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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
fbe13c60 130Turns on the magical status of an SV. See C<L</sv_magic>>.
954c1994
GS
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
796b6530 163be >= C<SVt_PVMG>. See C<L</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;
b949b68f 174 bool taint_only = TRUE; /* the only get method seen is taint */
ff76feab 175 MAGIC *newmg, *head, *cur, *mg;
6683b158 176
7918f24d
NC
177 PERL_ARGS_ASSERT_MG_GET;
178
407287f9
FC
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
180
ff76feab
AMS
181 /* We must call svt_get(sv, mg) for each valid entry in the linked
182 list of magic. svt_get() may delete the current entry, add new
183 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184
185 newmg = cur = head = mg = SvMAGIC(sv);
186 while (mg) {
35a4481c 187 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 189
2b260de0 190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
191
192 /* taint's mg get is so dumb it doesn't need flag saving */
b949b68f
DM
193 if (mg->mg_type != PERL_MAGIC_taint) {
194 taint_only = FALSE;
195 if (!saved) {
196 save_magic(mgs_ix, sv);
197 saved = TRUE;
198 }
199 }
a9844598 200
16c91539 201 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 202
58f82c5c
DM
203 /* guard against magic having been deleted - eg FETCH calling
204 * untie */
f9c6fee5 205 if (!SvMAGIC(sv)) {
a623f893
FC
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 208 break;
f9c6fee5 209 }
b77f7d40 210
f9c6fee5 211 /* recalculate flags if this entry was deleted. */
ff76feab 212 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 215 }
7d1328bb 216 else if (vtbl == &PL_vtbl_utf8) {
b949b68f
DM
217 /* get-magic can reallocate the PV, unless there's only taint
218 * magic */
219 if (taint_only) {
220 MAGIC *mg2;
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
224 && mg2->mg_virtual
225 && mg2->mg_virtual->svt_get
226 ) {
227 taint_only = FALSE;
228 break;
229 }
230 }
231 }
232 if (!taint_only)
233 magic_setutf8(sv, mg);
7d1328bb 234 }
ff76feab 235
f9c6fee5 236 mg = nextmg;
ff76feab 237
0723351e 238 if (have_new) {
ff76feab
AMS
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
241 if (mg == head) {
0723351e 242 have_new = 0;
ff76feab
AMS
243 mg = cur;
244 head = newmg;
245 }
246 }
247
248 /* Were any new entries added? */
0723351e
NC
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
250 have_new = 1;
ff76feab
AMS
251 cur = mg;
252 mg = newmg;
a623f893
FC
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 255 }
79072805 256 }
463ee0b2 257
a9844598
CS
258 if (saved)
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
260
79072805
LW
261 return 0;
262}
263
954c1994
GS
264/*
265=for apidoc mg_set
266
fbe13c60 267Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
268
269=cut
270*/
271
79072805 272int
864dbfa3 273Perl_mg_set(pTHX_ SV *sv)
79072805 274{
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
b5ed8c44
FC
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
282
ff44333e 283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
284
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 286 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 287 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 291 }
e0a73de4 292 if (PL_localizing == 2
b5ed8c44 293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 294 continue;
2b260de0 295 if (vtbl && vtbl->svt_set)
16c91539 296 vtbl->svt_set(aTHX_ sv, mg);
79072805 297 }
463ee0b2 298
8772537c 299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
300 return 0;
301}
302
954c1994
GS
303/*
304=for apidoc mg_length
305
d4e99c76 306Reports on the SV's length in bytes, calling length magic if available,
796b6530 307but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 308magic if there is no 'length' magic, but with no indication as to
796b6530
KW
309whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310higher. Use C<sv_len()> instead.
954c1994
GS
311
312=cut
313*/
314
79072805 315U32
864dbfa3 316Perl_mg_length(pTHX_ SV *sv)
79072805
LW
317{
318 MAGIC* mg;
463ee0b2 319 STRLEN len;
463ee0b2 320
7918f24d
NC
321 PERL_ARGS_ASSERT_MG_LENGTH;
322
79072805 323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 324 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 325 if (vtbl && vtbl->svt_len) {
35a4481c 326 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 327 save_magic(mgs_ix, sv);
a0d0e21e 328 /* omit MGf_GSKIP -- not changed here */
16c91539 329 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
331 return len;
332 }
333 }
334
bd8446cf 335 (void)SvPV_const(sv, len);
463ee0b2 336 return len;
79072805
LW
337}
338
8fb26106 339I32
864dbfa3 340Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
341{
342 MAGIC* mg;
ac27b0f5 343
7918f24d
NC
344 PERL_ARGS_ASSERT_MG_SIZE;
345
93965878 346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 347 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 348 if (vtbl && vtbl->svt_len) {
35a4481c
AL
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
350 I32 len;
455ece5e 351 save_magic(mgs_ix, sv);
93965878 352 /* omit MGf_GSKIP -- not changed here */
16c91539 353 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
355 return len;
356 }
357 }
358
359 switch(SvTYPE(sv)) {
360 case SVt_PVAV:
502c6561 361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
362 case SVt_PVHV:
363 /* FIXME */
364 default:
cea2e8a9 365 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 366
93965878 367 }
a25b5927 368 NOT_REACHED; /* NOTREACHED */
93965878
NIS
369}
370
954c1994
GS
371/*
372=for apidoc mg_clear
373
fbe13c60 374Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
375
376=cut
377*/
378
79072805 379int
864dbfa3 380Perl_mg_clear(pTHX_ SV *sv)
79072805 381{
35a4481c 382 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 383 MAGIC* mg;
8ac77ac9 384 MAGIC *nextmg;
463ee0b2 385
7918f24d
NC
386 PERL_ARGS_ASSERT_MG_CLEAR;
387
455ece5e 388 save_magic(mgs_ix, sv);
463ee0b2 389
8ac77ac9 390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 391 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 392 /* omit GSKIP -- never set here */
727405f8 393
8ac77ac9
NC
394 nextmg = mg->mg_moremagic; /* it may delete itself */
395
2b260de0 396 if (vtbl && vtbl->svt_clear)
16c91539 397 vtbl->svt_clear(aTHX_ sv, mg);
79072805 398 }
463ee0b2 399
8772537c 400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
401 return 0;
402}
403
ed624ca8 404static MAGIC*
ddeaf645 405S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 406{
39de7f53
FR
407 assert(flags <= 1);
408
409 if (sv) {
410 MAGIC *mg;
411
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
414 return mg;
415 }
416 }
417 }
418
419 return NULL;
420}
421
954c1994
GS
422/*
423=for apidoc mg_find
424
796b6530 425Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
426
427=cut
428*/
429
93a17b20 430MAGIC*
ddeaf645 431Perl_mg_find(const SV *sv, int type)
93a17b20 432{
ddeaf645 433 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
434}
435
436/*
437=for apidoc mg_findext
438
439Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 440C<L</sv_magicext>>.
39de7f53
FR
441
442=cut
443*/
444
445MAGIC*
ddeaf645 446Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 447{
ddeaf645 448 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
449}
450
96c2a8ff
FC
451MAGIC *
452Perl_mg_find_mglob(pTHX_ SV *sv)
453{
454 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
455 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
456 /* This sv is only a delegate. //g magic must be attached to
457 its target. */
458 vivify_defelem(sv);
459 sv = LvTARG(sv);
460 }
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
463 return NULL;
464}
465
954c1994
GS
466/*
467=for apidoc mg_copy
468
fbe13c60 469Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
470
471=cut
472*/
473
79072805 474int
864dbfa3 475Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 476{
463ee0b2 477 int count = 0;
79072805 478 MAGIC* mg;
7918f24d
NC
479
480 PERL_ARGS_ASSERT_MG_COPY;
481
463ee0b2 482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 483 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 486 }
823a54a3
AL
487 else {
488 const char type = mg->mg_type;
1e73acc8 489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
490 sv_magic(nsv,
491 (type == PERL_MAGIC_tied)
492 ? SvTIED_obj(sv, mg)
27deb0cf 493 : mg->mg_obj,
823a54a3
AL
494 toLOWER(type), key, klen);
495 count++;
496 }
79072805 497 }
79072805 498 }
463ee0b2 499 return count;
79072805
LW
500}
501
954c1994 502/*
0cbee0a4
DM
503=for apidoc mg_localize
504
9711599e 505Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW
506SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507gets copied, value magic doesn't (I<e.g.>,
796b6530 508C<taint>, C<pos>).
9711599e 509
796b6530 510If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 511This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 512and that will handle the magic.
0cbee0a4
DM
513
514=cut
515*/
516
517void
af7df257 518Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
519{
520 MAGIC *mg;
7918f24d
NC
521
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
523
658a9f31
JD
524 if (nsv == DEFSV)
525 return;
526
0cbee0a4 527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 528 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 530 continue;
0cbee0a4 531
a5063e7c 532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 533 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 534 else
0cbee0a4
DM
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
a5063e7c 537
0cbee0a4 538 /* container types should remain read-only across localization */
9ff3e6d8 539 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
540 }
541
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 544 if (setmagic) {
9711599e
CS
545 PL_localizing = 1;
546 SvSETMAGIC(nsv);
547 PL_localizing = 0;
548 }
0cbee0a4
DM
549 }
550}
551
d9088386
Z
552#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
553static void
554S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
555{
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
559 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
564 }
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
567 Safefree(mg);
568}
569
0cbee0a4 570/*
954c1994
GS
571=for apidoc mg_free
572
fbe13c60 573Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
574
575=cut
576*/
577
79072805 578int
864dbfa3 579Perl_mg_free(pTHX_ SV *sv)
79072805
LW
580{
581 MAGIC* mg;
582 MAGIC* moremagic;
7918f24d
NC
583
584 PERL_ARGS_ASSERT_MG_FREE;
585
79072805 586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 587 moremagic = mg->mg_moremagic;
d9088386 588 mg_free_struct(sv, mg);
c826f41b 589 SvMAGIC_set(sv, moremagic);
79072805 590 }
b162af07 591 SvMAGIC_set(sv, NULL);
68f8932e 592 SvMAGICAL_off(sv);
79072805
LW
593 return 0;
594}
595
d9088386
Z
596/*
597=for apidoc Am|void|mg_free_type|SV *sv|int how
598
2d7f6611 599Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z
600
601=cut
602*/
603
604void
605Perl_mg_free_type(pTHX_ SV *sv, int how)
606{
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
d9088386
Z
610 moremg = mg->mg_moremagic;
611 if (mg->mg_type == how) {
19742f39 612 MAGIC *newhead;
d9088386
Z
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
615 if (prevmg) {
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
618 SvMAGIC_set(sv, mg);
619 }
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
623 mg = prevmg;
624 }
625 }
626 mg_magical(sv);
627}
628
e0d4aead
TC
629/*
630=for apidoc mg_freeext
631
632Remove any magic of type C<how> using virtual table C<vtbl> from the
633SV C<sv>. See L</sv_magic>.
