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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 826 * error message text, so do an additional check. */
027a0d26
KW
827 if ( ! IN_BYTES /* respect 'use bytes' */
828 && is_utf8_non_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
a8f4b0c6
KW
829
830#ifdef USE_LOCALE_MESSAGES
831
61520eee 832 && _is_cur_LC_category_utf8(LC_MESSAGES)
a8f4b0c6
KW
833
834#endif
835
836 ) {
d3c0b317
KW
837 SvUTF8_on(sv);
838 }
b35e4f8b 839 }
d9fe7d23
KW
840}
841
658db622
Z
842/*
843=for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
844
845Generates the message string describing an OS error and returns it as
846an SV. C<errnum> must be a value that C<errno> could take, identifying
847the type of error.
848
849If C<tgtsv> is non-null then the string will be written into that SV
850(overwriting existing content) and it will be returned. If C<tgtsv>
851is a null pointer then the string will be written into a new mortal SV
852which will be returned.
853
854The message will be taken from whatever locale would be used by C<$!>,
855and will be encoded in the SV in whatever manner would be used by C<$!>.
856The details of this process are subject to future change. Currently,
857the message is taken from the C locale by default (usually producing an
858English message), and from the currently selected locale when in the scope
859of the C<use locale> pragma. A heuristic attempt is made to decode the
860message from the locale's character encoding, but it will only be decoded
861as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
862locale, usually in an ISO-8859-1 locale, and never in any other locale.
863
864The SV is always returned containing an actual string, and with no other
865OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
866(meaning success), and if no useful message is available then a useless
867string (currently empty) is returned.
868
869=cut
870*/
871
872SV *
873Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
874{
875 char const *errstr;
876 if(!tgtsv)
877 tgtsv = sv_newmortal();
878 errstr = my_strerror(errnum);
879 if(errstr) {
880 sv_setpv(tgtsv, errstr);
881 fixup_errno_string(tgtsv);
882 } else {
883 SvPVCLEAR(tgtsv);
884 }
885 return tgtsv;
886}
887
25bbd826
CB
888#ifdef VMS
889#include <descrip.h>
890#include <starlet.h>
891#endif
892
79072805 893int
864dbfa3 894Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 895{
eb578fdb
KW
896 I32 paren;
897 const char *s = NULL;
898 REGEXP *rx;
823a54a3 899 const char * const remaining = mg->mg_ptr + 1;
e91d8259 900 char nextchar;
79072805 901
7918f24d
NC
902 PERL_ARGS_ASSERT_MAGIC_GET;
903
e91d8259 904 if (!mg->mg_ptr) {
e91d8259 905 paren = mg->mg_len;
e91d8259 906 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 907 do_numbuf_fetch:
e91d8259 908 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 909 }
e03e82a0
DM
910 else
911 goto set_undef;
e91d8259
NC
912 return 0;
913 }
914
915 nextchar = *remaining;
79072805 916 switch (*mg->mg_ptr) {
748a9306 917 case '\001': /* ^A */
f2da823f 918 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
919 else
920 sv_set_undef(sv);
125b9982
NT
921 if (SvTAINTED(PL_bodytarget))
922 SvTAINTED_on(sv);
748a9306 923 break;
e5218da5 924 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 925 if (nextchar == '\0') {
e5218da5
GA
926 sv_setiv(sv, (IV)PL_minus_c);
927 }
823a54a3 928 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
929 sv_setiv(sv, (IV)STATUS_NATIVE);
930 }
49460fe6
NIS
931 break;
932
79072805 933 case '\004': /* ^D */
aea4f609 934 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 935 break;
28f23441 936 case '\005': /* ^E */
6c6eab55
KW
937 if (nextchar != '\0') {
938 if (strEQ(remaining, "NCODING"))
3773545d 939 sv_set_undef(sv);
4f4ff3a7 940 break;
6c6eab55 941 }
4f4ff3a7
KW
942
943#if defined(VMS) || defined(OS2) || defined(WIN32)
944# if defined(VMS)
2a99ff86
KW
945 {
946 char msg[255];
947 $DESCRIPTOR(msgdsc,msg);
948 sv_setnv(sv,(NV) vaxc$errno);
949 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
950 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
951 else
b2aed775 952 SvPVCLEAR(sv);
2a99ff86 953 }
4b645107 954#elif defined(OS2)
2a99ff86
KW
955 if (!(_emx_env & 0x200)) { /* Under DOS */
956 sv_setnv(sv, (NV)errno);
2c6ee1a7 957 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
958 } else {
959 if (errno != errno_isOS2) {
960 const int tmp = _syserrno();
961 if (tmp) /* 2nd call to _syserrno() makes it 0 */
962 Perl_rc = tmp;
963 }
964 sv_setnv(sv, (NV)Perl_rc);
965 sv_setpv(sv, os2error(Perl_rc));
966 }
1534c6f5 967 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
968 fixup_errno_string(sv);
969 }
4f4ff3a7 970# elif defined(WIN32)
2a99ff86
KW
971 {
972 const DWORD dwErr = GetLastError();
973 sv_setnv(sv, (NV)dwErr);
974 if (dwErr) {
975 PerlProc_GetOSError(sv, dwErr);
2efab60d 976 fixup_errno_string(sv);
2a99ff86
KW
977 }
978 else
b2aed775 979 SvPVCLEAR(sv);
2a99ff86
KW
980 SetLastError(dwErr);
981 }
4f4ff3a7
KW
982# else
983# error Missing code for platform
984# endif
2a99ff86
KW
985 SvRTRIM(sv);
986 SvNOK_on(sv); /* what a wonderful hack! */
987 break;
4f4ff3a7
KW
988#endif /* End of platforms with special handling for $^E; others just fall
989 through to $! */
2165bd23 990 /* FALLTHROUGH */
46f3e16c
KW
991
992 case '!':
993 {
5f1b979d 994 dSAVE_ERRNO;
46f3e16c 995#ifdef VMS
5f1b979d 996 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 997#else
5f1b979d 998 sv_setnv(sv, (NV)errno);
46f3e16c
KW
999#endif
1000#ifdef OS2
5f1b979d
KW
1001 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1002 sv_setpv(sv, os2error(Perl_rc));
1003 else
46f3e16c 1004#endif
5f1b979d 1005 if (! errno) {
b2aed775 1006 SvPVCLEAR(sv);
46f3e16c 1007 }
5f1b979d 1008 else {
658db622
Z
1009 sv_string_from_errnum(errno, sv);
1010 /* If no useful string is available, don't
1011 * claim to have a string part. The SvNOK_on()
5f1b979d 1012 * below will cause just the number part to be valid */
658db622
Z
1013 if (!SvCUR(sv))
1014 SvPOK_off(sv);
5f1b979d
KW
1015 }
1016 RESTORE_ERRNO;
46f3e16c
KW
1017 }
1018
1019 SvRTRIM(sv);
1020 SvNOK_on(sv); /* what a wonderful hack! */
1021 break;
1022
79072805 1023 case '\006': /* ^F */
3280af22 1024 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 1025 break;
9ebf26ad
FR
1026 case '\007': /* ^GLOBAL_PHASE */
1027 if (strEQ(remaining, "LOBAL_PHASE")) {
1028 sv_setpvn(sv, PL_phase_names[PL_phase],
1029 strlen(PL_phase_names[PL_phase]));
1030 }
1031 break;
a0d0e21e 1032 case '\010': /* ^H */
5d382c25 1033 sv_setuv(sv, PL_hints);
a0d0e21e 1034 break;
9d116dd7 1035 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1036 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1037 break;
8561ea1d
FC
1038 case '\014': /* ^LAST_FH */
1039 if (strEQ(remaining, "AST_FH")) {
745e740c 1040 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1041 assert(isGV_with_GP(PL_last_in_gv));
1042 SV_CHECK_THINKFIRST_COW_DROP(sv);
1043 prepare_SV_for_RV(sv);
1044 SvOK_off(sv);
1045 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1046 SvROK_on(sv);
1047 sv_rvweaken(sv);
1048 }
3773545d
DM
1049 else
1050 sv_set_undef(sv);
8561ea1d
FC
1051 }
1052 break;
ac27b0f5 1053 case '\017': /* ^O & ^OPEN */
823a54a3 1054 if (nextchar == '\0') {
ac27b0f5 1055 sv_setpv(sv, PL_osname);
3511154c
DM
1056 SvTAINTED_off(sv);
1057 }
823a54a3 1058 else if (strEQ(remaining, "PEN")) {
8b850bd5 1059 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1060 }
28f23441 1061 break;
9ebf26ad 1062 case '\020':
a6d0b1b5 1063 sv_setiv(sv, (IV)PL_perldb);
79072805 1064 break;
fb73857a 1065 case '\023': /* ^S */
a6d0b1b5 1066 {
bc177e6b 1067 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1068 SvOK_off(sv);
3280af22 1069 else if (PL_in_eval)
6dc8a9e4 1070 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1071 else
1072 sv_setiv(sv, 0);
d58bf5aa 1073 }
fb73857a 1074 break;
79072805 1075 case '\024': /* ^T */
823a54a3 1076 if (nextchar == '\0') {
88e89b8a 1077#ifdef BIG_TIME
7c36658b 1078 sv_setnv(sv, PL_basetime);
88e89b8a 1079#else
7c36658b 1080 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1081#endif
7c36658b 1082 }
823a54a3 1083 else if (strEQ(remaining, "AINT"))
284167a5
SM
1084 sv_setiv(sv, TAINTING_get
1085 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1086 : 0);
7c36658b 1087 break;
e07ea26a 1088 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1089 if (strEQ(remaining, "NICODE"))
a05d7ebb 1090 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1091 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1092 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1093 else if (strEQ(remaining, "TF8CACHE"))
1094 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1095 break;
1096 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1097 if (nextchar == '\0')
8298454c 1098 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1099 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1100 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1101 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1102 }
1103 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1104 goto set_undef;
013b78e8 1105 }
d3a7d8c7 1106 else if (PL_compiling.cop_warnings == pWARN_ALL) {
006c1a1d 1107 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1108 }
4438c4b7 1109 else {
72dc9ed5
NC
1110 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1111 *PL_compiling.cop_warnings);
ac27b0f5 1112 }
4438c4b7 1113 }
8ca2a5d6
DD
1114#ifdef WIN32
1115 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1116 sv_setiv(sv, w32_sloppystat);
1117 }
1118#endif
79072805 1119 break;
79072805 1120 case '+':
aaa362c4 1121 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1122 paren = RX_LASTPAREN(rx);
1123 if (paren)
1124 goto do_numbuf_fetch;
79072805 1125 }
e03e82a0 1126 goto set_undef;
a01268b5
JH
1127 case '\016': /* ^N */
