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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);
2fd13ecc 119 mgs->mgs_readonly = SvREADONLY(sv) && !SvIsCOW(sv);
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;
2fd13ecc
FC		 124 /* Turning READONLY off for a copy-on-write scalar (including shared
125 hash keys) is a bad idea. */
126 if (!SvIsCOW(sv)) SvREADONLY_off(sv);
c07a80fd 127}
128
ff44333e
FC		 129#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
130
954c1994
GS		 131/*
132=for apidoc mg_magical
133
134Turns on the magical status of an SV. See C<sv_magic>.
135
136=cut
137*/
138
8990e307 139void
864dbfa3 140Perl_mg_magical(pTHX_ SV *sv)
8990e307 141{
e1ec3a88 142 const MAGIC* mg;
7918f24d 143 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 144 PERL_UNUSED_CONTEXT;
f9c6fee5
CS		 145
146 SvMAGICAL_off(sv);
218787bd 147 if ((mg = SvMAGIC(sv))) {
218787bd
VP		 148 do {
149 const MGVTBL* const vtbl = mg->mg_virtual;
150 if (vtbl) {
151 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
152 SvGMAGICAL_on(sv);
153 if (vtbl->svt_set)
154 SvSMAGICAL_on(sv);
155 if (vtbl->svt_clear)
156 SvRMAGICAL_on(sv);
157 }
158 } while ((mg = mg->mg_moremagic));
159 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
160 SvRMAGICAL_on(sv);
8990e307
LW		 161 }
162}
163
954c1994
GS		 164/*
165=for apidoc mg_get
166
4b1e7f06
DD		 167Do magic before a value is retrieved from the SV. The type of SV must
168be >= SVt_PVMG. See C<sv_magic>.
954c1994
GS		 169
170=cut
171*/
172
79072805 173int
864dbfa3 174Perl_mg_get(pTHX_ SV *sv)
79072805 175{
97aff369 176 dVAR;
35a4481c 177 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 178 bool saved = FALSE;
f9c6fee5 179 bool have_new = 0;
ff76feab 180 MAGIC *newmg, *head, *cur, *mg;
6683b158 181
7918f24d
NC		 182 PERL_ARGS_ASSERT_MG_GET;
183
407287f9
FC		 184 if (PL_localizing == 1 && sv == DEFSV) return 0;
185
ff76feab
AMS		 186 /* We must call svt_get(sv, mg) for each valid entry in the linked
187 list of magic. svt_get() may delete the current entry, add new
188 magic to the head of the list, or upgrade the SV. AMS 20010810 */
189
190 newmg = cur = head = mg = SvMAGIC(sv);
191 while (mg) {
35a4481c 192 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 193 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 194
2b260de0 195 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS		 196
197 /* taint's mg get is so dumb it doesn't need flag saving */
198 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
199 save_magic(mgs_ix, sv);
200 saved = TRUE;
201 }
202
16c91539 203 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 204
58f82c5c
DM		 205 /* guard against magic having been deleted - eg FETCH calling
206 * untie */
f9c6fee5
CS		 207 if (!SvMAGIC(sv)) {
208 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
58f82c5c 209 break;
f9c6fee5 210 }
b77f7d40 211
f9c6fee5 212 /* recalculate flags if this entry was deleted. */
ff76feab 213 if (mg->mg_flags & MGf_GSKIP)
f9c6fee5 214 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
a0d0e21e 215 }
7d1328bb
FC		 216 else if (vtbl == &PL_vtbl_utf8) {
217 /* get-magic can reallocate the PV */
218 magic_setutf8(sv, mg);
219 }
ff76feab 220
f9c6fee5 221 mg = nextmg;
ff76feab 222
0723351e 223 if (have_new) {
ff76feab
AMS		 224 /* Have we finished with the new entries we saw? Start again
225 where we left off (unless there are more new entries). */
226 if (mg == head) {
0723351e 227 have_new = 0;
ff76feab
AMS		 228 mg = cur;
229 head = newmg;
230 }
231 }
232
233 /* Were any new entries added? */
0723351e
NC		 234 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
235 have_new = 1;
ff76feab
AMS		 236 cur = mg;
237 mg = newmg;
f9c6fee5 238 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
760ac839 239 }
79072805 240 }
463ee0b2 241
a9844598
CS		 242 if (saved)
243 restore_magic(INT2PTR(void *, (IV)mgs_ix));
244
79072805
LW		 245 return 0;
246}
247
954c1994
GS		 248/*
249=for apidoc mg_set
250
251Do magic after a value is assigned to the SV. See C<sv_magic>.
252
253=cut
254*/
255
79072805 256int
864dbfa3 257Perl_mg_set(pTHX_ SV *sv)
79072805 258{
97aff369 259 dVAR;
35a4481c 260 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 261 MAGIC* mg;
463ee0b2
LW		 262 MAGIC* nextmg;
263
7918f24d
NC		 264 PERL_ARGS_ASSERT_MG_SET;
265
b5ed8c44
FC		 266 if (PL_localizing == 2 && sv == DEFSV) return 0;
267
ff44333e 268 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW		 269
270 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 271 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 272 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW		 273 if (mg->mg_flags & MGf_GSKIP) {
274 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
f9c6fee5 275 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
a0d0e21e 276 }
e0a73de4 277 if (PL_localizing == 2
b5ed8c44 278 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 279 continue;
2b260de0 280 if (vtbl && vtbl->svt_set)
16c91539 281 vtbl->svt_set(aTHX_ sv, mg);
79072805 282 }
463ee0b2 283
8772537c 284 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW		 285 return 0;
286}
287
954c1994
GS		 288/*
289=for apidoc mg_length
290
d4e99c76 291Reports on the SV's length in bytes, calling length magic if available,
bd8446cf
FC		 292but does not set the UTF8 flag on the sv. It will fall back to 'get'
293magic if there is no 'length' magic, but with no indication as to
294whether it called 'get' magic. It assumes the sv is a PVMG or
295higher. Use sv_len() instead.
954c1994
GS		 296
297=cut
298*/
299
79072805 300U32
864dbfa3 301Perl_mg_length(pTHX_ SV *sv)
79072805 302{
97aff369 303 dVAR;
79072805 304 MAGIC* mg;
463ee0b2 305 STRLEN len;
463ee0b2 306
7918f24d
NC		 307 PERL_ARGS_ASSERT_MG_LENGTH;
308
79072805 309 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 310 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 311 if (vtbl && vtbl->svt_len) {
35a4481c 312 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 313 save_magic(mgs_ix, sv);
a0d0e21e 314 /* omit MGf_GSKIP -- not changed here */
16c91539 315 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 316 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW		 317 return len;
318 }
319 }
320
bd8446cf 321 (void)SvPV_const(sv, len);
463ee0b2 322 return len;
79072805
LW		 323}
324
8fb26106 325I32
864dbfa3 326Perl_mg_size(pTHX_ SV *sv)
93965878
NIS		 327{
328 MAGIC* mg;
ac27b0f5 329
7918f24d
NC		 330 PERL_ARGS_ASSERT_MG_SIZE;
331
93965878 332 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 333 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 334 if (vtbl && vtbl->svt_len) {
35a4481c
AL		 335 const I32 mgs_ix = SSNEW(sizeof(MGS));
336 I32 len;
455ece5e 337 save_magic(mgs_ix, sv);
93965878 338 /* omit MGf_GSKIP -- not changed here */
16c91539 339 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 340 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS		 341 return len;
342 }
343 }
344
345 switch(SvTYPE(sv)) {
346 case SVt_PVAV:
502c6561 347 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS		 348 case SVt_PVHV:
349 /* FIXME */
350 default:
cea2e8a9 351 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS		 352 break;
353 }
354 return 0;
355}
356
954c1994
GS		 357/*
358=for apidoc mg_clear
359
360Clear something magical that the SV represents. See C<sv_magic>.
