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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"Magic" is special data attached to SV structures in order to give them
21"magical" properties. When any Perl code tries to read from, or assign to,
22an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 23with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 24give it a chance to update its internal value (get on $. writes the line
b53c43bf 25number of the last read filehandle into the SV's IV slot), while
166f8a29 26set is called after an SV has been written to, in order to allow it to make
ddfa107c 27use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
28PL_rs global variable).
29
30Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 31SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 32of functions that implement the get(), set(), length() etc functions,
154e47c8 33plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
34a MAGIC structure that contains a pointer to the object associated with the
35tie.
36
7fefc6c1
KW
37=cut
38
ccfc67b7
JH
39*/
40
79072805 41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_MG_C
79072805
LW
43#include "perl.h"
44
5cd24f17 45#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
46# ifdef I_GRP
47# include <grp.h>
48# endif
188ea221
CS
49#endif
50
757f63d8
SP
51#if defined(HAS_SETGROUPS)
52# ifndef NGROUPS
53# define NGROUPS 32
54# endif
55#endif
56
17aa7f3d
JH
57#ifdef __hpux
58# include <sys/pstat.h>
59#endif
60
7636ea95
AB
61#ifdef HAS_PRCTL_SET_NAME
62# include <sys/prctl.h>
63#endif
64
8aad04aa 65#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 66Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 67#else
e69880a5 68Signal_t Perl_csighandler(int sig);
8aad04aa 69#endif
e69880a5 70
9cffb111
OS
71#ifdef __Lynx__
72/* Missing protos on LynxOS */
73void setruid(uid_t id);
74void seteuid(uid_t id);
75void setrgid(uid_t id);
76void setegid(uid_t id);
77#endif
78
c07a80fd 79/*
4bac9ae4 80 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
82 */
83
84struct magic_state {
85 SV* mgs_sv;
455ece5e 86 I32 mgs_ss_ix;
a623f893 87 U32 mgs_flags;
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{
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d 97
ff44333e 98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 99
4bac9ae4
CS
100 assert(SvMAGICAL(sv));
101
150b625d
DM
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
110 bumped = TRUE;
111 }
8985fe98 112
8772537c 113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
114
115 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 116 mgs->mgs_sv = sv;
a623f893 117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 119 mgs->mgs_bumped = bumped;
c07a80fd 120
ff44333e 121 SvFLAGS(sv) &= ~flags;
3805b5fb 122 SvREADONLY_off(sv);
c07a80fd
PP
123}
124
ff44333e
FC
125#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
126
954c1994
GS
127/*
128=for apidoc mg_magical
129
130Turns on the magical status of an SV. See C<sv_magic>.
131
132=cut
133*/
134
8990e307 135void
ddeaf645 136Perl_mg_magical(SV *sv)
8990e307 137{
e1ec3a88 138 const MAGIC* mg;
7918f24d 139 PERL_ARGS_ASSERT_MG_MAGICAL;
f9c6fee5
CS
140
141 SvMAGICAL_off(sv);
218787bd 142 if ((mg = SvMAGIC(sv))) {
218787bd
VP
143 do {
144 const MGVTBL* const vtbl = mg->mg_virtual;
145 if (vtbl) {
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 SvGMAGICAL_on(sv);
148 if (vtbl->svt_set)
149 SvSMAGICAL_on(sv);
150 if (vtbl->svt_clear)
151 SvRMAGICAL_on(sv);
152 }
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
155 SvRMAGICAL_on(sv);
8990e307
LW
156 }
157}
158
954c1994
GS
159/*
160=for apidoc mg_get
161
4b1e7f06 162Do magic before a value is retrieved from the SV. The type of SV must
72d33970 163be >= SVt_PVMG. See C<sv_magic>.
954c1994
GS
164
165=cut
166*/
167
79072805 168int
864dbfa3 169Perl_mg_get(pTHX_ SV *sv)
79072805 170{
35a4481c 171 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 172 bool saved = FALSE;
f9c6fee5 173 bool have_new = 0;
ff76feab 174 MAGIC *newmg, *head, *cur, *mg;
6683b158 175
7918f24d
NC
176 PERL_ARGS_ASSERT_MG_GET;
177
407287f9
FC
178 if (PL_localizing == 1 && sv == DEFSV) return 0;
179
ff76feab
AMS
180 /* We must call svt_get(sv, mg) for each valid entry in the linked
181 list of magic. svt_get() may delete the current entry, add new
182 magic to the head of the list, or upgrade the SV. AMS 20010810 */
183
184 newmg = cur = head = mg = SvMAGIC(sv);
185 while (mg) {
35a4481c 186 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 187 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 188
2b260de0 189 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
190
191 /* taint's mg get is so dumb it doesn't need flag saving */
192 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
194 saved = TRUE;
195 }
196
16c91539 197 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 198
58f82c5c
DM
199 /* guard against magic having been deleted - eg FETCH calling
200 * untie */
f9c6fee5 201 if (!SvMAGIC(sv)) {
a623f893
FC
202 /* recalculate flags */
203 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 204 break;
f9c6fee5 205 }
b77f7d40 206
f9c6fee5 207 /* recalculate flags if this entry was deleted. */
ff76feab 208 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
209 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
210 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 211 }
7d1328bb
FC
212 else if (vtbl == &PL_vtbl_utf8) {
213 /* get-magic can reallocate the PV */
214 magic_setutf8(sv, mg);
215 }
ff76feab 216
f9c6fee5 217 mg = nextmg;
ff76feab 218
0723351e 219 if (have_new) {
ff76feab
AMS
220 /* Have we finished with the new entries we saw? Start again
221 where we left off (unless there are more new entries). */
222 if (mg == head) {
0723351e 223 have_new = 0;
ff76feab
AMS
224 mg = cur;
225 head = newmg;
226 }
227 }
228
229 /* Were any new entries added? */
0723351e
NC
230 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
231 have_new = 1;
ff76feab
AMS
232 cur = mg;
233 mg = newmg;
a623f893
FC
234 /* recalculate flags */
235 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 236 }
79072805 237 }
463ee0b2 238
a9844598
CS
239 if (saved)
240 restore_magic(INT2PTR(void *, (IV)mgs_ix));
241
79072805
LW
242 return 0;
243}
244
954c1994
GS
245/*
246=for apidoc mg_set
247
248Do magic after a value is assigned to the SV. See C<sv_magic>.
249
250=cut
251*/
252
79072805 253int
864dbfa3 254Perl_mg_set(pTHX_ SV *sv)
79072805 255{
35a4481c 256 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 257 MAGIC* mg;
463ee0b2
LW
258 MAGIC* nextmg;
259
7918f24d
NC
260 PERL_ARGS_ASSERT_MG_SET;
261
b5ed8c44
FC
262 if (PL_localizing == 2 && sv == DEFSV) return 0;
263
ff44333e 264 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
265
266 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 267 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 268 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
269 if (mg->mg_flags & MGf_GSKIP) {
270 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 271 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 272 }
e0a73de4 273 if (PL_localizing == 2
b5ed8c44 274 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 275 continue;
2b260de0 276 if (vtbl && vtbl->svt_set)
16c91539 277 vtbl->svt_set(aTHX_ sv, mg);
79072805 278 }
463ee0b2 279
8772537c 280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
281 return 0;
282}
283
954c1994
GS
284/*
285=for apidoc mg_length
286
d4e99c76 287Reports on the SV's length in bytes, calling length magic if available,
bd8446cf
FC
288but does not set the UTF8 flag on the sv. It will fall back to 'get'
289magic if there is no 'length' magic, but with no indication as to
290whether it called 'get' magic. It assumes the sv is a PVMG or
291higher. Use sv_len() instead.
954c1994
GS
292
293=cut
294*/
295
79072805 296U32
864dbfa3 297Perl_mg_length(pTHX_ SV *sv)
79072805
LW
298{
299 MAGIC* mg;
463ee0b2 300 STRLEN len;
463ee0b2 301
7918f24d
NC
302 PERL_ARGS_ASSERT_MG_LENGTH;
303
79072805 304 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 305 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 306 if (vtbl && vtbl->svt_len) {
35a4481c 307 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 308 save_magic(mgs_ix, sv);
a0d0e21e 309 /* omit MGf_GSKIP -- not changed here */
16c91539 310 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 311 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
312 return len;
313 }
314 }
315
bd8446cf 316 (void)SvPV_const(sv, len);
463ee0b2 317 return len;
79072805
LW
318}
319
8fb26106 320I32
864dbfa3 321Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
322{
323 MAGIC* mg;
ac27b0f5 324
7918f24d
NC
325 PERL_ARGS_ASSERT_MG_SIZE;
326
93965878 327 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 328 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 329 if (vtbl && vtbl->svt_len) {
35a4481c
AL
330 const I32 mgs_ix = SSNEW(sizeof(MGS));
331 I32 len;
455ece5e 332 save_magic(mgs_ix, sv);
93965878 333 /* omit MGf_GSKIP -- not changed here */
16c91539 334 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 335 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
336 return len;
337 }
338 }
339
340 switch(SvTYPE(sv)) {
341 case SVt_PVAV:
502c6561 342 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
343 case SVt_PVHV:
344 /* FIXME */
345 default:
cea2e8a9 346 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 347
93965878 348 }
a25b5927 349 NOT_REACHED; /* NOTREACHED */
93965878
NIS
350}
351
954c1994
GS
352/*
353=for apidoc mg_clear
354
355Clear something magical that the SV represents. See C<sv_magic>.
356
357=cut
358*/
359
79072805 360int
864dbfa3 361Perl_mg_clear(pTHX_ SV *sv)
79072805 362{
35a4481c 363 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 364 MAGIC* mg;
8ac77ac9 365 MAGIC *nextmg;
463ee0b2 366
7918f24d
NC
367 PERL_ARGS_ASSERT_MG_CLEAR;
368
455ece5e 369 save_magic(mgs_ix, sv);
463ee0b2 370
8ac77ac9 371 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 372 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 373 /* omit GSKIP -- never set here */
727405f8 374
8ac77ac9
NC
375 nextmg = mg->mg_moremagic; /* it may delete itself */
376
2b260de0 377 if (vtbl && vtbl->svt_clear)
16c91539 378 vtbl->svt_clear(aTHX_ sv, mg);
79072805 379 }
463ee0b2 380
8772537c 381 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
382 return 0;
383}
384
ed624ca8 385static MAGIC*
ddeaf645 386S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 387{
39de7f53
FR
388 assert(flags <= 1);
389
390 if (sv) {
391 MAGIC *mg;
392
393 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
394 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
395 return mg;
396 }
397 }
398 }
399
400 return NULL;
401}
402
954c1994
GS
403/*
404=for apidoc mg_find
405
406Finds the magic pointer for type matching the SV. See C<sv_magic>.
407
408=cut
409*/
410
93a17b20 411MAGIC*
ddeaf645 412Perl_mg_find(const SV *sv, int type)
93a17b20 413{
ddeaf645 414 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
415}
416
417/*
418=for apidoc mg_findext
419
420Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
421C<sv_magicext>.
422
423=cut
424*/
425
426MAGIC*
ddeaf645 427Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 428{
ddeaf645 429 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
430}
431
96c2a8ff
FC
432MAGIC *
433Perl_mg_find_mglob(pTHX_ SV *sv)
434{
435 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
436 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
437 /* This sv is only a delegate. //g magic must be attached to
438 its target. */
439 vivify_defelem(sv);
440 sv = LvTARG(sv);
441 }
442 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 443 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
444 return NULL;
445}
446
954c1994
GS
447/*
448=for apidoc mg_copy
449
450Copies the magic from one SV to another. See C<sv_magic>.
451
452=cut
453*/
454
79072805 455int
864dbfa3 456Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 457{
463ee0b2 458 int count = 0;
79072805 459 MAGIC* mg;
7918f24d
NC
460
461 PERL_ARGS_ASSERT_MG_COPY;
462
463ee0b2 463 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 464 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 465 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 466 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 467 }
823a54a3
AL
468 else {
469 const char type = mg->mg_type;
1e73acc8 470 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
471 sv_magic(nsv,
472 (type == PERL_MAGIC_tied)
473 ? SvTIED_obj(sv, mg)
474 : (type == PERL_MAGIC_regdata && mg->mg_obj)
475 ? sv
476 : mg->mg_obj,
477 toLOWER(type), key, klen);
478 count++;
479 }
79072805 480 }
79072805 481 }
463ee0b2 482 return count;
79072805
LW
483}
484
954c1994 485/*
0cbee0a4
DM
486=for apidoc mg_localize
487
9711599e 488Copy some of the magic from an existing SV to new localized version of that
154e47c8
FC
489SV. Container magic (eg %ENV, $1, tie)
490gets copied, value magic doesn't (eg
9711599e
CS
491taint, pos).
492
af7df257 493If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
494This typically means that assignment will soon follow (e.g. 'local $x = $y'),
495and that will handle the magic.