1128 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1129 paren = RX_LASTCLOSEPAREN(rx);
1130 if (paren)
1131 goto do_numbuf_fetch;
a01268b5 1132 }
e03e82a0 1133 goto set_undef;
79072805 1134 case '.':
3280af22 1135 if (GvIO(PL_last_in_gv)) {
357c8808 1136 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1137 }
79072805
LW
1138 break;
1139 case '?':
809a5acc 1140 {
809a5acc 1141 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1142#ifdef COMPLEX_STATUS
41cb7b2b 1143 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1144 LvTARGOFF(sv) = PL_statusvalue;
1145 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1146#endif
809a5acc 1147 }
79072805
LW
1148 break;
1149 case '^':
acbe1b9d 1150 if (GvIOp(PL_defoutgv))
099be4f1 1151 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1152 if (s)
1153 sv_setpv(sv,s);
1154 else {
3280af22 1155 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1156 sv_catpvs(sv,"_TOP");
79072805
LW
1157 }
1158 break;
1159 case '~':
acbe1b9d 1160 if (GvIOp(PL_defoutgv))
0daa599b 1161 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1162 if (!s)
3280af22 1163 s = GvENAME(PL_defoutgv);
79072805
LW
1164 sv_setpv(sv,s);
1165 break;
79072805 1166 case '=':
099be4f1 1167 if (GvIO(PL_defoutgv))
0daa599b 1168 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1169 break;
1170 case '-':
099be4f1 1171 if (GvIO(PL_defoutgv))
0daa599b 1172 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1173 break;
1174 case '%':
099be4f1 1175 if (GvIO(PL_defoutgv))
0daa599b 1176 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1177 break;
79072805 1178 case ':':
79072805
LW
1179 case '/':
1180 break;
1181 case '[':
e1dccc0d 1182 sv_setiv(sv, 0);
79072805
LW
1183 break;
1184 case '|':
099be4f1 1185 if (GvIO(PL_defoutgv))
0daa599b 1186 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1187 break;
79072805 1188 case '\\':
b2ce0fda 1189 if (PL_ors_sv)
f28098ff 1190 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1191 else
e03e82a0 1192 goto set_undef;
79072805 1193 break;
0e219455 1194 case '$': /* $$ */
9cdac2a2
FC
1195 {
1196 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1197 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1198 /* never set manually, or at least not since last fork */
1199 sv_setiv(sv, pid);
19db9fb7
Z
1200 /* never unsafe, even if reading in a tainted expression */
1201 SvTAINTED_off(sv);
1202 }
9cdac2a2
FC
1203 /* else a value has been assigned manually, so do nothing */
1204 }
0e219455 1205 break;
79072805 1206 case '<':
dfff4baf 1207 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1208 break;
1209 case '>':
dfff4baf 1210 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1211 break;
1212 case '(':
dfff4baf 1213 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1214 goto add_groups;
1215 case ')':
dfff4baf 1216 sv_setgid(sv, PerlProc_getegid());
79072805 1217 add_groups:
79072805 1218#ifdef HAS_GETGROUPS
79072805 1219 {
57d7c65e 1220 Groups_t *gary = NULL;
375ed12a
JH
1221 I32 num_groups = getgroups(0, gary);
1222 if (num_groups > 0) {
19742f39 1223 I32 i;
375ed12a
JH
1224 Newx(gary, num_groups, Groups_t);
1225 num_groups = getgroups(num_groups, gary);
1226 for (i = 0; i < num_groups; i++)
147e3846 1227 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1228 Safefree(gary);
1229 }
79072805 1230 }
155aba94 1231 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1232#endif
79072805 1233 break;
79072805
LW
1234 case '0':
1235 break;
1236 }
a0d0e21e 1237 return 0;
e03e82a0
DM
1238
1239 set_undef:
1240 sv_set_undef(sv);
1241 return 0;
79072805
LW
1242}
1243
1244int
864dbfa3 1245Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1246{
8772537c 1247 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1248
7918f24d
NC
1249 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1250
79072805 1251 if (uf && uf->uf_val)
24f81a43 1252 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1253 return 0;
1254}
1255
1256int
864dbfa3 1257Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1258{
9ae3433d 1259 STRLEN len = 0, klen;
12033064 1260 const char * const key = MgPV_const(mg,klen);
888a67f6 1261 const char *s = "";
1e422769 1262
7918f24d
NC
1263 PERL_ARGS_ASSERT_MAGIC_SETENV;
1264
613c63b4 1265 SvGETMAGIC(sv);
12033064 1266 if (SvOK(sv)) {
613c63b4
CS
1267 /* defined environment variables are byte strings; unfortunately
1268 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1269 (void)SvPV_force_nomg_nolen(sv);
1270 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1271 if (SvUTF8(sv)) {
1272 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1273 SvUTF8_off(sv);
1274 }
1275 s = SvPVX(sv);
1276 len = SvCUR(sv);
12033064
CS
1277 }
1278 my_setenv(key, s); /* does the deed */
1279
a0d0e21e
LW
1280#ifdef DYNAMIC_ENV_FETCH
1281 /* We just undefd an environment var. Is a replacement */
1282 /* waiting in the wings? */
1283 if (!len) {
6bd66ee9 1284 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1285 if (valp)
4ab59fcc 1286 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1287 }
1288#endif
1e422769 1289
28542d8f 1290#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1291 /* And you'll never guess what the dog had */
1292 /* in its mouth... */
284167a5 1293 if (TAINTING_get) {
1e422769
PP
1294 MgTAINTEDDIR_off(mg);
1295#ifdef VMS
b2aed775 1296 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1297 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1298 int i = 0, j = 0;
1299
6fca0082 1300 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1301 elt = eltbuf;
1e422769
PP
1302 do { /* DCL$PATH may be a search list */
1303 while (1) { /* as may dev portion of any element */
1304 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1305 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1306 cando_by_name(S_IWUSR,0,elt) ) {
1307 MgTAINTEDDIR_on(mg);
1308 return 0;
1309 }
1310 }
bd61b366 1311 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1312 *cp = '\0';
1313 if (my_trnlnm(elt, eltbuf, j++))
1314 elt = eltbuf;
1315 else
1316 break;
1317 }
1318 j = 0;
1319 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1320 }
1321#endif /* VMS */
b2aed775 1322 if (s && memEQs(key, klen, "PATH")) {
8772537c 1323 const char * const strend = s + len;
463ee0b2 1324
70b484a8
DM
1325 /* set MGf_TAINTEDDIR if any component of the new path is
1326 * relative or world-writeable */
463ee0b2 1327 while (s < strend) {
96827780 1328 char tmpbuf[256];
c623ac67 1329 Stat_t st;
5f74f29c 1330 I32 i;
83269ced
CB
1331#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1332 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1333#else
1334 const char path_sep = ':';
1335#endif
ba0a4150 1336 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1337 s, strend, path_sep, &i);
463ee0b2 1338 s++;
bb7a0f54 1339 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1340#ifdef __VMS
1341 /* no colon thus no device name -- assume relative path */
1342 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1343 /* Using Unix separator, e.g. under bash, so act line Unix */
1344 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1345#else
1346 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1347#endif
c6ed36e1 1348 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1349 MgTAINTEDDIR_on(mg);
1e422769
PP
1350 return 0;
1351 }
463ee0b2 1352 }
79072805
LW
1353 }
1354 }
28542d8f 1355#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1356
79072805
LW
1357 return 0;
1358}
1359
1360int
864dbfa3 1361Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1362{
7918f24d 1363 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1364 PERL_UNUSED_ARG(sv);
bd61b366 1365 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1366 return 0;
1367}
1368
88e89b8a 1369int
864dbfa3 1370Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1371{
7918f24d 1372 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1373 PERL_UNUSED_ARG(mg);
b0269e46 1374#if defined(VMS)
cea2e8a9 1375 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1376#else
3280af22 1377 if (PL_localizing) {
fb73857a 1378 HE* entry;
b0269e46 1379 my_clearenv();
85fbaab2
NC
1380 hv_iterinit(MUTABLE_HV(sv));
1381 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1382 I32 keylen;
1383 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1384 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1385 }
1386 }
1387#endif
1388 return 0;
1389}
1390
1391int
864dbfa3 1392Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1393{
7918f24d 1394 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1395 PERL_UNUSED_ARG(sv);
1396 PERL_UNUSED_ARG(mg);
b0269e46
AB
1397#if defined(VMS)
1398 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1399#else
1400 my_clearenv();
1401#endif
3e3baf6d 1402 return 0;
66b1d557
HM
1403}
1404
64ca3a65 1405#ifndef PERL_MICRO
2d4fcd5e
AJ
1406#ifdef HAS_SIGPROCMASK
1407static void
1408restore_sigmask(pTHX_ SV *save_sv)
1409{
0bd48802 1410 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1411 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1412}
1413#endif
66b1d557 1414int
864dbfa3 1415Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1416{
88e89b8a 1417 /* Are we fetching a signal entry? */
708854f2 1418 int i = (I16)mg->mg_private;
7918f24d
NC
1419
1420 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1421
708854f2 1422 if (!i) {
84c7b88c
BF
1423 STRLEN siglen;
1424 const char * sig = MgPV_const(mg, siglen);
1425 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1426 }
1427
e02bfb16 1428 if (i > 0) {
22c35a8c
GS
1429 if(PL_psig_ptr[i])
1430 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1431 else {
46da273f 1432 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1433#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1434 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1435 sigstate = SIG_IGN;
2e34cc90
CL
1436#endif
1437#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1438 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1439 sigstate = SIG_DFL;