361
362=cut
363*/
364
79072805 365int
864dbfa3 366Perl_mg_clear(pTHX_ SV *sv)
79072805 367{
35a4481c 368 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 369 MAGIC* mg;
8ac77ac9 370 MAGIC *nextmg;
463ee0b2 371
7918f24d
NC		 372 PERL_ARGS_ASSERT_MG_CLEAR;
373
455ece5e 374 save_magic(mgs_ix, sv);
463ee0b2 375
8ac77ac9 376 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 377 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 378 /* omit GSKIP -- never set here */
727405f8 379
8ac77ac9
NC		 380 nextmg = mg->mg_moremagic; /* it may delete itself */
381
2b260de0 382 if (vtbl && vtbl->svt_clear)
16c91539 383 vtbl->svt_clear(aTHX_ sv, mg);
79072805 384 }
463ee0b2 385
8772537c 386 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW		 387 return 0;
388}
389
ed624ca8 390static MAGIC*
39de7f53
FR		 391S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
392{
393 PERL_UNUSED_CONTEXT;
394
395 assert(flags <= 1);
396
397 if (sv) {
398 MAGIC *mg;
399
7db6405c
FC		 400 assert(!(SvTYPE(sv) == SVt_PVAV && AvPAD_NAMELIST(sv)));
401
39de7f53
FR		 402 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
403 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
404 return mg;
405 }
406 }
407 }
408
409 return NULL;
410}
411
954c1994
GS		 412/*
413=for apidoc mg_find
414
415Finds the magic pointer for type matching the SV. See C<sv_magic>.
416
417=cut
418*/
419
93a17b20 420MAGIC*
35a4481c 421Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 422{
39de7f53
FR		 423 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
424}
425
426/*
427=for apidoc mg_findext
428
429Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
430C<sv_magicext>.
431
432=cut
433*/
434
435MAGIC*
436Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
437{
438 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
93a17b20
LW		 439}
440
96c2a8ff
FC		 441MAGIC *
442Perl_mg_find_mglob(pTHX_ SV *sv)
443{
444 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
445 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
446 /* This sv is only a delegate. //g magic must be attached to
447 its target. */
448 vivify_defelem(sv);
449 sv = LvTARG(sv);
450 }
451 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
452 return S_mg_findext_flags(aTHX_ sv, PERL_MAGIC_regex_global, 0, 0);
453 return NULL;
454}
455
954c1994
GS		 456/*
457=for apidoc mg_copy
458
459Copies the magic from one SV to another. See C<sv_magic>.
460
461=cut
462*/
463
79072805 464int
864dbfa3 465Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 466{
463ee0b2 467 int count = 0;
79072805 468 MAGIC* mg;
7918f24d
NC		 469
470 PERL_ARGS_ASSERT_MG_COPY;
471
463ee0b2 472 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 473 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 474 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 475 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 476 }
823a54a3
AL		 477 else {
478 const char type = mg->mg_type;
1e73acc8 479 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL		 480 sv_magic(nsv,
481 (type == PERL_MAGIC_tied)
482 ? SvTIED_obj(sv, mg)
483 : (type == PERL_MAGIC_regdata && mg->mg_obj)
484 ? sv
485 : mg->mg_obj,
486 toLOWER(type), key, klen);
487 count++;
488 }
79072805 489 }
79072805 490 }
463ee0b2 491 return count;
79072805
LW		 492}
493
954c1994 494/*
0cbee0a4
DM		 495=for apidoc mg_localize
496
9711599e
CS		 497Copy some of the magic from an existing SV to new localized version of that
498SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
499taint, pos).
500
af7df257 501If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS		 502This typically means that assignment will soon follow (e.g. 'local $x = $y'),
503and that will handle the magic.
0cbee0a4
DM		 504
505=cut
506*/
507
508void
af7df257 509Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 510{
97aff369 511 dVAR;
0cbee0a4 512 MAGIC *mg;
7918f24d
NC		 513
514 PERL_ARGS_ASSERT_MG_LOCALIZE;
515
658a9f31
JD		 516 if (nsv == DEFSV)
517 return;
518
0cbee0a4 519 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 520 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 521 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 522 continue;
0cbee0a4 523
a5063e7c 524 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 525 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 526 else
0cbee0a4
DM		 527 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
528 mg->mg_ptr, mg->mg_len);
a5063e7c 529
0cbee0a4 530 /* container types should remain read-only across localization */
b2b95e4c 531 if (!SvIsCOW(sv)) SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM		 532 }
533
534 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
535 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 536 if (setmagic) {
9711599e
CS		 537 PL_localizing = 1;
538 SvSETMAGIC(nsv);
539 PL_localizing = 0;
540 }
0cbee0a4
DM		 541 }
542}
543
d9088386
Z		 544#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
545static void
546S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
547{
548 const MGVTBL* const vtbl = mg->mg_virtual;
549 if (vtbl && vtbl->svt_free)
550 vtbl->svt_free(aTHX_ sv, mg);
551 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
552 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
553 Safefree(mg->mg_ptr);
554 else if (mg->mg_len == HEf_SVKEY)
555 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
556 }
557 if (mg->mg_flags & MGf_REFCOUNTED)
558 SvREFCNT_dec(mg->mg_obj);
559 Safefree(mg);
560}
561
0cbee0a4 562/*
954c1994
GS		 563=for apidoc mg_free
564
565Free any magic storage used by the SV. See C<sv_magic>.
