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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 820 * an entirely invariant string. We assume that if the string looks
fab19207
KW
821 * like UTF-8 in a single script, it really is UTF-8: "text in any
822 * other encoding that uses bytes with the high bit set is extremely
823 * unlikely to pass a UTF-8 validity test"
9f10db87
KW
824 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
825 * potential that we will get it wrong however, especially on short
a8f4b0c6 826 * error message text, so do an additional check. */
027a0d26
KW
827 if ( ! IN_BYTES /* respect 'use bytes' */
828 && is_utf8_non_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
a8f4b0c6
KW
829
830#ifdef USE_LOCALE_MESSAGES
831
61520eee 832 && _is_cur_LC_category_utf8(LC_MESSAGES)
a8f4b0c6 833
fab19207
KW
834#else /* If can't check directly, at least can see if script is consistent,
835 under UTF-8, which gives us an extra measure of confidence. */
836
837 && isSCRIPT_RUN((const U8 *) SvPVX_const(sv), (U8 *) SvEND(sv),
8c53dada 838 TRUE) /* Means assume UTF-8 */
a8f4b0c6
KW
839#endif
840
841 ) {
d3c0b317
KW
842 SvUTF8_on(sv);
843 }
b35e4f8b 844 }
d9fe7d23
KW
845}
846
658db622
Z
847/*
848=for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
849
850Generates the message string describing an OS error and returns it as
851an SV. C<errnum> must be a value that C<errno> could take, identifying
852the type of error.
853
854If C<tgtsv> is non-null then the string will be written into that SV
855(overwriting existing content) and it will be returned. If C<tgtsv>
856is a null pointer then the string will be written into a new mortal SV
857which will be returned.
858
859The message will be taken from whatever locale would be used by C<$!>,
860and will be encoded in the SV in whatever manner would be used by C<$!>.
861The details of this process are subject to future change. Currently,
862the message is taken from the C locale by default (usually producing an
863English message), and from the currently selected locale when in the scope
864of the C<use locale> pragma. A heuristic attempt is made to decode the
865message from the locale's character encoding, but it will only be decoded
866as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
867locale, usually in an ISO-8859-1 locale, and never in any other locale.
868
869The SV is always returned containing an actual string, and with no other
870OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
871(meaning success), and if no useful message is available then a useless
872string (currently empty) is returned.
873
874=cut
875*/
876
877SV *
878Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
879{
880 char const *errstr;
881 if(!tgtsv)
882 tgtsv = sv_newmortal();
883 errstr = my_strerror(errnum);
884 if(errstr) {
885 sv_setpv(tgtsv, errstr);
886 fixup_errno_string(tgtsv);
887 } else {
888 SvPVCLEAR(tgtsv);
889 }
890 return tgtsv;
891}
892
25bbd826
CB
893#ifdef VMS
894#include <descrip.h>
895#include <starlet.h>
896#endif
897
79072805 898int
864dbfa3 899Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 900{
eb578fdb
KW
901 I32 paren;
902 const char *s = NULL;
903 REGEXP *rx;
823a54a3 904 const char * const remaining = mg->mg_ptr + 1;
e91d8259 905 char nextchar;
79072805 906
7918f24d
NC
907 PERL_ARGS_ASSERT_MAGIC_GET;
908
e91d8259 909 if (!mg->mg_ptr) {
e91d8259 910 paren = mg->mg_len;
e91d8259 911 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 912 do_numbuf_fetch:
e91d8259 913 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 914 }
e03e82a0
DM
915 else
916 goto set_undef;
e91d8259
NC
917 return 0;
918 }
919
920 nextchar = *remaining;
79072805 921 switch (*mg->mg_ptr) {
748a9306 922 case '\001': /* ^A */
f2da823f 923 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
924 else
925 sv_set_undef(sv);
125b9982
NT
926 if (SvTAINTED(PL_bodytarget))
927 SvTAINTED_on(sv);
748a9306 928 break;
e5218da5 929 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 930 if (nextchar == '\0') {
e5218da5
GA
931 sv_setiv(sv, (IV)PL_minus_c);
932 }
823a54a3 933 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
934 sv_setiv(sv, (IV)STATUS_NATIVE);
935 }
49460fe6
NIS
936 break;
937
79072805 938 case '\004': /* ^D */
aea4f609 939 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 940 break;
28f23441 941 case '\005': /* ^E */
6c6eab55
KW
942 if (nextchar != '\0') {
943 if (strEQ(remaining, "NCODING"))
3773545d 944 sv_set_undef(sv);
4f4ff3a7 945 break;
6c6eab55 946 }
4f4ff3a7
KW
947
948#if defined(VMS) || defined(OS2) || defined(WIN32)
949# if defined(VMS)
2a99ff86
KW
950 {
951 char msg[255];
952 $DESCRIPTOR(msgdsc,msg);
953 sv_setnv(sv,(NV) vaxc$errno);
954 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
955 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
956 else
b2aed775 957 SvPVCLEAR(sv);
2a99ff86 958 }
4b645107 959#elif defined(OS2)
2a99ff86
KW
960 if (!(_emx_env & 0x200)) { /* Under DOS */
961 sv_setnv(sv, (NV)errno);
2c6ee1a7 962 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
963 } else {
964 if (errno != errno_isOS2) {
965 const int tmp = _syserrno();
966 if (tmp) /* 2nd call to _syserrno() makes it 0 */
967 Perl_rc = tmp;
968 }
969 sv_setnv(sv, (NV)Perl_rc);
970 sv_setpv(sv, os2error(Perl_rc));
971 }
1534c6f5 972 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
973 fixup_errno_string(sv);
974 }
4f4ff3a7 975# elif defined(WIN32)
2a99ff86
KW
976 {
977 const DWORD dwErr = GetLastError();
978 sv_setnv(sv, (NV)dwErr);
979 if (dwErr) {
980 PerlProc_GetOSError(sv, dwErr);
2efab60d 981 fixup_errno_string(sv);
2a99ff86
KW
982 }
983 else
b2aed775 984 SvPVCLEAR(sv);
2a99ff86
KW
985 SetLastError(dwErr);
986 }
4f4ff3a7
KW
987# else
988# error Missing code for platform
989# endif
2a99ff86
KW
990 SvRTRIM(sv);
991 SvNOK_on(sv); /* what a wonderful hack! */
992 break;
4f4ff3a7
KW
993#endif /* End of platforms with special handling for $^E; others just fall
994 through to $! */
2165bd23 995 /* FALLTHROUGH */
46f3e16c
KW
996
997 case '!':
998 {
5f1b979d 999 dSAVE_ERRNO;
46f3e16c 1000#ifdef VMS
5f1b979d 1001 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 1002#else
5f1b979d 1003 sv_setnv(sv, (NV)errno);
46f3e16c
KW
1004#endif
1005#ifdef OS2
5f1b979d
KW
1006 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1007 sv_setpv(sv, os2error(Perl_rc));
1008 else
46f3e16c 1009#endif
5f1b979d 1010 if (! errno) {
b2aed775 1011 SvPVCLEAR(sv);
46f3e16c 1012 }
5f1b979d 1013 else {
658db622
Z
1014 sv_string_from_errnum(errno, sv);
1015 /* If no useful string is available, don't
1016 * claim to have a string part. The SvNOK_on()
5f1b979d 1017 * below will cause just the number part to be valid */
658db622
Z
1018 if (!SvCUR(sv))
1019 SvPOK_off(sv);
5f1b979d
KW
1020 }
1021 RESTORE_ERRNO;
46f3e16c
KW
1022 }
1023
1024 SvRTRIM(sv);
1025 SvNOK_on(sv); /* what a wonderful hack! */
1026 break;
1027
79072805 1028 case '\006': /* ^F */
3280af22 1029 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 1030 break;
9ebf26ad
FR
1031 case '\007': /* ^GLOBAL_PHASE */
1032 if (strEQ(remaining, "LOBAL_PHASE")) {
1033 sv_setpvn(sv, PL_phase_names[PL_phase],
1034 strlen(PL_phase_names[PL_phase]));
1035 }
1036 break;
a0d0e21e 1037 case '\010': /* ^H */
5d382c25 1038 sv_setuv(sv, PL_hints);
a0d0e21e 1039 break;
9d116dd7 1040 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1041 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1042 break;
8561ea1d
FC
1043 case '\014': /* ^LAST_FH */
1044 if (strEQ(remaining, "AST_FH")) {
745e740c 1045 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1046 assert(isGV_with_GP(PL_last_in_gv));
1047 SV_CHECK_THINKFIRST_COW_DROP(sv);
1048 prepare_SV_for_RV(sv);
1049 SvOK_off(sv);
1050 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1051 SvROK_on(sv);
1052 sv_rvweaken(sv);
1053 }
3773545d
DM
1054 else
1055 sv_set_undef(sv);
8561ea1d
FC
1056 }
1057 break;
ac27b0f5 1058 case '\017': /* ^O & ^OPEN */
823a54a3 1059 if (nextchar == '\0') {
ac27b0f5 1060 sv_setpv(sv, PL_osname);
3511154c
DM
1061 SvTAINTED_off(sv);
1062 }
823a54a3 1063 else if (strEQ(remaining, "PEN")) {
8b850bd5 1064 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1065 }
28f23441 1066 break;
9ebf26ad 1067 case '\020':
a6d0b1b5 1068 sv_setiv(sv, (IV)PL_perldb);
79072805 1069 break;
fb73857a 1070 case '\023': /* ^S */
f512d242 1071 if (nextchar == '\0') {
bc177e6b 1072 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1073 SvOK_off(sv);
3280af22 1074 else if (PL_in_eval)
6dc8a9e4 1075 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1076 else
1077 sv_setiv(sv, 0);
d58bf5aa 1078 }
f512d242
KW
1079 else if (strEQ(remaining, "AFE_LOCALES")) {
1080
1081#if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1082
1083 sv_setuv(sv, (UV) 1);
1084
1085#else
1086 sv_setuv(sv, (UV) 0);
1087
1088#endif
1089
1090 }
fb73857a 1091 break;
79072805 1092 case '\024': /* ^T */
823a54a3 1093 if (nextchar == '\0') {
88e89b8a 1094#ifdef BIG_TIME
7c36658b 1095 sv_setnv(sv, PL_basetime);
88e89b8a 1096#else
7c36658b 1097 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1098#endif
7c36658b 1099 }
823a54a3 1100 else if (strEQ(remaining, "AINT"))
284167a5
SM
1101 sv_setiv(sv, TAINTING_get
1102 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1103 : 0);
7c36658b 1104 break;
e07ea26a 1105 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1106 if (strEQ(remaining, "NICODE"))
a05d7ebb 1107 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1108 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1109 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1110 else if (strEQ(remaining, "TF8CACHE"))
1111 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1112 break;
1113 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1114 if (nextchar == '\0')
8298454c 1115 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1116 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1117 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1118 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1119 }
1120 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1121 goto set_undef;
013b78e8 1122 }
d3a7d8c7 1123 else if (PL_compiling.cop_warnings == pWARN_ALL) {
006c1a1d 1124 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1125 }