634
635C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
636
637=cut
638*/
639
640void
641Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
642{
643 MAGIC *mg, *prevmg, *moremg;
644 PERL_ARGS_ASSERT_MG_FREEEXT;
645 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
646 MAGIC *newhead;
647 moremg = mg->mg_moremagic;
648 if (mg->mg_type == how && (vtbl == NULL || mg->mg_virtual == vtbl)) {
649 /* temporarily move to the head of the magic chain, in case
650 custom free code relies on this historical aspect of mg_free */
651 if (prevmg) {
652 prevmg->mg_moremagic = moremg;
653 mg->mg_moremagic = SvMAGIC(sv);
654 SvMAGIC_set(sv, mg);
655 }
656 newhead = mg->mg_moremagic;
657 mg_free_struct(sv, mg);
658 SvMAGIC_set(sv, newhead);
659 mg = prevmg;
660 }
661 }
662 mg_magical(sv);
663}
664
79072805 665#include <signal.h>
79072805 666
942e002e 667U32
864dbfa3 668Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 669{
8772537c 670 PERL_UNUSED_ARG(sv);
6cef1e77 671
7918f24d
NC
672 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
673
0bd48802 674 if (PL_curpm) {
27deb0cf 675 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 676 if (rx) {
fa531f32
DM
677 const SSize_t n = (SSize_t)mg->mg_obj;
678 if (n == '+') { /* @+ */
a678b0e4 679 /* return the number possible */
07bc277f 680 return RX_NPARENS(rx);
27deb0cf 681 } else { /* @- @^CAPTURE @{^CAPTURE} */
07bc277f 682 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
683
684 /* return the last filled */
f46c4081 685 while ( paren >= 0
07bc277f
NC
686 && (RX_OFFS(rx)[paren].start == -1
687 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 688 paren--;
fa531f32 689 if (n == '-') {
27deb0cf
YO
690 /* @- */
691 return (U32)paren;
692 } else {
693 /* @^CAPTURE @{^CAPTURE} */
694 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
695 }
696 }
0bd48802 697 }
8f580fb8 698 }
ac27b0f5 699
942e002e 700 return (U32)-1;
6cef1e77
IZ
701}
702
6502e081
DM
703/* @-, @+ */
704
6cef1e77 705int
864dbfa3 706Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 707{
7918f24d
NC
708 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
709
0bd48802 710 if (PL_curpm) {
27deb0cf 711 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 712 if (rx) {
fa531f32 713 const SSize_t n = (SSize_t)mg->mg_obj;
27deb0cf
YO
714 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
715 const I32 paren = mg->mg_len
fa531f32 716 + (n == '\003' ? 1 : 0);
a10eae29
FC
717 SSize_t s;
718 SSize_t t;
0bd48802
AL
719 if (paren < 0)
720 return 0;
07bc277f
NC
721 if (paren <= (I32)RX_NPARENS(rx) &&
722 (s = RX_OFFS(rx)[paren].start) != -1 &&
723 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 724 {
a10eae29 725 SSize_t i;
27deb0cf 726
fa531f32 727 if (n == '+') /* @+ */
0bd48802 728 i = t;
fa531f32 729 else if (n == '-') /* @- */
0bd48802 730 i = s;
27deb0cf
YO
731 else { /* @^CAPTURE @{^CAPTURE} */
732 CALLREG_NUMBUF_FETCH(rx,paren,sv);
733 return 0;
734 }
0bd48802 735
a10eae29 736 if (RX_MATCH_UTF8(rx)) {
07bc277f 737 const char * const b = RX_SUBBEG(rx);
0bd48802 738 if (b)
6502e081
DM
739 i = RX_SUBCOFFSET(rx) +
740 utf8_length((U8*)b,
741 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 742 }
727405f8 743
a10eae29 744 sv_setuv(sv, i);
232af1f8 745 return 0;
1aa99e6b 746 }
0bd48802 747 }
6cef1e77 748 }
3773545d 749 sv_set_undef(sv);
6cef1e77
IZ
750 return 0;
751}
752
6502e081
DM
753/* @-, @+ */
754
e4b89193 755int
a29d06ed
MG
756Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
757{
7918f24d 758 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 759 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
760 PERL_UNUSED_ARG(sv);
761 PERL_UNUSED_ARG(mg);
cb077ed2 762 Perl_croak_no_modify();
0dbb1585 763 NORETURN_FUNCTION_END;
a29d06ed
MG
764}
765
ad3296c6 766#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
767 if (SvPOK(sv)) { \
768 STRLEN len = SvCUR(sv); \
769 char * const p = SvPVX(sv); \
8e6b4db6
PC
770 while (len > 0 && isSPACE(p[len-1])) \
771 --len; \
772 SvCUR_set(sv, len); \
773 p[len] = '\0'; \
774 } \
ad3296c6
SH
775} STMT_END
776
8b850bd5
NC
777void
778Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
779{
7918f24d
NC
780 PERL_ARGS_ASSERT_EMULATE_COP_IO;
781
8b850bd5 782 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
e03e82a0 783 sv_set_undef(sv);
8b850bd5 784 else {
b2aed775 785 SvPVCLEAR(sv);
8b850bd5
NC
786 SvUTF8_off(sv);
787 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 788 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
789 assert(value);
790 sv_catsv(sv, value);
791 }
792 sv_catpvs(sv, "\0");
793 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 794 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
795 assert(value);
796 sv_catsv(sv, value);
797 }
798 }
799}
800
d9fe7d23
KW
801STATIC void
802S_fixup_errno_string(pTHX_ SV* sv)
803{
804 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
805 * Perl space. */
806
807 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
808
809 assert(SvOK(sv));
b35e4f8b
KW
810
811 if(strEQ(SvPVX(sv), "")) {
812 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
813 }
814 else {
d9fe7d23 815
d3c0b317
KW
816 /* In some locales the error string may come back as UTF-8, in which
817 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
818 * avoid as many possible backward compatibility issues as possible, we
819 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW
820 * an entirely invariant string. We assume that if the string looks
821 * like UTF-8, it really is UTF-8: "text in any other encoding that
822 * uses bytes with the high bit set is extremely unlikely to pass a
823 * UTF-8 validity test"
824 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
825 * potential that we will get it wrong however, especially on short
a8f4b0c6
KW
826 * error message text, so do an additional check. */
827 if ( ! IN_BYTES /* respect 'use bytes' */
c5f058df 828 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
a8f4b0c6
KW
829 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv))
830
831#ifdef USE_LOCALE_MESSAGES
832
833 && _is_cur_LC_category_utf8(LC_MESSAGES)
834
835#elif defined(USE_LOCLAE_CTYPE)
836
837 /* For systems that don't have a separate message category,
838 * this assumes that they follow the CTYPE one */
839 && _is_cur_LC_category_utf8(LC_CTYPE)
840
841#endif
842
843 ) {
d3c0b317
KW
844 SvUTF8_on(sv);
845 }
b35e4f8b 846 }
d9fe7d23
KW
847}
848
658db622
Z
849/*
850=for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
851
852Generates the message string describing an OS error and returns it as
853an SV. C<errnum> must be a value that C<errno> could take, identifying
854the type of error.
855
856If C<tgtsv> is non-null then the string will be written into that SV
857(overwriting existing content) and it will be returned. If C<tgtsv>
858is a null pointer then the string will be written into a new mortal SV
859which will be returned.
860
861The message will be taken from whatever locale would be used by C<$!>,
862and will be encoded in the SV in whatever manner would be used by C<$!>.
863The details of this process are subject to future change. Currently,
864the message is taken from the C locale by default (usually producing an
865English message), and from the currently selected locale when in the scope
866of the C<use locale> pragma. A heuristic attempt is made to decode the
867message from the locale's character encoding, but it will only be decoded
868as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
869locale, usually in an ISO-8859-1 locale, and never in any other locale.
870
871The SV is always returned containing an actual string, and with no other
872OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
873(meaning success), and if no useful message is available then a useless
874string (currently empty) is returned.
875
876=cut
877*/
878
879SV *
880Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
881{
882 char const *errstr;
883 if(!tgtsv)
884 tgtsv = sv_newmortal();
885 errstr = my_strerror(errnum);
886 if(errstr) {
887 sv_setpv(tgtsv, errstr);
888 fixup_errno_string(tgtsv);
889 } else {
890 SvPVCLEAR(tgtsv);
891 }
892 return tgtsv;
893}
894
25bbd826
CB
895#ifdef VMS
896#include <descrip.h>
897#include <starlet.h>
898#endif
899
79072805 900int
864dbfa3 901Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 902{
eb578fdb
KW
903 I32 paren;
904 const char *s = NULL;
905 REGEXP *rx;
823a54a3 906 const char * const remaining = mg->mg_ptr + 1;
e91d8259 907 char nextchar;
79072805 908
7918f24d
NC
909 PERL_ARGS_ASSERT_MAGIC_GET;
910
e91d8259 911 if (!mg->mg_ptr) {
e91d8259 912 paren = mg->mg_len;
e91d8259 913 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 914 do_numbuf_fetch:
e91d8259 915 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 916 }
e03e82a0
DM
917 else
918 goto set_undef;
e91d8259
NC
919 return 0;
920 }
921
922 nextchar = *remaining;
79072805 923 switch (*mg->mg_ptr) {
748a9306 924 case '\001': /* ^A */
f2da823f 925 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
926 else
927 sv_set_undef(sv);
125b9982
NT
928 if (SvTAINTED(PL_bodytarget))
929 SvTAINTED_on(sv);
748a9306 930 break;
e5218da5 931 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 932 if (nextchar == '\0') {
e5218da5
GA
933 sv_setiv(sv, (IV)PL_minus_c);
934 }
823a54a3 935 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
936 sv_setiv(sv, (IV)STATUS_NATIVE);
937 }
49460fe6
NIS
938 break;
939
79072805 940 case '\004': /* ^D */
aea4f609 941 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 942 break;
28f23441 943 case '\005': /* ^E */
6c6eab55
KW
944 if (nextchar != '\0') {
945 if (strEQ(remaining, "NCODING"))
3773545d 946 sv_set_undef(sv);
4f4ff3a7 947 break;
6c6eab55 948 }
4f4ff3a7
KW
949
950#if defined(VMS) || defined(OS2) || defined(WIN32)
951# if defined(VMS)
2a99ff86
KW
952 {
953 char msg[255];
954 $DESCRIPTOR(msgdsc,msg);
955 sv_setnv(sv,(NV) vaxc$errno);
956 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
957 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
958 else
b2aed775 959 SvPVCLEAR(sv);
2a99ff86 960 }
4b645107 961#elif defined(OS2)
2a99ff86
KW
962 if (!(_emx_env & 0x200)) { /* Under DOS */
963 sv_setnv(sv, (NV)errno);
2c6ee1a7 964 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
965 } else {
966 if (errno != errno_isOS2) {
967 const int tmp = _syserrno();
968 if (tmp) /* 2nd call to _syserrno() makes it 0 */
969 Perl_rc = tmp;
970 }
971 sv_setnv(sv, (NV)Perl_rc);
972 sv_setpv(sv, os2error(Perl_rc));
973 }
1534c6f5 974 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
975 fixup_errno_string(sv);
976 }
4f4ff3a7 977# elif defined(WIN32)
2a99ff86
KW
978 {
979 const DWORD dwErr = GetLastError();
980 sv_setnv(sv, (NV)dwErr);
981 if (dwErr) {
982 PerlProc_GetOSError(sv, dwErr);
2efab60d 983 fixup_errno_string(sv);
2a99ff86
KW
984 }
985 else
b2aed775 986 SvPVCLEAR(sv);
2a99ff86
KW
987 SetLastError(dwErr);
988 }
4f4ff3a7
KW
989# else
990# error Missing code for platform
991# endif
2a99ff86
KW
992 SvRTRIM(sv);
993 SvNOK_on(sv); /* what a wonderful hack! */
994 break;
4f4ff3a7
KW
995#endif /* End of platforms with special handling for $^E; others just fall
996 through to $! */
2165bd23 997 /* FALLTHROUGH */
46f3e16c
KW
998
999 case '!':
1000 {
5f1b979d 1001 dSAVE_ERRNO;
46f3e16c 1002#ifdef VMS
5f1b979d 1003 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 1004#else
5f1b979d 1005 sv_setnv(sv, (NV)errno);
46f3e16c
KW
1006#endif
1007#ifdef OS2
5f1b979d
KW
1008 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1009 sv_setpv(sv, os2error(Perl_rc));
1010 else
46f3e16c 1011#endif
5f1b979d 1012 if (! errno) {
b2aed775 1013 SvPVCLEAR(sv);
46f3e16c 1014 }
5f1b979d 1015 else {
658db622
Z
1016 sv_string_from_errnum(errno, sv);
1017 /* If no useful string is available, don't
1018 * claim to have a string part. The SvNOK_on()
5f1b979d 1019 * below will cause just the number part to be valid */
658db622
Z
1020 if (!SvCUR(sv))
1021 SvPOK_off(sv);
5f1b979d
KW
1022 }
1023 RESTORE_ERRNO;
46f3e16c
KW
1024 }
1025
1026 SvRTRIM(sv);
1027 SvNOK_on(sv); /* what a wonderful hack! */
1028 break;
1029
79072805 1030 case '\006': /* ^F */
3280af22 1031 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 1032 break;
9ebf26ad
FR
1033 case '\007': /* ^GLOBAL_PHASE */
1034 if (strEQ(remaining, "LOBAL_PHASE")) {
1035 sv_setpvn(sv, PL_phase_names[PL_phase],
1036 strlen(PL_phase_names[PL_phase]));
1037 }
1038 break;
a0d0e21e 1039 case '\010': /* ^H */
5d382c25 1040 sv_setuv(sv, PL_hints);
a0d0e21e 1041 break;
9d116dd7 1042 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1043 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1044 break;
8561ea1d
FC
1045 case '\014': /* ^LAST_FH */
1046 if (strEQ(remaining, "AST_FH")) {
745e740c 1047 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1048 assert(isGV_with_GP(PL_last_in_gv));
1049 SV_CHECK_THINKFIRST_COW_DROP(sv);
1050 prepare_SV_for_RV(sv);
1051 SvOK_off(sv);
1052 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1053 SvROK_on(sv);
