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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20"Magic" is special data attached to SV structures in order to give them
21"magical" properties. When any Perl code tries to read from, or assign to,
22an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 23with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 24give it a chance to update its internal value (get on $. writes the line
b53c43bf 25number of the last read filehandle into the SV's IV slot), while
166f8a29 26set is called after an SV has been written to, in order to allow it to make
ddfa107c 27use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
28PL_rs global variable).
29
30Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 31SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 32of functions that implement the get(), set(), length() etc functions,
154e47c8 33plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
34a MAGIC structure that contains a pointer to the object associated with the
35tie.
36
7fefc6c1
KW
37=cut
38
ccfc67b7
JH
39*/
40
79072805 41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_MG_C
79072805
LW
43#include "perl.h"
44
5cd24f17 45#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
46# ifdef I_GRP
47# include <grp.h>
48# endif
188ea221
CS
49#endif
50
757f63d8
SP
51#if defined(HAS_SETGROUPS)
52# ifndef NGROUPS
53# define NGROUPS 32
54# endif
55#endif
56
17aa7f3d
JH
57#ifdef __hpux
58# include <sys/pstat.h>
59#endif
60
7636ea95
AB
61#ifdef HAS_PRCTL_SET_NAME
62# include <sys/prctl.h>
63#endif
64
8aad04aa 65#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 66Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 67#else
e69880a5 68Signal_t Perl_csighandler(int sig);
8aad04aa 69#endif
e69880a5 70
9cffb111
OS
71#ifdef __Lynx__
72/* Missing protos on LynxOS */
73void setruid(uid_t id);
74void seteuid(uid_t id);
75void setrgid(uid_t id);
76void setegid(uid_t id);
77#endif
78
c07a80fd 79/*
4bac9ae4 80 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
82 */
83
84struct magic_state {
85 SV* mgs_sv;
455ece5e 86 I32 mgs_ss_ix;
a623f893 87 U32 mgs_flags;
150b625d 88 bool mgs_bumped;
c07a80fd 89};
455ece5e 90/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
91
92STATIC void
ff44333e 93S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
c07a80fd 94{
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d 97
ff44333e 98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 99
4bac9ae4
CS
100 assert(SvMAGICAL(sv));
101
150b625d
DM
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
110 bumped = TRUE;
111 }
8985fe98 112
8772537c 113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
114
115 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 116 mgs->mgs_sv = sv;
a623f893 117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 119 mgs->mgs_bumped = bumped;
c07a80fd 120
ff44333e 121 SvFLAGS(sv) &= ~flags;
3805b5fb 122 SvREADONLY_off(sv);
c07a80fd
PP
123}
124
ff44333e
FC
125#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
126
954c1994
GS
127/*
128=for apidoc mg_magical
129
fbe13c60 130Turns on the magical status of an SV. See C<L</sv_magic>>.
954c1994
GS
131
132=cut
133*/
134
8990e307 135void
ddeaf645 136Perl_mg_magical(SV *sv)
8990e307 137{
e1ec3a88 138 const MAGIC* mg;
7918f24d 139 PERL_ARGS_ASSERT_MG_MAGICAL;
f9c6fee5
CS
140
141 SvMAGICAL_off(sv);
218787bd 142 if ((mg = SvMAGIC(sv))) {
218787bd
VP
143 do {
144 const MGVTBL* const vtbl = mg->mg_virtual;
145 if (vtbl) {
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 SvGMAGICAL_on(sv);
148 if (vtbl->svt_set)
149 SvSMAGICAL_on(sv);
150 if (vtbl->svt_clear)
151 SvRMAGICAL_on(sv);
152 }
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
155 SvRMAGICAL_on(sv);
8990e307
LW
156 }
157}
158
954c1994
GS
159/*
160=for apidoc mg_get
161
4b1e7f06 162Do magic before a value is retrieved from the SV. The type of SV must
796b6530 163be >= C<SVt_PVMG>. See C<L</sv_magic>>.
954c1994
GS
164
165=cut
166*/
167
79072805 168int
864dbfa3 169Perl_mg_get(pTHX_ SV *sv)
79072805 170{
35a4481c 171 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 172 bool saved = FALSE;
f9c6fee5 173 bool have_new = 0;
b949b68f 174 bool taint_only = TRUE; /* the only get method seen is taint */
ff76feab 175 MAGIC *newmg, *head, *cur, *mg;
6683b158 176
7918f24d
NC
177 PERL_ARGS_ASSERT_MG_GET;
178
407287f9
FC
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
180
ff76feab
AMS
181 /* We must call svt_get(sv, mg) for each valid entry in the linked
182 list of magic. svt_get() may delete the current entry, add new
183 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184
185 newmg = cur = head = mg = SvMAGIC(sv);
186 while (mg) {
35a4481c 187 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 189
2b260de0 190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
191
192 /* taint's mg get is so dumb it doesn't need flag saving */
b949b68f
DM
193 if (mg->mg_type != PERL_MAGIC_taint) {
194 taint_only = FALSE;
195 if (!saved) {
196 save_magic(mgs_ix, sv);
197 saved = TRUE;
198 }
199 }
a9844598 200
16c91539 201 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 202
58f82c5c
DM
203 /* guard against magic having been deleted - eg FETCH calling
204 * untie */
f9c6fee5 205 if (!SvMAGIC(sv)) {
a623f893
FC
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 208 break;
f9c6fee5 209 }
b77f7d40 210
f9c6fee5 211 /* recalculate flags if this entry was deleted. */
ff76feab 212 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 215 }
7d1328bb 216 else if (vtbl == &PL_vtbl_utf8) {
b949b68f
DM
217 /* get-magic can reallocate the PV, unless there's only taint
218 * magic */
219 if (taint_only) {
220 MAGIC *mg2;
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
224 && mg2->mg_virtual
225 && mg2->mg_virtual->svt_get
226 ) {
227 taint_only = FALSE;
228 break;
229 }
230 }
231 }
232 if (!taint_only)
233 magic_setutf8(sv, mg);
7d1328bb 234 }
ff76feab 235
f9c6fee5 236 mg = nextmg;
ff76feab 237
0723351e 238 if (have_new) {
ff76feab
AMS
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
241 if (mg == head) {
0723351e 242 have_new = 0;
ff76feab
AMS
243 mg = cur;
244 head = newmg;
245 }
246 }
247
248 /* Were any new entries added? */
0723351e
NC
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
250 have_new = 1;
ff76feab
AMS
251 cur = mg;
252 mg = newmg;
a623f893
FC
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 255 }
79072805 256 }
463ee0b2 257
a9844598
CS
258 if (saved)
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
260
79072805
LW
261 return 0;
262}
263
954c1994
GS
264/*
265=for apidoc mg_set
266
fbe13c60 267Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
268
269=cut
270*/
271
79072805 272int
864dbfa3 273Perl_mg_set(pTHX_ SV *sv)
79072805 274{
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
b5ed8c44
FC
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
282
ff44333e 283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
284
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 286 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 287 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 291 }
e0a73de4 292 if (PL_localizing == 2
b5ed8c44 293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 294 continue;
2b260de0 295 if (vtbl && vtbl->svt_set)
16c91539 296 vtbl->svt_set(aTHX_ sv, mg);
79072805 297 }
463ee0b2 298
8772537c 299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
300 return 0;
301}
302
954c1994
GS
303/*
304=for apidoc mg_length
305
d4e99c76 306Reports on the SV's length in bytes, calling length magic if available,
796b6530 307but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 308magic if there is no 'length' magic, but with no indication as to
796b6530
KW
309whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310higher. Use C<sv_len()> instead.
954c1994
GS
311
312=cut
313*/
314
79072805 315U32
864dbfa3 316Perl_mg_length(pTHX_ SV *sv)
79072805
LW
317{
318 MAGIC* mg;
463ee0b2 319 STRLEN len;
463ee0b2 320
7918f24d
NC
321 PERL_ARGS_ASSERT_MG_LENGTH;
322
79072805 323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 324 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 325 if (vtbl && vtbl->svt_len) {
35a4481c 326 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 327 save_magic(mgs_ix, sv);
a0d0e21e 328 /* omit MGf_GSKIP -- not changed here */
16c91539 329 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
331 return len;
332 }
333 }
334
bd8446cf 335 (void)SvPV_const(sv, len);
463ee0b2 336 return len;
79072805
LW
337}
338
8fb26106 339I32
864dbfa3 340Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
341{
342 MAGIC* mg;
ac27b0f5 343
7918f24d
NC
344 PERL_ARGS_ASSERT_MG_SIZE;
345
93965878 346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 347 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 348 if (vtbl && vtbl->svt_len) {
35a4481c
AL
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
350 I32 len;
455ece5e 351 save_magic(mgs_ix, sv);
93965878 352 /* omit MGf_GSKIP -- not changed here */
16c91539 353 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
355 return len;
356 }
357 }
358
359 switch(SvTYPE(sv)) {
360 case SVt_PVAV:
502c6561 361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
362 case SVt_PVHV:
363 /* FIXME */
364 default:
cea2e8a9 365 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 366
93965878 367 }
a25b5927 368 NOT_REACHED; /* NOTREACHED */
93965878
NIS
369}
370
954c1994
GS
371/*
372=for apidoc mg_clear
373
fbe13c60 374Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
375
376=cut
377*/
378
79072805 379int
864dbfa3 380Perl_mg_clear(pTHX_ SV *sv)
79072805 381{
35a4481c 382 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 383 MAGIC* mg;
8ac77ac9 384 MAGIC *nextmg;
463ee0b2 385
7918f24d
NC
386 PERL_ARGS_ASSERT_MG_CLEAR;
387
455ece5e 388 save_magic(mgs_ix, sv);
463ee0b2 389
8ac77ac9 390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 391 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 392 /* omit GSKIP -- never set here */
727405f8 393
8ac77ac9
NC
394 nextmg = mg->mg_moremagic; /* it may delete itself */
395
2b260de0 396 if (vtbl && vtbl->svt_clear)
16c91539 397 vtbl->svt_clear(aTHX_ sv, mg);
79072805 398 }
463ee0b2 399
8772537c 400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
401 return 0;
402}
403
ed624ca8 404static MAGIC*
ddeaf645 405S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 406{
39de7f53
FR
407 assert(flags <= 1);
408
409 if (sv) {
410 MAGIC *mg;
411
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
414 return mg;
415 }
416 }
417 }
418
419 return NULL;
420}
421
954c1994
GS
422/*
423=for apidoc mg_find
424
796b6530 425Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
426
427=cut
428*/
429
93a17b20 430MAGIC*
ddeaf645 431Perl_mg_find(const SV *sv, int type)
93a17b20 432{
ddeaf645 433 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
434}
435
436/*
437=for apidoc mg_findext
438
439Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 440C<L</sv_magicext>>.