4438c4b7 1126 else {
72dc9ed5
NC
1127 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1128 *PL_compiling.cop_warnings);
ac27b0f5 1129 }
4438c4b7 1130 }
8ca2a5d6
DD
1131#ifdef WIN32
1132 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1133 sv_setiv(sv, w32_sloppystat);
1134 }
1135#endif
79072805 1136 break;
79072805 1137 case '+':
aaa362c4 1138 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1139 paren = RX_LASTPAREN(rx);
1140 if (paren)
1141 goto do_numbuf_fetch;
79072805 1142 }
e03e82a0 1143 goto set_undef;
a01268b5
JH
1144 case '\016': /* ^N */
1145 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1146 paren = RX_LASTCLOSEPAREN(rx);
1147 if (paren)
1148 goto do_numbuf_fetch;
a01268b5 1149 }
e03e82a0 1150 goto set_undef;
79072805 1151 case '.':
3280af22 1152 if (GvIO(PL_last_in_gv)) {
357c8808 1153 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1154 }
79072805
LW
1155 break;
1156 case '?':
809a5acc 1157 {
809a5acc 1158 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1159#ifdef COMPLEX_STATUS
41cb7b2b 1160 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1161 LvTARGOFF(sv) = PL_statusvalue;
1162 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1163#endif
809a5acc 1164 }
79072805
LW
1165 break;
1166 case '^':
acbe1b9d 1167 if (GvIOp(PL_defoutgv))
099be4f1 1168 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1169 if (s)
1170 sv_setpv(sv,s);
1171 else {
3280af22 1172 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1173 sv_catpvs(sv,"_TOP");
79072805
LW
1174 }
1175 break;
1176 case '~':
acbe1b9d 1177 if (GvIOp(PL_defoutgv))
0daa599b 1178 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1179 if (!s)
3280af22 1180 s = GvENAME(PL_defoutgv);
79072805
LW
1181 sv_setpv(sv,s);
1182 break;
79072805 1183 case '=':
099be4f1 1184 if (GvIO(PL_defoutgv))
0daa599b 1185 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1186 break;
1187 case '-':
099be4f1 1188 if (GvIO(PL_defoutgv))
0daa599b 1189 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1190 break;
1191 case '%':
099be4f1 1192 if (GvIO(PL_defoutgv))
0daa599b 1193 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1194 break;
79072805 1195 case ':':
79072805
LW
1196 case '/':
1197 break;
1198 case '[':
e1dccc0d 1199 sv_setiv(sv, 0);
79072805
LW
1200 break;
1201 case '|':
099be4f1 1202 if (GvIO(PL_defoutgv))
0daa599b 1203 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1204 break;
79072805 1205 case '\\':
b2ce0fda 1206 if (PL_ors_sv)
f28098ff 1207 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1208 else
e03e82a0 1209 goto set_undef;
79072805 1210 break;
0e219455 1211 case '$': /* $$ */
9cdac2a2
FC
1212 {
1213 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1214 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1215 /* never set manually, or at least not since last fork */
1216 sv_setiv(sv, pid);
19db9fb7
Z
1217 /* never unsafe, even if reading in a tainted expression */
1218 SvTAINTED_off(sv);
1219 }
9cdac2a2
FC
1220 /* else a value has been assigned manually, so do nothing */
1221 }
0e219455 1222 break;
79072805 1223 case '<':
dfff4baf 1224 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1225 break;
1226 case '>':
dfff4baf 1227 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1228 break;
1229 case '(':
dfff4baf 1230 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1231 goto add_groups;
1232 case ')':
dfff4baf 1233 sv_setgid(sv, PerlProc_getegid());
79072805 1234 add_groups:
79072805 1235#ifdef HAS_GETGROUPS
79072805 1236 {
57d7c65e 1237 Groups_t *gary = NULL;
375ed12a
JH
1238 I32 num_groups = getgroups(0, gary);
1239 if (num_groups > 0) {
19742f39 1240 I32 i;
375ed12a
JH
1241 Newx(gary, num_groups, Groups_t);
1242 num_groups = getgroups(num_groups, gary);
1243 for (i = 0; i < num_groups; i++)
147e3846 1244 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1245 Safefree(gary);
1246 }
79072805 1247 }
155aba94 1248 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1249#endif
79072805 1250 break;
79072805
LW
1251 case '0':
1252 break;
1253 }
a0d0e21e 1254 return 0;
e03e82a0
DM
1255
1256 set_undef:
1257 sv_set_undef(sv);
1258 return 0;
79072805
LW
1259}
1260
1261int
864dbfa3 1262Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1263{
8772537c 1264 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1265
7918f24d
NC
1266 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1267
79072805 1268 if (uf && uf->uf_val)
24f81a43 1269 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1270 return 0;
1271}
1272
1273int
864dbfa3 1274Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1275{
9ae3433d 1276 STRLEN len = 0, klen;
12033064 1277 const char * const key = MgPV_const(mg,klen);
888a67f6 1278 const char *s = "";
1e422769 1279
7918f24d
NC
1280 PERL_ARGS_ASSERT_MAGIC_SETENV;
1281
613c63b4 1282 SvGETMAGIC(sv);
12033064 1283 if (SvOK(sv)) {
613c63b4
CS
1284 /* defined environment variables are byte strings; unfortunately
1285 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1286 (void)SvPV_force_nomg_nolen(sv);
1287 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1288 if (SvUTF8(sv)) {
1289 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1290 SvUTF8_off(sv);
1291 }
1292 s = SvPVX(sv);
1293 len = SvCUR(sv);
12033064
CS
1294 }
1295 my_setenv(key, s); /* does the deed */
1296
a0d0e21e
LW
1297#ifdef DYNAMIC_ENV_FETCH
1298 /* We just undefd an environment var. Is a replacement */
1299 /* waiting in the wings? */
1300 if (!len) {
6bd66ee9 1301 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1302 if (valp)
4ab59fcc 1303 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1304 }
1305#endif
1e422769 1306
28542d8f 1307#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1308 /* And you'll never guess what the dog had */
1309 /* in its mouth... */
284167a5 1310 if (TAINTING_get) {
1e422769
PP
1311 MgTAINTEDDIR_off(mg);
1312#ifdef VMS
b2aed775 1313 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1314 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1315 int i = 0, j = 0;
1316
6fca0082 1317 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1318 elt = eltbuf;
1e422769
PP
1319 do { /* DCL$PATH may be a search list */
1320 while (1) { /* as may dev portion of any element */
1321 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1322 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1323 cando_by_name(S_IWUSR,0,elt) ) {
1324 MgTAINTEDDIR_on(mg);
1325 return 0;
1326 }
1327 }
bd61b366 1328 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1329 *cp = '\0';
1330 if (my_trnlnm(elt, eltbuf, j++))
1331 elt = eltbuf;
1332 else
1333 break;
1334 }
1335 j = 0;
1336 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1337 }
1338#endif /* VMS */
b2aed775 1339 if (s && memEQs(key, klen, "PATH")) {
8772537c 1340 const char * const strend = s + len;
463ee0b2 1341
70b484a8
DM
1342 /* set MGf_TAINTEDDIR if any component of the new path is
1343 * relative or world-writeable */
463ee0b2 1344 while (s < strend) {
96827780 1345 char tmpbuf[256];
c623ac67 1346 Stat_t st;
5f74f29c 1347 I32 i;
83269ced
CB
1348#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1349 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1350#else
1351 const char path_sep = ':';
1352#endif
ba0a4150 1353 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1354 s, strend, path_sep, &i);
463ee0b2 1355 s++;
bb7a0f54 1356 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1357#ifdef __VMS
1358 /* no colon thus no device name -- assume relative path */
1359 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1360 /* Using Unix separator, e.g. under bash, so act line Unix */
1361 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1362#else
1363 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1364#endif
c6ed36e1 1365 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1366 MgTAINTEDDIR_on(mg);
1e422769
PP
1367 return 0;
1368 }
463ee0b2 1369 }
79072805
LW
1370 }
1371 }
28542d8f 1372#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1373
79072805
LW
1374 return 0;
1375}
1376
1377int
864dbfa3 1378Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1379{
7918f24d 1380 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1381 PERL_UNUSED_ARG(sv);
bd61b366 1382 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1383 return 0;
1384}
1385
88e89b8a 1386int
864dbfa3 1387Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1388{
7918f24d 1389 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1390 PERL_UNUSED_ARG(mg);
b0269e46 1391#if defined(VMS)
cea2e8a9 1392 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1393#else
3280af22 1394 if (PL_localizing) {
fb73857a 1395 HE* entry;
b0269e46 1396 my_clearenv();
85fbaab2
NC
1397 hv_iterinit(MUTABLE_HV(sv));
1398 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1399 I32 keylen;
1400 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1401 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1402 }
1403 }
1404#endif
1405 return 0;
1406}
1407
1408int
864dbfa3 1409Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1410{
7918f24d 1411 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1412 PERL_UNUSED_ARG(sv);
1413 PERL_UNUSED_ARG(mg);
b0269e46
AB
1414#if defined(VMS)
1415 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1416#else
1417 my_clearenv();
1418#endif
3e3baf6d 1419 return 0;
66b1d557
HM
1420}
1421
64ca3a65 1422#ifndef PERL_MICRO
2d4fcd5e
AJ
1423#ifdef HAS_SIGPROCMASK
1424static void
1425restore_sigmask(pTHX_ SV *save_sv)
1426{
0bd48802 1427 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1428 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1429}
1430#endif
66b1d557 1431int
864dbfa3 1432Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1433{
88e89b8a 1434 /* Are we fetching a signal entry? */
708854f2 1435 int i = (I16)mg->mg_private;
7918f24d
NC
1436
1437 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1438
708854f2 1439 if (!i) {
84c7b88c
BF
1440 STRLEN siglen;
1441 const char * sig = MgPV_const(mg, siglen);
1442 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1443 }
1444
e02bfb16 1445 if (i > 0) {
22c35a8c
GS
1446 if(PL_psig_ptr[i])
1447 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1448 else {
