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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20"Magic" is special data attached to SV structures in order to give them
21"magical" properties. When any Perl code tries to read from, or assign to,
22an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 23with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 24give it a chance to update its internal value (get on $. writes the line
b53c43bf 25number of the last read filehandle into the SV's IV slot), while
166f8a29 26set is called after an SV has been written to, in order to allow it to make
ddfa107c 27use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
28PL_rs global variable).
29
30Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 31SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 32of functions that implement the get(), set(), length() etc functions,
154e47c8 33plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
34a MAGIC structure that contains a pointer to the object associated with the
35tie.
36
7fefc6c1
KW
37=cut
38
ccfc67b7
JH
39*/
40
79072805 41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_MG_C
79072805
LW
43#include "perl.h"
44
5cd24f17 45#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
46# ifdef I_GRP
47# include <grp.h>
48# endif
188ea221
CS
49#endif
50
757f63d8
SP
51#if defined(HAS_SETGROUPS)
52# ifndef NGROUPS
53# define NGROUPS 32
54# endif
55#endif
56
17aa7f3d
JH
57#ifdef __hpux
58# include <sys/pstat.h>
59#endif
60
7636ea95
AB
61#ifdef HAS_PRCTL_SET_NAME
62# include <sys/prctl.h>
63#endif
64
8aad04aa 65#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 66Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 67#else
e69880a5 68Signal_t Perl_csighandler(int sig);
8aad04aa 69#endif
e69880a5 70
9cffb111
OS
71#ifdef __Lynx__
72/* Missing protos on LynxOS */
73void setruid(uid_t id);
74void seteuid(uid_t id);
75void setrgid(uid_t id);
76void setegid(uid_t id);
77#endif
78
c07a80fd 79/*
4bac9ae4 80 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
82 */
83
84struct magic_state {
85 SV* mgs_sv;
455ece5e 86 I32 mgs_ss_ix;
a623f893 87 U32 mgs_flags;
150b625d 88 bool mgs_bumped;
c07a80fd 89};
455ece5e 90/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
91
92STATIC void
ff44333e 93S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
c07a80fd 94{
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d 97
ff44333e 98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 99
4bac9ae4
CS
100 assert(SvMAGICAL(sv));
101
150b625d
DM
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
110 bumped = TRUE;
111 }
8985fe98 112
8772537c 113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
114
115 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 116 mgs->mgs_sv = sv;
a623f893 117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 119 mgs->mgs_bumped = bumped;
c07a80fd 120
ff44333e 121 SvFLAGS(sv) &= ~flags;
3805b5fb 122 SvREADONLY_off(sv);
c07a80fd
PP
123}
124
ff44333e
FC
125#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
126
954c1994
GS
127/*
128=for apidoc mg_magical
129
fbe13c60 130Turns on the magical status of an SV. See C<L</sv_magic>>.
954c1994
GS
131
132=cut
133*/
134
8990e307 135void
ddeaf645 136Perl_mg_magical(SV *sv)
8990e307 137{
e1ec3a88 138 const MAGIC* mg;
7918f24d 139 PERL_ARGS_ASSERT_MG_MAGICAL;
f9c6fee5
CS
140
141 SvMAGICAL_off(sv);
218787bd 142 if ((mg = SvMAGIC(sv))) {
218787bd
VP
143 do {
144 const MGVTBL* const vtbl = mg->mg_virtual;
145 if (vtbl) {
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 SvGMAGICAL_on(sv);
148 if (vtbl->svt_set)
149 SvSMAGICAL_on(sv);
150 if (vtbl->svt_clear)
151 SvRMAGICAL_on(sv);
152 }
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
155 SvRMAGICAL_on(sv);
8990e307
LW
156 }
157}
158
954c1994
GS
159/*
160=for apidoc mg_get
161
4b1e7f06 162Do magic before a value is retrieved from the SV. The type of SV must
796b6530 163be >= C<SVt_PVMG>. See C<L</sv_magic>>.