85b332e2 1440#endif
88e89b8a 1441 /* cache state so we don't fetch it again */
8aad04aa 1442 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1443 sv_setpvs(sv,"IGNORE");
88e89b8a 1444 else
e03e82a0 1445 sv_set_undef(sv);
46da273f 1446 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1447 SvTEMP_off(sv);
1448 }
1449 }
1450 return 0;
1451}
1452int
864dbfa3 1453Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1454{
7918f24d 1455 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1456
38a124f0 1457 magic_setsig(NULL, mg);
179c85a2 1458 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1459}
3d37d572 1460
0a8e0eff 1461Signal_t
8aad04aa 1462#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1463Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1464#else
0a8e0eff 1465Perl_csighandler(int sig)
8aad04aa 1466#endif
0a8e0eff 1467{
1018e26f
NIS
1468#ifdef PERL_GET_SIG_CONTEXT
1469 dTHXa(PERL_GET_SIG_CONTEXT);
1470#else
85b332e2
CL
1471 dTHX;
1472#endif
1271a1be 1473#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1474#if defined(__cplusplus) && defined(__GNUC__)
1475 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1476 * parameters would be warned about. */
1477 PERL_UNUSED_ARG(sip);
1478 PERL_UNUSED_ARG(uap);
1479#endif
1271a1be 1480#endif
23ada85b 1481#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1482 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1483 if (PL_sig_ignoring[sig]) return;
85b332e2 1484#endif
2e34cc90 1485#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1486 if (PL_sig_defaulting[sig])
2e34cc90
CL
1487#ifdef KILL_BY_SIGPRC
1488 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1489#else
1490 exit(1);
1491#endif
1492#endif
406878dd 1493 if (
853d2c32
RGS
1494#ifdef SIGILL
1495 sig == SIGILL ||
1496#endif
1497#ifdef SIGBUS
1498 sig == SIGBUS ||
1499#endif
1500#ifdef SIGSEGV
1501 sig == SIGSEGV ||
1502#endif
1503 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1504 /* Call the perl level handler now--
31c91b43 1505 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1506#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1507 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1508#else
1509 (*PL_sighandlerp)(sig);
92807b6d 1510#endif
406878dd 1511 else {
31c91b43 1512 if (!PL_psig_pend) return;
406878dd
GA
1513 /* Set a flag to say this signal is pending, that is awaiting delivery after
1514 * the current Perl opcode completes */
1515 PL_psig_pend[sig]++;
1516
1517#ifndef SIG_PENDING_DIE_COUNT
1518# define SIG_PENDING_DIE_COUNT 120
1519#endif
fe13d51d 1520 /* Add one to say _a_ signal is pending */
406878dd
GA
1521 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1522 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1523 (unsigned long)SIG_PENDING_DIE_COUNT);
1524 }
0a8e0eff
NIS
1525}
1526
2e34cc90
CL
1527#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1528void
1529Perl_csighandler_init(void)
1530{
1531 int sig;
27da23d5 1532 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1533
1534 for (sig = 1; sig < SIG_SIZE; sig++) {
1535#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1536 dTHX;
27da23d5 1537 PL_sig_defaulting[sig] = 1;
5c1546dc 1538 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1539#endif
1540#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1541 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1542#endif
1543 }
27da23d5 1544 PL_sig_handlers_initted = 1;
2e34cc90
CL
1545}
1546#endif
1547
7fe50b8b
LT
1548#if defined HAS_SIGPROCMASK
1549static void
1550unblock_sigmask(pTHX_ void* newset)
1551{
dc3bf405 1552 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1553 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1554}
1555#endif
1556
0a8e0eff
NIS
1557void
1558Perl_despatch_signals(pTHX)
1559{
1560 int sig;
1561 PL_sig_pending = 0;
1562 for (sig = 1; sig < SIG_SIZE; sig++) {
1563 if (PL_psig_pend[sig]) {
d0166017 1564 dSAVE_ERRNO;
7fe50b8b 1565#ifdef HAS_SIGPROCMASK
55534442
LT
1566 /* From sigaction(2) (FreeBSD man page):
1567 * | Signal routines normally execute with the signal that
1568 * | caused their invocation blocked, but other signals may
1569 * | yet occur.
1570 * Emulation of this behavior (from within Perl) is enabled
1571 * using sigprocmask
1572 */
1573 int was_blocked;
1574 sigset_t newset, oldset;
1575
1576 sigemptyset(&newset);
1577 sigaddset(&newset, sig);
1578 sigprocmask(SIG_BLOCK, &newset, &oldset);
1579 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1580 if (!was_blocked) {
1581 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1582 ENTER;
1583 SAVEFREESV(save_sv);
1584 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1585 }
55534442 1586#endif
25da4428 1587 PL_psig_pend[sig] = 0;
6e324d09 1588#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1589 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1590#else
1591 (*PL_sighandlerp)(sig);
92807b6d 1592#endif
7fe50b8b 1593#ifdef HAS_SIGPROCMASK
55534442 1594 if (!was_blocked)
7fe50b8b 1595 LEAVE;
55534442 1596#endif
d0166017 1597 RESTORE_ERRNO;
0a8e0eff
NIS
1598 }
1599 }
1600}
1601
38a124f0 1602/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1603int
864dbfa3 1604Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1605{
27da23d5 1606 dVAR;
79072805 1607 I32 i;
cbbf8932 1608 SV** svp = NULL;
2d4fcd5e
AJ
1609 /* Need to be careful with SvREFCNT_dec(), because that can have side
1610 * effects (due to closures). We must make sure that the new disposition
1611 * is in place before it is called.
1612 */
cbbf8932 1613 SV* to_dec = NULL;
e72dc28c 1614 STRLEN len;
2d4fcd5e
AJ
1615#ifdef HAS_SIGPROCMASK
1616 sigset_t set, save;
1617 SV* save_sv;
1618#endif
eb578fdb 1619 const char *s = MgPV_const(mg,len);
7918f24d
NC
1620
1621 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1622
748a9306 1623 if (*s == '_') {
84c7b88c 1624 if (memEQs(s, len, "__DIE__"))
3280af22 1625 svp = &PL_diehook;
84c7b88c 1626 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1627 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1628 /* Merge the existing behaviours, which are as follows:
1629 magic_setsig, we always set svp to &PL_warnhook
1630 (hence we always change the warnings handler)
1631 For magic_clearsig, we don't change the warnings handler if it's
1632 set to the &PL_warnhook. */
3280af22 1633 svp = &PL_warnhook;
84c7b88c
BF
1634 } else if (sv) {
1635 SV *tmp = sv_newmortal();
1636 Perl_croak(aTHX_ "No such hook: %s",
1637 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1638 }
748a9306 1639 i = 0;
38a124f0 1640 if (svp && *svp) {
9289f461
RGS
1641 if (*svp != PERL_WARNHOOK_FATAL)
1642 to_dec = *svp;
cbbf8932 1643 *svp = NULL;
4633a7c4 1644 }
748a9306
LW
1645 }
1646 else {
708854f2
NC
1647 i = (I16)mg->mg_private;
1648 if (!i) {
84c7b88c 1649 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1650 mg->mg_private = (U16)i;
708854f2 1651 }
86d86cad 1652 if (i <= 0) {
84c7b88c
BF
1653 if (sv) {
1654 SV *tmp = sv_newmortal();
1655 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1656 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1657 }
748a9306
LW
1658 return 0;
1659 }
2d4fcd5e
AJ
1660#ifdef HAS_SIGPROCMASK
1661 /* Avoid having the signal arrive at a bad time, if possible. */
1662 sigemptyset(&set);
1663 sigaddset(&set,i);
1664 sigprocmask(SIG_BLOCK, &set, &save);
1665 ENTER;
9ff8e806 1666 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1667 SAVEFREESV(save_sv);
1668 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1669#endif
1670 PERL_ASYNC_CHECK();
2e34cc90 1671#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1672 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1673#endif
23ada85b 1674#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1675 PL_sig_ignoring[i] = 0;
85b332e2 1676#endif
2e34cc90 1677#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1678 PL_sig_defaulting[i] = 0;
2e34cc90 1679#endif
2d4fcd5e 1680 to_dec = PL_psig_ptr[i];
38a124f0
NC
1681 if (sv) {
1682 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1683 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1684
1685 /* Signals don't change name during the program's execution, so once
1686 they're cached in the appropriate slot of PL_psig_name, they can
1687 stay there.
1688
1689 Ideally we'd find some way of making SVs at (C) compile time, or
1690 at least, doing most of the work. */
1691 if (!PL_psig_name[i]) {
1692 PL_psig_name[i] = newSVpvn(s, len);
1693 SvREADONLY_on(PL_psig_name[i]);
1694 }
38a124f0 1695 } else {
79fd3822 1696 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1697 PL_psig_name[i] = NULL;
1698 PL_psig_ptr[i] = NULL;
1699 }
748a9306 1700 }
38a124f0 1701 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1702 if (i) {
5c1546dc 1703 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1704 }
748a9306 1705 else
b37c2d43 1706 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1707 } else {
9dfa190b
NC
1708 if (sv && SvOK(sv)) {
1709 s = SvPV_force(sv, len);
1710 } else {
1711 sv = NULL;
1712 }
84c7b88c 1713 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1714 if (i) {
23ada85b 1715#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1716 PL_sig_ignoring[i] = 1;
1717 (void)rsignal(i, PL_csighandlerp);
85b332e2 1718#else
9dfa190b 1719 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1720#endif
9dfa190b 1721 }
2d4fcd5e 1722 }
84c7b88c 1723 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1724 if (i) {
2e34cc90 1725#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1726 PL_sig_defaulting[i] = 1;
1727 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1728#else
9dfa190b 1729 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1730#endif
9dfa190b
NC
1731 }
1732 }
1733 else {
1734 /*
1735 * We should warn if HINT_STRICT_REFS, but without
1736 * access to a known hint bit in a known OP, we can't
1737 * tell whether HINT_STRICT_REFS is in force or not.
