This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
add PERL_USE_3ARG_SIGHANDLER macro
[perl5.git] / mg.c
CommitLineData
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. */
5e7940ce 1536#ifdef PERL_USE_3ARG_SIGHANDLER
80626cf1 1537 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1538#else
1539 (*PL_sighandlerp)(sig);
92807b6d 1540#endif
406878dd 1541 else {
31c91b43 1542 if (!PL_psig_pend) return;
406878dd
GA
1543 /* Set a flag to say this signal is pending, that is awaiting delivery after
1544 * the current Perl opcode completes */
1545 PL_psig_pend[sig]++;
1546
1547#ifndef SIG_PENDING_DIE_COUNT
1548# define SIG_PENDING_DIE_COUNT 120
1549#endif
fe13d51d 1550 /* Add one to say _a_ signal is pending */
406878dd
GA
1551 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1552 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1553 (unsigned long)SIG_PENDING_DIE_COUNT);
1554 }
0a8e0eff
NIS
1555}
1556
2e34cc90
CL
1557#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1558void
1559Perl_csighandler_init(void)
1560{
1561 int sig;
27da23d5 1562 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1563
1564 for (sig = 1; sig < SIG_SIZE; sig++) {
1565#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1566 dTHX;
27da23d5 1567 PL_sig_defaulting[sig] = 1;
5c1546dc 1568 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1569#endif
1570#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1571 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1572#endif
1573 }
27da23d5 1574 PL_sig_handlers_initted = 1;
2e34cc90
CL
1575}
1576#endif
1577
7fe50b8b
LT
1578#if defined HAS_SIGPROCMASK
1579static void
1580unblock_sigmask(pTHX_ void* newset)
1581{
dc3bf405 1582 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1583 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1584}
1585#endif
1586
0a8e0eff
NIS
1587void
1588Perl_despatch_signals(pTHX)
1589{
1590 int sig;
1591 PL_sig_pending = 0;
1592 for (sig = 1; sig < SIG_SIZE; sig++) {
1593 if (PL_psig_pend[sig]) {
d0166017 1594 dSAVE_ERRNO;
7fe50b8b 1595#ifdef HAS_SIGPROCMASK
55534442
LT
1596 /* From sigaction(2) (FreeBSD man page):
1597 * | Signal routines normally execute with the signal that
1598 * | caused their invocation blocked, but other signals may
1599 * | yet occur.
1600 * Emulation of this behavior (from within Perl) is enabled
1601 * using sigprocmask
1602 */
1603 int was_blocked;
1604 sigset_t newset, oldset;
1605
1606 sigemptyset(&newset);
1607 sigaddset(&newset, sig);
1608 sigprocmask(SIG_BLOCK, &newset, &oldset);
1609 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1610 if (!was_blocked) {
1611 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1612 ENTER;
1613 SAVEFREESV(save_sv);
1614 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1615 }
55534442 1616#endif
25da4428 1617 PL_psig_pend[sig] = 0;
5e7940ce 1618#ifdef PERL_USE_3ARG_SIGHANDLER
80626cf1 1619 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1620#else
1621 (*PL_sighandlerp)(sig);
92807b6d 1622#endif
7fe50b8b 1623#ifdef HAS_SIGPROCMASK
55534442 1624 if (!was_blocked)
7fe50b8b 1625 LEAVE;
55534442 1626#endif
d0166017 1627 RESTORE_ERRNO;
0a8e0eff
NIS
1628 }
1629 }
1630}
1631
38a124f0 1632/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1633int
864dbfa3 1634Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1635{
27da23d5 1636 dVAR;
79072805 1637 I32 i;
cbbf8932 1638 SV** svp = NULL;
2d4fcd5e
AJ
1639 /* Need to be careful with SvREFCNT_dec(), because that can have side
1640 * effects (due to closures). We must make sure that the new disposition
1641 * is in place before it is called.
1642 */
cbbf8932 1643 SV* to_dec = NULL;
e72dc28c 1644 STRLEN len;
2d4fcd5e
AJ
1645#ifdef HAS_SIGPROCMASK
1646 sigset_t set, save;
1647 SV* save_sv;
1648#endif
eb578fdb 1649 const char *s = MgPV_const(mg,len);
7918f24d
NC
1650
1651 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1652
748a9306 1653 if (*s == '_') {
84c7b88c 1654 if (memEQs(s, len, "__DIE__"))
3280af22 1655 svp = &PL_diehook;
84c7b88c 1656 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1657 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1658 /* Merge the existing behaviours, which are as follows:
1659 magic_setsig, we always set svp to &PL_warnhook
1660 (hence we always change the warnings handler)
1661 For magic_clearsig, we don't change the warnings handler if it's
1662 set to the &PL_warnhook. */
3280af22 1663 svp = &PL_warnhook;
84c7b88c
BF
1664 } else if (sv) {
1665 SV *tmp = sv_newmortal();
1666 Perl_croak(aTHX_ "No such hook: %s",
1667 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1668 }
748a9306 1669 i = 0;
38a124f0 1670 if (svp && *svp) {
9289f461
RGS
1671 if (*svp != PERL_WARNHOOK_FATAL)
1672 to_dec = *svp;
cbbf8932 1673 *svp = NULL;
4633a7c4 1674 }
748a9306
LW
1675 }
1676 else {
708854f2
NC
1677 i = (I16)mg->mg_private;
1678 if (!i) {
84c7b88c 1679 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1680 mg->mg_private = (U16)i;
708854f2 1681 }
86d86cad 1682 if (i <= 0) {
84c7b88c
BF
1683 if (sv) {
1684 SV *tmp = sv_newmortal();
1685 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1686 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1687 }
748a9306
LW
1688 return 0;
1689 }
2d4fcd5e
AJ
1690#ifdef HAS_SIGPROCMASK
1691 /* Avoid having the signal arrive at a bad time, if possible. */
1692 sigemptyset(&set);
1693 sigaddset(&set,i);
1694 sigprocmask(SIG_BLOCK, &set, &save);
1695 ENTER;
9ff8e806 1696 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1697 SAVEFREESV(save_sv);
1698 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1699#endif
1700 PERL_ASYNC_CHECK();
2e34cc90 1701#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1702 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1703#endif
23ada85b 1704#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1705 PL_sig_ignoring[i] = 0;
85b332e2 1706#endif
2e34cc90 1707#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1708 PL_sig_defaulting[i] = 0;
2e34cc90 1709#endif
2d4fcd5e 1710 to_dec = PL_psig_ptr[i];
38a124f0
NC
1711 if (sv) {
1712 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1713 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1714
1715 /* Signals don't change name during the program's execution, so once
1716 they're cached in the appropriate slot of PL_psig_name, they can
1717 stay there.
1718
1719 Ideally we'd find some way of making SVs at (C) compile time, or
1720 at least, doing most of the work. */
1721 if (!PL_psig_name[i]) {
1722 PL_psig_name[i] = newSVpvn(s, len);
1723 SvREADONLY_on(PL_psig_name[i]);
1724 }
38a124f0 1725 } else {
79fd3822 1726 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1727 PL_psig_name[i] = NULL;
1728 PL_psig_ptr[i] = NULL;
1729 }
748a9306 1730 }
38a124f0 1731 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1732 if (i) {
5c1546dc 1733 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1734 }
748a9306 1735 else
b37c2d43 1736 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1737 } else {
9dfa190b
NC
1738 if (sv && SvOK(sv)) {
1739 s = SvPV_force(sv, len);
1740 } else {
1741 sv = NULL;
1742 }
84c7b88c 1743 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1744 if (i) {
23ada85b 1745#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1746 PL_sig_ignoring[i] = 1;
1747 (void)rsignal(i, PL_csighandlerp);
85b332e2 1748#else
9dfa190b 1749 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1750#endif
9dfa190b 1751 }
2d4fcd5e 1752 }
84c7b88c 1753 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1754 if (i) {
2e34cc90 1755#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1756 PL_sig_defaulting[i] = 1;
1757 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1758#else
9dfa190b 1759 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1760#endif
9dfa190b
NC
1761 }
1762 }
1763 else {
1764 /*
1765 * We should warn if HINT_STRICT_REFS, but without
1766 * access to a known hint bit in a known OP, we can't
1767 * tell whether HINT_STRICT_REFS is in force or not.
