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