1738 */
0687887e 1739 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1740 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1741 SV_GMAGIC);
1742 if (i)
1743 (void)rsignal(i, PL_csighandlerp);
1744 else
1745 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1746 }
748a9306 1747 }
9dfa190b 1748
2d4fcd5e
AJ
1749#ifdef HAS_SIGPROCMASK
1750 if(i)
1751 LEAVE;
1752#endif
ef8d46e8 1753 SvREFCNT_dec(to_dec);
79072805
LW
1754 return 0;
1755}
64ca3a65 1756#endif /* !PERL_MICRO */
79072805
LW
1757
1758int
864dbfa3 1759Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1760{
7918f24d 1761 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1762 PERL_UNUSED_ARG(sv);
e1a479c5 1763
89c14e2e 1764 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1765 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1766 return 0;
1767
0e446081 1768 return magic_clearisa(NULL, mg);
463ee0b2
LW
1769}
1770
0e446081 1771/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1772int
52b45067
RD
1773Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1774{
52b45067 1775 HV* stash;
7918f24d
NC
1776 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1777
52b45067 1778 /* Bail out if destruction is going on */
627364f1 1779 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1780
0e446081
NC
1781 if (sv)
1782 av_clear(MUTABLE_AV(sv));
52b45067 1783
6624142a
FC
1784 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1785 /* This occurs with setisa_elem magic, which calls this
1786 same function. */
1787 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1788
316ebaf2 1789 assert(mg);
6624142a
FC
1790 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1791 SV **svp = AvARRAY((AV *)mg->mg_obj);
1792 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1793 while (items--) {
1794 stash = GvSTASH((GV *)*svp++);
1795 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1796 }
1797
1798 return 0;
1799 }
1800
52b45067 1801 stash = GvSTASH(
6624142a 1802 (const GV *)mg->mg_obj
52b45067
RD
1803 );
1804
00169e2c
FC
1805 /* The stash may have been detached from the symbol table, so check its
1806 name before doing anything. */
1807 if (stash && HvENAME_get(stash))
5562fa71 1808 mro_isa_changed_in(stash);
52b45067
RD
1809
1810 return 0;
1811}
1812
1813int
864dbfa3 1814Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1815{
85fbaab2 1816 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1817 I32 i = 0;
7918f24d
NC
1818
1819 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1820 PERL_UNUSED_ARG(mg);
7719e241 1821
6ff81951 1822 if (hv) {
497b47a8 1823 (void) hv_iterinit(hv);
ad64d0ec 1824 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1825 i = HvUSEDKEYS(hv);
497b47a8
JH
1826 else {
1827 while (hv_iternext(hv))
1828 i++;
1829 }
6ff81951
GS
1830 }
1831
1832 sv_setiv(sv, (IV)i);
1833 return 0;
1834}
1835
1836int
864dbfa3 1837Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1838{
7918f24d 1839 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1840 PERL_UNUSED_ARG(mg);
946ec16e 1841 if (LvTARG(sv)) {
85fbaab2 1842 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1843 }
1844 return 0;
ac27b0f5 1845}
946ec16e 1846
efaf3674
DM
1847/*
1848=for apidoc magic_methcall
1849
1850Invoke a magic method (like FETCH).
1851
2baee27b
FC
1852C<sv> and C<mg> are the tied thingy and the tie magic.
1853
1854C<meth> is the name of the method to call.
1855
1856C<argc> is the number of args (in addition to $self) to pass to the method.
1857
1858The C<flags> can be:
1859
1860 G_DISCARD invoke method with G_DISCARD flag and don't
1861 return a value
1862 G_UNDEF_FILL fill the stack with argc pointers to
1863 PL_sv_undef
1864
1865The arguments themselves are any values following the C<flags> argument.
efaf3674 1866
796b6530 1867Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1868
1869
1870=cut
1871*/
1872
1873SV*
36925d9e 1874Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1875 U32 argc, ...)
a0d0e21e
LW
1876{
1877 dSP;
efaf3674 1878 SV* ret = NULL;
463ee0b2 1879
7918f24d
NC
1880 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1881
efaf3674 1882 ENTER;
d1d7a15d
NC
1883
1884 if (flags & G_WRITING_TO_STDERR) {
1885 SAVETMPS;
1886
2782061f 1887 save_re_context();
d1d7a15d
NC
1888 SAVESPTR(PL_stderrgv);
1889 PL_stderrgv = NULL;
1890 }
1891
efaf3674 1892 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1893 PUSHMARK(SP);
efaf3674 1894
052a7c76
DM
1895 /* EXTEND() expects a signed argc; don't wrap when casting */
1896 assert(argc <= I32_MAX);
1897 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1898 PUSHs(SvTIED_obj(sv, mg));
1899 if (flags & G_UNDEF_FILL) {
1900 while (argc--) {
efaf3674 1901 PUSHs(&PL_sv_undef);
93965878 1902 }
67549bd2 1903 } else if (argc > 0) {
046b0c7d
NC
1904 va_list args;
1905 va_start(args, argc);
1906
1907 do {
1908 SV *const sv = va_arg(args, SV *);
1909 PUSHs(sv);
1910 } while (--argc);
1911
1912 va_end(args);
88e89b8a 1913 }
463ee0b2 1914 PUTBACK;
efaf3674 1915 if (flags & G_DISCARD) {
36925d9e 1916 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1917 }
1918 else {
36925d9e 1919 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1920 ret = *PL_stack_sp--;
1921 }
1922 POPSTACK;
d1d7a15d
NC
1923 if (flags & G_WRITING_TO_STDERR)
1924 FREETMPS;
efaf3674
DM
1925 LEAVE;
1926 return ret;
1927}
1928
efaf3674 1929/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1930
efaf3674 1931STATIC SV*
36925d9e 1932S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1933 int n, SV *val)
1934{
efaf3674
DM
1935 SV* arg1 = NULL;
1936
1937 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1938
1939 if (mg->mg_ptr) {
1940 if (mg->mg_len >= 0) {
db4b3a1d 1941 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1942 }
1943 else if (mg->mg_len == HEf_SVKEY)
1944 arg1 = MUTABLE_SV(mg->mg_ptr);
1945 }
1946 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1947 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1948 sv_2mortal(arg1);
1949 }
1950 if (!arg1) {
046b0c7d 1951 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1952 }
046b0c7d 1953 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1954}
1955
76e3520e 1956STATIC int
36925d9e 1957S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1958{
efaf3674 1959 SV* ret;
463ee0b2 1960
7918f24d
NC
1961 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1962
efaf3674
DM
1963 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1964 if (ret)
1965 sv_setsv(sv, ret);
a0d0e21e
LW
1966 return 0;
1967}
463ee0b2 1968
a0d0e21e 1969int
864dbfa3 1970Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1971{
7918f24d
NC
1972 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1973
fd69380d 1974 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1975 mg->mg_flags |= MGf_GSKIP;
36925d9e 1976 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1977 return 0;
1978}
1979
1980int
864dbfa3 1981Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1982{
b112cff9
DM
1983 MAGIC *tmg;
1984 SV *val;
7918f24d
NC
1985
1986 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1987
b112cff9
DM
1988 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1989 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1990 * public flags indicate its value based on copying from $val. Doing
1991 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1992 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1993 * wrong if $val happened to be tainted, as sv hasn't got magic
1994 * enabled, even though taint magic is in the chain. In which case,
1995 * fake up a temporary tainted value (this is easier than temporarily
1996 * re-enabling magic on sv). */
1997
284167a5 1998 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1999 && (tmg->mg_len & 1))
2000 {
2001 val = sv_mortalcopy(sv);
2002 SvTAINTED_on(val);
2003 }
2004 else
2005 val = sv;
2006
36925d9e 2007 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2008 return 0;
2009}
2010
2011int
864dbfa3 2012Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2013{
7918f24d
NC
2014 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2015
4c13be3f 2016 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2017 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2018}
463ee0b2 2019
93965878
NIS
2020
2021U32
864dbfa3 2022Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2023{
22846ab4 2024 I32 retval = 0;
efaf3674 2025 SV* retsv;
93965878 2026
7918f24d
NC
2027 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2028
36925d9e 2029 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2030 if (retsv) {
2031 retval = SvIV(retsv)-1;
22846ab4
AB
2032 if (retval < -1)
2033 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2034 }
22846ab4 2035 return (U32) retval;
93965878
NIS
2036}
2037
cea2e8a9
GS
2038int
2039Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2040{
7918f24d
NC
2041 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2042
36925d9e 2043 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2044 return 0;
2045}
2046
2047int
864dbfa3 2048Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2049{
efaf3674 2050 SV* ret;
463ee0b2 2051
7918f24d
NC
2052 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2053
36925d9e
RZ
2054 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2055 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2056 if (ret)
2057 sv_setsv(key,ret);
79072805
LW
2058 return 0;
2059}
2060
2061int
1146e912 2062Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2063{
7918f24d
NC
2064 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2065
36925d9e 2066 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2067}
a0d0e21e 2068
a3bcc51e
TP
2069SV *
2070Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2071{
5fcbf73d 2072 SV *retval;
ad64d0ec
NC
2073 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2074 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2075
7918f24d
NC
2076 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2077
a3bcc51e
TP
2078 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2079 SV *key;
bfcb3514 2080 if (HvEITER_get(hv))
a3bcc51e
TP
2081 /* we are in an iteration so the hash cannot be empty */
2082 return &PL_sv_yes;
2083 /* no xhv_eiter so now use FIRSTKEY */
2084 key = sv_newmortal();
ad64d0ec 2085 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2086 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2087 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2088 }
2089
2090 /* there is a SCALAR method that we can call */
36925d9e 2091 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2092 if (!retval)
5fcbf73d 2093 retval = &PL_sv_undef;
a3bcc51e
TP
2094 return retval;
2095}
2096
a0d0e21e 2097int
864dbfa3 2098Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2099{
089b5c60 2100 SV **svp;
7918f24d
NC
2101
2102 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2103
089b5c60
NC
2104 /* The magic ptr/len for the debugger's hash should always be an SV. */
2105 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2106 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2107 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2108 }
2109
2110 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2111 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2112 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2113 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2114
8772537c 2115 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2116 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2117 if (o) {
2118#ifdef PERL_DEBUG_READONLY_OPS
2119 Slab_to_rw(OpSLAB(o));
2120#endif
2121 /* set or clear breakpoint in the relevant control op */
089b5c60 2122 if (SvTRUE(sv))
88df5f01 2123 o->op_flags |= OPf_SPECIAL;
8772537c 2124 else
88df5f01
FC
2125 o->op_flags &= ~OPf_SPECIAL;
2126#ifdef PERL_DEBUG_READONLY_OPS
2127 Slab_to_ro(OpSLAB(o));
2128#endif
8772537c 2129 }
5df8de69 2130 }
79072805
LW
2131 return 0;
2132}
2133
2134int
8772537c 2135Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2136{
502c6561 2137 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2138
2139 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2140
83bf042f 2141 if (obj) {
e1dccc0d 2142 sv_setiv(sv, AvFILL(obj));
83bf042f 2143 } else {
3773545d 2144 sv_set_undef(sv);
83bf042f 2145 }
79072805
LW
2146 return 0;
2147}
2148
2149int
864dbfa3 2150Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2151{
502c6561 2152 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2153
2154 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2155
83bf042f 2156 if (obj) {
e1dccc0d 2157 av_fill(obj, SvIV(sv));
83bf042f 2158 } else {
a2a5de95
NC
2159 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2160 "Attempt to set length of freed array");
83bf042f
NC
2161 }
2162 return 0;
2163}
2164
2165int
83f29afa
VP