1768 */
0687887e 1769 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1770 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1771 SV_GMAGIC);
1772 if (i)
1773 (void)rsignal(i, PL_csighandlerp);
1774 else
1775 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1776 }
748a9306 1777 }
9dfa190b 1778
2d4fcd5e
AJ
1779#ifdef HAS_SIGPROCMASK
1780 if(i)
1781 LEAVE;
1782#endif
ef8d46e8 1783 SvREFCNT_dec(to_dec);
79072805
LW
1784 return 0;
1785}
64ca3a65 1786#endif /* !PERL_MICRO */
79072805
LW
1787
1788int
864dbfa3 1789Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1790{
7918f24d 1791 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1792 PERL_UNUSED_ARG(sv);
e1a479c5 1793
89c14e2e 1794 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1795 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1796 return 0;
1797
0e446081 1798 return magic_clearisa(NULL, mg);
463ee0b2
LW
1799}
1800
0e446081 1801/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1802int
52b45067
RD
1803Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1804{
52b45067 1805 HV* stash;
7918f24d
NC
1806 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1807
52b45067 1808 /* Bail out if destruction is going on */
627364f1 1809 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1810
0e446081
NC
1811 if (sv)
1812 av_clear(MUTABLE_AV(sv));
52b45067 1813
6624142a
FC
1814 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1815 /* This occurs with setisa_elem magic, which calls this
1816 same function. */
1817 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1818
316ebaf2 1819 assert(mg);
6624142a
FC
1820 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1821 SV **svp = AvARRAY((AV *)mg->mg_obj);
1822 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1823 while (items--) {
1824 stash = GvSTASH((GV *)*svp++);
1825 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1826 }
1827
1828 return 0;
1829 }
1830
52b45067 1831 stash = GvSTASH(
6624142a 1832 (const GV *)mg->mg_obj
52b45067
RD
1833 );
1834
00169e2c
FC
1835 /* The stash may have been detached from the symbol table, so check its
1836 name before doing anything. */
1837 if (stash && HvENAME_get(stash))
5562fa71 1838 mro_isa_changed_in(stash);
52b45067
RD
1839
1840 return 0;
1841}
1842
1843int
864dbfa3 1844Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1845{
85fbaab2 1846 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1847 I32 i = 0;
7918f24d
NC
1848
1849 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1850 PERL_UNUSED_ARG(mg);
7719e241 1851
6ff81951 1852 if (hv) {
497b47a8 1853 (void) hv_iterinit(hv);
ad64d0ec 1854 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1855 i = HvUSEDKEYS(hv);
497b47a8
JH
1856 else {
1857 while (hv_iternext(hv))
1858 i++;
1859 }
6ff81951
GS
1860 }
1861
1862 sv_setiv(sv, (IV)i);
1863 return 0;
1864}
1865
1866int
864dbfa3 1867Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1868{
7918f24d 1869 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1870 PERL_UNUSED_ARG(mg);
946ec16e 1871 if (LvTARG(sv)) {
85fbaab2 1872 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1873 }
1874 return 0;
ac27b0f5 1875}
946ec16e 1876
efaf3674
DM
1877/*
1878=for apidoc magic_methcall
1879
1880Invoke a magic method (like FETCH).
1881
2baee27b
FC
1882C<sv> and C<mg> are the tied thingy and the tie magic.
1883
1884C<meth> is the name of the method to call.
1885
1886C<argc> is the number of args (in addition to $self) to pass to the method.
1887
1888The C<flags> can be:
1889
1890 G_DISCARD invoke method with G_DISCARD flag and don't
1891 return a value
1892 G_UNDEF_FILL fill the stack with argc pointers to
1893 PL_sv_undef
1894
1895The arguments themselves are any values following the C<flags> argument.
efaf3674 1896
796b6530 1897Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1898
1899
1900=cut
1901*/
1902
1903SV*
36925d9e 1904Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1905 U32 argc, ...)
a0d0e21e
LW
1906{
1907 dSP;
efaf3674 1908 SV* ret = NULL;
463ee0b2 1909
7918f24d
NC
1910 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1911
efaf3674 1912 ENTER;
d1d7a15d
NC
1913
1914 if (flags & G_WRITING_TO_STDERR) {
1915 SAVETMPS;
1916
2782061f 1917 save_re_context();
d1d7a15d
NC
1918 SAVESPTR(PL_stderrgv);
1919 PL_stderrgv = NULL;
1920 }
1921
efaf3674 1922 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1923 PUSHMARK(SP);
efaf3674 1924
052a7c76
DM
1925 /* EXTEND() expects a signed argc; don't wrap when casting */
1926 assert(argc <= I32_MAX);
1927 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1928 PUSHs(SvTIED_obj(sv, mg));
1929 if (flags & G_UNDEF_FILL) {
1930 while (argc--) {
efaf3674 1931 PUSHs(&PL_sv_undef);
93965878 1932 }
67549bd2 1933 } else if (argc > 0) {
046b0c7d
NC
1934 va_list args;
1935 va_start(args, argc);
1936
1937 do {
35bc1e35
JK
1938 SV *const this_sv = va_arg(args, SV *);
1939 PUSHs(this_sv);
046b0c7d
NC
1940 } while (--argc);
1941
1942 va_end(args);
88e89b8a 1943 }
463ee0b2 1944 PUTBACK;
efaf3674 1945 if (flags & G_DISCARD) {
36925d9e 1946 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1947 }
1948 else {
36925d9e 1949 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1950 ret = *PL_stack_sp--;
1951 }
1952 POPSTACK;
d1d7a15d
NC
1953 if (flags & G_WRITING_TO_STDERR)
1954 FREETMPS;
efaf3674
DM
1955 LEAVE;
1956 return ret;
1957}
1958
efaf3674 1959/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1960
efaf3674 1961STATIC SV*
36925d9e 1962S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1963 int n, SV *val)
1964{
efaf3674
DM
1965 SV* arg1 = NULL;
1966
1967 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1968
1969 if (mg->mg_ptr) {
1970 if (mg->mg_len >= 0) {
db4b3a1d 1971 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1972 }
1973 else if (mg->mg_len == HEf_SVKEY)
1974 arg1 = MUTABLE_SV(mg->mg_ptr);
1975 }
1976 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1977 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1978 sv_2mortal(arg1);
1979 }
1980 if (!arg1) {
046b0c7d 1981 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1982 }
046b0c7d 1983 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1984}
1985
76e3520e 1986STATIC int
36925d9e 1987S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1988{
efaf3674 1989 SV* ret;
463ee0b2 1990
7918f24d
NC
1991 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1992
efaf3674
DM
1993 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1994 if (ret)
1995 sv_setsv(sv, ret);
a0d0e21e
LW
1996 return 0;
1997}
463ee0b2 1998
a0d0e21e 1999int
864dbfa3 2000Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2001{
7918f24d
NC
2002 PERL_ARGS_ASSERT_MAGIC_GETPACK;
2003
fd69380d 2004 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 2005 mg->mg_flags |= MGf_GSKIP;
36925d9e 2006 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
2007 return 0;
2008}
2009
2010int
864dbfa3 2011Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 2012{
b112cff9
DM
2013 MAGIC *tmg;
2014 SV *val;
7918f24d
NC
2015
2016 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2017
b112cff9
DM
2018 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2019 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2020 * public flags indicate its value based on copying from $val. Doing
2021 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2022 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2023 * wrong if $val happened to be tainted, as sv hasn't got magic
2024 * enabled, even though taint magic is in the chain. In which case,
2025 * fake up a temporary tainted value (this is easier than temporarily
2026 * re-enabling magic on sv). */
2027
284167a5 2028 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2029 && (tmg->mg_len & 1))
2030 {
2031 val = sv_mortalcopy(sv);
2032 SvTAINTED_on(val);
2033 }
2034 else
2035 val = sv;
2036
36925d9e 2037 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2038 return 0;
2039}
2040
2041int
864dbfa3 2042Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2043{
7918f24d
NC
2044 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2045
4c13be3f 2046 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2047 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2048}
463ee0b2 2049
93965878
NIS
2050
2051U32
864dbfa3 2052Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2053{
22846ab4 2054 I32 retval = 0;
efaf3674 2055 SV* retsv;
93965878 2056
7918f24d
NC
2057 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2058
36925d9e 2059 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2060 if (retsv) {
2061 retval = SvIV(retsv)-1;
22846ab4
AB
