 SV* ret;
463ee0b2 1841
7918f24d
NC		 1842 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1843
efaf3674
DM		 1844 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1845 if (ret)
1846 sv_setsv(sv, ret);
a0d0e21e
LW		 1847 return 0;
1848}
463ee0b2 1849
a0d0e21e 1850int
864dbfa3 1851Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1852{
7918f24d
NC		 1853 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1854
fd69380d 1855 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1856 mg->mg_flags |= MGf_GSKIP;
36925d9e 1857 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW		 1858 return 0;
1859}
1860
1861int
864dbfa3 1862Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1863{
efaf3674 1864 dVAR;
b112cff9
DM		 1865 MAGIC *tmg;
1866 SV *val;
7918f24d
NC		 1867
1868 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1869
b112cff9
DM		 1870 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1871 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1872 * public flags indicate its value based on copying from $val. Doing
1873 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1874 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1875 * wrong if $val happened to be tainted, as sv hasn't got magic
1876 * enabled, even though taint magic is in the chain. In which case,
1877 * fake up a temporary tainted value (this is easier than temporarily
1878 * re-enabling magic on sv). */
1879
284167a5 1880 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM		 1881 && (tmg->mg_len & 1))
1882 {
1883 val = sv_mortalcopy(sv);
1884 SvTAINTED_on(val);
1885 }
1886 else
1887 val = sv;
1888
36925d9e 1889 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW		 1890 return 0;
1891}
1892
1893int
864dbfa3 1894Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1895{
7918f24d
NC		 1896 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1897
4c13be3f 1898 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1899 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1900}
463ee0b2 1901
93965878
NIS		 1902
1903U32
864dbfa3 1904Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1905{
efaf3674 1906 dVAR;
22846ab4 1907 I32 retval = 0;
efaf3674 1908 SV* retsv;
93965878 1909
7918f24d
NC		 1910 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1911
36925d9e 1912 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM		 1913 if (retsv) {
1914 retval = SvIV(retsv)-1;
22846ab4
AB		 1915 if (retval < -1)
1916 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1917 }
22846ab4 1918 return (U32) retval;
93965878
NIS		 1919}
1920
cea2e8a9
GS		 1921int
1922Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1923{
efaf3674 1924 dVAR;
463ee0b2 1925
7918f24d
NC		 1926 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1927
36925d9e 1928 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW		 1929 return 0;
1930}
1931
1932int
864dbfa3 1933Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1934{
efaf3674
DM		 1935 dVAR;
1936 SV* ret;
463ee0b2 1937
7918f24d
NC		 1938 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1939
36925d9e
RZ		 1940 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1941 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM		 1942 if (ret)
1943 sv_setsv(key,ret);
79072805
LW		 1944 return 0;
1945}
1946
1947int
1146e912 1948Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1949{
7918f24d
NC		 1950 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1951
36925d9e 1952 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1953}
a0d0e21e 1954
a3bcc51e
TP		 1955SV *
1956Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1957{
efaf3674 1958 dVAR;
5fcbf73d 1959 SV *retval;
ad64d0ec
NC		 1960 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1961 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1962
7918f24d
NC		 1963 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1964
a3bcc51e
TP		 1965 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1966 SV *key;
bfcb3514 1967 if (HvEITER_get(hv))
a3bcc51e
TP		 1968 /* we are in an iteration so the hash cannot be empty */
1969 return &PL_sv_yes;
1970 /* no xhv_eiter so now use FIRSTKEY */
1971 key = sv_newmortal();
ad64d0ec 1972 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1973 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP		 1974 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1975 }
1976
1977 /* there is a SCALAR method that we can call */
36925d9e 1978 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1979 if (!retval)
5fcbf73d 1980 retval = &PL_sv_undef;
a3bcc51e
TP		 1981 return retval;
1982}
1983
a0d0e21e 1984int
864dbfa3 1985Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1986{
97aff369 1987 dVAR;
8772537c
AL		 1988 GV * const gv = PL_DBline;
1989 const I32 i = SvTRUE(sv);
1990 SV ** const svp = av_fetch(GvAV(gv),
01b8bcb7 1991 atoi(MgPV_nolen_const(mg)), FALSE);
7918f24d
NC		 1992
1993 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1994
8772537c
AL		 1995 if (svp && SvIOKp(*svp)) {
1996 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1997 if (o) {
7bbbc3c0
NC		 1998#ifdef PERL_DEBUG_READONLY_OPS
1999 Slab_to_rw(OpSLAB(o));
2000#endif
8772537c
AL		 2001 /* set or clear breakpoint in the relevant control op */
2002 if (i)
2003 o->op_flags |= OPf_SPECIAL;
2004 else
2005 o->op_flags &= ~OPf_SPECIAL;
7bbbc3c0
NC		 2006#ifdef PERL_DEBUG_READONLY_OPS
2007 Slab_to_ro(OpSLAB(o));
2008#endif
8772537c 2009 }
5df8de69 2010 }
79072805
LW		 2011 return 0;
2012}
2013
2014int
8772537c 2015Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2016{
97aff369 2017 dVAR;
502c6561 2018 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2019
2020 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2021
83bf042f 2022 if (obj) {
e1dccc0d 2023 sv_setiv(sv, AvFILL(obj));
83bf042f 2024 } else {
d4a823b3 2025 sv_setsv(sv, NULL);
83bf042f 2026 }
79072805
LW		 2027 return 0;
2028}
2029
2030int
864dbfa3 2031Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2032{
97aff369 2033 dVAR;
502c6561 2034 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2035
2036 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2037
83bf042f 2038 if (obj) {
e1dccc0d 2039 av_fill(obj, SvIV(sv));
83bf042f 2040 } else {
a2a5de95
NC		 2041 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2042 "Attempt to set length of freed array");
83bf042f
NC		 2043 }
2044 return 0;
2045}
2046
2047int
83f29afa