1054 sv_rvweaken(sv);
1055 }
3773545d
DM
1056 else
1057 sv_set_undef(sv);
8561ea1d
FC
1058 }
1059 break;
ac27b0f5 1060 case '\017': /* ^O & ^OPEN */
823a54a3 1061 if (nextchar == '\0') {
ac27b0f5 1062 sv_setpv(sv, PL_osname);
3511154c
DM
1063 SvTAINTED_off(sv);
1064 }
823a54a3 1065 else if (strEQ(remaining, "PEN")) {
8b850bd5 1066 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1067 }
28f23441 1068 break;
9ebf26ad 1069 case '\020':
a6d0b1b5 1070 sv_setiv(sv, (IV)PL_perldb);
79072805 1071 break;
fb73857a 1072 case '\023': /* ^S */
a6d0b1b5 1073 {
bc177e6b 1074 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1075 SvOK_off(sv);
3280af22 1076 else if (PL_in_eval)
6dc8a9e4 1077 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1078 else
1079 sv_setiv(sv, 0);
d58bf5aa 1080 }
fb73857a 1081 break;
79072805 1082 case '\024': /* ^T */
823a54a3 1083 if (nextchar == '\0') {
88e89b8a 1084#ifdef BIG_TIME
7c36658b 1085 sv_setnv(sv, PL_basetime);
88e89b8a 1086#else
7c36658b 1087 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1088#endif
7c36658b 1089 }
823a54a3 1090 else if (strEQ(remaining, "AINT"))
284167a5
SM
1091 sv_setiv(sv, TAINTING_get
1092 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1093 : 0);
7c36658b 1094 break;
e07ea26a 1095 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1096 if (strEQ(remaining, "NICODE"))
a05d7ebb 1097 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1098 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1099 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1100 else if (strEQ(remaining, "TF8CACHE"))
1101 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1102 break;
1103 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1104 if (nextchar == '\0')
8298454c 1105 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1106 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1107 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1108 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1109 }
1110 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1111 goto set_undef;
013b78e8 1112 }
d3a7d8c7 1113 else if (PL_compiling.cop_warnings == pWARN_ALL) {
006c1a1d 1114 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1115 }
4438c4b7 1116 else {
72dc9ed5
NC
1117 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1118 *PL_compiling.cop_warnings);
ac27b0f5 1119 }
4438c4b7 1120 }
8ca2a5d6
DD
1121#ifdef WIN32
1122 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1123 sv_setiv(sv, w32_sloppystat);
1124 }
1125#endif
79072805 1126 break;
79072805 1127 case '+':
aaa362c4 1128 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1129 paren = RX_LASTPAREN(rx);
1130 if (paren)
1131 goto do_numbuf_fetch;
79072805 1132 }
e03e82a0 1133 goto set_undef;
a01268b5
JH
1134 case '\016': /* ^N */
1135 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1136 paren = RX_LASTCLOSEPAREN(rx);
1137 if (paren)
1138 goto do_numbuf_fetch;
a01268b5 1139 }
e03e82a0 1140 goto set_undef;
79072805 1141 case '.':
3280af22 1142 if (GvIO(PL_last_in_gv)) {
357c8808 1143 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1144 }
79072805
LW
1145 break;
1146 case '?':
809a5acc 1147 {
809a5acc 1148 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1149#ifdef COMPLEX_STATUS
41cb7b2b 1150 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1151 LvTARGOFF(sv) = PL_statusvalue;
1152 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1153#endif
809a5acc 1154 }
79072805
LW
1155 break;
1156 case '^':
acbe1b9d 1157 if (GvIOp(PL_defoutgv))
099be4f1 1158 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1159 if (s)
1160 sv_setpv(sv,s);
1161 else {
3280af22 1162 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1163 sv_catpvs(sv,"_TOP");
79072805
LW
1164 }
1165 break;
1166 case '~':
acbe1b9d 1167 if (GvIOp(PL_defoutgv))
0daa599b 1168 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1169 if (!s)
3280af22 1170 s = GvENAME(PL_defoutgv);
79072805
LW
1171 sv_setpv(sv,s);
1172 break;
79072805 1173 case '=':
099be4f1 1174 if (GvIO(PL_defoutgv))
0daa599b 1175 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1176 break;
1177 case '-':
099be4f1 1178 if (GvIO(PL_defoutgv))
0daa599b 1179 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1180 break;
1181 case '%':
099be4f1 1182 if (GvIO(PL_defoutgv))
0daa599b 1183 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1184 break;
79072805 1185 case ':':
79072805
LW
1186 case '/':
1187 break;
1188 case '[':
e1dccc0d 1189 sv_setiv(sv, 0);
79072805
LW
1190 break;
1191 case '|':
099be4f1 1192 if (GvIO(PL_defoutgv))
0daa599b 1193 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1194 break;
79072805 1195 case '\\':
b2ce0fda 1196 if (PL_ors_sv)
f28098ff 1197 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1198 else
e03e82a0 1199 goto set_undef;
79072805 1200 break;
0e219455 1201 case '$': /* $$ */
9cdac2a2
FC
1202 {
1203 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1204 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1205 /* never set manually, or at least not since last fork */
1206 sv_setiv(sv, pid);
19db9fb7
Z
1207 /* never unsafe, even if reading in a tainted expression */
1208 SvTAINTED_off(sv);
1209 }
9cdac2a2
FC
1210 /* else a value has been assigned manually, so do nothing */
1211 }
0e219455 1212 break;
79072805 1213 case '<':
dfff4baf 1214 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1215 break;
1216 case '>':
dfff4baf 1217 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1218 break;
1219 case '(':
dfff4baf 1220 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1221 goto add_groups;
1222 case ')':
dfff4baf 1223 sv_setgid(sv, PerlProc_getegid());
79072805 1224 add_groups:
79072805 1225#ifdef HAS_GETGROUPS
79072805 1226 {
57d7c65e 1227 Groups_t *gary = NULL;
375ed12a
JH
1228 I32 num_groups = getgroups(0, gary);
1229 if (num_groups > 0) {
19742f39 1230 I32 i;
375ed12a
JH
1231 Newx(gary, num_groups, Groups_t);
1232 num_groups = getgroups(num_groups, gary);
1233 for (i = 0; i < num_groups; i++)
147e3846 1234 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1235 Safefree(gary);
1236 }
79072805 1237 }
155aba94 1238 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1239#endif
79072805 1240 break;
79072805
LW
1241 case '0':
1242 break;
1243 }
a0d0e21e 1244 return 0;
e03e82a0
DM
1245
1246 set_undef:
1247 sv_set_undef(sv);
1248 return 0;
79072805
LW
1249}
1250
1251int
864dbfa3 1252Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1253{
8772537c 1254 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1255
7918f24d
NC
1256 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1257
79072805 1258 if (uf && uf->uf_val)
24f81a43 1259 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1260 return 0;
1261}
1262
1263int
864dbfa3 1264Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1265{
9ae3433d 1266 STRLEN len = 0, klen;
12033064 1267 const char * const key = MgPV_const(mg,klen);
888a67f6 1268 const char *s = "";
1e422769 1269
7918f24d
NC
1270 PERL_ARGS_ASSERT_MAGIC_SETENV;
1271
613c63b4 1272 SvGETMAGIC(sv);
12033064 1273 if (SvOK(sv)) {
613c63b4
CS
1274 /* defined environment variables are byte strings; unfortunately
1275 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1276 (void)SvPV_force_nomg_nolen(sv);
1277 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1278 if (SvUTF8(sv)) {
1279 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1280 SvUTF8_off(sv);
1281 }
1282 s = SvPVX(sv);
1283 len = SvCUR(sv);
12033064
CS
1284 }
1285 my_setenv(key, s); /* does the deed */
1286
a0d0e21e
LW
1287#ifdef DYNAMIC_ENV_FETCH
1288 /* We just undefd an environment var. Is a replacement */
1289 /* waiting in the wings? */
1290 if (!len) {
6bd66ee9 1291 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1292 if (valp)
4ab59fcc 1293 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1294 }
1295#endif
1e422769 1296
28542d8f 1297#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1298 /* And you'll never guess what the dog had */
1299 /* in its mouth... */
284167a5 1300 if (TAINTING_get) {
1e422769
PP
1301 MgTAINTEDDIR_off(mg);
1302#ifdef VMS
b2aed775 1303 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1304 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1305 int i = 0, j = 0;
1306
6fca0082 1307 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1308 elt = eltbuf;
1e422769
PP
1309 do { /* DCL$PATH may be a search list */
1310 while (1) { /* as may dev portion of any element */
1311 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1312 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1313 cando_by_name(S_IWUSR,0,elt) ) {
1314 MgTAINTEDDIR_on(mg);
1315 return 0;
1316 }
1317 }
bd61b366 1318 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1319 *cp = '\0';
1320 if (my_trnlnm(elt, eltbuf, j++))
1321 elt = eltbuf;
1322 else
1323 break;
1324 }
1325 j = 0;
1326 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1327 }
1328#endif /* VMS */
b2aed775 1329 if (s && memEQs(key, klen, "PATH")) {
8772537c 1330 const char * const strend = s + len;
463ee0b2 1331
70b484a8
DM
1332 /* set MGf_TAINTEDDIR if any component of the new path is
1333 * relative or world-writeable */
463ee0b2 1334 while (s < strend) {
96827780 1335 char tmpbuf[256];
c623ac67 1336 Stat_t st;
5f74f29c 1337 I32 i;
83269ced
CB
1338#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1339 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1340#else
1341 const char path_sep = ':';
1342#endif
ba0a4150 1343 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1344 s, strend, path_sep, &i);
463ee0b2 1345 s++;
bb7a0f54 1346 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1347#ifdef __VMS
1348 /* no colon thus no device name -- assume relative path */
1349 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1350 /* Using Unix separator, e.g. under bash, so act line Unix */
1351 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1352#else
1353 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1354#endif
c6ed36e1 1355 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1356 MgTAINTEDDIR_on(mg);
1e422769
PP
1357 return 0;
1358 }
463ee0b2 1359 }
79072805
LW
1360 }
1361 }
28542d8f 1362#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1363
79072805
LW
1364 return 0;
1365}
1366
1367int
864dbfa3 1368Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1369{
7918f24d 1370 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1371 PERL_UNUSED_ARG(sv);
bd61b366 1372 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1373 return 0;
1374}
1375
88e89b8a 1376int
864dbfa3 1377Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1378{
7918f24d 1379 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1380 PERL_UNUSED_ARG(mg);
b0269e46 1381#if defined(VMS)
cea2e8a9 1382 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1383#else
3280af22 1384 if (PL_localizing) {
fb73857a 1385 HE* entry;
b0269e46 1386 my_clearenv();
85fbaab2
NC
1387 hv_iterinit(MUTABLE_HV(sv));
1388 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1389 I32 keylen;
1390 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1391 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1392 }
1393 }
1394#endif
1395 return 0;
1396}
1397
1398int
864dbfa3 1399Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1400{
7918f24d 1401 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1402 PERL_UNUSED_ARG(sv);
1403 PERL_UNUSED_ARG(mg);
b0269e46
AB
1404#if defined(VMS)
1405 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1406#else
1407 my_clearenv();
1408#endif
3e3baf6d 1409 return 0;
66b1d557
HM
1410}
1411
64ca3a65 1412#ifndef PERL_MICRO
2d4fcd5e
AJ
1413#ifdef HAS_SIGPROCMASK
1414static void
1415restore_sigmask(pTHX_ SV *save_sv)
1416{
0bd48802 1417 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1418 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1419}
1420#endif
66b1d557 1421int
864dbfa3 1422Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1423{
88e89b8a 1424 /* Are we fetching a signal entry? */
708854f2 1425 int i = (I16)mg->mg_private;
7918f24d
NC
1426
1427 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1428
708854f2 1429 if (!i) {
84c7b88c
BF
1430 STRLEN siglen;
1431 const char * sig = MgPV_const(mg, siglen);
1432 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1433 }
1434
e02bfb16 1435 if (i > 0) {
22c35a8c
GS
1436 if(PL_psig_ptr[i])
1437 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1438 else {
46da273f 1439 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1440#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1441 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1442 sigstate = SIG_IGN;
2e34cc90
CL
1443#endif
1444#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1445 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1446 sigstate = SIG_DFL;
85b332e2 1447#endif
88e89b8a 1448 /* cache state so we don't fetch it again */
8aad04aa 1449 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1450 sv_setpvs(sv,"IGNORE");