0cbee0a4
DM
496
497=cut
498*/
499
500void
af7df257 501Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
502{
503 MAGIC *mg;
7918f24d
NC
504
505 PERL_ARGS_ASSERT_MG_LOCALIZE;
506
658a9f31
JD
507 if (nsv == DEFSV)
508 return;
509
0cbee0a4 510 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 511 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 512 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 513 continue;
0cbee0a4 514
a5063e7c 515 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 516 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 517 else
0cbee0a4
DM
518 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
519 mg->mg_ptr, mg->mg_len);
a5063e7c 520
0cbee0a4 521 /* container types should remain read-only across localization */
9ff3e6d8 522 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
523 }
524
525 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
526 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 527 if (setmagic) {
9711599e
CS
528 PL_localizing = 1;
529 SvSETMAGIC(nsv);
530 PL_localizing = 0;
531 }
0cbee0a4
DM
532 }
533}
534
d9088386
Z
535#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
536static void
537S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
538{
539 const MGVTBL* const vtbl = mg->mg_virtual;
540 if (vtbl && vtbl->svt_free)
541 vtbl->svt_free(aTHX_ sv, mg);
542 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
543 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
544 Safefree(mg->mg_ptr);
545 else if (mg->mg_len == HEf_SVKEY)
546 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
547 }
548 if (mg->mg_flags & MGf_REFCOUNTED)
549 SvREFCNT_dec(mg->mg_obj);
550 Safefree(mg);
551}
552
0cbee0a4 553/*
954c1994
GS
554=for apidoc mg_free
555
556Free any magic storage used by the SV. See C<sv_magic>.
557
558=cut
559*/
560
79072805 561int
864dbfa3 562Perl_mg_free(pTHX_ SV *sv)
79072805
LW
563{
564 MAGIC* mg;
565 MAGIC* moremagic;
7918f24d
NC
566
567 PERL_ARGS_ASSERT_MG_FREE;
568
79072805 569 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 570 moremagic = mg->mg_moremagic;
d9088386 571 mg_free_struct(sv, mg);
c826f41b 572 SvMAGIC_set(sv, moremagic);
79072805 573 }
b162af07 574 SvMAGIC_set(sv, NULL);
68f8932e 575 SvMAGICAL_off(sv);
79072805
LW
576 return 0;
577}
578
d9088386
Z
579/*
580=for apidoc Am|void|mg_free_type|SV *sv|int how
581
582Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
583
584=cut
585*/
586
587void
588Perl_mg_free_type(pTHX_ SV *sv, int how)
589{
590 MAGIC *mg, *prevmg, *moremg;
591 PERL_ARGS_ASSERT_MG_FREE_TYPE;
592 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
593 MAGIC *newhead;
594 moremg = mg->mg_moremagic;
595 if (mg->mg_type == how) {
596 /* temporarily move to the head of the magic chain, in case
597 custom free code relies on this historical aspect of mg_free */
598 if (prevmg) {
599 prevmg->mg_moremagic = moremg;
600 mg->mg_moremagic = SvMAGIC(sv);
601 SvMAGIC_set(sv, mg);
602 }
603 newhead = mg->mg_moremagic;
604 mg_free_struct(sv, mg);
605 SvMAGIC_set(sv, newhead);
606 mg = prevmg;
607 }
608 }
609 mg_magical(sv);
610}
611
79072805 612#include <signal.h>
79072805 613
942e002e 614U32
864dbfa3 615Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 616{
8772537c 617 PERL_UNUSED_ARG(sv);
6cef1e77 618
7918f24d
NC
619 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
620
0bd48802 621 if (PL_curpm) {
eb578fdb 622 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 623 if (rx) {
a678b0e4
YO
624 if (mg->mg_obj) { /* @+ */
625 /* return the number possible */
07bc277f 626 return RX_NPARENS(rx);
a678b0e4 627 } else { /* @- */
07bc277f 628 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
629
630 /* return the last filled */
f46c4081 631 while ( paren >= 0
07bc277f
NC
632 && (RX_OFFS(rx)[paren].start == -1
633 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 634 paren--;
a678b0e4
YO
635 return (U32)paren;
636 }
0bd48802 637 }
8f580fb8 638 }
ac27b0f5 639
942e002e 640 return (U32)-1;
6cef1e77
IZ
641}
642
6502e081
DM
643/* @-, @+ */
644
6cef1e77 645int
864dbfa3 646Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 647{
7918f24d
NC
648 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
649
0bd48802 650 if (PL_curpm) {
eb578fdb 651 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 652 if (rx) {
eb578fdb 653 const I32 paren = mg->mg_len;
a10eae29
FC
654 SSize_t s;
655 SSize_t t;
0bd48802
AL
656 if (paren < 0)
657 return 0;
07bc277f
NC
658 if (paren <= (I32)RX_NPARENS(rx) &&
659 (s = RX_OFFS(rx)[paren].start) != -1 &&
660 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 661 {
a10eae29 662 SSize_t i;
0bd48802
AL
663 if (mg->mg_obj) /* @+ */
664 i = t;
665 else /* @- */
666 i = s;
667
a10eae29 668 if (RX_MATCH_UTF8(rx)) {
07bc277f 669 const char * const b = RX_SUBBEG(rx);
0bd48802 670 if (b)
6502e081
DM
671 i = RX_SUBCOFFSET(rx) +
672 utf8_length((U8*)b,
673 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 674 }
727405f8 675
a10eae29 676 sv_setuv(sv, i);
232af1f8 677 return 0;
1aa99e6b 678 }
0bd48802 679 }
6cef1e77 680 }
232af1f8 681 sv_setsv(sv, NULL);
6cef1e77
IZ
682 return 0;
683}
684
6502e081
DM
685/* @-, @+ */
686
e4b89193 687int
a29d06ed
MG
688Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
689{
7918f24d 690 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 691 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
692 PERL_UNUSED_ARG(sv);
693 PERL_UNUSED_ARG(mg);
cb077ed2 694 Perl_croak_no_modify();
0dbb1585 695 NORETURN_FUNCTION_END;
a29d06ed
MG
696}
697
ad3296c6 698#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
699 if (SvPOK(sv)) { \
700 STRLEN len = SvCUR(sv); \
701 char * const p = SvPVX(sv); \
8e6b4db6
PC
702 while (len > 0 && isSPACE(p[len-1])) \
703 --len; \
704 SvCUR_set(sv, len); \
705 p[len] = '\0'; \
706 } \
ad3296c6
SH
707} STMT_END
708
8b850bd5
NC
709void
710Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
711{
7918f24d
NC
712 PERL_ARGS_ASSERT_EMULATE_COP_IO;
713
8b850bd5
NC
714 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
715 sv_setsv(sv, &PL_sv_undef);
716 else {
717 sv_setpvs(sv, "");
718 SvUTF8_off(sv);
719 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 720 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
721 assert(value);
722 sv_catsv(sv, value);
723 }
724 sv_catpvs(sv, "\0");
725 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 726 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
727 assert(value);
728 sv_catsv(sv, value);
729 }
730 }
731}
732
d9fe7d23
KW
733STATIC void
734S_fixup_errno_string(pTHX_ SV* sv)
735{
736 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
737 * Perl space. */
738
739 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
740
741 assert(SvOK(sv));
b35e4f8b
KW
742
743 if(strEQ(SvPVX(sv), "")) {
744 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
745 }
746 else {
d9fe7d23 747
d3c0b317
KW
748 /* In some locales the error string may come back as UTF-8, in which
749 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
750 * avoid as many possible backward compatibility issues as possible, we
751 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW
752 * an entirely invariant string. We assume that if the string looks
753 * like UTF-8, it really is UTF-8: "text in any other encoding that
754 * uses bytes with the high bit set is extremely unlikely to pass a
755 * UTF-8 validity test"
756 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
757 * potential that we will get it wrong however, especially on short
758 * error message text. (If it turns out to be necessary, we could also
759 * keep track if the current LC_MESSAGES locale is UTF-8) */
d3c0b317 760 if (! IN_BYTES /* respect 'use bytes' */
9f10db87 761 && ! is_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
d3c0b317
KW
762 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
763 {
764 SvUTF8_on(sv);
765 }
b35e4f8b 766 }
d9fe7d23
KW
767}
768
ad2de1b2
KW
769SV*
770Perl__get_encoding(pTHX)
771{
3e669301
KW
772 /* For core Perl use only: Returns the $^ENCODING or 'use encoding' in
773 * effect; NULL if none.
774 *
775 * $^ENCODING maps to PL_encoding, and is the old way to do things, and is
776 * retained for backwards compatibility. Now, there is a shadow variable
777 * ${^E_NCODING} set only by the encoding pragma, used to give this pragma
778 * lexical scope, unlike the global scope it (shudder) used to have. This
779 * variable maps to PL_lex_encoding. Again for backwards compatibility,
780 * PL_encoding has precedence over PL_lex_encoding. The hints hash is used
781 * to determine if PL_lex_encoding is in scope, and hence valid. The hints
782 * hash only accepts simple values, so we can't put an Encode object into
783 * it, so we put the object into the global, and put a simple boolean into
784 * the hints hash giving whether the global is valid or not */
785
c79dccf4 786 dVAR;
3e669301
KW
787 SV *is_encoding;
788
789 if (PL_encoding) {
790 return PL_encoding;
791 }
792
793 if (! PL_lex_encoding) {
794 return NULL;
795 }
796
797 is_encoding = cop_hints_fetch_pvs(PL_curcop, "encoding", 0);
798 if ( is_encoding
799 && is_encoding != &PL_sv_placeholder
800 && SvIOK(is_encoding)
801 && SvIV(is_encoding)) /* non-zero mean valid */
802 {
803 return PL_lex_encoding;
804 }
ad2de1b2 805
3e669301 806 return NULL;
ad2de1b2
KW
807}
808
25bbd826
CB
809#ifdef VMS
810#include <descrip.h>
811#include <starlet.h>
812#endif
813
79072805 814int
864dbfa3 815Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 816{
eb578fdb
KW
817 I32 paren;
818 const char *s = NULL;
819 REGEXP *rx;
823a54a3 820 const char * const remaining = mg->mg_ptr + 1;
e91d8259 821 char nextchar;
79072805 822
7918f24d
NC
823 PERL_ARGS_ASSERT_MAGIC_GET;
824
e91d8259 825 if (!mg->mg_ptr) {
e91d8259 826 paren = mg->mg_len;
e91d8259 827 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 828 do_numbuf_fetch:
e91d8259
NC
829 CALLREG_NUMBUF_FETCH(rx,paren,sv);
830 } else {
831 sv_setsv(sv,&PL_sv_undef);
832 }
833 return 0;
834 }
835
836 nextchar = *remaining;
79072805 837 switch (*mg->mg_ptr) {
748a9306 838 case '\001': /* ^A */
f2da823f
FC
839 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
840 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT
841 if (SvTAINTED(PL_bodytarget))
842 SvTAINTED_on(sv);
748a9306 843 break;
e5218da5 844 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 845 if (nextchar == '\0') {
e5218da5
GA
846 sv_setiv(sv, (IV)PL_minus_c);
847 }
823a54a3 848 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
849 sv_setiv(sv, (IV)STATUS_NATIVE);
850 }
49460fe6
NIS
851 break;
852
79072805 853 case '\004': /* ^D */
aea4f609 854 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 855 break;
28f23441 856 case '\005': /* ^E */
6c6eab55
KW
857 if (nextchar != '\0') {
858 if (strEQ(remaining, "NCODING"))
ad2de1b2 859 sv_setsv(sv, _get_encoding());
199670db
FC
860 else if (strEQ(remaining, "_NCODING"))
861 sv_setsv(sv, NULL);
4f4ff3a7 862 break;
6c6eab55 863 }
4f4ff3a7
KW
864
865#if defined(VMS) || defined(OS2) || defined(WIN32)
866# if defined(VMS)
2a99ff86
KW
867 {
868 char msg[255];
869 $DESCRIPTOR(msgdsc,msg);
870 sv_setnv(sv,(NV) vaxc$errno);
871 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
872 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
873 else
874 sv_setpvs(sv,"");
875 }
4b645107 876#elif defined(OS2)
2a99ff86
KW
877 if (!(_emx_env & 0x200)) { /* Under DOS */
878 sv_setnv(sv, (NV)errno);
2c6ee1a7 879 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
880 } else {
881 if (errno != errno_isOS2) {
882 const int tmp = _syserrno();
883 if (tmp) /* 2nd call to _syserrno() makes it 0 */
884 Perl_rc = tmp;
885 }
886 sv_setnv(sv, (NV)Perl_rc);
887 sv_setpv(sv, os2error(Perl_rc));
888 }
1534c6f5 889 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
890 fixup_errno_string(sv);
891 }
4f4ff3a7 892# elif defined(WIN32)
2a99ff86
KW
893 {
894 const DWORD dwErr = GetLastError();
895 sv_setnv(sv, (NV)dwErr);
896 if (dwErr) {
897 PerlProc_GetOSError(sv, dwErr);
2efab60d 898 fixup_errno_string(sv);
2a99ff86
KW
899 }
900 else
901 sv_setpvs(sv, "");
902 SetLastError(dwErr);
903 }
4f4ff3a7
KW
904# else
905# error Missing code for platform
906# endif
2a99ff86
KW
907 SvRTRIM(sv);
908 SvNOK_on(sv); /* what a wonderful hack! */
909 break;
4f4ff3a7
KW
910#endif /* End of platforms with special handling for $^E; others just fall
911 through to $! */
46f3e16c
KW
912
913 case '!':
914 {
5f1b979d 915 dSAVE_ERRNO;
46f3e16c 916#ifdef VMS
5f1b979d 917 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 918#else
5f1b979d 919 sv_setnv(sv, (NV)errno);
46f3e16c
KW
920#endif
921#ifdef OS2
5f1b979d
KW
922 if (errno == errno_isOS2 || errno == errno_isOS2_set)
923 sv_setpv(sv, os2error(Perl_rc));
924 else
46f3e16c 925#endif
5f1b979d
KW
926 if (! errno) {
927 sv_setpvs(sv, "");
46f3e16c 928 }
5f1b979d
KW
929 else {
930
931 /* Strerror can return NULL on some platforms, which will
932 * result in 'sv' not being considered SvOK. The SvNOK_on()
933 * below will cause just the number part to be valid */
2c6ee1a7 934 sv_setpv(sv, my_strerror(errno));
5f1b979d
KW
935 if (SvOK(sv)) {
936 fixup_errno_string(sv);
937 }
938 }
939 RESTORE_ERRNO;
46f3e16c
KW
940 }
941
942 SvRTRIM(sv);
943 SvNOK_on(sv); /* what a wonderful hack! */
944 break;
945
79072805 946 case '\006': /* ^F */