39de7f53
FR
441
442=cut
443*/
444
445MAGIC*
ddeaf645 446Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 447{
ddeaf645 448 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
449}
450
96c2a8ff
FC
451MAGIC *
452Perl_mg_find_mglob(pTHX_ SV *sv)
453{
454 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
455 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
456 /* This sv is only a delegate. //g magic must be attached to
457 its target. */
458 vivify_defelem(sv);
459 sv = LvTARG(sv);
460 }
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
463 return NULL;
464}
465
954c1994
GS
466/*
467=for apidoc mg_copy
468
fbe13c60 469Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
470
471=cut
472*/
473
79072805 474int
864dbfa3 475Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 476{
463ee0b2 477 int count = 0;
79072805 478 MAGIC* mg;
7918f24d
NC
479
480 PERL_ARGS_ASSERT_MG_COPY;
481
463ee0b2 482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 483 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 486 }
823a54a3
AL
487 else {
488 const char type = mg->mg_type;
1e73acc8 489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
490 sv_magic(nsv,
491 (type == PERL_MAGIC_tied)
492 ? SvTIED_obj(sv, mg)
27deb0cf 493 : mg->mg_obj,
823a54a3
AL
494 toLOWER(type), key, klen);
495 count++;
496 }
79072805 497 }
79072805 498 }
463ee0b2 499 return count;
79072805
LW
500}
501
954c1994 502/*
0cbee0a4
DM
503=for apidoc mg_localize
504
9711599e 505Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW
506SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507gets copied, value magic doesn't (I<e.g.>,
796b6530 508C<taint>, C<pos>).
9711599e 509
796b6530 510If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 511This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 512and that will handle the magic.
0cbee0a4
DM
513
514=cut
515*/
516
517void
af7df257 518Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
519{
520 MAGIC *mg;
7918f24d
NC
521
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
523
658a9f31
JD
524 if (nsv == DEFSV)
525 return;
526
0cbee0a4 527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 528 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 530 continue;
0cbee0a4 531
a5063e7c 532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 533 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 534 else
0cbee0a4
DM
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
a5063e7c 537
0cbee0a4 538 /* container types should remain read-only across localization */
9ff3e6d8 539 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
540 }
541
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 544 if (setmagic) {
9711599e
CS
545 PL_localizing = 1;
546 SvSETMAGIC(nsv);
547 PL_localizing = 0;
548 }
0cbee0a4
DM
549 }
550}
551
d9088386
Z
552#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
553static void
554S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
555{
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
44955e7d
DM
559
560 if (mg->mg_type == PERL_MAGIC_collxfrm && mg->mg_len >= 0)
561 /* collate magic uses string len not buffer len, so
562 * free even with mg_len == 0 */
563 Safefree(mg->mg_ptr);
564 else if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
d9088386
Z
565 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
566 Safefree(mg->mg_ptr);
567 else if (mg->mg_len == HEf_SVKEY)
568 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
569 }
44955e7d 570
d9088386
Z
571 if (mg->mg_flags & MGf_REFCOUNTED)
572 SvREFCNT_dec(mg->mg_obj);
573 Safefree(mg);
574}
575
0cbee0a4 576/*
954c1994
GS
577=for apidoc mg_free
578
fbe13c60 579Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
580
581=cut
582*/
583
79072805 584int
864dbfa3 585Perl_mg_free(pTHX_ SV *sv)
79072805
LW
586{
587 MAGIC* mg;
588 MAGIC* moremagic;
7918f24d
NC
589
590 PERL_ARGS_ASSERT_MG_FREE;
591
79072805 592 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 593 moremagic = mg->mg_moremagic;
d9088386 594 mg_free_struct(sv, mg);
c826f41b 595 SvMAGIC_set(sv, moremagic);
79072805 596 }
b162af07 597 SvMAGIC_set(sv, NULL);
68f8932e 598 SvMAGICAL_off(sv);
79072805
LW
599 return 0;
600}
601
d9088386
Z
602/*
603=for apidoc Am|void|mg_free_type|SV *sv|int how
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
Z
853/*
854=for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
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 */
3280af22 1035 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 1036 break;
9ebf26ad
FR
1037 case '\007': /* ^GLOBAL_PHASE */
1038 if (strEQ(remaining, "LOBAL_PHASE")) {
1039 sv_setpvn(sv, PL_phase_names[PL_phase],
1040 strlen(PL_phase_names[PL_phase]));
1041 }
1042 break;
a0d0e21e 1043 case '\010': /* ^H */
5d382c25 1044 sv_setuv(sv, PL_hints);
a0d0e21e 1045 break;
9d116dd7 1046 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1047 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1048 break;
8561ea1d
FC
1049 case '\014': /* ^LAST_FH */
1050 if (strEQ(remaining, "AST_FH")) {
745e740c 1051 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1052 assert(isGV_with_GP(PL_last_in_gv));
1053 SV_CHECK_THINKFIRST_COW_DROP(sv);
1054 prepare_SV_for_RV(sv);
1055 SvOK_off(sv);
1056 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1057 SvROK_on(sv);
1058 sv_rvweaken(sv);
1059 }
3773545d
DM
1060 else
1061 sv_set_undef(sv);
8561ea1d
FC
1062 }
1063 break;
ac27b0f5 1064 case '\017': /* ^O & ^OPEN */
823a54a3 1065 if (nextchar == '\0') {
ac27b0f5 1066 sv_setpv(sv, PL_osname);
3511154c
DM
1067 SvTAINTED_off(sv);
1068 }
823a54a3 1069 else if (strEQ(remaining, "PEN")) {
8b850bd5 1070 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1071 }
28f23441 1072 break;
9ebf26ad 1073 case '\020':
a6d0b1b5 1074 sv_setiv(sv, (IV)PL_perldb);
79072805 1075 break;
fb73857a 1076 case '\023': /* ^S */
f512d242 1077 if (nextchar == '\0') {
bc177e6b 1078 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1079 SvOK_off(sv);
3280af22 1080 else if (PL_in_eval)
6dc8a9e4 1081 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1082 else
1083 sv_setiv(sv, 0);
d58bf5aa 1084 }
f512d242
KW
1085 else if (strEQ(remaining, "AFE_LOCALES")) {
1086
1087#if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1088
1089 sv_setuv(sv, (UV) 1);
1090
1091#else
1092 sv_setuv(sv, (UV) 0);
1093
1094#endif
1095
1096 }
fb73857a 1097 break;
79072805 1098 case '\024': /* ^T */
823a54a3 1099 if (nextchar == '\0') {
88e89b8a 1100#ifdef BIG_TIME
7c36658b 1101 sv_setnv(sv, PL_basetime);
88e89b8a 1102#else
7c36658b 1103 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1104#endif
7c36658b 1105 }
823a54a3 1106 else if (strEQ(remaining, "AINT"))
284167a5
SM
1107 sv_setiv(sv, TAINTING_get
1108 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1109 : 0);
7c36658b 1110 break;
e07ea26a 1111 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1112 if (strEQ(remaining, "NICODE"))
a05d7ebb 1113 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1114 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1115 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1116 else if (strEQ(remaining, "TF8CACHE"))
1117 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1118 break;
1119 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1120 if (nextchar == '\0')
8298454c 1121 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1122 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1123 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1124 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1125 }
1126 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1127 goto set_undef;
013b78e8 1128 }
d3a7d8c7 1129 else if (PL_compiling.cop_warnings == pWARN_ALL) {
006c1a1d 1130 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1131 }
4438c4b7 1132 else {
72dc9ed5
NC
1133 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1134 *PL_compiling.cop_warnings);
ac27b0f5 1135 }
4438c4b7 1136 }
8ca2a5d6
DD
1137#ifdef WIN32
1138 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1139 sv_setiv(sv, w32_sloppystat);
1140 }
1141#endif
79072805 1142 break;
79072805 1143 case '+':
aaa362c4 1144 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1145 paren = RX_LASTPAREN(rx);
1146 if (paren)
1147 goto do_numbuf_fetch;
79072805 1148 }
e03e82a0 1149 goto set_undef;
a01268b5
JH
1150 case '\016': /* ^N */
1151 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1152 paren = RX_LASTCLOSEPAREN(rx);
1153 if (paren)
1154 goto do_numbuf_fetch;
a01268b5 1155 }
e03e82a0 1156 goto set_undef;
79072805 1157 case '.':
3280af22 1158 if (GvIO(PL_last_in_gv)) {
357c8808 1159 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1160 }
79072805
LW
1161 break;
1162 case '?':
809a5acc 1163 {
809a5acc 1164 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1165#ifdef COMPLEX_STATUS
41cb7b2b 1166 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1167 LvTARGOFF(sv) = PL_statusvalue;
1168 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1169#endif
809a5acc 1170 }
79072805
LW
1171 break;
1172 case '^':
acbe1b9d 1173 if (GvIOp(PL_defoutgv))
099be4f1 1174 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1175 if (s)
1176 sv_setpv(sv,s);
1177 else {
3280af22 1178 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1179 sv_catpvs(sv,"_TOP");
79072805
LW
1180 }
1181 break;
1182 case '~':
acbe1b9d 1183 if (GvIOp(PL_defoutgv))
0daa599b 1184 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1185 if (!s)
3280af22 1186 s = GvENAME(PL_defoutgv);
79072805
LW
1187 sv_setpv(sv,s);
1188 break;
79072805 1189 case '=':
099be4f1 1190 if (GvIO(PL_defoutgv))
0daa599b 1191 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1192 break;
1193 case '-':
099be4f1 1194 if (GvIO(PL_defoutgv))
0daa599b 1195 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1196 break;
1197 case '%':
099be4f1 1198 if (GvIO(PL_defoutgv))
0daa599b 1199 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1200 break;
79072805 1201 case ':':
79072805
LW
1202 case '/':
1203 break;
1204 case '[':
e1dccc0d 1205 sv_setiv(sv, 0);
79072805
LW
1206 break;
1207 case '|':
099be4f1 1208 if (GvIO(PL_defoutgv))
0daa599b 1209 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1210 break;
79072805 1211 case '\\':
b2ce0fda 1212 if (PL_ors_sv)
f28098ff 1213 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1214 else
e03e82a0 1215 goto set_undef;
79072805 1216 break;
0e219455 1217 case '$': /* $$ */
9cdac2a2
FC
1218 {
1219 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1220 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1221 /* never set manually, or at least not since last fork */
1222 sv_setiv(sv, pid);
19db9fb7
Z
1223 /* never unsafe, even if reading in a tainted expression */
1224 SvTAINTED_off(sv);
1225 }
9cdac2a2
FC
1226 /* else a value has been assigned manually, so do nothing */
1227 }
0e219455 1228 break;
79072805 1229 case '<':
dfff4baf 1230 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1231 break;
1232 case '>':
dfff4baf 1233 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1234 break;
1235 case '(':
dfff4baf 1236 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1237 goto add_groups;
1238 case ')':
dfff4baf 1239 sv_setgid(sv, PerlProc_getegid());
79072805 1240 add_groups:
79072805 1241#ifdef HAS_GETGROUPS
79072805 1242 {
57d7c65e 1243 Groups_t *gary = NULL;
375ed12a
JH
1244 I32 num_groups = getgroups(0, gary);
1245 if (num_groups > 0) {
19742f39 1246 I32 i;
375ed12a
JH
1247 Newx(gary, num_groups, Groups_t);
1248 num_groups = getgroups(num_groups, gary);
1249 for (i = 0; i < num_groups; i++)
147e3846 1250 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1251 Safefree(gary);
1252 }
79072805 1253 }
155aba94 1254 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1255#endif
79072805 1256 break;
79072805
LW
1257 case '0':
1258 break;
1259 }
a0d0e21e 1260 return 0;
e03e82a0
DM
1261
1262 set_undef:
1263 sv_set_undef(sv);
1264 return 0;
79072805
LW