VP		 2048Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2049{
2050 dVAR;
2051
2052 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2053 PERL_UNUSED_ARG(sv);
2054
2055 /* Reset the iterator when the array is cleared */
3565fbf3
VP		 2056#if IVSIZE == I32SIZE
2057 *((IV *) &(mg->mg_len)) = 0;
2058#else
83f29afa
VP		 2059 if (mg->mg_ptr)
2060 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2061#endif
83f29afa
VP		 2062
2063 return 0;
2064}
2065
2066int
83bf042f
NC		 2067Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2068{
97aff369 2069 dVAR;
7918f24d
NC		 2070
2071 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2072 PERL_UNUSED_ARG(sv);
7918f24d 2073
94f3782b
DM		 2074 /* during global destruction, mg_obj may already have been freed */
2075 if (PL_in_clean_all)
1ea47f64 2076 return 0;
94f3782b 2077
83bf042f
NC		 2078 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2079
2080 if (mg) {
2081 /* arylen scalar holds a pointer back to the array, but doesn't own a
2082 reference. Hence the we (the array) are about to go away with it
2083 still pointing at us. Clear its pointer, else it would be pointing
2084 at free memory. See the comment in sv_magic about reference loops,
2085 and why it can't own a reference to us. */
2086 mg->mg_obj = 0;
2087 }
a0d0e21e
LW		 2088 return 0;
2089}
2090
2091int
864dbfa3 2092Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2093{
97aff369 2094 dVAR;
16eb5365 2095 SV* const lsv = LvTARG(sv);
96c2a8ff 2096 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC		 2097
2098 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2099 PERL_UNUSED_ARG(mg);
ac27b0f5 2100
6174b39a
FC		 2101 if (found && found->mg_len != -1) {
2102 STRLEN i = found->mg_len;
25fdce4a 2103 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC		 2104 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2105 sv_setuv(sv, i);
a0d0e21e 2106 return 0;
a0d0e21e 2107 }
35995e5c 2108 sv_setsv(sv,NULL);
a0d0e21e
LW		 2109 return 0;
2110}
2111
2112int
864dbfa3 2113Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2114{
97aff369 2115 dVAR;
16eb5365 2116 SV* const lsv = LvTARG(sv);
a0d0e21e
LW		 2117 SSize_t pos;
2118 STRLEN len;
c00206c8 2119 STRLEN ulen = 0;
53d44271 2120 MAGIC* found;
aec43834 2121 const char *s;
a0d0e21e 2122
7918f24d 2123 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2124 PERL_UNUSED_ARG(mg);
ac27b0f5 2125
96c2a8ff 2126 found = mg_find_mglob(lsv);
3881461a 2127 if (!found) {
a0d0e21e
LW		 2128 if (!SvOK(sv))
2129 return 0;
96c2a8ff 2130 found = sv_magicext_mglob(lsv);
a0d0e21e
LW		 2131 }
2132 else if (!SvOK(sv)) {
3881461a 2133 found->mg_len = -1;
a0d0e21e
LW		 2134 return 0;
2135 }
aec43834 2136 s = SvPV_const(lsv, len);
a0d0e21e 2137
e1dccc0d 2138 pos = SvIV(sv);
a0ed51b3 2139
7e2040f0 2140 if (DO_UTF8(lsv)) {
aec43834 2141 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW		 2142 if (ulen)
2143 len = ulen;
a0ed51b3
LW		 2144 }
2145
a0d0e21e
LW		 2146 if (pos < 0) {
2147 pos += len;
2148 if (pos < 0)
2149 pos = 0;
2150 }
eb160463 2151 else if (pos > (SSize_t)len)
a0d0e21e 2152 pos = len;
a0ed51b3 2153
3881461a 2154 found->mg_len = pos;
25fdce4a 2155 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2156
79072805
LW		 2157 return 0;
2158}
2159
2160int
864dbfa3 2161Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS		 2162{
2163 STRLEN len;
35a4481c 2164 SV * const lsv = LvTARG(sv);
b83604b4 2165 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB		 2166 STRLEN offs = LvTARGOFF(sv);
2167 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC		 2168 const bool negoff = LvFLAGS(sv) & 1;
2169 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC		 2170
2171 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2172 PERL_UNUSED_ARG(mg);
6ff81951 2173
83f78d1a 2174 if (!translate_substr_offsets(
4ddea69a 2175 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC		 2176 negoff ? -(IV)offs : (IV)offs, !negoff,
2177 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2178 )) {
2179 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2180 sv_setsv_nomg(sv, &PL_sv_undef);
2181 return 0;
2182 }
2183
9aa983d2 2184 if (SvUTF8(lsv))
4ddea69a 2185 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2186 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2187 if (SvUTF8(lsv))
2ef4b674 2188 SvUTF8_on(sv);
6ff81951
GS		 2189 return 0;
2190}
2191
2192int
864dbfa3 2193Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2194{
97aff369 2195 dVAR;
83f78d1a 2196 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2197 const char * const tmps = SvPV_const(sv, len);
dd374669 2198 SV * const lsv = LvTARG(sv);
777f7c56
EB		 2199 STRLEN lvoff = LvTARGOFF(sv);
2200 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC		 2201 const bool negoff = LvFLAGS(sv) & 1;
2202 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC		 2203
2204 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2205 PERL_UNUSED_ARG(mg);
075a4a2b 2206
a74fb2cd
FC		 2207 SvGETMAGIC(lsv);
2208 if (SvROK(lsv))
2209 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2210 "Attempt to use reference as lvalue in substr"
2211 );
fc061ed8
FC		 2212 SvPV_force_nomg(lsv,lsv_len);
2213 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC		 2214 if (!translate_substr_offsets(
2215 lsv_len,
2216 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2217 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2218 ))
2219 Perl_croak(aTHX_ "substr outside of string");
2220 oldtarglen = lvlen;
1aa99e6b 2221 if (DO_UTF8(sv)) {
73a087f0 2222 sv_utf8_upgrade_nomg(lsv);
d931b1be 2223 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2224 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2225 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH		 2226 SvUTF8_on(lsv);
2227 }
0d336106 2228 else if (SvUTF8(lsv)) {
5fcbf73d 2229 const char *utf8;
d931b1be 2230 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2231 newtarglen = len;
5fcbf73d 2232 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2233 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2234 Safefree(utf8);
1aa99e6b 2235 }
b76f3ce2 2236 else {
a74fb2cd 2237 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2238 newtarglen = len;
b76f3ce2 2239 }
83f78d1a
FC		 2240 if (!neglen) LvTARGLEN(sv) = newtarglen;
2241 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2242
79072805
LW		 2243 return 0;
2244}
2245
2246int