3280af22 947 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 948 break;
9ebf26ad
FR
949 case '\007': /* ^GLOBAL_PHASE */
950 if (strEQ(remaining, "LOBAL_PHASE")) {
951 sv_setpvn(sv, PL_phase_names[PL_phase],
952 strlen(PL_phase_names[PL_phase]));
953 }
954 break;
a0d0e21e 955 case '\010': /* ^H */
3280af22 956 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 957 break;
9d116dd7 958 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 959 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 960 break;
8561ea1d
FC
961 case '\014': /* ^LAST_FH */
962 if (strEQ(remaining, "AST_FH")) {
963 if (PL_last_in_gv) {
964 assert(isGV_with_GP(PL_last_in_gv));
965 SV_CHECK_THINKFIRST_COW_DROP(sv);
966 prepare_SV_for_RV(sv);
967 SvOK_off(sv);
968 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
969 SvROK_on(sv);
970 sv_rvweaken(sv);
971 }
972 else sv_setsv_nomg(sv, NULL);
973 }
974 break;
ac27b0f5 975 case '\017': /* ^O & ^OPEN */
823a54a3 976 if (nextchar == '\0') {
ac27b0f5 977 sv_setpv(sv, PL_osname);
3511154c
DM
978 SvTAINTED_off(sv);
979 }
823a54a3 980 else if (strEQ(remaining, "PEN")) {
8b850bd5 981 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 982 }
28f23441 983 break;
9ebf26ad 984 case '\020':
a6d0b1b5 985 sv_setiv(sv, (IV)PL_perldb);
79072805 986 break;
fb73857a 987 case '\023': /* ^S */
a6d0b1b5 988 {
bc177e6b 989 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 990 SvOK_off(sv);
3280af22 991 else if (PL_in_eval)
6dc8a9e4 992 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
993 else
994 sv_setiv(sv, 0);
d58bf5aa 995 }
fb73857a 996 break;
79072805 997 case '\024': /* ^T */
823a54a3 998 if (nextchar == '\0') {
88e89b8a 999#ifdef BIG_TIME
7c36658b 1000 sv_setnv(sv, PL_basetime);
88e89b8a 1001#else
7c36658b 1002 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1003#endif
7c36658b 1004 }
823a54a3 1005 else if (strEQ(remaining, "AINT"))
284167a5
SM
1006 sv_setiv(sv, TAINTING_get
1007 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1008 : 0);
7c36658b 1009 break;
e07ea26a 1010 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1011 if (strEQ(remaining, "NICODE"))
a05d7ebb 1012 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1013 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1014 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1015 else if (strEQ(remaining, "TF8CACHE"))
1016 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1017 break;
1018 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1019 if (nextchar == '\0')
4438c4b7 1020 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 1021 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1022 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1023 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1024 }
1025 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC
1026 sv_setsv(sv, &PL_sv_undef);
1027 break;
013b78e8 1028 }
d3a7d8c7 1029 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
1030 /* Get the bit mask for $warnings::Bits{all}, because
1031 * it could have been extended by warnings::register */
4bac9ae4
CS
1032 HV * const bits = get_hv("warnings::Bits", 0);
1033 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1034 if (bits_all)
1035 sv_copypv(sv, *bits_all);
1036 else
1037 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1038 }
4438c4b7 1039 else {
72dc9ed5
NC
1040 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1041 *PL_compiling.cop_warnings);
ac27b0f5 1042 }
4438c4b7 1043 }
79072805 1044 break;
79072805 1045 case '+':
aaa362c4 1046 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1047 paren = RX_LASTPAREN(rx);
1048 if (paren)
1049 goto do_numbuf_fetch;
79072805 1050 }
3280af22 1051 sv_setsv(sv,&PL_sv_undef);
79072805 1052 break;
a01268b5
JH
1053 case '\016': /* ^N */
1054 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1055 paren = RX_LASTCLOSEPAREN(rx);
1056 if (paren)
1057 goto do_numbuf_fetch;
a01268b5
JH
1058 }
1059 sv_setsv(sv,&PL_sv_undef);
1060 break;
79072805 1061 case '.':
3280af22 1062 if (GvIO(PL_last_in_gv)) {
357c8808 1063 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1064 }
79072805
LW
1065 break;
1066 case '?':
809a5acc 1067 {
809a5acc 1068 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1069#ifdef COMPLEX_STATUS
41cb7b2b 1070 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1071 LvTARGOFF(sv) = PL_statusvalue;
1072 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1073#endif
809a5acc 1074 }
79072805
LW
1075 break;
1076 case '^':
acbe1b9d 1077 if (GvIOp(PL_defoutgv))
099be4f1 1078 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1079 if (s)
1080 sv_setpv(sv,s);
1081 else {
3280af22 1082 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1083 sv_catpvs(sv,"_TOP");
79072805
LW
1084 }
1085 break;
1086 case '~':
acbe1b9d 1087 if (GvIOp(PL_defoutgv))
0daa599b 1088 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1089 if (!s)
3280af22 1090 s = GvENAME(PL_defoutgv);
79072805
LW
1091 sv_setpv(sv,s);
1092 break;
79072805 1093 case '=':
099be4f1 1094 if (GvIO(PL_defoutgv))
0daa599b 1095 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1096 break;
1097 case '-':
099be4f1 1098 if (GvIO(PL_defoutgv))
0daa599b 1099 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1100 break;
1101 case '%':
099be4f1 1102 if (GvIO(PL_defoutgv))
0daa599b 1103 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1104 break;
79072805 1105 case ':':
79072805
LW
1106 case '/':
1107 break;
1108 case '[':
e1dccc0d 1109 sv_setiv(sv, 0);
79072805
LW
1110 break;
1111 case '|':
099be4f1 1112 if (GvIO(PL_defoutgv))
0daa599b 1113 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1114 break;
79072805 1115 case '\\':
b2ce0fda 1116 if (PL_ors_sv)
f28098ff 1117 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS
1118 else
1119 sv_setsv(sv, &PL_sv_undef);
79072805 1120 break;
0e219455 1121 case '$': /* $$ */
9cdac2a2
FC
1122 {
1123 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1124 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1125 /* never set manually, or at least not since last fork */
1126 sv_setiv(sv, pid);
19db9fb7
Z
1127 /* never unsafe, even if reading in a tainted expression */
1128 SvTAINTED_off(sv);
1129 }
9cdac2a2
FC
1130 /* else a value has been assigned manually, so do nothing */
1131 }
0e219455 1132 break;
79072805 1133 case '<':
dfff4baf 1134 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1135 break;
1136 case '>':
dfff4baf 1137 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1138 break;
1139 case '(':
dfff4baf 1140 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1141 goto add_groups;
1142 case ')':
dfff4baf 1143 sv_setgid(sv, PerlProc_getegid());
79072805 1144 add_groups:
79072805 1145#ifdef HAS_GETGROUPS
79072805 1146 {
57d7c65e 1147 Groups_t *gary = NULL;
375ed12a
JH
1148 I32 i;
1149 I32 num_groups = getgroups(0, gary);
1150 if (num_groups > 0) {
1151 Newx(gary, num_groups, Groups_t);
1152 num_groups = getgroups(num_groups, gary);
1153 for (i = 0; i < num_groups; i++)
1154 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1155 Safefree(gary);
1156 }
79072805 1157 }
155aba94 1158 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1159#endif
79072805 1160 break;
79072805
LW
1161 case '0':
1162 break;
1163 }
a0d0e21e 1164 return 0;
79072805
LW
1165}
1166
1167int
864dbfa3 1168Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1169{
8772537c 1170 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1171
7918f24d
NC
1172 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1173
79072805 1174 if (uf && uf->uf_val)
24f81a43 1175 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1176 return 0;
1177}
1178
1179int
864dbfa3 1180Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1181{
9ae3433d 1182 STRLEN len = 0, klen;
12033064 1183 const char * const key = MgPV_const(mg,klen);
888a67f6 1184 const char *s = "";
1e422769 1185
7918f24d
NC
1186 PERL_ARGS_ASSERT_MAGIC_SETENV;
1187
613c63b4 1188 SvGETMAGIC(sv);
12033064 1189 if (SvOK(sv)) {
613c63b4
CS
1190 /* defined environment variables are byte strings; unfortunately
1191 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1192 (void)SvPV_force_nomg_nolen(sv);
1193 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1194 if (SvUTF8(sv)) {
1195 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1196 SvUTF8_off(sv);
1197 }
1198 s = SvPVX(sv);
1199 len = SvCUR(sv);
12033064
CS
1200 }
1201 my_setenv(key, s); /* does the deed */
1202
a0d0e21e
LW
1203#ifdef DYNAMIC_ENV_FETCH
1204 /* We just undefd an environment var. Is a replacement */
1205 /* waiting in the wings? */
1206 if (!len) {
6bd66ee9 1207 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1208 if (valp)
4ab59fcc 1209 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1210 }
1211#endif
1e422769 1212
39e571d4 1213#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1214 /* And you'll never guess what the dog had */
1215 /* in its mouth... */
284167a5 1216 if (TAINTING_get) {
1e422769
PP
1217 MgTAINTEDDIR_off(mg);
1218#ifdef VMS
6bd66ee9 1219 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1220 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1221 int i = 0, j = 0;
1222
6fca0082 1223 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1224 elt = eltbuf;
1e422769
PP
1225 do { /* DCL$PATH may be a search list */
1226 while (1) { /* as may dev portion of any element */
1227 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1228 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1229 cando_by_name(S_IWUSR,0,elt) ) {
1230 MgTAINTEDDIR_on(mg);
1231 return 0;
1232 }
1233 }
bd61b366 1234 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1235 *cp = '\0';
1236 if (my_trnlnm(elt, eltbuf, j++))
1237 elt = eltbuf;
1238 else
1239 break;
1240 }
1241 j = 0;
1242 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1243 }
1244#endif /* VMS */
12033064 1245 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1246 const char * const strend = s + len;
463ee0b2
LW
1247
1248 while (s < strend) {
96827780 1249 char tmpbuf[256];
c623ac67 1250 Stat_t st;
5f74f29c 1251 I32 i;
f5a63d97
AL
1252#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1253 const char path_sep = '|';
1254#else
1255 const char path_sep = ':';
1256#endif
96827780 1257 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1258 s, strend, path_sep, &i);
463ee0b2 1259 s++;
bb7a0f54 1260 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1261#ifdef VMS
1262 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1263#else
1264 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1265#endif
c6ed36e1 1266 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1267 MgTAINTEDDIR_on(mg);
1e422769
PP
1268 return 0;
1269 }
463ee0b2 1270 }
79072805
LW
1271 }
1272 }
39e571d4 1273#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1274
79072805
LW
1275 return 0;
1276}
1277
1278int
864dbfa3 1279Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1280{
7918f24d 1281 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1282 PERL_UNUSED_ARG(sv);
bd61b366 1283 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1284 return 0;
1285}
1286
88e89b8a 1287int
864dbfa3 1288Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1289{
7918f24d 1290 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1291 PERL_UNUSED_ARG(mg);
b0269e46 1292#if defined(VMS)
cea2e8a9 1293 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1294#else
3280af22 1295 if (PL_localizing) {
fb73857a 1296 HE* entry;
b0269e46 1297 my_clearenv();
85fbaab2
NC
1298 hv_iterinit(MUTABLE_HV(sv));
1299 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1300 I32 keylen;
1301 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1302 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1303 }
1304 }
1305#endif
1306 return 0;
1307}
1308
1309int
864dbfa3 1310Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1311{
7918f24d 1312 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1313 PERL_UNUSED_ARG(sv);
1314 PERL_UNUSED_ARG(mg);
b0269e46
AB
1315#if defined(VMS)
1316 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1317#else
1318 my_clearenv();
1319#endif
3e3baf6d 1320 return 0;
66b1d557
HM
1321}
1322
64ca3a65 1323#ifndef PERL_MICRO
2d4fcd5e
AJ
1324#ifdef HAS_SIGPROCMASK
1325static void
1326restore_sigmask(pTHX_ SV *save_sv)
1327{
0bd48802 1328 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1329 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1330}
1331#endif
66b1d557 1332int
864dbfa3 1333Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1334{
88e89b8a 1335 /* Are we fetching a signal entry? */
708854f2 1336 int i = (I16)mg->mg_private;
7918f24d
NC
1337
1338 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1339
708854f2 1340 if (!i) {
84c7b88c
BF
1341 STRLEN siglen;
1342 const char * sig = MgPV_const(mg, siglen);
1343 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1344 }
1345
e02bfb16 1346 if (i > 0) {
22c35a8c
GS
1347 if(PL_psig_ptr[i])
1348 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1349 else {
46da273f 1350 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1351#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1352 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1353 sigstate = SIG_IGN;
2e34cc90
CL
1354#endif
1355#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1356 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1357 sigstate = SIG_DFL;