1265}
1266
1267int
864dbfa3 1268Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1269{
8772537c 1270 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1271
7918f24d
NC
1272 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1273
79072805 1274 if (uf && uf->uf_val)
24f81a43 1275 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1276 return 0;
1277}
1278
1279int
864dbfa3 1280Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1281{
9ae3433d 1282 STRLEN len = 0, klen;
12033064 1283 const char * const key = MgPV_const(mg,klen);
888a67f6 1284 const char *s = "";
1e422769 1285
7918f24d
NC
1286 PERL_ARGS_ASSERT_MAGIC_SETENV;
1287
613c63b4 1288 SvGETMAGIC(sv);
12033064 1289 if (SvOK(sv)) {
613c63b4
CS
1290 /* defined environment variables are byte strings; unfortunately
1291 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1292 (void)SvPV_force_nomg_nolen(sv);
1293 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1294 if (SvUTF8(sv)) {
1295 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1296 SvUTF8_off(sv);
1297 }
1298 s = SvPVX(sv);
1299 len = SvCUR(sv);
12033064
CS
1300 }
1301 my_setenv(key, s); /* does the deed */
1302
a0d0e21e
LW
1303#ifdef DYNAMIC_ENV_FETCH
1304 /* We just undefd an environment var. Is a replacement */
1305 /* waiting in the wings? */
1306 if (!len) {
6bd66ee9 1307 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1308 if (valp)
4ab59fcc 1309 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1310 }
1311#endif
1e422769 1312
28542d8f 1313#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1314 /* And you'll never guess what the dog had */
1315 /* in its mouth... */
284167a5 1316 if (TAINTING_get) {
1e422769
PP
1317 MgTAINTEDDIR_off(mg);
1318#ifdef VMS
b2aed775 1319 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1320 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1321 int i = 0, j = 0;
1322
6fca0082 1323 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1324 elt = eltbuf;
1e422769
PP
1325 do { /* DCL$PATH may be a search list */
1326 while (1) { /* as may dev portion of any element */
1327 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1328 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1329 cando_by_name(S_IWUSR,0,elt) ) {
1330 MgTAINTEDDIR_on(mg);
1331 return 0;
1332 }
1333 }
bd61b366 1334 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1335 *cp = '\0';
1336 if (my_trnlnm(elt, eltbuf, j++))
1337 elt = eltbuf;
1338 else
1339 break;
1340 }
1341 j = 0;
1342 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1343 }
1344#endif /* VMS */
b2aed775 1345 if (s && memEQs(key, klen, "PATH")) {
8772537c 1346 const char * const strend = s + len;
463ee0b2 1347
70b484a8
DM
1348 /* set MGf_TAINTEDDIR if any component of the new path is
1349 * relative or world-writeable */
463ee0b2 1350 while (s < strend) {
96827780 1351 char tmpbuf[256];
c623ac67 1352 Stat_t st;
5f74f29c 1353 I32 i;
83269ced
CB
1354#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1355 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1356#else
1357 const char path_sep = ':';
1358#endif
ba0a4150 1359 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1360 s, strend, path_sep, &i);
463ee0b2 1361 s++;
bb7a0f54 1362 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1363#ifdef __VMS
1364 /* no colon thus no device name -- assume relative path */
1365 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1366 /* Using Unix separator, e.g. under bash, so act line Unix */
1367 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1368#else
1369 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1370#endif
c6ed36e1 1371 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1372 MgTAINTEDDIR_on(mg);
1e422769
PP
1373 return 0;
1374 }
463ee0b2 1375 }
79072805
LW
1376 }
1377 }
28542d8f 1378#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1379
79072805
LW
1380 return 0;
1381}
1382
1383int
864dbfa3 1384Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1385{
7918f24d 1386 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1387 PERL_UNUSED_ARG(sv);
bd61b366 1388 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1389 return 0;
1390}
1391
88e89b8a 1392int
864dbfa3 1393Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1394{
7918f24d 1395 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1396 PERL_UNUSED_ARG(mg);
b0269e46 1397#if defined(VMS)
cea2e8a9 1398 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1399#else
3280af22 1400 if (PL_localizing) {
fb73857a 1401 HE* entry;
b0269e46 1402 my_clearenv();
85fbaab2
NC
1403 hv_iterinit(MUTABLE_HV(sv));
1404 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1405 I32 keylen;
1406 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1407 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1408 }
1409 }
1410#endif
1411 return 0;
1412}
1413
1414int
864dbfa3 1415Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1416{
7918f24d 1417 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1418 PERL_UNUSED_ARG(sv);
1419 PERL_UNUSED_ARG(mg);
b0269e46
AB
1420#if defined(VMS)
1421 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1422#else
1423 my_clearenv();
1424#endif
3e3baf6d 1425 return 0;
66b1d557
HM
1426}
1427
64ca3a65 1428#ifndef PERL_MICRO
2d4fcd5e
AJ
1429#ifdef HAS_SIGPROCMASK
1430static void
1431restore_sigmask(pTHX_ SV *save_sv)
1432{
0bd48802 1433 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1434 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1435}
1436#endif
66b1d557 1437int
864dbfa3 1438Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1439{
88e89b8a 1440 /* Are we fetching a signal entry? */
708854f2 1441 int i = (I16)mg->mg_private;
7918f24d
NC
1442
1443 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1444
708854f2 1445 if (!i) {
84c7b88c
BF
1446 STRLEN siglen;
1447 const char * sig = MgPV_const(mg, siglen);
1448 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1449 }
1450
e02bfb16 1451 if (i > 0) {
22c35a8c
GS
1452 if(PL_psig_ptr[i])
1453 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1454 else {
46da273f 1455 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1456#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1457 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1458 sigstate = SIG_IGN;
2e34cc90
CL
1459#endif
1460#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1461 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1462 sigstate = SIG_DFL;
85b332e2 1463#endif
88e89b8a 1464 /* cache state so we don't fetch it again */
8aad04aa 1465 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1466 sv_setpvs(sv,"IGNORE");
88e89b8a 1467 else
e03e82a0 1468 sv_set_undef(sv);
46da273f 1469 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1470 SvTEMP_off(sv);
1471 }
1472 }
1473 return 0;
1474}
1475int
864dbfa3 1476Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1477{
7918f24d 1478 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1479
38a124f0 1480 magic_setsig(NULL, mg);
179c85a2 1481 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1482}
3d37d572 1483
0a8e0eff 1484Signal_t
8aad04aa 1485#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1486Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1487#else
0a8e0eff 1488Perl_csighandler(int sig)
8aad04aa 1489#endif
0a8e0eff 1490{
1018e26f
NIS
1491#ifdef PERL_GET_SIG_CONTEXT
1492 dTHXa(PERL_GET_SIG_CONTEXT);
1493#else
85b332e2
CL
1494 dTHX;
1495#endif
1271a1be 1496#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1497#if defined(__cplusplus) && defined(__GNUC__)
1498 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1499 * parameters would be warned about. */
1500 PERL_UNUSED_ARG(sip);
1501 PERL_UNUSED_ARG(uap);
1502#endif
1271a1be 1503#endif
23ada85b 1504#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1505 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1506 if (PL_sig_ignoring[sig]) return;
85b332e2 1507#endif
2e34cc90 1508#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1509 if (PL_sig_defaulting[sig])
2e34cc90
CL
1510#ifdef KILL_BY_SIGPRC
1511 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1512#else
1513 exit(1);
1514#endif
1515#endif
406878dd 1516 if (
853d2c32
RGS
1517#ifdef SIGILL
1518 sig == SIGILL ||
1519#endif
1520#ifdef SIGBUS
1521 sig == SIGBUS ||
1522#endif
1523#ifdef SIGSEGV
1524 sig == SIGSEGV ||
1525#endif
1526 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1527 /* Call the perl level handler now--
31c91b43 1528 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1529#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1530 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1531#else
1532 (*PL_sighandlerp)(sig);
92807b6d 1533#endif
406878dd 1534 else {
31c91b43 1535 if (!PL_psig_pend) return;
406878dd
GA
1536 /* Set a flag to say this signal is pending, that is awaiting delivery after
1537 * the current Perl opcode completes */
1538 PL_psig_pend[sig]++;
1539
1540#ifndef SIG_PENDING_DIE_COUNT
1541# define SIG_PENDING_DIE_COUNT 120
1542#endif
fe13d51d 1543 /* Add one to say _a_ signal is pending */
406878dd
GA
1544 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1545 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1546 (unsigned long)SIG_PENDING_DIE_COUNT);
1547 }
0a8e0eff
NIS
1548}
1549
2e34cc90
CL
1550#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1551void
1552Perl_csighandler_init(void)
1553{
1554 int sig;
27da23d5 1555 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1556
1557 for (sig = 1; sig < SIG_SIZE; sig++) {
1558#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1559 dTHX;
27da23d5 1560 PL_sig_defaulting[sig] = 1;
5c1546dc 1561 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1562#endif
1563#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1564 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1565#endif
1566 }
27da23d5 1567 PL_sig_handlers_initted = 1;
2e34cc90
CL
1568}
1569#endif
1570
7fe50b8b
LT
1571#if defined HAS_SIGPROCMASK
1572static void
1573unblock_sigmask(pTHX_ void* newset)
1574{
dc3bf405 1575 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1576 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1577}
1578#endif
1579
0a8e0eff
NIS
1580void
1581Perl_despatch_signals(pTHX)
1582{
1583 int sig;
1584 PL_sig_pending = 0;
1585 for (sig = 1; sig < SIG_SIZE; sig++) {
1586 if (PL_psig_pend[sig]) {
d0166017 1587 dSAVE_ERRNO;
7fe50b8b 1588#ifdef HAS_SIGPROCMASK
55534442
LT
1589 /* From sigaction(2) (FreeBSD man page):
1590 * | Signal routines normally execute with the signal that
1591 * | caused their invocation blocked, but other signals may
1592 * | yet occur.
1593 * Emulation of this behavior (from within Perl) is enabled
1594 * using sigprocmask
1595 */
1596 int was_blocked;
1597 sigset_t newset, oldset;
1598
1599 sigemptyset(&newset);
1600 sigaddset(&newset, sig);
1601 sigprocmask(SIG_BLOCK, &newset, &oldset);
1602 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1603 if (!was_blocked) {
1604 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1605 ENTER;
1606 SAVEFREESV(save_sv);
1607 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1608 }
55534442 1609#endif
25da4428 1610 PL_psig_pend[sig] = 0;
6e324d09 1611#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1612 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1613#else
1614 (*PL_sighandlerp)(sig);
92807b6d 1615#endif
7fe50b8b 1616#ifdef HAS_SIGPROCMASK
55534442 1617 if (!was_blocked)
7fe50b8b 1618 LEAVE;
55534442 1619#endif
d0166017 1620 RESTORE_ERRNO;
0a8e0eff
NIS
1621 }
1622 }
1623}
1624
38a124f0 1625/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1626int
864dbfa3 1627Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1628{
27da23d5 1629 dVAR;
79072805 1630 I32 i;
cbbf8932 1631 SV** svp = NULL;
2d4fcd5e
AJ
1632 /* Need to be careful with SvREFCNT_dec(), because that can have side
1633 * effects (due to closures). We must make sure that the new disposition
1634 * is in place before it is called.