566
567=cut
568*/
569
79072805 570int
864dbfa3 571Perl_mg_free(pTHX_ SV *sv)
79072805
LW		 572{
573 MAGIC* mg;
574 MAGIC* moremagic;
7918f24d
NC		 575
576 PERL_ARGS_ASSERT_MG_FREE;
577
79072805 578 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 579 moremagic = mg->mg_moremagic;
d9088386 580 mg_free_struct(sv, mg);
c826f41b 581 SvMAGIC_set(sv, moremagic);
79072805 582 }
b162af07 583 SvMAGIC_set(sv, NULL);
68f8932e 584 SvMAGICAL_off(sv);
79072805
LW		 585 return 0;
586}
587
d9088386
Z		 588/*
589=for apidoc Am|void|mg_free_type|SV *sv|int how
590
591Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
592
593=cut
594*/
595
596void
597Perl_mg_free_type(pTHX_ SV *sv, int how)
598{
599 MAGIC *mg, *prevmg, *moremg;
600 PERL_ARGS_ASSERT_MG_FREE_TYPE;
601 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
602 MAGIC *newhead;
603 moremg = mg->mg_moremagic;
604 if (mg->mg_type == how) {
605 /* temporarily move to the head of the magic chain, in case
606 custom free code relies on this historical aspect of mg_free */
607 if (prevmg) {
608 prevmg->mg_moremagic = moremg;
609 mg->mg_moremagic = SvMAGIC(sv);
610 SvMAGIC_set(sv, mg);
611 }
612 newhead = mg->mg_moremagic;
613 mg_free_struct(sv, mg);
614 SvMAGIC_set(sv, newhead);
615 mg = prevmg;
616 }
617 }
618 mg_magical(sv);
619}
620
79072805 621#include <signal.h>
79072805 622
942e002e 623U32
864dbfa3 624Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 625{
97aff369 626 dVAR;
8772537c 627 PERL_UNUSED_ARG(sv);
6cef1e77 628
7918f24d
NC		 629 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
630
0bd48802 631 if (PL_curpm) {
eb578fdb 632 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 633 if (rx) {
a678b0e4
YO		 634 if (mg->mg_obj) { /* @+ */
635 /* return the number possible */
07bc277f 636 return RX_NPARENS(rx);
a678b0e4 637 } else { /* @- */
07bc277f 638 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO		 639
640 /* return the last filled */
f46c4081 641 while ( paren >= 0
07bc277f
NC		 642 && (RX_OFFS(rx)[paren].start == -1
643 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 644 paren--;
a678b0e4
YO		 645 return (U32)paren;
646 }
0bd48802 647 }
8f580fb8 648 }
ac27b0f5 649
942e002e 650 return (U32)-1;
6cef1e77
IZ		 651}
652
6502e081
DM		 653/* @-, @+ */
654
6cef1e77 655int
864dbfa3 656Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 657{
97aff369 658 dVAR;
7918f24d
NC		 659
660 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
661
0bd48802 662 if (PL_curpm) {
eb578fdb 663 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 664 if (rx) {
eb578fdb
KW		 665 const I32 paren = mg->mg_len;
666 I32 s;
667 I32 t;
0bd48802
AL		 668 if (paren < 0)
669 return 0;
07bc277f
NC		 670 if (paren <= (I32)RX_NPARENS(rx) &&
671 (s = RX_OFFS(rx)[paren].start) != -1 &&
672 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 673 {
eb578fdb 674 I32 i;
0bd48802
AL		 675 if (mg->mg_obj) /* @+ */
676 i = t;
677 else /* @- */
678 i = s;
679
680 if (i > 0 && RX_MATCH_UTF8(rx)) {
07bc277f 681 const char * const b = RX_SUBBEG(rx);
0bd48802 682 if (b)
6502e081
DM		 683 i = RX_SUBCOFFSET(rx) +
684 utf8_length((U8*)b,
685 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 686 }
727405f8 687
0bd48802 688 sv_setiv(sv, i);
1aa99e6b 689 }
0bd48802 690 }
6cef1e77
IZ		 691 }
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
NC		 2024 } else {
2025 SvOK_off(sv);
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;
7e2040f0 2103 if (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 }
0c34ef67 2108 SvOK_off(sv);
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
LW		 2153
2154 if (ulen) {
4ddea69a 2155 pos = sv_or_pv_pos_u2b(lsv, s, pos, 0);
a0ed51b3 2156 }
727405f8 2157
3881461a
AL		 2158 found->mg_len = pos;
2159 found->mg_flags &= ~MGf_MINMATCH;
a0d0e21e 2160
79072805
LW		 2161 return 0;
2162}
2163
2164int
864dbfa3 2165Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS		 2166{
2167 STRLEN len;
35a4481c 2168 SV * const lsv = LvTARG(sv);
b83604b4 2169 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB		 2170 STRLEN offs = LvTARGOFF(sv);
2171 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC		 2172 const bool negoff = LvFLAGS(sv) & 1;
2173 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC		 2174
2175 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2176 PERL_UNUSED_ARG(mg);
6ff81951 2177
83f78d1a 2178 if (!translate_substr_offsets(
4ddea69a 2179 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC		 2180 negoff ? -(IV)offs : (IV)offs, !negoff,
2181 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2182 )) {
2183 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2184 sv_setsv_nomg(sv, &PL_sv_undef);
2185 return 0;
2186 }
2187
9aa983d2 2188 if (SvUTF8(lsv))
4ddea69a 2189 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2190 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2191 if (SvUTF8(lsv))
2ef4b674 2192 SvUTF8_on(sv);
6ff81951
GS		 2193 return 0;
2194}
2195
2196int
864dbfa3 2197Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2198{
97aff369 2199 dVAR;
83f78d1a 2200 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2201 const char * const tmps = SvPV_const(sv, len);
dd374669 2202 SV * const lsv = LvTARG(sv);
777f7c56
EB		 2203 STRLEN lvoff = LvTARGOFF(sv);
2204 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC		 2205 const bool negoff = LvFLAGS(sv) & 1;
2206 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC		 2207
2208 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2209 PERL_UNUSED_ARG(mg);
075a4a2b 2210
a74fb2cd
FC		 2211 SvGETMAGIC(lsv);
2212 if (SvROK(lsv))
2213 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2214 "Attempt to use reference as lvalue in substr"
2215 );
fc061ed8
FC		 2216 SvPV_force_nomg(lsv,lsv_len);
2217 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC		 2218 if (!translate_substr_offsets(
2219 lsv_len,
2220 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2221 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2222 ))
2223 Perl_croak(aTHX_ "substr outside of string");
2224 oldtarglen = lvlen;
1aa99e6b 2225 if (DO_UTF8(sv)) {
73a087f0 2226 sv_utf8_upgrade_nomg(lsv);
d931b1be 2227 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2228 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2229 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH		 2230 SvUTF8_on(lsv);
2231 }
0d336106 2232 else if (SvUTF8(lsv)) {
5fcbf73d 2233 const char *utf8;
d931b1be 2234 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2235 newtarglen = len;
5fcbf73d 2236 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2237 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2238 Safefree(utf8);
1aa99e6b 2239 }
b76f3ce2 2240 else {
a74fb2cd 2241 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2242 newtarglen = len;
b76f3ce2 2243 }
83f78d1a
FC		 2244 if (!neglen) LvTARGLEN(sv) = newtarglen;
2245 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2246
79072805
LW		 2247 return 0;
2248}
2249
2250int
864dbfa3 2251Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2252{
97aff369 2253 dVAR;
7918f24d
NC		 2254
2255 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2256 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM		 2257#ifdef NO_TAINT_SUPPORT
2258 PERL_UNUSED_ARG(mg);
2259#endif
7918f24d 2260
27cc343c 2261 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW		 2262 return 0;
2263}
2264
2265int
864dbfa3 2266Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2267{
97aff369 2268 dVAR;
7918f24d
NC		 2269
2270 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2271 PERL_UNUSED_ARG(sv);
7918f24d 2272
b01e650a 2273 /* update taint status */
284167a5 2274 if (TAINT_get)
b01e650a
DM		 2275 mg->mg_len |= 1;
2276 else
2277 mg->mg_len &= ~1;
463ee0b2
LW		 2278 return 0;
2279}
