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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);
44955e7d
DM
559
560 if (mg->mg_type == PERL_MAGIC_collxfrm && mg->mg_len >= 0)
561 /* collate magic uses string len not buffer len, so
562 * free even with mg_len == 0 */
563 Safefree(mg->mg_ptr);
564 else if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
d9088386
Z
565 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
566 Safefree(mg->mg_ptr);
567 else if (mg->mg_len == HEf_SVKEY)
568 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
569 }
44955e7d 570
d9088386
Z
571 if (mg->mg_flags & MGf_REFCOUNTED)
572 SvREFCNT_dec(mg->mg_obj);
573 Safefree(mg);
574}
575
0cbee0a4 576/*
954c1994
GS
577=for apidoc mg_free
578
fbe13c60 579Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
580
581=cut
582*/
583
79072805 584int
864dbfa3 585Perl_mg_free(pTHX_ SV *sv)
79072805
LW
586{
587 MAGIC* mg;
588 MAGIC* moremagic;
7918f24d
NC
589
590 PERL_ARGS_ASSERT_MG_FREE;
591
79072805 592 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 593 moremagic = mg->mg_moremagic;
d9088386 594 mg_free_struct(sv, mg);
c826f41b 595 SvMAGIC_set(sv, moremagic);
79072805 596 }
b162af07 597 SvMAGIC_set(sv, NULL);
68f8932e 598 SvMAGICAL_off(sv);
79072805
LW
599 return 0;
600}
601
d9088386 602/*
44170c9a 603=for apidoc mg_free_type
d9088386 604
2d7f6611 605Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z
606
607=cut
608*/
609
610void
611Perl_mg_free_type(pTHX_ SV *sv, int how)
612{
613 MAGIC *mg, *prevmg, *moremg;
614 PERL_ARGS_ASSERT_MG_FREE_TYPE;
615 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
d9088386
Z
616 moremg = mg->mg_moremagic;
617 if (mg->mg_type == how) {
19742f39 618 MAGIC *newhead;
d9088386
Z
619 /* temporarily move to the head of the magic chain, in case
620 custom free code relies on this historical aspect of mg_free */
621 if (prevmg) {
622 prevmg->mg_moremagic = moremg;
623 mg->mg_moremagic = SvMAGIC(sv);
624 SvMAGIC_set(sv, mg);
625 }
626 newhead = mg->mg_moremagic;
627 mg_free_struct(sv, mg);
628 SvMAGIC_set(sv, newhead);
629 mg = prevmg;
630 }
631 }
632 mg_magical(sv);
633}
634
e0d4aead
TC
635/*
636=for apidoc mg_freeext
637
638Remove any magic of type C<how> using virtual table C<vtbl> from the
639SV C<sv>. See L</sv_magic>.
640
641C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
642
643=cut
644*/
645
646void
647Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
648{
649 MAGIC *mg, *prevmg, *moremg;
650 PERL_ARGS_ASSERT_MG_FREEEXT;
651 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
652 MAGIC *newhead;
653 moremg = mg->mg_moremagic;
654 if (mg->mg_type == how && (vtbl == NULL || mg->mg_virtual == vtbl)) {
655 /* temporarily move to the head of the magic chain, in case
656 custom free code relies on this historical aspect of mg_free */
657 if (prevmg) {
658 prevmg->mg_moremagic = moremg;
659 mg->mg_moremagic = SvMAGIC(sv);
660 SvMAGIC_set(sv, mg);
661 }
662 newhead = mg->mg_moremagic;
663 mg_free_struct(sv, mg);
664 SvMAGIC_set(sv, newhead);
665 mg = prevmg;
666 }
667 }
668 mg_magical(sv);
669}
670
79072805 671#include <signal.h>
79072805 672
942e002e 673U32
864dbfa3 674Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 675{
8772537c 676 PERL_UNUSED_ARG(sv);
6cef1e77 677
7918f24d
NC
678 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
679
0bd48802 680 if (PL_curpm) {
27deb0cf 681 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 682 if (rx) {
fa531f32
DM
683 const SSize_t n = (SSize_t)mg->mg_obj;
684 if (n == '+') { /* @+ */
a678b0e4 685 /* return the number possible */
07bc277f 686 return RX_NPARENS(rx);
27deb0cf 687 } else { /* @- @^CAPTURE @{^CAPTURE} */
07bc277f 688 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
689
690 /* return the last filled */
f46c4081 691 while ( paren >= 0
07bc277f
NC
692 && (RX_OFFS(rx)[paren].start == -1
693 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 694 paren--;
fa531f32 695 if (n == '-') {
27deb0cf
YO
696 /* @- */
697 return (U32)paren;
698 } else {
699 /* @^CAPTURE @{^CAPTURE} */
700 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
701 }
702 }
0bd48802 703 }
8f580fb8 704 }
ac27b0f5 705
942e002e 706 return (U32)-1;
6cef1e77
IZ
707}
708
6502e081
DM
709/* @-, @+ */
710
6cef1e77 711int
864dbfa3 712Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 713{
7918f24d
NC
714 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
715
0bd48802 716 if (PL_curpm) {
27deb0cf 717 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 718 if (rx) {
fa531f32 719 const SSize_t n = (SSize_t)mg->mg_obj;
27deb0cf
YO
720 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
721 const I32 paren = mg->mg_len
fa531f32 722 + (n == '\003' ? 1 : 0);
a10eae29
FC
723 SSize_t s;
724 SSize_t t;
0bd48802
AL
725 if (paren < 0)
726 return 0;
07bc277f
NC
727 if (paren <= (I32)RX_NPARENS(rx) &&
728 (s = RX_OFFS(rx)[paren].start) != -1 &&
729 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 730 {
a10eae29 731 SSize_t i;
27deb0cf 732
fa531f32 733 if (n == '+') /* @+ */
0bd48802 734 i = t;
fa531f32 735 else if (n == '-') /* @- */
0bd48802 736 i = s;
27deb0cf
YO
737 else { /* @^CAPTURE @{^CAPTURE} */
738 CALLREG_NUMBUF_FETCH(rx,paren,sv);
739 return 0;
740 }
0bd48802 741
a10eae29 742 if (RX_MATCH_UTF8(rx)) {
07bc277f 743 const char * const b = RX_SUBBEG(rx);
0bd48802 744 if (b)
6502e081
DM
745 i = RX_SUBCOFFSET(rx) +
746 utf8_length((U8*)b,
747 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 748 }
727405f8 749
a10eae29 750 sv_setuv(sv, i);
232af1f8 751 return 0;
1aa99e6b 752 }
0bd48802 753 }
6cef1e77 754 }
3773545d 755 sv_set_undef(sv);
6cef1e77
IZ
756 return 0;
757}
758
6502e081
DM
759/* @-, @+ */
760
e4b89193 761int
a29d06ed
MG
762Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
763{
7918f24d 764 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 765 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
766 PERL_UNUSED_ARG(sv);
767 PERL_UNUSED_ARG(mg);
cb077ed2 768 Perl_croak_no_modify();
0dbb1585 769 NORETURN_FUNCTION_END;
a29d06ed
MG
770}
771
ad3296c6 772#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
773 if (SvPOK(sv)) { \
774 STRLEN len = SvCUR(sv); \
775 char * const p = SvPVX(sv); \
8e6b4db6
PC
776 while (len > 0 && isSPACE(p[len-1])) \
777 --len; \
778 SvCUR_set(sv, len); \
779 p[len] = '\0'; \
780 } \
ad3296c6
SH
781} STMT_END
782
8b850bd5
NC
783void
784Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
785{
7918f24d
NC
786 PERL_ARGS_ASSERT_EMULATE_COP_IO;
787
8b850bd5 788 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
e03e82a0 789 sv_set_undef(sv);
8b850bd5 790 else {
b2aed775 791 SvPVCLEAR(sv);
8b850bd5
NC
792 SvUTF8_off(sv);
793 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 794 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
795 assert(value);
796 sv_catsv(sv, value);
797 }
798 sv_catpvs(sv, "\0");
799 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 800 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
801 assert(value);
802 sv_catsv(sv, value);
803 }
804 }
805}
806
d9fe7d23
KW
807STATIC void
808S_fixup_errno_string(pTHX_ SV* sv)
809{
810 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
811 * Perl space. */
812
813 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
814
815 assert(SvOK(sv));
b35e4f8b
KW
816
817 if(strEQ(SvPVX(sv), "")) {
818 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
819 }
820 else {
d9fe7d23 821
d3c0b317
KW
822 /* In some locales the error string may come back as UTF-8, in which
823 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
824 * avoid as many possible backward compatibility issues as possible, we
825 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87 826 * an entirely invariant string. We assume that if the string looks
fab19207
KW
827 * like UTF-8 in a single script, it really is UTF-8: "text in any
828 * other encoding that uses bytes with the high bit set is extremely
829 * unlikely to pass a UTF-8 validity test"
9f10db87
KW
830 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
831 * potential that we will get it wrong however, especially on short
a8f4b0c6 832 * error message text, so do an additional check. */
027a0d26
KW
833 if ( ! IN_BYTES /* respect 'use bytes' */
834 && is_utf8_non_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
a8f4b0c6
KW
835
836#ifdef USE_LOCALE_MESSAGES
837
61520eee 838 && _is_cur_LC_category_utf8(LC_MESSAGES)
a8f4b0c6 839
fab19207
KW
840#else /* If can't check directly, at least can see if script is consistent,
841 under UTF-8, which gives us an extra measure of confidence. */
842
843 && isSCRIPT_RUN((const U8 *) SvPVX_const(sv), (U8 *) SvEND(sv),
8c53dada 844 TRUE) /* Means assume UTF-8 */
a8f4b0c6
KW
845#endif
846
847 ) {
d3c0b317
KW
848 SvUTF8_on(sv);
849 }
b35e4f8b 850 }
d9fe7d23
KW
851}
852
658db622 853/*
44170c9a 854=for apidoc sv_string_from_errnum
658db622
Z
855
856Generates the message string describing an OS error and returns it as
857an SV. C<errnum> must be a value that C<errno> could take, identifying
858the type of error.
859
860If C<tgtsv> is non-null then the string will be written into that SV
861(overwriting existing content) and it will be returned. If C<tgtsv>
862is a null pointer then the string will be written into a new mortal SV
863which will be returned.
864
865The message will be taken from whatever locale would be used by C<$!>,
866and will be encoded in the SV in whatever manner would be used by C<$!>.
867The details of this process are subject to future change. Currently,
868the message is taken from the C locale by default (usually producing an
869English message), and from the currently selected locale when in the scope
870of the C<use locale> pragma. A heuristic attempt is made to decode the
871message from the locale's character encoding, but it will only be decoded
872as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
873locale, usually in an ISO-8859-1 locale, and never in any other locale.
874
875The SV is always returned containing an actual string, and with no other
876OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
877(meaning success), and if no useful message is available then a useless
878string (currently empty) is returned.