1635 */
cbbf8932 1636 SV* to_dec = NULL;
e72dc28c 1637 STRLEN len;
2d4fcd5e
AJ
1638#ifdef HAS_SIGPROCMASK
1639 sigset_t set, save;
1640 SV* save_sv;
1641#endif
eb578fdb 1642 const char *s = MgPV_const(mg,len);
7918f24d
NC
1643
1644 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1645
748a9306 1646 if (*s == '_') {
84c7b88c 1647 if (memEQs(s, len, "__DIE__"))
3280af22 1648 svp = &PL_diehook;
84c7b88c 1649 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1650 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1651 /* Merge the existing behaviours, which are as follows:
1652 magic_setsig, we always set svp to &PL_warnhook
1653 (hence we always change the warnings handler)
1654 For magic_clearsig, we don't change the warnings handler if it's
1655 set to the &PL_warnhook. */
3280af22 1656 svp = &PL_warnhook;
84c7b88c
BF
1657 } else if (sv) {
1658 SV *tmp = sv_newmortal();
1659 Perl_croak(aTHX_ "No such hook: %s",
1660 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1661 }
748a9306 1662 i = 0;
38a124f0 1663 if (svp && *svp) {
9289f461
RGS
1664 if (*svp != PERL_WARNHOOK_FATAL)
1665 to_dec = *svp;
cbbf8932 1666 *svp = NULL;
4633a7c4 1667 }
748a9306
LW
1668 }
1669 else {
708854f2
NC
1670 i = (I16)mg->mg_private;
1671 if (!i) {
84c7b88c 1672 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1673 mg->mg_private = (U16)i;
708854f2 1674 }
86d86cad 1675 if (i <= 0) {
84c7b88c
BF
1676 if (sv) {
1677 SV *tmp = sv_newmortal();
1678 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1679 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1680 }
748a9306
LW
1681 return 0;
1682 }
2d4fcd5e
AJ
1683#ifdef HAS_SIGPROCMASK
1684 /* Avoid having the signal arrive at a bad time, if possible. */
1685 sigemptyset(&set);
1686 sigaddset(&set,i);
1687 sigprocmask(SIG_BLOCK, &set, &save);
1688 ENTER;
9ff8e806 1689 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1690 SAVEFREESV(save_sv);
1691 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1692#endif
1693 PERL_ASYNC_CHECK();
2e34cc90 1694#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1695 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1696#endif
23ada85b 1697#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1698 PL_sig_ignoring[i] = 0;
85b332e2 1699#endif
2e34cc90 1700#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1701 PL_sig_defaulting[i] = 0;
2e34cc90 1702#endif
2d4fcd5e 1703 to_dec = PL_psig_ptr[i];
38a124f0
NC
1704 if (sv) {
1705 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1706 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1707
1708 /* Signals don't change name during the program's execution, so once
1709 they're cached in the appropriate slot of PL_psig_name, they can
1710 stay there.
1711
1712 Ideally we'd find some way of making SVs at (C) compile time, or
1713 at least, doing most of the work. */
1714 if (!PL_psig_name[i]) {
1715 PL_psig_name[i] = newSVpvn(s, len);
1716 SvREADONLY_on(PL_psig_name[i]);
1717 }
38a124f0 1718 } else {
79fd3822 1719 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1720 PL_psig_name[i] = NULL;
1721 PL_psig_ptr[i] = NULL;
1722 }
748a9306 1723 }
38a124f0 1724 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1725 if (i) {
5c1546dc 1726 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1727 }
748a9306 1728 else
b37c2d43 1729 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1730 } else {
9dfa190b
NC
1731 if (sv && SvOK(sv)) {
1732 s = SvPV_force(sv, len);
1733 } else {
1734 sv = NULL;
1735 }
84c7b88c 1736 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1737 if (i) {
23ada85b 1738#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1739 PL_sig_ignoring[i] = 1;
1740 (void)rsignal(i, PL_csighandlerp);
85b332e2 1741#else
9dfa190b 1742 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1743#endif
9dfa190b 1744 }
2d4fcd5e 1745 }
84c7b88c 1746 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1747 if (i) {
2e34cc90 1748#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1749 PL_sig_defaulting[i] = 1;
1750 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1751#else
9dfa190b 1752 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1753#endif
9dfa190b
NC
1754 }
1755 }
1756 else {
1757 /*
1758 * We should warn if HINT_STRICT_REFS, but without
1759 * access to a known hint bit in a known OP, we can't
1760 * tell whether HINT_STRICT_REFS is in force or not.
1761 */
0687887e 1762 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1763 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1764 SV_GMAGIC);
1765 if (i)
1766 (void)rsignal(i, PL_csighandlerp);
1767 else
1768 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1769 }
748a9306 1770 }
9dfa190b 1771
2d4fcd5e
AJ
1772#ifdef HAS_SIGPROCMASK
1773 if(i)
1774 LEAVE;
1775#endif
ef8d46e8 1776 SvREFCNT_dec(to_dec);
79072805
LW
1777 return 0;
1778}
64ca3a65 1779#endif /* !PERL_MICRO */
79072805
LW
1780
1781int
864dbfa3 1782Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1783{
7918f24d 1784 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1785 PERL_UNUSED_ARG(sv);
e1a479c5 1786
89c14e2e 1787 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1788 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1789 return 0;
1790
0e446081 1791 return magic_clearisa(NULL, mg);
463ee0b2
LW
1792}
1793
0e446081 1794/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1795int
52b45067
RD
1796Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1797{
52b45067 1798 HV* stash;
7918f24d
NC
1799 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1800
52b45067 1801 /* Bail out if destruction is going on */
627364f1 1802 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1803
0e446081
NC
1804 if (sv)
1805 av_clear(MUTABLE_AV(sv));
52b45067 1806
6624142a
FC
1807 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1808 /* This occurs with setisa_elem magic, which calls this
1809 same function. */
1810 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1811
316ebaf2 1812 assert(mg);
6624142a
FC
1813 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1814 SV **svp = AvARRAY((AV *)mg->mg_obj);
1815 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1816 while (items--) {
1817 stash = GvSTASH((GV *)*svp++);
1818 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1819 }
1820
1821 return 0;
1822 }
1823
52b45067 1824 stash = GvSTASH(
6624142a 1825 (const GV *)mg->mg_obj
52b45067
RD
1826 );
1827
00169e2c
FC
1828 /* The stash may have been detached from the symbol table, so check its
1829 name before doing anything. */
1830 if (stash && HvENAME_get(stash))
5562fa71 1831 mro_isa_changed_in(stash);
52b45067
RD
1832
1833 return 0;
1834}
1835
1836int
864dbfa3 1837Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1838{
85fbaab2 1839 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1840 I32 i = 0;
7918f24d
NC
1841
1842 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1843 PERL_UNUSED_ARG(mg);
7719e241 1844
6ff81951 1845 if (hv) {
497b47a8 1846 (void) hv_iterinit(hv);
ad64d0ec 1847 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1848 i = HvUSEDKEYS(hv);
497b47a8
JH
1849 else {
1850 while (hv_iternext(hv))
1851 i++;
1852 }
6ff81951
GS
1853 }
1854
1855 sv_setiv(sv, (IV)i);
1856 return 0;
1857}
1858
1859int
864dbfa3 1860Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1861{
7918f24d 1862 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1863 PERL_UNUSED_ARG(mg);
946ec16e 1864 if (LvTARG(sv)) {
85fbaab2 1865 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1866 }
1867 return 0;
ac27b0f5 1868}
946ec16e 1869
efaf3674
DM
1870/*
1871=for apidoc magic_methcall
1872
1873Invoke a magic method (like FETCH).
1874
2baee27b
FC
1875C<sv> and C<mg> are the tied thingy and the tie magic.
1876
1877C<meth> is the name of the method to call.
1878
1879C<argc> is the number of args (in addition to $self) to pass to the method.
1880
1881The C<flags> can be:
1882
1883 G_DISCARD invoke method with G_DISCARD flag and don't
1884 return a value
1885 G_UNDEF_FILL fill the stack with argc pointers to
1886 PL_sv_undef
1887
1888The arguments themselves are any values following the C<flags> argument.
efaf3674 1889
796b6530 1890Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1891
1892
1893=cut
1894*/
1895
1896SV*
36925d9e 1897Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1898 U32 argc, ...)
a0d0e21e
LW
1899{
1900 dSP;
efaf3674 1901 SV* ret = NULL;
463ee0b2 1902
7918f24d
NC
1903 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1904
efaf3674 1905 ENTER;
d1d7a15d
NC
1906
1907 if (flags & G_WRITING_TO_STDERR) {
1908 SAVETMPS;
1909
2782061f 1910 save_re_context();
d1d7a15d
NC
1911 SAVESPTR(PL_stderrgv);
1912 PL_stderrgv = NULL;
1913 }
1914
efaf3674 1915 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1916 PUSHMARK(SP);
efaf3674 1917
052a7c76
DM
1918 /* EXTEND() expects a signed argc; don't wrap when casting */
1919 assert(argc <= I32_MAX);
1920 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1921 PUSHs(SvTIED_obj(sv, mg));
1922 if (flags & G_UNDEF_FILL) {
1923 while (argc--) {
efaf3674 1924 PUSHs(&PL_sv_undef);
93965878 1925 }
67549bd2 1926 } else if (argc > 0) {
046b0c7d
NC
1927 va_list args;
1928 va_start(args, argc);
1929
1930 do {
1931 SV *const sv = va_arg(args, SV *);
1932 PUSHs(sv);
1933 } while (--argc);
1934
1935 va_end(args);
88e89b8a 1936 }
463ee0b2 1937 PUTBACK;
efaf3674 1938 if (flags & G_DISCARD) {
36925d9e 1939 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1940 }
1941 else {
36925d9e 1942 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1943 ret = *PL_stack_sp--;
1944 }
1945 POPSTACK;
d1d7a15d
NC
1946 if (flags & G_WRITING_TO_STDERR)
1947 FREETMPS;
efaf3674
DM
1948 LEAVE;
1949 return ret;
1950}
1951
efaf3674 1952/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1953
efaf3674 1954STATIC SV*
36925d9e 1955S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1956 int n, SV *val)
1957{
efaf3674
DM
1958 SV* arg1 = NULL;
1959
1960 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1961
1962 if (mg->mg_ptr) {
1963 if (mg->mg_len >= 0) {
db4b3a1d 1964 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1965 }
1966 else if (mg->mg_len == HEf_SVKEY)
1967 arg1 = MUTABLE_SV(mg->mg_ptr);
1968 }
1969 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1970 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1971 sv_2mortal(arg1);
1972 }
1973 if (!arg1) {
046b0c7d 1974 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1975 }
046b0c7d 1976 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1977}
1978
76e3520e 1979STATIC int
36925d9e 1980S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1981{
efaf3674 1982 SV* ret;
463ee0b2 1983
7918f24d
NC
1984 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1985
efaf3674
DM
1986 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1987 if (ret)
1988 sv_setsv(sv, ret);
a0d0e21e
LW
1989 return 0;
1990}
463ee0b2 1991
a0d0e21e 1992int
864dbfa3 1993Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1994{
7918f24d
NC
1995 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1996
fd69380d 1997 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1998 mg->mg_flags |= MGf_GSKIP;
36925d9e 1999 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
2000 return 0;
2001}
2002
2003int
864dbfa3 2004Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 2005{
b112cff9
DM
2006 MAGIC *tmg;
2007 SV *val;
7918f24d
NC
2008
2009 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2010
b112cff9
DM
2011 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2012 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2013 * public flags indicate its value based on copying from $val. Doing
