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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
5e7940ce 65#ifdef PERL_USE_3ARG_SIGHANDLER
e7124897 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
5e7940ce 1490#ifdef PERL_USE_3ARG_SIGHANDLER
e7124897 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
5e7940ce
DM
1501
1502#ifdef PERL_USE_3ARG_SIGHANDLER
ffb6256b
JH
1503#if defined(__cplusplus) && defined(__GNUC__)
1504 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1505 * parameters would be warned about. */
1506 PERL_UNUSED_ARG(sip);
1507 PERL_UNUSED_ARG(uap);
1508#endif
1271a1be 1509#endif
5e7940ce 1510
23ada85b 1511#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1512 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1513 if (PL_sig_ignoring[sig]) return;
85b332e2 1514#endif
2e34cc90 1515#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1516 if (PL_sig_defaulting[sig])
2e34cc90
CL
1517#ifdef KILL_BY_SIGPRC
1518 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1519#else
1520 exit(1);
1521#endif
1522#endif
406878dd 1523 if (
853d2c32
RGS
1524#ifdef SIGILL
1525 sig == SIGILL ||
1526#endif
1527#ifdef SIGBUS
1528 sig == SIGBUS ||
1529#endif
1530#ifdef SIGSEGV
1531 sig == SIGSEGV ||
1532#endif
1533 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1534 /* Call the perl level handler now--
31c91b43 1535 * with risk we may be in malloc() or being destructed etc. */
8a5e470b
DM
1536 {
1537 if (PL_sighandlerp == Perl_sighandler)
1538 /* default handler, so can call perly_sighandler() directly
1539 * rather than via Perl_sighandler, passing the extra
1540 * 'safe = false' arg
1541 */
ddb513d5 1542 Perl_perly_sighandler(sig, NULL, NULL, 0 /* unsafe */);
8a5e470b 1543 else
5e7940ce 1544#ifdef PERL_USE_3ARG_SIGHANDLER
8a5e470b 1545 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09 1546#else
8a5e470b 1547 (*PL_sighandlerp)(sig);
92807b6d 1548#endif
8a5e470b 1549 }
406878dd 1550 else {
31c91b43 1551 if (!PL_psig_pend) return;
406878dd
GA
1552 /* Set a flag to say this signal is pending, that is awaiting delivery after
1553 * the current Perl opcode completes */
1554 PL_psig_pend[sig]++;
1555
1556#ifndef SIG_PENDING_DIE_COUNT
1557# define SIG_PENDING_DIE_COUNT 120
1558#endif
fe13d51d 1559 /* Add one to say _a_ signal is pending */
406878dd
GA
1560 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1561 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1562 (unsigned long)SIG_PENDING_DIE_COUNT);
1563 }
0a8e0eff
NIS
1564}
1565
2e34cc90
CL
1566#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1567void
1568Perl_csighandler_init(void)
1569{
1570 int sig;
27da23d5 1571 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1572
1573 for (sig = 1; sig < SIG_SIZE; sig++) {
1574#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1575 dTHX;
27da23d5 1576 PL_sig_defaulting[sig] = 1;
5c1546dc 1577 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1578#endif
1579#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1580 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1581#endif
1582 }
27da23d5 1583 PL_sig_handlers_initted = 1;
2e34cc90
CL
1584}
1585#endif
1586
7fe50b8b
LT
1587#if defined HAS_SIGPROCMASK
1588static void
1589unblock_sigmask(pTHX_ void* newset)
1590{
dc3bf405 1591 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1592 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1593}
1594#endif
1595
0a8e0eff
NIS
1596void
1597Perl_despatch_signals(pTHX)
1598{
1599 int sig;
1600 PL_sig_pending = 0;
1601 for (sig = 1; sig < SIG_SIZE; sig++) {
1602 if (PL_psig_pend[sig]) {
d0166017 1603 dSAVE_ERRNO;
7fe50b8b 1604#ifdef HAS_SIGPROCMASK
55534442
LT
1605 /* From sigaction(2) (FreeBSD man page):
1606 * | Signal routines normally execute with the signal that
1607 * | caused their invocation blocked, but other signals may
1608 * | yet occur.
1609 * Emulation of this behavior (from within Perl) is enabled
1610 * using sigprocmask
1611 */
1612 int was_blocked;
1613 sigset_t newset, oldset;
1614
1615 sigemptyset(&newset);
1616 sigaddset(&newset, sig);
1617 sigprocmask(SIG_BLOCK, &newset, &oldset);
1618 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1619 if (!was_blocked) {
1620 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1621 ENTER;
1622 SAVEFREESV(save_sv);
1623 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1624 }
55534442 1625#endif
25da4428 1626 PL_psig_pend[sig] = 0;
8a5e470b
DM
1627 if (PL_sighandlerp == Perl_sighandler)
1628 /* default handler, so can call perly_sighandler() directly
1629 * rather than via Perl_sighandler, passing the extra
1630 * 'safe = true' arg
1631 */
1632 Perl_perly_sighandler(sig, NULL, NULL, 1 /* safe */);
1633 else
5e7940ce 1634#ifdef PERL_USE_3ARG_SIGHANDLER
8a5e470b 1635 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09 1636#else
8a5e470b 1637 (*PL_sighandlerp)(sig);
92807b6d 1638#endif
8a5e470b 1639
7fe50b8b 1640#ifdef HAS_SIGPROCMASK
55534442 1641 if (!was_blocked)
7fe50b8b 1642 LEAVE;
55534442 1643#endif
d0166017 1644 RESTORE_ERRNO;
0a8e0eff
NIS
1645 }
1646 }
1647}
1648
38a124f0 1649/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1650int
864dbfa3 1651Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1652{
27da23d5 1653 dVAR;
79072805 1654 I32 i;
cbbf8932 1655 SV** svp = NULL;
2d4fcd5e
AJ
1656 /* Need to be careful with SvREFCNT_dec(), because that can have side
1657 * effects (due to closures). We must make sure that the new disposition
1658 * is in place before it is called.
1659 */
cbbf8932 1660 SV* to_dec = NULL;
e72dc28c 1661 STRLEN len;
2d4fcd5e
AJ
1662#ifdef HAS_SIGPROCMASK
1663 sigset_t set, save;
1664 SV* save_sv;
1665#endif
eb578fdb 1666 const char *s = MgPV_const(mg,len);
7918f24d
NC
1667
1668 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1669
748a9306 1670 if (*s == '_') {
84c7b88c 1671 if (memEQs(s, len, "__DIE__"))
3280af22 1672 svp = &PL_diehook;
84c7b88c 1673 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1674 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1675 /* Merge the existing behaviours, which are as follows:
1676 magic_setsig, we always set svp to &PL_warnhook
1677 (hence we always change the warnings handler)
1678 For magic_clearsig, we don't change the warnings handler if it's
1679 set to the &PL_warnhook. */
3280af22 1680 svp = &PL_warnhook;
84c7b88c
BF
1681 } else if (sv) {
1682 SV *tmp = sv_newmortal();
1683 Perl_croak(aTHX_ "No such hook: %s",
1684 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1685 }
748a9306 1686 i = 0;
38a124f0 1687 if (svp && *svp) {
9289f461
RGS
1688 if (*svp != PERL_WARNHOOK_FATAL)
1689 to_dec = *svp;
cbbf8932 1690 *svp = NULL;
4633a7c4 1691 }
748a9306
LW
1692 }
1693 else {
708854f2
NC
1694 i = (I16)mg->mg_private;
1695 if (!i) {
84c7b88c 1696 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1697 mg->mg_private = (U16)i;
708854f2 1698 }
86d86cad 1699 if (i <= 0) {
84c7b88c
BF
1700 if (sv) {
1701 SV *tmp = sv_newmortal();
1702 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1703 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1704 }
748a9306
LW
1705 return 0;
1706 }
2d4fcd5e
AJ
1707#ifdef HAS_SIGPROCMASK
1708 /* Avoid having the signal arrive at a bad time, if possible. */
1709 sigemptyset(&set);
1710 sigaddset(&set,i);
1711 sigprocmask(SIG_BLOCK, &set, &save);
1712 ENTER;
9ff8e806 1713 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1714 SAVEFREESV(save_sv);
1715 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1716#endif
1717 PERL_ASYNC_CHECK();
2e34cc90 1718#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1719 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1720#endif
23ada85b 1721#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1722 PL_sig_ignoring[i] = 0;
85b332e2 1723#endif
2e34cc90 1724#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1725 PL_sig_defaulting[i] = 0;
2e34cc90 1726#endif
2d4fcd5e 1727 to_dec = PL_psig_ptr[i];
38a124f0
NC
1728 if (sv) {
1729 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1730 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1731
1732 /* Signals don't change name during the program's execution, so once
1733 they're cached in the appropriate slot of PL_psig_name, they can
1734 stay there.