864dbfa3 2247Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2248{
97aff369 2249 dVAR;
7918f24d
NC		 2250
2251 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2252 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM		 2253#ifdef NO_TAINT_SUPPORT
2254 PERL_UNUSED_ARG(mg);
2255#endif
7918f24d 2256
27cc343c 2257 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW		 2258 return 0;
2259}
2260
2261int
864dbfa3 2262Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2263{
97aff369 2264 dVAR;
7918f24d
NC		 2265
2266 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2267 PERL_UNUSED_ARG(sv);
7918f24d 2268
b01e650a 2269 /* update taint status */
284167a5 2270 if (TAINT_get)
b01e650a
DM		 2271 mg->mg_len |= 1;
2272 else
2273 mg->mg_len &= ~1;
463ee0b2
LW		 2274 return 0;
2275}
2276
2277int
864dbfa3 2278Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2279{
35a4481c 2280 SV * const lsv = LvTARG(sv);
7918f24d
NC		 2281
2282 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2283 PERL_UNUSED_ARG(mg);
6ff81951 2284
2e9e14dd 2285 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2286
6ff81951
GS		 2287 return 0;
2288}
2289
2290int
864dbfa3 2291Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2292{
7918f24d 2293 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2294 PERL_UNUSED_ARG(mg);
79072805
LW		 2295 do_vecset(sv); /* XXX slurp this routine */
2296 return 0;
2297}
2298
13733cde
FC		 2299SV *
2300Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2301{
97aff369 2302 dVAR;
a0714e2c 2303 SV *targ = NULL;
13733cde
FC		 2304 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2305 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2306 assert(mg);
5f05dabc 2307 if (LvTARGLEN(sv)) {
68dc0745 2308 if (mg->mg_obj) {
8772537c 2309 SV * const ahv = LvTARG(sv);
85fbaab2 2310 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS		 2311 if (he)
2312 targ = HeVAL(he);
68dc0745 2313 }
bbfdc870 2314 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2315 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870
FC		 2316 if (LvSTARGOFF(sv) <= AvFILL(av))
2317 targ = AvARRAY(av)[LvSTARGOFF(sv)];
68dc0745 2318 }
46da273f 2319 if (targ && (targ != &PL_sv_undef)) {
68dc0745 2320 /* somebody else defined it for us */
2321 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2322 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745 2323 LvTARGLEN(sv) = 0;
2324 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2325 mg->mg_obj = NULL;
68dc0745 2326 mg->mg_flags &= ~MGf_REFCOUNTED;
2327 }
13733cde 2328 return targ;
5f05dabc 2329 }
71be2cbc 2330 else
13733cde
FC		 2331 return LvTARG(sv);
2332}
2333
2334int
2335Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2336{
2337 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2338
2339 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc 2340 return 0;
2341}
2342
2343int
864dbfa3 2344Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2345{
7918f24d 2346 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2347 PERL_UNUSED_ARG(mg);
71be2cbc 2348 if (LvTARGLEN(sv))
68dc0745 2349 vivify_defelem(sv);
2350 if (LvTARG(sv)) {
5f05dabc 2351 sv_setsv(LvTARG(sv), sv);
68dc0745 2352 SvSETMAGIC(LvTARG(sv));
2353 }
5f05dabc 2354 return 0;
2355}
2356
71be2cbc 2357void
864dbfa3 2358Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2359{
97aff369 2360 dVAR;
74e13ce4 2361 MAGIC *mg;
a0714e2c 2362 SV *value = NULL;
71be2cbc 2363
7918f24d
NC		 2364 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2365
14befaf4 2366 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2367 return;
68dc0745 2368 if (mg->mg_obj) {
8772537c 2369 SV * const ahv = LvTARG(sv);
85fbaab2 2370 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS		 2371 if (he)
2372 value = HeVAL(he);
3280af22 2373 if (!value || value == &PL_sv_undef)
be2597df 2374 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2375 }
bbfdc870
FC		 2376 else if (LvSTARGOFF(sv) < 0)
2377 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2378 else {
502c6561 2379 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2380 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2381 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2382 else {
bbfdc870 2383 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2384 if (!svp || !(value = *svp))
bbfdc870 2385 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2386 }
2387 }
b37c2d43 2388 SvREFCNT_inc_simple_void(value);
68dc0745 2389 SvREFCNT_dec(LvTARG(sv));
2390 LvTARG(sv) = value;
71be2cbc 2391 LvTARGLEN(sv) = 0;
68dc0745 2392 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2393 mg->mg_obj = NULL;
68dc0745 2394 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc 2395}
2396
2397int
864dbfa3 2398Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2399{
7918f24d 2400 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM		 2401 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2402 return 0;
810b8aa5
GS		 2403}
2404
2405int
864dbfa3 2406Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2407{
7918f24d 2408 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2409 PERL_UNUSED_CONTEXT;
0177730e 2410 PERL_UNUSED_ARG(sv);
565764a8 2411 mg->mg_len = -1;
93a17b20
LW		 2412 return 0;
2413}
2414
2415int
864dbfa3 2416Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2417{
35a4481c 2418 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2419
7918f24d
NC		 2420 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2421
79072805 2422 if (uf && uf->uf_set)
24f81a43 2423 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW		 2424 return 0;
2425}
2426
c277df42 2427int
faf82a0b
AE		 2428Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2429{
488344d2 2430 const char type = mg->mg_type;
7918f24d
NC		 2431
2432 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2433
488344d2
NC		 2434 if (type == PERL_MAGIC_qr) {
2435 } else if (type == PERL_MAGIC_bm) {
2436 SvTAIL_off(sv);
2437 SvVALID_off(sv);
2438 } else {
2439 assert(type == PERL_MAGIC_fm);
488344d2
NC		 2440 }
2441 return sv_unmagic(sv, type);
faf82a0b
AE		 2442}
2443
7a4c00b4 2444#ifdef USE_LOCALE_COLLATE
79072805 2445int
864dbfa3 2446Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2447{
7918f24d
NC		 2448 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2449
bbce6d69 2450 /*
838b5b74 2451 * RenE<eacute> Descartes said "I think not."
bbce6d69 2452 * and vanished with a faint plop.