2280
2281int
864dbfa3 2282Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2283{
35a4481c 2284 SV * const lsv = LvTARG(sv);
7918f24d
NC		 2285
2286 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2287 PERL_UNUSED_ARG(mg);
6ff81951 2288
6136c704
AL		 2289 if (lsv)
2290 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2291 else
0c34ef67 2292 SvOK_off(sv);
6ff81951 2293
6ff81951
GS		 2294 return 0;
2295}
2296
2297int
864dbfa3 2298Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2299{
7918f24d 2300 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2301 PERL_UNUSED_ARG(mg);
79072805
LW		 2302 do_vecset(sv); /* XXX slurp this routine */
2303 return 0;
2304}
2305
13733cde
FC		 2306SV *
2307Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2308{
97aff369 2309 dVAR;
a0714e2c 2310 SV *targ = NULL;
13733cde
FC		 2311 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2312 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2313 assert(mg);
5f05dabc 2314 if (LvTARGLEN(sv)) {
68dc0745 2315 if (mg->mg_obj) {
8772537c 2316 SV * const ahv = LvTARG(sv);
85fbaab2 2317 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS		 2318 if (he)
2319 targ = HeVAL(he);
68dc0745 2320 }
2321 else {
502c6561 2322 AV *const av = MUTABLE_AV(LvTARG(sv));
68dc0745 2323 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2324 targ = AvARRAY(av)[LvTARGOFF(sv)];
2325 }
46da273f 2326 if (targ && (targ != &PL_sv_undef)) {
68dc0745 2327 /* somebody else defined it for us */
2328 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2329 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745 2330 LvTARGLEN(sv) = 0;
2331 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2332 mg->mg_obj = NULL;
68dc0745 2333 mg->mg_flags &= ~MGf_REFCOUNTED;
2334 }
13733cde 2335 return targ;
5f05dabc 2336 }
71be2cbc 2337 else
13733cde
FC		 2338 return LvTARG(sv);
2339}
2340
2341int
2342Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2343{
2344 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2345
2346 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc 2347 return 0;
2348}
2349
2350int
864dbfa3 2351Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2352{
7918f24d 2353 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2354 PERL_UNUSED_ARG(mg);
71be2cbc 2355 if (LvTARGLEN(sv))
68dc0745 2356 vivify_defelem(sv);
2357 if (LvTARG(sv)) {
5f05dabc 2358 sv_setsv(LvTARG(sv), sv);
68dc0745 2359 SvSETMAGIC(LvTARG(sv));
2360 }
5f05dabc 2361 return 0;
2362}
2363
71be2cbc 2364void
864dbfa3 2365Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2366{
97aff369 2367 dVAR;
74e13ce4 2368 MAGIC *mg;
a0714e2c 2369 SV *value = NULL;
71be2cbc 2370
7918f24d
NC		 2371 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2372
14befaf4 2373 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2374 return;
68dc0745 2375 if (mg->mg_obj) {
8772537c 2376 SV * const ahv = LvTARG(sv);
85fbaab2 2377 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS		 2378 if (he)
2379 value = HeVAL(he);
3280af22 2380 if (!value || value == &PL_sv_undef)
be2597df 2381 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2382 }
68dc0745 2383 else {
502c6561 2384 AV *const av = MUTABLE_AV(LvTARG(sv));
5aabfad6 2385 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
a0714e2c 2386 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2387 else {
d4c19fe8 2388 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
3280af22 2389 if (!svp || (value = *svp) == &PL_sv_undef)
cea2e8a9 2390 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
68dc0745 2391 }
2392 }
b37c2d43 2393 SvREFCNT_inc_simple_void(value);
68dc0745 2394 SvREFCNT_dec(LvTARG(sv));
2395 LvTARG(sv) = value;
71be2cbc 2396 LvTARGLEN(sv) = 0;
68dc0745 2397 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2398 mg->mg_obj = NULL;
68dc0745 2399 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc 2400}
2401
2402int
864dbfa3 2403Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2404{
7918f24d 2405 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM		 2406 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2407 return 0;
810b8aa5
GS		 2408}
2409
2410int
864dbfa3 2411Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2412{
7918f24d 2413 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2414 PERL_UNUSED_CONTEXT;
0177730e 2415 PERL_UNUSED_ARG(sv);
565764a8 2416 mg->mg_len = -1;
93a17b20
LW		 2417 return 0;
2418}
2419
2420int
864dbfa3 2421Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2422{
35a4481c 2423 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2424
7918f24d
NC		 2425 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2426
79072805 2427 if (uf && uf->uf_set)
24f81a43 2428 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW		 2429 return 0;
2430}
2431
c277df42 2432int
faf82a0b
AE		 2433Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2434{
488344d2 2435 const char type = mg->mg_type;
7918f24d
NC		 2436
2437 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2438
488344d2
NC		 2439 if (type == PERL_MAGIC_qr) {
2440 } else if (type == PERL_MAGIC_bm) {
2441 SvTAIL_off(sv);
2442 SvVALID_off(sv);
2443 } else {
2444 assert(type == PERL_MAGIC_fm);
488344d2
NC		 2445 }
2446 return sv_unmagic(sv, type);
faf82a0b
AE		 2447}
2448
7a4c00b4 2449#ifdef USE_LOCALE_COLLATE
79072805 2450int
864dbfa3 2451Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2452{
7918f24d
NC		 2453 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2454
bbce6d69 2455 /*
838b5b74 2456 * RenE<eacute> Descartes said "I think not."
bbce6d69 2457 * and vanished with a faint plop.
2458 */
96a5add6 2459 PERL_UNUSED_CONTEXT;
8772537c 2460 PERL_UNUSED_ARG(sv);
7a4c00b4 2461 if (mg->mg_ptr) {
2462 Safefree(mg->mg_ptr);
2463 mg->mg_ptr = NULL;
565764a8 2464 mg->mg_len = -1;
7a4c00b4 2465 }
bbce6d69 2466 return 0;
2467}
7a4c00b4 2468#endif /* USE_LOCALE_COLLATE */
bbce6d69 2469
7e8c5dac
HS		 2470/* Just clear the UTF-8 cache data. */
2471int
2472Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2473{
7918f24d 2474 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2475 PERL_UNUSED_CONTEXT;
8772537c 2476 PERL_UNUSED_ARG(sv);
7e8c5dac 2477 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2478 mg->mg_ptr = NULL;
7e8c5dac
HS		 2479 mg->mg_len = -1; /* The mg_len holds the len cache. */
2480 return 0;
2481}
2482
bbce6d69 2483int
864dbfa3 2484Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2485{
97aff369 2486 dVAR;
eb578fdb
KW		 2487 const char *s;
2488 I32 paren;
2489 const REGEXP * rx;
2fdbfb4d 2490 const char * const remaining = mg->mg_ptr + 1;
79072805 2491 I32 i;
8990e307 2492 STRLEN len;
125b9982 2493 MAGIC *tmg;
2fdbfb4d 2494
7918f24d
NC		 2495 PERL_ARGS_ASSERT_MAGIC_SET;
2496
79072805 2497 switch (*mg->mg_ptr) {
2fdbfb4d
AB		 2498 case '\015': /* $^MATCH */
2499 if (strEQ(remaining, "ATCH"))
2500 goto do_match;
2501 case '`': /* ${^PREMATCH} caught below */
2502 do_prematch:
f1b875a0 2503 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB		 2504 goto setparen;
2505 case '\'': /* ${^POSTMATCH} caught below */
2506 do_postmatch:
f1b875a0 2507 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB		 2508 goto setparen;
2509 case '&':
2510 do_match:
f1b875a0 2511 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB		 2512 goto setparen;
2513 case '1': case '2': case '3': case '4':
2514 case '5': case '6': case '7': case '8': case '9':
104a8018 2515 paren = atoi(mg->mg_ptr);
2fdbfb4d 2516 setparen:
1e05feb3 2517 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
d9bad346 2518 setparen_got_rx:
2fdbfb4d 2519 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2520 } else {
2fdbfb4d
AB		 2521 /* Croak with a READONLY error when a numbered match var is
2522 * set without a previous pattern match. Unless it's C<local $1>