954c1994
GS
164
165=cut
166*/
167
79072805 168int
864dbfa3 169Perl_mg_get(pTHX_ SV *sv)
79072805 170{
35a4481c 171 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 172 bool saved = FALSE;
f9c6fee5 173 bool have_new = 0;
b949b68f 174 bool taint_only = TRUE; /* the only get method seen is taint */
ff76feab 175 MAGIC *newmg, *head, *cur, *mg;
6683b158 176
7918f24d
NC
177 PERL_ARGS_ASSERT_MG_GET;
178
407287f9
FC
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
180
ff76feab
AMS
181 /* We must call svt_get(sv, mg) for each valid entry in the linked
182 list of magic. svt_get() may delete the current entry, add new
183 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184
185 newmg = cur = head = mg = SvMAGIC(sv);
186 while (mg) {
35a4481c 187 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 189
2b260de0 190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
191
192 /* taint's mg get is so dumb it doesn't need flag saving */
b949b68f
DM
193 if (mg->mg_type != PERL_MAGIC_taint) {
194 taint_only = FALSE;
195 if (!saved) {
196 save_magic(mgs_ix, sv);
197 saved = TRUE;
198 }
199 }
a9844598 200
16c91539 201 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 202
58f82c5c
DM
203 /* guard against magic having been deleted - eg FETCH calling
204 * untie */
f9c6fee5 205 if (!SvMAGIC(sv)) {
a623f893
FC
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 208 break;
f9c6fee5 209 }
b77f7d40 210
f9c6fee5 211 /* recalculate flags if this entry was deleted. */
ff76feab 212 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 215 }
7d1328bb 216 else if (vtbl == &PL_vtbl_utf8) {
b949b68f
DM
217 /* get-magic can reallocate the PV, unless there's only taint
218 * magic */
219 if (taint_only) {
220 MAGIC *mg2;
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
224 && mg2->mg_virtual
225 && mg2->mg_virtual->svt_get
226 ) {
227 taint_only = FALSE;
228 break;
229 }
230 }
231 }
232 if (!taint_only)
233 magic_setutf8(sv, mg);
7d1328bb 234 }
ff76feab 235
f9c6fee5 236 mg = nextmg;
ff76feab 237
0723351e 238 if (have_new) {
ff76feab
AMS
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
241 if (mg == head) {
0723351e 242 have_new = 0;
ff76feab
AMS
243 mg = cur;
244 head = newmg;
245 }
246 }
247
248 /* Were any new entries added? */
0723351e
NC
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
250 have_new = 1;
ff76feab
AMS
251 cur = mg;
252 mg = newmg;
a623f893
FC
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 255 }
79072805 256 }
463ee0b2 257
a9844598
CS
258 if (saved)
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
260
79072805
LW
261 return 0;
262}
263
954c1994
GS
264/*
265=for apidoc mg_set
266
fbe13c60 267Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
268
269=cut
270*/
271
79072805 272int
864dbfa3 273Perl_mg_set(pTHX_ SV *sv)
79072805 274{
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
b5ed8c44
FC
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
282
ff44333e 283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
284
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 286 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 287 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 291 }
e0a73de4 292 if (PL_localizing == 2
b5ed8c44 293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 294 continue;
2b260de0 295 if (vtbl && vtbl->svt_set)
16c91539 296 vtbl->svt_set(aTHX_ sv, mg);
79072805 297 }
463ee0b2 298
8772537c 299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
300 return 0;
301}
302
954c1994
GS
303/*
304=for apidoc mg_length
305
d4e99c76 306Reports on the SV's length in bytes, calling length magic if available,
796b6530 307but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 308magic if there is no 'length' magic, but with no indication as to
796b6530
KW
309whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310higher. Use C<sv_len()> instead.