46da273f 1449 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1450#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1451 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1452 sigstate = SIG_IGN;
2e34cc90
CL
1453#endif
1454#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1455 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1456 sigstate = SIG_DFL;
85b332e2 1457#endif
88e89b8a 1458 /* cache state so we don't fetch it again */
8aad04aa 1459 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1460 sv_setpvs(sv,"IGNORE");
88e89b8a 1461 else
e03e82a0 1462 sv_set_undef(sv);
46da273f 1463 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1464 SvTEMP_off(sv);
1465 }
1466 }
1467 return 0;
1468}
1469int
864dbfa3 1470Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1471{
7918f24d 1472 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1473
38a124f0 1474 magic_setsig(NULL, mg);
179c85a2 1475 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1476}
3d37d572 1477
0a8e0eff 1478Signal_t
8aad04aa 1479#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1480Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1481#else
0a8e0eff 1482Perl_csighandler(int sig)
8aad04aa 1483#endif
0a8e0eff 1484{
1018e26f
NIS
1485#ifdef PERL_GET_SIG_CONTEXT
1486 dTHXa(PERL_GET_SIG_CONTEXT);
1487#else
85b332e2
CL
1488 dTHX;
1489#endif
1271a1be 1490#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1491#if defined(__cplusplus) && defined(__GNUC__)
1492 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1493 * parameters would be warned about. */
1494 PERL_UNUSED_ARG(sip);
1495 PERL_UNUSED_ARG(uap);
1496#endif
1271a1be 1497#endif
23ada85b 1498#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1499 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1500 if (PL_sig_ignoring[sig]) return;
85b332e2 1501#endif
2e34cc90 1502#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1503 if (PL_sig_defaulting[sig])
2e34cc90
CL
1504#ifdef KILL_BY_SIGPRC
1505 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1506#else
1507 exit(1);
1508#endif
1509#endif
406878dd 1510 if (
853d2c32
RGS
1511#ifdef SIGILL
1512 sig == SIGILL ||
1513#endif
1514#ifdef SIGBUS
1515 sig == SIGBUS ||
1516#endif
1517#ifdef SIGSEGV
1518 sig == SIGSEGV ||
1519#endif
1520 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1521 /* Call the perl level handler now--
31c91b43 1522 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1523#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1524 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1525#else
1526 (*PL_sighandlerp)(sig);
92807b6d 1527#endif
406878dd 1528 else {
31c91b43 1529 if (!PL_psig_pend) return;
406878dd
GA
1530 /* Set a flag to say this signal is pending, that is awaiting delivery after
1531 * the current Perl opcode completes */
1532 PL_psig_pend[sig]++;
1533
1534#ifndef SIG_PENDING_DIE_COUNT
1535# define SIG_PENDING_DIE_COUNT 120
1536#endif
fe13d51d 1537 /* Add one to say _a_ signal is pending */
406878dd
GA
1538 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1539 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1540 (unsigned long)SIG_PENDING_DIE_COUNT);
1541 }
0a8e0eff
NIS
1542}
1543
2e34cc90
CL
1544#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1545void
1546Perl_csighandler_init(void)
1547{
1548 int sig;
27da23d5 1549 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1550
1551 for (sig = 1; sig < SIG_SIZE; sig++) {
1552#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1553 dTHX;
27da23d5 1554 PL_sig_defaulting[sig] = 1;
5c1546dc 1555 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1556#endif
1557#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1558 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1559#endif
1560 }
27da23d5 1561 PL_sig_handlers_initted = 1;
2e34cc90
CL
1562}
1563#endif
1564
7fe50b8b
LT
1565#if defined HAS_SIGPROCMASK
1566static void
1567unblock_sigmask(pTHX_ void* newset)
1568{
dc3bf405 1569 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1570 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1571}
1572#endif
1573
0a8e0eff
NIS
1574void
1575Perl_despatch_signals(pTHX)
1576{
1577 int sig;
1578 PL_sig_pending = 0;
1579 for (sig = 1; sig < SIG_SIZE; sig++) {
1580 if (PL_psig_pend[sig]) {
d0166017 1581 dSAVE_ERRNO;
7fe50b8b 1582#ifdef HAS_SIGPROCMASK
55534442
LT
1583 /* From sigaction(2) (FreeBSD man page):
1584 * | Signal routines normally execute with the signal that
1585 * | caused their invocation blocked, but other signals may
1586 * | yet occur.
1587 * Emulation of this behavior (from within Perl) is enabled
1588 * using sigprocmask
1589 */
1590 int was_blocked;
1591 sigset_t newset, oldset;
1592
1593 sigemptyset(&newset);
1594 sigaddset(&newset, sig);
1595 sigprocmask(SIG_BLOCK, &newset, &oldset);
1596 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1597 if (!was_blocked) {
1598 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1599 ENTER;
1600 SAVEFREESV(save_sv);
1601 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1602 }
55534442 1603#endif
25da4428 1604 PL_psig_pend[sig] = 0;
6e324d09 1605#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1606 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1607#else
1608 (*PL_sighandlerp)(sig);
92807b6d 1609#endif
7fe50b8b 1610#ifdef HAS_SIGPROCMASK
55534442 1611 if (!was_blocked)
7fe50b8b 1612 LEAVE;
55534442 1613#endif
d0166017 1614 RESTORE_ERRNO;
0a8e0eff
NIS
1615 }
1616 }
1617}
1618
38a124f0 1619/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1620int
864dbfa3 1621Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1622{
27da23d5 1623 dVAR;
79072805 1624 I32 i;
cbbf8932 1625 SV** svp = NULL;
2d4fcd5e
AJ
1626 /* Need to be careful with SvREFCNT_dec(), because that can have side
1627 * effects (due to closures). We must make sure that the new disposition
1628 * is in place before it is called.
1629 */
cbbf8932 1630 SV* to_dec = NULL;
e72dc28c 1631 STRLEN len;
2d4fcd5e
AJ
1632#ifdef HAS_SIGPROCMASK
1633 sigset_t set, save;
1634 SV* save_sv;
1635#endif
eb578fdb 1636 const char *s = MgPV_const(mg,len);
7918f24d
NC
1637
1638 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1639
748a9306 1640 if (*s == '_') {
84c7b88c 1641 if (memEQs(s, len, "__DIE__"))
3280af22 1642 svp = &PL_diehook;
84c7b88c 1643 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1644 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1645 /* Merge the existing behaviours, which are as follows:
1646 magic_setsig, we always set svp to &PL_warnhook
1647 (hence we always change the warnings handler)
1648 For magic_clearsig, we don't change the warnings handler if it's
1649 set to the &PL_warnhook. */
3280af22 1650 svp = &PL_warnhook;
84c7b88c
BF
1651 } else if (sv) {
1652 SV *tmp = sv_newmortal();
1653 Perl_croak(aTHX_ "No such hook: %s",
1654 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1655 }
748a9306 1656 i = 0;
38a124f0 1657 if (svp && *svp) {
9289f461
RGS
1658 if (*svp != PERL_WARNHOOK_FATAL)
1659 to_dec = *svp;
cbbf8932 1660 *svp = NULL;
4633a7c4 1661 }
748a9306
LW
1662 }
1663 else {
708854f2
NC
1664 i = (I16)mg->mg_private;
1665 if (!i) {
84c7b88c 1666 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1667 mg->mg_private = (U16)i;
708854f2 1668 }
86d86cad 1669 if (i <= 0) {
84c7b88c
BF
1670 if (sv) {
1671 SV *tmp = sv_newmortal();
1672 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1673 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1674 }
748a9306
LW
1675 return 0;
1676 }
2d4fcd5e
AJ
1677#ifdef HAS_SIGPROCMASK
1678 /* Avoid having the signal arrive at a bad time, if possible. */
1679 sigemptyset(&set);
1680 sigaddset(&set,i);
1681 sigprocmask(SIG_BLOCK, &set, &save);
1682 ENTER;
9ff8e806 1683 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1684 SAVEFREESV(save_sv);
1685 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1686#endif
1687 PERL_ASYNC_CHECK();
2e34cc90 1688#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1689 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1690#endif
23ada85b 1691#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1692 PL_sig_ignoring[i] = 0;
85b332e2 1693#endif
2e34cc90 1694#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1695 PL_sig_defaulting[i] = 0;
2e34cc90 1696#endif
2d4fcd5e 1697 to_dec = PL_psig_ptr[i];
38a124f0
NC
1698 if (sv) {
1699 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1700 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1701
1702 /* Signals don't change name during the program's execution, so once
1703 they're cached in the appropriate slot of PL_psig_name, they can
1704 stay there.
1705
1706 Ideally we'd find some way of making SVs at (C) compile time, or
1707 at least, doing most of the work. */
1708 if (!PL_psig_name[i]) {
1709 PL_psig_name[i] = newSVpvn(s, len);
1710 SvREADONLY_on(PL_psig_name[i]);
1711 }
38a124f0 1712 } else {
79fd3822 1713 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1714 PL_psig_name[i] = NULL;
1715 PL_psig_ptr[i] = NULL;
1716 }
748a9306 1717 }
38a124f0 1718 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1719 if (i) {
5c1546dc 1720 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1721 }
748a9306 1722 else
b37c2d43 1723 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1724 } else {
9dfa190b
NC
1725 if (sv && SvOK(sv)) {
1726 s = SvPV_force(sv, len);
1727 } else {
1728 sv = NULL;
1729 }
84c7b88c 1730 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1731 if (i) {
23ada85b 1732#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1733 PL_sig_ignoring[i] = 1;
1734 (void)rsignal(i, PL_csighandlerp);
85b332e2 1735#else
9dfa190b 1736 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1737#endif
9dfa190b 1738 }
2d4fcd5e 1739 }
84c7b88c 1740 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1741 if (i) {
2e34cc90 1742#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1743 PL_sig_defaulting[i] = 1;
1744 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1745#else
9dfa190b 1746 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1747#endif
9dfa190b
NC
1748 }
1749 }
1750 else {
1751 /*
1752 * We should warn if HINT_STRICT_REFS, but without
1753 * access to a known hint bit in a known OP, we can't
1754 * tell whether HINT_STRICT_REFS is in force or not.