2523 */
d9bad346 2524 croakparen:
2fdbfb4d 2525 if (!PL_localizing) {
cb077ed2 2526 Perl_croak_no_modify();
2fdbfb4d
AB		 2527 }
2528 }
9b9e0be4 2529 break;
748a9306 2530 case '\001': /* ^A */
f2da823f
FC		 2531 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2532 else SvOK_off(PL_bodytarget);
64eff8b7
DM		 2533 FmLINES(PL_bodytarget) = 0;
2534 if (SvPOK(PL_bodytarget)) {
2535 char *s = SvPVX(PL_bodytarget);
2536 while ( ((s = strchr(s, '\n'))) ) {
2537 FmLINES(PL_bodytarget)++;
2538 s++;
2539 }
2540 }
125b9982 2541 /* mg_set() has temporarily made sv non-magical */
284167a5 2542 if (TAINTING_get) {
125b9982
NT		 2543 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2544 SvTAINTED_on(PL_bodytarget);
2545 else
2546 SvTAINTED_off(PL_bodytarget);
2547 }
748a9306 2548 break;
49460fe6 2549 case '\003': /* ^C */
f2338a2e 2550 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS		 2551 break;
2552
79072805 2553 case '\004': /* ^D */
b4ab917c 2554#ifdef DEBUGGING
b83604b4 2555 s = SvPV_nolen_const(sv);
ddcf8bc1 2556 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS		 2557 if (DEBUG_x_TEST || DEBUG_B_TEST)
2558 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2559#else
38ab35f8 2560 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2561#endif
79072805 2562 break;
28f23441 2563 case '\005': /* ^E */
d0063567 2564 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2565#ifdef VMS
38ab35f8 2566 set_vaxc_errno(SvIV(sv));
e37778c2
NC		 2567#else
2568# ifdef WIN32
d0063567 2569 SetLastError( SvIV(sv) );
e37778c2
NC		 2570# else
2571# ifdef OS2
38ab35f8 2572 os2_setsyserrno(SvIV(sv));
e37778c2 2573# else
d0063567 2574 /* will anyone ever use this? */
38ab35f8 2575 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ		 2576# endif
2577# endif
22fae026 2578#endif
d0063567
DK		 2579 }
2580 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2581 SvREFCNT_dec(PL_encoding);
d0063567
DK		 2582 if (SvOK(sv) || SvGMAGICAL(sv)) {
2583 PL_encoding = newSVsv(sv);
2584 }
2585 else {
a0714e2c 2586 PL_encoding = NULL;
d0063567
DK		 2587 }
2588 }
2589 break;
79072805 2590 case '\006': /* ^F */
38ab35f8 2591 PL_maxsysfd = SvIV(sv);
79072805 2592 break;
a0d0e21e 2593 case '\010': /* ^H */
38ab35f8 2594 PL_hints = SvIV(sv);
a0d0e21e 2595 break;
9d116dd7 2596 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2597 Safefree(PL_inplace);
bd61b366 2598 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2599 break;
d9bad346
FC		 2600 case '\016': /* ^N */
2601 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2602 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2603 goto croakparen;
28f23441 2604 case '\017': /* ^O */
ac27b0f5 2605 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2606 Safefree(PL_osname);
bd61b366 2607 PL_osname = NULL;
3511154c
DM		 2608 if (SvOK(sv)) {
2609 TAINT_PROPER("assigning to $^O");
2e0de35c 2610 PL_osname = savesvpv(sv);
3511154c 2611 }
ac27b0f5
NIS		 2612 }
2613 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC		 2614 STRLEN len;
2615 const char *const start = SvPV(sv, len);
b54fc2b6 2616 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2617 SV *tmp;
8b850bd5
NC		 2618
2619
2620 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2621 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC		 2622
2623 /* Opening for input is more common than opening for output, so
2624 ensure that hints for input are sooner on linked list. */
59cd0e26 2625 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z		 2626 SvUTF8(sv))
2627 : newSVpvs_flags("", SvUTF8(sv));
2628 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2629 mg_set(tmp);
8b850bd5 2630
f747ebd6
Z		 2631 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2632 SvUTF8(sv));
2633 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2634 mg_set(tmp);
ac27b0f5 2635 }
28f23441 2636 break;
79072805 2637 case '\020': /* ^P */
2fdbfb4d
AB		 2638 if (*remaining == '\0') { /* ^P */
2639 PL_perldb = SvIV(sv);
2640 if (PL_perldb && !PL_DBsingle)
2641 init_debugger();
2642 break;
2643 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2644 goto do_prematch;
2645 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2646 goto do_postmatch;
2647 }
9b9e0be4 2648 break;
79072805 2649 case '\024': /* ^T */
88e89b8a 2650#ifdef BIG_TIME
6b88bc9c 2651 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2652#else
38ab35f8 2653 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2654#endif
79072805 2655 break;
e07ea26a
NC		 2656 case '\025': /* ^UTF8CACHE */
2657 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2658 PL_utf8cache = (signed char) sv_2iv(sv);
2659 }
2660 break;
fde18df1 2661 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH		 2662 if (*(mg->mg_ptr+1) == '\0') {
2663 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2664 i = SvIV(sv);
ac27b0f5 2665 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2666 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2667 }
599cee73 2668 }
0a378802 2669 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2670 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC		 2671 if (!SvPOK(sv)) {
2672 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS		 2673 break;
2674 }
f4fc7782 2675 {
b5477537 2676 STRLEN len, i;
d3a7d8c7 2677 int accumulate = 0 ;
f4fc7782 2678 int any_fatals = 0 ;
b83604b4 2679 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH		 2680 for (i = 0 ; i < len ; ++i) {
2681 accumulate |= ptr[i] ;
2682 any_fatals |= (ptr[i] & 0xAA) ;
2683 }
4243c432
NC		 2684 if (!accumulate) {
2685 if (!specialWARN(PL_compiling.cop_warnings))
2686 PerlMemShared_free(PL_compiling.cop_warnings);
2687 PL_compiling.cop_warnings = pWARN_NONE;
2688 }
72dc9ed5 2689 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW		 2690 else if (isWARN_on(
2691 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2692 WARN_ALL)
2693 && !any_fatals)
2694 {
4243c432
NC		 2695 if (!specialWARN(PL_compiling.cop_warnings))
2696 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH		 2697 PL_compiling.cop_warnings = pWARN_ALL;
2698 PL_dowarn |= G_WARN_ONCE ;
727405f8 2699 }
d3a7d8c7 2700 else {
72dc9ed5
NC		 2701 STRLEN len;
2702 const char *const p = SvPV_const(sv, len);
2703
2704 PL_compiling.cop_warnings
8ee4cf24 2705 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC		 2706 p, len);
2707
d3a7d8c7
GS		 2708 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2709 PL_dowarn |= G_WARN_ONCE ;
2710 }
f4fc7782 2711
d3a7d8c7 2712 }
4438c4b7 2713 }
971a9dd3 2714 }
79072805
LW		 2715 break;
2716 case '.':
3280af22
NIS		 2717 if (PL_localizing) {
2718 if (PL_localizing == 1)
7766f137 2719 SAVESPTR(PL_last_in_gv);
748a9306 2720 }
3280af22 2721 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2722 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW		 2723 break;
2724 case '^':
acbe1b9d
FC		 2725 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2726 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2727 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2728 break;
2729 case '~':
acbe1b9d
FC		 2730 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2731 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2732 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2733 break;
2734 case '=':
acbe1b9d 2735 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2736 break;
2737 case '-':
acbe1b9d
FC		 2738 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2739 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2740 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW		 2741 break;
2742 case '%':
acbe1b9d 2743 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2744 break;
2745 case '|':
4b65379b 2746 {
099be4f1 2747 IO * const io = GvIO(PL_defoutgv);
720f287d
AB		 2748 if(!io)