954c1994
GS
311
312=cut
313*/
314
79072805 315U32
864dbfa3 316Perl_mg_length(pTHX_ SV *sv)
79072805
LW
317{
318 MAGIC* mg;
463ee0b2 319 STRLEN len;
463ee0b2 320
7918f24d
NC
321 PERL_ARGS_ASSERT_MG_LENGTH;
322
79072805 323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 324 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 325 if (vtbl && vtbl->svt_len) {
35a4481c 326 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 327 save_magic(mgs_ix, sv);
a0d0e21e 328 /* omit MGf_GSKIP -- not changed here */
16c91539 329 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
331 return len;
332 }
333 }
334
bd8446cf 335 (void)SvPV_const(sv, len);
463ee0b2 336 return len;
79072805
LW
337}
338
8fb26106 339I32
864dbfa3 340Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
341{
342 MAGIC* mg;
ac27b0f5 343
7918f24d
NC
344 PERL_ARGS_ASSERT_MG_SIZE;
345
93965878 346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 347 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 348 if (vtbl && vtbl->svt_len) {
35a4481c
AL
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
350 I32 len;
455ece5e 351 save_magic(mgs_ix, sv);
93965878 352 /* omit MGf_GSKIP -- not changed here */
16c91539 353 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
355 return len;
356 }
357 }
358
359 switch(SvTYPE(sv)) {
360 case SVt_PVAV:
502c6561 361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
362 case SVt_PVHV:
363 /* FIXME */
364 default:
cea2e8a9 365 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 366
93965878 367 }
a25b5927 368 NOT_REACHED; /* NOTREACHED */
93965878
NIS
369}
370
954c1994
GS
371/*
372=for apidoc mg_clear
373
fbe13c60 374Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
375
376=cut
377*/
378
79072805 379int
864dbfa3 380Perl_mg_clear(pTHX_ SV *sv)
79072805 381{
35a4481c 382 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 383 MAGIC* mg;
8ac77ac9 384 MAGIC *nextmg;
463ee0b2 385
7918f24d
NC
386 PERL_ARGS_ASSERT_MG_CLEAR;
387
455ece5e 388 save_magic(mgs_ix, sv);
463ee0b2 389
8ac77ac9 390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 391 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 392 /* omit GSKIP -- never set here */
727405f8 393
8ac77ac9
NC
394 nextmg = mg->mg_moremagic; /* it may delete itself */
395
2b260de0 396 if (vtbl && vtbl->svt_clear)
16c91539 397 vtbl->svt_clear(aTHX_ sv, mg);
79072805 398 }
463ee0b2 399
8772537c 400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
401 return 0;
402}
403
ed624ca8 404static MAGIC*
ddeaf645 405S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 406{
39de7f53
FR
407 assert(flags <= 1);
408
409 if (sv) {
410 MAGIC *mg;
411
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
414 return mg;
415 }
416 }
417 }
418
419 return NULL;
420}
421
954c1994
GS
422/*
423=for apidoc mg_find
424
796b6530 425Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
426
427=cut
428*/
429
93a17b20 430MAGIC*
ddeaf645 431Perl_mg_find(const SV *sv, int type)
93a17b20 432{
ddeaf645 433 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
434}
435
436/*
437=for apidoc mg_findext
438
439Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 440C<L</sv_magicext>>.
39de7f53
FR
441
442=cut
443*/
444
445MAGIC*
ddeaf645 446Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 447{
ddeaf645 448 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
449}
450
96c2a8ff
FC
451MAGIC *
452Perl_mg_find_mglob(pTHX_ SV *sv)
453{
454 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
455 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
456 /* This sv is only a delegate. //g magic must be attached to
457 its target. */
458 vivify_defelem(sv);
459 sv = LvTARG(sv);
460 }
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
463 return NULL;
464}
465
954c1994
GS
466/*
467=for apidoc mg_copy
468
fbe13c60 469Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
470
471=cut
472*/
473
79072805 474int
864dbfa3 475Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 476{
463ee0b2 477 int count = 0;
79072805 478 MAGIC* mg;
7918f24d
NC
479
480 PERL_ARGS_ASSERT_MG_COPY;
481
463ee0b2 482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 483 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 486 }
823a54a3
AL
487 else {
488 const char type = mg->mg_type;
1e73acc8 489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
490 sv_magic(nsv,
491 (type == PERL_MAGIC_tied)
492 ? SvTIED_obj(sv, mg)
27deb0cf 493 : mg->mg_obj,
823a54a3
AL
494 toLOWER(type), key, klen);
495 count++;
496 }
79072805 497 }
79072805 498 }
463ee0b2 499 return count;
79072805
LW
500}
501
954c1994 502/*
0cbee0a4
DM
503=for apidoc mg_localize
504
9711599e 505Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW
506SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507gets copied, value magic doesn't (I<e.g.>,
796b6530 508C<taint>, C<pos>).