1735
1736 Ideally we'd find some way of making SVs at (C) compile time, or
1737 at least, doing most of the work. */
1738 if (!PL_psig_name[i]) {
1739 PL_psig_name[i] = newSVpvn(s, len);
1740 SvREADONLY_on(PL_psig_name[i]);
1741 }
38a124f0 1742 } else {
79fd3822 1743 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1744 PL_psig_name[i] = NULL;
1745 PL_psig_ptr[i] = NULL;
1746 }
748a9306 1747 }
38a124f0 1748 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1749 if (i) {
5c1546dc 1750 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1751 }
748a9306 1752 else
b37c2d43 1753 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1754 } else {
9dfa190b
NC
1755 if (sv && SvOK(sv)) {
1756 s = SvPV_force(sv, len);
1757 } else {
1758 sv = NULL;
1759 }
84c7b88c 1760 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1761 if (i) {
23ada85b 1762#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1763 PL_sig_ignoring[i] = 1;
1764 (void)rsignal(i, PL_csighandlerp);
85b332e2 1765#else
9dfa190b 1766 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1767#endif
9dfa190b 1768 }
2d4fcd5e 1769 }
84c7b88c 1770 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1771 if (i) {
2e34cc90 1772#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1773 PL_sig_defaulting[i] = 1;
1774 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1775#else
9dfa190b 1776 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1777#endif
9dfa190b
NC
1778 }
1779 }
1780 else {
1781 /*
1782 * We should warn if HINT_STRICT_REFS, but without
1783 * access to a known hint bit in a known OP, we can't
1784 * tell whether HINT_STRICT_REFS is in force or not.
1785 */
0687887e 1786 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1787 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1788 SV_GMAGIC);
1789 if (i)
1790 (void)rsignal(i, PL_csighandlerp);
1791 else
1792 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1793 }
748a9306 1794 }
9dfa190b 1795
2d4fcd5e
AJ
1796#ifdef HAS_SIGPROCMASK
1797 if(i)
1798 LEAVE;
1799#endif
ef8d46e8 1800 SvREFCNT_dec(to_dec);
79072805
LW
1801 return 0;
1802}
64ca3a65 1803#endif /* !PERL_MICRO */
79072805
LW
1804
1805int
864dbfa3 1806Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1807{
7918f24d 1808 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1809 PERL_UNUSED_ARG(sv);
e1a479c5 1810
89c14e2e 1811 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1812 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1813 return 0;
1814
0e446081 1815 return magic_clearisa(NULL, mg);
463ee0b2
LW
1816}
1817
0e446081 1818/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1819int
52b45067
RD
1820Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1821{
52b45067 1822 HV* stash;
7918f24d
NC
1823 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1824
52b45067 1825 /* Bail out if destruction is going on */
627364f1 1826 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1827
0e446081
NC
1828 if (sv)
1829 av_clear(MUTABLE_AV(sv));
52b45067 1830
6624142a
FC
1831 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1832 /* This occurs with setisa_elem magic, which calls this
1833 same function. */
1834 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1835
316ebaf2 1836 assert(mg);
6624142a
FC
1837 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1838 SV **svp = AvARRAY((AV *)mg->mg_obj);
1839 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1840 while (items--) {
1841 stash = GvSTASH((GV *)*svp++);
1842 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1843 }
1844
1845 return 0;
1846 }
1847
52b45067 1848 stash = GvSTASH(
6624142a 1849 (const GV *)mg->mg_obj
52b45067
RD
1850 );
1851
00169e2c
FC
1852 /* The stash may have been detached from the symbol table, so check its
1853 name before doing anything. */
1854 if (stash && HvENAME_get(stash))
5562fa71 1855 mro_isa_changed_in(stash);
52b45067
RD
1856
1857 return 0;
1858}
1859
1860int
864dbfa3 1861Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1862{
85fbaab2 1863 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1864 I32 i = 0;
7918f24d
NC
1865
1866 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1867 PERL_UNUSED_ARG(mg);
7719e241 1868
6ff81951 1869 if (hv) {
497b47a8 1870 (void) hv_iterinit(hv);
ad64d0ec 1871 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1872 i = HvUSEDKEYS(hv);
497b47a8
JH
1873 else {
1874 while (hv_iternext(hv))
1875 i++;
1876 }
6ff81951
GS
1877 }
1878
1879 sv_setiv(sv, (IV)i);
1880 return 0;
1881}
1882
1883int
864dbfa3 1884Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1885{
7918f24d 1886 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1887 PERL_UNUSED_ARG(mg);
946ec16e 1888 if (LvTARG(sv)) {
85fbaab2 1889 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1890 }
1891 return 0;
ac27b0f5 1892}
946ec16e 1893
efaf3674
DM
1894/*
1895=for apidoc magic_methcall
1896
1897Invoke a magic method (like FETCH).
1898
2baee27b
FC
1899C<sv> and C<mg> are the tied thingy and the tie magic.
1900
1901C<meth> is the name of the method to call.
1902
1903C<argc> is the number of args (in addition to $self) to pass to the method.
1904
1905The C<flags> can be:
1906
1907 G_DISCARD invoke method with G_DISCARD flag and don't
1908 return a value
1909 G_UNDEF_FILL fill the stack with argc pointers to
1910 PL_sv_undef
1911
1912The arguments themselves are any values following the C<flags> argument.
efaf3674 1913
796b6530 1914Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1915
1916
1917=cut
1918*/
1919
1920SV*
36925d9e 1921Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1922 U32 argc, ...)