2062 if (retval < -1)
2063 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2064 }
22846ab4 2065 return (U32) retval;
93965878
NIS
2066}
2067
cea2e8a9
GS
2068int
2069Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2070{
7918f24d
NC
2071 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2072
36925d9e 2073 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2074 return 0;
2075}
2076
2077int
864dbfa3 2078Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2079{
efaf3674 2080 SV* ret;
463ee0b2 2081
7918f24d
NC
2082 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2083
36925d9e
RZ
2084 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2085 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2086 if (ret)
2087 sv_setsv(key,ret);
79072805
LW
2088 return 0;
2089}
2090
2091int
1146e912 2092Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2093{
7918f24d
NC
2094 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2095
36925d9e 2096 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2097}
a0d0e21e 2098
a3bcc51e
TP
2099SV *
2100Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2101{
5fcbf73d 2102 SV *retval;
ad64d0ec
NC
2103 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2104 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2105
7918f24d
NC
2106 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2107
a3bcc51e
TP
2108 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2109 SV *key;
bfcb3514 2110 if (HvEITER_get(hv))
a3bcc51e
TP
2111 /* we are in an iteration so the hash cannot be empty */
2112 return &PL_sv_yes;
2113 /* no xhv_eiter so now use FIRSTKEY */
2114 key = sv_newmortal();
ad64d0ec 2115 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2116 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2117 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2118 }
2119
2120 /* there is a SCALAR method that we can call */
36925d9e 2121 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2122 if (!retval)
5fcbf73d 2123 retval = &PL_sv_undef;
a3bcc51e
TP
2124 return retval;
2125}
2126
a0d0e21e 2127int
864dbfa3 2128Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2129{
089b5c60 2130 SV **svp;
7918f24d
NC
2131
2132 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2133
089b5c60
NC
2134 /* The magic ptr/len for the debugger's hash should always be an SV. */
2135 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2136 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2137 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2138 }
2139
2140 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2141 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2142 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2143 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2144
8772537c 2145 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2146 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2147 if (o) {
2148#ifdef PERL_DEBUG_READONLY_OPS
2149 Slab_to_rw(OpSLAB(o));
2150#endif
2151 /* set or clear breakpoint in the relevant control op */
089b5c60 2152 if (SvTRUE(sv))
88df5f01 2153 o->op_flags |= OPf_SPECIAL;
8772537c 2154 else
88df5f01
FC
2155 o->op_flags &= ~OPf_SPECIAL;
2156#ifdef PERL_DEBUG_READONLY_OPS
2157 Slab_to_ro(OpSLAB(o));
2158#endif
8772537c 2159 }
5df8de69 2160 }
79072805
LW
2161 return 0;
2162}
2163
2164int
8772537c 2165Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2166{
502c6561 2167 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2168
2169 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2170
83bf042f 2171 if (obj) {
e1dccc0d 2172 sv_setiv(sv, AvFILL(obj));
83bf042f 2173 } else {
3773545d 2174 sv_set_undef(sv);
83bf042f 2175 }
79072805
LW
2176 return 0;
2177}
2178
2179int
864dbfa3 2180Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2181{
502c6561 2182 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2183
2184 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2185
83bf042f 2186 if (obj) {
e1dccc0d 2187 av_fill(obj, SvIV(sv));
83bf042f 2188 } else {
a2a5de95
NC
2189 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2190 "Attempt to set length of freed array");
83bf042f
NC
2191 }
2192 return 0;
2193}
2194
2195int
83f29afa
VP
2196Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2197{
83f29afa
VP
2198 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2199 PERL_UNUSED_ARG(sv);
dc3bf405 2200 PERL_UNUSED_CONTEXT;
83f29afa
VP
2201
2202 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2203 if (sizeof(IV) == sizeof(SSize_t)) {
2204 *((IV *) &(mg->mg_len)) = 0;
2205 } else {
2206 if (mg->mg_ptr)
2207 *((IV *) mg->mg_ptr) = 0;
2208 }
83f29afa
VP
2209
2210 return 0;
2211}
2212
2213int
83bf042f
NC
2214Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2215{
7918f24d 2216 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2217 PERL_UNUSED_ARG(sv);
7918f24d 2218
94f3782b
DM
2219 /* during global destruction, mg_obj may already have been freed */
2220 if (PL_in_clean_all)
1ea47f64 2221 return 0;
94f3782b 2222
83bf042f
NC
2223 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2224
2225 if (mg) {
2226 /* arylen scalar holds a pointer back to the array, but doesn't own a
2227 reference. Hence the we (the array) are about to go away with it
2228 still pointing at us. Clear its pointer, else it would be pointing
2229 at free memory. See the comment in sv_magic about reference loops,
2230 and why it can't own a reference to us. */
2231 mg->mg_obj = 0;
2232 }
a0d0e21e
LW
2233 return 0;
2234}
2235
2236int
864dbfa3 2237Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2238{
16eb5365 2239 SV* const lsv = LvTARG(sv);
96c2a8ff 2240 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2241
2242 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2243 PERL_UNUSED_ARG(mg);
ac27b0f5 2244
6174b39a
FC
2245 if (found && found->mg_len != -1) {
2246 STRLEN i = found->mg_len;
25fdce4a 2247 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2248 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2249 sv_setuv(sv, i);
a0d0e21e 2250 return 0;
a0d0e21e 2251 }
3773545d 2252 sv_set_undef(sv);
a0d0e21e
LW
2253 return 0;
2254}
2255
2256int
864dbfa3 2257Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2258{
16eb5365 2259 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2260 SSize_t pos;
2261 STRLEN len;
53d44271 2262 MAGIC* found;
aec43834 2263 const char *s;
a0d0e21e 2264
7918f24d 2265 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2266 PERL_UNUSED_ARG(mg);
ac27b0f5 2267
96c2a8ff 2268 found = mg_find_mglob(lsv);
3881461a 2269 if (!found) {
a0d0e21e
LW
2270 if (!SvOK(sv))
2271 return 0;
96c2a8ff 2272 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2273 }
2274 else if (!SvOK(sv)) {
3881461a 2275 found->mg_len = -1;
a0d0e21e
LW
2276 return 0;
2277 }
aec43834 2278 s = SvPV_const(lsv, len);
a0d0e21e 2279
e1dccc0d 2280 pos = SvIV(sv);
a0ed51b3 2281
7e2040f0 2282 if (DO_UTF8(lsv)) {
19742f39 2283 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2284 if (ulen)
2285 len = ulen;
a0ed51b3
LW
2286 }
2287
a0d0e21e
LW
2288 if (pos < 0) {
2289 pos += len;
2290 if (pos < 0)
2291 pos = 0;
2292 }
eb160463 2293 else if (pos > (SSize_t)len)
a0d0e21e 2294 pos = len;
a0ed51b3 2295
3881461a 2296 found->mg_len = pos;
25fdce4a 2297 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2298
79072805
LW
2299 return 0;
2300}
2301
2302int
864dbfa3 2303Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2304{
2305 STRLEN len;
35a4481c 2306 SV * const lsv = LvTARG(sv);
b83604b4 2307 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2308 STRLEN offs = LvTARGOFF(sv);
2309 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2310 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2311 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2312
2313 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2314 PERL_UNUSED_ARG(mg);
6ff81951 2315
83f78d1a 2316 if (!translate_substr_offsets(
4ddea69a 2317 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2318 negoff ? -(IV)offs : (IV)offs, !negoff,
2319 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2320 )) {
2321 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2322 sv_set_undef(sv);
83f78d1a
FC
2323 return 0;
2324 }
2325
9aa983d2 2326 if (SvUTF8(lsv))
4ddea69a 2327 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2328 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2329 if (SvUTF8(lsv))
2ef4b674 2330 SvUTF8_on(sv);
6ff81951
GS
2331 return 0;
2332}
2333
2334int
864dbfa3 2335Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2336{
83f78d1a 2337 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2338 const char * const tmps = SvPV_const(sv, len);