2166Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2167{
83f29afa
VP
2168 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2169 PERL_UNUSED_ARG(sv);
dc3bf405 2170 PERL_UNUSED_CONTEXT;
83f29afa
VP
2171
2172 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2173 if (sizeof(IV) == sizeof(SSize_t)) {
2174 *((IV *) &(mg->mg_len)) = 0;
2175 } else {
2176 if (mg->mg_ptr)
2177 *((IV *) mg->mg_ptr) = 0;
2178 }
83f29afa
VP
2179
2180 return 0;
2181}
2182
2183int
83bf042f
NC
2184Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2185{
7918f24d 2186 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2187 PERL_UNUSED_ARG(sv);
7918f24d 2188
94f3782b
DM
2189 /* during global destruction, mg_obj may already have been freed */
2190 if (PL_in_clean_all)
1ea47f64 2191 return 0;
94f3782b 2192
83bf042f
NC
2193 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2194
2195 if (mg) {
2196 /* arylen scalar holds a pointer back to the array, but doesn't own a
2197 reference. Hence the we (the array) are about to go away with it
2198 still pointing at us. Clear its pointer, else it would be pointing
2199 at free memory. See the comment in sv_magic about reference loops,
2200 and why it can't own a reference to us. */
2201 mg->mg_obj = 0;
2202 }
a0d0e21e
LW
2203 return 0;
2204}
2205
2206int
864dbfa3 2207Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2208{
16eb5365 2209 SV* const lsv = LvTARG(sv);
96c2a8ff 2210 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2211
2212 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2213 PERL_UNUSED_ARG(mg);
ac27b0f5 2214
6174b39a
FC
2215 if (found && found->mg_len != -1) {
2216 STRLEN i = found->mg_len;
25fdce4a 2217 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2218 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2219 sv_setuv(sv, i);
a0d0e21e 2220 return 0;
a0d0e21e 2221 }
3773545d 2222 sv_set_undef(sv);
a0d0e21e
LW
2223 return 0;
2224}
2225
2226int
864dbfa3 2227Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2228{
16eb5365 2229 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2230 SSize_t pos;
2231 STRLEN len;
53d44271 2232 MAGIC* found;
aec43834 2233 const char *s;
a0d0e21e 2234
7918f24d 2235 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2236 PERL_UNUSED_ARG(mg);
ac27b0f5 2237
96c2a8ff 2238 found = mg_find_mglob(lsv);
3881461a 2239 if (!found) {
a0d0e21e
LW
2240 if (!SvOK(sv))
2241 return 0;
96c2a8ff 2242 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2243 }
2244 else if (!SvOK(sv)) {
3881461a 2245 found->mg_len = -1;
a0d0e21e
LW
2246 return 0;
2247 }
aec43834 2248 s = SvPV_const(lsv, len);
a0d0e21e 2249
e1dccc0d 2250 pos = SvIV(sv);
a0ed51b3 2251
7e2040f0 2252 if (DO_UTF8(lsv)) {
19742f39 2253 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2254 if (ulen)
2255 len = ulen;
a0ed51b3
LW
2256 }
2257
a0d0e21e
LW
2258 if (pos < 0) {
2259 pos += len;
2260 if (pos < 0)
2261 pos = 0;
2262 }
eb160463 2263 else if (pos > (SSize_t)len)
a0d0e21e 2264 pos = len;
a0ed51b3 2265
3881461a 2266 found->mg_len = pos;
25fdce4a 2267 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2268
79072805
LW
2269 return 0;
2270}
2271
2272int
864dbfa3 2273Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2274{
2275 STRLEN len;
35a4481c 2276 SV * const lsv = LvTARG(sv);
b83604b4 2277 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2278 STRLEN offs = LvTARGOFF(sv);
2279 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2280 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2281 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2282
2283 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2284 PERL_UNUSED_ARG(mg);
6ff81951 2285
83f78d1a 2286 if (!translate_substr_offsets(
4ddea69a 2287 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2288 negoff ? -(IV)offs : (IV)offs, !negoff,
2289 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2290 )) {
2291 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2292 sv_set_undef(sv);
83f78d1a
FC
2293 return 0;
2294 }
2295
9aa983d2 2296 if (SvUTF8(lsv))
4ddea69a 2297 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2298 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2299 if (SvUTF8(lsv))
2ef4b674 2300 SvUTF8_on(sv);
6ff81951
GS
2301 return 0;
2302}
2303
2304int
864dbfa3 2305Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2306{
83f78d1a 2307 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2308 const char * const tmps = SvPV_const(sv, len);
dd374669 2309 SV * const lsv = LvTARG(sv);
777f7c56
EB
2310 STRLEN lvoff = LvTARGOFF(sv);
2311 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2312 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2313 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2314
2315 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2316 PERL_UNUSED_ARG(mg);
075a4a2b 2317
a74fb2cd
FC
2318 SvGETMAGIC(lsv);
2319 if (SvROK(lsv))
2320 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2321 "Attempt to use reference as lvalue in substr"
2322 );
fc061ed8
FC
2323 SvPV_force_nomg(lsv,lsv_len);
2324 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2325 if (!translate_substr_offsets(
2326 lsv_len,
2327 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2328 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2329 ))
2330 Perl_croak(aTHX_ "substr outside of string");
2331 oldtarglen = lvlen;
1aa99e6b 2332 if (DO_UTF8(sv)) {
73a087f0 2333 sv_utf8_upgrade_nomg(lsv);
d931b1be 2334 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2335 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2336 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2337 SvUTF8_on(lsv);
2338 }
0d336106 2339 else if (SvUTF8(lsv)) {
5fcbf73d 2340 const char *utf8;
d931b1be 2341 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2342 newtarglen = len;
5fcbf73d 2343 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2344 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2345 Safefree(utf8);
1aa99e6b 2346 }
b76f3ce2 2347 else {
a74fb2cd 2348 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2349 newtarglen = len;
b76f3ce2 2350 }
83f78d1a
FC
2351 if (!neglen) LvTARGLEN(sv) = newtarglen;
2352 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2353
79072805
LW
2354 return 0;
2355}
2356
2357int
864dbfa3 2358Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2359{
7918f24d 2360 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2361 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2362#ifdef NO_TAINT_SUPPORT
2363 PERL_UNUSED_ARG(mg);
2364#endif
7918f24d 2365
64ff300b 2366 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2367 return 0;
2368}
2369
2370int
864dbfa3 2371Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2372{
7918f24d 2373 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2374 PERL_UNUSED_ARG(sv);
7918f24d 2375
b01e650a 2376 /* update taint status */
284167a5 2377 if (TAINT_get)
b01e650a
DM
2378 mg->mg_len |= 1;
2379 else
2380 mg->mg_len &= ~1;
463ee0b2
LW
2381 return 0;
2382}
2383
2384int
864dbfa3 2385Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2386{
35a4481c 2387 SV * const lsv = LvTARG(sv);
1b92e694 2388 char errflags = LvFLAGS(sv);
7918f24d
NC
2389
2390 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2391 PERL_UNUSED_ARG(mg);
6ff81951 2392
1b92e694 2393 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2394 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2395 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2396
6ff81951
GS
2397 return 0;
2398}
2399
2400int
864dbfa3 2401Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2402{
7918f24d 2403 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2404 PERL_UNUSED_ARG(mg);
79072805
LW
2405 do_vecset(sv); /* XXX slurp this routine */
2406 return 0;
2407}
2408
13733cde
FC
2409SV *
2410Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2411{
a0714e2c 2412 SV *targ = NULL;
13733cde
FC
2413 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2414 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2415 assert(mg);
5f05dabc 2416 if (LvTARGLEN(sv)) {
68dc0745 2417 if (mg->mg_obj) {
8772537c 2418 SV * const ahv = LvTARG(sv);
85fbaab2 2419 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2420 if (he)
2421 targ = HeVAL(he);
68dc0745 2422 }
bbfdc870 2423 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2424 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2425 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2426 {
2427 if (SvRMAGICAL(av)) {
2428 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2429 targ = svp ? *svp : NULL;
2430 }
2431 else
bbfdc870 2432 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2433 }
68dc0745 2434 }
46da273f 2435 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2436 /* somebody else defined it for us */
2437 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2438 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2439 LvTARGLEN(sv) = 0;
2440 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2441 mg->mg_obj = NULL;
68dc0745
PP
2442 mg->mg_flags &= ~MGf_REFCOUNTED;
2443 }
13733cde 2444 return targ;
5f05dabc 2445 }
71be2cbc 2446 else
13733cde
FC
2447 return LvTARG(sv);
2448}
2449
2450int
2451Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2452{
2453 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2454
2455 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2456 return 0;
2457}
2458
2459int
864dbfa3 2460Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2461{
7918f24d 2462 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2463 PERL_UNUSED_ARG(mg);
71be2cbc 2464 if (LvTARGLEN(sv))
68dc0745
PP
2465 vivify_defelem(sv);
2466 if (LvTARG(sv)) {
5f05dabc 2467 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2468 SvSETMAGIC(LvTARG(sv));
2469 }
5f05dabc
PP
2470 return 0;
2471}
2472
71be2cbc 2473void
864dbfa3 2474Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2475{
74e13ce4 2476 MAGIC *mg;
a0714e2c 2477 SV *value = NULL;
71be2cbc 2478
7918f24d
NC
2479 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2480
14befaf4 2481 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2482 return;
68dc0745 2483 if (mg->mg_obj) {
8772537c 2484 SV * const ahv = LvTARG(sv);
85fbaab2 2485 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2486 if (he)
2487 value = HeVAL(he);
3280af22 2488 if (!value || value == &PL_sv_undef)
be2597df 2489 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2490 }
bbfdc870
FC
2491 else if (LvSTARGOFF(sv) < 0)
2492 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2493 else {
502c6561 2494 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2495 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2496 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2497 else {
bbfdc870 2498 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2499 if (!svp || !(value = *svp))
bbfdc870 2500 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2501 }
2502 }
b37c2d43 2503 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2504 SvREFCNT_dec(LvTARG(sv));
2505 LvTARG(sv) = value;
71be2cbc 2506 LvTARGLEN(sv) = 0;
68dc0745 2507 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2508 mg->mg_obj = NULL;
68dc0745 2509 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2510}
2511
2512int
864dbfa3 2513Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2514{
7918f24d 2515 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2516 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2517 return 0;
810b8aa5
GS
2518}
2519
2520int
864dbfa3 2521Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2522{
7918f24d 2523 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2524 PERL_UNUSED_CONTEXT;
0177730e 2525 PERL_UNUSED_ARG(sv);
565764a8 2526 mg->mg_len = -1;
93a17b20
LW
2527 return 0;
2528}
2529
2530int
864dbfa3 2531Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2532{
35a4481c 2533 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2534
7918f24d
NC
2535 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2536
79072805 2537 if (uf && uf->uf_set)
24f81a43 2538 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2539 return 0;
2540}
2541
c277df42 2542int
faf82a0b
AE
2543Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2544{
488344d2 2545 const char type = mg->mg_type;
7918f24d
NC
2546
2547 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2548
a5c7cb08
DM
2549 assert( type == PERL_MAGIC_fm
2550 || type == PERL_MAGIC_qr
2551 || type == PERL_MAGIC_bm);
488344d2 2552 return sv_unmagic(sv, type);
faf82a0b
AE
2553}
2554
7a4c00b4 2555#ifdef USE_LOCALE_COLLATE
79072805 2556int
864dbfa3 2557Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2558{
7918f24d
NC
2559 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2560
bbce6d69 2561 /*
838b5b74 2562 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2563 * and vanished with a faint plop.