1755 */
0687887e 1756 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1757 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1758 SV_GMAGIC);
1759 if (i)
1760 (void)rsignal(i, PL_csighandlerp);
1761 else
1762 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1763 }
748a9306 1764 }
9dfa190b 1765
2d4fcd5e
AJ
1766#ifdef HAS_SIGPROCMASK
1767 if(i)
1768 LEAVE;
1769#endif
ef8d46e8 1770 SvREFCNT_dec(to_dec);
79072805
LW
1771 return 0;
1772}
64ca3a65 1773#endif /* !PERL_MICRO */
79072805
LW
1774
1775int
864dbfa3 1776Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1777{
7918f24d 1778 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1779 PERL_UNUSED_ARG(sv);
e1a479c5 1780
89c14e2e 1781 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1782 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1783 return 0;
1784
0e446081 1785 return magic_clearisa(NULL, mg);
463ee0b2
LW
1786}
1787
0e446081 1788/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1789int
52b45067
RD
1790Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1791{
52b45067 1792 HV* stash;
7918f24d
NC
1793 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1794
52b45067 1795 /* Bail out if destruction is going on */
627364f1 1796 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1797
0e446081
NC
1798 if (sv)
1799 av_clear(MUTABLE_AV(sv));
52b45067 1800
6624142a
FC
1801 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1802 /* This occurs with setisa_elem magic, which calls this
1803 same function. */
1804 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1805
316ebaf2 1806 assert(mg);
6624142a
FC
1807 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1808 SV **svp = AvARRAY((AV *)mg->mg_obj);
1809 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1810 while (items--) {
1811 stash = GvSTASH((GV *)*svp++);
1812 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1813 }
1814
1815 return 0;
1816 }
1817
52b45067 1818 stash = GvSTASH(
6624142a 1819 (const GV *)mg->mg_obj
52b45067
RD
1820 );
1821
00169e2c
FC
1822 /* The stash may have been detached from the symbol table, so check its
1823 name before doing anything. */
1824 if (stash && HvENAME_get(stash))
5562fa71 1825 mro_isa_changed_in(stash);
52b45067
RD
1826
1827 return 0;
1828}
1829
1830int
864dbfa3 1831Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1832{
85fbaab2 1833 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1834 I32 i = 0;
7918f24d
NC
1835
1836 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1837 PERL_UNUSED_ARG(mg);
7719e241 1838
6ff81951 1839 if (hv) {
497b47a8 1840 (void) hv_iterinit(hv);
ad64d0ec 1841 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1842 i = HvUSEDKEYS(hv);
497b47a8
JH
1843 else {
1844 while (hv_iternext(hv))
1845 i++;
1846 }
6ff81951
GS
1847 }
1848
1849 sv_setiv(sv, (IV)i);
1850 return 0;
1851}
1852
1853int
864dbfa3 1854Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1855{
7918f24d 1856 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1857 PERL_UNUSED_ARG(mg);
946ec16e 1858 if (LvTARG(sv)) {
85fbaab2 1859 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1860 }
1861 return 0;
ac27b0f5 1862}
946ec16e 1863
efaf3674
DM
1864/*
1865=for apidoc magic_methcall
1866
1867Invoke a magic method (like FETCH).
1868
2baee27b
FC
1869C<sv> and C<mg> are the tied thingy and the tie magic.
1870
1871C<meth> is the name of the method to call.
1872
1873C<argc> is the number of args (in addition to $self) to pass to the method.
1874
1875The C<flags> can be:
1876
1877 G_DISCARD invoke method with G_DISCARD flag and don't
1878 return a value
1879 G_UNDEF_FILL fill the stack with argc pointers to
1880 PL_sv_undef
1881
1882The arguments themselves are any values following the C<flags> argument.
efaf3674 1883
796b6530 1884Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1885
1886
1887=cut
1888*/
1889
1890SV*
36925d9e 1891Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1892 U32 argc, ...)
a0d0e21e
LW
1893{
1894 dSP;
efaf3674 1895 SV* ret = NULL;
463ee0b2 1896
7918f24d
NC
1897 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1898
efaf3674 1899 ENTER;
d1d7a15d
NC
1900
1901 if (flags & G_WRITING_TO_STDERR) {
1902 SAVETMPS;
1903
2782061f 1904 save_re_context();
d1d7a15d
NC
1905 SAVESPTR(PL_stderrgv);
1906 PL_stderrgv = NULL;
1907 }
1908
efaf3674 1909 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1910 PUSHMARK(SP);
efaf3674 1911
052a7c76
DM
1912 /* EXTEND() expects a signed argc; don't wrap when casting */
1913 assert(argc <= I32_MAX);
1914 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1915 PUSHs(SvTIED_obj(sv, mg));
1916 if (flags & G_UNDEF_FILL) {
1917 while (argc--) {
efaf3674 1918 PUSHs(&PL_sv_undef);
93965878 1919 }
67549bd2 1920 } else if (argc > 0) {
046b0c7d
NC
1921 va_list args;
1922 va_start(args, argc);
1923
1924 do {
1925 SV *const sv = va_arg(args, SV *);
1926 PUSHs(sv);
1927 } while (--argc);
1928
1929 va_end(args);
88e89b8a 1930 }
463ee0b2 1931 PUTBACK;
efaf3674 1932 if (flags & G_DISCARD) {
36925d9e 1933 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1934 }
1935 else {
36925d9e 1936 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1937 ret = *PL_stack_sp--;
1938 }
1939 POPSTACK;
d1d7a15d
NC
1940 if (flags & G_WRITING_TO_STDERR)
1941 FREETMPS;
efaf3674
DM
1942 LEAVE;
1943 return ret;
1944}
1945
efaf3674 1946/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1947
efaf3674 1948STATIC SV*
36925d9e 1949S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1950 int n, SV *val)
1951{
efaf3674
DM
1952 SV* arg1 = NULL;
1953
1954 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1955
1956 if (mg->mg_ptr) {
1957 if (mg->mg_len >= 0) {
db4b3a1d 1958 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1959 }
1960 else if (mg->mg_len == HEf_SVKEY)
1961 arg1 = MUTABLE_SV(mg->mg_ptr);
1962 }
1963 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1964 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1965 sv_2mortal(arg1);
1966 }
1967 if (!arg1) {
046b0c7d 1968 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1969 }
046b0c7d 1970 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1971}
1972
76e3520e 1973STATIC int
36925d9e 1974S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1975{
efaf3674 1976 SV* ret;
463ee0b2 1977
7918f24d
NC
1978 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1979
efaf3674
DM
1980 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1981 if (ret)
1982 sv_setsv(sv, ret);
a0d0e21e
LW
1983 return 0;
1984}
463ee0b2 1985
a0d0e21e 1986int
864dbfa3 1987Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1988{
7918f24d
NC
1989 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1990
fd69380d 1991 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1992 mg->mg_flags |= MGf_GSKIP;
36925d9e 1993 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1994 return 0;
1995}
1996
1997int
864dbfa3 1998Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1999{
b112cff9
DM
2000 MAGIC *tmg;
2001 SV *val;
7918f24d
NC
2002
2003 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2004
b112cff9
DM
2005 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2006 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2007 * public flags indicate its value based on copying from $val. Doing
2008 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2009 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2010 * wrong if $val happened to be tainted, as sv hasn't got magic
2011 * enabled, even though taint magic is in the chain. In which case,
2012 * fake up a temporary tainted value (this is easier than temporarily
2013 * re-enabling magic on sv). */
2014
284167a5 2015 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2016 && (tmg->mg_len & 1))
2017 {
2018 val = sv_mortalcopy(sv);
2019 SvTAINTED_on(val);
2020 }
2021 else
2022 val = sv;
2023
36925d9e 2024 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2025 return 0;
2026}
2027
2028int
864dbfa3 2029Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2030{
7918f24d
NC
2031 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2032
4c13be3f 2033 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2034 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2035}
463ee0b2 2036
93965878
NIS
2037
2038U32
864dbfa3 2039Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2040{
22846ab4 2041 I32 retval = 0;
efaf3674 2042 SV* retsv;
93965878 2043
7918f24d
NC
2044 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2045
36925d9e 2046 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2047 if (retsv) {
2048 retval = SvIV(retsv)-1;
22846ab4
AB
2049 if (retval < -1)
2050 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2051 }
22846ab4 2052 return (U32) retval;
93965878
NIS
2053}
2054
cea2e8a9
GS
2055int
2056Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2057{
7918f24d
NC
2058 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2059
36925d9e 2060 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2061 return 0;
2062}
2063
2064int
864dbfa3 2065Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2066{
efaf3674 2067 SV* ret;
463ee0b2 2068
7918f24d
NC
2069 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2070
36925d9e
RZ
2071 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2072 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2073 if (ret)
2074 sv_setsv(key,ret);
79072805
LW
2075 return 0;
2076}
2077
2078int
1146e912 2079Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2080{
7918f24d
NC
2081 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2082
36925d9e 2083 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2084}
a0d0e21e 2085
a3bcc51e
TP
2086SV *
2087Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2088{
5fcbf73d 2089 SV *retval;
ad64d0ec
NC
2090 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2091 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2092
7918f24d
NC
2093 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2094
a3bcc51e
TP
2095 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2096 SV *key;
bfcb3514 2097 if (HvEITER_get(hv))
a3bcc51e
TP
2098 /* we are in an iteration so the hash cannot be empty */
2099 return &PL_sv_yes;
2100 /* no xhv_eiter so now use FIRSTKEY */
2101 key = sv_newmortal();
ad64d0ec 2102 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2103 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2104 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2105 }
2106
2107 /* there is a SCALAR method that we can call */
36925d9e 2108 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2109 if (!retval)
5fcbf73d 2110 retval = &PL_sv_undef;
a3bcc51e
TP
2111 return retval;
2112}
2113
a0d0e21e 2114int
864dbfa3 2115Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2116{
089b5c60 2117 SV **svp;
7918f24d
NC
2118
2119 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2120
089b5c60
NC
2121 /* The magic ptr/len for the debugger's hash should always be an SV. */
2122 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2123 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2124 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2125 }
2126
2127 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2128 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2129 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2130 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2131
8772537c 2132 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2133 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2134 if (o) {
2135#ifdef PERL_DEBUG_READONLY_OPS
2136 Slab_to_rw(OpSLAB(o));
2137#endif
2138 /* set or clear breakpoint in the relevant control op */
089b5c60 2139 if (SvTRUE(sv))
88df5f01 2140 o->op_flags |= OPf_SPECIAL;
8772537c 2141 else
88df5f01
FC
2142 o->op_flags &= ~OPf_SPECIAL;
2143#ifdef PERL_DEBUG_READONLY_OPS
2144 Slab_to_ro(OpSLAB(o));
2145#endif
8772537c 2146 }
5df8de69 2147 }
79072805
LW
2148 return 0;
2149}
2150
2151int
8772537c 2152Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2153{
502c6561 2154 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2155
2156 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2157
83bf042f 2158 if (obj) {
e1dccc0d 2159 sv_setiv(sv, AvFILL(obj));
83bf042f 2160 } else {
3773545d 2161 sv_set_undef(sv);
83bf042f 2162 }
79072805
LW
2163 return 0;
2164}
2165
2166int
864dbfa3 2167Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2168{
502c6561 2169 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2170
2171 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2172
83bf042f 2173 if (obj) {
e1dccc0d 2174 av_fill(obj, SvIV(sv));
83bf042f 2175 } else {
a2a5de95
NC
2176 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2177 "Attempt to set length of freed array");
83bf042f
NC
2178 }
2179 return 0;
2180}
2181
2182int
83f29afa
VP
2183Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2184{
83f29afa
VP
2185 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2186 PERL_UNUSED_ARG(sv);