dd374669 2339 SV * const lsv = LvTARG(sv);
777f7c56
EB
2340 STRLEN lvoff = LvTARGOFF(sv);
2341 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2342 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2343 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2344
2345 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2346 PERL_UNUSED_ARG(mg);
075a4a2b 2347
a74fb2cd
FC
2348 SvGETMAGIC(lsv);
2349 if (SvROK(lsv))
2350 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2351 "Attempt to use reference as lvalue in substr"
2352 );
fc061ed8
FC
2353 SvPV_force_nomg(lsv,lsv_len);
2354 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2355 if (!translate_substr_offsets(
2356 lsv_len,
2357 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2358 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2359 ))
2360 Perl_croak(aTHX_ "substr outside of string");
2361 oldtarglen = lvlen;
1aa99e6b 2362 if (DO_UTF8(sv)) {
73a087f0 2363 sv_utf8_upgrade_nomg(lsv);
d931b1be 2364 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2365 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2366 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2367 SvUTF8_on(lsv);
2368 }
0d336106 2369 else if (SvUTF8(lsv)) {
5fcbf73d 2370 const char *utf8;
d931b1be 2371 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2372 newtarglen = len;
5fcbf73d 2373 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2374 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2375 Safefree(utf8);
1aa99e6b 2376 }
b76f3ce2 2377 else {
a74fb2cd 2378 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2379 newtarglen = len;
b76f3ce2 2380 }
83f78d1a
FC
2381 if (!neglen) LvTARGLEN(sv) = newtarglen;
2382 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2383
79072805
LW
2384 return 0;
2385}
2386
2387int
864dbfa3 2388Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2389{
7918f24d 2390 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2391 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2392#ifdef NO_TAINT_SUPPORT
2393 PERL_UNUSED_ARG(mg);
2394#endif
7918f24d 2395
64ff300b 2396 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2397 return 0;
2398}
2399
2400int
864dbfa3 2401Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2402{
7918f24d 2403 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2404 PERL_UNUSED_ARG(sv);
7918f24d 2405
b01e650a 2406 /* update taint status */
284167a5 2407 if (TAINT_get)
b01e650a
DM
2408 mg->mg_len |= 1;
2409 else
2410 mg->mg_len &= ~1;
463ee0b2
LW
2411 return 0;
2412}
2413
2414int
864dbfa3 2415Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2416{
35a4481c 2417 SV * const lsv = LvTARG(sv);
1b92e694 2418 char errflags = LvFLAGS(sv);
7918f24d
NC
2419
2420 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2421 PERL_UNUSED_ARG(mg);
6ff81951 2422
1b92e694 2423 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2424 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2425 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2426
6ff81951
GS
2427 return 0;
2428}
2429
2430int
864dbfa3 2431Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2432{
7918f24d 2433 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2434 PERL_UNUSED_ARG(mg);
79072805
LW
2435 do_vecset(sv); /* XXX slurp this routine */
2436 return 0;
2437}
2438
13733cde
FC
2439SV *
2440Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2441{
a0714e2c 2442 SV *targ = NULL;
13733cde
FC
2443 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2444 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2445 assert(mg);
5f05dabc 2446 if (LvTARGLEN(sv)) {
68dc0745 2447 if (mg->mg_obj) {
8772537c 2448 SV * const ahv = LvTARG(sv);
85fbaab2 2449 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2450 if (he)
2451 targ = HeVAL(he);
68dc0745 2452 }
bbfdc870 2453 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2454 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2455 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2456 {
2457 if (SvRMAGICAL(av)) {
2458 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2459 targ = svp ? *svp : NULL;
2460 }
2461 else
bbfdc870 2462 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2463 }
68dc0745 2464 }
46da273f 2465 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2466 /* somebody else defined it for us */
2467 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2468 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2469 LvTARGLEN(sv) = 0;
2470 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2471 mg->mg_obj = NULL;
68dc0745
PP
2472 mg->mg_flags &= ~MGf_REFCOUNTED;
2473 }
13733cde 2474 return targ;
5f05dabc 2475 }
71be2cbc 2476 else
13733cde
FC
2477 return LvTARG(sv);
2478}
2479
2480int
2481Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2482{
2483 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2484
2485 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2486 return 0;
2487}
2488
2489int
864dbfa3 2490Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2491{
7918f24d 2492 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2493 PERL_UNUSED_ARG(mg);
71be2cbc 2494 if (LvTARGLEN(sv))
68dc0745
PP
2495 vivify_defelem(sv);
2496 if (LvTARG(sv)) {
5f05dabc 2497 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2498 SvSETMAGIC(LvTARG(sv));
2499 }
5f05dabc
PP
2500 return 0;
2501}
2502
71be2cbc 2503void
864dbfa3 2504Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2505{
74e13ce4 2506 MAGIC *mg;
a0714e2c 2507 SV *value = NULL;
71be2cbc 2508
7918f24d
NC
2509 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2510
14befaf4 2511 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2512 return;
68dc0745 2513 if (mg->mg_obj) {
8772537c 2514 SV * const ahv = LvTARG(sv);
85fbaab2 2515 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2516 if (he)
2517 value = HeVAL(he);
3280af22 2518 if (!value || value == &PL_sv_undef)
be2597df 2519 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2520 }
bbfdc870
FC
2521 else if (LvSTARGOFF(sv) < 0)
2522 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2523 else {
502c6561 2524 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2525 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2526 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2527 else {
bbfdc870 2528 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2529 if (!svp || !(value = *svp))
bbfdc870 2530 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2531 }
2532 }
b37c2d43 2533 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2534 SvREFCNT_dec(LvTARG(sv));
2535 LvTARG(sv) = value;
71be2cbc 2536 LvTARGLEN(sv) = 0;
68dc0745 2537 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2538 mg->mg_obj = NULL;
68dc0745 2539 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2540}
2541
2542int
1f1dcfb5
FC
2543Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2544{
2545 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2546 PERL_UNUSED_ARG(mg);
2547 sv_unmagic(sv, PERL_MAGIC_nonelem);
2548 return 0;
2549}
2550
2551int
864dbfa3 2552Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2553{
7918f24d 2554 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2555 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2556 return 0;
810b8aa5
GS
2557}
2558
2559int
864dbfa3 2560Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2561{
7918f24d 2562 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2563 PERL_UNUSED_CONTEXT;
0177730e 2564 PERL_UNUSED_ARG(sv);
565764a8 2565 mg->mg_len = -1;
93a17b20
LW
2566 return 0;
2567}
2568
2569int
864dbfa3 2570Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2571{
35a4481c 2572 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2573
7918f24d
NC
2574 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2575
79072805 2576 if (uf && uf->uf_set)
24f81a43 2577 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2578 return 0;
2579}
2580
c277df42 2581int
faf82a0b
AE
2582Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2583{
488344d2 2584 const char type = mg->mg_type;
7918f24d
NC
2585
2586 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2587
a5c7cb08
DM
2588 assert( type == PERL_MAGIC_fm
2589 || type == PERL_MAGIC_qr
2590 || type == PERL_MAGIC_bm);
488344d2 2591 return sv_unmagic(sv, type);
faf82a0b
AE
2592}
2593
7a4c00b4 2594#ifdef USE_LOCALE_COLLATE
79072805 2595int
864dbfa3 2596Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2597{
7918f24d
NC
2598 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2599
bbce6d69 2600 /*
838b5b74 2601 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2602 * and vanished with a faint plop.