2014 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2015 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2016 * wrong if $val happened to be tainted, as sv hasn't got magic
2017 * enabled, even though taint magic is in the chain. In which case,
2018 * fake up a temporary tainted value (this is easier than temporarily
2019 * re-enabling magic on sv). */
2020
284167a5 2021 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2022 && (tmg->mg_len & 1))
2023 {
2024 val = sv_mortalcopy(sv);
2025 SvTAINTED_on(val);
2026 }
2027 else
2028 val = sv;
2029
36925d9e 2030 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2031 return 0;
2032}
2033
2034int
864dbfa3 2035Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2036{
7918f24d
NC
2037 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2038
4c13be3f 2039 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2040 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2041}
463ee0b2 2042
93965878
NIS
2043
2044U32
864dbfa3 2045Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2046{
22846ab4 2047 I32 retval = 0;
efaf3674 2048 SV* retsv;
93965878 2049
7918f24d
NC
2050 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2051
36925d9e 2052 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2053 if (retsv) {
2054 retval = SvIV(retsv)-1;
22846ab4
AB
2055 if (retval < -1)
2056 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2057 }
22846ab4 2058 return (U32) retval;
93965878
NIS
2059}
2060
cea2e8a9
GS
2061int
2062Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2063{
7918f24d
NC
2064 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2065
36925d9e 2066 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2067 return 0;
2068}
2069
2070int
864dbfa3 2071Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2072{
efaf3674 2073 SV* ret;
463ee0b2 2074
7918f24d
NC
2075 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2076
36925d9e
RZ
2077 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2078 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2079 if (ret)
2080 sv_setsv(key,ret);
79072805
LW
2081 return 0;
2082}
2083
2084int
1146e912 2085Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2086{
7918f24d
NC
2087 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2088
36925d9e 2089 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2090}
a0d0e21e 2091
a3bcc51e
TP
2092SV *
2093Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2094{
5fcbf73d 2095 SV *retval;
ad64d0ec
NC
2096 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2097 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2098
7918f24d
NC
2099 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2100
a3bcc51e
TP
2101 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2102 SV *key;
bfcb3514 2103 if (HvEITER_get(hv))
a3bcc51e
TP
2104 /* we are in an iteration so the hash cannot be empty */
2105 return &PL_sv_yes;
2106 /* no xhv_eiter so now use FIRSTKEY */
2107 key = sv_newmortal();
ad64d0ec 2108 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2109 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2110 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2111 }
2112
2113 /* there is a SCALAR method that we can call */
36925d9e 2114 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2115 if (!retval)
5fcbf73d 2116 retval = &PL_sv_undef;
a3bcc51e
TP
2117 return retval;
2118}
2119
a0d0e21e 2120int
864dbfa3 2121Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2122{
089b5c60 2123 SV **svp;
7918f24d
NC
2124
2125 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2126
089b5c60
NC
2127 /* The magic ptr/len for the debugger's hash should always be an SV. */
2128 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2129 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2130 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2131 }
2132
2133 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2134 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2135 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2136 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2137
8772537c 2138 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2139 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2140 if (o) {
2141#ifdef PERL_DEBUG_READONLY_OPS
2142 Slab_to_rw(OpSLAB(o));
2143#endif
2144 /* set or clear breakpoint in the relevant control op */
089b5c60 2145 if (SvTRUE(sv))
88df5f01 2146 o->op_flags |= OPf_SPECIAL;
8772537c 2147 else
88df5f01
FC
2148 o->op_flags &= ~OPf_SPECIAL;
2149#ifdef PERL_DEBUG_READONLY_OPS
2150 Slab_to_ro(OpSLAB(o));
2151#endif
8772537c 2152 }
5df8de69 2153 }
79072805
LW
2154 return 0;
2155}
2156
2157int
8772537c 2158Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2159{
502c6561 2160 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2161
2162 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2163
83bf042f 2164 if (obj) {
e1dccc0d 2165 sv_setiv(sv, AvFILL(obj));
83bf042f 2166 } else {
3773545d 2167 sv_set_undef(sv);
83bf042f 2168 }
79072805
LW
2169 return 0;
2170}
2171
2172int
864dbfa3 2173Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2174{
502c6561 2175 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2176
2177 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2178
83bf042f 2179 if (obj) {
e1dccc0d 2180 av_fill(obj, SvIV(sv));
83bf042f 2181 } else {
a2a5de95
NC
2182 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2183 "Attempt to set length of freed array");
83bf042f
NC
2184 }
2185 return 0;
2186}
2187
2188int
83f29afa
VP
2189Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2190{
83f29afa
VP
2191 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2192 PERL_UNUSED_ARG(sv);
dc3bf405 2193 PERL_UNUSED_CONTEXT;
83f29afa
VP
2194
2195 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2196 if (sizeof(IV) == sizeof(SSize_t)) {
2197 *((IV *) &(mg->mg_len)) = 0;
2198 } else {
2199 if (mg->mg_ptr)
2200 *((IV *) mg->mg_ptr) = 0;
2201 }
83f29afa
VP
2202
2203 return 0;
2204}
2205
2206int
83bf042f
NC
2207Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2208{
7918f24d 2209 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2210 PERL_UNUSED_ARG(sv);
7918f24d 2211
94f3782b
DM
2212 /* during global destruction, mg_obj may already have been freed */
2213 if (PL_in_clean_all)
1ea47f64 2214 return 0;
94f3782b 2215
83bf042f
NC
2216 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2217
2218 if (mg) {
2219 /* arylen scalar holds a pointer back to the array, but doesn't own a
2220 reference. Hence the we (the array) are about to go away with it
2221 still pointing at us. Clear its pointer, else it would be pointing
2222 at free memory. See the comment in sv_magic about reference loops,
2223 and why it can't own a reference to us. */
2224 mg->mg_obj = 0;
2225 }
a0d0e21e
LW
2226 return 0;
2227}
2228
2229int
864dbfa3 2230Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2231{
16eb5365 2232 SV* const lsv = LvTARG(sv);
96c2a8ff 2233 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2234
2235 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2236 PERL_UNUSED_ARG(mg);
ac27b0f5 2237
6174b39a
FC
2238 if (found && found->mg_len != -1) {
2239 STRLEN i = found->mg_len;
25fdce4a 2240 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2241 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2242 sv_setuv(sv, i);
a0d0e21e 2243 return 0;
a0d0e21e 2244 }
3773545d 2245 sv_set_undef(sv);
a0d0e21e
LW
2246 return 0;
2247}
2248
2249int
864dbfa3 2250Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2251{
16eb5365 2252 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2253 SSize_t pos;
2254 STRLEN len;
53d44271 2255 MAGIC* found;
aec43834 2256 const char *s;
a0d0e21e 2257
7918f24d 2258 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2259 PERL_UNUSED_ARG(mg);
ac27b0f5 2260
96c2a8ff 2261 found = mg_find_mglob(lsv);
3881461a 2262 if (!found) {
a0d0e21e
LW
2263 if (!SvOK(sv))
2264 return 0;
96c2a8ff 2265 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2266 }
2267 else if (!SvOK(sv)) {
3881461a 2268 found->mg_len = -1;
a0d0e21e
LW
2269 return 0;
2270 }
aec43834 2271 s = SvPV_const(lsv, len);
a0d0e21e 2272
e1dccc0d 2273 pos = SvIV(sv);
a0ed51b3 2274
7e2040f0 2275 if (DO_UTF8(lsv)) {
19742f39 2276 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2277 if (ulen)
2278 len = ulen;
a0ed51b3
LW
2279 }
2280
a0d0e21e
LW
2281 if (pos < 0) {
2282 pos += len;
2283 if (pos < 0)
2284 pos = 0;
2285 }
eb160463 2286 else if (pos > (SSize_t)len)
a0d0e21e 2287 pos = len;
a0ed51b3 2288
3881461a 2289 found->mg_len = pos;
25fdce4a 2290 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2291
79072805
LW
2292 return 0;
2293}
2294
2295int
864dbfa3 2296Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2297{
2298 STRLEN len;
35a4481c 2299 SV * const lsv = LvTARG(sv);
b83604b4 2300 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2301 STRLEN offs = LvTARGOFF(sv);
2302 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2303 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2304 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2305
2306 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2307 PERL_UNUSED_ARG(mg);
6ff81951 2308
83f78d1a 2309 if (!translate_substr_offsets(
4ddea69a 2310 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2311 negoff ? -(IV)offs : (IV)offs, !negoff,
2312 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2313 )) {
2314 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2315 sv_set_undef(sv);
83f78d1a
FC
2316 return 0;
2317 }
2318
9aa983d2 2319 if (SvUTF8(lsv))
4ddea69a 2320 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2321 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2322 if (SvUTF8(lsv))
2ef4b674 2323 SvUTF8_on(sv);
6ff81951
GS
2324 return 0;
2325}
2326
2327int
864dbfa3 2328Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2329{
83f78d1a 2330 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2331 const char * const tmps = SvPV_const(sv, len);
dd374669 2332 SV * const lsv = LvTARG(sv);
777f7c56
EB
2333 STRLEN lvoff = LvTARGOFF(sv);
2334 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2335 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2336 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2337
2338 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2339 PERL_UNUSED_ARG(mg);
075a4a2b 2340
a74fb2cd
FC
2341 SvGETMAGIC(lsv);
2342 if (SvROK(lsv))
2343 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2344 "Attempt to use reference as lvalue in substr"
2345 );
fc061ed8
FC
2346 SvPV_force_nomg(lsv,lsv_len);
2347 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2348 if (!translate_substr_offsets(
2349 lsv_len,
2350 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2351 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2352 ))
2353 Perl_croak(aTHX_ "substr outside of string");
2354 oldtarglen = lvlen;
1aa99e6b 2355 if (DO_UTF8(sv)) {
73a087f0 2356 sv_utf8_upgrade_nomg(lsv);
d931b1be 2357 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2358 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2359 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2360 SvUTF8_on(lsv);
2361 }
0d336106 2362 else if (SvUTF8(lsv)) {
5fcbf73d 2363 const char *utf8;
d931b1be 2364 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2365 newtarglen = len;
5fcbf73d 2366 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2367 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2368 Safefree(utf8);
1aa99e6b 2369 }
b76f3ce2 2370 else {
a74fb2cd 2371 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2372 newtarglen = len;
b76f3ce2 2373 }
83f78d1a
FC
2374 if (!neglen) LvTARGLEN(sv) = newtarglen;