85b332e2 1358#endif
88e89b8a 1359 /* cache state so we don't fetch it again */
8aad04aa 1360 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1361 sv_setpvs(sv,"IGNORE");
88e89b8a 1362 else
3280af22 1363 sv_setsv(sv,&PL_sv_undef);
46da273f 1364 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1365 SvTEMP_off(sv);
1366 }
1367 }
1368 return 0;
1369}
1370int
864dbfa3 1371Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1372{
7918f24d 1373 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1374
38a124f0 1375 magic_setsig(NULL, mg);
179c85a2 1376 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1377}
3d37d572 1378
0a8e0eff 1379Signal_t
8aad04aa 1380#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1381Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1382#else
0a8e0eff 1383Perl_csighandler(int sig)
8aad04aa 1384#endif
0a8e0eff 1385{
1018e26f
NIS
1386#ifdef PERL_GET_SIG_CONTEXT
1387 dTHXa(PERL_GET_SIG_CONTEXT);
1388#else
85b332e2
CL
1389 dTHX;
1390#endif
1271a1be 1391#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1392#if defined(__cplusplus) && defined(__GNUC__)
1393 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1394 * parameters would be warned about. */
1395 PERL_UNUSED_ARG(sip);
1396 PERL_UNUSED_ARG(uap);
1397#endif
1271a1be 1398#endif
23ada85b 1399#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1400 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1401 if (PL_sig_ignoring[sig]) return;
85b332e2 1402#endif
2e34cc90 1403#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1404 if (PL_sig_defaulting[sig])
2e34cc90
CL
1405#ifdef KILL_BY_SIGPRC
1406 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1407#else
1408 exit(1);
1409#endif
1410#endif
406878dd 1411 if (
853d2c32
RGS
1412#ifdef SIGILL
1413 sig == SIGILL ||
1414#endif
1415#ifdef SIGBUS
1416 sig == SIGBUS ||
1417#endif
1418#ifdef SIGSEGV
1419 sig == SIGSEGV ||
1420#endif
1421 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1422 /* Call the perl level handler now--
31c91b43 1423 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1424#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1425 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1426#else
1427 (*PL_sighandlerp)(sig);
92807b6d 1428#endif
406878dd 1429 else {
31c91b43 1430 if (!PL_psig_pend) return;
406878dd
GA
1431 /* Set a flag to say this signal is pending, that is awaiting delivery after
1432 * the current Perl opcode completes */
1433 PL_psig_pend[sig]++;
1434
1435#ifndef SIG_PENDING_DIE_COUNT
1436# define SIG_PENDING_DIE_COUNT 120
1437#endif
fe13d51d 1438 /* Add one to say _a_ signal is pending */
406878dd
GA
1439 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1440 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1441 (unsigned long)SIG_PENDING_DIE_COUNT);
1442 }
0a8e0eff
NIS
1443}
1444
2e34cc90
CL
1445#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1446void
1447Perl_csighandler_init(void)
1448{
1449 int sig;
27da23d5 1450 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1451
1452 for (sig = 1; sig < SIG_SIZE; sig++) {
1453#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1454 dTHX;
27da23d5 1455 PL_sig_defaulting[sig] = 1;
5c1546dc 1456 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1457#endif
1458#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1459 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1460#endif
1461 }
27da23d5 1462 PL_sig_handlers_initted = 1;
2e34cc90
CL
1463}
1464#endif
1465
7fe50b8b
LT
1466#if defined HAS_SIGPROCMASK
1467static void
1468unblock_sigmask(pTHX_ void* newset)
1469{
dc3bf405 1470 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1471 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1472}
1473#endif
1474
0a8e0eff
NIS
1475void
1476Perl_despatch_signals(pTHX)
1477{
1478 int sig;
1479 PL_sig_pending = 0;
1480 for (sig = 1; sig < SIG_SIZE; sig++) {
1481 if (PL_psig_pend[sig]) {
d0166017 1482 dSAVE_ERRNO;
7fe50b8b 1483#ifdef HAS_SIGPROCMASK
55534442
LT
1484 /* From sigaction(2) (FreeBSD man page):
1485 * | Signal routines normally execute with the signal that
1486 * | caused their invocation blocked, but other signals may
1487 * | yet occur.
1488 * Emulation of this behavior (from within Perl) is enabled
1489 * using sigprocmask
1490 */
1491 int was_blocked;
1492 sigset_t newset, oldset;
1493
1494 sigemptyset(&newset);
1495 sigaddset(&newset, sig);
1496 sigprocmask(SIG_BLOCK, &newset, &oldset);
1497 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1498 if (!was_blocked) {
1499 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1500 ENTER;
1501 SAVEFREESV(save_sv);
1502 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1503 }
55534442 1504#endif
25da4428 1505 PL_psig_pend[sig] = 0;
6e324d09 1506#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1507 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1508#else
1509 (*PL_sighandlerp)(sig);
92807b6d 1510#endif
7fe50b8b 1511#ifdef HAS_SIGPROCMASK
55534442 1512 if (!was_blocked)
7fe50b8b 1513 LEAVE;
55534442 1514#endif
d0166017 1515 RESTORE_ERRNO;
0a8e0eff
NIS
1516 }
1517 }
1518}
1519
38a124f0 1520/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1521int
864dbfa3 1522Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1523{
27da23d5 1524 dVAR;
79072805 1525 I32 i;
cbbf8932 1526 SV** svp = NULL;
2d4fcd5e
AJ
1527 /* Need to be careful with SvREFCNT_dec(), because that can have side
1528 * effects (due to closures). We must make sure that the new disposition
1529 * is in place before it is called.
1530 */
cbbf8932 1531 SV* to_dec = NULL;
e72dc28c 1532 STRLEN len;
2d4fcd5e
AJ
1533#ifdef HAS_SIGPROCMASK
1534 sigset_t set, save;
1535 SV* save_sv;
1536#endif
eb578fdb 1537 const char *s = MgPV_const(mg,len);
7918f24d
NC
1538
1539 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1540
748a9306 1541 if (*s == '_') {
84c7b88c 1542 if (memEQs(s, len, "__DIE__"))
3280af22 1543 svp = &PL_diehook;
84c7b88c 1544 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1545 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1546 /* Merge the existing behaviours, which are as follows:
1547 magic_setsig, we always set svp to &PL_warnhook
1548 (hence we always change the warnings handler)
1549 For magic_clearsig, we don't change the warnings handler if it's
1550 set to the &PL_warnhook. */
3280af22 1551 svp = &PL_warnhook;
84c7b88c
BF
1552 } else if (sv) {
1553 SV *tmp = sv_newmortal();
1554 Perl_croak(aTHX_ "No such hook: %s",
1555 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1556 }
748a9306 1557 i = 0;
38a124f0 1558 if (svp && *svp) {
9289f461
RGS
1559 if (*svp != PERL_WARNHOOK_FATAL)
1560 to_dec = *svp;
cbbf8932 1561 *svp = NULL;
4633a7c4 1562 }
748a9306
LW
1563 }
1564 else {
708854f2
NC
1565 i = (I16)mg->mg_private;
1566 if (!i) {
84c7b88c 1567 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1568 mg->mg_private = (U16)i;
708854f2 1569 }
86d86cad 1570 if (i <= 0) {
84c7b88c
BF
1571 if (sv) {
1572 SV *tmp = sv_newmortal();
1573 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1574 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1575 }
748a9306
LW
1576 return 0;
1577 }
2d4fcd5e
AJ
1578#ifdef HAS_SIGPROCMASK
1579 /* Avoid having the signal arrive at a bad time, if possible. */
1580 sigemptyset(&set);
1581 sigaddset(&set,i);
1582 sigprocmask(SIG_BLOCK, &set, &save);
1583 ENTER;
9ff8e806 1584 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1585 SAVEFREESV(save_sv);
1586 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1587#endif
1588 PERL_ASYNC_CHECK();
2e34cc90 1589#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1590 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1591#endif
23ada85b 1592#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1593 PL_sig_ignoring[i] = 0;
85b332e2 1594#endif
2e34cc90 1595#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1596 PL_sig_defaulting[i] = 0;
2e34cc90 1597#endif
2d4fcd5e 1598 to_dec = PL_psig_ptr[i];
38a124f0
NC
1599 if (sv) {
1600 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1601 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1602
1603 /* Signals don't change name during the program's execution, so once
1604 they're cached in the appropriate slot of PL_psig_name, they can
1605 stay there.
1606
1607 Ideally we'd find some way of making SVs at (C) compile time, or
1608 at least, doing most of the work. */
1609 if (!PL_psig_name[i]) {
1610 PL_psig_name[i] = newSVpvn(s, len);
1611 SvREADONLY_on(PL_psig_name[i]);
1612 }
38a124f0 1613 } else {
79fd3822 1614 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1615 PL_psig_name[i] = NULL;
1616 PL_psig_ptr[i] = NULL;
1617 }
748a9306 1618 }
38a124f0 1619 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1620 if (i) {
5c1546dc 1621 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1622 }
748a9306 1623 else
b37c2d43 1624 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1625 } else {
9dfa190b
NC
1626 if (sv && SvOK(sv)) {
1627 s = SvPV_force(sv, len);
1628 } else {
1629 sv = NULL;
1630 }
84c7b88c 1631 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1632 if (i) {
23ada85b 1633#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1634 PL_sig_ignoring[i] = 1;
1635 (void)rsignal(i, PL_csighandlerp);
85b332e2 1636#else
9dfa190b 1637 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1638#endif
9dfa190b 1639 }
2d4fcd5e 1640 }
84c7b88c 1641 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1642 if (i) {
2e34cc90 1643#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1644 PL_sig_defaulting[i] = 1;
1645 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1646#else
9dfa190b 1647 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1648#endif
9dfa190b
NC
1649 }
1650 }
1651 else {
1652 /*
1653 * We should warn if HINT_STRICT_REFS, but without
1654 * access to a known hint bit in a known OP, we can't
1655 * tell whether HINT_STRICT_REFS is in force or not.
1656 */
1657 if (!strchr(s,':') && !strchr(s,'\''))
1658 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1659 SV_GMAGIC);
1660 if (i)
1661 (void)rsignal(i, PL_csighandlerp);
1662 else
1663 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1664 }
748a9306 1665 }
9dfa190b 1666
2d4fcd5e
AJ
1667#ifdef HAS_SIGPROCMASK
1668 if(i)
1669 LEAVE;
1670#endif
ef8d46e8 1671 SvREFCNT_dec(to_dec);
79072805
LW
1672 return 0;
1673}
64ca3a65 1674#endif /* !PERL_MICRO */
79072805
LW
1675
1676int
864dbfa3 1677Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1678{
7918f24d 1679 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1680 PERL_UNUSED_ARG(sv);
e1a479c5 1681
89c14e2e 1682 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1683 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1684 return 0;
1685
0e446081 1686 return magic_clearisa(NULL, mg);
463ee0b2
LW
1687}
1688
0e446081 1689/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1690int
52b45067
RD
1691Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1692{
52b45067 1693 HV* stash;
7918f24d
NC
1694 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1695
52b45067 1696 /* Bail out if destruction is going on */
627364f1 1697 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1698
0e446081
NC
1699 if (sv)
1700 av_clear(MUTABLE_AV(sv));
52b45067 1701
6624142a
FC
1702 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1703 /* This occurs with setisa_elem magic, which calls this
1704 same function. */
1705 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1706
316ebaf2 1707 assert(mg);
6624142a
FC
1708 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1709 SV **svp = AvARRAY((AV *)mg->mg_obj);
1710 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1711 while (items--) {
1712 stash = GvSTASH((GV *)*svp++);
1713 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1714 }
1715
1716 return 0;
1717 }
1718
52b45067 1719 stash = GvSTASH(
6624142a 1720 (const GV *)mg->mg_obj
52b45067
RD
1721 );
1722
00169e2c
FC
1723 /* The stash may have been detached from the symbol table, so check its
1724 name before doing anything. */
1725 if (stash && HvENAME_get(stash))
5562fa71 1726 mro_isa_changed_in(stash);
52b45067
RD
1727
1728 return 0;
1729}
1730
1731int
864dbfa3 1732Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1733{
85fbaab2 1734 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1735 I32 i = 0;
7918f24d
NC
1736
1737 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1738 PERL_UNUSED_ARG(mg);
7719e241 1739
6ff81951 1740 if (hv) {
497b47a8 1741 (void) hv_iterinit(hv);
ad64d0ec 1742 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1743 i = HvUSEDKEYS(hv);
497b47a8
JH
1744 else {
1745 while (hv_iternext(hv))
1746 i++;
1747 }
6ff81951
GS
1748 }
1749
1750 sv_setiv(sv, (IV)i);
1751 return 0;
1752}
1753
1754int
864dbfa3 1755Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1756{
7918f24d 1757 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1758 PERL_UNUSED_ARG(mg);
946ec16e 1759 if (LvTARG(sv)) {
85fbaab2 1760 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1761 }
1762 return 0;
ac27b0f5 1763}
946ec16e 1764
efaf3674
DM
1765/*
1766=for apidoc magic_methcall
1767
1768Invoke a magic method (like FETCH).
1769
2baee27b
FC
1770C<sv> and C<mg> are the tied thingy and the tie magic.
1771
1772C<meth> is the name of the method to call.
1773
1774C<argc> is the number of args (in addition to $self) to pass to the method.