2453 */
96a5add6 2454 PERL_UNUSED_CONTEXT;
8772537c 2455 PERL_UNUSED_ARG(sv);
7a4c00b4 2456 if (mg->mg_ptr) {
2457 Safefree(mg->mg_ptr);
2458 mg->mg_ptr = NULL;
565764a8 2459 mg->mg_len = -1;
7a4c00b4 2460 }
bbce6d69 2461 return 0;
2462}
7a4c00b4 2463#endif /* USE_LOCALE_COLLATE */
bbce6d69 2464
7e8c5dac
HS		 2465/* Just clear the UTF-8 cache data. */
2466int
2467Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2468{
7918f24d 2469 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2470 PERL_UNUSED_CONTEXT;
8772537c 2471 PERL_UNUSED_ARG(sv);
7e8c5dac 2472 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2473 mg->mg_ptr = NULL;
7e8c5dac
HS		 2474 mg->mg_len = -1; /* The mg_len holds the len cache. */
2475 return 0;
2476}
2477
bbce6d69 2478int
864dbfa3 2479Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2480{
97aff369 2481 dVAR;
eb578fdb
KW		 2482 const char *s;
2483 I32 paren;
2484 const REGEXP * rx;
2fdbfb4d 2485 const char * const remaining = mg->mg_ptr + 1;
79072805 2486 I32 i;
8990e307 2487 STRLEN len;
125b9982 2488 MAGIC *tmg;
2fdbfb4d 2489
7918f24d
NC		 2490 PERL_ARGS_ASSERT_MAGIC_SET;
2491
79072805 2492 switch (*mg->mg_ptr) {
2fdbfb4d
AB		 2493 case '\015': /* $^MATCH */
2494 if (strEQ(remaining, "ATCH"))
2495 goto do_match;
2496 case '`': /* ${^PREMATCH} caught below */
2497 do_prematch:
f1b875a0 2498 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB		 2499 goto setparen;
2500 case '\'': /* ${^POSTMATCH} caught below */
2501 do_postmatch:
f1b875a0 2502 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB		 2503 goto setparen;
2504 case '&':
2505 do_match:
f1b875a0 2506 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB		 2507 goto setparen;
2508 case '1': case '2': case '3': case '4':
2509 case '5': case '6': case '7': case '8': case '9':
104a8018 2510 paren = atoi(mg->mg_ptr);
2fdbfb4d 2511 setparen:
1e05feb3 2512 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
d9bad346 2513 setparen_got_rx:
2fdbfb4d 2514 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2515 } else {
2fdbfb4d
AB		 2516 /* Croak with a READONLY error when a numbered match var is
2517 * set without a previous pattern match. Unless it's C<local $1>
2518 */
d9bad346 2519 croakparen:
2fdbfb4d 2520 if (!PL_localizing) {
cb077ed2 2521 Perl_croak_no_modify();
2fdbfb4d
AB		 2522 }
2523 }
9b9e0be4 2524 break;
748a9306 2525 case '\001': /* ^A */
f2da823f
FC		 2526 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2527 else SvOK_off(PL_bodytarget);
64eff8b7
DM		 2528 FmLINES(PL_bodytarget) = 0;
2529 if (SvPOK(PL_bodytarget)) {
2530 char *s = SvPVX(PL_bodytarget);
2531 while ( ((s = strchr(s, '\n'))) ) {
2532 FmLINES(PL_bodytarget)++;
2533 s++;
2534 }
2535 }
125b9982 2536 /* mg_set() has temporarily made sv non-magical */
284167a5 2537 if (TAINTING_get) {
125b9982
NT		 2538 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2539 SvTAINTED_on(PL_bodytarget);
2540 else
2541 SvTAINTED_off(PL_bodytarget);
2542 }
748a9306 2543 break;
49460fe6 2544 case '\003': /* ^C */
f2338a2e 2545 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS		 2546 break;
2547
79072805 2548 case '\004': /* ^D */
b4ab917c 2549#ifdef DEBUGGING
b83604b4 2550 s = SvPV_nolen_const(sv);
ddcf8bc1 2551 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS		 2552 if (DEBUG_x_TEST || DEBUG_B_TEST)
2553 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2554#else
38ab35f8 2555 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2556#endif
79072805 2557 break;
28f23441 2558 case '\005': /* ^E */
d0063567 2559 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2560#ifdef VMS
38ab35f8 2561 set_vaxc_errno(SvIV(sv));
e37778c2
NC		 2562#else
2563# ifdef WIN32
d0063567 2564 SetLastError( SvIV(sv) );
e37778c2
NC		 2565# else
2566# ifdef OS2
38ab35f8 2567 os2_setsyserrno(SvIV(sv));
e37778c2 2568# else
d0063567 2569 /* will anyone ever use this? */
38ab35f8 2570 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ		 2571# endif
2572# endif
22fae026 2573#endif
d0063567
DK		 2574 }
2575 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2576 SvREFCNT_dec(PL_encoding);
d0063567
DK		 2577 if (SvOK(sv) || SvGMAGICAL(sv)) {
2578 PL_encoding = newSVsv(sv);
2579 }
2580 else {
a0714e2c 2581 PL_encoding = NULL;
d0063567
DK		 2582 }
2583 }
2584 break;
79072805 2585 case '\006': /* ^F */
38ab35f8 2586 PL_maxsysfd = SvIV(sv);
79072805 2587 break;
a0d0e21e 2588 case '\010': /* ^H */
38ab35f8 2589 PL_hints = SvIV(sv);
a0d0e21e 2590 break;
9d116dd7 2591 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2592 Safefree(PL_inplace);
bd61b366 2593 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2594 break;
d9bad346
FC		 2595 case '\016': /* ^N */
2596 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2597 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2598 goto croakparen;
28f23441 2599 case '\017': /* ^O */
ac27b0f5 2600 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2601 Safefree(PL_osname);
bd61b366 2602 PL_osname = NULL;
3511154c
DM		 2603 if (SvOK(sv)) {
2604 TAINT_PROPER("assigning to $^O");
2e0de35c 2605 PL_osname = savesvpv(sv);
3511154c 2606 }
ac27b0f5
NIS		 2607 }
2608 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC		 2609 STRLEN len;
2610 const char *const start = SvPV(sv, len);
b54fc2b6 2611 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2612 SV *tmp;
8b850bd5
NC		 2613
2614
2615 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2616 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC		 2617
2618 /* Opening for input is more common than opening for output, so
2619 ensure that hints for input are sooner on linked list. */
59cd0e26 2620 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z		 2621 SvUTF8(sv))
2622 : newSVpvs_flags("", SvUTF8(sv));
2623 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2624 mg_set(tmp);
8b850bd5 2625
f747ebd6
Z		 2626 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2627 SvUTF8(sv));
2628 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2629 mg_set(tmp);
ac27b0f5 2630 }
28f23441 2631 break;
79072805 2632 case '\020': /* ^P */
2fdbfb4d
AB		 2633 if (*remaining == '\0') { /* ^P */
2634 PL_perldb = SvIV(sv);
2635 if (PL_perldb && !PL_DBsingle)
2636 init_debugger();
2637 break;