2603 */
96a5add6 2604 PERL_UNUSED_CONTEXT;
8772537c 2605 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2606 if (mg->mg_ptr) {
2607 Safefree(mg->mg_ptr);
2608 mg->mg_ptr = NULL;
565764a8 2609 mg->mg_len = -1;
7a4c00b4 2610 }
bbce6d69
PP
2611 return 0;
2612}
7a4c00b4 2613#endif /* USE_LOCALE_COLLATE */
bbce6d69 2614
7e8c5dac
HS
2615/* Just clear the UTF-8 cache data. */
2616int
2617Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2618{
7918f24d 2619 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2620 PERL_UNUSED_CONTEXT;
8772537c 2621 PERL_UNUSED_ARG(sv);
7e8c5dac 2622 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2623 mg->mg_ptr = NULL;
7e8c5dac
HS
2624 mg->mg_len = -1; /* The mg_len holds the len cache. */
2625 return 0;
2626}
2627
bbce6d69 2628int
9cce4f9a
FC
2629Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2630{
9782ce69 2631 const char *bad = NULL;
9cce4f9a 2632 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2633 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2634 switch (mg->mg_private & OPpLVREF_TYPE) {
2635 case OPpLVREF_SV:
2636 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2637 bad = " SCALAR";
2638 break;
2639 case OPpLVREF_AV:
2640 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2641 bad = "n ARRAY";
2642 break;
2643 case OPpLVREF_HV:
2644 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2645 bad = " HASH";
2646 break;
2647 case OPpLVREF_CV:
2648 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2649 bad = " CODE";
2650 }
2651 if (bad)
26a50d99 2652 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2653 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2654 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2655 case 0:
2656 {
2657 SV * const old = PAD_SV(mg->mg_len);
2658 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2659 SvREFCNT_dec(old);
2660 break;
2661 }
2662 case SVt_PVGV:
2663 gv_setref(mg->mg_obj, sv);
2664 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2665 break;
2666 case SVt_PVAV:
2667 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2668 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2669 break;
2670 case SVt_PVHV:
7fcb36d5
JH
2671 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2672 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2673 }
d39c26a6
FC
2674 if (mg->mg_flags & MGf_PERSIST)
2675 NOOP; /* This sv is in use as an iterator var and will be reused,
2676 so we must leave the magic. */
2677 else
2678 /* This sv could be returned by the assignment op, so clear the
2679 magic, as lvrefs are an implementation detail that must not be
2680 leaked to the user. */
2681 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2682 return 0;
2683}
2684
f1540bed
JH
2685static void
2686S_set_dollarzero(pTHX_ SV *sv)
2687 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2688{
2689#ifdef USE_ITHREADS
2690 dVAR;
2691#endif
2692 const char *s;
2693 STRLEN len;
f1540bed
JH
2694#ifdef HAS_SETPROCTITLE
2695 /* The BSDs don't show the argv[] in ps(1) output, they
2696 * show a string from the process struct and provide
2697 * the setproctitle() routine to manipulate that. */
2698 if (PL_origalen != 1) {
2699 s = SvPV_const(sv, len);
38626956 2700# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2701 /* The leading "-" removes the "perl: " prefix,
2702 * but not the "(perl) suffix from the ps(1)
2703 * output, because that's what ps(1) shows if the
2704 * argv[] is modified. */
2705 setproctitle("-%s", s);
2706# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2707 /* This doesn't really work if you assume that
2708 * $0 = 'foobar'; will wipe out 'perl' from the $0
2709 * because in ps(1) output the result will be like
2710 * sprintf("perl: %s (perl)", s)
2711 * I guess this is a security feature:
2712 * one (a user process) cannot get rid of the original name.
2713 * --jhi */
2714 setproctitle("%s", s);
2715# endif
2716 }
2717#elif defined(__hpux) && defined(PSTAT_SETCMD)
2718 if (PL_origalen != 1) {
2719 union pstun un;
2720 s = SvPV_const(sv, len);
2721 un.pst_command = (char *)s;
2722 pstat(PSTAT_SETCMD, un, len, 0, 0);
2723 }
2724#else
2725 if (PL_origalen > 1) {
4f3e04fd 2726 I32 i;
f1540bed
JH
2727 /* PL_origalen is set in perl_parse(). */
2728 s = SvPV_force(sv,len);
2729 if (len >= (STRLEN)PL_origalen-1) {
2730 /* Longer than original, will be truncated. We assume that
2731 * PL_origalen bytes are available. */
2732 Copy(s, PL_origargv[0], PL_origalen-1, char);
2733 }
2734 else {
2735 /* Shorter than original, will be padded. */
2736#ifdef PERL_DARWIN
2737 /* Special case for Mac OS X: see [perl #38868] */
2738 const int pad = 0;
2739#else
2740 /* Is the space counterintuitive? Yes.
2741 * (You were expecting \0?)