2749 break;
38ab35f8 2750 if ((SvIV(sv)) == 0)
4b65379b
CS		 2751 IoFLAGS(io) &= ~IOf_FLUSH;
2752 else {
2753 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2754 PerlIO *ofp = IoOFP(io);
2755 if (ofp)
2756 (void)PerlIO_flush(ofp);
2757 IoFLAGS(io) |= IOf_FLUSH;
2758 }
2759 }
79072805
LW		 2760 }
2761 break;
79072805 2762 case '/':
3280af22 2763 SvREFCNT_dec(PL_rs);
8bfdd7d9 2764 PL_rs = newSVsv(sv);
79072805
LW		 2765 break;
2766 case '\\':
ef8d46e8 2767 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2768 if (SvOK(sv)) {
7889fe52 2769 PL_ors_sv = newSVsv(sv);
009c130f 2770 }
e3c19b7b 2771 else {
a0714e2c 2772 PL_ors_sv = NULL;
e3c19b7b 2773 }
79072805 2774 break;
7d69d4a6
FC		 2775 case '[':
2776 if (SvIV(sv) != 0)
2777 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2778 break;
79072805 2779 case '?':
ff0cee69 2780#ifdef COMPLEX_STATUS
6b88bc9c 2781 if (PL_localizing == 2) {
41cb7b2b 2782 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 2783 PL_statusvalue = LvTARGOFF(sv);
2784 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69 2785 }
2786 else
2787#endif
2788#ifdef VMSISH_STATUS
2789 if (VMSISH_STATUS)
fb38d079 2790 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69 2791 else
2792#endif
38ab35f8 2793 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW		 2794 break;
2795 case '!':
93189314
JH		 2796 {
2797#ifdef VMS
2798# define PERL_VMS_BANG vaxc$errno
2799#else
2800# define PERL_VMS_BANG 0
2801#endif
91487cfc 2802 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH		 2803 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2804 }
79072805
LW		 2805 break;
2806 case '<':
985213f2 2807 {
dfff4baf 2808 const Uid_t new_uid = SvUID(sv);
985213f2 2809 PL_delaymagic_uid = new_uid;
3280af22
NIS		 2810 if (PL_delaymagic) {
2811 PL_delaymagic |= DM_RUID;
79072805
LW		 2812 break; /* don't do magic till later */
2813 }
2814#ifdef HAS_SETRUID
dfff4baf 2815 (void)setruid(new_uid);
79072805
LW		 2816#else
2817#ifdef HAS_SETREUID
dfff4baf 2818 (void)setreuid(new_uid, (Uid_t)-1);
748a9306 2819#else
85e6fe83 2820#ifdef HAS_SETRESUID
dfff4baf 2821 (void)setresuid(new_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2822#else
985213f2 2823 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2824#ifdef PERL_DARWIN
2825 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2826 if (new_uid != 0 && PerlProc_getuid() == 0)
75870ed3 2827 (void)PerlProc_setuid(0);
2828#endif
985213f2 2829 (void)PerlProc_setuid(new_uid);
75870ed3 2830 } else {
cea2e8a9 2831 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2832 }
79072805
LW		 2833#endif
2834#endif
85e6fe83 2835#endif
79072805 2836 break;
985213f2 2837 }
79072805 2838 case '>':
985213f2 2839 {
dfff4baf 2840 const Uid_t new_euid = SvUID(sv);
985213f2 2841 PL_delaymagic_euid = new_euid;
3280af22
NIS		 2842 if (PL_delaymagic) {
2843 PL_delaymagic |= DM_EUID;
79072805
LW		 2844 break; /* don't do magic till later */
2845 }
2846#ifdef HAS_SETEUID
dfff4baf 2847 (void)seteuid(new_euid);
79072805
LW		 2848#else
2849#ifdef HAS_SETREUID
dfff4baf 2850 (void)setreuid((Uid_t)-1, new_euid);
85e6fe83
LW		 2851#else
2852#ifdef HAS_SETRESUID
dfff4baf 2853 (void)setresuid((Uid_t)-1, new_euid, (Uid_t)-1);
79072805 2854#else
985213f2 2855 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
382669a9 2856 PerlProc_setuid(new_euid);
a0d0e21e 2857 else {
cea2e8a9 2858 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2859 }
79072805
LW		 2860#endif
2861#endif
85e6fe83 2862#endif
79072805 2863 break;
985213f2 2864 }
79072805 2865 case '(':
985213f2 2866 {
dfff4baf 2867 const Gid_t new_gid = SvGID(sv);
985213f2 2868 PL_delaymagic_gid = new_gid;
3280af22
NIS		 2869 if (PL_delaymagic) {
2870 PL_delaymagic |= DM_RGID;
79072805
LW		 2871 break; /* don't do magic till later */
2872 }
2873#ifdef HAS_SETRGID
dfff4baf 2874 (void)setrgid(new_gid);
79072805
LW		 2875#else
2876#ifdef HAS_SETREGID
dfff4baf 2877 (void)setregid(new_gid, (Gid_t)-1);
85e6fe83
LW		 2878#else
2879#ifdef HAS_SETRESGID
dfff4baf 2880 (void)setresgid(new_gid, (Gid_t)-1, (Gid_t) -1);
79072805 2881#else
985213f2
AB		 2882 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
2883 (void)PerlProc_setgid(new_gid);
748a9306 2884 else {
cea2e8a9 2885 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2886 }
79072805
LW		 2887#endif
2888#endif
85e6fe83 2889#endif
79072805 2890 break;
985213f2 2891 }
79072805 2892 case ')':
985213f2 2893 {
dfff4baf 2894 Gid_t new_egid;
5cd24f17 2895#ifdef HAS_SETGROUPS
2896 {
b83604b4 2897 const char *p = SvPV_const(sv, len);
757f63d8 2898 Groups_t *gary = NULL;
fb4089e0 2899#ifdef _SC_NGROUPS_MAX
2900 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2901
2902 if (maxgrp < 0)
2903 maxgrp = NGROUPS;
2904#else
2905 int maxgrp = NGROUPS;
2906#endif
757f63d8
SP		 2907
2908 while (isSPACE(*p))
2909 ++p;
dfff4baf 2910 new_egid = (Gid_t)Atol(p);
fb4089e0 2911 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP		 2912 while (*p && !isSPACE(*p))
2913 ++p;
2914 while (isSPACE(*p))
2915 ++p;
2916 if (!*p)
2917 break;
2918 if(!gary)
2919 Newx(gary, i + 1, Groups_t);
2920 else
2921 Renew(gary, i + 1, Groups_t);
dfff4baf 2922 gary[i] = (Groups_t)Atol(p);
757f63d8
SP		 2923 }
2924 if (i)
2925 (void)setgroups(i, gary);
f5a63d97 2926 Safefree(gary);
5cd24f17 2927 }
2928#else /* HAS_SETGROUPS */
dfff4baf 2929 new_egid = SvGID(sv);
5cd24f17 2930#endif /* HAS_SETGROUPS */
985213f2 2931 PL_delaymagic_egid = new_egid;
3280af22
NIS		 2932 if (PL_delaymagic) {
2933 PL_delaymagic |= DM_EGID;
79072805
LW		 2934 break; /* don't do magic till later */
2935 }
2936#ifdef HAS_SETEGID
dfff4baf 2937 (void)setegid(new_egid);
79072805
LW		 2938#else
2939#ifdef HAS_SETREGID
dfff4baf 2940 (void)setregid((Gid_t)-1, new_egid);
85e6fe83
LW		 2941#else
2942#ifdef HAS_SETRESGID
dfff4baf 2943 (void)setresgid((Gid_t)-1, new_egid, (Gid_t)-1);
79072805 2944#else
985213f2
AB		 2945 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
2946 (void)PerlProc_setgid(new_egid);
748a9306 2947 else {
cea2e8a9 2948 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2949 }
79072805
LW		 2950#endif
2951#endif
85e6fe83 2952#endif
79072805 2953 break;
985213f2 2954 }
79072805 2955 case ':':
2d8e6c8d 2956 PL_chopset = SvPV_force(sv,len);
79072805 2957 break;
9cdac2a2
FC		 2958 case '$': /* $$ */
2959 /* Store the pid in mg->mg_obj so we can tell when a fork has
2960 occurred. mg->mg_obj points to *$ by default, so clear it. */
2961 if (isGV(mg->mg_obj)) {
2962 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2963 SvREFCNT_dec(mg->mg_obj);
2964 mg->mg_flags |= MGf_REFCOUNTED;
2965 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2966 }
2967 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2968 break;
79072805 2969 case '0':
e2975953 2970 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS		 2971#ifdef HAS_SETPROCTITLE
2972 /* The BSDs don't show the argv[] in ps(1) output, they
2973 * show a string from the process struct and provide
2974 * the setproctitle() routine to manipulate that. */
a2722ac9 2975 if (PL_origalen != 1) {
b83604b4 2976 s = SvPV_const(sv, len);
98b76f99 2977# if __FreeBSD_version > 410001
9aad2c0e 2978 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS		 2979 * but not the "(perl) suffix from the ps(1)
2980 * output, because that's what ps(1) shows if the
2981 * argv[] is modified. */
6f2ad931 2982 setproctitle("-%s", s);
9aad2c0e 2983# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS		 2984 /* This doesn't really work if you assume that
2985 * $0 = 'foobar'; will wipe out 'perl' from the $0
2986 * because in ps(1) output the result will be like
2987 * sprintf("perl: %s (perl)", s)
2988 * I guess this is a security feature:
2989 * one (a user process) cannot get rid of the original name.