879
880=cut
881*/
882
883SV *
884Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
885{
886 char const *errstr;
887 if(!tgtsv)
888 tgtsv = sv_newmortal();
889 errstr = my_strerror(errnum);
890 if(errstr) {
891 sv_setpv(tgtsv, errstr);
892 fixup_errno_string(tgtsv);
893 } else {
894 SvPVCLEAR(tgtsv);
895 }
896 return tgtsv;
897}
898
25bbd826
CB
899#ifdef VMS
900#include <descrip.h>
901#include <starlet.h>
902#endif
903
79072805 904int
864dbfa3 905Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 906{
eb578fdb
KW
907 I32 paren;
908 const char *s = NULL;
909 REGEXP *rx;
823a54a3 910 const char * const remaining = mg->mg_ptr + 1;
e91d8259 911 char nextchar;
79072805 912
7918f24d
NC
913 PERL_ARGS_ASSERT_MAGIC_GET;
914
e91d8259 915 if (!mg->mg_ptr) {
e91d8259 916 paren = mg->mg_len;
e91d8259 917 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 918 do_numbuf_fetch:
e91d8259 919 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 920 }
e03e82a0
DM
921 else
922 goto set_undef;
e91d8259
NC
923 return 0;
924 }
925
926 nextchar = *remaining;
79072805 927 switch (*mg->mg_ptr) {
748a9306 928 case '\001': /* ^A */
f2da823f 929 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
930 else
931 sv_set_undef(sv);
125b9982
NT
932 if (SvTAINTED(PL_bodytarget))
933 SvTAINTED_on(sv);
748a9306 934 break;
e5218da5 935 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 936 if (nextchar == '\0') {
e5218da5
GA
937 sv_setiv(sv, (IV)PL_minus_c);
938 }
823a54a3 939 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
940 sv_setiv(sv, (IV)STATUS_NATIVE);
941 }
49460fe6
NIS
942 break;
943
79072805 944 case '\004': /* ^D */
aea4f609 945 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 946 break;
28f23441 947 case '\005': /* ^E */
6c6eab55
KW
948 if (nextchar != '\0') {
949 if (strEQ(remaining, "NCODING"))
3773545d 950 sv_set_undef(sv);
4f4ff3a7 951 break;
6c6eab55 952 }
4f4ff3a7
KW
953
954#if defined(VMS) || defined(OS2) || defined(WIN32)
955# if defined(VMS)
2a99ff86
KW
956 {
957 char msg[255];
958 $DESCRIPTOR(msgdsc,msg);
959 sv_setnv(sv,(NV) vaxc$errno);
960 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
961 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
962 else
b2aed775 963 SvPVCLEAR(sv);
2a99ff86 964 }
4b645107 965#elif defined(OS2)
2a99ff86
KW
966 if (!(_emx_env & 0x200)) { /* Under DOS */
967 sv_setnv(sv, (NV)errno);
2c6ee1a7 968 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
969 } else {
970 if (errno != errno_isOS2) {
971 const int tmp = _syserrno();
972 if (tmp) /* 2nd call to _syserrno() makes it 0 */
973 Perl_rc = tmp;
974 }
975 sv_setnv(sv, (NV)Perl_rc);
976 sv_setpv(sv, os2error(Perl_rc));
977 }
1534c6f5 978 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
979 fixup_errno_string(sv);
980 }
4f4ff3a7 981# elif defined(WIN32)
2a99ff86
KW
982 {
983 const DWORD dwErr = GetLastError();
984 sv_setnv(sv, (NV)dwErr);
985 if (dwErr) {
986 PerlProc_GetOSError(sv, dwErr);
2efab60d 987 fixup_errno_string(sv);
2a99ff86
KW
988 }
989 else
b2aed775 990 SvPVCLEAR(sv);
2a99ff86
KW
991 SetLastError(dwErr);
992 }
4f4ff3a7
KW
993# else
994# error Missing code for platform
995# endif
2a99ff86
KW
996 SvRTRIM(sv);
997 SvNOK_on(sv); /* what a wonderful hack! */
998 break;
4f4ff3a7
KW
999#endif /* End of platforms with special handling for $^E; others just fall
1000 through to $! */
2165bd23 1001 /* FALLTHROUGH */
46f3e16c
KW
1002
1003 case '!':
1004 {
5f1b979d 1005 dSAVE_ERRNO;
46f3e16c 1006#ifdef VMS
5f1b979d 1007 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 1008#else
5f1b979d 1009 sv_setnv(sv, (NV)errno);
46f3e16c
KW
1010#endif
1011#ifdef OS2
5f1b979d
KW
1012 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1013 sv_setpv(sv, os2error(Perl_rc));
1014 else
46f3e16c 1015#endif
5f1b979d 1016 if (! errno) {
b2aed775 1017 SvPVCLEAR(sv);
46f3e16c 1018 }
5f1b979d 1019 else {
658db622
Z
1020 sv_string_from_errnum(errno, sv);
1021 /* If no useful string is available, don't
1022 * claim to have a string part. The SvNOK_on()
5f1b979d 1023 * below will cause just the number part to be valid */
658db622
Z
1024 if (!SvCUR(sv))
1025 SvPOK_off(sv);
5f1b979d
KW
1026 }
1027 RESTORE_ERRNO;
46f3e16c
KW
1028 }
1029
1030 SvRTRIM(sv);
1031 SvNOK_on(sv); /* what a wonderful hack! */
1032 break;
1033
79072805 1034 case '\006': /* ^F */
9f601cf3
TC
1035 if (nextchar == '\0') {
1036 sv_setiv(sv, (IV)PL_maxsysfd);
1037 }
1038 else if (strEQ(remaining, "EATURE_BITS")) {
1039 sv_setuv(sv, PL_compiling.cop_features);
1040 }
79072805 1041 break;
9ebf26ad
FR
1042 case '\007': /* ^GLOBAL_PHASE */
1043 if (strEQ(remaining, "LOBAL_PHASE")) {
1044 sv_setpvn(sv, PL_phase_names[PL_phase],
1045 strlen(PL_phase_names[PL_phase]));
1046 }
1047 break;
a0d0e21e 1048 case '\010': /* ^H */
5d382c25 1049 sv_setuv(sv, PL_hints);
a0d0e21e 1050 break;
9d116dd7 1051 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1052 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1053 break;
8561ea1d
FC
1054 case '\014': /* ^LAST_FH */
1055 if (strEQ(remaining, "AST_FH")) {
745e740c 1056 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1057 assert(isGV_with_GP(PL_last_in_gv));
1058 SV_CHECK_THINKFIRST_COW_DROP(sv);
1059 prepare_SV_for_RV(sv);
1060 SvOK_off(sv);
1061 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1062 SvROK_on(sv);
1063 sv_rvweaken(sv);
1064 }
3773545d
DM
1065 else
1066 sv_set_undef(sv);
8561ea1d
FC
1067 }
1068 break;
ac27b0f5 1069 case '\017': /* ^O & ^OPEN */
823a54a3 1070 if (nextchar == '\0') {
ac27b0f5 1071 sv_setpv(sv, PL_osname);
3511154c
DM
1072 SvTAINTED_off(sv);
1073 }
823a54a3 1074 else if (strEQ(remaining, "PEN")) {
8b850bd5 1075 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1076 }
28f23441 1077 break;
9ebf26ad 1078 case '\020':
a6d0b1b5 1079 sv_setiv(sv, (IV)PL_perldb);
79072805 1080 break;
fb73857a 1081 case '\023': /* ^S */
f512d242 1082 if (nextchar == '\0') {
bc177e6b 1083 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1084 SvOK_off(sv);
3280af22 1085 else if (PL_in_eval)
6dc8a9e4 1086 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1087 else
1088 sv_setiv(sv, 0);
d58bf5aa 1089 }
f512d242
KW
1090 else if (strEQ(remaining, "AFE_LOCALES")) {
1091
1092#if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1093
1094 sv_setuv(sv, (UV) 1);
1095
1096#else
1097 sv_setuv(sv, (UV) 0);
1098
1099#endif
1100
1101 }
fb73857a 1102 break;
79072805 1103 case '\024': /* ^T */
823a54a3 1104 if (nextchar == '\0') {
88e89b8a 1105#ifdef BIG_TIME
7c36658b 1106 sv_setnv(sv, PL_basetime);
88e89b8a 1107#else
7c36658b 1108 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1109#endif
7c36658b 1110 }
823a54a3 1111 else if (strEQ(remaining, "AINT"))
284167a5
SM
1112 sv_setiv(sv, TAINTING_get
1113 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1114 : 0);
7c36658b 1115 break;
e07ea26a 1116 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1117 if (strEQ(remaining, "NICODE"))
a05d7ebb 1118 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1119 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1120 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1121 else if (strEQ(remaining, "TF8CACHE"))
1122 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1123 break;
1124 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1125 if (nextchar == '\0')
8298454c 1126 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1127 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1128 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1129 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1130 }
1131 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1132 goto set_undef;
013b78e8 1133 }
d3a7d8c7 1134 else if (PL_compiling.cop_warnings == pWARN_ALL) {
006c1a1d 1135 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1136 }
4438c4b7 1137 else {
72dc9ed5
NC
1138 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1139 *PL_compiling.cop_warnings);
ac27b0f5 1140 }
4438c4b7 1141 }
8ca2a5d6
DD
1142#ifdef WIN32
1143 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1144 sv_setiv(sv, w32_sloppystat);
1145 }
1146#endif
79072805 1147 break;
79072805 1148 case '+':
aaa362c4 1149 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1150 paren = RX_LASTPAREN(rx);
1151 if (paren)
1152 goto do_numbuf_fetch;
79072805 1153 }
e03e82a0 1154 goto set_undef;
a01268b5
JH
1155 case '\016': /* ^N */
1156 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1157 paren = RX_LASTCLOSEPAREN(rx);
1158 if (paren)
1159 goto do_numbuf_fetch;
a01268b5 1160 }
e03e82a0 1161 goto set_undef;
79072805 1162 case '.':
3280af22 1163 if (GvIO(PL_last_in_gv)) {
357c8808 1164 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1165 }
79072805
LW
1166 break;
1167 case '?':
809a5acc 1168 {
809a5acc 1169 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1170#ifdef COMPLEX_STATUS
41cb7b2b 1171 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1172 LvTARGOFF(sv) = PL_statusvalue;
1173 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1174#endif
809a5acc 1175 }
79072805
LW
1176 break;
1177 case '^':
acbe1b9d 1178 if (GvIOp(PL_defoutgv))
099be4f1 1179 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1180 if (s)
1181 sv_setpv(sv,s);
1182 else {
3280af22 1183 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1184 sv_catpvs(sv,"_TOP");
79072805
LW
1185 }
1186 break;
1187 case '~':
acbe1b9d 1188 if (GvIOp(PL_defoutgv))
0daa599b 1189 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1190 if (!s)
3280af22 1191 s = GvENAME(PL_defoutgv);
79072805
LW
1192 sv_setpv(sv,s);
1193 break;
79072805 1194 case '=':
099be4f1 1195 if (GvIO(PL_defoutgv))
0daa599b 1196 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1197 break;
1198 case '-':
099be4f1 1199 if (GvIO(PL_defoutgv))
0daa599b 1200 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1201 break;
1202 case '%':
099be4f1 1203 if (GvIO(PL_defoutgv))
0daa599b 1204 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1205 break;
79072805 1206 case ':':
79072805
LW
1207 case '/':
1208 break;
1209 case '[':
e1dccc0d 1210 sv_setiv(sv, 0);
79072805
LW
1211 break;
1212 case '|':
099be4f1 1213 if (GvIO(PL_defoutgv))
0daa599b 1214 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1215 break;
79072805 1216 case '\\':
b2ce0fda 1217 if (PL_ors_sv)
f28098ff 1218 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1219 else
e03e82a0 1220 goto set_undef;
79072805 1221 break;
0e219455 1222 case '$': /* $$ */
9cdac2a2
FC
1223 {
1224 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1225 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1226 /* never set manually, or at least not since last fork */
1227 sv_setiv(sv, pid);
19db9fb7
Z
1228 /* never unsafe, even if reading in a tainted expression */
1229 SvTAINTED_off(sv);
1230 }
9cdac2a2
FC
1231 /* else a value has been assigned manually, so do nothing */
1232 }
0e219455 1233 break;
79072805 1234 case '<':
dfff4baf 1235 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1236 break;
1237 case '>':
dfff4baf 1238 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1239 break;
1240 case '(':
dfff4baf 1241 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1242 goto add_groups;
1243 case ')':
dfff4baf 1244 sv_setgid(sv, PerlProc_getegid());
79072805 1245 add_groups:
79072805 1246#ifdef HAS_GETGROUPS
79072805 1247 {
57d7c65e 1248 Groups_t *gary = NULL;
375ed12a
JH
1249 I32 num_groups = getgroups(0, gary);
1250 if (num_groups > 0) {
19742f39 1251 I32 i;
375ed12a
JH
1252 Newx(gary, num_groups, Groups_t);
1253 num_groups = getgroups(num_groups, gary);
1254 for (i = 0; i < num_groups; i++)
147e3846 1255 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1256 Safefree(gary);
1257 }
79072805 1258 }
155aba94 1259 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1260#endif
79072805 1261 break;
79072805
LW
1262 case '0':
1263 break;
1264 }
a0d0e21e 1265 return 0;
e03e82a0
DM
1266
1267 set_undef:
1268 sv_set_undef(sv);
1269 return 0;
79072805
LW
1270}
1271
1272int
864dbfa3 1273Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1274{
8772537c 1275 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1276
7918f24d
NC
1277 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1278
79072805 1279 if (uf && uf->uf_val)
24f81a43 1280 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1281 return 0;
1282}
1283
1284int
864dbfa3 1285Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1286{
9ae3433d 1287 STRLEN len = 0, klen;
12033064 1288 const char * const key = MgPV_const(mg,klen);
888a67f6 1289 const char *s = "";
1e422769 1290
7918f24d
NC
1291 PERL_ARGS_ASSERT_MAGIC_SETENV;
1292
613c63b4 1293 SvGETMAGIC(sv);
12033064 1294 if (SvOK(sv)) {
613c63b4
CS
1295 /* defined environment variables are byte strings; unfortunately
1296 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1297 (void)SvPV_force_nomg_nolen(sv);
1298 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1299 if (SvUTF8(sv)) {
1300 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1301 SvUTF8_off(sv);
1302 }
1303 s = SvPVX(sv);
1304 len = SvCUR(sv);
12033064
CS
1305 }
1306 my_setenv(key, s); /* does the deed */
1307
a0d0e21e
LW
1308#ifdef DYNAMIC_ENV_FETCH
1309 /* We just undefd an environment var. Is a replacement */
1310 /* waiting in the wings? */
1311 if (!len) {
6bd66ee9 1312 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1313 if (valp)
4ab59fcc 1314 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1315 }
1316#endif
1e422769 1317
28542d8f 1318#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1319 /* And you'll never guess what the dog had */
1320 /* in its mouth... */
284167a5 1321 if (TAINTING_get) {
1e422769
PP
1322 MgTAINTEDDIR_off(mg);
1323#ifdef VMS
b2aed775 1324 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1325 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1326 int i = 0, j = 0;
1327
6fca0082 1328 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1329 elt = eltbuf;
1e422769
PP
1330 do { /* DCL$PATH may be a search list */
1331 while (1) { /* as may dev portion of any element */
1332 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1333 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1334 cando_by_name(S_IWUSR,0,elt) ) {
1335 MgTAINTEDDIR_on(mg);
1336 return 0;
1337 }
1338 }
bd61b366 1339 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1340 *cp = '\0';
1341 if (my_trnlnm(elt, eltbuf, j++))
1342 elt = eltbuf;
1343 else
1344 break;
1345 }
1346 j = 0;
1347 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1348 }
1349#endif /* VMS */
b2aed775 1350 if (s && memEQs(key, klen, "PATH")) {
8772537c 1351 const char * const strend = s + len;
463ee0b2 1352
70b484a8
DM
1353 /* set MGf_TAINTEDDIR if any component of the new path is
1354 * relative or world-writeable */
463ee0b2 1355 while (s < strend) {
96827780 1356 char tmpbuf[256];
c623ac67 1357 Stat_t st;
5f74f29c 1358 I32 i;
83269ced
CB
1359#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1360 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1361#else
1362 const char path_sep = ':';
1363#endif
ba0a4150 1364 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1365 s, strend, path_sep, &i);
463ee0b2 1366 s++;
bb7a0f54 1367 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1368#ifdef __VMS
1369 /* no colon thus no device name -- assume relative path */
1370 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1371 /* Using Unix separator, e.g. under bash, so act line Unix */
1372 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1373#else
1374 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1375#endif
c6ed36e1 1376 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1377 MgTAINTEDDIR_on(mg);
1e422769
PP
1378 return 0;
1379 }
463ee0b2 1380 }
79072805
LW
1381 }
1382 }
28542d8f 1383#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1384
79072805
LW
1385 return 0;
1386}
1387
1388int
864dbfa3 1389Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1390{
7918f24d 1391 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1392 PERL_UNUSED_ARG(sv);
bd61b366 1393 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1394 return 0;
1395}
1396
88e89b8a 1397int
864dbfa3 1398Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1399{
7918f24d 1400 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1401 PERL_UNUSED_ARG(mg);
b0269e46 1402#if defined(VMS)
cea2e8a9 1403 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1404#else
3280af22 1405 if (PL_localizing) {
fb73857a 1406 HE* entry;
b0269e46 1407 my_clearenv();
85fbaab2
NC
1408 hv_iterinit(MUTABLE_HV(sv));
1409 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1410 I32 keylen;
1411 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1412 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1413 }
1414 }
1415#endif
1416 return 0;
1417}
1418
1419int
864dbfa3 1420Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1421{
7918f24d 1422 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1423 PERL_UNUSED_ARG(sv);
1424 PERL_UNUSED_ARG(mg);
b0269e46
AB
1425#if defined(VMS)
1426 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1427#else
1428 my_clearenv();
1429#endif
3e3baf6d 1430 return 0;
66b1d557
HM
1431}
1432
64ca3a65 1433#ifndef PERL_MICRO
2d4fcd5e
AJ
1434#ifdef HAS_SIGPROCMASK
1435static void
1436restore_sigmask(pTHX_ SV *save_sv)
1437{
0bd48802 1438 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1439 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1440}
1441#endif
66b1d557 1442int
864dbfa3 1443Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1444{
88e89b8a 1445 /* Are we fetching a signal entry? */
708854f2 1446 int i = (I16)mg->mg_private;
7918f24d
NC
1447
1448 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1449
708854f2 1450 if (!i) {
84c7b88c
BF
1451 STRLEN siglen;
1452 const char * sig = MgPV_const(mg, siglen);
1453 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1454 }
1455
e02bfb16 1456 if (i > 0) {
22c35a8c
GS
1457 if(PL_psig_ptr[i])
1458 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1459 else {
46da273f 1460 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1461#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1462 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1463 sigstate = SIG_IGN;
2e34cc90
CL
1464#endif
1465#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1466 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1467 sigstate = SIG_DFL;
85b332e2 1468#endif
88e89b8a 1469 /* cache state so we don't fetch it again */
8aad04aa 1470 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1471 sv_setpvs(sv,"IGNORE");
88e89b8a 1472 else
e03e82a0 1473 sv_set_undef(sv);
46da273f 1474 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1475 SvTEMP_off(sv);
1476 }
1477 }
1478 return 0;
1479}
1480int
864dbfa3 1481Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1482{
7918f24d 1483 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1484
38a124f0 1485 magic_setsig(NULL, mg);
179c85a2 1486 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1487}
3d37d572 1488
0a8e0eff 1489Signal_t
8aad04aa 1490#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1491Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1492#else
0a8e0eff 1493Perl_csighandler(int sig)
8aad04aa 1494#endif
0a8e0eff 1495{
1018e26f
NIS
1496#ifdef PERL_GET_SIG_CONTEXT
1497 dTHXa(PERL_GET_SIG_CONTEXT);
1498#else
85b332e2
CL
1499 dTHX;
1500#endif
1271a1be 1501#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1502#if defined(__cplusplus) && defined(__GNUC__)
1503 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1504 * parameters would be warned about. */
1505 PERL_UNUSED_ARG(sip);
1506 PERL_UNUSED_ARG(uap);
1507#endif
1271a1be 1508#endif
23ada85b 1509#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1510 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1511 if (PL_sig_ignoring[sig]) return;
85b332e2 1512#endif
2e34cc90 1513#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1514 if (PL_sig_defaulting[sig])
2e34cc90
CL
1515#ifdef KILL_BY_SIGPRC
1516 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1517#else
1518 exit(1);
1519#endif
1520#endif
406878dd 1521 if (
853d2c32
RGS
1522#ifdef SIGILL
1523 sig == SIGILL ||
1524#endif
1525#ifdef SIGBUS
1526 sig == SIGBUS ||
1527#endif
1528#ifdef SIGSEGV
1529 sig == SIGSEGV ||
1530#endif
1531 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1532 /* Call the perl level handler now--
31c91b43 1533 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1534#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1535 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1536#else
1537 (*PL_sighandlerp)(sig);
92807b6d 1538#endif
406878dd 1539 else {
31c91b43 1540 if (!PL_psig_pend) return;
406878dd
GA
1541 /* Set a flag to say this signal is pending, that is awaiting delivery after
1542 * the current Perl opcode completes */
1543 PL_psig_pend[sig]++;
1544
1545#ifndef SIG_PENDING_DIE_COUNT
1546# define SIG_PENDING_DIE_COUNT 120
1547#endif
fe13d51d 1548 /* Add one to say _a_ signal is pending */
406878dd
GA
1549 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1550 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1551 (unsigned long)SIG_PENDING_DIE_COUNT);
1552 }
0a8e0eff
NIS
1553}
1554
2e34cc90
CL
1555#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1556void
1557Perl_csighandler_init(void)
1558{
1559 int sig;
27da23d5 1560 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1561
1562 for (sig = 1; sig < SIG_SIZE; sig++) {
1563#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1564 dTHX;
27da23d5 1565 PL_sig_defaulting[sig] = 1;
5c1546dc 1566 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1567#endif
1568#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1569 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1570#endif
1571 }
27da23d5 1572 PL_sig_handlers_initted = 1;
2e34cc90
CL
1573}
1574#endif
1575
7fe50b8b
LT
1576#if defined HAS_SIGPROCMASK
1577static void
1578unblock_sigmask(pTHX_ void* newset)
1579{
dc3bf405 1580 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1581 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1582}
1583#endif
1584
0a8e0eff
NIS
1585void
1586Perl_despatch_signals(pTHX)
1587{
1588 int sig;
1589 PL_sig_pending = 0;
1590 for (sig = 1; sig < SIG_SIZE; sig++) {
1591 if (PL_psig_pend[sig]) {
d0166017 1592 dSAVE_ERRNO;
7fe50b8b 1593#ifdef HAS_SIGPROCMASK
55534442
LT
1594 /* From sigaction(2) (FreeBSD man page):
1595 * | Signal routines normally execute with the signal that
1596 * | caused their invocation blocked, but other signals may
1597 * | yet occur.