2564 */
96a5add6 2565 PERL_UNUSED_CONTEXT;
8772537c 2566 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2567 if (mg->mg_ptr) {
2568 Safefree(mg->mg_ptr);
2569 mg->mg_ptr = NULL;
565764a8 2570 mg->mg_len = -1;
7a4c00b4 2571 }
bbce6d69
PP
2572 return 0;
2573}
7a4c00b4 2574#endif /* USE_LOCALE_COLLATE */
bbce6d69 2575
7e8c5dac
HS
2576/* Just clear the UTF-8 cache data. */
2577int
2578Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2579{
7918f24d 2580 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2581 PERL_UNUSED_CONTEXT;
8772537c 2582 PERL_UNUSED_ARG(sv);
7e8c5dac 2583 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2584 mg->mg_ptr = NULL;
7e8c5dac
HS
2585 mg->mg_len = -1; /* The mg_len holds the len cache. */
2586 return 0;
2587}
2588
bbce6d69 2589int
9cce4f9a
FC
2590Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2591{
9782ce69 2592 const char *bad = NULL;
9cce4f9a 2593 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2594 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2595 switch (mg->mg_private & OPpLVREF_TYPE) {
2596 case OPpLVREF_SV:
2597 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2598 bad = " SCALAR";
2599 break;
2600 case OPpLVREF_AV:
2601 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2602 bad = "n ARRAY";
2603 break;
2604 case OPpLVREF_HV:
2605 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2606 bad = " HASH";
2607 break;
2608 case OPpLVREF_CV:
2609 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2610 bad = " CODE";
2611 }
2612 if (bad)
26a50d99 2613 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2614 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2615 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2616 case 0:
2617 {
2618 SV * const old = PAD_SV(mg->mg_len);
2619 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2620 SvREFCNT_dec(old);
2621 break;
2622 }
2623 case SVt_PVGV:
2624 gv_setref(mg->mg_obj, sv);
2625 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2626 break;
2627 case SVt_PVAV:
2628 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2629 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2630 break;
2631 case SVt_PVHV:
7fcb36d5
JH
2632 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2633 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2634 }
d39c26a6
FC
2635 if (mg->mg_flags & MGf_PERSIST)
2636 NOOP; /* This sv is in use as an iterator var and will be reused,
2637 so we must leave the magic. */
2638 else
2639 /* This sv could be returned by the assignment op, so clear the
2640 magic, as lvrefs are an implementation detail that must not be
2641 leaked to the user. */
2642 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2643 return 0;
2644}
2645
f1540bed
JH
2646static void
2647S_set_dollarzero(pTHX_ SV *sv)
2648 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2649{
2650#ifdef USE_ITHREADS
2651 dVAR;
2652#endif
2653 const char *s;
2654 STRLEN len;
f1540bed
JH
2655#ifdef HAS_SETPROCTITLE
2656 /* The BSDs don't show the argv[] in ps(1) output, they
2657 * show a string from the process struct and provide
2658 * the setproctitle() routine to manipulate that. */
2659 if (PL_origalen != 1) {
2660 s = SvPV_const(sv, len);
38626956 2661# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2662 /* The leading "-" removes the "perl: " prefix,
2663 * but not the "(perl) suffix from the ps(1)
2664 * output, because that's what ps(1) shows if the
2665 * argv[] is modified. */
2666 setproctitle("-%s", s);
2667# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2668 /* This doesn't really work if you assume that
2669 * $0 = 'foobar'; will wipe out 'perl' from the $0
2670 * because in ps(1) output the result will be like
2671 * sprintf("perl: %s (perl)", s)
2672 * I guess this is a security feature:
2673 * one (a user process) cannot get rid of the original name.
2674 * --jhi */
2675 setproctitle("%s", s);
2676# endif
2677 }
2678#elif defined(__hpux) && defined(PSTAT_SETCMD)
2679 if (PL_origalen != 1) {
2680 union pstun un;
2681 s = SvPV_const(sv, len);
2682 un.pst_command = (char *)s;
2683 pstat(PSTAT_SETCMD, un, len, 0, 0);
2684 }
2685#else
2686 if (PL_origalen > 1) {
4f3e04fd 2687 I32 i;
f1540bed
JH
2688 /* PL_origalen is set in perl_parse(). */
2689 s = SvPV_force(sv,len);
2690 if (len >= (STRLEN)PL_origalen-1) {
2691 /* Longer than original, will be truncated. We assume that
2692 * PL_origalen bytes are available. */
2693 Copy(s, PL_origargv[0], PL_origalen-1, char);
2694 }
2695 else {
2696 /* Shorter than original, will be padded. */
2697#ifdef PERL_DARWIN
2698 /* Special case for Mac OS X: see [perl #38868] */
2699 const int pad = 0;
2700#else
2701 /* Is the space counterintuitive? Yes.
2702 * (You were expecting \0?)
2703 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2704 * --jhi */
2705 const int pad = ' ';
2706#endif
2707 Copy(s, PL_origargv[0], len, char);
2708 PL_origargv[0][len] = 0;
2709 memset(PL_origargv[0] + len + 1,
2710 pad, PL_origalen - len - 1);
2711 }
2712 PL_origargv[0][PL_origalen-1] = 0;
2713 for (i = 1; i < PL_origargc; i++)
2714 PL_origargv[i] = 0;
2715#ifdef HAS_PRCTL_SET_NAME
2716 /* Set the legacy process name in addition to the POSIX name on Linux */
2717 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2718 /* diag_listed_as: SKIPME */
2719 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2720 }
2721#endif
2722 }
2723#endif
2724}
2725
9cce4f9a 2726int
864dbfa3 2727Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2728{
20b7effb 2729#ifdef USE_ITHREADS
97aff369 2730 dVAR;
20b7effb 2731#endif
eb578fdb
KW
2732 I32 paren;
2733 const REGEXP * rx;
79072805 2734 I32 i;
8990e307 2735 STRLEN len;
125b9982 2736 MAGIC *tmg;
2fdbfb4d 2737
7918f24d
NC
2738 PERL_ARGS_ASSERT_MAGIC_SET;
2739
e91d8259 2740 if (!mg->mg_ptr) {
960b831f 2741 paren = mg->mg_len;
1e05feb3 2742 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2743 setparen_got_rx:
2fdbfb4d 2744 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2745 } else {
2fdbfb4d
AB
2746 /* Croak with a READONLY error when a numbered match var is
2747 * set without a previous pattern match. Unless it's C<local $1>
2748 */
e91d8259 2749 croakparen:
2fdbfb4d 2750 if (!PL_localizing) {
cb077ed2 2751 Perl_croak_no_modify();
2fdbfb4d
AB
2752 }
2753 }
e91d8259
NC
2754 return 0;
2755 }
2756
2757 switch (*mg->mg_ptr) {
748a9306 2758 case '\001': /* ^A */
f2da823f
FC
2759 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2760 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2761 FmLINES(PL_bodytarget) = 0;
2762 if (SvPOK(PL_bodytarget)) {
2763 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2764 char *e = SvEND(PL_bodytarget);
2765 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2766 FmLINES(PL_bodytarget)++;
2767 s++;
2768 }
2769 }
125b9982 2770 /* mg_set() has temporarily made sv non-magical */
284167a5 2771 if (TAINTING_get) {
125b9982
NT
2772 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2773 SvTAINTED_on(PL_bodytarget);
2774 else
2775 SvTAINTED_off(PL_bodytarget);
2776 }
748a9306 2777 break;
49460fe6 2778 case '\003': /* ^C */
f2338a2e 2779 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2780 break;
2781
79072805 2782 case '\004': /* ^D */
b4ab917c 2783#ifdef DEBUGGING
a9e2d2bf
DM
2784 {
2785 const char *s = SvPV_nolen_const(sv);
2786 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2787 if (DEBUG_x_TEST || DEBUG_B_TEST)
2788 dump_all_perl(!DEBUG_B_TEST);
2789 }
b4ab917c 2790#else
38ab35f8 2791 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2792#endif
79072805 2793 break;
28f23441 2794 case '\005': /* ^E */
d0063567 2795 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2796#ifdef VMS
38ab35f8 2797 set_vaxc_errno(SvIV(sv));
2abc681d 2798#elif defined(WIN32)
d0063567 2799 SetLastError( SvIV(sv) );
2abc681d 2800#elif defined(OS2)
38ab35f8 2801 os2_setsyserrno(SvIV(sv));
2abc681d 2802#else
d0063567 2803 /* will anyone ever use this? */
38ab35f8 2804 SETERRNO(SvIV(sv), 4);
22fae026 2805#endif
d0063567 2806 }
fd503f5c
DIM
2807 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2808 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2809 break;
79072805 2810 case '\006': /* ^F */
38ab35f8 2811 PL_maxsysfd = SvIV(sv);
79072805 2812 break;
a0d0e21e 2813 case '\010': /* ^H */
efa571ab
KW
2814 {
2815 U32 save_hints = PL_hints;
5d382c25 2816 PL_hints = SvUV(sv);
efa571ab
KW
2817
2818 /* If wasn't UTF-8, and now is, notify the parser */
2819 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2820 notify_parser_that_changed_to_utf8();
2821 }
2822 }
a0d0e21e 2823 break;
9d116dd7 2824 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2825 Safefree(PL_inplace);
bd61b366 2826 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2827 break;
d9bad346
FC
2828 case '\016': /* ^N */
2829 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2830 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2831 goto croakparen;
28f23441 2832 case '\017': /* ^O */
ac27b0f5 2833 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2834 Safefree(PL_osname);
bd61b366 2835 PL_osname = NULL;
3511154c
DM
2836 if (SvOK(sv)) {
2837 TAINT_PROPER("assigning to $^O");
2e0de35c 2838 PL_osname = savesvpv(sv);
3511154c 2839 }
ac27b0f5
NIS
2840 }
2841 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2842 STRLEN len;
2843 const char *const start = SvPV(sv, len);
b54fc2b6 2844 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2845 SV *tmp;
8b850bd5
NC
2846
2847
2848 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2849 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2850
2851 /* Opening for input is more common than opening for output, so
2852 ensure that hints for input are sooner on linked list. */
59cd0e26 2853 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2854 SvUTF8(sv))
2855 : newSVpvs_flags("", SvUTF8(sv));