9711599e 509
796b6530 510If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 511This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 512and that will handle the magic.
0cbee0a4
DM
513
514=cut
515*/
516
517void
af7df257 518Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
519{
520 MAGIC *mg;
7918f24d
NC
521
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
523
658a9f31
JD
524 if (nsv == DEFSV)
525 return;
526
0cbee0a4 527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 528 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 530 continue;
0cbee0a4 531
a5063e7c 532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 533 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 534 else
0cbee0a4
DM
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
a5063e7c 537
0cbee0a4 538 /* container types should remain read-only across localization */
9ff3e6d8 539 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
540 }
541
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 544 if (setmagic) {
9711599e
CS
545 PL_localizing = 1;
546 SvSETMAGIC(nsv);
547 PL_localizing = 0;
548 }
0cbee0a4
DM
549 }
550}
551
d9088386
Z
552#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
553static void
554S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
555{
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
559 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
564 }
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
567 Safefree(mg);
568}
569
0cbee0a4 570/*
954c1994
GS
571=for apidoc mg_free
572
fbe13c60 573Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
574
575=cut
576*/
577
79072805 578int
864dbfa3 579Perl_mg_free(pTHX_ SV *sv)
79072805
LW
580{
581 MAGIC* mg;
582 MAGIC* moremagic;
7918f24d
NC
583
584 PERL_ARGS_ASSERT_MG_FREE;
585
79072805 586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 587 moremagic = mg->mg_moremagic;
d9088386 588 mg_free_struct(sv, mg);
c826f41b 589 SvMAGIC_set(sv, moremagic);
79072805 590 }
b162af07 591 SvMAGIC_set(sv, NULL);
68f8932e 592 SvMAGICAL_off(sv);
79072805
LW
593 return 0;
594}
595
d9088386
Z
596/*
597=for apidoc Am|void|mg_free_type|SV *sv|int how
598
2d7f6611 599Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z
600
601=cut
602*/
603
604void
605Perl_mg_free_type(pTHX_ SV *sv, int how)
606{
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
d9088386
Z
610 moremg = mg->mg_moremagic;
611 if (mg->mg_type == how) {
19742f39 612 MAGIC *newhead;
d9088386
Z
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
615 if (prevmg) {
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
618 SvMAGIC_set(sv, mg);
619 }
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
623 mg = prevmg;
624 }
625 }
626 mg_magical(sv);
627}
628
79072805 629#include <signal.h>
79072805 630
942e002e 631U32
864dbfa3 632Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 633{
8772537c 634 PERL_UNUSED_ARG(sv);
6cef1e77 635
7918f24d
NC
636 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
637
0bd48802 638 if (PL_curpm) {
27deb0cf 639 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 640 if (rx) {
27deb0cf
YO
641 UV uv= (UV)mg->mg_obj;
642 if (uv == '+') { /* @+ */
a678b0e4 643 /* return the number possible */
07bc277f 644 return RX_NPARENS(rx);
27deb0cf 645 } else { /* @- @^CAPTURE @{^CAPTURE} */
07bc277f 646 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
647
648 /* return the last filled */
f46c4081 649 while ( paren >= 0
07bc277f
NC
650 && (RX_OFFS(rx)[paren].start == -1
651 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 652 paren--;
27deb0cf
YO
653 if (uv == '-') {
654 /* @- */
655 return (U32)paren;
656 } else {
657 /* @^CAPTURE @{^CAPTURE} */