a0d0e21e
LW
1923{
1924 dSP;
efaf3674 1925 SV* ret = NULL;
463ee0b2 1926
7918f24d
NC
1927 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1928
efaf3674 1929 ENTER;
d1d7a15d
NC
1930
1931 if (flags & G_WRITING_TO_STDERR) {
1932 SAVETMPS;
1933
2782061f 1934 save_re_context();
d1d7a15d
NC
1935 SAVESPTR(PL_stderrgv);
1936 PL_stderrgv = NULL;
1937 }
1938
efaf3674 1939 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1940 PUSHMARK(SP);
efaf3674 1941
052a7c76
DM
1942 /* EXTEND() expects a signed argc; don't wrap when casting */
1943 assert(argc <= I32_MAX);
1944 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1945 PUSHs(SvTIED_obj(sv, mg));
1946 if (flags & G_UNDEF_FILL) {
1947 while (argc--) {
efaf3674 1948 PUSHs(&PL_sv_undef);
93965878 1949 }
67549bd2 1950 } else if (argc > 0) {
046b0c7d
NC
1951 va_list args;
1952 va_start(args, argc);
1953
1954 do {
35bc1e35
JK
1955 SV *const this_sv = va_arg(args, SV *);
1956 PUSHs(this_sv);
046b0c7d
NC
1957 } while (--argc);
1958
1959 va_end(args);
88e89b8a 1960 }
463ee0b2 1961 PUTBACK;
efaf3674 1962 if (flags & G_DISCARD) {
36925d9e 1963 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1964 }
1965 else {
36925d9e 1966 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1967 ret = *PL_stack_sp--;
1968 }
1969 POPSTACK;
d1d7a15d
NC
1970 if (flags & G_WRITING_TO_STDERR)
1971 FREETMPS;
efaf3674
DM
1972 LEAVE;
1973 return ret;
1974}
1975
efaf3674 1976/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1977
efaf3674 1978STATIC SV*
36925d9e 1979S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1980 int n, SV *val)
1981{
efaf3674
DM
1982 SV* arg1 = NULL;
1983
1984 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1985
1986 if (mg->mg_ptr) {
1987 if (mg->mg_len >= 0) {
db4b3a1d 1988 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1989 }
1990 else if (mg->mg_len == HEf_SVKEY)
1991 arg1 = MUTABLE_SV(mg->mg_ptr);
1992 }
1993 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1994 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1995 sv_2mortal(arg1);
1996 }
1997 if (!arg1) {
046b0c7d 1998 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1999 }
046b0c7d 2000 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
2001}
2002
76e3520e 2003STATIC int
36925d9e 2004S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 2005{
efaf3674 2006 SV* ret;
463ee0b2 2007
7918f24d
NC
2008 PERL_ARGS_ASSERT_MAGIC_METHPACK;
2009
efaf3674
DM
2010 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
2011 if (ret)
2012 sv_setsv(sv, ret);
a0d0e21e
LW
2013 return 0;
2014}
463ee0b2 2015
a0d0e21e 2016int
864dbfa3 2017Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2018{
7918f24d
NC
2019 PERL_ARGS_ASSERT_MAGIC_GETPACK;
2020
fd69380d 2021 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 2022 mg->mg_flags |= MGf_GSKIP;
36925d9e 2023 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
2024 return 0;
2025}
2026
2027int
864dbfa3 2028Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 2029{
b112cff9
DM
2030 MAGIC *tmg;
2031 SV *val;
7918f24d
NC
2032
2033 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2034
b112cff9
DM
2035 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2036 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2037 * public flags indicate its value based on copying from $val. Doing
2038 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2039 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2040 * wrong if $val happened to be tainted, as sv hasn't got magic
2041 * enabled, even though taint magic is in the chain. In which case,
2042 * fake up a temporary tainted value (this is easier than temporarily
2043 * re-enabling magic on sv). */
2044
284167a5 2045 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2046 && (tmg->mg_len & 1))
2047 {
2048 val = sv_mortalcopy(sv);
2049 SvTAINTED_on(val);
2050 }
2051 else
2052 val = sv;
2053
36925d9e 2054 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2055 return 0;
2056}
2057
2058int
864dbfa3 2059Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2060{
7918f24d
NC
2061 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2062
4c13be3f 2063 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2064 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2065}
463ee0b2 2066
93965878
NIS
2067
2068U32
864dbfa3 2069Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2070{
22846ab4 2071 I32 retval = 0;
efaf3674 2072 SV* retsv;
93965878 2073
7918f24d
NC
2074 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2075
36925d9e 2076 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2077 if (retsv) {
2078 retval = SvIV(retsv)-1;
22846ab4
AB
2079 if (retval < -1)
2080 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2081 }
22846ab4 2082 return (U32) retval;
93965878
NIS
2083}
2084
cea2e8a9
GS
2085int
2086Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2087{
7918f24d
NC
2088 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2089
36925d9e 2090 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2091 return 0;
2092}
2093
2094int
864dbfa3 2095Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2096{
efaf3674 2097 SV* ret;
463ee0b2 2098
7918f24d
NC
2099 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2100
36925d9e
RZ
2101 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2102 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2103 if (ret)
2104 sv_setsv(key,ret);
79072805
LW
2105 return 0;
2106}
2107
2108int
1146e912 2109Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2110{
7918f24d
NC
2111 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2112
36925d9e 2113 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2114}
a0d0e21e 2115
a3bcc51e
TP
2116SV *
2117Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2118{
5fcbf73d 2119 SV *retval;
ad64d0ec
NC
2120 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2121 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2122
7918f24d
NC
2123 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2124
a3bcc51e
TP
2125 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2126 SV *key;
bfcb3514 2127 if (HvEITER_get(hv))
a3bcc51e
TP
2128 /* we are in an iteration so the hash cannot be empty */
2129 return &PL_sv_yes;
2130 /* no xhv_eiter so now use FIRSTKEY */
2131 key = sv_newmortal();
ad64d0ec 2132 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2133 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2134 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2135 }
2136
2137 /* there is a SCALAR method that we can call */
36925d9e 2138 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2139 if (!retval)
5fcbf73d 2140 retval = &PL_sv_undef;
a3bcc51e
TP
2141 return retval;
2142}
2143
a0d0e21e 2144int
864dbfa3 2145Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2146{
089b5c60 2147 SV **svp;
7918f24d
NC
2148
2149 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2150
089b5c60
NC
2151 /* The magic ptr/len for the debugger's hash should always be an SV. */
2152 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2153 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2154 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2155 }
2156
2157 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2158 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2159 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2160 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2161
8772537c 2162 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2163 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2164 if (o) {
2165#ifdef PERL_DEBUG_READONLY_OPS
2166 Slab_to_rw(OpSLAB(o));
2167#endif
2168 /* set or clear breakpoint in the relevant control op */
089b5c60 2169 if (SvTRUE(sv))
88df5f01 2170 o->op_flags |= OPf_SPECIAL;
8772537c 2171 else
88df5f01
FC
2172 o->op_flags &= ~OPf_SPECIAL;
2173#ifdef PERL_DEBUG_READONLY_OPS
2174 Slab_to_ro(OpSLAB(o));
2175#endif
8772537c 2176 }
5df8de69 2177 }
79072805
LW
2178 return 0;
2179}
2180
2181int
8772537c 2182Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2183{
502c6561 2184 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2185
2186 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2187
83bf042f 2188 if (obj) {
e1dccc0d 2189 sv_setiv(sv, AvFILL(obj));
83bf042f 2190 } else {
3773545d 2191 sv_set_undef(sv);
83bf042f 2192 }
79072805
LW
2193 return 0;
2194}
2195
2196int
864dbfa3 2197Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2198{
502c6561 2199 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2200
2201 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2202
83bf042f 2203 if (obj) {
e1dccc0d 2204 av_fill(obj, SvIV(sv));
83bf042f 2205 } else {
a2a5de95
NC
2206 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2207 "Attempt to set length of freed array");
83bf042f
NC
2208 }
2209 return 0;
2210}
2211
2212int
83f29afa
VP
2213Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2214{
83f29afa
VP
2215 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2216 PERL_UNUSED_ARG(sv);
dc3bf405 2217 PERL_UNUSED_CONTEXT;
83f29afa
VP
2218
2219 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2220 if (sizeof(IV) == sizeof(SSize_t)) {
2221 *((IV *) &(mg->mg_len)) = 0;
2222 } else {
2223 if (mg->mg_ptr)
2224 *((IV *) mg->mg_ptr) = 0;
2225 }
83f29afa
VP
2226
2227 return 0;
2228}
2229
2230int
83bf042f
NC
2231Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2232{
7918f24d 2233 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2234 PERL_UNUSED_ARG(sv);
7918f24d 2235
94f3782b
DM
2236 /* during global destruction, mg_obj may already have been freed */
2237 if (PL_in_clean_all)
1ea47f64 2238 return 0;
94f3782b 2239
83bf042f
NC
2240 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2241
2242 if (mg) {
2243 /* arylen scalar holds a pointer back to the array, but doesn't own a
2244 reference. Hence the we (the array) are about to go away with it
2245 still pointing at us. Clear its pointer, else it would be pointing
2246 at free memory. See the comment in sv_magic about reference loops,
2247 and why it can't own a reference to us. */
2248 mg->mg_obj = 0;
2249 }
a0d0e21e
LW
2250 return 0;
2251}
2252
2253int
864dbfa3 2254Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2255{
16eb5365 2256 SV* const lsv = LvTARG(sv);
96c2a8ff 2257 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2258
2259 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2260 PERL_UNUSED_ARG(mg);
ac27b0f5 2261
6174b39a
FC
2262 if (found && found->mg_len != -1) {
2263 STRLEN i = found->mg_len;
25fdce4a 2264 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2265 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2266 sv_setuv(sv, i);
a0d0e21e 2267 return 0;
a0d0e21e 2268 }
3773545d 2269 sv_set_undef(sv);
a0d0e21e
LW
2270 return 0;
2271}
2272
2273int
864dbfa3 2274Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2275{
16eb5365 2276 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2277 SSize_t pos;
2278 STRLEN len;