88e89b8a 1451 else
e03e82a0 1452 sv_set_undef(sv);
46da273f 1453 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1454 SvTEMP_off(sv);
1455 }
1456 }
1457 return 0;
1458}
1459int
864dbfa3 1460Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1461{
7918f24d 1462 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1463
38a124f0 1464 magic_setsig(NULL, mg);
179c85a2 1465 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1466}
3d37d572 1467
0a8e0eff 1468Signal_t
8aad04aa 1469#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1470Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1471#else
0a8e0eff 1472Perl_csighandler(int sig)
8aad04aa 1473#endif
0a8e0eff 1474{
1018e26f
NIS
1475#ifdef PERL_GET_SIG_CONTEXT
1476 dTHXa(PERL_GET_SIG_CONTEXT);
1477#else
85b332e2
CL
1478 dTHX;
1479#endif
1271a1be 1480#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1481#if defined(__cplusplus) && defined(__GNUC__)
1482 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1483 * parameters would be warned about. */
1484 PERL_UNUSED_ARG(sip);
1485 PERL_UNUSED_ARG(uap);
1486#endif
1271a1be 1487#endif
23ada85b 1488#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1489 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1490 if (PL_sig_ignoring[sig]) return;
85b332e2 1491#endif
2e34cc90 1492#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1493 if (PL_sig_defaulting[sig])
2e34cc90
CL
1494#ifdef KILL_BY_SIGPRC
1495 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1496#else
1497 exit(1);
1498#endif
1499#endif
406878dd 1500 if (
853d2c32
RGS
1501#ifdef SIGILL
1502 sig == SIGILL ||
1503#endif
1504#ifdef SIGBUS
1505 sig == SIGBUS ||
1506#endif
1507#ifdef SIGSEGV
1508 sig == SIGSEGV ||
1509#endif
1510 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1511 /* Call the perl level handler now--
31c91b43 1512 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1513#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1514 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1515#else
1516 (*PL_sighandlerp)(sig);
92807b6d 1517#endif
406878dd 1518 else {
31c91b43 1519 if (!PL_psig_pend) return;
406878dd
GA
1520 /* Set a flag to say this signal is pending, that is awaiting delivery after
1521 * the current Perl opcode completes */
1522 PL_psig_pend[sig]++;
1523
1524#ifndef SIG_PENDING_DIE_COUNT
1525# define SIG_PENDING_DIE_COUNT 120
1526#endif
fe13d51d 1527 /* Add one to say _a_ signal is pending */
406878dd
GA
1528 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1529 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1530 (unsigned long)SIG_PENDING_DIE_COUNT);
1531 }
0a8e0eff
NIS
1532}
1533
2e34cc90
CL
1534#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1535void
1536Perl_csighandler_init(void)
1537{
1538 int sig;
27da23d5 1539 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1540
1541 for (sig = 1; sig < SIG_SIZE; sig++) {
1542#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1543 dTHX;
27da23d5 1544 PL_sig_defaulting[sig] = 1;
5c1546dc 1545 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1546#endif
1547#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1548 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1549#endif
1550 }
27da23d5 1551 PL_sig_handlers_initted = 1;
2e34cc90
CL
1552}
1553#endif
1554
7fe50b8b
LT
1555#if defined HAS_SIGPROCMASK
1556static void
1557unblock_sigmask(pTHX_ void* newset)
1558{
dc3bf405 1559 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1560 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1561}
1562#endif
1563
0a8e0eff
NIS
1564void
1565Perl_despatch_signals(pTHX)
1566{
1567 int sig;
1568 PL_sig_pending = 0;
1569 for (sig = 1; sig < SIG_SIZE; sig++) {
1570 if (PL_psig_pend[sig]) {
d0166017 1571 dSAVE_ERRNO;
7fe50b8b 1572#ifdef HAS_SIGPROCMASK
55534442
LT
1573 /* From sigaction(2) (FreeBSD man page):
1574 * | Signal routines normally execute with the signal that
1575 * | caused their invocation blocked, but other signals may
1576 * | yet occur.
1577 * Emulation of this behavior (from within Perl) is enabled
1578 * using sigprocmask
1579 */
1580 int was_blocked;
1581 sigset_t newset, oldset;
1582
1583 sigemptyset(&newset);
1584 sigaddset(&newset, sig);
1585 sigprocmask(SIG_BLOCK, &newset, &oldset);
1586 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1587 if (!was_blocked) {
1588 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1589 ENTER;
1590 SAVEFREESV(save_sv);
1591 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1592 }
55534442 1593#endif
25da4428 1594 PL_psig_pend[sig] = 0;
6e324d09 1595#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1596 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1597#else
1598 (*PL_sighandlerp)(sig);
92807b6d 1599#endif
7fe50b8b 1600#ifdef HAS_SIGPROCMASK
55534442 1601 if (!was_blocked)
7fe50b8b 1602 LEAVE;
55534442 1603#endif
d0166017 1604 RESTORE_ERRNO;
0a8e0eff
NIS
1605 }
1606 }
1607}
1608
38a124f0 1609/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1610int
864dbfa3 1611Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1612{
27da23d5 1613 dVAR;
79072805 1614 I32 i;
cbbf8932 1615 SV** svp = NULL;
2d4fcd5e
AJ
1616 /* Need to be careful with SvREFCNT_dec(), because that can have side
1617 * effects (due to closures). We must make sure that the new disposition
1618 * is in place before it is called.
1619 */
cbbf8932 1620 SV* to_dec = NULL;
e72dc28c 1621 STRLEN len;
2d4fcd5e
AJ
1622#ifdef HAS_SIGPROCMASK
1623 sigset_t set, save;
1624 SV* save_sv;
1625#endif
eb578fdb 1626 const char *s = MgPV_const(mg,len);
7918f24d
NC
1627
1628 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1629
748a9306 1630 if (*s == '_') {
84c7b88c 1631 if (memEQs(s, len, "__DIE__"))
3280af22 1632 svp = &PL_diehook;
84c7b88c 1633 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1634 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1635 /* Merge the existing behaviours, which are as follows:
1636 magic_setsig, we always set svp to &PL_warnhook
1637 (hence we always change the warnings handler)
1638 For magic_clearsig, we don't change the warnings handler if it's
1639 set to the &PL_warnhook. */
3280af22 1640 svp = &PL_warnhook;
84c7b88c
BF
1641 } else if (sv) {
1642 SV *tmp = sv_newmortal();
1643 Perl_croak(aTHX_ "No such hook: %s",
1644 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1645 }
748a9306 1646 i = 0;
38a124f0 1647 if (svp && *svp) {
9289f461
RGS
1648 if (*svp != PERL_WARNHOOK_FATAL)
1649 to_dec = *svp;
cbbf8932 1650 *svp = NULL;
4633a7c4 1651 }
748a9306
LW
1652 }
1653 else {
708854f2
NC
1654 i = (I16)mg->mg_private;
1655 if (!i) {
84c7b88c 1656 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1657 mg->mg_private = (U16)i;
708854f2 1658 }
86d86cad 1659 if (i <= 0) {
84c7b88c
BF
1660 if (sv) {
1661 SV *tmp = sv_newmortal();
1662 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1663 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1664 }
748a9306
LW
1665 return 0;
1666 }
2d4fcd5e
AJ
1667#ifdef HAS_SIGPROCMASK
1668 /* Avoid having the signal arrive at a bad time, if possible. */
1669 sigemptyset(&set);
1670 sigaddset(&set,i);
1671 sigprocmask(SIG_BLOCK, &set, &save);
1672 ENTER;
9ff8e806 1673 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1674 SAVEFREESV(save_sv);
1675 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1676#endif
1677 PERL_ASYNC_CHECK();
2e34cc90 1678#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1679 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1680#endif
23ada85b 1681#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1682 PL_sig_ignoring[i] = 0;
85b332e2 1683#endif
2e34cc90 1684#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1685 PL_sig_defaulting[i] = 0;
2e34cc90 1686#endif
2d4fcd5e 1687 to_dec = PL_psig_ptr[i];
38a124f0
NC
1688 if (sv) {
1689 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1690 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1691
1692 /* Signals don't change name during the program's execution, so once
1693 they're cached in the appropriate slot of PL_psig_name, they can
1694 stay there.
1695
1696 Ideally we'd find some way of making SVs at (C) compile time, or
1697 at least, doing most of the work. */
1698 if (!PL_psig_name[i]) {
1699 PL_psig_name[i] = newSVpvn(s, len);
1700 SvREADONLY_on(PL_psig_name[i]);
1701 }
38a124f0 1702 } else {
79fd3822 1703 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1704 PL_psig_name[i] = NULL;
1705 PL_psig_ptr[i] = NULL;
1706 }
748a9306 1707 }
38a124f0 1708 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1709 if (i) {
5c1546dc 1710 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1711 }
748a9306 1712 else
b37c2d43 1713 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1714 } else {
9dfa190b
NC
1715 if (sv && SvOK(sv)) {
1716 s = SvPV_force(sv, len);
1717 } else {
1718 sv = NULL;
1719 }
84c7b88c 1720 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1721 if (i) {
23ada85b 1722#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1723 PL_sig_ignoring[i] = 1;
1724 (void)rsignal(i, PL_csighandlerp);
85b332e2 1725#else
9dfa190b 1726 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1727#endif
9dfa190b 1728 }
2d4fcd5e 1729 }
84c7b88c 1730 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1731 if (i) {
2e34cc90 1732#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1733 PL_sig_defaulting[i] = 1;
1734 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1735#else
9dfa190b 1736 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1737#endif
9dfa190b
NC
1738 }
1739 }
1740 else {
1741 /*
1742 * We should warn if HINT_STRICT_REFS, but without
1743 * access to a known hint bit in a known OP, we can't
1744 * tell whether HINT_STRICT_REFS is in force or not.
1745 */
0687887e 1746 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1747 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1748 SV_GMAGIC);
1749 if (i)
1750 (void)rsignal(i, PL_csighandlerp);
1751 else
1752 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1753 }
748a9306 1754 }
9dfa190b 1755
2d4fcd5e
AJ
1756#ifdef HAS_SIGPROCMASK
1757 if(i)
1758 LEAVE;
1759#endif
ef8d46e8 1760 SvREFCNT_dec(to_dec);
79072805
LW
1761 return 0;
1762}
64ca3a65 1763#endif /* !PERL_MICRO */
79072805
LW
1764
1765int
864dbfa3 1766Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1767{
7918f24d 1768 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1769 PERL_UNUSED_ARG(sv);
e1a479c5 1770
89c14e2e 1771 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1772 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1773 return 0;
1774
0e446081 1775 return magic_clearisa(NULL, mg);
463ee0b2
LW
1776}
1777
0e446081 1778/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1779int
52b45067
RD
1780Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1781{
52b45067 1782 HV* stash;
7918f24d
NC
1783 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1784
52b45067 1785 /* Bail out if destruction is going on */
627364f1 1786 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1787
0e446081
NC
1788 if (sv)
1789 av_clear(MUTABLE_AV(sv));
52b45067 1790
6624142a
FC
1791 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1792 /* This occurs with setisa_elem magic, which calls this
1793 same function. */
1794 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1795
316ebaf2 1796 assert(mg);
6624142a
FC
1797 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1798 SV **svp = AvARRAY((AV *)mg->mg_obj);
1799 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1800 while (items--) {
1801 stash = GvSTASH((GV *)*svp++);
1802 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1803 }
1804
1805 return 0;
1806 }
1807
52b45067 1808 stash = GvSTASH(
6624142a 1809 (const GV *)mg->mg_obj
52b45067
RD
1810 );
1811
00169e2c
FC
1812 /* The stash may have been detached from the symbol table, so check its
1813 name before doing anything. */
1814 if (stash && HvENAME_get(stash))
5562fa71 1815 mro_isa_changed_in(stash);
52b45067
RD
1816
1817 return 0;
1818}
1819
1820int
864dbfa3 1821Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1822{
85fbaab2 1823 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1824 I32 i = 0;
7918f24d
NC
1825
1826 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1827 PERL_UNUSED_ARG(mg);
7719e241 1828
6ff81951 1829 if (hv) {
497b47a8 1830 (void) hv_iterinit(hv);
ad64d0ec 1831 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1832 i = HvUSEDKEYS(hv);
497b47a8
JH
1833 else {
1834 while (hv_iternext(hv))
1835 i++;
1836 }
6ff81951
GS
1837 }
1838
1839 sv_setiv(sv, (IV)i);
1840 return 0;
1841}
1842
1843int
864dbfa3 1844Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1845{
7918f24d 1846 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1847 PERL_UNUSED_ARG(mg);
946ec16e 1848 if (LvTARG(sv)) {
85fbaab2 1849 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1850 }
1851 return 0;
ac27b0f5 1852}
946ec16e 1853
efaf3674
DM
1854/*
1855=for apidoc magic_methcall
1856
1857Invoke a magic method (like FETCH).