2375 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2376
79072805
LW
2377 return 0;
2378}
2379
2380int
864dbfa3 2381Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2382{
7918f24d 2383 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2384 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2385#ifdef NO_TAINT_SUPPORT
2386 PERL_UNUSED_ARG(mg);
2387#endif
7918f24d 2388
64ff300b 2389 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2390 return 0;
2391}
2392
2393int
864dbfa3 2394Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2395{
7918f24d 2396 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2397 PERL_UNUSED_ARG(sv);
7918f24d 2398
b01e650a 2399 /* update taint status */
284167a5 2400 if (TAINT_get)
b01e650a
DM
2401 mg->mg_len |= 1;
2402 else
2403 mg->mg_len &= ~1;
463ee0b2
LW
2404 return 0;
2405}
2406
2407int
864dbfa3 2408Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2409{
35a4481c 2410 SV * const lsv = LvTARG(sv);
1b92e694 2411 char errflags = LvFLAGS(sv);
7918f24d
NC
2412
2413 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2414 PERL_UNUSED_ARG(mg);
6ff81951 2415
1b92e694 2416 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2417 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2418 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2419
6ff81951
GS
2420 return 0;
2421}
2422
2423int
864dbfa3 2424Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2425{
7918f24d 2426 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2427 PERL_UNUSED_ARG(mg);
79072805
LW
2428 do_vecset(sv); /* XXX slurp this routine */
2429 return 0;
2430}
2431
13733cde
FC
2432SV *
2433Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2434{
a0714e2c 2435 SV *targ = NULL;
13733cde
FC
2436 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2437 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2438 assert(mg);
5f05dabc 2439 if (LvTARGLEN(sv)) {
68dc0745 2440 if (mg->mg_obj) {
8772537c 2441 SV * const ahv = LvTARG(sv);
85fbaab2 2442 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2443 if (he)
2444 targ = HeVAL(he);
68dc0745 2445 }
bbfdc870 2446 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2447 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2448 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2449 {
2450 if (SvRMAGICAL(av)) {
2451 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2452 targ = svp ? *svp : NULL;
2453 }
2454 else
bbfdc870 2455 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2456 }
68dc0745 2457 }
46da273f 2458 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2459 /* somebody else defined it for us */
2460 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2461 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2462 LvTARGLEN(sv) = 0;
2463 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2464 mg->mg_obj = NULL;
68dc0745
PP
2465 mg->mg_flags &= ~MGf_REFCOUNTED;
2466 }
13733cde 2467 return targ;
5f05dabc 2468 }
71be2cbc 2469 else
13733cde
FC
2470 return LvTARG(sv);
2471}
2472
2473int
2474Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2475{
2476 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2477
2478 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2479 return 0;
2480}
2481
2482int
864dbfa3 2483Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2484{
7918f24d 2485 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2486 PERL_UNUSED_ARG(mg);
71be2cbc 2487 if (LvTARGLEN(sv))
68dc0745
PP
2488 vivify_defelem(sv);
2489 if (LvTARG(sv)) {
5f05dabc 2490 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2491 SvSETMAGIC(LvTARG(sv));
2492 }
5f05dabc
PP
2493 return 0;
2494}
2495
71be2cbc 2496void
864dbfa3 2497Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2498{
74e13ce4 2499 MAGIC *mg;
a0714e2c 2500 SV *value = NULL;
71be2cbc 2501
7918f24d
NC
2502 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2503
14befaf4 2504 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2505 return;
68dc0745 2506 if (mg->mg_obj) {
8772537c 2507 SV * const ahv = LvTARG(sv);
85fbaab2 2508 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2509 if (he)
2510 value = HeVAL(he);
3280af22 2511 if (!value || value == &PL_sv_undef)
be2597df 2512 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2513 }
bbfdc870
FC
2514 else if (LvSTARGOFF(sv) < 0)
2515 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2516 else {
502c6561 2517 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2518 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2519 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2520 else {
bbfdc870 2521 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2522 if (!svp || !(value = *svp))
bbfdc870 2523 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2524 }
2525 }
b37c2d43 2526 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2527 SvREFCNT_dec(LvTARG(sv));
2528 LvTARG(sv) = value;
71be2cbc 2529 LvTARGLEN(sv) = 0;
68dc0745 2530 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2531 mg->mg_obj = NULL;
68dc0745 2532 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2533}
2534
2535int
1f1dcfb5
FC
2536Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2537{
2538 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2539 PERL_UNUSED_ARG(mg);
2540 sv_unmagic(sv, PERL_MAGIC_nonelem);
2541 return 0;
2542}
2543
2544int
864dbfa3 2545Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2546{
7918f24d 2547 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2548 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2549 return 0;
810b8aa5
GS
2550}
2551
2552int
864dbfa3 2553Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2554{
7918f24d 2555 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2556 PERL_UNUSED_CONTEXT;
0177730e 2557 PERL_UNUSED_ARG(sv);
565764a8 2558 mg->mg_len = -1;
93a17b20
LW
2559 return 0;
2560}
2561
2562int
864dbfa3 2563Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2564{
35a4481c 2565 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2566
7918f24d
NC
2567 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2568
79072805 2569 if (uf && uf->uf_set)
24f81a43 2570 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2571 return 0;
2572}
2573
c277df42 2574int
faf82a0b
AE
2575Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2576{
488344d2 2577 const char type = mg->mg_type;
7918f24d
NC
2578
2579 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2580
a5c7cb08
DM
2581 assert( type == PERL_MAGIC_fm
2582 || type == PERL_MAGIC_qr
2583 || type == PERL_MAGIC_bm);
488344d2 2584 return sv_unmagic(sv, type);
faf82a0b
AE
2585}
2586
7a4c00b4 2587#ifdef USE_LOCALE_COLLATE
79072805 2588int
864dbfa3 2589Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2590{
7918f24d
NC
2591 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2592
bbce6d69 2593 /*
838b5b74 2594 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2595 * and vanished with a faint plop.
2596 */
96a5add6 2597 PERL_UNUSED_CONTEXT;
8772537c 2598 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2599 if (mg->mg_ptr) {
2600 Safefree(mg->mg_ptr);
2601 mg->mg_ptr = NULL;
565764a8 2602 mg->mg_len = -1;
7a4c00b4 2603 }
bbce6d69
PP
2604 return 0;
2605}
7a4c00b4 2606#endif /* USE_LOCALE_COLLATE */
bbce6d69 2607
7e8c5dac
HS
2608/* Just clear the UTF-8 cache data. */
2609int
2610Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2611{
7918f24d 2612 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2613 PERL_UNUSED_CONTEXT;
8772537c 2614 PERL_UNUSED_ARG(sv);
7e8c5dac 2615 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2616 mg->mg_ptr = NULL;
7e8c5dac
HS
2617 mg->mg_len = -1; /* The mg_len holds the len cache. */
2618 return 0;
2619}
2620
bbce6d69 2621int
9cce4f9a
FC
2622Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2623{
9782ce69 2624 const char *bad = NULL;
9cce4f9a 2625 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2626 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2627 switch (mg->mg_private & OPpLVREF_TYPE) {
2628 case OPpLVREF_SV:
2629 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2630 bad = " SCALAR";
2631 break;
2632 case OPpLVREF_AV:
2633 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2634 bad = "n ARRAY";
2635 break;
2636 case OPpLVREF_HV:
2637 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2638 bad = " HASH";
2639 break;
2640 case OPpLVREF_CV:
2641 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2642 bad = " CODE";
2643 }
2644 if (bad)
26a50d99 2645 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2646 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2647 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2648 case 0:
2649 {
2650 SV * const old = PAD_SV(mg->mg_len);
2651 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2652 SvREFCNT_dec(old);
2653 break;
2654 }
2655 case SVt_PVGV:
2656 gv_setref(mg->mg_obj, sv);
2657 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2658 break;
2659 case SVt_PVAV:
2660 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2661 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2662 break;
2663 case SVt_PVHV:
7fcb36d5
JH
2664 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2665 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2666 }
d39c26a6
FC
2667 if (mg->mg_flags & MGf_PERSIST)
2668 NOOP; /* This sv is in use as an iterator var and will be reused,
2669 so we must leave the magic. */
2670 else
2671 /* This sv could be returned by the assignment op, so clear the
2672 magic, as lvrefs are an implementation detail that must not be
2673 leaked to the user. */
2674 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2675 return 0;
2676}
2677
f1540bed
JH
2678static void
2679S_set_dollarzero(pTHX_ SV *sv)
2680 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2681{
2682#ifdef USE_ITHREADS
2683 dVAR;
2684#endif
2685 const char *s;
2686 STRLEN len;
f1540bed
JH
2687#ifdef HAS_SETPROCTITLE
2688 /* The BSDs don't show the argv[] in ps(1) output, they
2689 * show a string from the process struct and provide
2690 * the setproctitle() routine to manipulate that. */
2691 if (PL_origalen != 1) {
2692 s = SvPV_const(sv, len);
38626956 2693# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2694 /* The leading "-" removes the "perl: " prefix,
2695 * but not the "(perl) suffix from the ps(1)
2696 * output, because that's what ps(1) shows if the
2697 * argv[] is modified. */
2698 setproctitle("-%s", s);
2699# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2700 /* This doesn't really work if you assume that
2701 * $0 = 'foobar'; will wipe out 'perl' from the $0
2702 * because in ps(1) output the result will be like
2703 * sprintf("perl: %s (perl)", s)
2704 * I guess this is a security feature:
2705 * one (a user process) cannot get rid of the original name.
2706 * --jhi */
2707 setproctitle("%s", s);
2708# endif
2709 }
2710#elif defined(__hpux) && defined(PSTAT_SETCMD)
2711 if (PL_origalen != 1) {
2712 union pstun un;
2713 s = SvPV_const(sv, len);
2714 un.pst_command = (char *)s;
2715 pstat(PSTAT_SETCMD, un, len, 0, 0);
2716 }
2717#else
2718 if (PL_origalen > 1) {
4f3e04fd 2719 I32 i;
f1540bed
JH
2720 /* PL_origalen is set in perl_parse(). */
2721 s = SvPV_force(sv,len);
2722 if (len >= (STRLEN)PL_origalen-1) {
2723 /* Longer than original, will be truncated. We assume that
2724 * PL_origalen bytes are available. */
2725 Copy(s, PL_origargv[0], PL_origalen-1, char);
2726 }
2727 else {
2728 /* Shorter than original, will be padded. */
2729#ifdef PERL_DARWIN
2730 /* Special case for Mac OS X: see [perl #38868] */
2731 const int pad = 0;
2732#else
2733 /* Is the space counterintuitive? Yes.
2734 * (You were expecting \0?)