53d44271 2279 MAGIC* found;
aec43834 2280 const char *s;
a0d0e21e 2281
7918f24d 2282 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2283 PERL_UNUSED_ARG(mg);
ac27b0f5 2284
96c2a8ff 2285 found = mg_find_mglob(lsv);
3881461a 2286 if (!found) {
a0d0e21e
LW
2287 if (!SvOK(sv))
2288 return 0;
96c2a8ff 2289 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2290 }
2291 else if (!SvOK(sv)) {
3881461a 2292 found->mg_len = -1;
a0d0e21e
LW
2293 return 0;
2294 }
aec43834 2295 s = SvPV_const(lsv, len);
a0d0e21e 2296
e1dccc0d 2297 pos = SvIV(sv);
a0ed51b3 2298
7e2040f0 2299 if (DO_UTF8(lsv)) {
19742f39 2300 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2301 if (ulen)
2302 len = ulen;
a0ed51b3
LW
2303 }
2304
a0d0e21e
LW
2305 if (pos < 0) {
2306 pos += len;
2307 if (pos < 0)
2308 pos = 0;
2309 }
eb160463 2310 else if (pos > (SSize_t)len)
a0d0e21e 2311 pos = len;
a0ed51b3 2312
3881461a 2313 found->mg_len = pos;
25fdce4a 2314 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2315
79072805
LW
2316 return 0;
2317}
2318
2319int
864dbfa3 2320Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2321{
2322 STRLEN len;
35a4481c 2323 SV * const lsv = LvTARG(sv);
b83604b4 2324 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2325 STRLEN offs = LvTARGOFF(sv);
2326 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2327 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2328 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2329
2330 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2331 PERL_UNUSED_ARG(mg);
6ff81951 2332
83f78d1a 2333 if (!translate_substr_offsets(
4ddea69a 2334 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2335 negoff ? -(IV)offs : (IV)offs, !negoff,
2336 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2337 )) {
2338 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2339 sv_set_undef(sv);
83f78d1a
FC
2340 return 0;
2341 }
2342
9aa983d2 2343 if (SvUTF8(lsv))
4ddea69a 2344 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2345 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2346 if (SvUTF8(lsv))
2ef4b674 2347 SvUTF8_on(sv);
6ff81951
GS
2348 return 0;
2349}
2350
2351int
864dbfa3 2352Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2353{
83f78d1a 2354 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2355 const char * const tmps = SvPV_const(sv, len);
dd374669 2356 SV * const lsv = LvTARG(sv);
777f7c56
EB
2357 STRLEN lvoff = LvTARGOFF(sv);
2358 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2359 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2360 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2361
2362 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2363 PERL_UNUSED_ARG(mg);
075a4a2b 2364
a74fb2cd
FC
2365 SvGETMAGIC(lsv);
2366 if (SvROK(lsv))
2367 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2368 "Attempt to use reference as lvalue in substr"
2369 );
fc061ed8
FC
2370 SvPV_force_nomg(lsv,lsv_len);
2371 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2372 if (!translate_substr_offsets(
2373 lsv_len,
2374 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2375 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2376 ))
2377 Perl_croak(aTHX_ "substr outside of string");
2378 oldtarglen = lvlen;
1aa99e6b 2379 if (DO_UTF8(sv)) {
73a087f0 2380 sv_utf8_upgrade_nomg(lsv);
d931b1be 2381 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2382 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2383 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2384 SvUTF8_on(lsv);
2385 }
0d336106 2386 else if (SvUTF8(lsv)) {
5fcbf73d 2387 const char *utf8;
d931b1be 2388 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2389 newtarglen = len;
5fcbf73d 2390 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2391 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2392 Safefree(utf8);
1aa99e6b 2393 }
b76f3ce2 2394 else {
a74fb2cd 2395 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2396 newtarglen = len;
b76f3ce2 2397 }
83f78d1a
FC
2398 if (!neglen) LvTARGLEN(sv) = newtarglen;
2399 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2400
79072805
LW
2401 return 0;
2402}
2403
2404int
864dbfa3 2405Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2406{
7918f24d 2407 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2408 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2409#ifdef NO_TAINT_SUPPORT
2410 PERL_UNUSED_ARG(mg);
2411#endif
7918f24d 2412
64ff300b 2413 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2414 return 0;
2415}
2416
2417int
864dbfa3 2418Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2419{
7918f24d 2420 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2421 PERL_UNUSED_ARG(sv);
7918f24d 2422
b01e650a 2423 /* update taint status */
284167a5 2424 if (TAINT_get)
b01e650a
DM
2425 mg->mg_len |= 1;
2426 else
2427 mg->mg_len &= ~1;
463ee0b2
LW
2428 return 0;
2429}
2430
2431int
864dbfa3 2432Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2433{
35a4481c 2434 SV * const lsv = LvTARG(sv);
1b92e694 2435 char errflags = LvFLAGS(sv);
7918f24d
NC
2436
2437 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2438 PERL_UNUSED_ARG(mg);
6ff81951 2439
1b92e694 2440 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2441 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2442 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2443
6ff81951
GS
2444 return 0;
2445}
2446
2447int
864dbfa3 2448Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2449{
7918f24d 2450 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2451 PERL_UNUSED_ARG(mg);
79072805
LW
2452 do_vecset(sv); /* XXX slurp this routine */
2453 return 0;
2454}
2455
13733cde
FC
2456SV *
2457Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2458{
a0714e2c 2459 SV *targ = NULL;
13733cde
FC
2460 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2461 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2462 assert(mg);
5f05dabc 2463 if (LvTARGLEN(sv)) {
68dc0745 2464 if (mg->mg_obj) {
8772537c 2465 SV * const ahv = LvTARG(sv);
85fbaab2 2466 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2467 if (he)
2468 targ = HeVAL(he);
68dc0745 2469 }
bbfdc870 2470 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2471 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2472 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2473 {
2474 if (SvRMAGICAL(av)) {
2475 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2476 targ = svp ? *svp : NULL;
2477 }
2478 else
bbfdc870 2479 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2480 }
68dc0745 2481 }
46da273f 2482 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2483 /* somebody else defined it for us */
2484 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2485 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2486 LvTARGLEN(sv) = 0;
2487 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2488 mg->mg_obj = NULL;
68dc0745
PP
2489 mg->mg_flags &= ~MGf_REFCOUNTED;
2490 }
13733cde 2491 return targ;
5f05dabc 2492 }
71be2cbc 2493 else
13733cde
FC
2494 return LvTARG(sv);
2495}
2496
2497int
2498Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2499{
2500 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2501
2502 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2503 return 0;
2504}
2505
2506int
864dbfa3 2507Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2508{
7918f24d 2509 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2510 PERL_UNUSED_ARG(mg);
71be2cbc 2511 if (LvTARGLEN(sv))
68dc0745
PP
2512 vivify_defelem(sv);
2513 if (LvTARG(sv)) {
5f05dabc 2514 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2515 SvSETMAGIC(LvTARG(sv));
2516 }
5f05dabc
PP
2517 return 0;
2518}
2519
71be2cbc 2520void
864dbfa3 2521Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2522{
74e13ce4 2523 MAGIC *mg;
a0714e2c 2524 SV *value = NULL;
71be2cbc 2525
7918f24d
NC
2526 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2527
14befaf4 2528 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2529 return;
68dc0745 2530 if (mg->mg_obj) {
8772537c 2531 SV * const ahv = LvTARG(sv);
85fbaab2 2532 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2533 if (he)
2534 value = HeVAL(he);
3280af22 2535 if (!value || value == &PL_sv_undef)
be2597df 2536 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2537 }
bbfdc870
FC
2538 else if (LvSTARGOFF(sv) < 0)
2539 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2540 else {
502c6561 2541 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2542 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2543 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2544 else {
bbfdc870 2545 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2546 if (!svp || !(value = *svp))
bbfdc870 2547 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2548 }
2549 }
b37c2d43 2550 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2551 SvREFCNT_dec(LvTARG(sv));
2552 LvTARG(sv) = value;
71be2cbc 2553 LvTARGLEN(sv) = 0;
68dc0745 2554 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2555 mg->mg_obj = NULL;
68dc0745 2556 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2557}
2558
2559int
1f1dcfb5
FC
2560Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2561{
2562 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2563 PERL_UNUSED_ARG(mg);
2564 sv_unmagic(sv, PERL_MAGIC_nonelem);
2565 return 0;
2566}
2567
2568int
864dbfa3 2569Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2570{
7918f24d 2571 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2572 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2573 return 0;
810b8aa5
GS
2574}
2575
2576int
864dbfa3 2577Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2578{
7918f24d 2579 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2580 PERL_UNUSED_CONTEXT;
0177730e 2581 PERL_UNUSED_ARG(sv);
565764a8 2582 mg->mg_len = -1;
93a17b20
LW
2583 return 0;
2584}
2585
2586int
864dbfa3 2587Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2588{
35a4481c 2589 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2590
7918f24d
NC
2591 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2592
79072805 2593 if (uf && uf->uf_set)
24f81a43 2594 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2595 return 0;
2596}
2597
c277df42 2598int
faf82a0b
AE
2599Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2600{
488344d2 2601 const char type = mg->mg_type;
7918f24d
NC
2602
2603 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2604
a5c7cb08
DM
2605 assert( type == PERL_MAGIC_fm
2606 || type == PERL_MAGIC_qr
2607 || type == PERL_MAGIC_bm);
488344d2 2608 return sv_unmagic(sv, type);
faf82a0b
AE
2609}
2610
7a4c00b4 2611#ifdef USE_LOCALE_COLLATE
79072805 2612int
864dbfa3 2613Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2614{
7918f24d
NC
2615 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2616
bbce6d69 2617 /*
838b5b74 2618 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2619 * and vanished with a faint plop.