dc3bf405 2187 PERL_UNUSED_CONTEXT;
83f29afa
VP
2188
2189 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2190 if (sizeof(IV) == sizeof(SSize_t)) {
2191 *((IV *) &(mg->mg_len)) = 0;
2192 } else {
2193 if (mg->mg_ptr)
2194 *((IV *) mg->mg_ptr) = 0;
2195 }
83f29afa
VP
2196
2197 return 0;
2198}
2199
2200int
83bf042f
NC
2201Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2202{
7918f24d 2203 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2204 PERL_UNUSED_ARG(sv);
7918f24d 2205
94f3782b
DM
2206 /* during global destruction, mg_obj may already have been freed */
2207 if (PL_in_clean_all)
1ea47f64 2208 return 0;
94f3782b 2209
83bf042f
NC
2210 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2211
2212 if (mg) {
2213 /* arylen scalar holds a pointer back to the array, but doesn't own a
2214 reference. Hence the we (the array) are about to go away with it
2215 still pointing at us. Clear its pointer, else it would be pointing
2216 at free memory. See the comment in sv_magic about reference loops,
2217 and why it can't own a reference to us. */
2218 mg->mg_obj = 0;
2219 }
a0d0e21e
LW
2220 return 0;
2221}
2222
2223int
864dbfa3 2224Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2225{
16eb5365 2226 SV* const lsv = LvTARG(sv);
96c2a8ff 2227 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2228
2229 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2230 PERL_UNUSED_ARG(mg);
ac27b0f5 2231
6174b39a
FC
2232 if (found && found->mg_len != -1) {
2233 STRLEN i = found->mg_len;
25fdce4a 2234 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2235 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2236 sv_setuv(sv, i);
a0d0e21e 2237 return 0;
a0d0e21e 2238 }
3773545d 2239 sv_set_undef(sv);
a0d0e21e
LW
2240 return 0;
2241}
2242
2243int
864dbfa3 2244Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2245{
16eb5365 2246 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2247 SSize_t pos;
2248 STRLEN len;
53d44271 2249 MAGIC* found;
aec43834 2250 const char *s;
a0d0e21e 2251
7918f24d 2252 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2253 PERL_UNUSED_ARG(mg);
ac27b0f5 2254
96c2a8ff 2255 found = mg_find_mglob(lsv);
3881461a 2256 if (!found) {
a0d0e21e
LW
2257 if (!SvOK(sv))
2258 return 0;
96c2a8ff 2259 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2260 }
2261 else if (!SvOK(sv)) {
3881461a 2262 found->mg_len = -1;
a0d0e21e
LW
2263 return 0;
2264 }
aec43834 2265 s = SvPV_const(lsv, len);
a0d0e21e 2266
e1dccc0d 2267 pos = SvIV(sv);
a0ed51b3 2268
7e2040f0 2269 if (DO_UTF8(lsv)) {
19742f39 2270 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2271 if (ulen)
2272 len = ulen;
a0ed51b3
LW
2273 }
2274
a0d0e21e
LW
2275 if (pos < 0) {
2276 pos += len;
2277 if (pos < 0)
2278 pos = 0;
2279 }
eb160463 2280 else if (pos > (SSize_t)len)
a0d0e21e 2281 pos = len;
a0ed51b3 2282
3881461a 2283 found->mg_len = pos;
25fdce4a 2284 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2285
79072805
LW
2286 return 0;
2287}
2288
2289int
864dbfa3 2290Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2291{
2292 STRLEN len;
35a4481c 2293 SV * const lsv = LvTARG(sv);
b83604b4 2294 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2295 STRLEN offs = LvTARGOFF(sv);
2296 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2297 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2298 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2299
2300 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2301 PERL_UNUSED_ARG(mg);
6ff81951 2302
83f78d1a 2303 if (!translate_substr_offsets(
4ddea69a 2304 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2305 negoff ? -(IV)offs : (IV)offs, !negoff,
2306 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2307 )) {
2308 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2309 sv_set_undef(sv);
83f78d1a
FC
2310 return 0;
2311 }
2312
9aa983d2 2313 if (SvUTF8(lsv))
4ddea69a 2314 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2315 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2316 if (SvUTF8(lsv))
2ef4b674 2317 SvUTF8_on(sv);
6ff81951
GS
2318 return 0;
2319}
2320
2321int
864dbfa3 2322Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2323{
83f78d1a 2324 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2325 const char * const tmps = SvPV_const(sv, len);
dd374669 2326 SV * const lsv = LvTARG(sv);
777f7c56
EB
2327 STRLEN lvoff = LvTARGOFF(sv);
2328 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2329 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2330 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2331
2332 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2333 PERL_UNUSED_ARG(mg);
075a4a2b 2334
a74fb2cd
FC
2335 SvGETMAGIC(lsv);
2336 if (SvROK(lsv))
2337 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2338 "Attempt to use reference as lvalue in substr"
2339 );
fc061ed8
FC
2340 SvPV_force_nomg(lsv,lsv_len);
2341 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2342 if (!translate_substr_offsets(
2343 lsv_len,
2344 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2345 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2346 ))
2347 Perl_croak(aTHX_ "substr outside of string");
2348 oldtarglen = lvlen;
1aa99e6b 2349 if (DO_UTF8(sv)) {
73a087f0 2350 sv_utf8_upgrade_nomg(lsv);
d931b1be 2351 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2352 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2353 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2354 SvUTF8_on(lsv);
2355 }
0d336106 2356 else if (SvUTF8(lsv)) {
5fcbf73d 2357 const char *utf8;
d931b1be 2358 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2359 newtarglen = len;
5fcbf73d 2360 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2361 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2362 Safefree(utf8);
1aa99e6b 2363 }
b76f3ce2 2364 else {
a74fb2cd 2365 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2366 newtarglen = len;
b76f3ce2 2367 }
83f78d1a
FC
2368 if (!neglen) LvTARGLEN(sv) = newtarglen;
2369 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2370
79072805
LW
2371 return 0;
2372}
2373
2374int
864dbfa3 2375Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2376{
7918f24d 2377 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2378 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2379#ifdef NO_TAINT_SUPPORT
2380 PERL_UNUSED_ARG(mg);
2381#endif
7918f24d 2382
64ff300b 2383 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2384 return 0;
2385}
2386
2387int
864dbfa3 2388Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2389{
7918f24d 2390 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2391 PERL_UNUSED_ARG(sv);
7918f24d 2392
b01e650a 2393 /* update taint status */
284167a5 2394 if (TAINT_get)
b01e650a
DM
2395 mg->mg_len |= 1;
2396 else
2397 mg->mg_len &= ~1;
463ee0b2
LW
2398 return 0;
2399}
2400
2401int
864dbfa3 2402Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2403{
35a4481c 2404 SV * const lsv = LvTARG(sv);
1b92e694 2405 char errflags = LvFLAGS(sv);
7918f24d
NC
2406
2407 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2408 PERL_UNUSED_ARG(mg);
6ff81951 2409
1b92e694 2410 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2411 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2412 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2413
6ff81951
GS
2414 return 0;
2415}
2416
2417int
864dbfa3 2418Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2419{
7918f24d 2420 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2421 PERL_UNUSED_ARG(mg);
79072805
LW
2422 do_vecset(sv); /* XXX slurp this routine */
2423 return 0;
2424}
2425
13733cde
FC
2426SV *
2427Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2428{
a0714e2c 2429 SV *targ = NULL;
13733cde
FC
2430 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2431 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2432 assert(mg);
5f05dabc 2433 if (LvTARGLEN(sv)) {
68dc0745 2434 if (mg->mg_obj) {
8772537c 2435 SV * const ahv = LvTARG(sv);
85fbaab2 2436 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2437 if (he)
2438 targ = HeVAL(he);
68dc0745 2439 }
bbfdc870 2440 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2441 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2442 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2443 {
2444 if (SvRMAGICAL(av)) {
2445 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2446 targ = svp ? *svp : NULL;
2447 }
2448 else
bbfdc870 2449 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2450 }
68dc0745 2451 }
46da273f 2452 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2453 /* somebody else defined it for us */
2454 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2455 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2456 LvTARGLEN(sv) = 0;
2457 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2458 mg->mg_obj = NULL;
68dc0745
PP
2459 mg->mg_flags &= ~MGf_REFCOUNTED;
2460 }
13733cde 2461 return targ;
5f05dabc 2462 }
71be2cbc 2463 else
13733cde
FC
2464 return LvTARG(sv);
2465}
2466
2467int
2468Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2469{
2470 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2471
2472 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2473 return 0;
2474}
2475
2476int
864dbfa3 2477Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2478{
7918f24d 2479 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2480 PERL_UNUSED_ARG(mg);
71be2cbc 2481 if (LvTARGLEN(sv))
68dc0745
PP
2482 vivify_defelem(sv);
2483 if (LvTARG(sv)) {
5f05dabc 2484 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2485 SvSETMAGIC(LvTARG(sv));
2486 }
5f05dabc
PP
2487 return 0;
2488}
2489
71be2cbc 2490void
864dbfa3 2491Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2492{
74e13ce4 2493 MAGIC *mg;
a0714e2c 2494 SV *value = NULL;
71be2cbc 2495
7918f24d
NC
2496 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2497
14befaf4 2498 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2499 return;
68dc0745 2500 if (mg->mg_obj) {
8772537c 2501 SV * const ahv = LvTARG(sv);
85fbaab2 2502 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2503 if (he)
2504 value = HeVAL(he);
3280af22 2505 if (!value || value == &PL_sv_undef)
be2597df 2506 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2507 }
bbfdc870
FC
2508 else if (LvSTARGOFF(sv) < 0)
2509 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2510 else {
502c6561 2511 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2512 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2513 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2514 else {
bbfdc870 2515 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2516 if (!svp || !(value = *svp))
bbfdc870 2517 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2518 }
2519 }
b37c2d43 2520 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2521 SvREFCNT_dec(LvTARG(sv));
2522 LvTARG(sv) = value;
71be2cbc 2523 LvTARGLEN(sv) = 0;
68dc0745 2524 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2525 mg->mg_obj = NULL;
68dc0745 2526 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2527}
2528
2529int
1f1dcfb5
FC
2530Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2531{
2532 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2533 PERL_UNUSED_ARG(mg);
2534 sv_unmagic(sv, PERL_MAGIC_nonelem);
2535 return 0;
2536}
2537
2538int
864dbfa3 2539Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2540{
7918f24d 2541 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2542 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2543 return 0;
810b8aa5
GS
2544}
2545
2546int
864dbfa3 2547Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2548{
7918f24d 2549 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2550 PERL_UNUSED_CONTEXT;
0177730e 2551 PERL_UNUSED_ARG(sv);
565764a8 2552 mg->mg_len = -1;
93a17b20
LW
2553 return 0;
2554}
2555
2556int
864dbfa3 2557Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2558{
35a4481c 2559 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2560
7918f24d
NC
2561 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2562
79072805 2563 if (uf && uf->uf_set)
24f81a43 2564 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2565 return 0;
2566}
2567
c277df42 2568int
faf82a0b
AE
2569Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2570{
488344d2 2571 const char type = mg->mg_type;
7918f24d
NC
2572
2573 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2574
a5c7cb08
DM
2575 assert( type == PERL_MAGIC_fm
2576 || type == PERL_MAGIC_qr
2577 || type == PERL_MAGIC_bm);
488344d2 2578 return sv_unmagic(sv, type);
faf82a0b
AE
2579}
2580
7a4c00b4 2581#ifdef USE_LOCALE_COLLATE
79072805 2582int
864dbfa3 2583Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2584{
7918f24d
NC
2585 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2586
bbce6d69 2587 /*
838b5b74 2588 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2589 * and vanished with a faint plop.