2990 * --jhi */
2991 setproctitle("%s", s);
2992# endif
2993 }
9d3968b2 2994#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2995 if (PL_origalen != 1) {
17aa7f3d 2996 union pstun un;
b83604b4 2997 s = SvPV_const(sv, len);
6867be6d 2998 un.pst_command = (char *)s;
17aa7f3d
JH		 2999 pstat(PSTAT_SETCMD, un, len, 0, 0);
3000 }
9d3968b2 3001#else
2d2af554
GA		 3002 if (PL_origalen > 1) {
3003 /* PL_origalen is set in perl_parse(). */
3004 s = SvPV_force(sv,len);
3005 if (len >= (STRLEN)PL_origalen-1) {
3006 /* Longer than original, will be truncated. We assume that
3007 * PL_origalen bytes are available. */
3008 Copy(s, PL_origargv[0], PL_origalen-1, char);
3009 }
3010 else {
3011 /* Shorter than original, will be padded. */
235ac35d 3012#ifdef PERL_DARWIN
60777a0d
JH		 3013 /* Special case for Mac OS X: see [perl #38868] */
3014 const int pad = 0;
235ac35d 3015#else
8a89a4f1
MB		 3016 /* Is the space counterintuitive? Yes.
3017 * (You were expecting \0?)
3018 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3019 * --jhi */
60777a0d 3020 const int pad = ' ';
235ac35d 3021#endif
60777a0d
JH		 3022 Copy(s, PL_origargv[0], len, char);
3023 PL_origargv[0][len] = 0;
3024 memset(PL_origargv[0] + len + 1,
3025 pad, PL_origalen - len - 1);
2d2af554
GA		 3026 }
3027 PL_origargv[0][PL_origalen-1] = 0;
3028 for (i = 1; i < PL_origargc; i++)
3029 PL_origargv[i] = 0;
7636ea95
AB		 3030#ifdef HAS_PRCTL_SET_NAME
3031 /* Set the legacy process name in addition to the POSIX name on Linux */
3032 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3033 /* diag_listed_as: SKIPME */
3034 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3035 }
3036#endif
79072805 3037 }
9d3968b2 3038#endif
e2975953 3039 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW		 3040 break;
3041 }
3042 return 0;
3043}
3044
3045I32
84c7b88c
BF		 3046Perl_whichsig_sv(pTHX_ SV *sigsv)
3047{
3048 const char *sigpv;
3049 STRLEN siglen;
3050 PERL_ARGS_ASSERT_WHICHSIG_SV;
3051 PERL_UNUSED_CONTEXT;
3052 sigpv = SvPV_const(sigsv, siglen);
3053 return whichsig_pvn(sigpv, siglen);
3054}
3055
3056I32
3057Perl_whichsig_pv(pTHX_ const char *sig)
3058{
3059 PERL_ARGS_ASSERT_WHICHSIG_PV;
3060 PERL_UNUSED_CONTEXT;
3061 return whichsig_pvn(sig, strlen(sig));
3062}
3063
3064I32
3065Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3066{
eb578fdb 3067 char* const* sigv;
7918f24d 3068
84c7b88c 3069 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3070 PERL_UNUSED_CONTEXT;
79072805 3071
aadb217d 3072 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3073 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3074 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3075#ifdef SIGCLD
84c7b88c 3076 if (memEQs(sig, len, "CHLD"))
79072805
LW		 3077 return SIGCLD;
3078#endif
3079#ifdef SIGCHLD
84c7b88c 3080 if (memEQs(sig, len, "CLD"))
79072805
LW		 3081 return SIGCHLD;
3082#endif
7f1236c0 3083 return -1;
79072805
LW		 3084}
3085
ecfc5424 3086Signal_t
1e82f5a6 3087#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3088Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH		 3089#else
3090Perl_sighandler(int sig)
3091#endif
79072805 3092{
1018e26f
NIS		 3093#ifdef PERL_GET_SIG_CONTEXT
3094 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3095#else
cea2e8a9 3096 dTHX;
71d280e3 3097#endif
79072805 3098 dSP;
a0714e2c
SS		 3099 GV *gv = NULL;
3100 SV *sv = NULL;
8772537c 3101 SV * const tSv = PL_Sv;
601f1833 3102 CV *cv = NULL;
533c011a 3103 OP *myop = PL_op;
84902520 3104 U32 flags = 0;
8772537c 3105 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3106 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3107 SV *errsv_save = NULL;
71d280e3 3108
84902520 3109
727405f8 3110 if (!PL_psig_ptr[sig]) {
99ef548b 3111 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS		 3112 PL_sig_name[sig]);
3113 exit(sig);
3114 }
ff0cee69 3115
a0d63a7b
DM		 3116 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3117 /* Max number of items pushed there is 3*n or 4. We cannot fix
3118 infinity, so we fix 4 (in fact 5): */
3119 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3120 flags |= 1;
3121 PL_savestack_ix += 5; /* Protect save in progress. */
3122 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3123 }
84902520 3124 }
84902520 3125 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3126 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL		 3127 || SvTYPE(cv) != SVt_PVCV) {
3128 HV *st;
f2c0649b 3129 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3130 }
84902520 3131
a0d0e21e 3132 if (!cv || !CvROOT(cv)) {
a2a5de95
NC		 3133 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3134 PL_sig_name[sig], (gv ? GvENAME(gv)
3135 : ((cv && CvGV(cv))
3136 ? GvENAME(CvGV(cv))
3137 : "__ANON__")));
00d579c5 3138 goto cleanup;
79072805
LW		 3139 }
3140
0c4d3b5e
DM		 3141 sv = PL_psig_name[sig]
3142 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3143 : newSVpv(PL_sig_name[sig],0);
72048cfe 3144 flags |= 8;
0c4d3b5e
DM		 3145 SAVEFREESV(sv);
3146
a0d63a7b
DM		 3147 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3148 /* make sure our assumption about the size of the SAVEs are correct:
3149 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3150 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3151 }
e336de0d 3152
e788e7d3 3153 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3154 PUSHMARK(SP);
79072805 3155 PUSHs(sv);
8aad04aa
JH		 3156#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3157 {
3158 struct sigaction oact;
3159
3160 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH		 3161 if (sip) {
3162 HV *sih = newHV();
ad64d0ec 3163 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH		 3164 /* The siginfo fields signo, code, errno, pid, uid,
3165 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC		 3166 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3167 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3168#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		 3169 hv_stores(sih, "errno", newSViv(sip->si_errno));
3170 hv_stores(sih, "status", newSViv(sip->si_status));
3171 hv_stores(sih, "uid", newSViv(sip->si_uid));
3172 hv_stores(sih, "pid", newSViv(sip->si_pid));
3173 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3174 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3175#endif
8aad04aa 3176 EXTEND(SP, 2);
ad64d0ec 3177 PUSHs(rv);
22f1178f 3178 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3179 }
b4552a27 3180
8aad04aa
JH		 3181 }
3182 }
3183#endif
79072805 3184 PUTBACK;
a0d0e21e 3185
100c03aa
JL		 3186 errsv_save = newSVsv(ERRSV);
3187
ad64d0ec 3188 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3189
d3acc0f7 3190 POPSTACK;
eed484f9
DD		 3191 {
3192 SV * const errsv = ERRSV;
3193 if (SvTRUE_NN(errsv)) {
3194 SvREFCNT_dec(errsv_save);
c22d665b 3195#ifndef PERL_MICRO
1b266415
NIS		 3196 /* Handler "died", for example to get out of a restart-able read().