2742 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2743 * --jhi */
2744 const int pad = ' ';
2745#endif
2746 Copy(s, PL_origargv[0], len, char);
2747 PL_origargv[0][len] = 0;
2748 memset(PL_origargv[0] + len + 1,
2749 pad, PL_origalen - len - 1);
2750 }
2751 PL_origargv[0][PL_origalen-1] = 0;
2752 for (i = 1; i < PL_origargc; i++)
2753 PL_origargv[i] = 0;
2754#ifdef HAS_PRCTL_SET_NAME
2755 /* Set the legacy process name in addition to the POSIX name on Linux */
2756 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2757 /* diag_listed_as: SKIPME */
2758 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2759 }
2760#endif
2761 }
2762#endif
2763}
2764
9cce4f9a 2765int
864dbfa3 2766Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2767{
20b7effb 2768#ifdef USE_ITHREADS
97aff369 2769 dVAR;
20b7effb 2770#endif
eb578fdb
KW
2771 I32 paren;
2772 const REGEXP * rx;
79072805 2773 I32 i;
8990e307 2774 STRLEN len;
125b9982 2775 MAGIC *tmg;
2fdbfb4d 2776
7918f24d
NC
2777 PERL_ARGS_ASSERT_MAGIC_SET;
2778
e91d8259 2779 if (!mg->mg_ptr) {
960b831f 2780 paren = mg->mg_len;
1e05feb3 2781 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2782 setparen_got_rx:
2fdbfb4d 2783 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2784 } else {
2fdbfb4d
AB
2785 /* Croak with a READONLY error when a numbered match var is
2786 * set without a previous pattern match. Unless it's C<local $1>
2787 */
e91d8259 2788 croakparen:
2fdbfb4d 2789 if (!PL_localizing) {
cb077ed2 2790 Perl_croak_no_modify();
2fdbfb4d
AB
2791 }
2792 }
e91d8259
NC
2793 return 0;
2794 }
2795
2796 switch (*mg->mg_ptr) {
748a9306 2797 case '\001': /* ^A */
f2da823f
FC
2798 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2799 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2800 FmLINES(PL_bodytarget) = 0;
2801 if (SvPOK(PL_bodytarget)) {
2802 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2803 char *e = SvEND(PL_bodytarget);
2804 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2805 FmLINES(PL_bodytarget)++;
2806 s++;
2807 }
2808 }
125b9982 2809 /* mg_set() has temporarily made sv non-magical */
284167a5 2810 if (TAINTING_get) {
125b9982
NT
2811 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2812 SvTAINTED_on(PL_bodytarget);
2813 else
2814 SvTAINTED_off(PL_bodytarget);
2815 }
748a9306 2816 break;
49460fe6 2817 case '\003': /* ^C */
f2338a2e 2818 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2819 break;
2820
79072805 2821 case '\004': /* ^D */
b4ab917c 2822#ifdef DEBUGGING
a9e2d2bf
DM
2823 {
2824 const char *s = SvPV_nolen_const(sv);
2825 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2826 if (DEBUG_x_TEST || DEBUG_B_TEST)
2827 dump_all_perl(!DEBUG_B_TEST);
2828 }
b4ab917c 2829#else
38ab35f8 2830 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2831#endif
79072805 2832 break;
28f23441 2833 case '\005': /* ^E */
d0063567 2834 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2835#ifdef VMS
38ab35f8 2836 set_vaxc_errno(SvIV(sv));
2abc681d 2837#elif defined(WIN32)
d0063567 2838 SetLastError( SvIV(sv) );
2abc681d 2839#elif defined(OS2)
38ab35f8 2840 os2_setsyserrno(SvIV(sv));
2abc681d 2841#else
d0063567 2842 /* will anyone ever use this? */
38ab35f8 2843 SETERRNO(SvIV(sv), 4);
22fae026 2844#endif
d0063567 2845 }
fd503f5c
DIM
2846 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2847 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2848 break;
79072805 2849 case '\006': /* ^F */
9f601cf3
TC
2850 if (mg->mg_ptr[1] == '\0') {
2851 PL_maxsysfd = SvIV(sv);
2852 }
2853 else if (strEQ(mg->mg_ptr + 1, "EATURE_BITS")) {
2854 PL_compiling.cop_features = SvUV(sv);
2855 }
79072805 2856 break;
a0d0e21e 2857 case '\010': /* ^H */
efa571ab
KW
2858 {
2859 U32 save_hints = PL_hints;
5d382c25 2860 PL_hints = SvUV(sv);
efa571ab
KW
2861
2862 /* If wasn't UTF-8, and now is, notify the parser */
2863 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2864 notify_parser_that_changed_to_utf8();
2865 }
2866 }
a0d0e21e 2867 break;
9d116dd7 2868 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2869 Safefree(PL_inplace);
bd61b366 2870 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2871 break;
d9bad346
FC
2872 case '\016': /* ^N */
2873 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2874 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2875 goto croakparen;
28f23441 2876 case '\017': /* ^O */
ac27b0f5 2877 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2878 Safefree(PL_osname);
bd61b366 2879 PL_osname = NULL;
3511154c
DM
2880 if (SvOK(sv)) {
2881 TAINT_PROPER("assigning to $^O");
2e0de35c 2882 PL_osname = savesvpv(sv);
3511154c 2883 }
ac27b0f5
NIS
2884 }
2885 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2886 STRLEN len;
2887 const char *const start = SvPV(sv, len);
b54fc2b6 2888 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2889 SV *tmp;
8b850bd5
NC
2890
2891
2892 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2893 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2894
2895 /* Opening for input is more common than opening for output, so
2896 ensure that hints for input are sooner on linked list. */
59cd0e26 2897 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2898 SvUTF8(sv))
2899 : newSVpvs_flags("", SvUTF8(sv));
2900 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2901 mg_set(tmp);
8b850bd5 2902
f747ebd6
Z
2903 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2904 SvUTF8(sv));
2905 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2906 mg_set(tmp);
ac27b0f5 2907 }
28f23441 2908 break;
79072805 2909 case '\020': /* ^P */
2fdbfb4d
AB
2910 PL_perldb = SvIV(sv);
2911 if (PL_perldb && !PL_DBsingle)
2912 init_debugger();
9b9e0be4 2913 break;
79072805 2914 case '\024': /* ^T */
88e89b8a 2915#ifdef BIG_TIME
6b88bc9c 2916 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2917#else
38ab35f8 2918 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2919#endif
79072805 2920 break;
e07ea26a
NC
2921 case '\025': /* ^UTF8CACHE */
2922 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2923 PL_utf8cache = (signed char) sv_2iv(sv);
2924 }
2925 break;
fde18df1 2926 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2927 if (*(mg->mg_ptr+1) == '\0') {
2928 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2929 i = SvIV(sv);
ac27b0f5 2930 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2931 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2932 }
599cee73 2933 }
0a378802 2934 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2935 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450 2936 if (!SvPOK(sv)) {
1113f30d
DM
2937 if (!specialWARN(PL_compiling.cop_warnings))
2938 PerlMemShared_free(PL_compiling.cop_warnings);
7e4f0450 2939 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2940 break;
2941 }
f4fc7782 2942 {
b5477537 2943 STRLEN len, i;
006c1a1d
Z
2944 int not_none = 0, not_all = 0;
2945 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2946 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2947 not_none |= ptr[i];
2948 not_all |= ptr[i] ^ 0x55;
f4fc7782 2949 }
006c1a1d 2950 if (!not_none) {
4243c432
NC
2951 if (!specialWARN(PL_compiling.cop_warnings))
2952 PerlMemShared_free(PL_compiling.cop_warnings);
2953 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2954 } else if (len >= WARNsize && !not_all) {
2955 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2956 PerlMemShared_free(PL_compiling.cop_warnings);
2957 PL_compiling.cop_warnings = pWARN_ALL;
2958 PL_dowarn |= G_WARN_ONCE ;
2959 }
d3a7d8c7 2960 else {
72dc9ed5
NC
2961 STRLEN len;
2962 const char *const p = SvPV_const(sv, len);
2963