658 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
659 }
660 }
0bd48802 661 }
8f580fb8 662 }
ac27b0f5 663
942e002e 664 return (U32)-1;
6cef1e77
IZ
665}
666
6502e081
DM
667/* @-, @+ */
668
6cef1e77 669int
864dbfa3 670Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 671{
7918f24d
NC
672 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
673
0bd48802 674 if (PL_curpm) {
27deb0cf 675 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 676 if (rx) {
27deb0cf
YO
677 const UV uv= (UV)mg->mg_obj;
678 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
679 const I32 paren = mg->mg_len
680 + (uv == '\003' ? 1 : 0);
a10eae29
FC
681 SSize_t s;
682 SSize_t t;
0bd48802
AL
683 if (paren < 0)
684 return 0;
07bc277f
NC
685 if (paren <= (I32)RX_NPARENS(rx) &&
686 (s = RX_OFFS(rx)[paren].start) != -1 &&
687 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 688 {
a10eae29 689 SSize_t i;
27deb0cf
YO
690
691 if (uv == '+') /* @+ */
0bd48802 692 i = t;
27deb0cf 693 else if (uv == '-') /* @- */
0bd48802 694 i = s;
27deb0cf
YO
695 else { /* @^CAPTURE @{^CAPTURE} */
696 CALLREG_NUMBUF_FETCH(rx,paren,sv);
697 return 0;
698 }
0bd48802 699
a10eae29 700 if (RX_MATCH_UTF8(rx)) {
07bc277f 701 const char * const b = RX_SUBBEG(rx);
0bd48802 702 if (b)
6502e081
DM
703 i = RX_SUBCOFFSET(rx) +
704 utf8_length((U8*)b,
705 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 706 }
727405f8 707
a10eae29 708 sv_setuv(sv, i);
232af1f8 709 return 0;
1aa99e6b 710 }
0bd48802 711 }
6cef1e77 712 }
232af1f8 713 sv_setsv(sv, NULL);
6cef1e77
IZ
714 return 0;
715}
716
6502e081
DM
717/* @-, @+ */
718
e4b89193 719int
a29d06ed
MG
720Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
721{
7918f24d 722 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 723 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
724 PERL_UNUSED_ARG(sv);
725 PERL_UNUSED_ARG(mg);
cb077ed2 726 Perl_croak_no_modify();
0dbb1585 727 NORETURN_FUNCTION_END;
a29d06ed
MG
728}
729
ad3296c6 730#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
731 if (SvPOK(sv)) { \
732 STRLEN len = SvCUR(sv); \
733 char * const p = SvPVX(sv); \
8e6b4db6
PC
734 while (len > 0 && isSPACE(p[len-1])) \
735 --len; \
736 SvCUR_set(sv, len); \
737 p[len] = '\0'; \
738 } \
ad3296c6
SH
739} STMT_END
740
8b850bd5
NC
741void
742Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
743{
7918f24d
NC
744 PERL_ARGS_ASSERT_EMULATE_COP_IO;
745
8b850bd5 746 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
e03e82a0 747 sv_set_undef(sv);
8b850bd5 748 else {
b2aed775 749 SvPVCLEAR(sv);
8b850bd5
NC
750 SvUTF8_off(sv);
751 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 752 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
753 assert(value);
754 sv_catsv(sv, value);
755 }
756 sv_catpvs(sv, "\0");
757 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 758 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
759 assert(value);
760 sv_catsv(sv, value);
761 }
762 }
763}
764
d9fe7d23
KW
765STATIC void
766S_fixup_errno_string(pTHX_ SV* sv)
767{
768 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
769 * Perl space. */
770
771 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
772
773 assert(SvOK(sv));
b35e4f8b
KW
774
775 if(strEQ(SvPVX(sv), "")) {
776 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
777 }
778 else {
d9fe7d23 779
d3c0b317
KW
780 /* In some locales the error string may come back as UTF-8, in which
781 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
782 * avoid as many possible backward compatibility issues as possible, we
783 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW
784 * an entirely invariant string. We assume that if the string looks