1598 * Emulation of this behavior (from within Perl) is enabled
1599 * using sigprocmask
1600 */
1601 int was_blocked;
1602 sigset_t newset, oldset;
1603
1604 sigemptyset(&newset);
1605 sigaddset(&newset, sig);
1606 sigprocmask(SIG_BLOCK, &newset, &oldset);
1607 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1608 if (!was_blocked) {
1609 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1610 ENTER;
1611 SAVEFREESV(save_sv);
1612 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1613 }
55534442 1614#endif
25da4428 1615 PL_psig_pend[sig] = 0;
6e324d09 1616#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1617 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1618#else
1619 (*PL_sighandlerp)(sig);
92807b6d 1620#endif
7fe50b8b 1621#ifdef HAS_SIGPROCMASK
55534442 1622 if (!was_blocked)
7fe50b8b 1623 LEAVE;
55534442 1624#endif
d0166017 1625 RESTORE_ERRNO;
0a8e0eff
NIS
1626 }
1627 }
1628}
1629
38a124f0 1630/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1631int
864dbfa3 1632Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1633{
27da23d5 1634 dVAR;
79072805 1635 I32 i;
cbbf8932 1636 SV** svp = NULL;
2d4fcd5e
AJ
1637 /* Need to be careful with SvREFCNT_dec(), because that can have side
1638 * effects (due to closures). We must make sure that the new disposition
1639 * is in place before it is called.
1640 */
cbbf8932 1641 SV* to_dec = NULL;
e72dc28c 1642 STRLEN len;
2d4fcd5e
AJ
1643#ifdef HAS_SIGPROCMASK
1644 sigset_t set, save;
1645 SV* save_sv;
1646#endif
eb578fdb 1647 const char *s = MgPV_const(mg,len);
7918f24d
NC
1648
1649 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1650
748a9306 1651 if (*s == '_') {
84c7b88c 1652 if (memEQs(s, len, "__DIE__"))
3280af22 1653 svp = &PL_diehook;
84c7b88c 1654 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1655 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1656 /* Merge the existing behaviours, which are as follows:
1657 magic_setsig, we always set svp to &PL_warnhook
1658 (hence we always change the warnings handler)
1659 For magic_clearsig, we don't change the warnings handler if it's
1660 set to the &PL_warnhook. */
3280af22 1661 svp = &PL_warnhook;
84c7b88c
BF
1662 } else if (sv) {
1663 SV *tmp = sv_newmortal();
1664 Perl_croak(aTHX_ "No such hook: %s",
1665 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1666 }
748a9306 1667 i = 0;
38a124f0 1668 if (svp && *svp) {
9289f461
RGS
1669 if (*svp != PERL_WARNHOOK_FATAL)
1670 to_dec = *svp;
cbbf8932 1671 *svp = NULL;
4633a7c4 1672 }
748a9306
LW
1673 }
1674 else {
708854f2
NC
1675 i = (I16)mg->mg_private;
1676 if (!i) {
84c7b88c 1677 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1678 mg->mg_private = (U16)i;
708854f2 1679 }
86d86cad 1680 if (i <= 0) {
84c7b88c
BF
1681 if (sv) {
1682 SV *tmp = sv_newmortal();
1683 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1684 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1685 }
748a9306
LW
1686 return 0;
1687 }
2d4fcd5e
AJ
1688#ifdef HAS_SIGPROCMASK
1689 /* Avoid having the signal arrive at a bad time, if possible. */
1690 sigemptyset(&set);
1691 sigaddset(&set,i);
1692 sigprocmask(SIG_BLOCK, &set, &save);
1693 ENTER;
9ff8e806 1694 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1695 SAVEFREESV(save_sv);
1696 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1697#endif
1698 PERL_ASYNC_CHECK();
2e34cc90 1699#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1700 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1701#endif
23ada85b 1702#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1703 PL_sig_ignoring[i] = 0;
85b332e2 1704#endif
2e34cc90 1705#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1706 PL_sig_defaulting[i] = 0;
2e34cc90 1707#endif
2d4fcd5e 1708 to_dec = PL_psig_ptr[i];
38a124f0
NC
1709 if (sv) {
1710 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1711 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1712
1713 /* Signals don't change name during the program's execution, so once
1714 they're cached in the appropriate slot of PL_psig_name, they can
1715 stay there.
1716
1717 Ideally we'd find some way of making SVs at (C) compile time, or
1718 at least, doing most of the work. */
1719 if (!PL_psig_name[i]) {
1720 PL_psig_name[i] = newSVpvn(s, len);
1721 SvREADONLY_on(PL_psig_name[i]);
1722 }
38a124f0 1723 } else {
79fd3822 1724 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1725 PL_psig_name[i] = NULL;
1726 PL_psig_ptr[i] = NULL;
1727 }
748a9306 1728 }
38a124f0 1729 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1730 if (i) {
5c1546dc 1731 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1732 }
748a9306 1733 else
b37c2d43 1734 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1735 } else {
9dfa190b
NC
1736 if (sv && SvOK(sv)) {
1737 s = SvPV_force(sv, len);
1738 } else {
1739 sv = NULL;
1740 }
84c7b88c 1741 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1742 if (i) {
23ada85b 1743#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1744 PL_sig_ignoring[i] = 1;
1745 (void)rsignal(i, PL_csighandlerp);
85b332e2 1746#else
9dfa190b 1747 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1748#endif
9dfa190b 1749 }
2d4fcd5e 1750 }
84c7b88c 1751 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1752 if (i) {
2e34cc90 1753#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1754 PL_sig_defaulting[i] = 1;
1755 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1756#else
9dfa190b 1757 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1758#endif
9dfa190b
NC
1759 }
1760 }
1761 else {
1762 /*
1763 * We should warn if HINT_STRICT_REFS, but without
1764 * access to a known hint bit in a known OP, we can't
1765 * tell whether HINT_STRICT_REFS is in force or not.
1766 */
0687887e 1767 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1768 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1769 SV_GMAGIC);
1770 if (i)
1771 (void)rsignal(i, PL_csighandlerp);
1772 else
1773 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1774 }
748a9306 1775 }
9dfa190b 1776
2d4fcd5e
AJ
1777#ifdef HAS_SIGPROCMASK
1778 if(i)
1779 LEAVE;
1780#endif
ef8d46e8 1781 SvREFCNT_dec(to_dec);
79072805
LW
1782 return 0;
1783}
64ca3a65 1784#endif /* !PERL_MICRO */
79072805
LW
1785
1786int
864dbfa3 1787Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1788{
7918f24d 1789 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1790 PERL_UNUSED_ARG(sv);
e1a479c5 1791
89c14e2e 1792 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1793 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1794 return 0;
1795
0e446081 1796 return magic_clearisa(NULL, mg);
463ee0b2
LW
1797}
1798
0e446081 1799/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1800int
52b45067
RD
1801Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1802{
52b45067 1803 HV* stash;
7918f24d
NC
1804 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1805
52b45067 1806 /* Bail out if destruction is going on */
627364f1 1807 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1808
0e446081
NC
1809 if (sv)
1810 av_clear(MUTABLE_AV(sv));
52b45067 1811
6624142a
FC
1812 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1813 /* This occurs with setisa_elem magic, which calls this
1814 same function. */
1815 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1816
316ebaf2 1817 assert(mg);
6624142a
FC
1818 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1819 SV **svp = AvARRAY((AV *)mg->mg_obj);
1820 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1821 while (items--) {
1822 stash = GvSTASH((GV *)*svp++);
1823 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1824 }
1825
1826 return 0;
1827 }
1828
52b45067 1829 stash = GvSTASH(
6624142a 1830 (const GV *)mg->mg_obj
52b45067
RD
1831 );
1832
00169e2c
FC
1833 /* The stash may have been detached from the symbol table, so check its
1834 name before doing anything. */
1835 if (stash && HvENAME_get(stash))
5562fa71 1836 mro_isa_changed_in(stash);
52b45067
RD
1837
1838 return 0;
1839}
1840
1841int
864dbfa3 1842Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1843{
85fbaab2 1844 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1845 I32 i = 0;
7918f24d
NC
1846
1847 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1848 PERL_UNUSED_ARG(mg);
7719e241 1849
6ff81951 1850 if (hv) {
497b47a8 1851 (void) hv_iterinit(hv);
ad64d0ec 1852 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1853 i = HvUSEDKEYS(hv);
497b47a8
JH
1854 else {
1855 while (hv_iternext(hv))
1856 i++;
1857 }
6ff81951
GS
1858 }
1859
1860 sv_setiv(sv, (IV)i);
1861 return 0;
1862}
1863
1864int
864dbfa3 1865Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1866{
7918f24d 1867 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1868 PERL_UNUSED_ARG(mg);
946ec16e 1869 if (LvTARG(sv)) {
85fbaab2 1870 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1871 }
1872 return 0;
ac27b0f5 1873}
946ec16e 1874
efaf3674
DM
1875/*
1876=for apidoc magic_methcall
1877
1878Invoke a magic method (like FETCH).
1879
2baee27b
FC
1880C<sv> and C<mg> are the tied thingy and the tie magic.
1881
1882C<meth> is the name of the method to call.
1883
1884C<argc> is the number of args (in addition to $self) to pass to the method.
1885
1886The C<flags> can be:
1887
1888 G_DISCARD invoke method with G_DISCARD flag and don't
1889 return a value
1890 G_UNDEF_FILL fill the stack with argc pointers to
1891 PL_sv_undef
1892
1893The arguments themselves are any values following the C<flags> argument.
efaf3674 1894
796b6530 1895Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1896
1897
1898=cut
1899*/
1900
1901SV*
36925d9e 1902Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1903 U32 argc, ...)