2638 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2639 goto do_prematch;
2640 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2641 goto do_postmatch;
2642 }
9b9e0be4 2643 break;
79072805 2644 case '\024': /* ^T */
88e89b8a 2645#ifdef BIG_TIME
6b88bc9c 2646 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2647#else
38ab35f8 2648 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2649#endif
79072805 2650 break;
e07ea26a
NC		 2651 case '\025': /* ^UTF8CACHE */
2652 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2653 PL_utf8cache = (signed char) sv_2iv(sv);
2654 }
2655 break;
fde18df1 2656 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH		 2657 if (*(mg->mg_ptr+1) == '\0') {
2658 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2659 i = SvIV(sv);
ac27b0f5 2660 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2661 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2662 }
599cee73 2663 }
0a378802 2664 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2665 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC		 2666 if (!SvPOK(sv)) {
2667 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS		 2668 break;
2669 }
f4fc7782 2670 {
b5477537 2671 STRLEN len, i;
d3a7d8c7 2672 int accumulate = 0 ;
f4fc7782 2673 int any_fatals = 0 ;
b83604b4 2674 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH		 2675 for (i = 0 ; i < len ; ++i) {
2676 accumulate |= ptr[i] ;
2677 any_fatals |= (ptr[i] & 0xAA) ;
2678 }
4243c432
NC		 2679 if (!accumulate) {
2680 if (!specialWARN(PL_compiling.cop_warnings))
2681 PerlMemShared_free(PL_compiling.cop_warnings);
2682 PL_compiling.cop_warnings = pWARN_NONE;
2683 }
72dc9ed5 2684 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW		 2685 else if (isWARN_on(
2686 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2687 WARN_ALL)
2688 && !any_fatals)
2689 {
4243c432
NC		 2690 if (!specialWARN(PL_compiling.cop_warnings))
2691 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH		 2692 PL_compiling.cop_warnings = pWARN_ALL;
2693 PL_dowarn |= G_WARN_ONCE ;
727405f8 2694 }
d3a7d8c7 2695 else {
72dc9ed5
NC		 2696 STRLEN len;
2697 const char *const p = SvPV_const(sv, len);
2698
2699 PL_compiling.cop_warnings
8ee4cf24 2700 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC		 2701 p, len);
2702
d3a7d8c7
GS		 2703 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2704 PL_dowarn |= G_WARN_ONCE ;
2705 }
f4fc7782 2706
d3a7d8c7 2707 }
4438c4b7 2708 }
971a9dd3 2709 }
79072805
LW		 2710 break;
2711 case '.':
3280af22
NIS		 2712 if (PL_localizing) {
2713 if (PL_localizing == 1)
7766f137 2714 SAVESPTR(PL_last_in_gv);
748a9306 2715 }
3280af22 2716 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2717 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW		 2718 break;
2719 case '^':
acbe1b9d
FC		 2720 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2721 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2722 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2723 break;
2724 case '~':
acbe1b9d
FC		 2725 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2726 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2727 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2728 break;
2729 case '=':
acbe1b9d 2730 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2731 break;
2732 case '-':
acbe1b9d
FC		 2733 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2734 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2735 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW		 2736 break;
2737 case '%':
acbe1b9d 2738 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2739 break;
2740 case '|':
4b65379b 2741 {
099be4f1 2742 IO * const io = GvIO(PL_defoutgv);
720f287d
AB		 2743 if(!io)
2744 break;
38ab35f8 2745 if ((SvIV(sv)) == 0)
4b65379b
CS		 2746 IoFLAGS(io) &= ~IOf_FLUSH;
2747 else {
2748 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2749 PerlIO *ofp = IoOFP(io);
2750 if (ofp)
2751 (void)PerlIO_flush(ofp);
2752 IoFLAGS(io) |= IOf_FLUSH;
2753 }
2754 }
79072805
LW		 2755 }
2756 break;
79072805 2757 case '/':
3280af22 2758 SvREFCNT_dec(PL_rs);
8bfdd7d9 2759 PL_rs = newSVsv(sv);
79072805
LW		 2760 break;
2761 case '\\':
ef8d46e8 2762 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2763 if (SvOK(sv)) {
7889fe52 2764 PL_ors_sv = newSVsv(sv);
009c130f 2765 }
e3c19b7b 2766 else {
a0714e2c 2767 PL_ors_sv = NULL;
e3c19b7b 2768 }
79072805 2769 break;
7d69d4a6
FC		 2770 case '[':
2771 if (SvIV(sv) != 0)
2772 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2773 break;
79072805 2774 case '?':
ff0cee69 2775#ifdef COMPLEX_STATUS
6b88bc9c 2776 if (PL_localizing == 2) {
41cb7b2b 2777 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 2778 PL_statusvalue = LvTARGOFF(sv);
2779 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69 2780 }
2781 else
2782#endif
2783#ifdef VMSISH_STATUS
2784 if (VMSISH_STATUS)
fb38d079 2785 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69 2786 else
2787#endif
38ab35f8 2788 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW		 2789 break;
2790 case '!':
93189314
JH		 2791 {
2792#ifdef VMS
2793# define PERL_VMS_BANG vaxc$errno
2794#else
2795# define PERL_VMS_BANG 0
2796#endif
91487cfc 2797 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH		 2798 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2799 }
79072805
LW		 2800 break;
2801 case '<':
985213f2 2802 {
dfff4baf 2803 const Uid_t new_uid = SvUID(sv);
985213f2 2804 PL_delaymagic_uid = new_uid;
3280af22
NIS		 2805 if (PL_delaymagic) {
2806 PL_delaymagic |= DM_RUID;
79072805
LW		 2807 break; /* don't do magic till later */
2808 }
2809#ifdef HAS_SETRUID
dfff4baf 2810 (void)setruid(new_uid);
79072805
LW		 2811#else
2812#ifdef HAS_SETREUID
dfff4baf 2813 (void)setreuid(new_uid, (Uid_t)-1);
748a9306 2814#else
85e6fe83 2815#ifdef HAS_SETRESUID
dfff4baf 2816 (void)setresuid(new_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2817#else
985213f2 2818 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2819#ifdef PERL_DARWIN
2820 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2821 if (new_uid != 0 && PerlProc_getuid() == 0)
75870ed3 2822 (void)PerlProc_setuid(0);
2823#endif
985213f2 2824 (void)PerlProc_setuid(new_uid);
75870ed3 2825 } else {