2590 */
96a5add6 2591 PERL_UNUSED_CONTEXT;
8772537c 2592 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2593 if (mg->mg_ptr) {
2594 Safefree(mg->mg_ptr);
2595 mg->mg_ptr = NULL;
565764a8 2596 mg->mg_len = -1;
7a4c00b4 2597 }
bbce6d69
PP
2598 return 0;
2599}
7a4c00b4 2600#endif /* USE_LOCALE_COLLATE */
bbce6d69 2601
7e8c5dac
HS
2602/* Just clear the UTF-8 cache data. */
2603int
2604Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2605{
7918f24d 2606 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2607 PERL_UNUSED_CONTEXT;
8772537c 2608 PERL_UNUSED_ARG(sv);
7e8c5dac 2609 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2610 mg->mg_ptr = NULL;
7e8c5dac
HS
2611 mg->mg_len = -1; /* The mg_len holds the len cache. */
2612 return 0;
2613}
2614
bbce6d69 2615int
9cce4f9a
FC
2616Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2617{
9782ce69 2618 const char *bad = NULL;
9cce4f9a 2619 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2620 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2621 switch (mg->mg_private & OPpLVREF_TYPE) {
2622 case OPpLVREF_SV:
2623 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2624 bad = " SCALAR";
2625 break;
2626 case OPpLVREF_AV:
2627 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2628 bad = "n ARRAY";
2629 break;
2630 case OPpLVREF_HV:
2631 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2632 bad = " HASH";
2633 break;
2634 case OPpLVREF_CV:
2635 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2636 bad = " CODE";
2637 }
2638 if (bad)
26a50d99 2639 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2640 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2641 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2642 case 0:
2643 {
2644 SV * const old = PAD_SV(mg->mg_len);
2645 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2646 SvREFCNT_dec(old);
2647 break;
2648 }
2649 case SVt_PVGV:
2650 gv_setref(mg->mg_obj, sv);
2651 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2652 break;
2653 case SVt_PVAV:
2654 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2655 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2656 break;
2657 case SVt_PVHV:
7fcb36d5
JH
2658 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2659 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2660 }
d39c26a6
FC
2661 if (mg->mg_flags & MGf_PERSIST)
2662 NOOP; /* This sv is in use as an iterator var and will be reused,
2663 so we must leave the magic. */
2664 else
2665 /* This sv could be returned by the assignment op, so clear the
2666 magic, as lvrefs are an implementation detail that must not be
2667 leaked to the user. */
2668 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2669 return 0;
2670}
2671
f1540bed
JH
2672static void
2673S_set_dollarzero(pTHX_ SV *sv)
2674 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2675{
2676#ifdef USE_ITHREADS
2677 dVAR;
2678#endif
2679 const char *s;
2680 STRLEN len;
f1540bed
JH
2681#ifdef HAS_SETPROCTITLE
2682 /* The BSDs don't show the argv[] in ps(1) output, they
2683 * show a string from the process struct and provide
2684 * the setproctitle() routine to manipulate that. */
2685 if (PL_origalen != 1) {
2686 s = SvPV_const(sv, len);
38626956 2687# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2688 /* The leading "-" removes the "perl: " prefix,
2689 * but not the "(perl) suffix from the ps(1)
2690 * output, because that's what ps(1) shows if the
2691 * argv[] is modified. */
2692 setproctitle("-%s", s);
2693# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2694 /* This doesn't really work if you assume that
2695 * $0 = 'foobar'; will wipe out 'perl' from the $0
2696 * because in ps(1) output the result will be like
2697 * sprintf("perl: %s (perl)", s)
2698 * I guess this is a security feature:
2699 * one (a user process) cannot get rid of the original name.
2700 * --jhi */
2701 setproctitle("%s", s);
2702# endif
2703 }
2704#elif defined(__hpux) && defined(PSTAT_SETCMD)
2705 if (PL_origalen != 1) {
2706 union pstun un;
2707 s = SvPV_const(sv, len);
2708 un.pst_command = (char *)s;
2709 pstat(PSTAT_SETCMD, un, len, 0, 0);
2710 }
2711#else
2712 if (PL_origalen > 1) {
4f3e04fd 2713 I32 i;
f1540bed
JH
2714 /* PL_origalen is set in perl_parse(). */
2715 s = SvPV_force(sv,len);
2716 if (len >= (STRLEN)PL_origalen-1) {
2717 /* Longer than original, will be truncated. We assume that
2718 * PL_origalen bytes are available. */
2719 Copy(s, PL_origargv[0], PL_origalen-1, char);
2720 }
2721 else {
2722 /* Shorter than original, will be padded. */
2723#ifdef PERL_DARWIN
2724 /* Special case for Mac OS X: see [perl #38868] */
2725 const int pad = 0;
2726#else
2727 /* Is the space counterintuitive? Yes.
2728 * (You were expecting \0?)
2729 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2730 * --jhi */
2731 const int pad = ' ';
2732#endif
2733 Copy(s, PL_origargv[0], len, char);
2734 PL_origargv[0][len] = 0;
2735 memset(PL_origargv[0] + len + 1,
2736 pad, PL_origalen - len - 1);
2737 }
2738 PL_origargv[0][PL_origalen-1] = 0;
2739 for (i = 1; i < PL_origargc; i++)
2740 PL_origargv[i] = 0;
2741#ifdef HAS_PRCTL_SET_NAME
2742 /* Set the legacy process name in addition to the POSIX name on Linux */
2743 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2744 /* diag_listed_as: SKIPME */
2745 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2746 }
2747#endif
2748 }
2749#endif
2750}
2751
9cce4f9a 2752int
864dbfa3 2753Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2754{
20b7effb 2755#ifdef USE_ITHREADS
97aff369 2756 dVAR;
20b7effb 2757#endif
eb578fdb
KW
2758 I32 paren;
2759 const REGEXP * rx;
79072805 2760 I32 i;
8990e307 2761 STRLEN len;
125b9982 2762 MAGIC *tmg;
2fdbfb4d 2763
7918f24d
NC
2764 PERL_ARGS_ASSERT_MAGIC_SET;
2765
e91d8259 2766 if (!mg->mg_ptr) {
960b831f 2767 paren = mg->mg_len;
1e05feb3 2768 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2769 setparen_got_rx:
2fdbfb4d 2770 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2771 } else {
2fdbfb4d
AB
2772 /* Croak with a READONLY error when a numbered match var is
2773 * set without a previous pattern match. Unless it's C<local $1>
2774 */
e91d8259 2775 croakparen:
2fdbfb4d 2776 if (!PL_localizing) {
cb077ed2 2777 Perl_croak_no_modify();
2fdbfb4d
AB
2778 }
2779 }
e91d8259
NC
2780 return 0;
2781 }
2782
2783 switch (*mg->mg_ptr) {
748a9306 2784 case '\001': /* ^A */
f2da823f
FC
2785 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2786 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2787 FmLINES(PL_bodytarget) = 0;
2788 if (SvPOK(PL_bodytarget)) {
2789 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2790 char *e = SvEND(PL_bodytarget);
2791 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2792 FmLINES(PL_bodytarget)++;
2793 s++;
2794 }
2795 }
125b9982 2796 /* mg_set() has temporarily made sv non-magical */
284167a5 2797 if (TAINTING_get) {
125b9982
NT
2798 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2799 SvTAINTED_on(PL_bodytarget);
2800 else
2801 SvTAINTED_off(PL_bodytarget);
2802 }
748a9306 2803 break;
49460fe6 2804 case '\003': /* ^C */
f2338a2e 2805 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2806 break;
2807
79072805 2808 case '\004': /* ^D */
b4ab917c 2809#ifdef DEBUGGING
a9e2d2bf
DM
2810 {
2811 const char *s = SvPV_nolen_const(sv);
2812 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2813 if (DEBUG_x_TEST || DEBUG_B_TEST)
2814 dump_all_perl(!DEBUG_B_TEST);
2815 }
b4ab917c 2816#else
38ab35f8 2817 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2818#endif
79072805 2819 break;
28f23441 2820 case '\005': /* ^E */
d0063567 2821 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2822#ifdef VMS
38ab35f8 2823 set_vaxc_errno(SvIV(sv));
2abc681d 2824#elif defined(WIN32)
d0063567 2825 SetLastError( SvIV(sv) );
2abc681d 2826#elif defined(OS2)
38ab35f8 2827 os2_setsyserrno(SvIV(sv));
2abc681d 2828#else
d0063567 2829 /* will anyone ever use this? */
38ab35f8 2830 SETERRNO(SvIV(sv), 4);
22fae026 2831#endif
d0063567 2832 }
fd503f5c
DIM
2833 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2834 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2835 break;
79072805 2836 case '\006': /* ^F */
38ab35f8 2837 PL_maxsysfd = SvIV(sv);
79072805 2838 break;
a0d0e21e 2839 case '\010': /* ^H */
efa571ab
KW
2840 {
2841 U32 save_hints = PL_hints;
5d382c25 2842 PL_hints = SvUV(sv);
efa571ab
KW
2843
2844 /* If wasn't UTF-8, and now is, notify the parser */
2845 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2846 notify_parser_that_changed_to_utf8();
2847 }
2848 }
a0d0e21e 2849 break;
9d116dd7 2850 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2851 Safefree(PL_inplace);
bd61b366 2852 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2853 break;
d9bad346
FC
2854 case '\016': /* ^N */
2855 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2856 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2857 goto croakparen;
28f23441 2858 case '\017': /* ^O */
ac27b0f5 2859 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2860 Safefree(PL_osname);
bd61b366 2861 PL_osname = NULL;
3511154c
DM
2862 if (SvOK(sv)) {
2863 TAINT_PROPER("assigning to $^O");
2e0de35c 2864 PL_osname = savesvpv(sv);
3511154c 2865 }
ac27b0f5
NIS
2866 }
2867 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2868 STRLEN len;
2869 const char *const start = SvPV(sv, len);
b54fc2b6 2870 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2871 SV *tmp;
8b850bd5
NC
2872
2873
2874 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2875 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2876
2877 /* Opening for input is more common than opening for output, so
2878 ensure that hints for input are sooner on linked list. */
59cd0e26 2879 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2880 SvUTF8(sv))
2881 : newSVpvs_flags("", SvUTF8(sv));
2882 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2883 mg_set(tmp);
8b850bd5 2884