a0d0e21e
LW
1904{
1905 dSP;
efaf3674 1906 SV* ret = NULL;
463ee0b2 1907
7918f24d
NC
1908 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1909
efaf3674 1910 ENTER;
d1d7a15d
NC
1911
1912 if (flags & G_WRITING_TO_STDERR) {
1913 SAVETMPS;
1914
2782061f 1915 save_re_context();
d1d7a15d
NC
1916 SAVESPTR(PL_stderrgv);
1917 PL_stderrgv = NULL;
1918 }
1919
efaf3674 1920 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1921 PUSHMARK(SP);
efaf3674 1922
052a7c76
DM
1923 /* EXTEND() expects a signed argc; don't wrap when casting */
1924 assert(argc <= I32_MAX);
1925 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1926 PUSHs(SvTIED_obj(sv, mg));
1927 if (flags & G_UNDEF_FILL) {
1928 while (argc--) {
efaf3674 1929 PUSHs(&PL_sv_undef);
93965878 1930 }
67549bd2 1931 } else if (argc > 0) {
046b0c7d
NC
1932 va_list args;
1933 va_start(args, argc);
1934
1935 do {
1936 SV *const sv = va_arg(args, SV *);
1937 PUSHs(sv);
1938 } while (--argc);
1939
1940 va_end(args);
88e89b8a 1941 }
463ee0b2 1942 PUTBACK;
efaf3674 1943 if (flags & G_DISCARD) {
36925d9e 1944 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1945 }
1946 else {
36925d9e 1947 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1948 ret = *PL_stack_sp--;
1949 }
1950 POPSTACK;
d1d7a15d
NC
1951 if (flags & G_WRITING_TO_STDERR)
1952 FREETMPS;
efaf3674
DM
1953 LEAVE;
1954 return ret;
1955}
1956
efaf3674 1957/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1958
efaf3674 1959STATIC SV*
36925d9e 1960S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1961 int n, SV *val)
1962{
efaf3674
DM
1963 SV* arg1 = NULL;
1964
1965 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1966
1967 if (mg->mg_ptr) {
1968 if (mg->mg_len >= 0) {
db4b3a1d 1969 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1970 }
1971 else if (mg->mg_len == HEf_SVKEY)
1972 arg1 = MUTABLE_SV(mg->mg_ptr);
1973 }
1974 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1975 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1976 sv_2mortal(arg1);
1977 }
1978 if (!arg1) {
046b0c7d 1979 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1980 }
046b0c7d 1981 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1982}
1983
76e3520e 1984STATIC int
36925d9e 1985S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1986{
efaf3674 1987 SV* ret;
463ee0b2 1988
7918f24d
NC
1989 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1990
efaf3674
DM
1991 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1992 if (ret)
1993 sv_setsv(sv, ret);
a0d0e21e
LW
1994 return 0;
1995}
463ee0b2 1996
a0d0e21e 1997int
864dbfa3 1998Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1999{
7918f24d
NC
2000 PERL_ARGS_ASSERT_MAGIC_GETPACK;
2001
fd69380d 2002 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 2003 mg->mg_flags |= MGf_GSKIP;
36925d9e 2004 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
2005 return 0;
2006}
2007
2008int
864dbfa3 2009Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 2010{
b112cff9
DM
2011 MAGIC *tmg;
2012 SV *val;
7918f24d
NC
2013
2014 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2015
b112cff9
DM
2016 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2017 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2018 * public flags indicate its value based on copying from $val. Doing
2019 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2020 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2021 * wrong if $val happened to be tainted, as sv hasn't got magic
2022 * enabled, even though taint magic is in the chain. In which case,
2023 * fake up a temporary tainted value (this is easier than temporarily
2024 * re-enabling magic on sv). */
2025
284167a5 2026 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2027 && (tmg->mg_len & 1))
2028 {
2029 val = sv_mortalcopy(sv);
2030 SvTAINTED_on(val);
2031 }
2032 else
2033 val = sv;
2034
36925d9e 2035 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2036 return 0;
2037}
2038
2039int
864dbfa3 2040Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2041{
7918f24d
NC
2042 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2043
4c13be3f 2044 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2045 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2046}
463ee0b2 2047
93965878
NIS
2048
2049U32
864dbfa3 2050Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2051{
22846ab4 2052 I32 retval = 0;
efaf3674 2053 SV* retsv;
93965878 2054
7918f24d
NC
2055 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2056
36925d9e 2057 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2058 if (retsv) {
2059 retval = SvIV(retsv)-1;
22846ab4
AB
2060 if (retval < -1)
2061 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2062 }
22846ab4 2063 return (U32) retval;
93965878
NIS
2064}
2065
cea2e8a9
GS
2066int
2067Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2068{
7918f24d
NC
2069 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2070
36925d9e 2071 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2072 return 0;
2073}
2074
2075int
864dbfa3 2076Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2077{
efaf3674 2078 SV* ret;
463ee0b2 2079
7918f24d
NC
2080 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2081
36925d9e
RZ
2082 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2083 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2084 if (ret)
2085 sv_setsv(key,ret);
79072805
LW
2086 return 0;
2087}
2088
2089int
1146e912 2090Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2091{
7918f24d
NC
2092 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2093
36925d9e 2094 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2095}
a0d0e21e 2096
a3bcc51e
TP
2097SV *
2098Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2099{
5fcbf73d 2100 SV *retval;
ad64d0ec
NC
2101 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2102 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2103
7918f24d
NC
2104 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2105
a3bcc51e
TP
2106 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2107 SV *key;
bfcb3514 2108 if (HvEITER_get(hv))
a3bcc51e
TP
2109 /* we are in an iteration so the hash cannot be empty */
2110 return &PL_sv_yes;
2111 /* no xhv_eiter so now use FIRSTKEY */
2112 key = sv_newmortal();
ad64d0ec 2113 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2114 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2115 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2116 }
2117
2118 /* there is a SCALAR method that we can call */
36925d9e 2119 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2120 if (!retval)
5fcbf73d 2121 retval = &PL_sv_undef;
a3bcc51e
TP
2122 return retval;
2123}
2124
a0d0e21e 2125int
864dbfa3 2126Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2127{
089b5c60 2128 SV **svp;
7918f24d
NC
2129
2130 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2131
089b5c60
NC
2132 /* The magic ptr/len for the debugger's hash should always be an SV. */
2133 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2134 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2135 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2136 }
2137
2138 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2139 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2140 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2141 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2142
8772537c 2143 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2144 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2145 if (o) {
2146#ifdef PERL_DEBUG_READONLY_OPS
2147 Slab_to_rw(OpSLAB(o));
2148#endif
2149 /* set or clear breakpoint in the relevant control op */
089b5c60 2150 if (SvTRUE(sv))
88df5f01 2151 o->op_flags |= OPf_SPECIAL;
8772537c 2152 else
88df5f01
FC
2153 o->op_flags &= ~OPf_SPECIAL;
2154#ifdef PERL_DEBUG_READONLY_OPS
2155 Slab_to_ro(OpSLAB(o));
2156#endif
8772537c 2157 }
5df8de69 2158 }
79072805
LW
2159 return 0;
2160}
2161
2162int
8772537c 2163Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2164{
502c6561 2165 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2166
2167 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2168
83bf042f 2169 if (obj) {
e1dccc0d 2170 sv_setiv(sv, AvFILL(obj));
83bf042f 2171 } else {
3773545d 2172 sv_set_undef(sv);
83bf042f 2173 }
79072805
LW
2174 return 0;
2175}
2176
2177int
864dbfa3 2178Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2179{
502c6561 2180 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2181
2182 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2183
83bf042f 2184 if (obj) {
e1dccc0d 2185 av_fill(obj, SvIV(sv));
83bf042f 2186 } else {
a2a5de95
NC
2187 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2188 "Attempt to set length of freed array");
83bf042f
NC
2189 }
2190 return 0;
2191}
2192
2193int
83f29afa
VP
2194Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2195{
83f29afa
VP
2196 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2197 PERL_UNUSED_ARG(sv);
dc3bf405 2198 PERL_UNUSED_CONTEXT;
83f29afa
VP
2199
2200 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2201 if (sizeof(IV) == sizeof(SSize_t)) {
2202 *((IV *) &(mg->mg_len)) = 0;
2203 } else {
2204 if (mg->mg_ptr)
2205 *((IV *) mg->mg_ptr) = 0;
2206 }
83f29afa
VP
2207
2208 return 0;
2209}
2210
2211int
83bf042f
NC
2212Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2213{
7918f24d 2214 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2215 PERL_UNUSED_ARG(sv);
7918f24d 2216
94f3782b
DM
2217 /* during global destruction, mg_obj may already have been freed */
2218 if (PL_in_clean_all)
1ea47f64 2219 return 0;
94f3782b 2220
83bf042f
NC
2221 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2222
2223 if (mg) {
2224 /* arylen scalar holds a pointer back to the array, but doesn't own a
2225 reference. Hence the we (the array) are about to go away with it
2226 still pointing at us. Clear its pointer, else it would be pointing
2227 at free memory. See the comment in sv_magic about reference loops,
2228 and why it can't own a reference to us. */
2229 mg->mg_obj = 0;
2230 }
a0d0e21e
LW
2231 return 0;
2232}
2233
2234int
864dbfa3 2235Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2236{
16eb5365 2237 SV* const lsv = LvTARG(sv);
96c2a8ff 2238 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2239
2240 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2241 PERL_UNUSED_ARG(mg);
ac27b0f5 2242
6174b39a
FC
2243 if (found && found->mg_len != -1) {
2244 STRLEN i = found->mg_len;
25fdce4a 2245 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2246 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2247 sv_setuv(sv, i);
a0d0e21e 2248 return 0;
a0d0e21e 2249 }
3773545d 2250 sv_set_undef(sv);
a0d0e21e
LW
2251 return 0;
2252}
2253
2254int
864dbfa3 2255Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2256{
16eb5365 2257 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2258 SSize_t pos;
2259 STRLEN len;
53d44271 2260 MAGIC* found;
aec43834 2261 const char *s;
a0d0e21e 2262
7918f24d 2263 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2264 PERL_UNUSED_ARG(mg);
ac27b0f5 2265
96c2a8ff 2266 found = mg_find_mglob(lsv);
3881461a 2267 if (!found) {
a0d0e21e
LW
2268 if (!SvOK(sv))
2269 return 0;
96c2a8ff 2270 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2271 }
2272 else if (!SvOK(sv)) {
3881461a 2273 found->mg_len = -1;
a0d0e21e
LW
2274 return 0;
2275 }
aec43834 2276 s = SvPV_const(lsv, len);
a0d0e21e 2277
e1dccc0d 2278 pos = SvIV(sv);
a0ed51b3 2279
7e2040f0 2280 if (DO_UTF8(lsv)) {
19742f39 2281 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2282 if (ulen)
2283 len = ulen;
a0ed51b3
LW
2284 }
2285
a0d0e21e
LW
2286 if (pos < 0) {
2287 pos += len;
2288 if (pos < 0)
2289 pos = 0;
2290 }
eb160463 2291 else if (pos > (SSize_t)len)
a0d0e21e 2292 pos = len;
a0ed51b3 2293
3881461a 2294 found->mg_len = pos;
25fdce4a 2295 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2296
79072805
LW
2297 return 0;
2298}
2299
2300int
864dbfa3 2301Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2302{
2303 STRLEN len;
35a4481c 2304 SV * const lsv = LvTARG(sv);
b83604b4 2305 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2306 STRLEN offs = LvTARGOFF(sv);
2307 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2308 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2309 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2310
2311 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2312 PERL_UNUSED_ARG(mg);
6ff81951 2313
83f78d1a 2314 if (!translate_substr_offsets(
4ddea69a 2315 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2316 negoff ? -(IV)offs : (IV)offs, !negoff,
2317 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2318 )) {
2319 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2320 sv_set_undef(sv);
83f78d1a
FC
2321 return 0;
2322 }
2323
9aa983d2 2324 if (SvUTF8(lsv))
4ddea69a 2325 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2326 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2327 if (SvUTF8(lsv))
2ef4b674 2328 SvUTF8_on(sv);
6ff81951
GS
2329 return 0;
2330}
2331
2332int
864dbfa3 2333Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2334{
83f78d1a 2335 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2336 const char * const tmps = SvPV_const(sv, len);
dd374669 2337 SV * const lsv = LvTARG(sv);