1775
1776The C<flags> can be:
1777
1778 G_DISCARD invoke method with G_DISCARD flag and don't
1779 return a value
1780 G_UNDEF_FILL fill the stack with argc pointers to
1781 PL_sv_undef
1782
1783The arguments themselves are any values following the C<flags> argument.
efaf3674
DM
1784
1785Returns the SV (if any) returned by the method, or NULL on failure.
1786
1787
1788=cut
1789*/
1790
1791SV*
36925d9e 1792Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1793 U32 argc, ...)
a0d0e21e
LW
1794{
1795 dSP;
efaf3674 1796 SV* ret = NULL;
463ee0b2 1797
7918f24d
NC
1798 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1799
efaf3674 1800 ENTER;
d1d7a15d
NC
1801
1802 if (flags & G_WRITING_TO_STDERR) {
1803 SAVETMPS;
1804
d1d7a15d
NC
1805 SAVESPTR(PL_stderrgv);
1806 PL_stderrgv = NULL;
1807 }
1808
efaf3674 1809 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1810 PUSHMARK(SP);
efaf3674 1811
67549bd2
NC
1812 EXTEND(SP, argc+1);
1813 PUSHs(SvTIED_obj(sv, mg));
1814 if (flags & G_UNDEF_FILL) {
1815 while (argc--) {
efaf3674 1816 PUSHs(&PL_sv_undef);
93965878 1817 }
67549bd2 1818 } else if (argc > 0) {
046b0c7d
NC
1819 va_list args;
1820 va_start(args, argc);
1821
1822 do {
1823 SV *const sv = va_arg(args, SV *);
1824 PUSHs(sv);
1825 } while (--argc);
1826
1827 va_end(args);
88e89b8a 1828 }
463ee0b2 1829 PUTBACK;
efaf3674 1830 if (flags & G_DISCARD) {
36925d9e 1831 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1832 }
1833 else {
36925d9e 1834 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1835 ret = *PL_stack_sp--;
1836 }
1837 POPSTACK;
d1d7a15d
NC
1838 if (flags & G_WRITING_TO_STDERR)
1839 FREETMPS;
efaf3674
DM
1840 LEAVE;
1841 return ret;
1842}
1843
efaf3674 1844/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1845
efaf3674 1846STATIC SV*
36925d9e 1847S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1848 int n, SV *val)
1849{
efaf3674
DM
1850 SV* arg1 = NULL;
1851
1852 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1853
1854 if (mg->mg_ptr) {
1855 if (mg->mg_len >= 0) {
db4b3a1d 1856 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1857 }
1858 else if (mg->mg_len == HEf_SVKEY)
1859 arg1 = MUTABLE_SV(mg->mg_ptr);
1860 }
1861 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1862 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1863 sv_2mortal(arg1);
1864 }
1865 if (!arg1) {
046b0c7d 1866 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1867 }
046b0c7d 1868 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1869}
1870
76e3520e 1871STATIC int
36925d9e 1872S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1873{
efaf3674 1874 SV* ret;
463ee0b2 1875
7918f24d
NC
1876 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1877
efaf3674
DM
1878 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1879 if (ret)
1880 sv_setsv(sv, ret);
a0d0e21e
LW
1881 return 0;
1882}
463ee0b2 1883
a0d0e21e 1884int
864dbfa3 1885Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1886{
7918f24d
NC
1887 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1888
fd69380d 1889 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1890 mg->mg_flags |= MGf_GSKIP;
36925d9e 1891 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1892 return 0;
1893}
1894
1895int
864dbfa3 1896Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1897{
b112cff9
DM
1898 MAGIC *tmg;
1899 SV *val;
7918f24d
NC
1900
1901 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1902
b112cff9
DM
1903 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1904 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1905 * public flags indicate its value based on copying from $val. Doing
1906 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1907 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1908 * wrong if $val happened to be tainted, as sv hasn't got magic
1909 * enabled, even though taint magic is in the chain. In which case,
1910 * fake up a temporary tainted value (this is easier than temporarily
1911 * re-enabling magic on sv). */
1912
284167a5 1913 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1914 && (tmg->mg_len & 1))
1915 {
1916 val = sv_mortalcopy(sv);
1917 SvTAINTED_on(val);
1918 }
1919 else
1920 val = sv;
1921
36925d9e 1922 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1923 return 0;
1924}
1925
1926int
864dbfa3 1927Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1928{
7918f24d
NC
1929 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1930
4c13be3f 1931 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1932 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1933}
463ee0b2 1934
93965878
NIS
1935
1936U32
864dbfa3 1937Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1938{
22846ab4 1939 I32 retval = 0;
efaf3674 1940 SV* retsv;
93965878 1941
7918f24d
NC
1942 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1943
36925d9e 1944 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1945 if (retsv) {
1946 retval = SvIV(retsv)-1;
22846ab4
AB
1947 if (retval < -1)
1948 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1949 }
22846ab4 1950 return (U32) retval;
93965878
NIS
1951}
1952
cea2e8a9
GS
1953int
1954Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1955{
7918f24d
NC
1956 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1957
36925d9e 1958 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1959 return 0;
1960}
1961
1962int
864dbfa3 1963Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1964{
efaf3674 1965 SV* ret;
463ee0b2 1966
7918f24d
NC
1967 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1968
36925d9e
RZ
1969 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1970 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1971 if (ret)
1972 sv_setsv(key,ret);
79072805
LW
1973 return 0;
1974}
1975
1976int
1146e912 1977Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1978{
7918f24d
NC
1979 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1980
36925d9e 1981 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1982}
a0d0e21e 1983
a3bcc51e
TP
1984SV *
1985Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1986{
5fcbf73d 1987 SV *retval;
ad64d0ec
NC
1988 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1989 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1990
7918f24d
NC
1991 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1992
a3bcc51e
TP
1993 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1994 SV *key;
bfcb3514 1995 if (HvEITER_get(hv))
a3bcc51e
TP
1996 /* we are in an iteration so the hash cannot be empty */
1997 return &PL_sv_yes;
1998 /* no xhv_eiter so now use FIRSTKEY */
1999 key = sv_newmortal();
ad64d0ec 2000 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2001 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2002 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2003 }
2004
2005 /* there is a SCALAR method that we can call */
36925d9e 2006 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2007 if (!retval)
5fcbf73d 2008 retval = &PL_sv_undef;
a3bcc51e
TP
2009 return retval;
2010}
2011
a0d0e21e 2012int
864dbfa3 2013Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2014{
089b5c60 2015 SV **svp;
7918f24d
NC
2016
2017 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2018
089b5c60
NC
2019 /* The magic ptr/len for the debugger's hash should always be an SV. */
2020 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2021 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 2022 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2023 }
2024
2025 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2026 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2027 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2028 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2029
8772537c 2030 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2031 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2032 if (o) {
2033#ifdef PERL_DEBUG_READONLY_OPS
2034 Slab_to_rw(OpSLAB(o));
2035#endif
2036 /* set or clear breakpoint in the relevant control op */
089b5c60 2037 if (SvTRUE(sv))
88df5f01 2038 o->op_flags |= OPf_SPECIAL;
8772537c 2039 else
88df5f01
FC
2040 o->op_flags &= ~OPf_SPECIAL;
2041#ifdef PERL_DEBUG_READONLY_OPS
2042 Slab_to_ro(OpSLAB(o));
2043#endif
8772537c 2044 }
5df8de69 2045 }
79072805
LW
2046 return 0;
2047}
2048
2049int
8772537c 2050Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2051{
502c6561 2052 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2053
2054 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2055
83bf042f 2056 if (obj) {
e1dccc0d 2057 sv_setiv(sv, AvFILL(obj));
83bf042f 2058 } else {
d4a823b3 2059 sv_setsv(sv, NULL);
83bf042f 2060 }
79072805
LW
2061 return 0;
2062}
2063
2064int
864dbfa3 2065Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2066{
502c6561 2067 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2068
2069 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2070
83bf042f 2071 if (obj) {
e1dccc0d 2072 av_fill(obj, SvIV(sv));
83bf042f 2073 } else {
a2a5de95
NC
2074 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2075 "Attempt to set length of freed array");
83bf042f
NC
2076 }
2077 return 0;
2078}
2079
2080int
83f29afa
VP
2081Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2082{
83f29afa
VP
2083 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2084 PERL_UNUSED_ARG(sv);
dc3bf405 2085 PERL_UNUSED_CONTEXT;
83f29afa
VP
2086
2087 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2088#if IVSIZE == I32SIZE
2089 *((IV *) &(mg->mg_len)) = 0;
2090#else
83f29afa
VP
2091 if (mg->mg_ptr)
2092 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2093#endif
83f29afa
VP
2094
2095 return 0;
2096}
2097
2098int
83bf042f
NC
2099Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2100{
7918f24d 2101 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2102 PERL_UNUSED_ARG(sv);
7918f24d 2103
94f3782b
DM
2104 /* during global destruction, mg_obj may already have been freed */
2105 if (PL_in_clean_all)
1ea47f64 2106 return 0;
94f3782b 2107
83bf042f
NC
2108 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2109
2110 if (mg) {
2111 /* arylen scalar holds a pointer back to the array, but doesn't own a
2112 reference. Hence the we (the array) are about to go away with it
2113 still pointing at us. Clear its pointer, else it would be pointing
2114 at free memory. See the comment in sv_magic about reference loops,
2115 and why it can't own a reference to us. */
2116 mg->mg_obj = 0;
2117 }
a0d0e21e
LW
2118 return 0;
2119}
2120
2121int
864dbfa3 2122Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2123{
16eb5365 2124 SV* const lsv = LvTARG(sv);
96c2a8ff 2125 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2126
2127 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2128 PERL_UNUSED_ARG(mg);
ac27b0f5 2129
6174b39a
FC
2130 if (found && found->mg_len != -1) {
2131 STRLEN i = found->mg_len;
25fdce4a 2132 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2133 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2134 sv_setuv(sv, i);
a0d0e21e 2135 return 0;
a0d0e21e 2136 }
35995e5c 2137 sv_setsv(sv,NULL);
a0d0e21e
LW
2138 return 0;
2139}
2140
2141int
864dbfa3 2142Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2143{
16eb5365 2144 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2145 SSize_t pos;
2146 STRLEN len;
c00206c8 2147 STRLEN ulen = 0;
53d44271 2148 MAGIC* found;
aec43834 2149 const char *s;
a0d0e21e 2150
7918f24d 2151 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2152 PERL_UNUSED_ARG(mg);
ac27b0f5 2153
96c2a8ff 2154 found = mg_find_mglob(lsv);
3881461a 2155 if (!found) {
a0d0e21e
LW
2156 if (!SvOK(sv))
2157 return 0;
96c2a8ff 2158 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2159 }
2160 else if (!SvOK(sv)) {
3881461a 2161 found->mg_len = -1;
a0d0e21e
LW
2162 return 0;
2163 }
aec43834 2164 s = SvPV_const(lsv, len);
a0d0e21e 2165
e1dccc0d 2166 pos = SvIV(sv);
a0ed51b3 2167
7e2040f0 2168 if (DO_UTF8(lsv)) {
aec43834 2169 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2170 if (ulen)
2171 len = ulen;
a0ed51b3
LW
2172 }
2173
a0d0e21e
LW
2174 if (pos < 0) {
2175 pos += len;
2176 if (pos < 0)
2177 pos = 0;
2178 }
eb160463 2179 else if (pos > (SSize_t)len)
a0d0e21e 2180 pos = len;
a0ed51b3 2181
3881461a 2182 found->mg_len = pos;
25fdce4a 2183 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2184
79072805
LW
2185 return 0;
2186}
2187
2188int
864dbfa3 2189Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2190{
2191 STRLEN len;
35a4481c 2192 SV * const lsv = LvTARG(sv);
b83604b4 2193 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2194 STRLEN offs = LvTARGOFF(sv);
2195 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2196 const bool negoff = LvFLAGS(sv) & 1;
2197 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2198
2199 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2200 PERL_UNUSED_ARG(mg);
6ff81951 2201
83f78d1a 2202 if (!translate_substr_offsets(
4ddea69a 2203 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2204 negoff ? -(IV)offs : (IV)offs, !negoff,
2205 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2206 )) {
2207 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2208 sv_setsv_nomg(sv, &PL_sv_undef);
2209 return 0;
2210 }
2211
9aa983d2 2212 if (SvUTF8(lsv))
4ddea69a 2213 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2214 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2215 if (SvUTF8(lsv))
2ef4b674 2216 SvUTF8_on(sv);
6ff81951
GS
2217 return 0;
2218}
2219
2220int
864dbfa3 2221Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2222{
83f78d1a 2223 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2224 const char * const tmps = SvPV_const(sv, len);
dd374669 2225 SV * const lsv = LvTARG(sv);
777f7c56
EB
2226 STRLEN lvoff = LvTARGOFF(sv);
2227 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2228 const bool negoff = LvFLAGS(sv) & 1;
2229 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2230
2231 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2232 PERL_UNUSED_ARG(mg);
075a4a2b 2233
a74fb2cd
FC
2234 SvGETMAGIC(lsv);
2235 if (SvROK(lsv))
2236 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2237 "Attempt to use reference as lvalue in substr"
2238 );
fc061ed8
FC
2239 SvPV_force_nomg(lsv,lsv_len);
2240 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2241 if (!translate_substr_offsets(
2242 lsv_len,
2243 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2244 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2245 ))