1858
2baee27b
FC
1859C<sv> and C<mg> are the tied thingy and the tie magic.
1860
1861C<meth> is the name of the method to call.
1862
1863C<argc> is the number of args (in addition to $self) to pass to the method.
1864
1865The C<flags> can be:
1866
1867 G_DISCARD invoke method with G_DISCARD flag and don't
1868 return a value
1869 G_UNDEF_FILL fill the stack with argc pointers to
1870 PL_sv_undef
1871
1872The arguments themselves are any values following the C<flags> argument.
efaf3674 1873
796b6530 1874Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1875
1876
1877=cut
1878*/
1879
1880SV*
36925d9e 1881Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1882 U32 argc, ...)
a0d0e21e
LW
1883{
1884 dSP;
efaf3674 1885 SV* ret = NULL;
463ee0b2 1886
7918f24d
NC
1887 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1888
efaf3674 1889 ENTER;
d1d7a15d
NC
1890
1891 if (flags & G_WRITING_TO_STDERR) {
1892 SAVETMPS;
1893
2782061f 1894 save_re_context();
d1d7a15d
NC
1895 SAVESPTR(PL_stderrgv);
1896 PL_stderrgv = NULL;
1897 }
1898
efaf3674 1899 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1900 PUSHMARK(SP);
efaf3674 1901
052a7c76
DM
1902 /* EXTEND() expects a signed argc; don't wrap when casting */
1903 assert(argc <= I32_MAX);
1904 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1905 PUSHs(SvTIED_obj(sv, mg));
1906 if (flags & G_UNDEF_FILL) {
1907 while (argc--) {
efaf3674 1908 PUSHs(&PL_sv_undef);
93965878 1909 }
67549bd2 1910 } else if (argc > 0) {
046b0c7d
NC
1911 va_list args;
1912 va_start(args, argc);
1913
1914 do {
1915 SV *const sv = va_arg(args, SV *);
1916 PUSHs(sv);
1917 } while (--argc);
1918
1919 va_end(args);
88e89b8a 1920 }
463ee0b2 1921 PUTBACK;
efaf3674 1922 if (flags & G_DISCARD) {
36925d9e 1923 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1924 }
1925 else {
36925d9e 1926 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1927 ret = *PL_stack_sp--;
1928 }
1929 POPSTACK;
d1d7a15d
NC
1930 if (flags & G_WRITING_TO_STDERR)
1931 FREETMPS;
efaf3674
DM
1932 LEAVE;
1933 return ret;
1934}
1935
efaf3674 1936/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1937
efaf3674 1938STATIC SV*
36925d9e 1939S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1940 int n, SV *val)
1941{
efaf3674
DM
1942 SV* arg1 = NULL;
1943
1944 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1945
1946 if (mg->mg_ptr) {
1947 if (mg->mg_len >= 0) {
db4b3a1d 1948 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1949 }
1950 else if (mg->mg_len == HEf_SVKEY)
1951 arg1 = MUTABLE_SV(mg->mg_ptr);
1952 }
1953 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1954 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1955 sv_2mortal(arg1);
1956 }
1957 if (!arg1) {
046b0c7d 1958 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1959 }
046b0c7d 1960 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1961}
1962
76e3520e 1963STATIC int
36925d9e 1964S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1965{
efaf3674 1966 SV* ret;
463ee0b2 1967
7918f24d
NC
1968 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1969
efaf3674
DM
1970 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1971 if (ret)
1972 sv_setsv(sv, ret);
a0d0e21e
LW
1973 return 0;
1974}
463ee0b2 1975
a0d0e21e 1976int
864dbfa3 1977Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1978{
7918f24d
NC
1979 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1980
fd69380d 1981 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1982 mg->mg_flags |= MGf_GSKIP;
36925d9e 1983 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1984 return 0;
1985}
1986
1987int
864dbfa3 1988Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1989{
b112cff9
DM
1990 MAGIC *tmg;
1991 SV *val;
7918f24d
NC
1992
1993 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1994
b112cff9
DM
1995 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1996 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1997 * public flags indicate its value based on copying from $val. Doing
1998 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1999 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2000 * wrong if $val happened to be tainted, as sv hasn't got magic
2001 * enabled, even though taint magic is in the chain. In which case,
2002 * fake up a temporary tainted value (this is easier than temporarily
2003 * re-enabling magic on sv). */
2004
284167a5 2005 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2006 && (tmg->mg_len & 1))
2007 {
2008 val = sv_mortalcopy(sv);
2009 SvTAINTED_on(val);
2010 }
2011 else
2012 val = sv;
2013
36925d9e 2014 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2015 return 0;
2016}
2017
2018int
864dbfa3 2019Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2020{
7918f24d
NC
2021 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2022
4c13be3f 2023 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2024 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2025}
463ee0b2 2026
93965878
NIS
2027
2028U32
864dbfa3 2029Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2030{
22846ab4 2031 I32 retval = 0;
efaf3674 2032 SV* retsv;
93965878 2033
7918f24d
NC
2034 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2035
36925d9e 2036 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2037 if (retsv) {
2038 retval = SvIV(retsv)-1;
22846ab4
AB
2039 if (retval < -1)
2040 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2041 }
22846ab4 2042 return (U32) retval;
93965878
NIS
2043}
2044
cea2e8a9
GS
2045int
2046Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2047{
7918f24d
NC
2048 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2049
36925d9e 2050 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2051 return 0;
2052}
2053
2054int
864dbfa3 2055Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2056{
efaf3674 2057 SV* ret;
463ee0b2 2058
7918f24d
NC
2059 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2060
36925d9e
RZ
2061 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2062 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2063 if (ret)
2064 sv_setsv(key,ret);
79072805
LW
2065 return 0;
2066}
2067
2068int
1146e912 2069Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2070{
7918f24d
NC
2071 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2072
36925d9e 2073 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2074}
a0d0e21e 2075
a3bcc51e
TP
2076SV *
2077Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2078{
5fcbf73d 2079 SV *retval;
ad64d0ec
NC
2080 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2081 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2082
7918f24d
NC
2083 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2084
a3bcc51e
TP
2085 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2086 SV *key;
bfcb3514 2087 if (HvEITER_get(hv))
a3bcc51e
TP
2088 /* we are in an iteration so the hash cannot be empty */
2089 return &PL_sv_yes;
2090 /* no xhv_eiter so now use FIRSTKEY */
2091 key = sv_newmortal();
ad64d0ec 2092 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2093 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2094 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2095 }
2096
2097 /* there is a SCALAR method that we can call */
36925d9e 2098 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2099 if (!retval)
5fcbf73d 2100 retval = &PL_sv_undef;
a3bcc51e
TP
2101 return retval;
2102}
2103
a0d0e21e 2104int
864dbfa3 2105Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2106{
089b5c60 2107 SV **svp;
7918f24d
NC
2108
2109 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2110
089b5c60
NC
2111 /* The magic ptr/len for the debugger's hash should always be an SV. */
2112 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2113 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2114 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2115 }
2116
2117 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2118 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2119 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2120 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2121
8772537c 2122 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2123 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2124 if (o) {
2125#ifdef PERL_DEBUG_READONLY_OPS
2126 Slab_to_rw(OpSLAB(o));
2127#endif
2128 /* set or clear breakpoint in the relevant control op */
089b5c60 2129 if (SvTRUE(sv))
88df5f01 2130 o->op_flags |= OPf_SPECIAL;
8772537c 2131 else
88df5f01
FC
2132 o->op_flags &= ~OPf_SPECIAL;
2133#ifdef PERL_DEBUG_READONLY_OPS
2134 Slab_to_ro(OpSLAB(o));
2135#endif
8772537c 2136 }
5df8de69 2137 }
79072805
LW
2138 return 0;
2139}
2140
2141int
8772537c 2142Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2143{
502c6561 2144 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2145
2146 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2147
83bf042f 2148 if (obj) {
e1dccc0d 2149 sv_setiv(sv, AvFILL(obj));
83bf042f 2150 } else {
3773545d 2151 sv_set_undef(sv);
83bf042f 2152 }
79072805
LW
2153 return 0;
2154}
2155
2156int
864dbfa3 2157Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2158{
502c6561 2159 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2160
2161 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2162
83bf042f 2163 if (obj) {
e1dccc0d 2164 av_fill(obj, SvIV(sv));
83bf042f 2165 } else {
a2a5de95
NC
2166 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2167 "Attempt to set length of freed array");
83bf042f
NC
2168 }
2169 return 0;
2170}
2171
2172int
83f29afa
VP
2173Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2174{
83f29afa
VP
2175 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2176 PERL_UNUSED_ARG(sv);
dc3bf405 2177 PERL_UNUSED_CONTEXT;
83f29afa
VP
2178
2179 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2180 if (sizeof(IV) == sizeof(SSize_t)) {
2181 *((IV *) &(mg->mg_len)) = 0;
2182 } else {
2183 if (mg->mg_ptr)
2184 *((IV *) mg->mg_ptr) = 0;
2185 }
83f29afa
VP
2186
2187 return 0;
2188}
2189
2190int
83bf042f
NC
2191Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2192{
7918f24d 2193 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2194 PERL_UNUSED_ARG(sv);
7918f24d 2195
94f3782b
DM
2196 /* during global destruction, mg_obj may already have been freed */
2197 if (PL_in_clean_all)
1ea47f64 2198 return 0;
94f3782b 2199
83bf042f
NC
2200 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2201
2202 if (mg) {
2203 /* arylen scalar holds a pointer back to the array, but doesn't own a
2204 reference. Hence the we (the array) are about to go away with it
2205 still pointing at us. Clear its pointer, else it would be pointing
2206 at free memory. See the comment in sv_magic about reference loops,
2207 and why it can't own a reference to us. */
2208 mg->mg_obj = 0;
2209 }
a0d0e21e
LW
2210 return 0;
2211}
2212
2213int
864dbfa3 2214Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2215{
16eb5365 2216 SV* const lsv = LvTARG(sv);
96c2a8ff 2217 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2218
2219 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2220 PERL_UNUSED_ARG(mg);
ac27b0f5 2221
6174b39a
FC
2222 if (found && found->mg_len != -1) {
2223 STRLEN i = found->mg_len;
25fdce4a 2224 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2225 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2226 sv_setuv(sv, i);
a0d0e21e 2227 return 0;
a0d0e21e 2228 }
3773545d 2229 sv_set_undef(sv);
a0d0e21e
LW
2230 return 0;
2231}
2232
2233int
864dbfa3 2234Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2235{
16eb5365 2236 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2237 SSize_t pos;
2238 STRLEN len;
53d44271 2239 MAGIC* found;
aec43834 2240 const char *s;
a0d0e21e 2241
7918f24d 2242 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2243 PERL_UNUSED_ARG(mg);
ac27b0f5 2244
96c2a8ff 2245 found = mg_find_mglob(lsv);
3881461a 2246 if (!found) {
a0d0e21e
LW
2247 if (!SvOK(sv))
2248 return 0;
96c2a8ff 2249 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2250 }
2251 else if (!SvOK(sv)) {
3881461a 2252 found->mg_len = -1;
a0d0e21e
LW
2253 return 0;
2254 }
aec43834 2255 s = SvPV_const(lsv, len);
a0d0e21e 2256
e1dccc0d 2257 pos = SvIV(sv);
a0ed51b3 2258
7e2040f0 2259 if (DO_UTF8(lsv)) {
19742f39 2260 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2261 if (ulen)
2262 len = ulen;
a0ed51b3
LW
2263 }
2264
a0d0e21e
LW
2265 if (pos < 0) {
2266 pos += len;
2267 if (pos < 0)
2268 pos = 0;
2269 }
eb160463 2270 else if (pos > (SSize_t)len)
a0d0e21e 2271 pos = len;
a0ed51b3 2272
3881461a 2273 found->mg_len = pos;
25fdce4a 2274 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2275
79072805
LW
2276 return 0;
2277}
2278
2279int
864dbfa3 2280Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2281{
2282 STRLEN len;
35a4481c 2283 SV * const lsv = LvTARG(sv);
b83604b4 2284 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2285 STRLEN offs = LvTARGOFF(sv);
2286 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2287 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2288 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2289
2290 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2291 PERL_UNUSED_ARG(mg);
6ff81951 2292
83f78d1a 2293 if (!translate_substr_offsets(
4ddea69a 2294 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2295 negoff ? -(IV)offs : (IV)offs, !negoff,
2296 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2297 )) {
2298 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2299 sv_set_undef(sv);
83f78d1a
FC
2300 return 0;
2301 }
2302