cea2e8a9 2826 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2827 }
79072805
LW		 2828#endif
2829#endif
85e6fe83 2830#endif
79072805 2831 break;
985213f2 2832 }
79072805 2833 case '>':
985213f2 2834 {
dfff4baf 2835 const Uid_t new_euid = SvUID(sv);
985213f2 2836 PL_delaymagic_euid = new_euid;
3280af22
NIS		 2837 if (PL_delaymagic) {
2838 PL_delaymagic |= DM_EUID;
79072805
LW		 2839 break; /* don't do magic till later */
2840 }
2841#ifdef HAS_SETEUID
dfff4baf 2842 (void)seteuid(new_euid);
79072805
LW		 2843#else
2844#ifdef HAS_SETREUID
dfff4baf 2845 (void)setreuid((Uid_t)-1, new_euid);
85e6fe83
LW		 2846#else
2847#ifdef HAS_SETRESUID
dfff4baf 2848 (void)setresuid((Uid_t)-1, new_euid, (Uid_t)-1);
79072805 2849#else
985213f2 2850 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
382669a9 2851 PerlProc_setuid(new_euid);
a0d0e21e 2852 else {
cea2e8a9 2853 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2854 }
79072805
LW		 2855#endif
2856#endif
85e6fe83 2857#endif
79072805 2858 break;
985213f2 2859 }
79072805 2860 case '(':
985213f2 2861 {
dfff4baf 2862 const Gid_t new_gid = SvGID(sv);
985213f2 2863 PL_delaymagic_gid = new_gid;
3280af22
NIS		 2864 if (PL_delaymagic) {
2865 PL_delaymagic |= DM_RGID;
79072805
LW		 2866 break; /* don't do magic till later */
2867 }
2868#ifdef HAS_SETRGID
dfff4baf 2869 (void)setrgid(new_gid);
79072805
LW		 2870#else
2871#ifdef HAS_SETREGID
dfff4baf 2872 (void)setregid(new_gid, (Gid_t)-1);
85e6fe83
LW		 2873#else
2874#ifdef HAS_SETRESGID
dfff4baf 2875 (void)setresgid(new_gid, (Gid_t)-1, (Gid_t) -1);
79072805 2876#else
985213f2
AB		 2877 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
2878 (void)PerlProc_setgid(new_gid);
748a9306 2879 else {
cea2e8a9 2880 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2881 }
79072805
LW		 2882#endif
2883#endif
85e6fe83 2884#endif
79072805 2885 break;
985213f2 2886 }
79072805 2887 case ')':
985213f2 2888 {
dfff4baf 2889 Gid_t new_egid;
5cd24f17 2890#ifdef HAS_SETGROUPS
2891 {
b83604b4 2892 const char *p = SvPV_const(sv, len);
757f63d8 2893 Groups_t *gary = NULL;
fb4089e0 2894#ifdef _SC_NGROUPS_MAX
2895 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2896
2897 if (maxgrp < 0)
2898 maxgrp = NGROUPS;
2899#else
2900 int maxgrp = NGROUPS;
2901#endif
757f63d8
SP		 2902
2903 while (isSPACE(*p))
2904 ++p;
dfff4baf 2905 new_egid = (Gid_t)Atol(p);
fb4089e0 2906 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP		 2907 while (*p && !isSPACE(*p))
2908 ++p;
2909 while (isSPACE(*p))
2910 ++p;
2911 if (!*p)
2912 break;
2913 if(!gary)
2914 Newx(gary, i + 1, Groups_t);
2915 else
2916 Renew(gary, i + 1, Groups_t);
dfff4baf 2917 gary[i] = (Groups_t)Atol(p);
757f63d8
SP		 2918 }
2919 if (i)
2920 (void)setgroups(i, gary);
f5a63d97 2921 Safefree(gary);
5cd24f17 2922 }
2923#else /* HAS_SETGROUPS */
dfff4baf 2924 new_egid = SvGID(sv);
5cd24f17 2925#endif /* HAS_SETGROUPS */
985213f2 2926 PL_delaymagic_egid = new_egid;
3280af22
NIS		 2927 if (PL_delaymagic) {
2928 PL_delaymagic |= DM_EGID;
79072805
LW		 2929 break; /* don't do magic till later */
2930 }
2931#ifdef HAS_SETEGID
dfff4baf 2932 (void)setegid(new_egid);
79072805
LW		 2933#else
2934#ifdef HAS_SETREGID
dfff4baf 2935 (void)setregid((Gid_t)-1, new_egid);
85e6fe83
LW		 2936#else
2937#ifdef HAS_SETRESGID
dfff4baf 2938 (void)setresgid((Gid_t)-1, new_egid, (Gid_t)-1);
79072805 2939#else
985213f2
AB		 2940 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
2941 (void)PerlProc_setgid(new_egid);
748a9306 2942 else {
cea2e8a9 2943 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2944 }
79072805
LW		 2945#endif
2946#endif
85e6fe83 2947#endif
79072805 2948 break;
985213f2 2949 }
79072805 2950 case ':':
2d8e6c8d 2951 PL_chopset = SvPV_force(sv,len);
79072805 2952 break;
9cdac2a2
FC		 2953 case '$': /* $$ */
2954 /* Store the pid in mg->mg_obj so we can tell when a fork has
2955 occurred. mg->mg_obj points to *$ by default, so clear it. */
2956 if (isGV(mg->mg_obj)) {
2957 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2958 SvREFCNT_dec(mg->mg_obj);
2959 mg->mg_flags |= MGf_REFCOUNTED;
2960 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2961 }
2962 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2963 break;
79072805 2964 case '0':
e2975953 2965 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS		 2966#ifdef HAS_SETPROCTITLE
2967 /* The BSDs don't show the argv[] in ps(1) output, they
2968 * show a string from the process struct and provide
2969 * the setproctitle() routine to manipulate that. */
a2722ac9 2970 if (PL_origalen != 1) {
b83604b4 2971 s = SvPV_const(sv, len);
98b76f99 2972# if __FreeBSD_version > 410001
9aad2c0e 2973 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS		 2974 * but not the "(perl) suffix from the ps(1)
2975 * output, because that's what ps(1) shows if the
2976 * argv[] is modified. */
6f2ad931 2977 setproctitle("-%s", s);
9aad2c0e 2978# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS		 2979 /* This doesn't really work if you assume that
2980 * $0 = 'foobar'; will wipe out 'perl' from the $0
2981 * because in ps(1) output the result will be like
2982 * sprintf("perl: %s (perl)", s)
2983 * I guess this is a security feature:
2984 * one (a user process) cannot get rid of the original name.
2985 * --jhi */
2986 setproctitle("%s", s);
2987# endif
2988 }
9d3968b2 2989#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2990 if (PL_origalen != 1) {
17aa7f3d 2991 union pstun un;
b83604b4 2992 s = SvPV_const(sv, len);
6867be6d 2993 un.pst_command = (char *)s;
17aa7f3d
JH		 2994 pstat(PSTAT_SETCMD, un, len, 0, 0);
2995 }
9d3968b2 2996#else
2d2af554
GA		 2997 if (PL_origalen > 1) {
2998 /* PL_origalen is set in perl_parse(). */
2999 s = SvPV_force(sv,len);
3000 if (len >= (STRLEN)PL_origalen-1) {
3001 /* Longer than original, will be truncated. We assume that
3002 * PL_origalen bytes are available. */
3003 Copy(s, PL_origargv[0], PL_origalen-1, char);
3004 }
3005 else {
3006 /* Shorter than original, will be padded. */
235ac35d 3007#ifdef PERL_DARWIN
60777a0d
JH		 3008 /* Special case for Mac OS X: see [perl #38868] */
3009 const int pad = 0;
235ac35d 3010#else
8a89a4f1
MB		 3011 /* Is the space counterintuitive? Yes.
3012 * (You were expecting \0?)