2246 Perl_croak(aTHX_ "substr outside of string");
2247 oldtarglen = lvlen;
1aa99e6b 2248 if (DO_UTF8(sv)) {
73a087f0 2249 sv_utf8_upgrade_nomg(lsv);
d931b1be 2250 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2251 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2252 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2253 SvUTF8_on(lsv);
2254 }
0d336106 2255 else if (SvUTF8(lsv)) {
5fcbf73d 2256 const char *utf8;
d931b1be 2257 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2258 newtarglen = len;
5fcbf73d 2259 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2260 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2261 Safefree(utf8);
1aa99e6b 2262 }
b76f3ce2 2263 else {
a74fb2cd 2264 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2265 newtarglen = len;
b76f3ce2 2266 }
83f78d1a
FC
2267 if (!neglen) LvTARGLEN(sv) = newtarglen;
2268 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2269
79072805
LW
2270 return 0;
2271}
2272
2273int
864dbfa3 2274Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2275{
7918f24d 2276 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2277 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2278#ifdef NO_TAINT_SUPPORT
2279 PERL_UNUSED_ARG(mg);
2280#endif
7918f24d 2281
64ff300b 2282 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2283 return 0;
2284}
2285
2286int
864dbfa3 2287Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2288{
7918f24d 2289 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2290 PERL_UNUSED_ARG(sv);
7918f24d 2291
b01e650a 2292 /* update taint status */
284167a5 2293 if (TAINT_get)
b01e650a
DM
2294 mg->mg_len |= 1;
2295 else
2296 mg->mg_len &= ~1;
463ee0b2
LW
2297 return 0;
2298}
2299
2300int
864dbfa3 2301Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2302{
35a4481c 2303 SV * const lsv = LvTARG(sv);
7918f24d
NC
2304
2305 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2306 PERL_UNUSED_ARG(mg);
6ff81951 2307
2e9e14dd 2308 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2309
6ff81951
GS
2310 return 0;
2311}
2312
2313int
864dbfa3 2314Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2315{
7918f24d 2316 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2317 PERL_UNUSED_ARG(mg);
79072805
LW
2318 do_vecset(sv); /* XXX slurp this routine */
2319 return 0;
2320}
2321
13733cde
FC
2322SV *
2323Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2324{
a0714e2c 2325 SV *targ = NULL;
13733cde
FC
2326 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2327 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2328 assert(mg);
5f05dabc 2329 if (LvTARGLEN(sv)) {
68dc0745 2330 if (mg->mg_obj) {
8772537c 2331 SV * const ahv = LvTARG(sv);
85fbaab2 2332 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2333 if (he)
2334 targ = HeVAL(he);
68dc0745 2335 }
bbfdc870 2336 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2337 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2338 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2339 {
2340 if (SvRMAGICAL(av)) {
2341 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2342 targ = svp ? *svp : NULL;
2343 }
2344 else
bbfdc870 2345 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2346 }
68dc0745 2347 }
46da273f 2348 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2349 /* somebody else defined it for us */
2350 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2351 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2352 LvTARGLEN(sv) = 0;
2353 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2354 mg->mg_obj = NULL;
68dc0745
PP
2355 mg->mg_flags &= ~MGf_REFCOUNTED;
2356 }
13733cde 2357 return targ;
5f05dabc 2358 }
71be2cbc 2359 else
13733cde
FC
2360 return LvTARG(sv);
2361}
2362
2363int
2364Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2365{
2366 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2367
2368 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2369 return 0;
2370}
2371
2372int
864dbfa3 2373Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2374{
7918f24d 2375 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2376 PERL_UNUSED_ARG(mg);
71be2cbc 2377 if (LvTARGLEN(sv))
68dc0745
PP
2378 vivify_defelem(sv);
2379 if (LvTARG(sv)) {
5f05dabc 2380 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2381 SvSETMAGIC(LvTARG(sv));
2382 }
5f05dabc
PP
2383 return 0;
2384}
2385
71be2cbc 2386void
864dbfa3 2387Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2388{
74e13ce4 2389 MAGIC *mg;
a0714e2c 2390 SV *value = NULL;
71be2cbc 2391
7918f24d
NC
2392 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2393
14befaf4 2394 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2395 return;
68dc0745 2396 if (mg->mg_obj) {
8772537c 2397 SV * const ahv = LvTARG(sv);
85fbaab2 2398 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2399 if (he)
2400 value = HeVAL(he);
3280af22 2401 if (!value || value == &PL_sv_undef)
be2597df 2402 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2403 }
bbfdc870
FC
2404 else if (LvSTARGOFF(sv) < 0)
2405 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2406 else {
502c6561 2407 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2408 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2409 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2410 else {
bbfdc870 2411 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2412 if (!svp || !(value = *svp))
bbfdc870 2413 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2414 }
2415 }
b37c2d43 2416 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2417 SvREFCNT_dec(LvTARG(sv));
2418 LvTARG(sv) = value;
71be2cbc 2419 LvTARGLEN(sv) = 0;
68dc0745 2420 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2421 mg->mg_obj = NULL;
68dc0745 2422 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2423}
2424
2425int
864dbfa3 2426Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2427{
7918f24d 2428 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2429 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2430 return 0;
810b8aa5
GS
2431}
2432
2433int
864dbfa3 2434Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2435{
7918f24d 2436 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2437 PERL_UNUSED_CONTEXT;
0177730e 2438 PERL_UNUSED_ARG(sv);
565764a8 2439 mg->mg_len = -1;
93a17b20
LW
2440 return 0;
2441}
2442
2443int
864dbfa3 2444Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2445{
35a4481c 2446 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2447
7918f24d
NC
2448 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2449
79072805 2450 if (uf && uf->uf_set)
24f81a43 2451 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2452 return 0;
2453}
2454
c277df42 2455int
faf82a0b
AE
2456Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2457{
488344d2 2458 const char type = mg->mg_type;
7918f24d
NC
2459
2460 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2461
488344d2
NC
2462 if (type == PERL_MAGIC_qr) {
2463 } else if (type == PERL_MAGIC_bm) {
2464 SvTAIL_off(sv);
2465 SvVALID_off(sv);
2466 } else {
2467 assert(type == PERL_MAGIC_fm);
488344d2
NC
2468 }
2469 return sv_unmagic(sv, type);
faf82a0b
AE
2470}
2471
7a4c00b4 2472#ifdef USE_LOCALE_COLLATE
79072805 2473int
864dbfa3 2474Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2475{
7918f24d
NC
2476 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2477
bbce6d69 2478 /*
838b5b74 2479 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2480 * and vanished with a faint plop.
2481 */
96a5add6 2482 PERL_UNUSED_CONTEXT;
8772537c 2483 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2484 if (mg->mg_ptr) {
2485 Safefree(mg->mg_ptr);
2486 mg->mg_ptr = NULL;
565764a8 2487 mg->mg_len = -1;
7a4c00b4 2488 }
bbce6d69
PP
2489 return 0;
2490}
7a4c00b4 2491#endif /* USE_LOCALE_COLLATE */
bbce6d69 2492
7e8c5dac
HS
2493/* Just clear the UTF-8 cache data. */
2494int
2495Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2496{
7918f24d 2497 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2498 PERL_UNUSED_CONTEXT;
8772537c 2499 PERL_UNUSED_ARG(sv);
7e8c5dac 2500 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2501 mg->mg_ptr = NULL;
7e8c5dac
HS
2502 mg->mg_len = -1; /* The mg_len holds the len cache. */
2503 return 0;
2504}
2505
bbce6d69 2506int
9cce4f9a
FC
2507Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2508{
9782ce69 2509 const char *bad = NULL;
9cce4f9a 2510 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2511 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2512 switch (mg->mg_private & OPpLVREF_TYPE) {
2513 case OPpLVREF_SV:
2514 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2515 bad = " SCALAR";
2516 break;
2517 case OPpLVREF_AV:
2518 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2519 bad = "n ARRAY";
2520 break;
2521 case OPpLVREF_HV:
2522 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2523 bad = " HASH";
2524 break;
2525 case OPpLVREF_CV:
2526 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2527 bad = " CODE";
2528 }
2529 if (bad)
26a50d99 2530 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2531 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2532 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2533 case 0:
2534 {
2535 SV * const old = PAD_SV(mg->mg_len);
2536 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2537 SvREFCNT_dec(old);
2538 break;
2539 }
2540 case SVt_PVGV:
2541 gv_setref(mg->mg_obj, sv);
2542 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2543 break;
2544 case SVt_PVAV:
2545 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2546 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2547 break;
2548 case SVt_PVHV:
7fcb36d5
JH
2549 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2550 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2551 }
d39c26a6
FC
2552 if (mg->mg_flags & MGf_PERSIST)
2553 NOOP; /* This sv is in use as an iterator var and will be reused,
2554 so we must leave the magic. */
2555 else
2556 /* This sv could be returned by the assignment op, so clear the
2557 magic, as lvrefs are an implementation detail that must not be
2558 leaked to the user. */
2559 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2560 return 0;
2561}
2562
2563int
864dbfa3 2564Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2565{
20b7effb 2566#ifdef USE_ITHREADS
97aff369 2567 dVAR;
20b7effb 2568#endif
eb578fdb
KW
2569 const char *s;
2570 I32 paren;
2571 const REGEXP * rx;
79072805 2572 I32 i;
8990e307 2573 STRLEN len;
125b9982 2574 MAGIC *tmg;
2fdbfb4d 2575
7918f24d
NC
2576 PERL_ARGS_ASSERT_MAGIC_SET;
2577
e91d8259 2578 if (!mg->mg_ptr) {
960b831f 2579 paren = mg->mg_len;
1e05feb3 2580 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2581 setparen_got_rx:
2fdbfb4d 2582 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2583 } else {
2fdbfb4d
AB
2584 /* Croak with a READONLY error when a numbered match var is
2585 * set without a previous pattern match. Unless it's C<local $1>
2586 */
e91d8259 2587 croakparen:
2fdbfb4d 2588 if (!PL_localizing) {
cb077ed2 2589 Perl_croak_no_modify();
2fdbfb4d
AB
2590 }
2591 }
e91d8259
NC
2592 return 0;
2593 }
2594
2595 switch (*mg->mg_ptr) {
748a9306 2596 case '\001': /* ^A */
f2da823f
FC
2597 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2598 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2599 FmLINES(PL_bodytarget) = 0;
2600 if (SvPOK(PL_bodytarget)) {
2601 char *s = SvPVX(PL_bodytarget);
2602 while ( ((s = strchr(s, '\n'))) ) {
2603 FmLINES(PL_bodytarget)++;
2604 s++;
2605 }
2606 }
125b9982 2607 /* mg_set() has temporarily made sv non-magical */
284167a5 2608 if (TAINTING_get) {
125b9982
NT
2609 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2610 SvTAINTED_on(PL_bodytarget);
2611 else
2612 SvTAINTED_off(PL_bodytarget);
2613 }
748a9306 2614 break;
49460fe6 2615 case '\003': /* ^C */
f2338a2e 2616 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2617 break;
2618
79072805 2619 case '\004': /* ^D */
b4ab917c 2620#ifdef DEBUGGING
b83604b4 2621 s = SvPV_nolen_const(sv);
ddcf8bc1 2622 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2623 if (DEBUG_x_TEST || DEBUG_B_TEST)
2624 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2625#else
38ab35f8 2626 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2627#endif
79072805 2628 break;
28f23441 2629 case '\005': /* ^E */
d0063567 2630 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2631#ifdef VMS
38ab35f8 2632 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2633#else
2634# ifdef WIN32
d0063567 2635 SetLastError( SvIV(sv) );
e37778c2
NC
2636# else
2637# ifdef OS2
38ab35f8 2638 os2_setsyserrno(SvIV(sv));
e37778c2 2639# else
d0063567 2640 /* will anyone ever use this? */
38ab35f8 2641 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2642# endif
2643# endif
22fae026 2644#endif
d0063567 2645 }
3e669301
KW
2646 else {
2647 unsigned int offset = 1;
2648 bool lex = FALSE;
2649
2650 /* It may be the shadow variable ${E_NCODING} which has lexical
2651 * scope. See comments at Perl__get_encoding in this file */
2652 if (*(mg->mg_ptr + 1) == '_') {
199670db
FC
2653 if (CopSTASH(PL_curcop) != get_hv("encoding::",0))
2654 Perl_croak_no_modify();
3e669301
KW
2655 lex = TRUE;
2656 offset++;
2657 }
2658 if (strEQ(mg->mg_ptr + offset, "NCODING")) {
2659 if (lex) { /* Use the shadow global */
2660 SvREFCNT_dec(PL_lex_encoding);
2661 if (SvOK(sv) || SvGMAGICAL(sv)) {
2662 PL_lex_encoding = newSVsv(sv);
2663 }
2664 else {
2665 PL_lex_encoding = NULL;
2666 }
2667 }
2668 else { /* Use the regular global */
050e2cbf
KW
2669 SvREFCNT_dec(PL_encoding);
2670 if (SvOK(sv) || SvGMAGICAL(sv)) {
d5b4785c
DIM
2671 if (PL_localizing != 2) {
2672 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2673 "Setting ${^ENCODING} is deprecated");
2674 }
050e2cbf
KW
2675 PL_encoding = newSVsv(sv);
2676 }
2677 else {
2678 PL_encoding = NULL;
2679 }
2680 }
3e669301
KW
2681 }
2682 }
d0063567 2683 break;
79072805 2684 case '\006': /* ^F */
38ab35f8 2685 PL_maxsysfd = SvIV(sv);
79072805 2686 break;
a0d0e21e 2687 case '\010': /* ^H */
38ab35f8 2688 PL_hints = SvIV(sv);
a0d0e21e 2689 break;
9d116dd7 2690 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2691 Safefree(PL_inplace);
bd61b366 2692 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2693 break;
d9bad346
FC
2694 case '\016': /* ^N */
2695 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2696 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2697 goto croakparen;
28f23441 2698 case '\017': /* ^O */