9aa983d2 2303 if (SvUTF8(lsv))
4ddea69a 2304 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2305 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2306 if (SvUTF8(lsv))
2ef4b674 2307 SvUTF8_on(sv);
6ff81951
GS
2308 return 0;
2309}
2310
2311int
864dbfa3 2312Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2313{
83f78d1a 2314 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2315 const char * const tmps = SvPV_const(sv, len);
dd374669 2316 SV * const lsv = LvTARG(sv);
777f7c56
EB
2317 STRLEN lvoff = LvTARGOFF(sv);
2318 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2319 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2320 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2321
2322 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2323 PERL_UNUSED_ARG(mg);
075a4a2b 2324
a74fb2cd
FC
2325 SvGETMAGIC(lsv);
2326 if (SvROK(lsv))
2327 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2328 "Attempt to use reference as lvalue in substr"
2329 );
fc061ed8
FC
2330 SvPV_force_nomg(lsv,lsv_len);
2331 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2332 if (!translate_substr_offsets(
2333 lsv_len,
2334 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2335 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2336 ))
2337 Perl_croak(aTHX_ "substr outside of string");
2338 oldtarglen = lvlen;
1aa99e6b 2339 if (DO_UTF8(sv)) {
73a087f0 2340 sv_utf8_upgrade_nomg(lsv);
d931b1be 2341 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2342 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2343 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2344 SvUTF8_on(lsv);
2345 }
0d336106 2346 else if (SvUTF8(lsv)) {
5fcbf73d 2347 const char *utf8;
d931b1be 2348 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2349 newtarglen = len;
5fcbf73d 2350 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2351 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2352 Safefree(utf8);
1aa99e6b 2353 }
b76f3ce2 2354 else {
a74fb2cd 2355 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2356 newtarglen = len;
b76f3ce2 2357 }
83f78d1a
FC
2358 if (!neglen) LvTARGLEN(sv) = newtarglen;
2359 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2360
79072805
LW
2361 return 0;
2362}
2363
2364int
864dbfa3 2365Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2366{
7918f24d 2367 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2368 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2369#ifdef NO_TAINT_SUPPORT
2370 PERL_UNUSED_ARG(mg);
2371#endif
7918f24d 2372
64ff300b 2373 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2374 return 0;
2375}
2376
2377int
864dbfa3 2378Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2379{
7918f24d 2380 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2381 PERL_UNUSED_ARG(sv);
7918f24d 2382
b01e650a 2383 /* update taint status */
284167a5 2384 if (TAINT_get)
b01e650a
DM
2385 mg->mg_len |= 1;
2386 else
2387 mg->mg_len &= ~1;
463ee0b2
LW
2388 return 0;
2389}
2390
2391int
864dbfa3 2392Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2393{
35a4481c 2394 SV * const lsv = LvTARG(sv);
1b92e694 2395 char errflags = LvFLAGS(sv);
7918f24d
NC
2396
2397 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2398 PERL_UNUSED_ARG(mg);
6ff81951 2399
1b92e694 2400 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2401 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2402 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2403
6ff81951
GS
2404 return 0;
2405}
2406
2407int
864dbfa3 2408Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2409{
7918f24d 2410 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2411 PERL_UNUSED_ARG(mg);
79072805
LW
2412 do_vecset(sv); /* XXX slurp this routine */
2413 return 0;
2414}
2415
13733cde
FC
2416SV *
2417Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2418{
a0714e2c 2419 SV *targ = NULL;
13733cde
FC
2420 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2421 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2422 assert(mg);
5f05dabc 2423 if (LvTARGLEN(sv)) {
68dc0745 2424 if (mg->mg_obj) {
8772537c 2425 SV * const ahv = LvTARG(sv);
85fbaab2 2426 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2427 if (he)
2428 targ = HeVAL(he);
68dc0745 2429 }
bbfdc870 2430 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2431 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2432 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2433 {
2434 if (SvRMAGICAL(av)) {
2435 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2436 targ = svp ? *svp : NULL;
2437 }
2438 else
bbfdc870 2439 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2440 }
68dc0745 2441 }
46da273f 2442 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2443 /* somebody else defined it for us */
2444 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2445 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2446 LvTARGLEN(sv) = 0;
2447 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2448 mg->mg_obj = NULL;
68dc0745
PP
2449 mg->mg_flags &= ~MGf_REFCOUNTED;
2450 }
13733cde 2451 return targ;
5f05dabc 2452 }
71be2cbc 2453 else
13733cde
FC
2454 return LvTARG(sv);
2455}
2456
2457int
2458Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2459{
2460 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2461
2462 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2463 return 0;
2464}
2465
2466int
864dbfa3 2467Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2468{
7918f24d 2469 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2470 PERL_UNUSED_ARG(mg);
71be2cbc 2471 if (LvTARGLEN(sv))
68dc0745
PP
2472 vivify_defelem(sv);
2473 if (LvTARG(sv)) {
5f05dabc 2474 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2475 SvSETMAGIC(LvTARG(sv));
2476 }
5f05dabc
PP
2477 return 0;
2478}
2479
71be2cbc 2480void
864dbfa3 2481Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2482{
74e13ce4 2483 MAGIC *mg;
a0714e2c 2484 SV *value = NULL;
71be2cbc 2485
7918f24d
NC
2486 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2487
14befaf4 2488 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2489 return;
68dc0745 2490 if (mg->mg_obj) {
8772537c 2491 SV * const ahv = LvTARG(sv);
85fbaab2 2492 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2493 if (he)
2494 value = HeVAL(he);
3280af22 2495 if (!value || value == &PL_sv_undef)
be2597df 2496 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2497 }
bbfdc870
FC
2498 else if (LvSTARGOFF(sv) < 0)
2499 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2500 else {
502c6561 2501 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2502 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2503 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2504 else {
bbfdc870 2505 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2506 if (!svp || !(value = *svp))
bbfdc870 2507 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2508 }
2509 }
b37c2d43 2510 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2511 SvREFCNT_dec(LvTARG(sv));
2512 LvTARG(sv) = value;
71be2cbc 2513 LvTARGLEN(sv) = 0;
68dc0745 2514 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2515 mg->mg_obj = NULL;
68dc0745 2516 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2517}
2518
2519int
864dbfa3 2520Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2521{
7918f24d 2522 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2523 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2524 return 0;
810b8aa5
GS
2525}
2526
2527int
864dbfa3 2528Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2529{
7918f24d 2530 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2531 PERL_UNUSED_CONTEXT;
0177730e 2532 PERL_UNUSED_ARG(sv);
565764a8 2533 mg->mg_len = -1;
93a17b20
LW
2534 return 0;
2535}
2536
2537int
864dbfa3 2538Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2539{
35a4481c 2540 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2541
7918f24d
NC
2542 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2543
79072805 2544 if (uf && uf->uf_set)
24f81a43 2545 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2546 return 0;
2547}
2548
c277df42 2549int
faf82a0b
AE
2550Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2551{
488344d2 2552 const char type = mg->mg_type;
7918f24d
NC
2553
2554 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2555
a5c7cb08
DM
2556 assert( type == PERL_MAGIC_fm
2557 || type == PERL_MAGIC_qr
2558 || type == PERL_MAGIC_bm);
488344d2 2559 return sv_unmagic(sv, type);
faf82a0b
AE
2560}
2561
7a4c00b4 2562#ifdef USE_LOCALE_COLLATE
79072805 2563int
864dbfa3 2564Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2565{
7918f24d
NC
2566 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2567
bbce6d69 2568 /*
838b5b74 2569 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2570 * and vanished with a faint plop.
2571 */
96a5add6 2572 PERL_UNUSED_CONTEXT;
8772537c 2573 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2574 if (mg->mg_ptr) {
2575 Safefree(mg->mg_ptr);
2576 mg->mg_ptr = NULL;
565764a8 2577 mg->mg_len = -1;
7a4c00b4 2578 }
bbce6d69
PP
2579 return 0;
2580}
7a4c00b4 2581#endif /* USE_LOCALE_COLLATE */
bbce6d69 2582
7e8c5dac
HS
2583/* Just clear the UTF-8 cache data. */
2584int
2585Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2586{
7918f24d 2587 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2588 PERL_UNUSED_CONTEXT;
8772537c 2589 PERL_UNUSED_ARG(sv);
7e8c5dac 2590 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2591 mg->mg_ptr = NULL;
7e8c5dac
HS
2592 mg->mg_len = -1; /* The mg_len holds the len cache. */
2593 return 0;
2594}
2595
bbce6d69 2596int
9cce4f9a
FC
2597Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2598{
9782ce69 2599 const char *bad = NULL;
9cce4f9a 2600 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2601 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2602 switch (mg->mg_private & OPpLVREF_TYPE) {
2603 case OPpLVREF_SV:
2604 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2605 bad = " SCALAR";
2606 break;
2607 case OPpLVREF_AV:
2608 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2609 bad = "n ARRAY";
2610 break;
2611 case OPpLVREF_HV:
2612 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2613 bad = " HASH";
2614 break;
2615 case OPpLVREF_CV:
2616 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2617 bad = " CODE";
2618 }
2619 if (bad)
26a50d99 2620 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2621 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2622 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2623 case 0:
2624 {
2625 SV * const old = PAD_SV(mg->mg_len);
2626 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2627 SvREFCNT_dec(old);
2628 break;
2629 }
2630 case SVt_PVGV:
2631 gv_setref(mg->mg_obj, sv);
2632 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2633 break;
2634 case SVt_PVAV:
2635 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2636 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2637 break;
2638 case SVt_PVHV:
7fcb36d5
JH
2639 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2640 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2641 }
d39c26a6
FC
2642 if (mg->mg_flags & MGf_PERSIST)
2643 NOOP; /* This sv is in use as an iterator var and will be reused,
2644 so we must leave the magic. */
2645 else
2646 /* This sv could be returned by the assignment op, so clear the
2647 magic, as lvrefs are an implementation detail that must not be
2648 leaked to the user. */
2649 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2650 return 0;
2651}
2652
f1540bed
JH
2653static void
2654S_set_dollarzero(pTHX_ SV *sv)
2655 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2656{
2657#ifdef USE_ITHREADS
2658 dVAR;
2659#endif
2660 const char *s;
2661 STRLEN len;
f1540bed
JH
2662#ifdef HAS_SETPROCTITLE
2663 /* The BSDs don't show the argv[] in ps(1) output, they
2664 * show a string from the process struct and provide
2665 * the setproctitle() routine to manipulate that. */
2666 if (PL_origalen != 1) {
2667 s = SvPV_const(sv, len);
38626956 2668# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2669 /* The leading "-" removes the "perl: " prefix,
2670 * but not the "(perl) suffix from the ps(1)
2671 * output, because that's what ps(1) shows if the
2672 * argv[] is modified. */
2673 setproctitle("-%s", s);
2674# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2675 /* This doesn't really work if you assume that
2676 * $0 = 'foobar'; will wipe out 'perl' from the $0
2677 * because in ps(1) output the result will be like
2678 * sprintf("perl: %s (perl)", s)
2679 * I guess this is a security feature:
2680 * one (a user process) cannot get rid of the original name.
2681 * --jhi */
2682 setproctitle("%s", s);
2683# endif
2684 }
2685#elif defined(__hpux) && defined(PSTAT_SETCMD)
2686 if (PL_origalen != 1) {
2687 union pstun un;
2688 s = SvPV_const(sv, len);
2689 un.pst_command = (char *)s;
2690 pstat(PSTAT_SETCMD, un, len, 0, 0);
2691 }
2692#else
2693 if (PL_origalen > 1) {
4f3e04fd 2694 I32 i;
f1540bed
JH
2695 /* PL_origalen is set in perl_parse(). */
2696 s = SvPV_force(sv,len);
2697 if (len >= (STRLEN)PL_origalen-1) {
2698 /* Longer than original, will be truncated. We assume that
2699 * PL_origalen bytes are available. */
2700 Copy(s, PL_origargv[0], PL_origalen-1, char);
2701 }
2702 else {
2703 /* Shorter than original, will be padded. */
2704#ifdef PERL_DARWIN
2705 /* Special case for Mac OS X: see [perl #38868] */
2706 const int pad = 0;
2707#else
2708 /* Is the space counterintuitive? Yes.
2709 * (You were expecting \0?)