2964 PL_compiling.cop_warnings
8ee4cf24 2965 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2966 p, len);
2967
d3a7d8c7
GS
2968 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2969 PL_dowarn |= G_WARN_ONCE ;
2970 }
f4fc7782 2971
d3a7d8c7 2972 }
4438c4b7 2973 }
971a9dd3 2974 }
8ca2a5d6
DD
2975#ifdef WIN32
2976 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2977 w32_sloppystat = (bool)sv_true(sv);
2978 }
2979#endif
79072805
LW
2980 break;
2981 case '.':
3280af22
NIS
2982 if (PL_localizing) {
2983 if (PL_localizing == 1)
7766f137 2984 SAVESPTR(PL_last_in_gv);
748a9306 2985 }
3280af22 2986 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2987 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2988 break;
2989 case '^':
acbe1b9d 2990 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2991 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2992 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2993 break;
2994 case '~':
acbe1b9d 2995 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2996 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2997 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2998 break;
2999 case '=':
acbe1b9d 3000 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
3001 break;
3002 case '-':
acbe1b9d
FC
3003 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3004 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 3005 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
3006 break;
3007 case '%':
acbe1b9d 3008 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
3009 break;
3010 case '|':
4b65379b 3011 {
099be4f1 3012 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
3013 if(!io)
3014 break;
38ab35f8 3015 if ((SvIV(sv)) == 0)
4b65379b
CS
3016 IoFLAGS(io) &= ~IOf_FLUSH;
3017 else {
3018 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3019 PerlIO *ofp = IoOFP(io);
3020 if (ofp)
3021 (void)PerlIO_flush(ofp);
3022 IoFLAGS(io) |= IOf_FLUSH;
3023 }
3024 }
79072805
LW
3025 }
3026 break;
79072805 3027 case '/':
1ab48e3a 3028 {
1ab48e3a 3029 if (SvROK(sv)) {
8d37cdf7
DIM
3030 SV *referent = SvRV(sv);
3031 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3032 /* XXX: dodgy type check: This leaves me feeling dirty, but
3033 * the alternative is to copy pretty much the entire
3034 * sv_reftype() into this routine, or to do a full string
3035 * comparison on the return of sv_reftype() both of which
3036 * make me feel worse! NOTE, do not modify this comment
3037 * without reviewing the corresponding comment in
3038 * sv_reftype(). - Yves */
1ab48e3a 3039 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3040 IV val = SvIV(referent);
1ab48e3a 3041 if (val <= 0) {
520b6fb6
DIM
3042 sv_setsv(sv, PL_rs);
3043 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3044 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3045 }
3046 } else {
ddce084a 3047 sv_setsv(sv, PL_rs);
8d37cdf7 3048 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3049 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3050 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3051 }
3052 }
b3a2acfa 3053 SvREFCNT_dec(PL_rs);
520b6fb6 3054 PL_rs = newSVsv(sv);
b3a2acfa 3055 }
79072805
LW
3056 break;
3057 case '\\':
ef8d46e8 3058 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3059 if (SvOK(sv)) {
7889fe52 3060 PL_ors_sv = newSVsv(sv);
009c130f 3061 }
e3c19b7b 3062 else {
a0714e2c 3063 PL_ors_sv = NULL;
e3c19b7b 3064 }
79072805 3065 break;
7d69d4a6
FC
3066 case '[':
3067 if (SvIV(sv) != 0)
3068 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3069 break;
79072805 3070 case '?':
ff0cee69 3071#ifdef COMPLEX_STATUS
6b88bc9c 3072 if (PL_localizing == 2) {
41cb7b2b 3073 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3074 PL_statusvalue = LvTARGOFF(sv);
3075 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3076 }
3077 else
3078#endif
3079#ifdef VMSISH_STATUS
3080 if (VMSISH_STATUS)
fb38d079 3081 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3082 else
3083#endif
38ab35f8 3084 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3085 break;
3086 case '!':
93189314
JH
3087 {
3088#ifdef VMS
3089# define PERL_VMS_BANG vaxc$errno
3090#else
3091# define PERL_VMS_BANG 0
3092#endif
79c32fc2 3093#if defined(WIN32)
c9beaf97
SH
3094 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3095 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3096#else
91487cfc 3097 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3098 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3099#endif
93189314 3100 }
79072805
LW
3101 break;
3102 case '<':
985213f2 3103 {
b469f1e0 3104 /* XXX $< currently silently ignores failures */
dfff4baf 3105 const Uid_t new_uid = SvUID(sv);
985213f2 3106 PL_delaymagic_uid = new_uid;
3280af22
NIS
3107 if (PL_delaymagic) {
3108 PL_delaymagic |= DM_RUID;
79072805
LW
3109 break; /* don't do magic till later */
3110 }
3111#ifdef HAS_SETRUID
b469f1e0 3112 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3113#elif defined(HAS_SETREUID)
b469f1e0 3114 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3115#elif defined(HAS_SETRESUID)
b469f1e0 3116 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3117#else
985213f2 3118 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3119# ifdef PERL_DARWIN
75870ed3 3120 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3121 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3122 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3123# endif
b469f1e0 3124 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3125 } else {
cea2e8a9 3126 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3127 }
79072805 3128#endif
79072805 3129 break;
985213f2 3130 }
79072805 3131 case '>':
985213f2 3132 {
b469f1e0 3133 /* XXX $> currently silently ignores failures */
dfff4baf 3134 const Uid_t new_euid = SvUID(sv);
985213f2 3135 PL_delaymagic_euid = new_euid;
3280af22
NIS
3136 if (PL_delaymagic) {
3137 PL_delaymagic |= DM_EUID;
79072805
LW
3138 break; /* don't do magic till later */
3139 }
3140#ifdef HAS_SETEUID
b469f1e0 3141 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3142#elif defined(HAS_SETREUID)
b469f1e0 3143 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3144#elif defined(HAS_SETRESUID)
b469f1e0 3145 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3146#else
985213f2 3147 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3148 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3149 else {
cea2e8a9 3150 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3151 }
79072805 3152#endif
79072805 3153 break;
985213f2 3154 }
79072805 3155 case '(':
985213f2 3156 {
b469f1e0 3157 /* XXX $( currently silently ignores failures */
dfff4baf 3158 const Gid_t new_gid = SvGID(sv);
985213f2 3159 PL_delaymagic_gid = new_gid;
3280af22
NIS
3160 if (PL_delaymagic) {
3161 PL_delaymagic |= DM_RGID;
79072805
LW
3162 break; /* don't do magic till later */
3163 }
3164#ifdef HAS_SETRGID
b469f1e0 3165 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3166#elif defined(HAS_SETREGID)
b469f1e0 3167 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3168#elif defined(HAS_SETRESGID)
b469f1e0 3169 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3170#else
985213f2 3171 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3172 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3173 else {
cea2e8a9 3174 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3175 }
79072805 3176#endif
79072805 3177 break;
985213f2 3178 }
79072805 3179 case ')':
985213f2 3180 {
0635704a
HS
3181/* (hv) best guess: maybe we'll need configure probes to do a better job,
3182 * but you can override it if you need to.