2620 */
96a5add6 2621 PERL_UNUSED_CONTEXT;
8772537c 2622 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2623 if (mg->mg_ptr) {
2624 Safefree(mg->mg_ptr);
2625 mg->mg_ptr = NULL;
565764a8 2626 mg->mg_len = -1;
7a4c00b4 2627 }
bbce6d69
PP
2628 return 0;
2629}
7a4c00b4 2630#endif /* USE_LOCALE_COLLATE */
bbce6d69 2631
7e8c5dac
HS
2632/* Just clear the UTF-8 cache data. */
2633int
2634Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2635{
7918f24d 2636 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2637 PERL_UNUSED_CONTEXT;
8772537c 2638 PERL_UNUSED_ARG(sv);
7e8c5dac 2639 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2640 mg->mg_ptr = NULL;
7e8c5dac
HS
2641 mg->mg_len = -1; /* The mg_len holds the len cache. */
2642 return 0;
2643}
2644
bbce6d69 2645int
9cce4f9a
FC
2646Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2647{
9782ce69 2648 const char *bad = NULL;
9cce4f9a 2649 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2650 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2651 switch (mg->mg_private & OPpLVREF_TYPE) {
2652 case OPpLVREF_SV:
2653 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2654 bad = " SCALAR";
2655 break;
2656 case OPpLVREF_AV:
2657 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2658 bad = "n ARRAY";
2659 break;
2660 case OPpLVREF_HV:
2661 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2662 bad = " HASH";
2663 break;
2664 case OPpLVREF_CV:
2665 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2666 bad = " CODE";
2667 }
2668 if (bad)
26a50d99 2669 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2670 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2671 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2672 case 0:
2673 {
2674 SV * const old = PAD_SV(mg->mg_len);
2675 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2676 SvREFCNT_dec(old);
2677 break;
2678 }
2679 case SVt_PVGV:
2680 gv_setref(mg->mg_obj, sv);
2681 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2682 break;
2683 case SVt_PVAV:
2684 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2685 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2686 break;
2687 case SVt_PVHV:
7fcb36d5
JH
2688 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2689 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2690 }
d39c26a6
FC
2691 if (mg->mg_flags & MGf_PERSIST)
2692 NOOP; /* This sv is in use as an iterator var and will be reused,
2693 so we must leave the magic. */
2694 else
2695 /* This sv could be returned by the assignment op, so clear the
2696 magic, as lvrefs are an implementation detail that must not be
2697 leaked to the user. */
2698 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2699 return 0;
2700}
2701
f1540bed
JH
2702static void
2703S_set_dollarzero(pTHX_ SV *sv)
2704 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2705{
2706#ifdef USE_ITHREADS
2707 dVAR;
2708#endif
2709 const char *s;
2710 STRLEN len;
f1540bed
JH
2711#ifdef HAS_SETPROCTITLE
2712 /* The BSDs don't show the argv[] in ps(1) output, they
2713 * show a string from the process struct and provide
2714 * the setproctitle() routine to manipulate that. */
2715 if (PL_origalen != 1) {
2716 s = SvPV_const(sv, len);
38626956 2717# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2718 /* The leading "-" removes the "perl: " prefix,
2719 * but not the "(perl) suffix from the ps(1)
2720 * output, because that's what ps(1) shows if the
2721 * argv[] is modified. */
2722 setproctitle("-%s", s);
2723# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2724 /* This doesn't really work if you assume that
2725 * $0 = 'foobar'; will wipe out 'perl' from the $0
2726 * because in ps(1) output the result will be like
2727 * sprintf("perl: %s (perl)", s)
2728 * I guess this is a security feature:
2729 * one (a user process) cannot get rid of the original name.
2730 * --jhi */
2731 setproctitle("%s", s);
2732# endif
2733 }
2734#elif defined(__hpux) && defined(PSTAT_SETCMD)
2735 if (PL_origalen != 1) {
2736 union pstun un;
2737 s = SvPV_const(sv, len);
2738 un.pst_command = (char *)s;
2739 pstat(PSTAT_SETCMD, un, len, 0, 0);
2740 }
2741#else
2742 if (PL_origalen > 1) {
4f3e04fd 2743 I32 i;
f1540bed
JH
2744 /* PL_origalen is set in perl_parse(). */
2745 s = SvPV_force(sv,len);
2746 if (len >= (STRLEN)PL_origalen-1) {
2747 /* Longer than original, will be truncated. We assume that
2748 * PL_origalen bytes are available. */
2749 Copy(s, PL_origargv[0], PL_origalen-1, char);
2750 }
2751 else {
2752 /* Shorter than original, will be padded. */
2753#ifdef PERL_DARWIN
2754 /* Special case for Mac OS X: see [perl #38868] */
2755 const int pad = 0;
2756#else
2757 /* Is the space counterintuitive? Yes.
2758 * (You were expecting \0?)