2710 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2711 * --jhi */
2712 const int pad = ' ';
2713#endif
2714 Copy(s, PL_origargv[0], len, char);
2715 PL_origargv[0][len] = 0;
2716 memset(PL_origargv[0] + len + 1,
2717 pad, PL_origalen - len - 1);
2718 }
2719 PL_origargv[0][PL_origalen-1] = 0;
2720 for (i = 1; i < PL_origargc; i++)
2721 PL_origargv[i] = 0;
2722#ifdef HAS_PRCTL_SET_NAME
2723 /* Set the legacy process name in addition to the POSIX name on Linux */
2724 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2725 /* diag_listed_as: SKIPME */
2726 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2727 }
2728#endif
2729 }
2730#endif
2731}
2732
9cce4f9a 2733int
864dbfa3 2734Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2735{
20b7effb 2736#ifdef USE_ITHREADS
97aff369 2737 dVAR;
20b7effb 2738#endif
eb578fdb
KW
2739 I32 paren;
2740 const REGEXP * rx;
79072805 2741 I32 i;
8990e307 2742 STRLEN len;
125b9982 2743 MAGIC *tmg;
2fdbfb4d 2744
7918f24d
NC
2745 PERL_ARGS_ASSERT_MAGIC_SET;
2746
e91d8259 2747 if (!mg->mg_ptr) {
960b831f 2748 paren = mg->mg_len;
1e05feb3 2749 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2750 setparen_got_rx:
2fdbfb4d 2751 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2752 } else {
2fdbfb4d
AB
2753 /* Croak with a READONLY error when a numbered match var is
2754 * set without a previous pattern match. Unless it's C<local $1>
2755 */
e91d8259 2756 croakparen:
2fdbfb4d 2757 if (!PL_localizing) {
cb077ed2 2758 Perl_croak_no_modify();
2fdbfb4d
AB
2759 }
2760 }
e91d8259
NC
2761 return 0;
2762 }
2763
2764 switch (*mg->mg_ptr) {
748a9306 2765 case '\001': /* ^A */
f2da823f
FC
2766 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2767 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2768 FmLINES(PL_bodytarget) = 0;
2769 if (SvPOK(PL_bodytarget)) {
2770 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2771 char *e = SvEND(PL_bodytarget);
2772 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2773 FmLINES(PL_bodytarget)++;
2774 s++;
2775 }
2776 }
125b9982 2777 /* mg_set() has temporarily made sv non-magical */
284167a5 2778 if (TAINTING_get) {
125b9982
NT
2779 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2780 SvTAINTED_on(PL_bodytarget);
2781 else
2782 SvTAINTED_off(PL_bodytarget);
2783 }
748a9306 2784 break;
49460fe6 2785 case '\003': /* ^C */
f2338a2e 2786 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2787 break;
2788
79072805 2789 case '\004': /* ^D */
b4ab917c 2790#ifdef DEBUGGING
a9e2d2bf
DM
2791 {
2792 const char *s = SvPV_nolen_const(sv);
2793 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2794 if (DEBUG_x_TEST || DEBUG_B_TEST)
2795 dump_all_perl(!DEBUG_B_TEST);
2796 }
b4ab917c 2797#else
38ab35f8 2798 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2799#endif
79072805 2800 break;
28f23441 2801 case '\005': /* ^E */
d0063567 2802 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2803#ifdef VMS
38ab35f8 2804 set_vaxc_errno(SvIV(sv));
2abc681d 2805#elif defined(WIN32)
d0063567 2806 SetLastError( SvIV(sv) );
2abc681d 2807#elif defined(OS2)
38ab35f8 2808 os2_setsyserrno(SvIV(sv));
2abc681d 2809#else
d0063567 2810 /* will anyone ever use this? */
38ab35f8 2811 SETERRNO(SvIV(sv), 4);
22fae026 2812#endif
d0063567 2813 }
fd503f5c
DIM
2814 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2815 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2816 break;
79072805 2817 case '\006': /* ^F */
38ab35f8 2818 PL_maxsysfd = SvIV(sv);
79072805 2819 break;
a0d0e21e 2820 case '\010': /* ^H */
efa571ab
KW
2821 {
2822 U32 save_hints = PL_hints;
5d382c25 2823 PL_hints = SvUV(sv);
efa571ab
KW
2824
2825 /* If wasn't UTF-8, and now is, notify the parser */
2826 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2827 notify_parser_that_changed_to_utf8();
2828 }
2829 }
a0d0e21e 2830 break;
9d116dd7 2831 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2832 Safefree(PL_inplace);
bd61b366 2833 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2834 break;
d9bad346
FC
2835 case '\016': /* ^N */
2836 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2837 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2838 goto croakparen;
28f23441 2839 case '\017': /* ^O */
ac27b0f5 2840 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2841 Safefree(PL_osname);
bd61b366 2842 PL_osname = NULL;
3511154c
DM
2843 if (SvOK(sv)) {
2844 TAINT_PROPER("assigning to $^O");
2e0de35c 2845 PL_osname = savesvpv(sv);
3511154c 2846 }
ac27b0f5
NIS
2847 }
2848 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2849 STRLEN len;
2850 const char *const start = SvPV(sv, len);
b54fc2b6 2851 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2852 SV *tmp;
8b850bd5
NC
2853
2854
2855 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2856 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2857
2858 /* Opening for input is more common than opening for output, so
2859 ensure that hints for input are sooner on linked list. */
59cd0e26 2860 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2861 SvUTF8(sv))
2862 : newSVpvs_flags("", SvUTF8(sv));
2863 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2864 mg_set(tmp);
8b850bd5 2865
f747ebd6
Z
2866 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2867 SvUTF8(sv));
2868 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2869 mg_set(tmp);
ac27b0f5 2870 }
28f23441 2871 break;
79072805 2872 case '\020': /* ^P */
2fdbfb4d
AB
2873 PL_perldb = SvIV(sv);
2874 if (PL_perldb && !PL_DBsingle)
2875 init_debugger();
9b9e0be4 2876 break;
79072805 2877 case '\024': /* ^T */
88e89b8a 2878#ifdef BIG_TIME
6b88bc9c 2879 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2880#else
38ab35f8 2881 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2882#endif
79072805 2883 break;
e07ea26a
NC
2884 case '\025': /* ^UTF8CACHE */
2885 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2886 PL_utf8cache = (signed char) sv_2iv(sv);
2887 }
2888 break;
fde18df1 2889 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2890 if (*(mg->mg_ptr+1) == '\0') {
2891 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2892 i = SvIV(sv);
ac27b0f5 2893 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2894 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2895 }
599cee73 2896 }
0a378802 2897 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2898 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2899 if (!SvPOK(sv)) {
2900 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2901 break;
2902 }
f4fc7782 2903 {
b5477537 2904 STRLEN len, i;
006c1a1d
Z
2905 int not_none = 0, not_all = 0;
2906 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2907 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2908 not_none |= ptr[i];
2909 not_all |= ptr[i] ^ 0x55;
f4fc7782 2910 }
006c1a1d 2911 if (!not_none) {
4243c432
NC
2912 if (!specialWARN(PL_compiling.cop_warnings))
2913 PerlMemShared_free(PL_compiling.cop_warnings);
2914 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2915 } else if (len >= WARNsize && !not_all) {
2916 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2917 PerlMemShared_free(PL_compiling.cop_warnings);
2918 PL_compiling.cop_warnings = pWARN_ALL;
2919 PL_dowarn |= G_WARN_ONCE ;
2920 }
d3a7d8c7 2921 else {
72dc9ed5
NC
2922 STRLEN len;
2923 const char *const p = SvPV_const(sv, len);
2924
2925 PL_compiling.cop_warnings
8ee4cf24 2926 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2927 p, len);
2928
d3a7d8c7
GS
2929 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2930 PL_dowarn |= G_WARN_ONCE ;
2931 }
f4fc7782 2932
d3a7d8c7 2933 }
4438c4b7 2934 }
971a9dd3 2935 }
8ca2a5d6
DD
2936#ifdef WIN32
2937 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2938 w32_sloppystat = (bool)sv_true(sv);
2939 }
2940#endif
79072805
LW
2941 break;
2942 case '.':
3280af22
NIS
2943 if (PL_localizing) {
2944 if (PL_localizing == 1)
7766f137 2945 SAVESPTR(PL_last_in_gv);
748a9306 2946 }
3280af22 2947 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2948 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2949 break;
2950 case '^':
acbe1b9d 2951 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2952 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2953 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2954 break;
2955 case '~':
acbe1b9d 2956 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2957 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2958 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2959 break;
2960 case '=':
acbe1b9d 2961 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2962 break;
2963 case '-':
acbe1b9d
FC
2964 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2965 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2966 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2967 break;
2968 case '%':
acbe1b9d 2969 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2970 break;
2971 case '|':
4b65379b 2972 {
099be4f1 2973 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2974 if(!io)
2975 break;
38ab35f8 2976 if ((SvIV(sv)) == 0)
4b65379b
CS
2977 IoFLAGS(io) &= ~IOf_FLUSH;
2978 else {
2979 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2980 PerlIO *ofp = IoOFP(io);
2981 if (ofp)
2982 (void)PerlIO_flush(ofp);
2983 IoFLAGS(io) |= IOf_FLUSH;
2984 }
2985 }
79072805
LW
2986 }
2987 break;
79072805 2988 case '/':
1ab48e3a 2989 {
1ab48e3a 2990 if (SvROK(sv)) {
8d37cdf7
DIM
2991 SV *referent = SvRV(sv);
2992 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
2993 /* XXX: dodgy type check: This leaves me feeling dirty, but
2994 * the alternative is to copy pretty much the entire
2995 * sv_reftype() into this routine, or to do a full string
2996 * comparison on the return of sv_reftype() both of which
2997 * make me feel worse! NOTE, do not modify this comment
2998 * without reviewing the corresponding comment in
2999 * sv_reftype(). - Yves */
1ab48e3a 3000 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3001 IV val = SvIV(referent);
1ab48e3a 3002 if (val <= 0) {
520b6fb6
DIM
3003 sv_setsv(sv, PL_rs);
3004 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3005 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3006 }
3007 } else {
ddce084a 3008 sv_setsv(sv, PL_rs);
8d37cdf7 3009 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3010 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3011 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3012 }
3013 }
b3a2acfa 3014 SvREFCNT_dec(PL_rs);
520b6fb6 3015 PL_rs = newSVsv(sv);
b3a2acfa 3016 }
79072805
LW
3017 break;
3018 case '\\':
ef8d46e8 3019 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3020 if (SvOK(sv)) {
7889fe52 3021 PL_ors_sv = newSVsv(sv);
009c130f 3022 }
e3c19b7b 3023 else {
a0714e2c 3024 PL_ors_sv = NULL;
e3c19b7b 3025 }
79072805 3026 break;
7d69d4a6
FC
3027 case '[':
3028 if (SvIV(sv) != 0)
3029 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3030 break;
79072805 3031 case '?':
ff0cee69 3032#ifdef COMPLEX_STATUS
6b88bc9c 3033 if (PL_localizing == 2) {
41cb7b2b 3034 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3035 PL_statusvalue = LvTARGOFF(sv);
3036 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3037 }
3038 else
3039#endif
3040#ifdef VMSISH_STATUS
3041 if (VMSISH_STATUS)
fb38d079 3042 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3043 else
3044#endif
38ab35f8 3045 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3046 break;
3047 case '!':
93189314
JH
3048 {
3049#ifdef VMS
3050# define PERL_VMS_BANG vaxc$errno
3051#else
3052# define PERL_VMS_BANG 0
3053#endif
27329181 3054#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
3055 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3056 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3057#else
91487cfc 3058 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3059 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3060#endif
93189314 3061 }
79072805
LW
3062 break;
3063 case '<':
985213f2 3064 {
b469f1e0 3065 /* XXX $< currently silently ignores failures */
dfff4baf 3066 const Uid_t new_uid = SvUID(sv);
985213f2 3067 PL_delaymagic_uid = new_uid;
3280af22
NIS
3068 if (PL_delaymagic) {
3069 PL_delaymagic |= DM_RUID;
79072805
LW
3070 break; /* don't do magic till later */
3071 }
3072#ifdef HAS_SETRUID
b469f1e0 3073 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3074#elif defined(HAS_SETREUID)
b469f1e0 3075 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3076#elif defined(HAS_SETRESUID)
b469f1e0 3077 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3078#else
985213f2 3079 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3080# ifdef PERL_DARWIN
75870ed3 3081 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3082 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3083 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3084# endif
b469f1e0 3085 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3086 } else {
cea2e8a9 3087 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3088 }
79072805 3089#endif
79072805 3090 break;
985213f2 3091 }
79072805 3092 case '>':
985213f2 3093 {
b469f1e0 3094 /* XXX $> currently silently ignores failures */
dfff4baf 3095 const Uid_t new_euid = SvUID(sv);
985213f2 3096 PL_delaymagic_euid = new_euid;
3280af22
NIS
3097 if (PL_delaymagic) {
3098 PL_delaymagic |= DM_EUID;
79072805
LW
3099 break; /* don't do magic till later */
3100 }
3101#ifdef HAS_SETEUID
b469f1e0 3102 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3103#elif defined(HAS_SETREUID)
b469f1e0 3104 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3105#elif defined(HAS_SETRESUID)
b469f1e0 3106 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3107#else
985213f2 3108 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3109 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3110 else {
cea2e8a9 3111 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3112 }
79072805 3113#endif
79072805 3114 break;
985213f2 3115 }
79072805 3116 case '(':
985213f2 3117 {
b469f1e0 3118 /* XXX $( currently silently ignores failures */
dfff4baf 3119 const Gid_t new_gid = SvGID(sv);
985213f2 3120 PL_delaymagic_gid = new_gid;
3280af22
NIS
3121 if (PL_delaymagic) {
3122 PL_delaymagic |= DM_RGID;
79072805
LW
3123 break; /* don't do magic till later */
3124 }
3125#ifdef HAS_SETRGID
b469f1e0 3126 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3127#elif defined(HAS_SETREGID)
b469f1e0 3128 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3129#elif defined(HAS_SETRESGID)
b469f1e0 3130 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3131#else
985213f2 3132 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3133 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3134 else {
cea2e8a9 3135 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3136 }
79072805 3137#endif
79072805 3138 break;
985213f2 3139 }
79072805 3140 case ')':
985213f2 3141 {
0635704a
HS
3142/* (hv) best guess: maybe we'll need configure probes to do a better job,
3143 * but you can override it if you need to.