785 * like UTF-8, it really is UTF-8: "text in any other encoding that
786 * uses bytes with the high bit set is extremely unlikely to pass a
787 * UTF-8 validity test"
788 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
789 * potential that we will get it wrong however, especially on short
790 * error message text. (If it turns out to be necessary, we could also
791 * keep track if the current LC_MESSAGES locale is UTF-8) */
d3c0b317 792 if (! IN_BYTES /* respect 'use bytes' */
c5f058df 793 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
d3c0b317
KW
794 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
795 {
796 SvUTF8_on(sv);
797 }
b35e4f8b 798 }
d9fe7d23
KW
799}
800
25bbd826
CB
801#ifdef VMS
802#include <descrip.h>
803#include <starlet.h>
804#endif
805
79072805 806int
864dbfa3 807Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 808{
eb578fdb
KW
809 I32 paren;
810 const char *s = NULL;
811 REGEXP *rx;
823a54a3 812 const char * const remaining = mg->mg_ptr + 1;
e91d8259 813 char nextchar;
79072805 814
7918f24d
NC
815 PERL_ARGS_ASSERT_MAGIC_GET;
816
e91d8259 817 if (!mg->mg_ptr) {
e91d8259 818 paren = mg->mg_len;
e91d8259 819 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 820 do_numbuf_fetch:
e91d8259 821 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 822 }
e03e82a0
DM
823 else
824 goto set_undef;
e91d8259
NC
825 return 0;
826 }
827
828 nextchar = *remaining;
79072805 829 switch (*mg->mg_ptr) {
748a9306 830 case '\001': /* ^A */
f2da823f 831 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
832 else
833 sv_set_undef(sv);
125b9982
NT
834 if (SvTAINTED(PL_bodytarget))
835 SvTAINTED_on(sv);
748a9306 836 break;
e5218da5 837 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 838 if (nextchar == '\0') {
e5218da5
GA
839 sv_setiv(sv, (IV)PL_minus_c);
840 }
823a54a3 841 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
842 sv_setiv(sv, (IV)STATUS_NATIVE);
843 }
49460fe6
NIS
844 break;
845
79072805 846 case '\004': /* ^D */
aea4f609 847 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 848 break;
28f23441 849 case '\005': /* ^E */
6c6eab55
KW
850 if (nextchar != '\0') {
851 if (strEQ(remaining, "NCODING"))
199670db 852 sv_setsv(sv, NULL);
4f4ff3a7 853 break;
6c6eab55 854 }
4f4ff3a7
KW
855
856#if defined(VMS) || defined(OS2) || defined(WIN32)
857# if defined(VMS)
2a99ff86
KW
858 {
859 char msg[255];
860 $DESCRIPTOR(msgdsc,msg);
861 sv_setnv(sv,(NV) vaxc$errno);
862 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
863 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
864 else
b2aed775 865 SvPVCLEAR(sv);
2a99ff86 866 }
4b645107 867#elif defined(OS2)
2a99ff86
KW
868 if (!(_emx_env & 0x200)) { /* Under DOS */
869 sv_setnv(sv, (NV)errno);
2c6ee1a7 870 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
871 } else {
872 if (errno != errno_isOS2) {
873 const int tmp = _syserrno();
874 if (tmp) /* 2nd call to _syserrno() makes it 0 */
875 Perl_rc = tmp;
876 }
877 sv_setnv(sv, (NV)Perl_rc);
878 sv_setpv(sv, os2error(Perl_rc));
879 }
1534c6f5 880 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
881 fixup_errno_string(sv);
882 }
4f4ff3a7 883# elif defined(WIN32)
2a99ff86
KW
884 {
885 const DWORD dwErr = GetLastError();
886 sv_setnv(sv, (NV)dwErr);
887 if (dwErr) {
888 PerlProc_GetOSError(sv, dwErr);
2efab60d 889 fixup_errno_string(sv);
2a99ff86
KW
890 }
891 else
b2aed775 892 SvPVCLEAR(sv);
2a99ff86
KW
893 SetLastError(dwErr);
894 }
4f4ff3a7
KW
895# else
896# error Missing code for platform
897# endif
2a99ff86
KW
898 SvRTRIM(sv);
899 SvNOK_on(sv); /* what a wonderful hack! */
900 break;
4f4ff3a7
KW