2856 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2857 mg_set(tmp);
8b850bd5 2858
f747ebd6
Z
2859 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2860 SvUTF8(sv));
2861 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2862 mg_set(tmp);
ac27b0f5 2863 }
28f23441 2864 break;
79072805 2865 case '\020': /* ^P */
2fdbfb4d
AB
2866 PL_perldb = SvIV(sv);
2867 if (PL_perldb && !PL_DBsingle)
2868 init_debugger();
9b9e0be4 2869 break;
79072805 2870 case '\024': /* ^T */
88e89b8a 2871#ifdef BIG_TIME
6b88bc9c 2872 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2873#else
38ab35f8 2874 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2875#endif
79072805 2876 break;
e07ea26a
NC
2877 case '\025': /* ^UTF8CACHE */
2878 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2879 PL_utf8cache = (signed char) sv_2iv(sv);
2880 }
2881 break;
fde18df1 2882 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2883 if (*(mg->mg_ptr+1) == '\0') {
2884 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2885 i = SvIV(sv);
ac27b0f5 2886 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2887 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2888 }
599cee73 2889 }
0a378802 2890 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2891 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2892 if (!SvPOK(sv)) {
2893 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2894 break;
2895 }
f4fc7782 2896 {
b5477537 2897 STRLEN len, i;
006c1a1d
Z
2898 int not_none = 0, not_all = 0;
2899 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2900 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2901 not_none |= ptr[i];
2902 not_all |= ptr[i] ^ 0x55;
f4fc7782 2903 }
006c1a1d 2904 if (!not_none) {
4243c432
NC
2905 if (!specialWARN(PL_compiling.cop_warnings))
2906 PerlMemShared_free(PL_compiling.cop_warnings);
2907 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2908 } else if (len >= WARNsize && !not_all) {
2909 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2910 PerlMemShared_free(PL_compiling.cop_warnings);
2911 PL_compiling.cop_warnings = pWARN_ALL;
2912 PL_dowarn |= G_WARN_ONCE ;
2913 }
d3a7d8c7 2914 else {
72dc9ed5
NC
2915 STRLEN len;
2916 const char *const p = SvPV_const(sv, len);
2917
2918 PL_compiling.cop_warnings
8ee4cf24 2919 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2920 p, len);
2921
d3a7d8c7
GS
2922 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2923 PL_dowarn |= G_WARN_ONCE ;
2924 }
f4fc7782 2925
d3a7d8c7 2926 }
4438c4b7 2927 }
971a9dd3 2928 }
8ca2a5d6
DD
2929#ifdef WIN32
2930 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2931 w32_sloppystat = (bool)sv_true(sv);
2932 }
2933#endif
79072805
LW
2934 break;
2935 case '.':
3280af22
NIS
2936 if (PL_localizing) {
2937 if (PL_localizing == 1)
7766f137 2938 SAVESPTR(PL_last_in_gv);
748a9306 2939 }
3280af22 2940 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2941 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2942 break;
2943 case '^':
acbe1b9d 2944 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2945 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2946 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2947 break;
2948 case '~':
acbe1b9d 2949 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2950 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2951 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2952 break;
2953 case '=':
acbe1b9d 2954 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2955 break;
2956 case '-':
acbe1b9d
FC
2957 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2958 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2959 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2960 break;
2961 case '%':
acbe1b9d 2962 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2963 break;
2964 case '|':
4b65379b 2965 {
099be4f1 2966 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2967 if(!io)
2968 break;
38ab35f8 2969 if ((SvIV(sv)) == 0)
4b65379b
CS
2970 IoFLAGS(io) &= ~IOf_FLUSH;
2971 else {
2972 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2973 PerlIO *ofp = IoOFP(io);
2974 if (ofp)
2975 (void)PerlIO_flush(ofp);
2976 IoFLAGS(io) |= IOf_FLUSH;
2977 }
2978 }
79072805
LW
2979 }
2980 break;
79072805 2981 case '/':
1ab48e3a 2982 {
1ab48e3a 2983 if (SvROK(sv)) {
8d37cdf7
DIM
2984 SV *referent = SvRV(sv);
2985 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
2986 /* XXX: dodgy type check: This leaves me feeling dirty, but
2987 * the alternative is to copy pretty much the entire
2988 * sv_reftype() into this routine, or to do a full string
2989 * comparison on the return of sv_reftype() both of which
2990 * make me feel worse! NOTE, do not modify this comment
2991 * without reviewing the corresponding comment in
2992 * sv_reftype(). - Yves */
1ab48e3a 2993 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 2994 IV val = SvIV(referent);
1ab48e3a 2995 if (val <= 0) {
520b6fb6
DIM
2996 sv_setsv(sv, PL_rs);
2997 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
2998 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
2999 }
3000 } else {
ddce084a 3001 sv_setsv(sv, PL_rs);
8d37cdf7 3002 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3003 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3004 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3005 }
3006 }
b3a2acfa 3007 SvREFCNT_dec(PL_rs);
520b6fb6 3008 PL_rs = newSVsv(sv);
b3a2acfa 3009 }
79072805
LW
3010 break;
3011 case '\\':
ef8d46e8 3012 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3013 if (SvOK(sv)) {
7889fe52 3014 PL_ors_sv = newSVsv(sv);
009c130f 3015 }
e3c19b7b 3016 else {
a0714e2c 3017 PL_ors_sv = NULL;
e3c19b7b 3018 }
79072805 3019 break;
7d69d4a6
FC
3020 case '[':
3021 if (SvIV(sv) != 0)
3022 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3023 break;
79072805 3024 case '?':
ff0cee69 3025#ifdef COMPLEX_STATUS
6b88bc9c 3026 if (PL_localizing == 2) {
41cb7b2b 3027 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3028 PL_statusvalue = LvTARGOFF(sv);
3029 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3030 }
3031 else
3032#endif
3033#ifdef VMSISH_STATUS
3034 if (VMSISH_STATUS)
fb38d079 3035 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3036 else
3037#endif
38ab35f8 3038 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3039 break;
3040 case '!':
93189314
JH
3041 {
3042#ifdef VMS
3043# define PERL_VMS_BANG vaxc$errno
3044#else
3045# define PERL_VMS_BANG 0
3046#endif
27329181 3047#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
3048 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3049 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3050#else
91487cfc 3051 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3052 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3053#endif
93189314 3054 }
79072805
LW
3055 break;
3056 case '<':
985213f2 3057 {
b469f1e0 3058 /* XXX $< currently silently ignores failures */
dfff4baf 3059 const Uid_t new_uid = SvUID(sv);
985213f2 3060 PL_delaymagic_uid = new_uid;
3280af22
NIS
3061 if (PL_delaymagic) {
3062 PL_delaymagic |= DM_RUID;
79072805
LW
3063 break; /* don't do magic till later */
3064 }
3065#ifdef HAS_SETRUID
b469f1e0 3066 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3067#elif defined(HAS_SETREUID)
b469f1e0 3068 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3069#elif defined(HAS_SETRESUID)
b469f1e0 3070 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3071#else
985213f2 3072 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3073# ifdef PERL_DARWIN
75870ed3 3074 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3075 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3076 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3077# endif
b469f1e0 3078 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3079 } else {
cea2e8a9 3080 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3081 }
79072805 3082#endif
79072805 3083 break;
985213f2 3084 }
79072805 3085 case '>':
985213f2 3086 {
b469f1e0 3087 /* XXX $> currently silently ignores failures */
dfff4baf 3088 const Uid_t new_euid = SvUID(sv);
985213f2 3089 PL_delaymagic_euid = new_euid;
3280af22
NIS
3090 if (PL_delaymagic) {
3091 PL_delaymagic |= DM_EUID;
79072805
LW
3092 break; /* don't do magic till later */
3093 }
3094#ifdef HAS_SETEUID
b469f1e0 3095 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3096#elif defined(HAS_SETREUID)
b469f1e0 3097 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3098#elif defined(HAS_SETRESUID)
b469f1e0 3099 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3100#else
985213f2 3101 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3102 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3103 else {
cea2e8a9 3104 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3105 }
79072805 3106#endif
79072805 3107 break;
985213f2 3108 }
79072805 3109 case '(':
985213f2 3110 {
b469f1e0 3111 /* XXX $( currently silently ignores failures */
dfff4baf 3112 const Gid_t new_gid = SvGID(sv);
985213f2 3113 PL_delaymagic_gid = new_gid;
3280af22
NIS
3114 if (PL_delaymagic) {
3115 PL_delaymagic |= DM_RGID;
79072805
LW
3116 break; /* don't do magic till later */
3117 }
3118#ifdef HAS_SETRGID
b469f1e0 3119 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3120#elif defined(HAS_SETREGID)
b469f1e0 3121 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3122#elif defined(HAS_SETRESGID)
b469f1e0 3123 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3124#else
985213f2 3125 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3126 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3127 else {
cea2e8a9 3128 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3129 }
79072805 3130#endif
79072805 3131 break;
985213f2 3132 }
79072805 3133 case ')':
985213f2 3134 {
0635704a
HS
3135/* (hv) best guess: maybe we'll need configure probes to do a better job,
3136 * but you can override it if you need to.