3013 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3014 * --jhi */
60777a0d 3015 const int pad = ' ';
235ac35d 3016#endif
60777a0d
JH		 3017 Copy(s, PL_origargv[0], len, char);
3018 PL_origargv[0][len] = 0;
3019 memset(PL_origargv[0] + len + 1,
3020 pad, PL_origalen - len - 1);
2d2af554
GA		 3021 }
3022 PL_origargv[0][PL_origalen-1] = 0;
3023 for (i = 1; i < PL_origargc; i++)
3024 PL_origargv[i] = 0;
7636ea95
AB		 3025#ifdef HAS_PRCTL_SET_NAME
3026 /* Set the legacy process name in addition to the POSIX name on Linux */
3027 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3028 /* diag_listed_as: SKIPME */
3029 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3030 }
3031#endif
79072805 3032 }
9d3968b2 3033#endif
e2975953 3034 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW		 3035 break;
3036 }
3037 return 0;
3038}
3039
3040I32
84c7b88c
BF		 3041Perl_whichsig_sv(pTHX_ SV *sigsv)
3042{
3043 const char *sigpv;
3044 STRLEN siglen;
3045 PERL_ARGS_ASSERT_WHICHSIG_SV;
3046 PERL_UNUSED_CONTEXT;
3047 sigpv = SvPV_const(sigsv, siglen);
3048 return whichsig_pvn(sigpv, siglen);
3049}
3050
3051I32
3052Perl_whichsig_pv(pTHX_ const char *sig)
3053{
3054 PERL_ARGS_ASSERT_WHICHSIG_PV;
3055 PERL_UNUSED_CONTEXT;
3056 return whichsig_pvn(sig, strlen(sig));
3057}
3058
3059I32
3060Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3061{
eb578fdb 3062 char* const* sigv;
7918f24d 3063
84c7b88c 3064 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3065 PERL_UNUSED_CONTEXT;
79072805 3066
aadb217d 3067 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3068 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3069 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3070#ifdef SIGCLD
84c7b88c 3071 if (memEQs(sig, len, "CHLD"))
79072805
LW		 3072 return SIGCLD;
3073#endif
3074#ifdef SIGCHLD
84c7b88c 3075 if (memEQs(sig, len, "CLD"))
79072805
LW		 3076 return SIGCHLD;
3077#endif
7f1236c0 3078 return -1;
79072805
LW		 3079}
3080
ecfc5424 3081Signal_t
1e82f5a6 3082#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3083Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH		 3084#else
3085Perl_sighandler(int sig)
3086#endif
79072805 3087{
1018e26f
NIS		 3088#ifdef PERL_GET_SIG_CONTEXT
3089 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3090#else
cea2e8a9 3091 dTHX;
71d280e3 3092#endif
79072805 3093 dSP;
a0714e2c
SS		 3094 GV *gv = NULL;
3095 SV *sv = NULL;
8772537c 3096 SV * const tSv = PL_Sv;
601f1833 3097 CV *cv = NULL;
533c011a 3098 OP *myop = PL_op;
84902520 3099 U32 flags = 0;
8772537c 3100 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3101 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3102 SV *errsv_save = NULL;
71d280e3 3103
84902520 3104
727405f8 3105 if (!PL_psig_ptr[sig]) {
99ef548b 3106 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS		 3107 PL_sig_name[sig]);
3108 exit(sig);
3109 }
ff0cee69 3110
a0d63a7b
DM		 3111 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3112 /* Max number of items pushed there is 3*n or 4. We cannot fix
3113 infinity, so we fix 4 (in fact 5): */
3114 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3115 flags |= 1;
3116 PL_savestack_ix += 5; /* Protect save in progress. */
3117 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3118 }
84902520 3119 }
84902520 3120 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3121 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL		 3122 || SvTYPE(cv) != SVt_PVCV) {
3123 HV *st;
f2c0649b 3124 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3125 }
84902520 3126
a0d0e21e 3127 if (!cv || !CvROOT(cv)) {
a2a5de95
NC		 3128 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3129 PL_sig_name[sig], (gv ? GvENAME(gv)
3130 : ((cv && CvGV(cv))
3131 ? GvENAME(CvGV(cv))
3132 : "__ANON__")));
00d579c5 3133 goto cleanup;
79072805
LW		 3134 }
3135
0c4d3b5e
DM		 3136 sv = PL_psig_name[sig]
3137 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3138 : newSVpv(PL_sig_name[sig],0);
72048cfe 3139 flags |= 8;
0c4d3b5e
DM		 3140 SAVEFREESV(sv);
3141
a0d63a7b
DM		 3142 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3143 /* make sure our assumption about the size of the SAVEs are correct:
3144 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3145 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3146 }
e336de0d 3147
e788e7d3 3148 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3149 PUSHMARK(SP);
79072805 3150 PUSHs(sv);
8aad04aa
JH		 3151#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3152 {
3153 struct sigaction oact;
3154
3155 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH		 3156 if (sip) {
3157 HV *sih = newHV();
ad64d0ec 3158 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH		 3159 /* The siginfo fields signo, code, errno, pid, uid,
3160 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC		 3161 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3162 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3163#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		 3164 hv_stores(sih, "errno", newSViv(sip->si_errno));
3165 hv_stores(sih, "status", newSViv(sip->si_status));
3166 hv_stores(sih, "uid", newSViv(sip->si_uid));
3167 hv_stores(sih, "pid", newSViv(sip->si_pid));
3168 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3169 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3170#endif
8aad04aa 3171 EXTEND(SP, 2);
ad64d0ec 3172 PUSHs(rv);
22f1178f 3173 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3174 }
b4552a27 3175
8aad04aa
JH		 3176 }
3177 }
3178#endif
79072805 3179 PUTBACK;
a0d0e21e 3180
100c03aa
JL		 3181 errsv_save = newSVsv(ERRSV);
3182
ad64d0ec 3183 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3184
d3acc0f7 3185 POPSTACK;
eed484f9
DD		 3186 {
3187 SV * const errsv = ERRSV;
3188 if (SvTRUE_NN(errsv)) {
3189 SvREFCNT_dec(errsv_save);
c22d665b 3190#ifndef PERL_MICRO
1b266415
NIS		 3191 /* Handler "died", for example to get out of a restart-able read().
3192 * Before we re-do that on its behalf re-enable the signal which was
3193 * blocked by the system when we entered.