3183 */
3184#ifndef INVALID_GID
3185#define INVALID_GID ((Gid_t)-1)
3186#endif
b469f1e0 3187 /* XXX $) currently silently ignores failures */
dfff4baf 3188 Gid_t new_egid;
5cd24f17
PP
3189#ifdef HAS_SETGROUPS
3190 {
b83604b4 3191 const char *p = SvPV_const(sv, len);
757f63d8 3192 Groups_t *gary = NULL;
79e302e6
MM
3193 const char* p_end = p + len;
3194 const char* endptr = p_end;
22ff3130 3195 UV uv;
fb4089e0 3196#ifdef _SC_NGROUPS_MAX
3197 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3198
3199 if (maxgrp < 0)
3200 maxgrp = NGROUPS;
3201#else
3202 int maxgrp = NGROUPS;
3203#endif
757f63d8
SP
3204
3205 while (isSPACE(*p))
3206 ++p;
22ff3130
HS
3207 if (grok_atoUV(p, &uv, &endptr))
3208 new_egid = (Gid_t)uv;
3209 else {
0635704a 3210 new_egid = INVALID_GID;
22ff3130
HS
3211 endptr = NULL;
3212 }
fb4089e0 3213 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3214 if (endptr == NULL)
3215 break;
3216 p = endptr;
79e302e6 3217 endptr = p_end;
757f63d8
SP
3218 while (isSPACE(*p))
3219 ++p;
3220 if (!*p)
3221 break;
fdadaf77 3222 if (!gary)
757f63d8
SP
3223 Newx(gary, i + 1, Groups_t);
3224 else
3225 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3226 if (grok_atoUV(p, &uv, &endptr))
3227 gary[i] = (Groups_t)uv;
3228 else {
0635704a 3229 gary[i] = INVALID_GID;
22ff3130
HS
3230 endptr = NULL;
3231 }
757f63d8
SP
3232 }
3233 if (i)
b469f1e0 3234 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3235 Safefree(gary);
5cd24f17
PP
3236 }
3237#else /* HAS_SETGROUPS */
dfff4baf 3238 new_egid = SvGID(sv);
5cd24f17 3239#endif /* HAS_SETGROUPS */
985213f2 3240 PL_delaymagic_egid = new_egid;
3280af22
NIS
3241 if (PL_delaymagic) {
3242 PL_delaymagic |= DM_EGID;
79072805
LW
3243 break; /* don't do magic till later */
3244 }
3245#ifdef HAS_SETEGID
b469f1e0 3246 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3247#elif defined(HAS_SETREGID)
b469f1e0 3248 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3249#elif defined(HAS_SETRESGID)
b469f1e0 3250 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3251#else
985213f2 3252 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3253 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3254 else {
cea2e8a9 3255 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3256 }
79072805 3257#endif
79072805 3258 break;
985213f2 3259 }
79072805 3260 case ':':
2d8e6c8d 3261 PL_chopset = SvPV_force(sv,len);
79072805 3262 break;
9cdac2a2
FC
3263 case '$': /* $$ */
3264 /* Store the pid in mg->mg_obj so we can tell when a fork has
3265 occurred. mg->mg_obj points to *$ by default, so clear it. */
3266 if (isGV(mg->mg_obj)) {
3267 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3268 SvREFCNT_dec(mg->mg_obj);
3269 mg->mg_flags |= MGf_REFCOUNTED;
3270 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3271 }
3272 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3273 break;
79072805 3274 case '0':
e2975953 3275 LOCK_DOLLARZERO_MUTEX;
f1540bed 3276 S_set_dollarzero(aTHX_ sv);
e2975953 3277 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3278 break;
3279 }
3280 return 0;
3281}
3282
3283I32
84c7b88c
BF
3284Perl_whichsig_sv(pTHX_ SV *sigsv)
3285{
3286 const char *sigpv;
3287 STRLEN siglen;
3288 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3289 sigpv = SvPV_const(sigsv, siglen);
3290 return whichsig_pvn(sigpv, siglen);
3291}
3292
3293I32
3294Perl_whichsig_pv(pTHX_ const char *sig)
3295{
3296 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3297 return whichsig_pvn(sig, strlen(sig));
3298}
3299
3300I32
3301Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3302{
eb578fdb 3303 char* const* sigv;
7918f24d 3304
84c7b88c 3305 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3306 PERL_UNUSED_CONTEXT;
79072805 3307
aadb217d 3308 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3309 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3310 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3311#ifdef SIGCLD
84c7b88c 3312 if (memEQs(sig, len, "CHLD"))
79072805
LW
3313 return SIGCLD;
3314#endif
3315#ifdef SIGCHLD
84c7b88c 3316 if (memEQs(sig, len, "CLD"))
79072805
LW
3317 return SIGCHLD;
3318#endif
7f1236c0 3319 return -1;
79072805
LW
3320}
3321
ecfc5424 3322Signal_t
5e7940ce 3323#ifdef PERL_USE_3ARG_SIGHANDLER
e7124897 3324Perl_sighandler(int sig, Siginfo_t *sip, void *uap)
1e82f5a6
SH
3325#else
3326Perl_sighandler(int sig)
3327#endif
79072805 3328{
1018e26f
NIS
3329#ifdef PERL_GET_SIG_CONTEXT
3330 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3331#else
cea2e8a9 3332 dTHX;
71d280e3 3333#endif
79072805 3334 dSP;
a0714e2c
SS
3335 GV *gv = NULL;
3336 SV *sv = NULL;
8772537c 3337 SV * const tSv = PL_Sv;
601f1833 3338 CV *cv = NULL;
533c011a 3339 OP *myop = PL_op;
84902520 3340 U32 flags = 0;
8772537c 3341 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3342 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3343 SV *errsv_save = NULL;
71d280e3 3344
84902520 3345
727405f8 3346 if (!PL_psig_ptr[sig]) {
99ef548b 3347 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3348 PL_sig_name[sig]);
3349 exit(sig);
3350 }
ff0cee69 3351
a0d63a7b
DM
3352 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3353 /* Max number of items pushed there is 3*n or 4. We cannot fix
3354 infinity, so we fix 4 (in fact 5): */
3355 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3356 flags |= 1;
3357 PL_savestack_ix += 5; /* Protect save in progress. */
3358 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3359 }
84902520 3360 }
84902520 3361 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3362 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3363 || SvTYPE(cv) != SVt_PVCV) {
3364 HV *st;
f2c0649b 3365 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3366 }
84902520 3367
a0d0e21e 3368 if (!cv || !CvROOT(cv)) {
07c325bb 3369 const HEK * const hek = gv
1d6bb9ae
FC
3370 ? GvENAME_HEK(gv)
3371 : cv && CvNAMED(cv)
3372 ? CvNAME_HEK(cv)
07c325bb
FC
3373 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3374 if (hek)
3375 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3376 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3377 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3378 /* diag_listed_as: SIG%s handler "%s" not defined */
3379 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3380 "SIG%s handler \"__ANON__\" not defined.\n",
3381 PL_sig_name[sig]);
00d579c5 3382 goto cleanup;
79072805
LW
3383 }
3384
0c4d3b5e
DM
3385 sv = PL_psig_name[sig]
3386 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3387 : newSVpv(PL_sig_name[sig],0);
72048cfe 3388 flags |= 8;
0c4d3b5e
DM
3389 SAVEFREESV(sv);
3390
a0d63a7b
DM
3391 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3392 /* make sure our assumption about the size of the SAVEs are correct:
3393 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3394 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3395 }
e336de0d 3396
e788e7d3 3397 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3398 PUSHMARK(SP);
79072805 3399 PUSHs(sv);
8aad04aa
JH
3400#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3401 {
3402 struct sigaction oact;
3403
3404 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3405 if (sip) {
3406 HV *sih = newHV();
ad64d0ec 3407 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3408 /* The siginfo fields signo, code, errno, pid, uid,
3409 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3410 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3411 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3412#ifdef HAS_SIGINFO_SI_ERRNO
3413 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3414#endif
3415#ifdef HAS_SIGINFO_SI_STATUS
3416 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3417#endif
3418#ifdef HAS_SIGINFO_SI_UID
3419 {
3420 SV *uid = newSV(0);
3421 sv_setuid(uid, sip->si_uid);
3422 (void)hv_stores(sih, "uid", uid);
3423 }
3424#endif
3425#ifdef HAS_SIGINFO_SI_PID
3426 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3427#endif
3428#ifdef HAS_SIGINFO_SI_ADDR
3429 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3430#endif
3431#ifdef HAS_SIGINFO_SI_BAND
3432 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3433#endif
8aad04aa 3434 EXTEND(SP, 2);
ad64d0ec 3435 PUSHs(rv);
22f1178f 3436 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3437 }
b4552a27 3438
8aad04aa
JH
3439 }
3440 }
3441#endif
79072805 3442 PUTBACK;
a0d0e21e 3443
100c03aa
JL
3444 errsv_save = newSVsv(ERRSV);
3445
ad64d0ec 3446 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3447
d3acc0f7 3448 POPSTACK;
eed484f9
DD
3449 {
3450 SV * const errsv = ERRSV;
3451 if (SvTRUE_NN(errsv)) {
3452 SvREFCNT_dec(errsv_save);
c22d665b 3453#ifndef PERL_MICRO
1b266415
NIS
3454 /* Handler "died", for example to get out of a restart-able read().
3455 * Before we re-do that on its behalf re-enable the signal which was
3456 * blocked by the system when we entered.
3457 */
c22d665b 3458#ifdef HAS_SIGPROCMASK
d488af49 3459#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3460 if (sip || uap)
c22d665b 3461#endif
eed484f9
DD
3462 {
3463 sigset_t set;
3464 sigemptyset(&set);
3465 sigaddset(&set,sig);
3466 sigprocmask(SIG_UNBLOCK, &set, NULL);
3467 }