3137 */
3138#ifndef INVALID_GID
3139#define INVALID_GID ((Gid_t)-1)
3140#endif
b469f1e0 3141 /* XXX $) currently silently ignores failures */
dfff4baf 3142 Gid_t new_egid;
5cd24f17
PP
3143#ifdef HAS_SETGROUPS
3144 {
b83604b4 3145 const char *p = SvPV_const(sv, len);
757f63d8 3146 Groups_t *gary = NULL;
fdadaf77 3147 const char* endptr;
22ff3130 3148 UV uv;
fb4089e0 3149#ifdef _SC_NGROUPS_MAX
3150 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3151
3152 if (maxgrp < 0)
3153 maxgrp = NGROUPS;
3154#else
3155 int maxgrp = NGROUPS;
3156#endif
757f63d8
SP
3157
3158 while (isSPACE(*p))
3159 ++p;
22ff3130
HS
3160 if (grok_atoUV(p, &uv, &endptr))
3161 new_egid = (Gid_t)uv;
3162 else {
0635704a 3163 new_egid = INVALID_GID;
22ff3130
HS
3164 endptr = NULL;
3165 }
fb4089e0 3166 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3167 if (endptr == NULL)
3168 break;
3169 p = endptr;
757f63d8
SP
3170 while (isSPACE(*p))
3171 ++p;
3172 if (!*p)
3173 break;
fdadaf77 3174 if (!gary)
757f63d8
SP
3175 Newx(gary, i + 1, Groups_t);
3176 else
3177 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3178 if (grok_atoUV(p, &uv, &endptr))
3179 gary[i] = (Groups_t)uv;
3180 else {
0635704a 3181 gary[i] = INVALID_GID;
22ff3130
HS
3182 endptr = NULL;
3183 }
757f63d8
SP
3184 }
3185 if (i)
b469f1e0 3186 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3187 Safefree(gary);
5cd24f17
PP
3188 }
3189#else /* HAS_SETGROUPS */
dfff4baf 3190 new_egid = SvGID(sv);
5cd24f17 3191#endif /* HAS_SETGROUPS */
985213f2 3192 PL_delaymagic_egid = new_egid;
3280af22
NIS
3193 if (PL_delaymagic) {
3194 PL_delaymagic |= DM_EGID;
79072805
LW
3195 break; /* don't do magic till later */
3196 }
3197#ifdef HAS_SETEGID
b469f1e0 3198 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3199#elif defined(HAS_SETREGID)
b469f1e0 3200 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3201#elif defined(HAS_SETRESGID)
b469f1e0 3202 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3203#else
985213f2 3204 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3205 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3206 else {
cea2e8a9 3207 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3208 }
79072805 3209#endif
79072805 3210 break;
985213f2 3211 }
79072805 3212 case ':':
2d8e6c8d 3213 PL_chopset = SvPV_force(sv,len);
79072805 3214 break;
9cdac2a2
FC
3215 case '$': /* $$ */
3216 /* Store the pid in mg->mg_obj so we can tell when a fork has
3217 occurred. mg->mg_obj points to *$ by default, so clear it. */
3218 if (isGV(mg->mg_obj)) {
3219 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3220 SvREFCNT_dec(mg->mg_obj);
3221 mg->mg_flags |= MGf_REFCOUNTED;
3222 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3223 }
3224 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3225 break;
79072805 3226 case '0':
e2975953 3227 LOCK_DOLLARZERO_MUTEX;
f1540bed 3228 S_set_dollarzero(aTHX_ sv);
e2975953 3229 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3230 break;
3231 }
3232 return 0;
3233}
3234
3235I32
84c7b88c
BF
3236Perl_whichsig_sv(pTHX_ SV *sigsv)
3237{
3238 const char *sigpv;
3239 STRLEN siglen;
3240 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3241 sigpv = SvPV_const(sigsv, siglen);
3242 return whichsig_pvn(sigpv, siglen);
3243}
3244
3245I32
3246Perl_whichsig_pv(pTHX_ const char *sig)
3247{
3248 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3249 return whichsig_pvn(sig, strlen(sig));
3250}
3251
3252I32
3253Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3254{
eb578fdb 3255 char* const* sigv;
7918f24d 3256
84c7b88c 3257 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3258 PERL_UNUSED_CONTEXT;
79072805 3259
aadb217d 3260 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3261 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3262 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3263#ifdef SIGCLD
84c7b88c 3264 if (memEQs(sig, len, "CHLD"))
79072805
LW
3265 return SIGCLD;
3266#endif
3267#ifdef SIGCHLD
84c7b88c 3268 if (memEQs(sig, len, "CLD"))
79072805
LW
3269 return SIGCHLD;
3270#endif
7f1236c0 3271 return -1;
79072805
LW
3272}
3273
ecfc5424 3274Signal_t
1e82f5a6 3275#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3276Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3277#else
3278Perl_sighandler(int sig)
3279#endif
79072805 3280{
1018e26f
NIS
3281#ifdef PERL_GET_SIG_CONTEXT
3282 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3283#else
cea2e8a9 3284 dTHX;
71d280e3 3285#endif
79072805 3286 dSP;
a0714e2c
SS
3287 GV *gv = NULL;
3288 SV *sv = NULL;
8772537c 3289 SV * const tSv = PL_Sv;
601f1833 3290 CV *cv = NULL;
533c011a 3291 OP *myop = PL_op;
84902520 3292 U32 flags = 0;
8772537c 3293 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3294 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3295 SV *errsv_save = NULL;
71d280e3 3296
84902520 3297
727405f8 3298 if (!PL_psig_ptr[sig]) {
99ef548b 3299 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3300 PL_sig_name[sig]);
3301 exit(sig);
3302 }
ff0cee69 3303
a0d63a7b
DM
3304 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3305 /* Max number of items pushed there is 3*n or 4. We cannot fix
3306 infinity, so we fix 4 (in fact 5): */
3307 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3308 flags |= 1;
3309 PL_savestack_ix += 5; /* Protect save in progress. */
3310 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3311 }
84902520 3312 }
84902520 3313 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3314 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3315 || SvTYPE(cv) != SVt_PVCV) {
3316 HV *st;
f2c0649b 3317 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3318 }
84902520 3319
a0d0e21e 3320 if (!cv || !CvROOT(cv)) {
07c325bb 3321 const HEK * const hek = gv
1d6bb9ae
FC
3322 ? GvENAME_HEK(gv)
3323 : cv && CvNAMED(cv)
3324 ? CvNAME_HEK(cv)
07c325bb
FC
3325 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3326 if (hek)
3327 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3328 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3329 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3330 /* diag_listed_as: SIG%s handler "%s" not defined */
3331 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3332 "SIG%s handler \"__ANON__\" not defined.\n",
3333 PL_sig_name[sig]);
00d579c5 3334 goto cleanup;
79072805
LW
3335 }
3336
0c4d3b5e
DM
3337 sv = PL_psig_name[sig]
3338 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3339 : newSVpv(PL_sig_name[sig],0);
72048cfe 3340 flags |= 8;
0c4d3b5e
DM
3341 SAVEFREESV(sv);
3342
a0d63a7b
DM
3343 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3344 /* make sure our assumption about the size of the SAVEs are correct:
3345 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3346 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3347 }
e336de0d 3348
e788e7d3 3349 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3350 PUSHMARK(SP);
79072805 3351 PUSHs(sv);
8aad04aa
JH
3352#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3353 {
3354 struct sigaction oact;
3355
3356 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3357 if (sip) {
3358 HV *sih = newHV();
ad64d0ec 3359 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3360 /* The siginfo fields signo, code, errno, pid, uid,
3361 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3362 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3363 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3364#ifdef HAS_SIGINFO_SI_ERRNO
3365 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3366#endif
3367#ifdef HAS_SIGINFO_SI_STATUS
3368 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3369#endif
3370#ifdef HAS_SIGINFO_SI_UID
3371 {
3372 SV *uid = newSV(0);
3373 sv_setuid(uid, sip->si_uid);
3374 (void)hv_stores(sih, "uid", uid);
3375 }
3376#endif
3377#ifdef HAS_SIGINFO_SI_PID
3378 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3379#endif
3380#ifdef HAS_SIGINFO_SI_ADDR
3381 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3382#endif
3383#ifdef HAS_SIGINFO_SI_BAND
3384 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3385#endif
8aad04aa 3386 EXTEND(SP, 2);
ad64d0ec 3387 PUSHs(rv);
22f1178f 3388 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3389 }
b4552a27 3390
8aad04aa
JH
3391 }
3392 }
3393#endif
79072805 3394 PUTBACK;
a0d0e21e 3395
100c03aa
JL
3396 errsv_save = newSVsv(ERRSV);
3397
ad64d0ec 3398 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3399
d3acc0f7 3400 POPSTACK;
eed484f9
DD
3401 {
3402 SV * const errsv = ERRSV;
3403 if (SvTRUE_NN(errsv)) {
3404 SvREFCNT_dec(errsv_save);
c22d665b 3405#ifndef PERL_MICRO
1b266415
NIS
3406 /* Handler "died", for example to get out of a restart-able read().
3407 * Before we re-do that on its behalf re-enable the signal which was
3408 * blocked by the system when we entered.
3409 */
c22d665b 3410#ifdef HAS_SIGPROCMASK
d488af49 3411#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3412 if (sip || uap)
c22d665b 3413#endif
eed484f9
DD
3414 {
3415 sigset_t set;
3416 sigemptyset(&set);
3417 sigaddset(&set,sig);
3418 sigprocmask(SIG_UNBLOCK, &set, NULL);
3419 }
c22d665b 3420#else
eed484f9
DD
3421 /* Not clear if this will work */
3422 (void)rsignal(sig, SIG_IGN);
3423 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3424#endif
3425#endif /* !PERL_MICRO */
eed484f9
DD
3426 die_sv(errsv);
3427 }
3428 else {
3429 sv_setsv(errsv, errsv_save);
3430 SvREFCNT_dec(errsv_save);
3431 }
100c03aa
JL
3432 }
3433
7b52d656 3434 cleanup:
0c4d3b5e
DM
3435 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3436 PL_savestack_ix = old_ss_ix;
72048cfe 3437 if (flags & 8)
2357bae7 3438 SvREFCNT_dec_NN(sv);
533c011a 3439 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3440
3280af22
NIS
3441 PL_Sv = tSv; /* Restore global temporaries. */
3442 PL_Xpv = tXpv;
53bb94e2 3443 return;
79072805 3444}
4e35701f
NIS
3445
3446
51371543 3447static void
8772537c 3448S_restore_magic(pTHX_ const void *p)
51371543 3449{
8772537c
AL
3450 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3451 SV* const sv = mgs->mgs_sv;
150b625d 3452 bool bumped;
51371543
GS
3453
3454 if (!sv)
3455 return;
3456
4bac9ae4
CS
3457 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3458 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC
3459 if (mgs->mgs_flags)
3460 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS
3461 else
3462 mg_magical(sv);
51371543
GS
3463 }
3464
150b625d