2759 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2760 * --jhi */
2761 const int pad = ' ';
2762#endif
2763 Copy(s, PL_origargv[0], len, char);
2764 PL_origargv[0][len] = 0;
2765 memset(PL_origargv[0] + len + 1,
2766 pad, PL_origalen - len - 1);
2767 }
2768 PL_origargv[0][PL_origalen-1] = 0;
2769 for (i = 1; i < PL_origargc; i++)
2770 PL_origargv[i] = 0;
2771#ifdef HAS_PRCTL_SET_NAME
2772 /* Set the legacy process name in addition to the POSIX name on Linux */
2773 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2774 /* diag_listed_as: SKIPME */
2775 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2776 }
2777#endif
2778 }
2779#endif
2780}
2781
9cce4f9a 2782int
864dbfa3 2783Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2784{
20b7effb 2785#ifdef USE_ITHREADS
97aff369 2786 dVAR;
20b7effb 2787#endif
eb578fdb
KW
2788 I32 paren;
2789 const REGEXP * rx;
79072805 2790 I32 i;
8990e307 2791 STRLEN len;
125b9982 2792 MAGIC *tmg;
2fdbfb4d 2793
7918f24d
NC
2794 PERL_ARGS_ASSERT_MAGIC_SET;
2795
e91d8259 2796 if (!mg->mg_ptr) {
960b831f 2797 paren = mg->mg_len;
1e05feb3 2798 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2799 setparen_got_rx:
2fdbfb4d 2800 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2801 } else {
2fdbfb4d
AB
2802 /* Croak with a READONLY error when a numbered match var is
2803 * set without a previous pattern match. Unless it's C<local $1>
2804 */
e91d8259 2805 croakparen:
2fdbfb4d 2806 if (!PL_localizing) {
cb077ed2 2807 Perl_croak_no_modify();
2fdbfb4d
AB
2808 }
2809 }
e91d8259
NC
2810 return 0;
2811 }
2812
2813 switch (*mg->mg_ptr) {
748a9306 2814 case '\001': /* ^A */
f2da823f
FC
2815 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2816 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2817 FmLINES(PL_bodytarget) = 0;
2818 if (SvPOK(PL_bodytarget)) {
2819 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2820 char *e = SvEND(PL_bodytarget);
2821 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2822 FmLINES(PL_bodytarget)++;
2823 s++;
2824 }
2825 }
125b9982 2826 /* mg_set() has temporarily made sv non-magical */
284167a5 2827 if (TAINTING_get) {
125b9982
NT
2828 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2829 SvTAINTED_on(PL_bodytarget);
2830 else
2831 SvTAINTED_off(PL_bodytarget);
2832 }
748a9306 2833 break;
49460fe6 2834 case '\003': /* ^C */
f2338a2e 2835 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2836 break;
2837
79072805 2838 case '\004': /* ^D */
b4ab917c 2839#ifdef DEBUGGING
a9e2d2bf
DM
2840 {
2841 const char *s = SvPV_nolen_const(sv);
2842 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2843 if (DEBUG_x_TEST || DEBUG_B_TEST)
2844 dump_all_perl(!DEBUG_B_TEST);
2845 }
b4ab917c 2846#else
38ab35f8 2847 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2848#endif
79072805 2849 break;
28f23441 2850 case '\005': /* ^E */
d0063567 2851 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2852#ifdef VMS
38ab35f8 2853 set_vaxc_errno(SvIV(sv));
2abc681d 2854#elif defined(WIN32)
d0063567 2855 SetLastError( SvIV(sv) );
2abc681d 2856#elif defined(OS2)
38ab35f8 2857 os2_setsyserrno(SvIV(sv));
2abc681d 2858#else
d0063567 2859 /* will anyone ever use this? */
38ab35f8 2860 SETERRNO(SvIV(sv), 4);
22fae026 2861#endif
d0063567 2862 }
fd503f5c
DIM
2863 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2864 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2865 break;
79072805 2866 case '\006': /* ^F */
9f601cf3
TC
2867 if (mg->mg_ptr[1] == '\0') {
2868 PL_maxsysfd = SvIV(sv);
2869 }
2870 else if (strEQ(mg->mg_ptr + 1, "EATURE_BITS")) {
2871 PL_compiling.cop_features = SvUV(sv);
2872 }
79072805 2873 break;
a0d0e21e 2874 case '\010': /* ^H */
efa571ab
KW
2875 {
2876 U32 save_hints = PL_hints;
5d382c25 2877 PL_hints = SvUV(sv);
efa571ab
KW
2878
2879 /* If wasn't UTF-8, and now is, notify the parser */
2880 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2881 notify_parser_that_changed_to_utf8();
2882 }
2883 }
a0d0e21e 2884 break;
9d116dd7 2885 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2886 Safefree(PL_inplace);
bd61b366 2887 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2888 break;
d9bad346
FC
2889 case '\016': /* ^N */
2890 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2891 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2892 goto croakparen;
28f23441 2893 case '\017': /* ^O */
ac27b0f5 2894 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2895 Safefree(PL_osname);
bd61b366 2896 PL_osname = NULL;
3511154c
DM
2897 if (SvOK(sv)) {
2898 TAINT_PROPER("assigning to $^O");
2e0de35c 2899 PL_osname = savesvpv(sv);
3511154c 2900 }
ac27b0f5
NIS
2901 }
2902 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2903 STRLEN len;
2904 const char *const start = SvPV(sv, len);
b54fc2b6 2905 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2906 SV *tmp;
8b850bd5
NC
2907
2908
2909 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2910 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2911
2912 /* Opening for input is more common than opening for output, so
2913 ensure that hints for input are sooner on linked list. */
59cd0e26 2914 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2915 SvUTF8(sv))
2916 : newSVpvs_flags("", SvUTF8(sv));
2917 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2918 mg_set(tmp);
8b850bd5 2919
f747ebd6
Z
2920 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2921 SvUTF8(sv));
2922 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2923 mg_set(tmp);
ac27b0f5 2924 }
28f23441 2925 break;
79072805 2926 case '\020': /* ^P */
2fdbfb4d
AB
2927 PL_perldb = SvIV(sv);
2928 if (PL_perldb && !PL_DBsingle)
2929 init_debugger();
9b9e0be4 2930 break;
79072805 2931 case '\024': /* ^T */
88e89b8a 2932#ifdef BIG_TIME
6b88bc9c 2933 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2934#else
38ab35f8 2935 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2936#endif
79072805 2937 break;
e07ea26a
NC
2938 case '\025': /* ^UTF8CACHE */
2939 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2940 PL_utf8cache = (signed char) sv_2iv(sv);
2941 }
2942 break;
fde18df1 2943 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2944 if (*(mg->mg_ptr+1) == '\0') {
2945 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2946 i = SvIV(sv);
ac27b0f5 2947 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2948 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2949 }
599cee73 2950 }
0a378802 2951 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2952 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450 2953 if (!SvPOK(sv)) {
1113f30d
DM
2954 if (!specialWARN(PL_compiling.cop_warnings))
2955 PerlMemShared_free(PL_compiling.cop_warnings);
7e4f0450 2956 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2957 break;
2958 }
f4fc7782 2959 {
b5477537 2960 STRLEN len, i;
006c1a1d
Z
2961 int not_none = 0, not_all = 0;
2962 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2963 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2964 not_none |= ptr[i];
2965 not_all |= ptr[i] ^ 0x55;
f4fc7782 2966 }
006c1a1d 2967 if (!not_none) {
4243c432
NC
2968 if (!specialWARN(PL_compiling.cop_warnings))
2969 PerlMemShared_free(PL_compiling.cop_warnings);
2970 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2971 } else if (len >= WARNsize && !not_all) {
2972 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2973 PerlMemShared_free(PL_compiling.cop_warnings);
2974 PL_compiling.cop_warnings = pWARN_ALL;
2975 PL_dowarn |= G_WARN_ONCE ;
2976 }
d3a7d8c7 2977 else {
72dc9ed5
NC
2978 STRLEN len;
2979 const char *const p = SvPV_const(sv, len);
2980