777f7c56
EB
2338 STRLEN lvoff = LvTARGOFF(sv);
2339 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2340 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2341 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2342
2343 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2344 PERL_UNUSED_ARG(mg);
075a4a2b 2345
a74fb2cd
FC
2346 SvGETMAGIC(lsv);
2347 if (SvROK(lsv))
2348 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2349 "Attempt to use reference as lvalue in substr"
2350 );
fc061ed8
FC
2351 SvPV_force_nomg(lsv,lsv_len);
2352 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2353 if (!translate_substr_offsets(
2354 lsv_len,
2355 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2356 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2357 ))
2358 Perl_croak(aTHX_ "substr outside of string");
2359 oldtarglen = lvlen;
1aa99e6b 2360 if (DO_UTF8(sv)) {
73a087f0 2361 sv_utf8_upgrade_nomg(lsv);
d931b1be 2362 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2363 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2364 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2365 SvUTF8_on(lsv);
2366 }
0d336106 2367 else if (SvUTF8(lsv)) {
5fcbf73d 2368 const char *utf8;
d931b1be 2369 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2370 newtarglen = len;
5fcbf73d 2371 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2372 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2373 Safefree(utf8);
1aa99e6b 2374 }
b76f3ce2 2375 else {
a74fb2cd 2376 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2377 newtarglen = len;
b76f3ce2 2378 }
83f78d1a
FC
2379 if (!neglen) LvTARGLEN(sv) = newtarglen;
2380 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2381
79072805
LW
2382 return 0;
2383}
2384
2385int
864dbfa3 2386Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2387{
7918f24d 2388 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2389 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2390#ifdef NO_TAINT_SUPPORT
2391 PERL_UNUSED_ARG(mg);
2392#endif
7918f24d 2393
64ff300b 2394 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2395 return 0;
2396}
2397
2398int
864dbfa3 2399Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2400{
7918f24d 2401 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2402 PERL_UNUSED_ARG(sv);
7918f24d 2403
b01e650a 2404 /* update taint status */
284167a5 2405 if (TAINT_get)
b01e650a
DM
2406 mg->mg_len |= 1;
2407 else
2408 mg->mg_len &= ~1;
463ee0b2
LW
2409 return 0;
2410}
2411
2412int
864dbfa3 2413Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2414{
35a4481c 2415 SV * const lsv = LvTARG(sv);
1b92e694 2416 char errflags = LvFLAGS(sv);
7918f24d
NC
2417
2418 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2419 PERL_UNUSED_ARG(mg);
6ff81951 2420
1b92e694 2421 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2422 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2423 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2424
6ff81951
GS
2425 return 0;
2426}
2427
2428int
864dbfa3 2429Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2430{
7918f24d 2431 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2432 PERL_UNUSED_ARG(mg);
79072805
LW
2433 do_vecset(sv); /* XXX slurp this routine */
2434 return 0;
2435}
2436
13733cde
FC
2437SV *
2438Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2439{
a0714e2c 2440 SV *targ = NULL;
13733cde
FC
2441 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2442 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2443 assert(mg);
5f05dabc 2444 if (LvTARGLEN(sv)) {
68dc0745 2445 if (mg->mg_obj) {
8772537c 2446 SV * const ahv = LvTARG(sv);
85fbaab2 2447 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2448 if (he)
2449 targ = HeVAL(he);
68dc0745 2450 }
bbfdc870 2451 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2452 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2453 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2454 {
2455 if (SvRMAGICAL(av)) {
2456 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2457 targ = svp ? *svp : NULL;
2458 }
2459 else
bbfdc870 2460 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2461 }
68dc0745 2462 }
46da273f 2463 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2464 /* somebody else defined it for us */
2465 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2466 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2467 LvTARGLEN(sv) = 0;
2468 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2469 mg->mg_obj = NULL;
68dc0745
PP
2470 mg->mg_flags &= ~MGf_REFCOUNTED;
2471 }
13733cde 2472 return targ;
5f05dabc 2473 }
71be2cbc 2474 else
13733cde
FC
2475 return LvTARG(sv);
2476}
2477
2478int
2479Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2480{
2481 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2482
2483 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2484 return 0;
2485}
2486
2487int
864dbfa3 2488Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2489{
7918f24d 2490 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2491 PERL_UNUSED_ARG(mg);
71be2cbc 2492 if (LvTARGLEN(sv))
68dc0745
PP
2493 vivify_defelem(sv);
2494 if (LvTARG(sv)) {
5f05dabc 2495 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2496 SvSETMAGIC(LvTARG(sv));
2497 }
5f05dabc
PP
2498 return 0;
2499}
2500
71be2cbc 2501void
864dbfa3 2502Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2503{
74e13ce4 2504 MAGIC *mg;
a0714e2c 2505 SV *value = NULL;
71be2cbc 2506
7918f24d
NC
2507 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2508
14befaf4 2509 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2510 return;
68dc0745 2511 if (mg->mg_obj) {
8772537c 2512 SV * const ahv = LvTARG(sv);
85fbaab2 2513 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2514 if (he)
2515 value = HeVAL(he);
3280af22 2516 if (!value || value == &PL_sv_undef)
be2597df 2517 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2518 }
bbfdc870
FC
2519 else if (LvSTARGOFF(sv) < 0)
2520 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2521 else {
502c6561 2522 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2523 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2524 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2525 else {
bbfdc870 2526 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2527 if (!svp || !(value = *svp))
bbfdc870 2528 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2529 }
2530 }
b37c2d43 2531 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2532 SvREFCNT_dec(LvTARG(sv));
2533 LvTARG(sv) = value;
71be2cbc 2534 LvTARGLEN(sv) = 0;
68dc0745 2535 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2536 mg->mg_obj = NULL;
68dc0745 2537 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2538}
2539
2540int
1f1dcfb5
FC
2541Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2542{
2543 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2544 PERL_UNUSED_ARG(mg);
2545 sv_unmagic(sv, PERL_MAGIC_nonelem);
2546 return 0;
2547}
2548
2549int
864dbfa3 2550Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2551{
7918f24d 2552 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2553 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2554 return 0;
810b8aa5
GS
2555}
2556
2557int
864dbfa3 2558Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2559{
7918f24d 2560 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2561 PERL_UNUSED_CONTEXT;
0177730e 2562 PERL_UNUSED_ARG(sv);
565764a8 2563 mg->mg_len = -1;
93a17b20
LW
2564 return 0;
2565}
2566
2567int
864dbfa3 2568Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2569{
35a4481c 2570 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2571
7918f24d
NC
2572 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2573
79072805 2574 if (uf && uf->uf_set)
24f81a43 2575 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2576 return 0;
2577}
2578
c277df42 2579int
faf82a0b
AE
2580Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2581{
488344d2 2582 const char type = mg->mg_type;
7918f24d
NC
2583
2584 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2585
a5c7cb08
DM
2586 assert( type == PERL_MAGIC_fm
2587 || type == PERL_MAGIC_qr
2588 || type == PERL_MAGIC_bm);
488344d2 2589 return sv_unmagic(sv, type);
faf82a0b
AE
2590}
2591
7a4c00b4 2592#ifdef USE_LOCALE_COLLATE
79072805 2593int
864dbfa3 2594Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2595{
7918f24d
NC
2596 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2597
bbce6d69 2598 /*
838b5b74 2599 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2600 * and vanished with a faint plop.
2601 */
96a5add6 2602 PERL_UNUSED_CONTEXT;
8772537c 2603 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2604 if (mg->mg_ptr) {
2605 Safefree(mg->mg_ptr);
2606 mg->mg_ptr = NULL;
565764a8 2607 mg->mg_len = -1;
7a4c00b4 2608 }
bbce6d69
PP
2609 return 0;
2610}
7a4c00b4 2611#endif /* USE_LOCALE_COLLATE */
bbce6d69 2612
7e8c5dac
HS
2613/* Just clear the UTF-8 cache data. */
2614int
2615Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2616{
7918f24d 2617 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2618 PERL_UNUSED_CONTEXT;
8772537c 2619 PERL_UNUSED_ARG(sv);
7e8c5dac 2620 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2621 mg->mg_ptr = NULL;
7e8c5dac
HS
2622 mg->mg_len = -1; /* The mg_len holds the len cache. */
2623 return 0;
2624}
2625
bbce6d69 2626int
9cce4f9a
FC
2627Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2628{
9782ce69 2629 const char *bad = NULL;
9cce4f9a 2630 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2631 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2632 switch (mg->mg_private & OPpLVREF_TYPE) {
2633 case OPpLVREF_SV:
2634 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2635 bad = " SCALAR";
2636 break;
2637 case OPpLVREF_AV:
2638 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2639 bad = "n ARRAY";
2640 break;
2641 case OPpLVREF_HV:
2642 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2643 bad = " HASH";
2644 break;
2645 case OPpLVREF_CV:
2646 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2647 bad = " CODE";
2648 }
2649 if (bad)
26a50d99 2650 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2651 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2652 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2653 case 0:
2654 {
2655 SV * const old = PAD_SV(mg->mg_len);
2656 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2657 SvREFCNT_dec(old);
2658 break;
2659 }
2660 case SVt_PVGV:
2661 gv_setref(mg->mg_obj, sv);
2662 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2663 break;
2664 case SVt_PVAV:
2665 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2666 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2667 break;
2668 case SVt_PVHV:
7fcb36d5
JH
2669 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2670 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2671 }
d39c26a6
FC
2672 if (mg->mg_flags & MGf_PERSIST)
2673 NOOP; /* This sv is in use as an iterator var and will be reused,
2674 so we must leave the magic. */
2675 else
2676 /* This sv could be returned by the assignment op, so clear the
2677 magic, as lvrefs are an implementation detail that must not be
2678 leaked to the user. */
2679 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2680 return 0;
2681}
2682
f1540bed
JH
2683static void
2684S_set_dollarzero(pTHX_ SV *sv)
2685 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2686{
2687#ifdef USE_ITHREADS
2688 dVAR;
2689#endif
2690 const char *s;
2691 STRLEN len;
f1540bed
JH
2692#ifdef HAS_SETPROCTITLE
2693 /* The BSDs don't show the argv[] in ps(1) output, they
2694 * show a string from the process struct and provide
2695 * the setproctitle() routine to manipulate that. */
2696 if (PL_origalen != 1) {
2697 s = SvPV_const(sv, len);
38626956 2698# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2699 /* The leading "-" removes the "perl: " prefix,
2700 * but not the "(perl) suffix from the ps(1)
2701 * output, because that's what ps(1) shows if the
2702 * argv[] is modified. */
2703 setproctitle("-%s", s);
2704# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2705 /* This doesn't really work if you assume that
2706 * $0 = 'foobar'; will wipe out 'perl' from the $0
2707 * because in ps(1) output the result will be like
2708 * sprintf("perl: %s (perl)", s)
2709 * I guess this is a security feature:
2710 * one (a user process) cannot get rid of the original name.
2711 * --jhi */
2712 setproctitle("%s", s);
2713# endif
2714 }
2715#elif defined(__hpux) && defined(PSTAT_SETCMD)
2716 if (PL_origalen != 1) {
2717 union pstun un;
2718 s = SvPV_const(sv, len);
2719 un.pst_command = (char *)s;
2720 pstat(PSTAT_SETCMD, un, len, 0, 0);
2721 }
2722#else
2723 if (PL_origalen > 1) {
4f3e04fd 2724 I32 i;
f1540bed
JH
2725 /* PL_origalen is set in perl_parse(). */
2726 s = SvPV_force(sv,len);
2727 if (len >= (STRLEN)PL_origalen-1) {
2728 /* Longer than original, will be truncated. We assume that
2729 * PL_origalen bytes are available. */
2730 Copy(s, PL_origargv[0], PL_origalen-1, char);
2731 }
2732 else {
2733 /* Shorter than original, will be padded. */
2734#ifdef PERL_DARWIN
2735 /* Special case for Mac OS X: see [perl #38868] */
2736 const int pad = 0;
2737#else
2738 /* Is the space counterintuitive? Yes.
2739 * (You were expecting \0?)