901#endif /* End of platforms with special handling for $^E; others just fall
902 through to $! */
46f3e16c
KW
903
904 case '!':
905 {
5f1b979d 906 dSAVE_ERRNO;
46f3e16c 907#ifdef VMS
5f1b979d 908 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 909#else
5f1b979d 910 sv_setnv(sv, (NV)errno);
46f3e16c
KW
911#endif
912#ifdef OS2
5f1b979d
KW
913 if (errno == errno_isOS2 || errno == errno_isOS2_set)
914 sv_setpv(sv, os2error(Perl_rc));
915 else
46f3e16c 916#endif
5f1b979d 917 if (! errno) {
b2aed775 918 SvPVCLEAR(sv);
46f3e16c 919 }
5f1b979d
KW
920 else {
921
922 /* Strerror can return NULL on some platforms, which will
923 * result in 'sv' not being considered SvOK. The SvNOK_on()
924 * below will cause just the number part to be valid */
2c6ee1a7 925 sv_setpv(sv, my_strerror(errno));
5f1b979d
KW
926 if (SvOK(sv)) {
927 fixup_errno_string(sv);
928 }
929 }
930 RESTORE_ERRNO;
46f3e16c
KW
931 }
932
933 SvRTRIM(sv);
934 SvNOK_on(sv); /* what a wonderful hack! */
935 break;
936
79072805 937 case '\006': /* ^F */
3280af22 938 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 939 break;
9ebf26ad
FR
940 case '\007': /* ^GLOBAL_PHASE */
941 if (strEQ(remaining, "LOBAL_PHASE")) {
942 sv_setpvn(sv, PL_phase_names[PL_phase],
943 strlen(PL_phase_names[PL_phase]));
944 }
945 break;
a0d0e21e 946 case '\010': /* ^H */
5d382c25 947 sv_setuv(sv, PL_hints);
a0d0e21e 948 break;
9d116dd7 949 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 950 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 951 break;
8561ea1d
FC
952 case '\014': /* ^LAST_FH */
953 if (strEQ(remaining, "AST_FH")) {
954 if (PL_last_in_gv) {
955 assert(isGV_with_GP(PL_last_in_gv));
956 SV_CHECK_THINKFIRST_COW_DROP(sv);
957 prepare_SV_for_RV(sv);
958 SvOK_off(sv);
959 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
960 SvROK_on(sv);
961 sv_rvweaken(sv);
962 }
963 else sv_setsv_nomg(sv, NULL);
964 }
965 break;
ac27b0f5 966 case '\017': /* ^O & ^OPEN */
823a54a3 967 if (nextchar == '\0') {
ac27b0f5 968 sv_setpv(sv, PL_osname);
3511154c
DM
969 SvTAINTED_off(sv);
970 }
823a54a3 971 else if (strEQ(remaining, "PEN")) {
8b850bd5 972 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 973 }
28f23441 974 break;
9ebf26ad 975 case '\020':
a6d0b1b5 976 sv_setiv(sv, (IV)PL_perldb);
79072805 977 break;
fb73857a 978 case '\023': /* ^S */
a6d0b1b5 979 {
bc177e6b 980 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 981 SvOK_off(sv);
3280af22 982 else if (PL_in_eval)
6dc8a9e4 983 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
984 else
985 sv_setiv(sv, 0);
d58bf5aa 986 }
fb73857a 987 break;
79072805 988 case '\024': /* ^T */
823a54a3 989 if (nextchar == '\0') {
88e89b8a 990#ifdef BIG_TIME
7c36658b 991 sv_setnv(sv, PL_basetime);
88e89b8a 992#else
7c36658b 993 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 994#endif
7c36658b 995 }
823a54a3 996 else if (strEQ(remaining, "AINT"))
284167a5
SM
997 sv_setiv(sv, TAINTING_get
998 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 999 : 0);
7c36658b 1000 break;
e07ea26a 1001 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1002 if (strEQ(remaining, "NICODE"))
a05d7ebb 1003 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1004 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1005 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1006 else if (strEQ(remaining, "TF8CACHE"))
1007 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1008 break;
1009 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1010 if (nextchar == '\0')
8298454c 1011 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1012 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1013 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1014 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1015 }