3197 * Before we re-do that on its behalf re-enable the signal which was
3198 * blocked by the system when we entered.
3199 */
c22d665b 3200#ifdef HAS_SIGPROCMASK
d488af49 3201#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3202 if (sip || uap)
c22d665b 3203#endif
eed484f9
DD		 3204 {
3205 sigset_t set;
3206 sigemptyset(&set);
3207 sigaddset(&set,sig);
3208 sigprocmask(SIG_UNBLOCK, &set, NULL);
3209 }
c22d665b 3210#else
eed484f9
DD		 3211 /* Not clear if this will work */
3212 (void)rsignal(sig, SIG_IGN);
3213 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT		 3214#endif
3215#endif /* !PERL_MICRO */
eed484f9
DD		 3216 die_sv(errsv);
3217 }
3218 else {
3219 sv_setsv(errsv, errsv_save);
3220 SvREFCNT_dec(errsv_save);
3221 }
100c03aa
JL		 3222 }
3223
00d579c5 3224cleanup:
0c4d3b5e
DM		 3225 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3226 PL_savestack_ix = old_ss_ix;
72048cfe 3227 if (flags & 8)
2357bae7 3228 SvREFCNT_dec_NN(sv);
533c011a 3229 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3230
3280af22
NIS		 3231 PL_Sv = tSv; /* Restore global temporaries. */
3232 PL_Xpv = tXpv;
53bb94e2 3233 return;
79072805 3234}
4e35701f
NIS		 3235
3236
51371543 3237static void
8772537c 3238S_restore_magic(pTHX_ const void *p)
51371543 3239{
97aff369 3240 dVAR;
8772537c
AL		 3241 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3242 SV* const sv = mgs->mgs_sv;
150b625d 3243 bool bumped;
51371543
GS		 3244
3245 if (!sv)
3246 return;
3247
4bac9ae4
CS		 3248 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3249 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3250#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC		 3251 /* While magic was saved (and off) sv_setsv may well have seen
3252 this SV as a prime candidate for COW. */
3253 if (SvIsCOW(sv))
e424a81e 3254 sv_force_normal_flags(sv, 0);
f9701176 3255#endif
f9c6fee5
CS		 3256 if (mgs->mgs_readonly)
3257 SvREADONLY_on(sv);
3258 if (mgs->mgs_magical)
3259 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS		 3260 else
3261 mg_magical(sv);
51371543
GS		 3262 }
3263
150b625d 3264 bumped = mgs->mgs_bumped;
51371543
GS		 3265 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3266
3267 /* If we're still on top of the stack, pop us off. (That condition
3268 * will be satisfied if restore_magic was called explicitly, but *not*
3269 * if it's being called via leave_scope.)
3270 * The reason for doing this is that otherwise, things like sv_2cv()
3271 * may leave alloc gunk on the savestack, and some code
3272 * (e.g. sighandler) doesn't expect that...
3273 */
3274 if (PL_savestack_ix == mgs->mgs_ss_ix)
3275 {
1be36ce0
NC		 3276 UV popval = SSPOPUV;
3277 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3278 PL_savestack_ix -= 2;
1be36ce0
NC		 3279 popval = SSPOPUV;
3280 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3281 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3282 }
150b625d
DM		 3283 if (bumped) {
3284 if (SvREFCNT(sv) == 1) {
3285 /* We hold the last reference to this SV, which implies that the
3286 SV was deleted as a side effect of the routines we called.
3287 So artificially keep it alive a bit longer.
3288 We avoid turning on the TEMP flag, which can cause the SV's
3289 buffer to get stolen (and maybe other stuff). */
150b625d 3290 sv_2mortal(sv);
4bac9ae4 3291 SvTEMP_off(sv);
8985fe98 3292 }
150b625d 3293 else
2357bae7 3294 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3295 }
51371543
GS		 3296}
3297
0c4d3b5e
DM		 3298/* clean up the mess created by Perl_sighandler().
3299 * Note that this is only called during an exit in a signal handler;
3300 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3301 * skipped over. */
0c4d3b5e 3302
51371543 3303static void
8772537c 3304S_unwind_handler_stack(pTHX_ const void *p)
51371543 3305{
27da23d5 3306 dVAR;
0c4d3b5e 3307 PERL_UNUSED_ARG(p);
7918f24d 3308
0c4d3b5e 3309 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3310}
1018e26f 3311
66610fdd 3312/*
b3ca2e83
NC		 3313=for apidoc magic_sethint
3314
3315Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC		 3316C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3317anything that would need a deep copy. Maybe we should warn if we find a
3318reference.
b3ca2e83
NC		 3319
3320=cut
3321*/
3322int
3323Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3324{
3325 dVAR;
ad64d0ec 3326 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3327 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3328
7918f24d
NC		 3329 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3330
e6e3e454
NC		 3331 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3332 an alternative leaf in there, with PL_compiling.cop_hints being used if
3333 it's NULL. If needed for threads, the alternative could lock a mutex,
3334 or take other more complex action. */
3335
5b9c0671
NC		 3336 /* Something changed in %^H, so it will need to be restored on scope exit.
3337 Doing this here saves a lot of doing it manually in perl code (and
3338 forgetting to do it, and consequent subtle errors. */
3339 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z		 3340 CopHINTHASH_set(&PL_compiling,
3341 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC		 3342 return 0;
3343}
3344
3345/*
f175cff5 3346=for apidoc magic_clearhint
b3ca2e83 3347
c28fe1ec
NC		 3348Triggered by a delete from %^H, records the key to
3349C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC		 3350
3351=cut
3352*/
3353int
3354Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3355{
3356 dVAR;
7918f24d
NC		 3357
3358 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL		 3359 PERL_UNUSED_ARG(sv);
3360
5b9c0671 3361 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3362 CopHINTHASH_set(&PL_compiling,
e3352591
FC		 3363 mg->mg_len == HEf_SVKEY
3364 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3365 MUTABLE_SV(mg->mg_ptr), 0, 0)
3366 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3367 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC		 3368 return 0;
3369}
3370
3371/*
f747ebd6
Z		 3372=for apidoc magic_clearhints
3373
3374Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3375
3376=cut
3377*/
3378int
3379Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3380{
3381 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3382 PERL_UNUSED_ARG(sv);
3383 PERL_UNUSED_ARG(mg);
20439bc7
Z		 3384 cophh_free(CopHINTHASH_get(&PL_compiling));
3385 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z		 3386 return 0;
3387}
3388
09fb282d
FC		 3389int
3390Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3391 const char *name, I32 namlen)
3392{
3393 MAGIC *nmg;
3394
3395 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3396 PERL_UNUSED_ARG(sv);
09fb282d
FC		 3397 PERL_UNUSED_ARG(name);
3398 PERL_UNUSED_ARG(namlen);
3399
3400 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3401 nmg = mg_find(nsv, mg->mg_type);
3402 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3403 nmg->mg_ptr = mg->mg_ptr;
3404 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3405 nmg->mg_flags |= MGf_REFCOUNTED;
3406 return 1;
3407}
3408
f747ebd6 3409/*
66610fdd
RGS		 3410 * Local variables:
3411 * c-indentation-style: bsd
3412 * c-basic-offset: 4
14d04a33 3413 * indent-tabs-mode: nil
66610fdd
RGS		 3414 * End:
3415 *
14d04a33 3416 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3417 */
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