3144 */
3145#ifndef INVALID_GID
3146#define INVALID_GID ((Gid_t)-1)
3147#endif
b469f1e0 3148 /* XXX $) currently silently ignores failures */
dfff4baf 3149 Gid_t new_egid;
5cd24f17
PP
3150#ifdef HAS_SETGROUPS
3151 {
b83604b4 3152 const char *p = SvPV_const(sv, len);
757f63d8 3153 Groups_t *gary = NULL;
fdadaf77 3154 const char* endptr;
22ff3130 3155 UV uv;
fb4089e0 3156#ifdef _SC_NGROUPS_MAX
3157 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3158
3159 if (maxgrp < 0)
3160 maxgrp = NGROUPS;
3161#else
3162 int maxgrp = NGROUPS;
3163#endif
757f63d8
SP
3164
3165 while (isSPACE(*p))
3166 ++p;
22ff3130
HS
3167 if (grok_atoUV(p, &uv, &endptr))
3168 new_egid = (Gid_t)uv;
3169 else {
0635704a 3170 new_egid = INVALID_GID;
22ff3130
HS
3171 endptr = NULL;
3172 }
fb4089e0 3173 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3174 if (endptr == NULL)
3175 break;
3176 p = endptr;
757f63d8
SP
3177 while (isSPACE(*p))
3178 ++p;
3179 if (!*p)
3180 break;
fdadaf77 3181 if (!gary)
757f63d8
SP
3182 Newx(gary, i + 1, Groups_t);
3183 else
3184 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3185 if (grok_atoUV(p, &uv, &endptr))
3186 gary[i] = (Groups_t)uv;
3187 else {
0635704a 3188 gary[i] = INVALID_GID;
22ff3130
HS
3189 endptr = NULL;
3190 }
757f63d8
SP
3191 }
3192 if (i)
b469f1e0 3193 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3194 Safefree(gary);
5cd24f17
PP
3195 }
3196#else /* HAS_SETGROUPS */
dfff4baf 3197 new_egid = SvGID(sv);
5cd24f17 3198#endif /* HAS_SETGROUPS */
985213f2 3199 PL_delaymagic_egid = new_egid;
3280af22
NIS
3200 if (PL_delaymagic) {
3201 PL_delaymagic |= DM_EGID;
79072805
LW
3202 break; /* don't do magic till later */
3203 }
3204#ifdef HAS_SETEGID
b469f1e0 3205 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3206#elif defined(HAS_SETREGID)
b469f1e0 3207 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3208#elif defined(HAS_SETRESGID)
b469f1e0 3209 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3210#else
985213f2 3211 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3212 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3213 else {
cea2e8a9 3214 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3215 }
79072805 3216#endif
79072805 3217 break;
985213f2 3218 }
79072805 3219 case ':':
2d8e6c8d 3220 PL_chopset = SvPV_force(sv,len);
79072805 3221 break;
9cdac2a2
FC
3222 case '$': /* $$ */
3223 /* Store the pid in mg->mg_obj so we can tell when a fork has
3224 occurred. mg->mg_obj points to *$ by default, so clear it. */
3225 if (isGV(mg->mg_obj)) {
3226 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3227 SvREFCNT_dec(mg->mg_obj);
3228 mg->mg_flags |= MGf_REFCOUNTED;
3229 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3230 }
3231 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3232 break;
79072805 3233 case '0':
e2975953 3234 LOCK_DOLLARZERO_MUTEX;
f1540bed 3235 S_set_dollarzero(aTHX_ sv);
e2975953 3236 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3237 break;
3238 }
3239 return 0;
3240}
3241
3242I32
84c7b88c
BF
3243Perl_whichsig_sv(pTHX_ SV *sigsv)
3244{
3245 const char *sigpv;
3246 STRLEN siglen;
3247 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3248 sigpv = SvPV_const(sigsv, siglen);
3249 return whichsig_pvn(sigpv, siglen);
3250}
3251
3252I32
3253Perl_whichsig_pv(pTHX_ const char *sig)
3254{
3255 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3256 return whichsig_pvn(sig, strlen(sig));
3257}
3258
3259I32
3260Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3261{
eb578fdb 3262 char* const* sigv;
7918f24d 3263
84c7b88c 3264 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3265 PERL_UNUSED_CONTEXT;
79072805 3266
aadb217d 3267 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3268 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3269 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3270#ifdef SIGCLD
84c7b88c 3271 if (memEQs(sig, len, "CHLD"))
79072805
LW
3272 return SIGCLD;
3273#endif
3274#ifdef SIGCHLD
84c7b88c 3275 if (memEQs(sig, len, "CLD"))
79072805
LW
3276 return SIGCHLD;
3277#endif
7f1236c0 3278 return -1;
79072805
LW
3279}
3280
ecfc5424 3281Signal_t
1e82f5a6 3282#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3283Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3284#else
3285Perl_sighandler(int sig)
3286#endif
79072805 3287{
1018e26f
NIS
3288#ifdef PERL_GET_SIG_CONTEXT
3289 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3290#else
cea2e8a9 3291 dTHX;
71d280e3 3292#endif
79072805 3293 dSP;
a0714e2c
SS
3294 GV *gv = NULL;
3295 SV *sv = NULL;
8772537c 3296 SV * const tSv = PL_Sv;
601f1833 3297 CV *cv = NULL;
533c011a 3298 OP *myop = PL_op;
84902520 3299 U32 flags = 0;
8772537c 3300 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3301 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3302 SV *errsv_save = NULL;
71d280e3 3303
84902520 3304
727405f8 3305 if (!PL_psig_ptr[sig]) {
99ef548b 3306 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3307 PL_sig_name[sig]);
3308 exit(sig);
3309 }
ff0cee69 3310
a0d63a7b
DM
3311 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3312 /* Max number of items pushed there is 3*n or 4. We cannot fix
3313 infinity, so we fix 4 (in fact 5): */
3314 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3315 flags |= 1;
3316 PL_savestack_ix += 5; /* Protect save in progress. */
3317 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3318 }
84902520 3319 }
84902520 3320 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3321 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3322 || SvTYPE(cv) != SVt_PVCV) {
3323 HV *st;
f2c0649b 3324 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3325 }
84902520 3326
a0d0e21e 3327 if (!cv || !CvROOT(cv)) {
07c325bb 3328 const HEK * const hek = gv
1d6bb9ae
FC
3329 ? GvENAME_HEK(gv)
3330 : cv && CvNAMED(cv)
3331 ? CvNAME_HEK(cv)
07c325bb
FC
3332 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3333 if (hek)
3334 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3335 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3336 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3337 /* diag_listed_as: SIG%s handler "%s" not defined */
3338 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3339 "SIG%s handler \"__ANON__\" not defined.\n",
3340 PL_sig_name[sig]);
00d579c5 3341 goto cleanup;
79072805
LW
3342 }
3343
0c4d3b5e
DM
3344 sv = PL_psig_name[sig]
3345 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3346 : newSVpv(PL_sig_name[sig],0);
72048cfe 3347 flags |= 8;
0c4d3b5e
DM
3348 SAVEFREESV(sv);
3349
a0d63a7b
DM
3350 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3351 /* make sure our assumption about the size of the SAVEs are correct:
3352 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3353 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3354 }
e336de0d 3355
e788e7d3 3356 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3357 PUSHMARK(SP);
79072805 3358 PUSHs(sv);
8aad04aa
JH
3359#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3360 {
3361 struct sigaction oact;
3362
3363 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3364 if (sip) {
3365 HV *sih = newHV();
ad64d0ec 3366 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3367 /* The siginfo fields signo, code, errno, pid, uid,
3368 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3369 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3370 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3371#ifdef HAS_SIGINFO_SI_ERRNO
3372 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3373#endif
3374#ifdef HAS_SIGINFO_SI_STATUS
3375 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3376#endif
3377#ifdef HAS_SIGINFO_SI_UID
3378 {
3379 SV *uid = newSV(0);
3380 sv_setuid(uid, sip->si_uid);
3381 (void)hv_stores(sih, "uid", uid);
3382 }
3383#endif
3384#ifdef HAS_SIGINFO_SI_PID
3385 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3386#endif
3387#ifdef HAS_SIGINFO_SI_ADDR
3388 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3389#endif
3390#ifdef HAS_SIGINFO_SI_BAND
3391 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3392#endif
8aad04aa 3393 EXTEND(SP, 2);
ad64d0ec 3394 PUSHs(rv);
22f1178f 3395 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3396 }
b4552a27 3397
8aad04aa
JH
3398 }
3399 }
3400#endif
79072805 3401 PUTBACK;
a0d0e21e 3402
100c03aa
JL
3403 errsv_save = newSVsv(ERRSV);
3404
ad64d0ec 3405 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3406
d3acc0f7 3407 POPSTACK;
eed484f9
DD
3408 {
3409 SV * const errsv = ERRSV;
3410 if (SvTRUE_NN(errsv)) {
3411 SvREFCNT_dec(errsv_save);
c22d665b 3412#ifndef PERL_MICRO
1b266415
NIS
3413 /* Handler "died", for example to get out of a restart-able read().
3414 * Before we re-do that on its behalf re-enable the signal which was
3415 * blocked by the system when we entered.
3416 */
c22d665b 3417#ifdef HAS_SIGPROCMASK
d488af49 3418#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3419 if (sip || uap)
c22d665b 3420#endif
eed484f9
DD
3421 {
3422 sigset_t set;
3423 sigemptyset(&set);
3424 sigaddset(&set,sig);
3425 sigprocmask(SIG_UNBLOCK, &set, NULL);
3426 }
c22d665b 3427#else
eed484f9
DD
3428 /* Not clear if this will work */
3429 (void)rsignal(sig, SIG_IGN);
3430 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3431#endif
3432#endif /* !PERL_MICRO */
eed484f9
DD
3433 die_sv(errsv);
3434 }
3435 else {
3436 sv_setsv(errsv, errsv_save);
3437 SvREFCNT_dec(errsv_save);
3438 }
100c03aa
JL
3439 }
3440
7b52d656 3441 cleanup:
0c4d3b5e
DM
3442 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3443 PL_savestack_ix = old_ss_ix;
72048cfe 3444 if (flags & 8)
2357bae7 3445 SvREFCNT_dec_NN(sv);
533c011a 3446 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3447
3280af22
NIS
3448 PL_Sv = tSv; /* Restore global temporaries. */
3449 PL_Xpv = tXpv;
53bb94e2 3450 return;
79072805 3451}
4e35701f
NIS
3452
3453
51371543 3454static void
8772537c 3455S_restore_magic(pTHX_ const void *p)
51371543 3456{
8772537c
AL
3457 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3458 SV* const sv = mgs->mgs_sv;
150b625d 3459 bool bumped;
51371543
GS
3460
3461 if (!sv)
3462 return;
3463
4bac9ae4
CS
3464 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3465 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC
3466 if (mgs->mgs_flags)
3467 SvFLAGS(sv) |= mgs->mgs_flags;