ac27b0f5 2699 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2700 Safefree(PL_osname);
bd61b366 2701 PL_osname = NULL;
3511154c
DM
2702 if (SvOK(sv)) {
2703 TAINT_PROPER("assigning to $^O");
2e0de35c 2704 PL_osname = savesvpv(sv);
3511154c 2705 }
ac27b0f5
NIS
2706 }
2707 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2708 STRLEN len;
2709 const char *const start = SvPV(sv, len);
b54fc2b6 2710 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2711 SV *tmp;
8b850bd5
NC
2712
2713
2714 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2715 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2716
2717 /* Opening for input is more common than opening for output, so
2718 ensure that hints for input are sooner on linked list. */
59cd0e26 2719 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2720 SvUTF8(sv))
2721 : newSVpvs_flags("", SvUTF8(sv));
2722 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2723 mg_set(tmp);
8b850bd5 2724
f747ebd6
Z
2725 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2726 SvUTF8(sv));
2727 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2728 mg_set(tmp);
ac27b0f5 2729 }
28f23441 2730 break;
79072805 2731 case '\020': /* ^P */
2fdbfb4d
AB
2732 PL_perldb = SvIV(sv);
2733 if (PL_perldb && !PL_DBsingle)
2734 init_debugger();
9b9e0be4 2735 break;
79072805 2736 case '\024': /* ^T */
88e89b8a 2737#ifdef BIG_TIME
6b88bc9c 2738 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2739#else
38ab35f8 2740 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2741#endif
79072805 2742 break;
e07ea26a
NC
2743 case '\025': /* ^UTF8CACHE */
2744 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2745 PL_utf8cache = (signed char) sv_2iv(sv);
2746 }
2747 break;
fde18df1 2748 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2749 if (*(mg->mg_ptr+1) == '\0') {
2750 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2751 i = SvIV(sv);
ac27b0f5 2752 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2753 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2754 }
599cee73 2755 }
0a378802 2756 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2757 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2758 if (!SvPOK(sv)) {
2759 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2760 break;
2761 }
f4fc7782 2762 {
b5477537 2763 STRLEN len, i;
d3a7d8c7 2764 int accumulate = 0 ;
f4fc7782 2765 int any_fatals = 0 ;
b83604b4 2766 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2767 for (i = 0 ; i < len ; ++i) {
2768 accumulate |= ptr[i] ;
2769 any_fatals |= (ptr[i] & 0xAA) ;
2770 }
4243c432
NC
2771 if (!accumulate) {
2772 if (!specialWARN(PL_compiling.cop_warnings))
2773 PerlMemShared_free(PL_compiling.cop_warnings);
2774 PL_compiling.cop_warnings = pWARN_NONE;
2775 }
3c3f8cd6
AB
2776 /* Yuck. I can't see how to abstract this: */
2777 else if (isWARN_on(
2778 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2779 WARN_ALL)
2780 && !any_fatals)
2781 {
2782 if (!specialWARN(PL_compiling.cop_warnings))
2783 PerlMemShared_free(PL_compiling.cop_warnings);
2784 PL_compiling.cop_warnings = pWARN_ALL;
2785 PL_dowarn |= G_WARN_ONCE ;
2786 }
d3a7d8c7 2787 else {
72dc9ed5
NC
2788 STRLEN len;
2789 const char *const p = SvPV_const(sv, len);
2790
2791 PL_compiling.cop_warnings
8ee4cf24 2792 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2793 p, len);
2794
d3a7d8c7
GS
2795 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2796 PL_dowarn |= G_WARN_ONCE ;
2797 }
f4fc7782 2798
d3a7d8c7 2799 }
4438c4b7 2800 }
971a9dd3 2801 }
79072805
LW
2802 break;
2803 case '.':
3280af22
NIS
2804 if (PL_localizing) {
2805 if (PL_localizing == 1)
7766f137 2806 SAVESPTR(PL_last_in_gv);
748a9306 2807 }
3280af22 2808 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2809 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2810 break;
2811 case '^':
acbe1b9d
FC
2812 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2813 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2814 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2815 break;
2816 case '~':
acbe1b9d
FC
2817 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2818 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2819 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2820 break;
2821 case '=':
acbe1b9d 2822 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2823 break;
2824 case '-':
acbe1b9d
FC
2825 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2826 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2827 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2828 break;
2829 case '%':
acbe1b9d 2830 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2831 break;
2832 case '|':
4b65379b 2833 {
099be4f1 2834 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2835 if(!io)
2836 break;
38ab35f8 2837 if ((SvIV(sv)) == 0)
4b65379b
CS
2838 IoFLAGS(io) &= ~IOf_FLUSH;
2839 else {
2840 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2841 PerlIO *ofp = IoOFP(io);
2842 if (ofp)
2843 (void)PerlIO_flush(ofp);
2844 IoFLAGS(io) |= IOf_FLUSH;
2845 }
2846 }
79072805
LW
2847 }
2848 break;
79072805 2849 case '/':
1ab48e3a
YO
2850 {
2851 SV *tmpsv= sv;
2852 if (SvROK(sv)) {
2853 SV *referent= SvRV(sv);
2854 const char *reftype= sv_reftype(referent, 0);
2855 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2856 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2857 * a full string comparison on the return of sv_reftype() both of which
2858 * make me feel worse! NOTE, do not modify this comment without reviewing the
2859 * corresponding comment in sv_reftype(). - Yves */
2860 if (reftype[0] == 'S' || reftype[0] == 'L') {
2861 IV val= SvIV(referent);
2862 if (val <= 0) {
2863 tmpsv= &PL_sv_undef;
ddc3d23f 2864 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1ab48e3a
YO
2865 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2866 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2867 );
2868 }
2869 } else {
ddce084a 2870 sv_setsv(sv, PL_rs);
ee0ba734 2871 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
2872 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2873 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
2874 }
2875 }
b3a2acfa 2876 SvREFCNT_dec(PL_rs);
1ab48e3a 2877 PL_rs = newSVsv(tmpsv);
b3a2acfa 2878 }
79072805
LW
2879 break;
2880 case '\\':
ef8d46e8 2881 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2882 if (SvOK(sv)) {
7889fe52 2883 PL_ors_sv = newSVsv(sv);
009c130f 2884 }
e3c19b7b 2885 else {
a0714e2c 2886 PL_ors_sv = NULL;
e3c19b7b 2887 }
79072805 2888 break;
7d69d4a6
FC
2889 case '[':
2890 if (SvIV(sv) != 0)
2891 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2892 break;
79072805 2893 case '?':
ff0cee69 2894#ifdef COMPLEX_STATUS
6b88bc9c 2895 if (PL_localizing == 2) {
41cb7b2b 2896 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2897 PL_statusvalue = LvTARGOFF(sv);
2898 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2899 }
2900 else
2901#endif
2902#ifdef VMSISH_STATUS
2903 if (VMSISH_STATUS)
fb38d079 2904 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2905 else
2906#endif
38ab35f8 2907 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2908 break;
2909 case '!':
93189314
JH
2910 {
2911#ifdef VMS
2912# define PERL_VMS_BANG vaxc$errno
2913#else
2914# define PERL_VMS_BANG 0
2915#endif
27329181 2916#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2917 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2918 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2919#else
91487cfc 2920 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2921 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2922#endif
93189314 2923 }
79072805
LW
2924 break;
2925 case '<':
985213f2 2926 {
b469f1e0 2927 /* XXX $< currently silently ignores failures */
dfff4baf 2928 const Uid_t new_uid = SvUID(sv);
985213f2 2929 PL_delaymagic_uid = new_uid;
3280af22
NIS
2930 if (PL_delaymagic) {
2931 PL_delaymagic |= DM_RUID;
79072805
LW
2932 break; /* don't do magic till later */
2933 }
2934#ifdef HAS_SETRUID
b469f1e0 2935 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW
2936#else
2937#ifdef HAS_SETREUID
b469f1e0 2938 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 2939#else
85e6fe83 2940#ifdef HAS_SETRESUID
b469f1e0 2941 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 2942#else
985213f2 2943 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2944#ifdef PERL_DARWIN
2945 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2946 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 2947 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 2948#endif
b469f1e0 2949 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 2950 } else {
cea2e8a9 2951 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2952 }
79072805
LW
2953#endif
2954#endif
85e6fe83 2955#endif
79072805 2956 break;
985213f2 2957 }
79072805 2958 case '>':
985213f2 2959 {
b469f1e0 2960 /* XXX $> currently silently ignores failures */
dfff4baf 2961 const Uid_t new_euid = SvUID(sv);
985213f2 2962 PL_delaymagic_euid = new_euid;
3280af22
NIS
2963 if (PL_delaymagic) {
2964 PL_delaymagic |= DM_EUID;
79072805
LW
2965 break; /* don't do magic till later */
2966 }
2967#ifdef HAS_SETEUID
b469f1e0 2968 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW
2969#else
2970#ifdef HAS_SETREUID
b469f1e0 2971 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW
2972#else
2973#ifdef HAS_SETRESUID
b469f1e0 2974 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 2975#else
985213f2 2976 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 2977 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 2978 else {
cea2e8a9 2979 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2980 }
79072805
LW
2981#endif
2982#endif
85e6fe83 2983#endif
79072805 2984 break;
985213f2 2985 }
79072805 2986 case '(':
985213f2 2987 {
b469f1e0 2988 /* XXX $( currently silently ignores failures */
dfff4baf 2989 const Gid_t new_gid = SvGID(sv);
985213f2 2990 PL_delaymagic_gid = new_gid;
3280af22
NIS
2991 if (PL_delaymagic) {
2992 PL_delaymagic |= DM_RGID;
79072805
LW
2993 break; /* don't do magic till later */
2994 }
2995#ifdef HAS_SETRGID
b469f1e0 2996 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW
2997#else
2998#ifdef HAS_SETREGID
b469f1e0 2999 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW
3000#else
3001#ifdef HAS_SETRESGID
b469f1e0 3002 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3003#else
985213f2 3004 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3005 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3006 else {
cea2e8a9 3007 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3008 }
79072805
LW
3009#endif
3010#endif
85e6fe83 3011#endif
79072805 3012 break;
985213f2 3013 }
79072805 3014 case ')':
985213f2 3015 {
b469f1e0 3016 /* XXX $) currently silently ignores failures */
dfff4baf 3017 Gid_t new_egid;
5cd24f17
PP
3018#ifdef HAS_SETGROUPS
3019 {
b83604b4 3020 const char *p = SvPV_const(sv, len);
757f63d8 3021 Groups_t *gary = NULL;
fdadaf77 3022 const char* endptr;
22ff3130 3023 UV uv;
fb4089e0 3024#ifdef _SC_NGROUPS_MAX
3025 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3026
3027 if (maxgrp < 0)
3028 maxgrp = NGROUPS;
3029#else
3030 int maxgrp = NGROUPS;
3031#endif
757f63d8
SP
3032
3033 while (isSPACE(*p))
3034 ++p;
22ff3130
HS
3035 if (grok_atoUV(p, &uv, &endptr))
3036 new_egid = (Gid_t)uv;
3037 else {
3038 new_egid = 0; /* XXX is this safe? */
3039 endptr = NULL;
3040 }
fb4089e0 3041 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3042 if (endptr == NULL)
3043 break;
3044 p = endptr;
757f63d8
SP
3045 while (isSPACE(*p))
3046 ++p;
3047 if (!*p)
3048 break;
fdadaf77 3049 if (!gary)
757f63d8
SP
3050 Newx(gary, i + 1, Groups_t);
3051 else
3052 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3053 if (grok_atoUV(p, &uv, &endptr))
3054 gary[i] = (Groups_t)uv;
3055 else {
3056 gary[i] = 0; /* XXX is this safe? */
3057 endptr = NULL;
3058 }
757f63d8
SP
3059 }
3060 if (i)
b469f1e0 3061 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3062 Safefree(gary);
5cd24f17
PP
3063 }
3064#else /* HAS_SETGROUPS */
dfff4baf 3065 new_egid = SvGID(sv);
5cd24f17 3066#endif /* HAS_SETGROUPS */
985213f2 3067 PL_delaymagic_egid = new_egid;
3280af22
NIS
3068 if (PL_delaymagic) {
3069 PL_delaymagic |= DM_EGID;
79072805
LW
3070 break; /* don't do magic till later */
3071 }
3072#ifdef HAS_SETEGID
b469f1e0 3073 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW
3074#else
3075#ifdef HAS_SETREGID
b469f1e0 3076 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW
3077#else
3078#ifdef HAS_SETRESGID
b469f1e0 3079 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3080#else
985213f2 3081 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3082 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3083 else {
cea2e8a9 3084 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3085 }
79072805
LW
3086#endif
3087#endif
85e6fe83 3088#endif
79072805 3089 break;
985213f2 3090 }
79072805 3091 case ':':
2d8e6c8d 3092 PL_chopset = SvPV_force(sv,len);
79072805 3093 break;
9cdac2a2
FC
3094 case '$': /* $$ */
3095 /* Store the pid in mg->mg_obj so we can tell when a fork has
3096 occurred. mg->mg_obj points to *$ by default, so clear it. */
3097 if (isGV(mg->mg_obj)) {
3098 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3099 SvREFCNT_dec(mg->mg_obj);
3100 mg->mg_flags |= MGf_REFCOUNTED;
3101 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3102 }
3103 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3104 break;
79072805 3105 case '0':
e2975953 3106 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
3107#ifdef HAS_SETPROCTITLE
3108 /* The BSDs don't show the argv[] in ps(1) output, they
3109 * show a string from the process struct and provide
3110 * the setproctitle() routine to manipulate that. */
a2722ac9 3111 if (PL_origalen != 1) {
b83604b4 3112 s = SvPV_const(sv, len);
98b76f99 3113# if __FreeBSD_version > 410001
9aad2c0e 3114 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
3115 * but not the "(perl) suffix from the ps(1)
3116 * output, because that's what ps(1) shows if the
3117 * argv[] is modified. */
6f2ad931 3118 setproctitle("-%s", s);
9aad2c0e 3119# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
3120 /* This doesn't really work if you assume that
3121 * $0 = 'foobar'; will wipe out 'perl' from the $0
3122 * because in ps(1) output the result will be like
3123 * sprintf("perl: %s (perl)", s)
3124 * I guess this is a security feature:
3125 * one (a user process) cannot get rid of the original name.