2740 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2741 * --jhi */
2742 const int pad = ' ';
2743#endif
2744 Copy(s, PL_origargv[0], len, char);
2745 PL_origargv[0][len] = 0;
2746 memset(PL_origargv[0] + len + 1,
2747 pad, PL_origalen - len - 1);
2748 }
2749 PL_origargv[0][PL_origalen-1] = 0;
2750 for (i = 1; i < PL_origargc; i++)
2751 PL_origargv[i] = 0;
2752#ifdef HAS_PRCTL_SET_NAME
2753 /* Set the legacy process name in addition to the POSIX name on Linux */
2754 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2755 /* diag_listed_as: SKIPME */
2756 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2757 }
2758#endif
2759 }
2760#endif
2761}
2762
9cce4f9a 2763int
864dbfa3 2764Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2765{
20b7effb 2766#ifdef USE_ITHREADS
97aff369 2767 dVAR;
20b7effb 2768#endif
eb578fdb
KW
2769 I32 paren;
2770 const REGEXP * rx;
79072805 2771 I32 i;
8990e307 2772 STRLEN len;
125b9982 2773 MAGIC *tmg;
2fdbfb4d 2774
7918f24d
NC
2775 PERL_ARGS_ASSERT_MAGIC_SET;
2776
e91d8259 2777 if (!mg->mg_ptr) {
960b831f 2778 paren = mg->mg_len;
1e05feb3 2779 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2780 setparen_got_rx:
2fdbfb4d 2781 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2782 } else {
2fdbfb4d
AB
2783 /* Croak with a READONLY error when a numbered match var is
2784 * set without a previous pattern match. Unless it's C<local $1>
2785 */
e91d8259 2786 croakparen:
2fdbfb4d 2787 if (!PL_localizing) {
cb077ed2 2788 Perl_croak_no_modify();
2fdbfb4d
AB
2789 }
2790 }
e91d8259
NC
2791 return 0;
2792 }
2793
2794 switch (*mg->mg_ptr) {
748a9306 2795 case '\001': /* ^A */
f2da823f
FC
2796 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2797 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2798 FmLINES(PL_bodytarget) = 0;
2799 if (SvPOK(PL_bodytarget)) {
2800 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2801 char *e = SvEND(PL_bodytarget);
2802 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2803 FmLINES(PL_bodytarget)++;
2804 s++;
2805 }
2806 }
125b9982 2807 /* mg_set() has temporarily made sv non-magical */
284167a5 2808 if (TAINTING_get) {
125b9982
NT
2809 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2810 SvTAINTED_on(PL_bodytarget);
2811 else
2812 SvTAINTED_off(PL_bodytarget);
2813 }
748a9306 2814 break;
49460fe6 2815 case '\003': /* ^C */
f2338a2e 2816 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2817 break;
2818
79072805 2819 case '\004': /* ^D */
b4ab917c 2820#ifdef DEBUGGING
a9e2d2bf
DM
2821 {
2822 const char *s = SvPV_nolen_const(sv);
2823 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2824 if (DEBUG_x_TEST || DEBUG_B_TEST)
2825 dump_all_perl(!DEBUG_B_TEST);
2826 }
b4ab917c 2827#else
38ab35f8 2828 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2829#endif
79072805 2830 break;
28f23441 2831 case '\005': /* ^E */
d0063567 2832 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2833#ifdef VMS
38ab35f8 2834 set_vaxc_errno(SvIV(sv));
2abc681d 2835#elif defined(WIN32)
d0063567 2836 SetLastError( SvIV(sv) );
2abc681d 2837#elif defined(OS2)
38ab35f8 2838 os2_setsyserrno(SvIV(sv));
2abc681d 2839#else
d0063567 2840 /* will anyone ever use this? */
38ab35f8 2841 SETERRNO(SvIV(sv), 4);
22fae026 2842#endif
d0063567 2843 }
fd503f5c
DIM
2844 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2845 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2846 break;
79072805 2847 case '\006': /* ^F */
9f601cf3
TC
2848 if (mg->mg_ptr[1] == '\0') {
2849 PL_maxsysfd = SvIV(sv);
2850 }
2851 else if (strEQ(mg->mg_ptr + 1, "EATURE_BITS")) {
2852 PL_compiling.cop_features = SvUV(sv);
2853 }
79072805 2854 break;
a0d0e21e 2855 case '\010': /* ^H */
efa571ab
KW
2856 {
2857 U32 save_hints = PL_hints;
5d382c25 2858 PL_hints = SvUV(sv);
efa571ab
KW
2859
2860 /* If wasn't UTF-8, and now is, notify the parser */
2861 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2862 notify_parser_that_changed_to_utf8();
2863 }
2864 }
a0d0e21e 2865 break;
9d116dd7 2866 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2867 Safefree(PL_inplace);
bd61b366 2868 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2869 break;
d9bad346
FC
2870 case '\016': /* ^N */
2871 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2872 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2873 goto croakparen;
28f23441 2874 case '\017': /* ^O */
ac27b0f5 2875 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2876 Safefree(PL_osname);
bd61b366 2877 PL_osname = NULL;
3511154c
DM
2878 if (SvOK(sv)) {
2879 TAINT_PROPER("assigning to $^O");
2e0de35c 2880 PL_osname = savesvpv(sv);
3511154c 2881 }
ac27b0f5
NIS
2882 }
2883 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2884 STRLEN len;
2885 const char *const start = SvPV(sv, len);
b54fc2b6 2886 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2887 SV *tmp;
8b850bd5
NC
2888
2889
2890 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2891 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2892
2893 /* Opening for input is more common than opening for output, so
2894 ensure that hints for input are sooner on linked list. */
59cd0e26 2895 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2896 SvUTF8(sv))
2897 : newSVpvs_flags("", SvUTF8(sv));
2898 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2899 mg_set(tmp);
8b850bd5 2900
f747ebd6
Z
2901 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2902 SvUTF8(sv));
2903 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2904 mg_set(tmp);
ac27b0f5 2905 }
28f23441 2906 break;
79072805 2907 case '\020': /* ^P */
2fdbfb4d
AB
2908 PL_perldb = SvIV(sv);
2909 if (PL_perldb && !PL_DBsingle)
2910 init_debugger();
9b9e0be4 2911 break;
79072805 2912 case '\024': /* ^T */
88e89b8a 2913#ifdef BIG_TIME
6b88bc9c 2914 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2915#else
38ab35f8 2916 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2917#endif
79072805 2918 break;
e07ea26a
NC
2919 case '\025': /* ^UTF8CACHE */
2920 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2921 PL_utf8cache = (signed char) sv_2iv(sv);
2922 }
2923 break;
fde18df1 2924 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2925 if (*(mg->mg_ptr+1) == '\0') {
2926 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2927 i = SvIV(sv);
ac27b0f5 2928 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2929 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2930 }
599cee73 2931 }
0a378802 2932 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2933 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450 2934 if (!SvPOK(sv)) {
1113f30d
DM
2935 if (!specialWARN(PL_compiling.cop_warnings))
2936 PerlMemShared_free(PL_compiling.cop_warnings);
7e4f0450 2937 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2938 break;
2939 }
f4fc7782 2940 {
b5477537 2941 STRLEN len, i;
006c1a1d
Z
2942 int not_none = 0, not_all = 0;
2943 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2944 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2945 not_none |= ptr[i];
2946 not_all |= ptr[i] ^ 0x55;
f4fc7782 2947 }
006c1a1d 2948 if (!not_none) {
4243c432
NC
2949 if (!specialWARN(PL_compiling.cop_warnings))
2950 PerlMemShared_free(PL_compiling.cop_warnings);
2951 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2952 } else if (len >= WARNsize && !not_all) {
2953 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2954 PerlMemShared_free(PL_compiling.cop_warnings);
2955 PL_compiling.cop_warnings = pWARN_ALL;
2956 PL_dowarn |= G_WARN_ONCE ;
2957 }
d3a7d8c7 2958 else {
72dc9ed5
NC
2959 STRLEN len;
2960 const char *const p = SvPV_const(sv, len);
2961
2962 PL_compiling.cop_warnings
8ee4cf24 2963 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2964 p, len);
2965
d3a7d8c7
GS
2966 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2967 PL_dowarn |= G_WARN_ONCE ;
2968 }
f4fc7782 2969
d3a7d8c7 2970 }
4438c4b7 2971 }
971a9dd3 2972 }
8ca2a5d6
DD
2973#ifdef WIN32
2974 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2975 w32_sloppystat = (bool)sv_true(sv);
2976 }
2977#endif
79072805
LW
2978 break;
2979 case '.':
3280af22
NIS
2980 if (PL_localizing) {
2981 if (PL_localizing == 1)
7766f137 2982 SAVESPTR(PL_last_in_gv);
748a9306 2983 }
3280af22 2984 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2985 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2986 break;
2987 case '^':
acbe1b9d 2988 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2989 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2990 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2991 break;
2992 case '~':
acbe1b9d 2993 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2994 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2995 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2996 break;
2997 case '=':
acbe1b9d 2998 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2999 break;
3000 case '-':
acbe1b9d
FC
3001 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3002 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 3003 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
3004 break;
3005 case '%':
acbe1b9d 3006 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
3007 break;
3008 case '|':
4b65379b 3009 {
099be4f1 3010 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
3011 if(!io)
3012 break;
38ab35f8 3013 if ((SvIV(sv)) == 0)
4b65379b
CS
3014 IoFLAGS(io) &= ~IOf_FLUSH;
3015 else {
3016 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3017 PerlIO *ofp = IoOFP(io);
3018 if (ofp)
3019 (void)PerlIO_flush(ofp);
3020 IoFLAGS(io) |= IOf_FLUSH;
3021 }
3022 }
79072805
LW
3023 }
3024 break;
79072805 3025 case '/':
1ab48e3a 3026 {
1ab48e3a 3027 if (SvROK(sv)) {
8d37cdf7
DIM
3028 SV *referent = SvRV(sv);
3029 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3030 /* XXX: dodgy type check: This leaves me feeling dirty, but
3031 * the alternative is to copy pretty much the entire
3032 * sv_reftype() into this routine, or to do a full string
3033 * comparison on the return of sv_reftype() both of which
3034 * make me feel worse! NOTE, do not modify this comment
3035 * without reviewing the corresponding comment in
3036 * sv_reftype(). - Yves */
1ab48e3a 3037 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3038 IV val = SvIV(referent);
1ab48e3a 3039 if (val <= 0) {
520b6fb6
DIM
3040 sv_setsv(sv, PL_rs);
3041 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3042 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3043 }
3044 } else {
ddce084a 3045 sv_setsv(sv, PL_rs);
8d37cdf7 3046 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3047 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3048 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3049 }
3050 }
b3a2acfa 3051 SvREFCNT_dec(PL_rs);
520b6fb6 3052 PL_rs = newSVsv(sv);
b3a2acfa 3053 }
79072805
LW
3054 break;
3055 case '\\':
ef8d46e8 3056 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3057 if (SvOK(sv)) {
7889fe52 3058 PL_ors_sv = newSVsv(sv);
009c130f 3059 }
e3c19b7b 3060 else {
a0714e2c 3061 PL_ors_sv = NULL;
e3c19b7b 3062 }
79072805 3063 break;
7d69d4a6
FC
3064 case '[':
3065 if (SvIV(sv) != 0)
3066 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3067 break;
79072805 3068 case '?':
ff0cee69 3069#ifdef COMPLEX_STATUS
6b88bc9c 3070 if (PL_localizing == 2) {
41cb7b2b 3071 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3072 PL_statusvalue = LvTARGOFF(sv);
3073 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3074 }
3075 else
3076#endif
3077#ifdef VMSISH_STATUS
3078 if (VMSISH_STATUS)
fb38d079 3079 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3080 else
3081#endif
38ab35f8 3082 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3083 break;
3084 case '!':
93189314
JH
3085 {
3086#ifdef VMS
3087# define PERL_VMS_BANG vaxc$errno
3088#else
3089# define PERL_VMS_BANG 0
3090#endif
79c32fc2 3091#if defined(WIN32)
c9beaf97
SH
3092 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3093 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3094#else
91487cfc 3095 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3096 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3097#endif
93189314 3098 }
79072805
LW
3099 break;
3100 case '<':
985213f2 3101 {
b469f1e0 3102 /* XXX $< currently silently ignores failures */
dfff4baf 3103 const Uid_t new_uid = SvUID(sv);
985213f2 3104 PL_delaymagic_uid = new_uid;
3280af22
NIS
3105 if (PL_delaymagic) {
3106 PL_delaymagic |= DM_RUID;
79072805
LW
3107 break; /* don't do magic till later */
3108 }
3109#ifdef HAS_SETRUID
b469f1e0 3110 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3111#elif defined(HAS_SETREUID)
b469f1e0 3112 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3113#elif defined(HAS_SETRESUID)
b469f1e0 3114 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3115#else
985213f2 3116 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3117# ifdef PERL_DARWIN
75870ed3 3118 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3119 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3120 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3121# endif
b469f1e0 3122 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3123 } else {
cea2e8a9 3124 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3125 }
79072805 3126#endif
79072805 3127 break;
985213f2 3128 }
79072805 3129 case '>':
985213f2 3130 {
b469f1e0 3131 /* XXX $> currently silently ignores failures */
dfff4baf 3132 const Uid_t new_euid = SvUID(sv);
985213f2 3133 PL_delaymagic_euid = new_euid;
3280af22
NIS
3134 if (PL_delaymagic) {
3135 PL_delaymagic |= DM_EUID;
79072805
LW
3136 break; /* don't do magic till later */
3137 }
3138#ifdef HAS_SETEUID
b469f1e0 3139 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3140#elif defined(HAS_SETREUID)
b469f1e0 3141 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3142#elif defined(HAS_SETRESUID)
b469f1e0 3143 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3144#else
985213f2 3145 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3146 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3147 else {
cea2e8a9 3148 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3149 }
79072805 3150#endif
79072805 3151 break;
985213f2 3152 }
79072805 3153 case '(':
985213f2 3154 {
b469f1e0 3155 /* XXX $( currently silently ignores failures */
dfff4baf 3156 const Gid_t new_gid = SvGID(sv);
985213f2 3157 PL_delaymagic_gid = new_gid;
3280af22
NIS
3158 if (PL_delaymagic) {
3159 PL_delaymagic |= DM_RGID;
79072805
LW
3160 break; /* don't do magic till later */
3161 }
3162#ifdef HAS_SETRGID
b469f1e0 3163 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3164#elif defined(HAS_SETREGID)
b469f1e0 3165 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3166#elif defined(HAS_SETRESGID)
b469f1e0 3167 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3168#else
985213f2 3169 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3170 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3171 else {
cea2e8a9 3172 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3173 }
79072805 3174#endif
79072805 3175 break;
985213f2 3176 }
79072805 3177 case ')':
985213f2 3178 {
0635704a
HS
3179/* (hv) best guess: maybe we'll need configure probes to do a better job,
3180 * but you can override it if you need to.