3194 */
c22d665b 3195#ifdef HAS_SIGPROCMASK
d488af49 3196#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3197 if (sip || uap)
c22d665b 3198#endif
eed484f9
DD		 3199 {
3200 sigset_t set;
3201 sigemptyset(&set);
3202 sigaddset(&set,sig);
3203 sigprocmask(SIG_UNBLOCK, &set, NULL);
3204 }
c22d665b 3205#else
eed484f9
DD		 3206 /* Not clear if this will work */
3207 (void)rsignal(sig, SIG_IGN);
3208 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT		 3209#endif
3210#endif /* !PERL_MICRO */
eed484f9
DD		 3211 die_sv(errsv);
3212 }
3213 else {
3214 sv_setsv(errsv, errsv_save);
3215 SvREFCNT_dec(errsv_save);
3216 }
100c03aa
JL		 3217 }
3218
00d579c5 3219cleanup:
0c4d3b5e
DM		 3220 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3221 PL_savestack_ix = old_ss_ix;
72048cfe 3222 if (flags & 8)
2357bae7 3223 SvREFCNT_dec_NN(sv);
533c011a 3224 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3225
3280af22
NIS		 3226 PL_Sv = tSv; /* Restore global temporaries. */
3227 PL_Xpv = tXpv;
53bb94e2 3228 return;
79072805 3229}
4e35701f
NIS		 3230
3231
51371543 3232static void
8772537c 3233S_restore_magic(pTHX_ const void *p)
51371543 3234{
97aff369 3235 dVAR;
8772537c
AL		 3236 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3237 SV* const sv = mgs->mgs_sv;
150b625d 3238 bool bumped;
51371543
GS		 3239
3240 if (!sv)
3241 return;
3242
4bac9ae4
CS		 3243 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3244 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3245#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC		 3246 /* While magic was saved (and off) sv_setsv may well have seen
3247 this SV as a prime candidate for COW. */
3248 if (SvIsCOW(sv))
e424a81e 3249 sv_force_normal_flags(sv, 0);
f9701176 3250#endif
f9c6fee5
CS		 3251 if (mgs->mgs_readonly)
3252 SvREADONLY_on(sv);
3253 if (mgs->mgs_magical)
3254 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS		 3255 else
3256 mg_magical(sv);
51371543
GS		 3257 }
3258
150b625d 3259 bumped = mgs->mgs_bumped;
51371543
GS		 3260 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3261
3262 /* If we're still on top of the stack, pop us off. (That condition
3263 * will be satisfied if restore_magic was called explicitly, but *not*
3264 * if it's being called via leave_scope.)
3265 * The reason for doing this is that otherwise, things like sv_2cv()
3266 * may leave alloc gunk on the savestack, and some code
3267 * (e.g. sighandler) doesn't expect that...
3268 */
3269 if (PL_savestack_ix == mgs->mgs_ss_ix)
3270 {
1be36ce0
NC		 3271 UV popval = SSPOPUV;
3272 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3273 PL_savestack_ix -= 2;
1be36ce0
NC		 3274 popval = SSPOPUV;
3275 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3276 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3277 }
150b625d
DM		 3278 if (bumped) {
3279 if (SvREFCNT(sv) == 1) {
3280 /* We hold the last reference to this SV, which implies that the
3281 SV was deleted as a side effect of the routines we called.
3282 So artificially keep it alive a bit longer.
3283 We avoid turning on the TEMP flag, which can cause the SV's
3284 buffer to get stolen (and maybe other stuff). */
150b625d 3285 sv_2mortal(sv);
4bac9ae4 3286 SvTEMP_off(sv);
8985fe98 3287 }
150b625d 3288 else
2357bae7 3289 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3290 }
51371543
GS		 3291}
3292
0c4d3b5e
DM		 3293/* clean up the mess created by Perl_sighandler().
3294 * Note that this is only called during an exit in a signal handler;
3295 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3296 * skipped over. */
0c4d3b5e 3297
51371543 3298static void
8772537c 3299S_unwind_handler_stack(pTHX_ const void *p)
51371543 3300{
27da23d5 3301 dVAR;
0c4d3b5e 3302 PERL_UNUSED_ARG(p);
7918f24d 3303
0c4d3b5e 3304 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3305}
1018e26f 3306
66610fdd 3307/*
b3ca2e83
NC		 3308=for apidoc magic_sethint
3309
3310Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC		 3311C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3312anything that would need a deep copy. Maybe we should warn if we find a
3313reference.
b3ca2e83
NC		 3314
3315=cut
3316*/
3317int
3318Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3319{
3320 dVAR;
ad64d0ec 3321 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3322 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3323
7918f24d
NC		 3324 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3325
e6e3e454
NC		 3326 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3327 an alternative leaf in there, with PL_compiling.cop_hints being used if
3328 it's NULL. If needed for threads, the alternative could lock a mutex,
3329 or take other more complex action. */
3330
5b9c0671
NC		 3331 /* Something changed in %^H, so it will need to be restored on scope exit.
3332 Doing this here saves a lot of doing it manually in perl code (and
3333 forgetting to do it, and consequent subtle errors. */
3334 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z		 3335 CopHINTHASH_set(&PL_compiling,
3336 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC		 3337 return 0;
3338}
3339
3340/*
f175cff5 3341=for apidoc magic_clearhint
b3ca2e83 3342
c28fe1ec
NC		 3343Triggered by a delete from %^H, records the key to
3344C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC		 3345
3346=cut
3347*/
3348int
3349Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3350{
3351 dVAR;
7918f24d
NC		 3352
3353 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL		 3354 PERL_UNUSED_ARG(sv);
3355
5b9c0671 3356 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3357 CopHINTHASH_set(&PL_compiling,
e3352591
FC		 3358 mg->mg_len == HEf_SVKEY
3359 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3360 MUTABLE_SV(mg->mg_ptr), 0, 0)
3361 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3362 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC		 3363 return 0;
3364}
3365
3366/*
f747ebd6
Z		 3367=for apidoc magic_clearhints
3368
3369Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3370
3371=cut
3372*/
3373int
3374Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3375{
3376 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3377 PERL_UNUSED_ARG(sv);
3378 PERL_UNUSED_ARG(mg);
20439bc7
Z		 3379 cophh_free(CopHINTHASH_get(&PL_compiling));
3380 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z		 3381 return 0;
3382}
3383
09fb282d
FC		 3384int
3385Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3386 const char *name, I32 namlen)
3387{
3388 MAGIC *nmg;
3389
3390 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3391 PERL_UNUSED_ARG(sv);
09fb282d
FC		 3392 PERL_UNUSED_ARG(name);
3393 PERL_UNUSED_ARG(namlen);
3394
3395 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3396 nmg = mg_find(nsv, mg->mg_type);
3397 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3398 nmg->mg_ptr = mg->mg_ptr;
3399 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3400 nmg->mg_flags |= MGf_REFCOUNTED;
3401 return 1;
3402}
3403
f747ebd6 3404/*
66610fdd
RGS		 3405 * Local variables:
3406 * c-indentation-style: bsd
3407 * c-basic-offset: 4
14d04a33 3408 * indent-tabs-mode: nil
66610fdd
RGS		 3409 * End:
3410 *
14d04a33 3411 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3412 */
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