2735 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2736 * --jhi */
2737 const int pad = ' ';
2738#endif
2739 Copy(s, PL_origargv[0], len, char);
2740 PL_origargv[0][len] = 0;
2741 memset(PL_origargv[0] + len + 1,
2742 pad, PL_origalen - len - 1);
2743 }
2744 PL_origargv[0][PL_origalen-1] = 0;
2745 for (i = 1; i < PL_origargc; i++)
2746 PL_origargv[i] = 0;
2747#ifdef HAS_PRCTL_SET_NAME
2748 /* Set the legacy process name in addition to the POSIX name on Linux */
2749 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2750 /* diag_listed_as: SKIPME */
2751 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2752 }
2753#endif
2754 }
2755#endif
2756}
2757
9cce4f9a 2758int
864dbfa3 2759Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2760{
20b7effb 2761#ifdef USE_ITHREADS
97aff369 2762 dVAR;
20b7effb 2763#endif
eb578fdb
KW
2764 I32 paren;
2765 const REGEXP * rx;
79072805 2766 I32 i;
8990e307 2767 STRLEN len;
125b9982 2768 MAGIC *tmg;
2fdbfb4d 2769
7918f24d
NC
2770 PERL_ARGS_ASSERT_MAGIC_SET;
2771
e91d8259 2772 if (!mg->mg_ptr) {
960b831f 2773 paren = mg->mg_len;
1e05feb3 2774 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2775 setparen_got_rx:
2fdbfb4d 2776 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2777 } else {
2fdbfb4d
AB
2778 /* Croak with a READONLY error when a numbered match var is
2779 * set without a previous pattern match. Unless it's C<local $1>
2780 */
e91d8259 2781 croakparen:
2fdbfb4d 2782 if (!PL_localizing) {
cb077ed2 2783 Perl_croak_no_modify();
2fdbfb4d
AB
2784 }
2785 }
e91d8259
NC
2786 return 0;
2787 }
2788
2789 switch (*mg->mg_ptr) {
748a9306 2790 case '\001': /* ^A */
f2da823f
FC
2791 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2792 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2793 FmLINES(PL_bodytarget) = 0;
2794 if (SvPOK(PL_bodytarget)) {
2795 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2796 char *e = SvEND(PL_bodytarget);
2797 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2798 FmLINES(PL_bodytarget)++;
2799 s++;
2800 }
2801 }
125b9982 2802 /* mg_set() has temporarily made sv non-magical */
284167a5 2803 if (TAINTING_get) {
125b9982
NT
2804 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2805 SvTAINTED_on(PL_bodytarget);
2806 else
2807 SvTAINTED_off(PL_bodytarget);
2808 }
748a9306 2809 break;
49460fe6 2810 case '\003': /* ^C */
f2338a2e 2811 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2812 break;
2813
79072805 2814 case '\004': /* ^D */
b4ab917c 2815#ifdef DEBUGGING
a9e2d2bf
DM
2816 {
2817 const char *s = SvPV_nolen_const(sv);
2818 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2819 if (DEBUG_x_TEST || DEBUG_B_TEST)
2820 dump_all_perl(!DEBUG_B_TEST);
2821 }
b4ab917c 2822#else
38ab35f8 2823 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2824#endif
79072805 2825 break;
28f23441 2826 case '\005': /* ^E */
d0063567 2827 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2828#ifdef VMS
38ab35f8 2829 set_vaxc_errno(SvIV(sv));
2abc681d 2830#elif defined(WIN32)
d0063567 2831 SetLastError( SvIV(sv) );
2abc681d 2832#elif defined(OS2)
38ab35f8 2833 os2_setsyserrno(SvIV(sv));
2abc681d 2834#else
d0063567 2835 /* will anyone ever use this? */
38ab35f8 2836 SETERRNO(SvIV(sv), 4);
22fae026 2837#endif
d0063567 2838 }
fd503f5c
DIM
2839 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2840 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2841 break;
79072805 2842 case '\006': /* ^F */
38ab35f8 2843 PL_maxsysfd = SvIV(sv);
79072805 2844 break;
a0d0e21e 2845 case '\010': /* ^H */
efa571ab
KW
2846 {
2847 U32 save_hints = PL_hints;
5d382c25 2848 PL_hints = SvUV(sv);
efa571ab
KW
2849
2850 /* If wasn't UTF-8, and now is, notify the parser */
2851 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2852 notify_parser_that_changed_to_utf8();
2853 }
2854 }
a0d0e21e 2855 break;
9d116dd7 2856 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2857 Safefree(PL_inplace);
bd61b366 2858 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2859 break;
d9bad346
FC
2860 case '\016': /* ^N */
2861 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2862 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2863 goto croakparen;
28f23441 2864 case '\017': /* ^O */
ac27b0f5 2865 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2866 Safefree(PL_osname);
bd61b366 2867 PL_osname = NULL;
3511154c
DM
2868 if (SvOK(sv)) {
2869 TAINT_PROPER("assigning to $^O");
2e0de35c 2870 PL_osname = savesvpv(sv);
3511154c 2871 }
ac27b0f5
NIS
2872 }
2873 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2874 STRLEN len;
2875 const char *const start = SvPV(sv, len);
b54fc2b6 2876 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2877 SV *tmp;
8b850bd5
NC
2878
2879
2880 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2881 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2882
2883 /* Opening for input is more common than opening for output, so
2884 ensure that hints for input are sooner on linked list. */
59cd0e26 2885 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2886 SvUTF8(sv))
2887 : newSVpvs_flags("", SvUTF8(sv));
2888 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2889 mg_set(tmp);
8b850bd5 2890
f747ebd6
Z
2891 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2892 SvUTF8(sv));
2893 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2894 mg_set(tmp);
ac27b0f5 2895 }
28f23441 2896 break;
79072805 2897 case '\020': /* ^P */
2fdbfb4d
AB
2898 PL_perldb = SvIV(sv);
2899 if (PL_perldb && !PL_DBsingle)
2900 init_debugger();
9b9e0be4 2901 break;
79072805 2902 case '\024': /* ^T */
88e89b8a 2903#ifdef BIG_TIME
6b88bc9c 2904 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2905#else
38ab35f8 2906 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2907#endif
79072805 2908 break;
e07ea26a
NC
2909 case '\025': /* ^UTF8CACHE */
2910 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2911 PL_utf8cache = (signed char) sv_2iv(sv);
2912 }
2913 break;
fde18df1 2914 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2915 if (*(mg->mg_ptr+1) == '\0') {
2916 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2917 i = SvIV(sv);
ac27b0f5 2918 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2919 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2920 }
599cee73 2921 }
0a378802 2922 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2923 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450 2924 if (!SvPOK(sv)) {
1113f30d
DM
2925 if (!specialWARN(PL_compiling.cop_warnings))
2926 PerlMemShared_free(PL_compiling.cop_warnings);
7e4f0450 2927 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2928 break;
2929 }
f4fc7782 2930 {
b5477537 2931 STRLEN len, i;
006c1a1d
Z
2932 int not_none = 0, not_all = 0;
2933 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2934 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2935 not_none |= ptr[i];
2936 not_all |= ptr[i] ^ 0x55;
f4fc7782 2937 }
006c1a1d 2938 if (!not_none) {
4243c432
NC
2939 if (!specialWARN(PL_compiling.cop_warnings))
2940 PerlMemShared_free(PL_compiling.cop_warnings);
2941 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2942 } else if (len >= WARNsize && !not_all) {
2943 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2944 PerlMemShared_free(PL_compiling.cop_warnings);
2945 PL_compiling.cop_warnings = pWARN_ALL;
2946 PL_dowarn |= G_WARN_ONCE ;
2947 }
d3a7d8c7 2948 else {
72dc9ed5
NC
2949 STRLEN len;
2950 const char *const p = SvPV_const(sv, len);
2951
2952 PL_compiling.cop_warnings
8ee4cf24 2953 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2954 p, len);
2955
d3a7d8c7
GS
2956 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2957 PL_dowarn |= G_WARN_ONCE ;
2958 }
f4fc7782 2959
d3a7d8c7 2960 }
4438c4b7 2961 }
971a9dd3 2962 }
8ca2a5d6
DD
2963#ifdef WIN32
2964 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2965 w32_sloppystat = (bool)sv_true(sv);
2966 }
2967#endif
79072805
LW
2968 break;
2969 case '.':
3280af22
NIS
2970 if (PL_localizing) {
2971 if (PL_localizing == 1)
7766f137 2972 SAVESPTR(PL_last_in_gv);
748a9306 2973 }
3280af22 2974 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2975 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2976 break;
2977 case '^':
acbe1b9d 2978 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2979 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2980 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2981 break;
2982 case '~':
acbe1b9d 2983 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2984 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2985 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2986 break;
2987 case '=':
acbe1b9d 2988 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2989 break;
2990 case '-':
acbe1b9d
FC
2991 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2992 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2993 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2994 break;
2995 case '%':
acbe1b9d 2996 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2997 break;
2998 case '|':
4b65379b 2999 {
099be4f1 3000 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
3001 if(!io)
3002 break;
38ab35f8 3003 if ((SvIV(sv)) == 0)
4b65379b
CS
3004 IoFLAGS(io) &= ~IOf_FLUSH;
3005 else {
3006 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3007 PerlIO *ofp = IoOFP(io);
3008 if (ofp)
3009 (void)PerlIO_flush(ofp);
3010 IoFLAGS(io) |= IOf_FLUSH;
3011 }
3012 }
79072805
LW
3013 }
3014 break;
79072805 3015 case '/':
1ab48e3a 3016 {
1ab48e3a 3017 if (SvROK(sv)) {
8d37cdf7
DIM
3018 SV *referent = SvRV(sv);
3019 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3020 /* XXX: dodgy type check: This leaves me feeling dirty, but
3021 * the alternative is to copy pretty much the entire
3022 * sv_reftype() into this routine, or to do a full string
3023 * comparison on the return of sv_reftype() both of which
3024 * make me feel worse! NOTE, do not modify this comment
3025 * without reviewing the corresponding comment in
3026 * sv_reftype(). - Yves */
1ab48e3a 3027 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3028 IV val = SvIV(referent);
1ab48e3a 3029 if (val <= 0) {
520b6fb6
DIM
3030 sv_setsv(sv, PL_rs);
3031 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3032 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3033 }
3034 } else {
ddce084a 3035 sv_setsv(sv, PL_rs);
8d37cdf7 3036 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3037 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3038 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3039 }
3040 }
b3a2acfa 3041 SvREFCNT_dec(PL_rs);
520b6fb6 3042 PL_rs = newSVsv(sv);
b3a2acfa 3043 }
79072805
LW
3044 break;
3045 case '\\':
ef8d46e8 3046 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3047 if (SvOK(sv)) {
7889fe52 3048 PL_ors_sv = newSVsv(sv);
009c130f 3049 }
e3c19b7b 3050 else {
a0714e2c 3051 PL_ors_sv = NULL;
e3c19b7b 3052 }
79072805 3053 break;
7d69d4a6
FC
3054 case '[':
3055 if (SvIV(sv) != 0)
3056 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3057 break;
79072805 3058 case '?':
ff0cee69 3059#ifdef COMPLEX_STATUS
6b88bc9c 3060 if (PL_localizing == 2) {
41cb7b2b 3061 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3062 PL_statusvalue = LvTARGOFF(sv);
3063 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3064 }
3065 else
3066#endif
3067#ifdef VMSISH_STATUS
3068 if (VMSISH_STATUS)
fb38d079 3069 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3070 else
3071#endif
38ab35f8 3072 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3073 break;
3074 case '!':
93189314
JH
3075 {
3076#ifdef VMS
3077# define PERL_VMS_BANG vaxc$errno
3078#else
3079# define PERL_VMS_BANG 0
3080#endif
27329181 3081#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
3082 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3083 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3084#else
91487cfc 3085 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3086 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3087#endif
93189314 3088 }
79072805
LW
3089 break;
3090 case '<':
985213f2 3091 {
b469f1e0 3092 /* XXX $< currently silently ignores failures */
dfff4baf 3093 const Uid_t new_uid = SvUID(sv);
985213f2 3094 PL_delaymagic_uid = new_uid;
3280af22
NIS
3095 if (PL_delaymagic) {
3096 PL_delaymagic |= DM_RUID;
79072805
LW
3097 break; /* don't do magic till later */
3098 }
3099#ifdef HAS_SETRUID
b469f1e0 3100 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3101#elif defined(HAS_SETREUID)
b469f1e0 3102 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3103#elif defined(HAS_SETRESUID)
b469f1e0 3104 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3105#else
985213f2 3106 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3107# ifdef PERL_DARWIN
75870ed3 3108 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3109 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3110 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3111# endif
b469f1e0 3112 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3113 } else {
cea2e8a9 3114 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3115 }
79072805 3116#endif
79072805 3117 break;
985213f2 3118 }
79072805 3119 case '>':
985213f2 3120 {
b469f1e0 3121 /* XXX $> currently silently ignores failures */
dfff4baf 3122 const Uid_t new_euid = SvUID(sv);
985213f2 3123 PL_delaymagic_euid = new_euid;
3280af22
NIS
3124 if (PL_delaymagic) {
3125 PL_delaymagic |= DM_EUID;
79072805
LW
3126 break; /* don't do magic till later */
3127 }
3128#ifdef HAS_SETEUID
b469f1e0 3129 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3130#elif defined(HAS_SETREUID)
b469f1e0 3131 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3132#elif defined(HAS_SETRESUID)
b469f1e0 3133 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3134#else
985213f2 3135 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3136 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3137 else {
cea2e8a9 3138 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3139 }
79072805 3140#endif
79072805 3141 break;
985213f2 3142 }
79072805 3143 case '(':
985213f2 3144 {
b469f1e0 3145 /* XXX $( currently silently ignores failures */
dfff4baf 3146 const Gid_t new_gid = SvGID(sv);
985213f2 3147 PL_delaymagic_gid = new_gid;
3280af22
NIS
3148 if (PL_delaymagic) {
3149 PL_delaymagic |= DM_RGID;
79072805
LW
3150 break; /* don't do magic till later */
3151 }
3152#ifdef HAS_SETRGID
b469f1e0 3153 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3154#elif defined(HAS_SETREGID)
b469f1e0 3155 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3156#elif defined(HAS_SETRESGID)
b469f1e0 3157 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3158#else
985213f2 3159 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3160 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3161 else {
cea2e8a9 3162 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3163 }
79072805 3164#endif
79072805 3165 break;
985213f2 3166 }
79072805 3167 case ')':
985213f2 3168 {
0635704a
HS
3169/* (hv) best guess: maybe we'll need configure probes to do a better job,
3170 * but you can override it if you need to.