2981 PL_compiling.cop_warnings
8ee4cf24 2982 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2983 p, len);
2984
d3a7d8c7
GS
2985 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2986 PL_dowarn |= G_WARN_ONCE ;
2987 }
f4fc7782 2988
d3a7d8c7 2989 }
4438c4b7 2990 }
971a9dd3 2991 }
8ca2a5d6
DD
2992#ifdef WIN32
2993 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2994 w32_sloppystat = (bool)sv_true(sv);
2995 }
2996#endif
79072805
LW
2997 break;
2998 case '.':
3280af22
NIS
2999 if (PL_localizing) {
3000 if (PL_localizing == 1)
7766f137 3001 SAVESPTR(PL_last_in_gv);
748a9306 3002 }
3280af22 3003 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 3004 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
3005 break;
3006 case '^':
acbe1b9d 3007 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 3008 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 3009 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
3010 break;
3011 case '~':
acbe1b9d 3012 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 3013 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 3014 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
3015 break;
3016 case '=':
acbe1b9d 3017 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
3018 break;
3019 case '-':
acbe1b9d
FC
3020 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3021 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 3022 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
3023 break;
3024 case '%':
acbe1b9d 3025 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
3026 break;
3027 case '|':
4b65379b 3028 {
099be4f1 3029 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
3030 if(!io)
3031 break;
38ab35f8 3032 if ((SvIV(sv)) == 0)
4b65379b
CS
3033 IoFLAGS(io) &= ~IOf_FLUSH;
3034 else {
3035 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3036 PerlIO *ofp = IoOFP(io);
3037 if (ofp)
3038 (void)PerlIO_flush(ofp);
3039 IoFLAGS(io) |= IOf_FLUSH;
3040 }
3041 }
79072805
LW
3042 }
3043 break;
79072805 3044 case '/':
1ab48e3a 3045 {
1ab48e3a 3046 if (SvROK(sv)) {
8d37cdf7
DIM
3047 SV *referent = SvRV(sv);
3048 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3049 /* XXX: dodgy type check: This leaves me feeling dirty, but
3050 * the alternative is to copy pretty much the entire
3051 * sv_reftype() into this routine, or to do a full string
3052 * comparison on the return of sv_reftype() both of which
3053 * make me feel worse! NOTE, do not modify this comment
3054 * without reviewing the corresponding comment in
3055 * sv_reftype(). - Yves */
1ab48e3a 3056 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3057 IV val = SvIV(referent);
1ab48e3a 3058 if (val <= 0) {
520b6fb6
DIM
3059 sv_setsv(sv, PL_rs);
3060 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3061 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3062 }
3063 } else {
ddce084a 3064 sv_setsv(sv, PL_rs);
8d37cdf7 3065 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3066 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3067 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3068 }
3069 }
b3a2acfa 3070 SvREFCNT_dec(PL_rs);
520b6fb6 3071 PL_rs = newSVsv(sv);
b3a2acfa 3072 }
79072805
LW
3073 break;
3074 case '\\':
ef8d46e8 3075 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3076 if (SvOK(sv)) {
7889fe52 3077 PL_ors_sv = newSVsv(sv);
009c130f 3078 }
e3c19b7b 3079 else {
a0714e2c 3080 PL_ors_sv = NULL;
e3c19b7b 3081 }
79072805 3082 break;
7d69d4a6
FC
3083 case '[':
3084 if (SvIV(sv) != 0)
3085 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3086 break;
79072805 3087 case '?':
ff0cee69 3088#ifdef COMPLEX_STATUS
6b88bc9c 3089 if (PL_localizing == 2) {
41cb7b2b 3090 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3091 PL_statusvalue = LvTARGOFF(sv);
3092 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3093 }
3094 else
3095#endif
3096#ifdef VMSISH_STATUS
3097 if (VMSISH_STATUS)
fb38d079 3098 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3099 else
3100#endif
38ab35f8 3101 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3102 break;
3103 case '!':
93189314
JH
3104 {
3105#ifdef VMS
3106# define PERL_VMS_BANG vaxc$errno
3107#else
3108# define PERL_VMS_BANG 0
3109#endif
79c32fc2 3110#if defined(WIN32)
c9beaf97
SH
3111 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3112 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3113#else
91487cfc 3114 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3115 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3116#endif
93189314 3117 }
79072805
LW
3118 break;
3119 case '<':
985213f2 3120 {
b469f1e0 3121 /* XXX $< currently silently ignores failures */
dfff4baf 3122 const Uid_t new_uid = SvUID(sv);
985213f2 3123 PL_delaymagic_uid = new_uid;
3280af22
NIS
3124 if (PL_delaymagic) {
3125 PL_delaymagic |= DM_RUID;
79072805
LW
3126 break; /* don't do magic till later */
3127 }
3128#ifdef HAS_SETRUID
b469f1e0 3129 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3130#elif defined(HAS_SETREUID)
b469f1e0 3131 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3132#elif defined(HAS_SETRESUID)
b469f1e0 3133 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3134#else
985213f2 3135 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3136# ifdef PERL_DARWIN
75870ed3 3137 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3138 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3139 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3140# endif
b469f1e0 3141 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3142 } else {
cea2e8a9 3143 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3144 }
79072805 3145#endif
79072805 3146 break;
985213f2 3147 }
79072805 3148 case '>':
985213f2 3149 {
b469f1e0 3150 /* XXX $> currently silently ignores failures */
dfff4baf 3151 const Uid_t new_euid = SvUID(sv);
985213f2 3152 PL_delaymagic_euid = new_euid;
3280af22
NIS
3153 if (PL_delaymagic) {
3154 PL_delaymagic |= DM_EUID;
79072805
LW
3155 break; /* don't do magic till later */
3156 }
3157#ifdef HAS_SETEUID
b469f1e0 3158 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3159#elif defined(HAS_SETREUID)
b469f1e0 3160 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3161#elif defined(HAS_SETRESUID)
b469f1e0 3162 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3163#else
985213f2 3164 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3165 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3166 else {
cea2e8a9 3167 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3168 }
79072805 3169#endif
79072805 3170 break;
985213f2 3171 }
79072805 3172 case '(':
985213f2 3173 {
b469f1e0 3174 /* XXX $( currently silently ignores failures */
dfff4baf 3175 const Gid_t new_gid = SvGID(sv);
985213f2 3176 PL_delaymagic_gid = new_gid;
3280af22
NIS
3177 if (PL_delaymagic) {
3178 PL_delaymagic |= DM_RGID;
79072805
LW
3179 break; /* don't do magic till later */
3180 }
3181#ifdef HAS_SETRGID
b469f1e0 3182 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3183#elif defined(HAS_SETREGID)
b469f1e0 3184 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3185#elif defined(HAS_SETRESGID)
b469f1e0 3186 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3187#else
985213f2 3188 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3189 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3190 else {
cea2e8a9 3191 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3192 }
79072805 3193#endif
79072805 3194 break;
985213f2 3195 }
79072805 3196 case ')':
985213f2 3197 {
0635704a
HS
3198/* (hv) best guess: maybe we'll need configure probes to do a better job,
3199 * but you can override it if you need to.