3126 * --jhi */
3127 setproctitle("%s", s);
3128# endif
3129 }
9d3968b2 3130#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 3131 if (PL_origalen != 1) {
17aa7f3d 3132 union pstun un;
b83604b4 3133 s = SvPV_const(sv, len);
6867be6d 3134 un.pst_command = (char *)s;
17aa7f3d
JH
3135 pstat(PSTAT_SETCMD, un, len, 0, 0);
3136 }
9d3968b2 3137#else
2d2af554
GA
3138 if (PL_origalen > 1) {
3139 /* PL_origalen is set in perl_parse(). */
3140 s = SvPV_force(sv,len);
3141 if (len >= (STRLEN)PL_origalen-1) {
3142 /* Longer than original, will be truncated. We assume that
3143 * PL_origalen bytes are available. */
3144 Copy(s, PL_origargv[0], PL_origalen-1, char);
3145 }
3146 else {
3147 /* Shorter than original, will be padded. */
235ac35d 3148#ifdef PERL_DARWIN
60777a0d
JH
3149 /* Special case for Mac OS X: see [perl #38868] */
3150 const int pad = 0;
235ac35d 3151#else
8a89a4f1
MB
3152 /* Is the space counterintuitive? Yes.
3153 * (You were expecting \0?)
3154 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3155 * --jhi */
60777a0d 3156 const int pad = ' ';
235ac35d 3157#endif
60777a0d
JH
3158 Copy(s, PL_origargv[0], len, char);
3159 PL_origargv[0][len] = 0;
3160 memset(PL_origargv[0] + len + 1,
3161 pad, PL_origalen - len - 1);
2d2af554
GA
3162 }
3163 PL_origargv[0][PL_origalen-1] = 0;
3164 for (i = 1; i < PL_origargc; i++)
3165 PL_origargv[i] = 0;
7636ea95
AB
3166#ifdef HAS_PRCTL_SET_NAME
3167 /* Set the legacy process name in addition to the POSIX name on Linux */
3168 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3169 /* diag_listed_as: SKIPME */
3170 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3171 }
3172#endif
79072805 3173 }
9d3968b2 3174#endif
e2975953 3175 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3176 break;
3177 }
3178 return 0;
3179}
3180
3181I32
84c7b88c
BF
3182Perl_whichsig_sv(pTHX_ SV *sigsv)
3183{
3184 const char *sigpv;
3185 STRLEN siglen;
3186 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3187 sigpv = SvPV_const(sigsv, siglen);
3188 return whichsig_pvn(sigpv, siglen);
3189}
3190
3191I32
3192Perl_whichsig_pv(pTHX_ const char *sig)
3193{
3194 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3195 return whichsig_pvn(sig, strlen(sig));
3196}
3197
3198I32
3199Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3200{
eb578fdb 3201 char* const* sigv;
7918f24d 3202
84c7b88c 3203 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3204 PERL_UNUSED_CONTEXT;
79072805 3205
aadb217d 3206 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3207 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3208 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3209#ifdef SIGCLD
84c7b88c 3210 if (memEQs(sig, len, "CHLD"))
79072805
LW
3211 return SIGCLD;
3212#endif
3213#ifdef SIGCHLD
84c7b88c 3214 if (memEQs(sig, len, "CLD"))
79072805
LW
3215 return SIGCHLD;
3216#endif
7f1236c0 3217 return -1;
79072805
LW
3218}
3219
ecfc5424 3220Signal_t
1e82f5a6 3221#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3222Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3223#else
3224Perl_sighandler(int sig)
3225#endif
79072805 3226{
1018e26f
NIS
3227#ifdef PERL_GET_SIG_CONTEXT
3228 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3229#else
cea2e8a9 3230 dTHX;
71d280e3 3231#endif
79072805 3232 dSP;
a0714e2c
SS
3233 GV *gv = NULL;
3234 SV *sv = NULL;
8772537c 3235 SV * const tSv = PL_Sv;
601f1833 3236 CV *cv = NULL;
533c011a 3237 OP *myop = PL_op;
84902520 3238 U32 flags = 0;
8772537c 3239 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3240 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3241 SV *errsv_save = NULL;
71d280e3 3242
84902520 3243
727405f8 3244 if (!PL_psig_ptr[sig]) {
99ef548b 3245 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3246 PL_sig_name[sig]);
3247 exit(sig);
3248 }
ff0cee69 3249
a0d63a7b
DM
3250 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3251 /* Max number of items pushed there is 3*n or 4. We cannot fix
3252 infinity, so we fix 4 (in fact 5): */
3253 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3254 flags |= 1;
3255 PL_savestack_ix += 5; /* Protect save in progress. */
3256 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3257 }
84902520 3258 }
84902520 3259 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3260 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3261 || SvTYPE(cv) != SVt_PVCV) {
3262 HV *st;
f2c0649b 3263 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3264 }
84902520 3265
a0d0e21e 3266 if (!cv || !CvROOT(cv)) {
07c325bb 3267 const HEK * const hek = gv
1d6bb9ae
FC
3268 ? GvENAME_HEK(gv)
3269 : cv && CvNAMED(cv)
3270 ? CvNAME_HEK(cv)
07c325bb
FC
3271 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3272 if (hek)
3273 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3274 "SIG%s handler \"%"HEKf"\" not defined.\n",
3275 PL_sig_name[sig], hek);
3276 /* diag_listed_as: SIG%s handler "%s" not defined */
3277 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3278 "SIG%s handler \"__ANON__\" not defined.\n",
3279 PL_sig_name[sig]);
00d579c5 3280 goto cleanup;
79072805
LW
3281 }
3282
0c4d3b5e
DM
3283 sv = PL_psig_name[sig]
3284 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3285 : newSVpv(PL_sig_name[sig],0);
72048cfe 3286 flags |= 8;
0c4d3b5e
DM
3287 SAVEFREESV(sv);
3288
a0d63a7b
DM
3289 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3290 /* make sure our assumption about the size of the SAVEs are correct:
3291 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3292 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3293 }
e336de0d 3294
e788e7d3 3295 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3296 PUSHMARK(SP);
79072805 3297 PUSHs(sv);
8aad04aa
JH
3298#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3299 {
3300 struct sigaction oact;
3301
3302 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3303 if (sip) {
3304 HV *sih = newHV();
ad64d0ec 3305 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3306 /* The siginfo fields signo, code, errno, pid, uid,
3307 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3308 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3309 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3310#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
3311 hv_stores(sih, "errno", newSViv(sip->si_errno));
3312 hv_stores(sih, "status", newSViv(sip->si_status));
3313 hv_stores(sih, "uid", newSViv(sip->si_uid));
3314 hv_stores(sih, "pid", newSViv(sip->si_pid));
3315 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3316 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3317#endif
8aad04aa 3318 EXTEND(SP, 2);
ad64d0ec 3319 PUSHs(rv);
22f1178f 3320 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3321 }
b4552a27 3322
8aad04aa
JH
3323 }
3324 }
3325#endif
79072805 3326 PUTBACK;
a0d0e21e 3327
100c03aa
JL
3328 errsv_save = newSVsv(ERRSV);
3329
ad64d0ec 3330 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3331
d3acc0f7 3332 POPSTACK;
eed484f9
DD
3333 {
3334 SV * const errsv = ERRSV;
3335 if (SvTRUE_NN(errsv)) {
3336 SvREFCNT_dec(errsv_save);
c22d665b 3337#ifndef PERL_MICRO
1b266415
NIS
3338 /* Handler "died", for example to get out of a restart-able read().
3339 * Before we re-do that on its behalf re-enable the signal which was
3340 * blocked by the system when we entered.
3341 */
c22d665b 3342#ifdef HAS_SIGPROCMASK
d488af49 3343#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3344 if (sip || uap)
c22d665b 3345#endif
eed484f9
DD
3346 {
3347 sigset_t set;
3348 sigemptyset(&set);
3349 sigaddset(&set,sig);
3350 sigprocmask(SIG_UNBLOCK, &set, NULL);
3351 }
c22d665b 3352#else
eed484f9
DD
3353 /* Not clear if this will work */
3354 (void)rsignal(sig, SIG_IGN);
3355 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3356#endif
3357#endif /* !PERL_MICRO */
eed484f9
DD
3358 die_sv(errsv);
3359 }
3360 else {
3361 sv_setsv(errsv, errsv_save);
3362 SvREFCNT_dec(errsv_save);
3363 }
100c03aa
JL
3364 }
3365
7b52d656 3366 cleanup:
0c4d3b5e
DM
3367 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3368 PL_savestack_ix = old_ss_ix;
72048cfe 3369 if (flags & 8)
2357bae7 3370 SvREFCNT_dec_NN(sv);
533c011a 3371 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3372
3280af22
NIS
3373 PL_Sv = tSv; /* Restore global temporaries. */
3374 PL_Xpv = tXpv;
53bb94e2 3375 return;
79072805 3376}
4e35701f
NIS
3377
3378
51371543 3379static void
8772537c 3380S_restore_magic(pTHX_ const void *p)
51371543 3381{
8772537c
AL
3382 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3383 SV* const sv = mgs->mgs_sv;
150b625d 3384 bool bumped;
51371543
GS
3385
3386 if (!sv)
3387 return;
3388
4bac9ae4
CS
3389 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3390 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3391#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
3392 /* While magic was saved (and off) sv_setsv may well have seen
3393 this SV as a prime candidate for COW. */
3394 if (SvIsCOW(sv))
e424a81e 3395 sv_force_normal_flags(sv, 0);
f9701176 3396#endif
a623f893
FC
3397 if (mgs->mgs_flags)
3398 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS
3399 else
3400 mg_magical(sv);
51371543
GS
3401 }
3402
150b625d 3403 bumped = mgs->mgs_bumped;
51371543
GS
3404 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3405
3406 /* If we're still on top of the stack, pop us off. (That condition
3407 * will be satisfied if restore_magic was called explicitly, but *not*
3408 * if it's being called via leave_scope.)
3409 * The reason for doing this is that otherwise, things like sv_2cv()
3410 * may leave alloc gunk on the savestack, and some code
3411 * (e.g. sighandler) doesn't expect that...
3412 */
3413 if (PL_savestack_ix == mgs->mgs_ss_ix)
3414 {
1be36ce0
NC
3415 UV popval = SSPOPUV;
3416 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3417 PL_savestack_ix -= 2;
1be36ce0
NC
3418 popval = SSPOPUV;
3419 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3420 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3421 }
150b625d
DM
3422 if (bumped) {
3423 if (SvREFCNT(sv) == 1) {
3424 /* We hold the last reference to this SV, which implies that the
3425 SV was deleted as a side effect of the routines we called.
3426 So artificially keep it alive a bit longer.
3427 We avoid turning on the TEMP flag, which can cause the SV's
3428 buffer to get stolen (and maybe other stuff). */
150b625d 3429 sv_2mortal(sv);
4bac9ae4 3430 SvTEMP_off(sv);
8985fe98 3431 }
150b625d 3432 else
2357bae7 3433 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3434 }
51371543
GS
3435}
3436
0c4d3b5e
DM
3437/* clean up the mess created by Perl_sighandler().
3438 * Note that this is only called during an exit in a signal handler;
3439 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3440 * skipped over. */
0c4d3b5e 3441
51371543 3442static void
8772537c 3443S_unwind_handler_stack(pTHX_ const void *p)
51371543 3444{
0c4d3b5e 3445 PERL_UNUSED_ARG(p);
7918f24d 3446
0c4d3b5e 3447 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3448}
1018e26f 3449
66610fdd 3450/*
b3ca2e83
NC
3451=for apidoc magic_sethint
3452
3453Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3454C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3455anything that would need a deep copy. Maybe we should warn if we find a
3456reference.
b3ca2e83
NC
3457
3458=cut
3459*/
3460int
3461Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3462{
ad64d0ec 3463 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3464 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3465
7918f24d
NC
3466 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3467
e6e3e454
NC
3468 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3469 an alternative leaf in there, with PL_compiling.cop_hints being used if
3470 it's NULL. If needed for threads, the alternative could lock a mutex,
3471 or take other more complex action. */
3472
5b9c0671
NC
3473 /* Something changed in %^H, so it will need to be restored on scope exit.
3474 Doing this here saves a lot of doing it manually in perl code (and
3475 forgetting to do it, and consequent subtle errors. */
3476 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3477 CopHINTHASH_set(&PL_compiling,
3478 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3479 return 0;
3480}
3481
3482/*
f175cff5 3483=for apidoc magic_clearhint