3171 */
3172#ifndef INVALID_GID
3173#define INVALID_GID ((Gid_t)-1)
3174#endif
b469f1e0 3175 /* XXX $) currently silently ignores failures */
dfff4baf 3176 Gid_t new_egid;
5cd24f17
PP
3177#ifdef HAS_SETGROUPS
3178 {
b83604b4 3179 const char *p = SvPV_const(sv, len);
757f63d8 3180 Groups_t *gary = NULL;
5d4a52b5 3181 const char* endptr = p + len;
22ff3130 3182 UV uv;
fb4089e0 3183#ifdef _SC_NGROUPS_MAX
3184 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3185
3186 if (maxgrp < 0)
3187 maxgrp = NGROUPS;
3188#else
3189 int maxgrp = NGROUPS;
3190#endif
757f63d8
SP
3191
3192 while (isSPACE(*p))
3193 ++p;
22ff3130
HS
3194 if (grok_atoUV(p, &uv, &endptr))
3195 new_egid = (Gid_t)uv;
3196 else {
0635704a 3197 new_egid = INVALID_GID;
22ff3130
HS
3198 endptr = NULL;
3199 }
fb4089e0 3200 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3201 if (endptr == NULL)
3202 break;
3203 p = endptr;
757f63d8
SP
3204 while (isSPACE(*p))
3205 ++p;
3206 if (!*p)
3207 break;
fdadaf77 3208 if (!gary)
757f63d8
SP
3209 Newx(gary, i + 1, Groups_t);
3210 else
3211 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3212 if (grok_atoUV(p, &uv, &endptr))
3213 gary[i] = (Groups_t)uv;
3214 else {
0635704a 3215 gary[i] = INVALID_GID;
22ff3130
HS
3216 endptr = NULL;
3217 }
757f63d8
SP
3218 }
3219 if (i)
b469f1e0 3220 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3221 Safefree(gary);
5cd24f17
PP
3222 }
3223#else /* HAS_SETGROUPS */
dfff4baf 3224 new_egid = SvGID(sv);
5cd24f17 3225#endif /* HAS_SETGROUPS */
985213f2 3226 PL_delaymagic_egid = new_egid;
3280af22
NIS
3227 if (PL_delaymagic) {
3228 PL_delaymagic |= DM_EGID;
79072805
LW
3229 break; /* don't do magic till later */
3230 }
3231#ifdef HAS_SETEGID
b469f1e0 3232 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3233#elif defined(HAS_SETREGID)
b469f1e0 3234 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3235#elif defined(HAS_SETRESGID)
b469f1e0 3236 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3237#else
985213f2 3238 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3239 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3240 else {
cea2e8a9 3241 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3242 }
79072805 3243#endif
79072805 3244 break;
985213f2 3245 }
79072805 3246 case ':':
2d8e6c8d 3247 PL_chopset = SvPV_force(sv,len);
79072805 3248 break;
9cdac2a2
FC
3249 case '$': /* $$ */
3250 /* Store the pid in mg->mg_obj so we can tell when a fork has
3251 occurred. mg->mg_obj points to *$ by default, so clear it. */
3252 if (isGV(mg->mg_obj)) {
3253 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3254 SvREFCNT_dec(mg->mg_obj);
3255 mg->mg_flags |= MGf_REFCOUNTED;
3256 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3257 }
3258 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3259 break;
79072805 3260 case '0':
e2975953 3261 LOCK_DOLLARZERO_MUTEX;
f1540bed 3262 S_set_dollarzero(aTHX_ sv);
e2975953 3263 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3264 break;
3265 }
3266 return 0;
3267}
3268
3269I32
84c7b88c
BF
3270Perl_whichsig_sv(pTHX_ SV *sigsv)
3271{
3272 const char *sigpv;
3273 STRLEN siglen;
3274 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3275 sigpv = SvPV_const(sigsv, siglen);
3276 return whichsig_pvn(sigpv, siglen);
3277}
3278
3279I32
3280Perl_whichsig_pv(pTHX_ const char *sig)
3281{
3282 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3283 return whichsig_pvn(sig, strlen(sig));
3284}
3285
3286I32
3287Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3288{
eb578fdb 3289 char* const* sigv;
7918f24d 3290
84c7b88c 3291 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3292 PERL_UNUSED_CONTEXT;
79072805 3293
aadb217d 3294 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3295 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3296 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3297#ifdef SIGCLD
84c7b88c 3298 if (memEQs(sig, len, "CHLD"))
79072805
LW
3299 return SIGCLD;
3300#endif
3301#ifdef SIGCHLD
84c7b88c 3302 if (memEQs(sig, len, "CLD"))
79072805
LW
3303 return SIGCHLD;
3304#endif
7f1236c0 3305 return -1;
79072805
LW
3306}
3307
ecfc5424 3308Signal_t
1e82f5a6 3309#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3310Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3311#else
3312Perl_sighandler(int sig)
3313#endif
79072805 3314{
1018e26f
NIS
3315#ifdef PERL_GET_SIG_CONTEXT
3316 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3317#else
cea2e8a9 3318 dTHX;
71d280e3 3319#endif
79072805 3320 dSP;
a0714e2c
SS
3321 GV *gv = NULL;
3322 SV *sv = NULL;
8772537c 3323 SV * const tSv = PL_Sv;
601f1833 3324 CV *cv = NULL;
533c011a 3325 OP *myop = PL_op;
84902520 3326 U32 flags = 0;
8772537c 3327 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3328 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3329 SV *errsv_save = NULL;
71d280e3 3330
84902520 3331
727405f8 3332 if (!PL_psig_ptr[sig]) {
99ef548b 3333 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3334 PL_sig_name[sig]);
3335 exit(sig);
3336 }
ff0cee69 3337
a0d63a7b
DM
3338 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3339 /* Max number of items pushed there is 3*n or 4. We cannot fix
3340 infinity, so we fix 4 (in fact 5): */
3341 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3342 flags |= 1;
3343 PL_savestack_ix += 5; /* Protect save in progress. */
3344 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3345 }
84902520 3346 }
84902520 3347 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3348 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3349 || SvTYPE(cv) != SVt_PVCV) {
3350 HV *st;
f2c0649b 3351 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3352 }
84902520 3353
a0d0e21e 3354 if (!cv || !CvROOT(cv)) {
07c325bb 3355 const HEK * const hek = gv
1d6bb9ae
FC
3356 ? GvENAME_HEK(gv)
3357 : cv && CvNAMED(cv)
3358 ? CvNAME_HEK(cv)
07c325bb
FC
3359 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3360 if (hek)
3361 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3362 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3363 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3364 /* diag_listed_as: SIG%s handler "%s" not defined */
3365 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3366 "SIG%s handler \"__ANON__\" not defined.\n",
3367 PL_sig_name[sig]);
00d579c5 3368 goto cleanup;
79072805
LW
3369 }
3370
0c4d3b5e
DM
3371 sv = PL_psig_name[sig]
3372 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3373 : newSVpv(PL_sig_name[sig],0);
72048cfe 3374 flags |= 8;
0c4d3b5e
DM
3375 SAVEFREESV(sv);
3376
a0d63a7b
DM
3377 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3378 /* make sure our assumption about the size of the SAVEs are correct:
3379 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3380 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3381 }
e336de0d 3382
e788e7d3 3383 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3384 PUSHMARK(SP);
79072805 3385 PUSHs(sv);
8aad04aa
JH
3386#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3387 {
3388 struct sigaction oact;
3389
3390 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3391 if (sip) {
3392 HV *sih = newHV();
ad64d0ec 3393 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3394 /* The siginfo fields signo, code, errno, pid, uid,
3395 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3396 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3397 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3398#ifdef HAS_SIGINFO_SI_ERRNO
3399 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3400#endif
3401#ifdef HAS_SIGINFO_SI_STATUS
3402 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3403#endif
3404#ifdef HAS_SIGINFO_SI_UID
3405 {
3406 SV *uid = newSV(0);
3407 sv_setuid(uid, sip->si_uid);
3408 (void)hv_stores(sih, "uid", uid);
3409 }
3410#endif
3411#ifdef HAS_SIGINFO_SI_PID
3412 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3413#endif
3414#ifdef HAS_SIGINFO_SI_ADDR
3415 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3416#endif
3417#ifdef HAS_SIGINFO_SI_BAND
3418 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3419#endif
8aad04aa 3420 EXTEND(SP, 2);
ad64d0ec 3421 PUSHs(rv);
22f1178f 3422 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3423 }
b4552a27 3424
8aad04aa
JH
3425 }
3426 }
3427#endif
79072805 3428 PUTBACK;
a0d0e21e 3429
100c03aa
JL
3430 errsv_save = newSVsv(ERRSV);
3431
ad64d0ec 3432 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3433
d3acc0f7 3434 POPSTACK;
eed484f9
DD
3435 {
3436 SV * const errsv = ERRSV;
3437 if (SvTRUE_NN(errsv)) {
3438 SvREFCNT_dec(errsv_save);
c22d665b 3439#ifndef PERL_MICRO
1b266415
NIS
3440 /* Handler "died", for example to get out of a restart-able read().
3441 * Before we re-do that on its behalf re-enable the signal which was
3442 * blocked by the system when we entered.
3443 */
c22d665b 3444#ifdef HAS_SIGPROCMASK
d488af49 3445#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3446 if (sip || uap)
c22d665b 3447#endif
eed484f9
DD
3448 {
3449 sigset_t set;
3450 sigemptyset(&set);
3451 sigaddset(&set,sig);
3452 sigprocmask(SIG_UNBLOCK, &set, NULL);
3453 }
c22d665b 3454#else
eed484f9
DD
3455 /* Not clear if this will work */
3456 (void)rsignal(sig, SIG_IGN);
3457 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3458#endif
3459#endif /* !PERL_MICRO */
eed484f9
DD
3460 die_sv(errsv);
3461 }
3462 else {
3463 sv_setsv(errsv, errsv_save);
3464 SvREFCNT_dec(errsv_save);
3465 }
100c03aa
JL
3466 }
3467
7b52d656 3468 cleanup:
0c4d3b5e
DM