3181 */
3182#ifndef INVALID_GID
3183#define INVALID_GID ((Gid_t)-1)
3184#endif
b469f1e0 3185 /* XXX $) currently silently ignores failures */
dfff4baf 3186 Gid_t new_egid;
5cd24f17
PP
3187#ifdef HAS_SETGROUPS
3188 {
b83604b4 3189 const char *p = SvPV_const(sv, len);
757f63d8 3190 Groups_t *gary = NULL;
79e302e6
MM
3191 const char* p_end = p + len;
3192 const char* endptr = p_end;
22ff3130 3193 UV uv;
fb4089e0 3194#ifdef _SC_NGROUPS_MAX
3195 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3196
3197 if (maxgrp < 0)
3198 maxgrp = NGROUPS;
3199#else
3200 int maxgrp = NGROUPS;
3201#endif
757f63d8
SP
3202
3203 while (isSPACE(*p))
3204 ++p;
22ff3130
HS
3205 if (grok_atoUV(p, &uv, &endptr))
3206 new_egid = (Gid_t)uv;
3207 else {
0635704a 3208 new_egid = INVALID_GID;
22ff3130
HS
3209 endptr = NULL;
3210 }
fb4089e0 3211 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3212 if (endptr == NULL)
3213 break;
3214 p = endptr;
79e302e6 3215 endptr = p_end;
757f63d8
SP
3216 while (isSPACE(*p))
3217 ++p;
3218 if (!*p)
3219 break;
fdadaf77 3220 if (!gary)
757f63d8
SP
3221 Newx(gary, i + 1, Groups_t);
3222 else
3223 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3224 if (grok_atoUV(p, &uv, &endptr))
3225 gary[i] = (Groups_t)uv;
3226 else {
0635704a 3227 gary[i] = INVALID_GID;
22ff3130
HS
3228 endptr = NULL;
3229 }
757f63d8
SP
3230 }
3231 if (i)
b469f1e0 3232 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3233 Safefree(gary);
5cd24f17
PP
3234 }
3235#else /* HAS_SETGROUPS */
dfff4baf 3236 new_egid = SvGID(sv);
5cd24f17 3237#endif /* HAS_SETGROUPS */
985213f2 3238 PL_delaymagic_egid = new_egid;
3280af22
NIS
3239 if (PL_delaymagic) {
3240 PL_delaymagic |= DM_EGID;
79072805
LW
3241 break; /* don't do magic till later */
3242 }
3243#ifdef HAS_SETEGID
b469f1e0 3244 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3245#elif defined(HAS_SETREGID)
b469f1e0 3246 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3247#elif defined(HAS_SETRESGID)
b469f1e0 3248 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3249#else
985213f2 3250 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3251 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3252 else {
cea2e8a9 3253 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3254 }
79072805 3255#endif
79072805 3256 break;
985213f2 3257 }
79072805 3258 case ':':
2d8e6c8d 3259 PL_chopset = SvPV_force(sv,len);
79072805 3260 break;
9cdac2a2
FC
3261 case '$': /* $$ */
3262 /* Store the pid in mg->mg_obj so we can tell when a fork has
3263 occurred. mg->mg_obj points to *$ by default, so clear it. */
3264 if (isGV(mg->mg_obj)) {
3265 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3266 SvREFCNT_dec(mg->mg_obj);
3267 mg->mg_flags |= MGf_REFCOUNTED;
3268 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3269 }
3270 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3271 break;
79072805 3272 case '0':
e2975953 3273 LOCK_DOLLARZERO_MUTEX;
f1540bed 3274 S_set_dollarzero(aTHX_ sv);
e2975953 3275 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3276 break;
3277 }
3278 return 0;
3279}
3280
3281I32
84c7b88c
BF
3282Perl_whichsig_sv(pTHX_ SV *sigsv)
3283{
3284 const char *sigpv;
3285 STRLEN siglen;
3286 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3287 sigpv = SvPV_const(sigsv, siglen);
3288 return whichsig_pvn(sigpv, siglen);
3289}
3290
3291I32
3292Perl_whichsig_pv(pTHX_ const char *sig)
3293{
3294 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3295 return whichsig_pvn(sig, strlen(sig));
3296}
3297
3298I32
3299Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3300{
eb578fdb 3301 char* const* sigv;
7918f24d 3302
84c7b88c 3303 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3304 PERL_UNUSED_CONTEXT;
79072805 3305
aadb217d 3306 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3307 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3308 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3309#ifdef SIGCLD
84c7b88c 3310 if (memEQs(sig, len, "CHLD"))
79072805
LW
3311 return SIGCLD;
3312#endif
3313#ifdef SIGCHLD
84c7b88c 3314 if (memEQs(sig, len, "CLD"))
79072805
LW
3315 return SIGCHLD;
3316#endif
7f1236c0 3317 return -1;
79072805
LW
3318}
3319
ecfc5424 3320Signal_t
1e82f5a6 3321#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3322Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3323#else
3324Perl_sighandler(int sig)
3325#endif
79072805 3326{
1018e26f
NIS
3327#ifdef PERL_GET_SIG_CONTEXT
3328 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3329#else
cea2e8a9 3330 dTHX;
71d280e3 3331#endif
79072805 3332 dSP;
a0714e2c
SS
3333 GV *gv = NULL;
3334 SV *sv = NULL;
8772537c 3335 SV * const tSv = PL_Sv;
601f1833 3336 CV *cv = NULL;
533c011a 3337 OP *myop = PL_op;
84902520 3338 U32 flags = 0;
8772537c 3339 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3340 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3341 SV *errsv_save = NULL;
71d280e3 3342
84902520 3343
727405f8 3344 if (!PL_psig_ptr[sig]) {
99ef548b 3345 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3346 PL_sig_name[sig]);
3347 exit(sig);
3348 }
ff0cee69 3349
a0d63a7b
DM
3350 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3351 /* Max number of items pushed there is 3*n or 4. We cannot fix
3352 infinity, so we fix 4 (in fact 5): */
3353 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3354 flags |= 1;
3355 PL_savestack_ix += 5; /* Protect save in progress. */
3356 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3357 }
84902520 3358 }
84902520 3359 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3360 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3361 || SvTYPE(cv) != SVt_PVCV) {
3362 HV *st;
f2c0649b 3363 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3364 }
84902520 3365
a0d0e21e 3366 if (!cv || !CvROOT(cv)) {
07c325bb 3367 const HEK * const hek = gv
1d6bb9ae
FC
3368 ? GvENAME_HEK(gv)
3369 : cv && CvNAMED(cv)
3370 ? CvNAME_HEK(cv)
07c325bb
FC
3371 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3372 if (hek)
3373 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3374 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3375 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3376 /* diag_listed_as: SIG%s handler "%s" not defined */
3377 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3378 "SIG%s handler \"__ANON__\" not defined.\n",
3379 PL_sig_name[sig]);
00d579c5 3380 goto cleanup;
79072805
LW
3381 }
3382
0c4d3b5e
DM
3383 sv = PL_psig_name[sig]
3384 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3385 : newSVpv(PL_sig_name[sig],0);
72048cfe 3386 flags |= 8;
0c4d3b5e
DM
3387 SAVEFREESV(sv);
3388
a0d63a7b
DM
3389 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3390 /* make sure our assumption about the size of the SAVEs are correct:
3391 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3392 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3393 }
e336de0d 3394
e788e7d3 3395 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3396 PUSHMARK(SP);
79072805 3397 PUSHs(sv);
8aad04aa
JH
3398#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3399 {
3400 struct sigaction oact;
3401
3402 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3403 if (sip) {
3404 HV *sih = newHV();
ad64d0ec 3405 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3406 /* The siginfo fields signo, code, errno, pid, uid,
3407 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3408 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3409 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3410#ifdef HAS_SIGINFO_SI_ERRNO
3411 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3412#endif
3413#ifdef HAS_SIGINFO_SI_STATUS
3414 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3415#endif
3416#ifdef HAS_SIGINFO_SI_UID
3417 {
3418 SV *uid = newSV(0);
3419 sv_setuid(uid, sip->si_uid);
3420 (void)hv_stores(sih, "uid", uid);
3421 }
3422#endif
3423#ifdef HAS_SIGINFO_SI_PID
3424 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3425#endif
3426#ifdef HAS_SIGINFO_SI_ADDR
3427 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3428#endif
3429#ifdef HAS_SIGINFO_SI_BAND
3430 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3431#endif
8aad04aa 3432 EXTEND(SP, 2);
ad64d0ec 3433 PUSHs(rv);
22f1178f 3434 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3435 }
b4552a27 3436
8aad04aa
JH
3437 }
3438 }
3439#endif
79072805 3440 PUTBACK;
a0d0e21e 3441
100c03aa
JL
3442 errsv_save = newSVsv(ERRSV);
3443
ad64d0ec 3444 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3445
d3acc0f7 3446 POPSTACK;
eed484f9
DD
3447 {
3448 SV * const errsv = ERRSV;
3449 if (SvTRUE_NN(errsv)) {
3450 SvREFCNT_dec(errsv_save);
c22d665b 3451#ifndef PERL_MICRO
1b266415
NIS
3452 /* Handler "died", for example to get out of a restart-able read().
3453 * Before we re-do that on its behalf re-enable the signal which was
3454 * blocked by the system when we entered.
3455 */
c22d665b 3456#ifdef HAS_SIGPROCMASK
d488af49 3457#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3458 if (sip || uap)
c22d665b 3459#endif
eed484f9
DD
3460 {
3461 sigset_t set;
3462 sigemptyset(&set);
3463 sigaddset(&set,sig);
3464 sigprocmask(SIG_UNBLOCK, &set, NULL);
3465 }
c22d665b 3466#else
eed484f9
DD
3467 /* Not clear if this will work */
3468 (void)rsignal(sig, SIG_IGN);