f747ebd6
Z
2885 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2886 SvUTF8(sv));
2887 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2888 mg_set(tmp);
ac27b0f5 2889 }
28f23441 2890 break;
79072805 2891 case '\020': /* ^P */
2fdbfb4d
AB
2892 PL_perldb = SvIV(sv);
2893 if (PL_perldb && !PL_DBsingle)
2894 init_debugger();
9b9e0be4 2895 break;
79072805 2896 case '\024': /* ^T */
88e89b8a 2897#ifdef BIG_TIME
6b88bc9c 2898 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2899#else
38ab35f8 2900 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2901#endif
79072805 2902 break;
e07ea26a
NC
2903 case '\025': /* ^UTF8CACHE */
2904 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2905 PL_utf8cache = (signed char) sv_2iv(sv);
2906 }
2907 break;
fde18df1 2908 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2909 if (*(mg->mg_ptr+1) == '\0') {
2910 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2911 i = SvIV(sv);
ac27b0f5 2912 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2913 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2914 }
599cee73 2915 }
0a378802 2916 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2917 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450 2918 if (!SvPOK(sv)) {
1113f30d
DM
2919 if (!specialWARN(PL_compiling.cop_warnings))
2920 PerlMemShared_free(PL_compiling.cop_warnings);
7e4f0450 2921 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2922 break;
2923 }
f4fc7782 2924 {
b5477537 2925 STRLEN len, i;
006c1a1d
Z
2926 int not_none = 0, not_all = 0;
2927 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2928 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2929 not_none |= ptr[i];
2930 not_all |= ptr[i] ^ 0x55;
f4fc7782 2931 }
006c1a1d 2932 if (!not_none) {
4243c432
NC
2933 if (!specialWARN(PL_compiling.cop_warnings))
2934 PerlMemShared_free(PL_compiling.cop_warnings);
2935 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2936 } else if (len >= WARNsize && !not_all) {
2937 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2938 PerlMemShared_free(PL_compiling.cop_warnings);
2939 PL_compiling.cop_warnings = pWARN_ALL;
2940 PL_dowarn |= G_WARN_ONCE ;
2941 }
d3a7d8c7 2942 else {
72dc9ed5
NC
2943 STRLEN len;
2944 const char *const p = SvPV_const(sv, len);
2945
2946 PL_compiling.cop_warnings
8ee4cf24 2947 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2948 p, len);
2949
d3a7d8c7
GS
2950 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2951 PL_dowarn |= G_WARN_ONCE ;
2952 }
f4fc7782 2953
d3a7d8c7 2954 }
4438c4b7 2955 }
971a9dd3 2956 }
8ca2a5d6
DD
2957#ifdef WIN32
2958 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2959 w32_sloppystat = (bool)sv_true(sv);
2960 }
2961#endif
79072805
LW
2962 break;
2963 case '.':
3280af22
NIS
2964 if (PL_localizing) {
2965 if (PL_localizing == 1)
7766f137 2966 SAVESPTR(PL_last_in_gv);
748a9306 2967 }
3280af22 2968 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2969 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2970 break;
2971 case '^':
acbe1b9d 2972 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2973 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2974 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2975 break;
2976 case '~':
acbe1b9d 2977 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2978 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2979 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2980 break;
2981 case '=':
acbe1b9d 2982 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2983 break;
2984 case '-':
acbe1b9d
FC
2985 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2986 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2987 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2988 break;
2989 case '%':
acbe1b9d 2990 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2991 break;
2992 case '|':
4b65379b 2993 {
099be4f1 2994 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2995 if(!io)
2996 break;
38ab35f8 2997 if ((SvIV(sv)) == 0)
4b65379b
CS
2998 IoFLAGS(io) &= ~IOf_FLUSH;
2999 else {
3000 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3001 PerlIO *ofp = IoOFP(io);
3002 if (ofp)
3003 (void)PerlIO_flush(ofp);
3004 IoFLAGS(io) |= IOf_FLUSH;
3005 }
3006 }
79072805
LW
3007 }
3008 break;
79072805 3009 case '/':
1ab48e3a 3010 {
1ab48e3a 3011 if (SvROK(sv)) {
8d37cdf7
DIM
3012 SV *referent = SvRV(sv);
3013 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3014 /* XXX: dodgy type check: This leaves me feeling dirty, but
3015 * the alternative is to copy pretty much the entire
3016 * sv_reftype() into this routine, or to do a full string
3017 * comparison on the return of sv_reftype() both of which
3018 * make me feel worse! NOTE, do not modify this comment
3019 * without reviewing the corresponding comment in
3020 * sv_reftype(). - Yves */
1ab48e3a 3021 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3022 IV val = SvIV(referent);
1ab48e3a 3023 if (val <= 0) {
520b6fb6
DIM
3024 sv_setsv(sv, PL_rs);
3025 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3026 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3027 }
3028 } else {
ddce084a 3029 sv_setsv(sv, PL_rs);
8d37cdf7 3030 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3031 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3032 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3033 }
3034 }
b3a2acfa 3035 SvREFCNT_dec(PL_rs);
520b6fb6 3036 PL_rs = newSVsv(sv);
b3a2acfa 3037 }
79072805
LW
3038 break;
3039 case '\\':
ef8d46e8 3040 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3041 if (SvOK(sv)) {
7889fe52 3042 PL_ors_sv = newSVsv(sv);
009c130f 3043 }
e3c19b7b 3044 else {
a0714e2c 3045 PL_ors_sv = NULL;
e3c19b7b 3046 }
79072805 3047 break;
7d69d4a6
FC
3048 case '[':
3049 if (SvIV(sv) != 0)
3050 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3051 break;
79072805 3052 case '?':
ff0cee69 3053#ifdef COMPLEX_STATUS
6b88bc9c 3054 if (PL_localizing == 2) {
41cb7b2b 3055 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3056 PL_statusvalue = LvTARGOFF(sv);
3057 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3058 }
3059 else
3060#endif
3061#ifdef VMSISH_STATUS
3062 if (VMSISH_STATUS)
fb38d079 3063 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3064 else
3065#endif
38ab35f8 3066 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3067 break;
3068 case '!':
93189314
JH
3069 {
3070#ifdef VMS
3071# define PERL_VMS_BANG vaxc$errno
3072#else
3073# define PERL_VMS_BANG 0
3074#endif
27329181 3075#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
3076 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3077 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3078#else
91487cfc 3079 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3080 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3081#endif
93189314 3082 }
79072805
LW
3083 break;
3084 case '<':
985213f2 3085 {
b469f1e0 3086 /* XXX $< currently silently ignores failures */
dfff4baf 3087 const Uid_t new_uid = SvUID(sv);
985213f2 3088 PL_delaymagic_uid = new_uid;
3280af22
NIS
3089 if (PL_delaymagic) {
3090 PL_delaymagic |= DM_RUID;
79072805
LW
3091 break; /* don't do magic till later */
3092 }
3093#ifdef HAS_SETRUID
b469f1e0 3094 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3095#elif defined(HAS_SETREUID)
b469f1e0 3096 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3097#elif defined(HAS_SETRESUID)
b469f1e0 3098 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3099#else
985213f2 3100 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3101# ifdef PERL_DARWIN
75870ed3 3102 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3103 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3104 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3105# endif
b469f1e0 3106 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3107 } else {
cea2e8a9 3108 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3109 }
79072805 3110#endif
79072805 3111 break;
985213f2 3112 }
79072805 3113 case '>':
985213f2 3114 {
b469f1e0 3115 /* XXX $> currently silently ignores failures */
dfff4baf 3116 const Uid_t new_euid = SvUID(sv);
985213f2 3117 PL_delaymagic_euid = new_euid;
3280af22
NIS
3118 if (PL_delaymagic) {
3119 PL_delaymagic |= DM_EUID;
79072805
LW
3120 break; /* don't do magic till later */
3121 }
3122#ifdef HAS_SETEUID
b469f1e0 3123 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3124#elif defined(HAS_SETREUID)
b469f1e0 3125 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3126#elif defined(HAS_SETRESUID)
b469f1e0 3127 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3128#else
985213f2 3129 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3130 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3131 else {
cea2e8a9 3132 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3133 }
79072805 3134#endif
79072805 3135 break;
985213f2 3136 }
79072805 3137 case '(':
985213f2 3138 {
b469f1e0 3139 /* XXX $( currently silently ignores failures */
dfff4baf 3140 const Gid_t new_gid = SvGID(sv);
985213f2 3141 PL_delaymagic_gid = new_gid;
3280af22
NIS
3142 if (PL_delaymagic) {
3143 PL_delaymagic |= DM_RGID;
79072805
LW
3144 break; /* don't do magic till later */
3145 }
3146#ifdef HAS_SETRGID
b469f1e0 3147 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3148#elif defined(HAS_SETREGID)
b469f1e0 3149 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3150#elif defined(HAS_SETRESGID)
b469f1e0 3151 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3152#else
985213f2 3153 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3154 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3155 else {
cea2e8a9 3156 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3157 }
79072805 3158#endif
79072805 3159 break;
985213f2 3160 }
79072805 3161 case ')':
985213f2 3162 {
0635704a
HS
3163/* (hv) best guess: maybe we'll need configure probes to do a better job,
3164 * but you can override it if you need to.