3200 */
3201#ifndef INVALID_GID
3202#define INVALID_GID ((Gid_t)-1)
3203#endif
b469f1e0 3204 /* XXX $) currently silently ignores failures */
dfff4baf 3205 Gid_t new_egid;
5cd24f17
PP
3206#ifdef HAS_SETGROUPS
3207 {
b83604b4 3208 const char *p = SvPV_const(sv, len);
757f63d8 3209 Groups_t *gary = NULL;
79e302e6
MM
3210 const char* p_end = p + len;
3211 const char* endptr = p_end;
22ff3130 3212 UV uv;
fb4089e0 3213#ifdef _SC_NGROUPS_MAX
3214 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3215
3216 if (maxgrp < 0)
3217 maxgrp = NGROUPS;
3218#else
3219 int maxgrp = NGROUPS;
3220#endif
757f63d8
SP
3221
3222 while (isSPACE(*p))
3223 ++p;
22ff3130
HS
3224 if (grok_atoUV(p, &uv, &endptr))
3225 new_egid = (Gid_t)uv;
3226 else {
0635704a 3227 new_egid = INVALID_GID;
22ff3130
HS
3228 endptr = NULL;
3229 }
fb4089e0 3230 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3231 if (endptr == NULL)
3232 break;
3233 p = endptr;
79e302e6 3234 endptr = p_end;
757f63d8
SP
3235 while (isSPACE(*p))
3236 ++p;
3237 if (!*p)
3238 break;
fdadaf77 3239 if (!gary)
757f63d8
SP
3240 Newx(gary, i + 1, Groups_t);
3241 else
3242 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3243 if (grok_atoUV(p, &uv, &endptr))
3244 gary[i] = (Groups_t)uv;
3245 else {
0635704a 3246 gary[i] = INVALID_GID;
22ff3130
HS
3247 endptr = NULL;
3248 }
757f63d8
SP
3249 }
3250 if (i)
b469f1e0 3251 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3252 Safefree(gary);
5cd24f17
PP
3253 }
3254#else /* HAS_SETGROUPS */
dfff4baf 3255 new_egid = SvGID(sv);
5cd24f17 3256#endif /* HAS_SETGROUPS */
985213f2 3257 PL_delaymagic_egid = new_egid;
3280af22
NIS
3258 if (PL_delaymagic) {
3259 PL_delaymagic |= DM_EGID;
79072805
LW
3260 break; /* don't do magic till later */
3261 }
3262#ifdef HAS_SETEGID
b469f1e0 3263 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3264#elif defined(HAS_SETREGID)
b469f1e0 3265 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3266#elif defined(HAS_SETRESGID)
b469f1e0 3267 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3268#else
985213f2 3269 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3270 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3271 else {
cea2e8a9 3272 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3273 }
79072805 3274#endif
79072805 3275 break;
985213f2 3276 }
79072805 3277 case ':':
2d8e6c8d 3278 PL_chopset = SvPV_force(sv,len);
79072805 3279 break;
9cdac2a2
FC
3280 case '$': /* $$ */
3281 /* Store the pid in mg->mg_obj so we can tell when a fork has
3282 occurred. mg->mg_obj points to *$ by default, so clear it. */
3283 if (isGV(mg->mg_obj)) {
3284 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3285 SvREFCNT_dec(mg->mg_obj);
3286 mg->mg_flags |= MGf_REFCOUNTED;
3287 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3288 }
3289 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3290 break;
79072805 3291 case '0':
e2975953 3292 LOCK_DOLLARZERO_MUTEX;
f1540bed 3293 S_set_dollarzero(aTHX_ sv);
e2975953 3294 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3295 break;
3296 }
3297 return 0;
3298}
3299
3300I32
84c7b88c
BF
3301Perl_whichsig_sv(pTHX_ SV *sigsv)
3302{
3303 const char *sigpv;
3304 STRLEN siglen;
3305 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3306 sigpv = SvPV_const(sigsv, siglen);
3307 return whichsig_pvn(sigpv, siglen);
3308}
3309
3310I32
3311Perl_whichsig_pv(pTHX_ const char *sig)
3312{
3313 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3314 return whichsig_pvn(sig, strlen(sig));
3315}
3316
3317I32
3318Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3319{
eb578fdb 3320 char* const* sigv;
7918f24d 3321
84c7b88c 3322 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3323 PERL_UNUSED_CONTEXT;
79072805 3324
aadb217d 3325 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3326 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3327 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3328#ifdef SIGCLD
84c7b88c 3329 if (memEQs(sig, len, "CHLD"))
79072805
LW
3330 return SIGCLD;
3331#endif
3332#ifdef SIGCHLD
84c7b88c 3333 if (memEQs(sig, len, "CLD"))
79072805
LW
3334 return SIGCHLD;
3335#endif
7f1236c0 3336 return -1;
79072805
LW
3337}
3338
5e7940ce 3339#ifdef PERL_USE_3ARG_SIGHANDLER
8a5e470b
DM
3340
3341Signal_t
e7124897 3342Perl_sighandler(int sig, Siginfo_t *sip, void *uap)
8a5e470b
DM
3343{
3344 Perl_perly_sighandler(sig, sip, uap, 0);
3345}
3346
1e82f5a6 3347#else
8a5e470b
DM
3348
3349Signal_t
1e82f5a6 3350Perl_sighandler(int sig)
8a5e470b
DM
3351{
3352 Perl_perly_sighandler(sig, NULL, NULL, 0);
3353}
3354
1e82f5a6 3355#endif
8a5e470b
DM
3356
3357/* Invoke the perl-level signal handler. This function is called either
3358 * directly from one of the C-level signals handlers (Perl_sighandler or
3359 * Perl_csighandler), or for safe signals, later from
3360 * Perl_despatch_signals() at a suitable safe point during execution.
3361 *
3362 * 'safe' is a boolean indicating the latter call path.
3363 */
3364
3365Signal_t
3366Perl_perly_sighandler(int sig, Siginfo_t *sip PERL_UNUSED_DECL,
3367 void *uap PERL_UNUSED_DECL, bool safe)
79072805 3368{
1018e26f
NIS
3369#ifdef PERL_GET_SIG_CONTEXT
3370 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3371#else
cea2e8a9 3372 dTHX;
71d280e3 3373#endif
79072805 3374 dSP;
a0714e2c
SS
3375 GV *gv = NULL;
3376 SV *sv = NULL;
8772537c 3377 SV * const tSv = PL_Sv;
601f1833 3378 CV *cv = NULL;
533c011a 3379 OP *myop = PL_op;
84902520 3380 U32 flags = 0;
8772537c 3381 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3382 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3383 SV *errsv_save = NULL;
71d280e3 3384
84902520 3385
727405f8 3386 if (!PL_psig_ptr[sig]) {
99ef548b 3387 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3388 PL_sig_name[sig]);
3389 exit(sig);
3390 }
ff0cee69 3391
a0d63a7b
DM
3392 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3393 /* Max number of items pushed there is 3*n or 4. We cannot fix
3394 infinity, so we fix 4 (in fact 5): */
3395 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3396 flags |= 1;
3397 PL_savestack_ix += 5; /* Protect save in progress. */
3398 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3399 }
84902520 3400 }
84902520 3401 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3402 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3403 || SvTYPE(cv) != SVt_PVCV) {
3404 HV *st;
f2c0649b 3405 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3406 }
84902520 3407
a0d0e21e 3408 if (!cv || !CvROOT(cv)) {
07c325bb 3409 const HEK * const hek = gv
1d6bb9ae
FC
3410 ? GvENAME_HEK(gv)
3411 : cv && CvNAMED(cv)
3412 ? CvNAME_HEK(cv)
07c325bb
FC
3413 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3414 if (hek)
3415 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3416 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3417 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3418 /* diag_listed_as: SIG%s handler "%s" not defined */
3419 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3420 "SIG%s handler \"__ANON__\" not defined.\n",
3421 PL_sig_name[sig]);
00d579c5 3422 goto cleanup;
79072805
LW
3423 }
3424
0c4d3b5e
DM
3425 sv = PL_psig_name[sig]
3426 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3427 : newSVpv(PL_sig_name[sig],0);
72048cfe 3428 flags |= 8;
0c4d3b5e
DM
3429 SAVEFREESV(sv);
3430
a0d63a7b
DM
3431 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3432 /* make sure our assumption about the size of the SAVEs are correct:
3433 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3434 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3435 }
e336de0d 3436
e788e7d3 3437 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3438 PUSHMARK(SP);
79072805 3439 PUSHs(sv);
8aad04aa
JH
3440#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3441 {
3442 struct sigaction oact;
3443
3444 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3445 if (sip) {
3446 HV *sih = newHV();
ad64d0ec 3447 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3448 /* The siginfo fields signo, code, errno, pid, uid,
3449 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3450 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3451 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3452#ifdef HAS_SIGINFO_SI_ERRNO
3453 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3454#endif
3455#ifdef HAS_SIGINFO_SI_STATUS
3456 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3457#endif
3458#ifdef HAS_SIGINFO_SI_UID
3459 {
3460 SV *uid = newSV(0);
3461 sv_setuid(uid, sip->si_uid);
3462 (void)hv_stores(sih, "uid", uid);
3463 }
3464#endif
3465#ifdef HAS_SIGINFO_SI_PID
3466 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3467#endif
3468#ifdef HAS_SIGINFO_SI_ADDR
3469 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3470#endif
3471#ifdef HAS_SIGINFO_SI_BAND
3472