3165 */
3166#ifndef INVALID_GID
3167#define INVALID_GID ((Gid_t)-1)
3168#endif
b469f1e0 3169 /* XXX $) currently silently ignores failures */
dfff4baf 3170 Gid_t new_egid;
5cd24f17
PP
3171#ifdef HAS_SETGROUPS
3172 {
b83604b4 3173 const char *p = SvPV_const(sv, len);
757f63d8 3174 Groups_t *gary = NULL;
5d4a52b5 3175 const char* endptr = p + len;
22ff3130 3176 UV uv;
fb4089e0 3177#ifdef _SC_NGROUPS_MAX
3178 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3179
3180 if (maxgrp < 0)
3181 maxgrp = NGROUPS;
3182#else
3183 int maxgrp = NGROUPS;
3184#endif
757f63d8
SP
3185
3186 while (isSPACE(*p))
3187 ++p;
22ff3130
HS
3188 if (grok_atoUV(p, &uv, &endptr))
3189 new_egid = (Gid_t)uv;
3190 else {
0635704a 3191 new_egid = INVALID_GID;
22ff3130
HS
3192 endptr = NULL;
3193 }
fb4089e0 3194 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3195 if (endptr == NULL)
3196 break;
3197 p = endptr;
757f63d8
SP
3198 while (isSPACE(*p))
3199 ++p;
3200 if (!*p)
3201 break;
fdadaf77 3202 if (!gary)
757f63d8
SP
3203 Newx(gary, i + 1, Groups_t);
3204 else
3205 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3206 if (grok_atoUV(p, &uv, &endptr))
3207 gary[i] = (Groups_t)uv;
3208 else {
0635704a 3209 gary[i] = INVALID_GID;
22ff3130
HS
3210 endptr = NULL;
3211 }
757f63d8
SP
3212 }
3213 if (i)
b469f1e0 3214 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3215 Safefree(gary);
5cd24f17
PP
3216 }
3217#else /* HAS_SETGROUPS */
dfff4baf 3218 new_egid = SvGID(sv);
5cd24f17 3219#endif /* HAS_SETGROUPS */
985213f2 3220 PL_delaymagic_egid = new_egid;
3280af22
NIS
3221 if (PL_delaymagic) {
3222 PL_delaymagic |= DM_EGID;
79072805
LW
3223 break; /* don't do magic till later */
3224 }
3225#ifdef HAS_SETEGID
b469f1e0 3226 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3227#elif defined(HAS_SETREGID)
b469f1e0 3228 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3229#elif defined(HAS_SETRESGID)
b469f1e0 3230 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3231#else
985213f2 3232 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3233 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3234 else {
cea2e8a9 3235 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3236 }
79072805 3237#endif
79072805 3238 break;
985213f2 3239 }
79072805 3240 case ':':
2d8e6c8d 3241 PL_chopset = SvPV_force(sv,len);
79072805 3242 break;
9cdac2a2
FC
3243 case '$': /* $$ */
3244 /* Store the pid in mg->mg_obj so we can tell when a fork has
3245 occurred. mg->mg_obj points to *$ by default, so clear it. */
3246 if (isGV(mg->mg_obj)) {
3247 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3248 SvREFCNT_dec(mg->mg_obj);
3249 mg->mg_flags |= MGf_REFCOUNTED;
3250 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3251 }
3252 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3253 break;
79072805 3254 case '0':
e2975953 3255 LOCK_DOLLARZERO_MUTEX;
f1540bed 3256 S_set_dollarzero(aTHX_ sv);
e2975953 3257 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3258 break;
3259 }
3260 return 0;
3261}
3262
3263I32
84c7b88c
BF
3264Perl_whichsig_sv(pTHX_ SV *sigsv)
3265{
3266 const char *sigpv;
3267 STRLEN siglen;
3268 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3269 sigpv = SvPV_const(sigsv, siglen);
3270 return whichsig_pvn(sigpv, siglen);
3271}
3272
3273I32
3274Perl_whichsig_pv(pTHX_ const char *sig)
3275{
3276 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3277 return whichsig_pvn(sig, strlen(sig));
3278}
3279
3280I32
3281Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3282{
eb578fdb 3283 char* const* sigv;
7918f24d 3284
84c7b88c 3285 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3286 PERL_UNUSED_CONTEXT;
79072805 3287
aadb217d 3288 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3289 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3290 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3291#ifdef SIGCLD
84c7b88c 3292 if (memEQs(sig, len, "CHLD"))
79072805
LW
3293 return SIGCLD;
3294#endif
3295#ifdef SIGCHLD
84c7b88c 3296 if (memEQs(sig, len, "CLD"))
79072805
LW
3297 return SIGCHLD;
3298#endif
7f1236c0 3299 return -1;
79072805
LW
3300}
3301
ecfc5424 3302Signal_t
1e82f5a6 3303#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3304Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3305#else
3306Perl_sighandler(int sig)
3307#endif
79072805 3308{
1018e26f
NIS
3309#ifdef PERL_GET_SIG_CONTEXT
3310 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3311#else
cea2e8a9 3312 dTHX;
71d280e3 3313#endif
79072805 3314 dSP;
a0714e2c
SS
3315 GV *gv = NULL;
3316 SV *sv = NULL;
8772537c 3317 SV * const tSv = PL_Sv;
601f1833 3318 CV *cv = NULL;
533c011a 3319 OP *myop = PL_op;
84902520 3320 U32 flags = 0;
8772537c 3321 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3322 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3323 SV *errsv_save = NULL;
71d280e3 3324
84902520 3325
727405f8 3326 if (!PL_psig_ptr[sig]) {
99ef548b 3327 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3328 PL_sig_name[sig]);
3329 exit(sig);
3330 }
ff0cee69 3331
a0d63a7b
DM
3332 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3333 /* Max number of items pushed there is 3*n or 4. We cannot fix
3334 infinity, so we fix 4 (in fact 5): */
3335 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3336 flags |= 1;
3337 PL_savestack_ix += 5; /* Protect save in progress. */
3338 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3339 }
84902520 3340 }
84902520 3341 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3342 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3343 || SvTYPE(cv) != SVt_PVCV) {
3344 HV *st;
f2c0649b 3345 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3346 }
84902520 3347
a0d0e21e 3348 if (!cv || !CvROOT(cv)) {
07c325bb 3349 const HEK * const hek = gv
1d6bb9ae
FC
3350 ? GvENAME_HEK(gv)
3351 : cv && CvNAMED(cv)
3352 ? CvNAME_HEK(cv)
07c325bb
FC
3353 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3354 if (hek)
3355 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3356 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3357 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3358 /* diag_listed_as: SIG%s handler "%s" not defined */
3359 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3360 "SIG%s handler \"__ANON__\" not defined.\n",
3361 PL_sig_name[sig]);
00d579c5 3362 goto cleanup;
79072805
LW
3363 }
3364
0c4d3b5e
DM
3365 sv = PL_psig_name[sig]
3366 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3367 : newSVpv(PL_sig_name[sig],0);
72048cfe 3368 flags |= 8;
0c4d3b5e
DM
3369 SAVEFREESV(sv);
3370
a0d63a7b
DM
3371 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3372 /* make sure our assumption about the size of the SAVEs are correct:
3373 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3374 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3375 }
e336de0d 3376
e788e7d3 3377 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3378 PUSHMARK(SP);
79072805 3379 PUSHs(sv);
8aad04aa
JH
3380#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3381 {
3382 struct sigaction oact;
3383
3384 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3385 if (sip) {
3386 HV *sih = newHV();
ad64d0ec 3387 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3388 /* The siginfo fields signo, code, errno, pid, uid,
3389 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3390 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3391 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3392#ifdef HAS_SIGINFO_SI_ERRNO
3393 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3394#endif
3395#ifdef HAS_SIGINFO_SI_STATUS
3396 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3397#endif
3398#ifdef HAS_SIGINFO_SI_UID
3399 {
3400 SV *uid = newSV(0);
3401 sv_setuid(uid, sip->si_uid);
3402 (void)hv_stores(sih, "uid", uid);
3403 }
3404#endif
3405#ifdef HAS_SIGINFO_SI_PID
3406 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3407#endif
3408#ifdef HAS_SIGINFO_SI_ADDR
3409 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3410#endif
3411#ifdef HAS_SIGINFO_SI_BAND
3412 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3413#endif
8aad04aa 3414 EXTEND(SP, 2);
ad64d0ec 3415 PUSHs(rv);
22f1178f 3416 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3417 }
b4552a27 3418
8aad04aa
JH
3419 }
3420 }
3421#endif
79072805 3422 PUTBACK;
a0d0e21e 3423
100c03aa
JL
3424 errsv_save = newSVsv(ERRSV);
3425
ad64d0ec 3426 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3427
d3acc0f7 3428 POPSTACK;
eed484f9
DD
3429 {
3430 SV * const errsv = ERRSV;
3431 if (SvTRUE_NN(errsv)) {
3432 SvREFCNT_dec(errsv_save);
c22d665b 3433#ifndef PERL_MICRO
1b266415
NIS
3434 /* Handler "died", for example to get out of a restart-able read().
3435 * Before we re-do that on its behalf re-enable the signal which was
3436 * blocked by the system when we entered.
3437 */
c22d665b 3438#ifdef HAS_SIGPROCMASK
d488af49 3439#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3440 if (sip || uap)
c22d665b 3441#endif
eed484f9
DD
3442 {
3443 sigset_t set;
3444 sigemptyset(&set);
3445 sigaddset(&set,sig);
3446 sigprocmask(SIG_UNBLOCK, &set, NULL);
3447 }
c22d665b 3448#else
eed484f9
DD
3449 /* Not clear if this will work */
3450 (void)rsignal(sig, SIG_IGN);
3451 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3452#endif
3453#endif /* !PERL_MICRO */
eed484f9
DD
3454 die_sv(errsv);
3455 }
3456 else {
3457 sv_setsv(errsv, errsv_save);
3458 SvREFCNT_dec(errsv_save);
3459 }
100c03aa
JL
3460 }
3461
7b52d656 3462 cleanup:
0c4d3b5e
DM
3463 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3464 PL_savestack_ix = old_ss_ix;
72048cfe 3465 if (flags & 8)
2357bae7 3466 SvREFCNT_dec_NN(sv);
533c011a 3467 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3468