1016 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1017 goto set_undef;
013b78e8 1018 }
d3a7d8c7 1019 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
1020 /* Get the bit mask for $warnings::Bits{all}, because
1021 * it could have been extended by warnings::register */
4bac9ae4
CS
1022 HV * const bits = get_hv("warnings::Bits", 0);
1023 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1024 if (bits_all)
1025 sv_copypv(sv, *bits_all);
1026 else
1027 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1028 }
4438c4b7 1029 else {
72dc9ed5
NC
1030 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1031 *PL_compiling.cop_warnings);
ac27b0f5 1032 }
4438c4b7 1033 }
8ca2a5d6
DD
1034#ifdef WIN32
1035 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1036 sv_setiv(sv, w32_sloppystat);
1037 }
1038#endif
79072805 1039 break;
79072805 1040 case '+':
aaa362c4 1041 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1042 paren = RX_LASTPAREN(rx);
1043 if (paren)
1044 goto do_numbuf_fetch;
79072805 1045 }
e03e82a0 1046 goto set_undef;
a01268b5
JH
1047 case '\016': /* ^N */
1048 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1049 paren = RX_LASTCLOSEPAREN(rx);
1050 if (paren)
1051 goto do_numbuf_fetch;
a01268b5 1052 }
e03e82a0 1053 goto set_undef;
79072805 1054 case '.':
3280af22 1055 if (GvIO(PL_last_in_gv)) {
357c8808 1056 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1057 }
79072805
LW
1058 break;
1059 case '?':
809a5acc 1060 {
809a5acc 1061 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1062#ifdef COMPLEX_STATUS
41cb7b2b 1063 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1064 LvTARGOFF(sv) = PL_statusvalue;
1065 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1066#endif
809a5acc 1067 }
79072805
LW
1068 break;
1069 case '^':
acbe1b9d 1070 if (GvIOp(PL_defoutgv))
099be4f1 1071 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1072 if (s)
1073 sv_setpv(sv,s);
1074 else {
3280af22 1075 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1076 sv_catpvs(sv,"_TOP");
79072805
LW
1077 }
1078 break;
1079 case '~':
acbe1b9d 1080 if (GvIOp(PL_defoutgv))
0daa599b 1081 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1082 if (!s)
3280af22 1083 s = GvENAME(PL_defoutgv);
79072805
LW
1084 sv_setpv(sv,s);
1085 break;
79072805 1086 case '=':
099be4f1 1087 if (GvIO(PL_defoutgv))
0daa599b 1088 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1089 break;
1090 case '-':
099be4f1 1091 if (GvIO(PL_defoutgv))
0daa599b 1092 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1093 break;
1094 case '%':
099be4f1 1095 if (GvIO(PL_defoutgv))
0daa599b 1096 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1097 break;
79072805 1098 case ':':
79072805
LW
1099 case '/':
1100 break;
1101 case '[':
e1dccc0d 1102 sv_setiv(sv, 0);
79072805
LW
1103 break;
1104 case '|':
099be4f1 1105 if (GvIO(PL_defoutgv))
0daa599b 1106 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1107 break;
79072805 1108 case '\\':
b2ce0fda 1109 if (PL_ors_sv)
f28098ff 1110 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1111 else
e03e82a0 1112 goto set_undef;
79072805 1113 break;
0e219455 1114 case '$': /* $$ */
9cdac2a2
FC
1115 {
1116 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1117 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1118 /* never set manually, or at least not since last fork */
1119 sv_setiv(sv, pid);
19db9fb7
Z
1120 /* never unsafe, even if reading in a tainted expression */
1121 SvTAINTED_off(sv);
1122 }
9cdac2a2
FC
1123 /* else a value has been assigned manually, so do nothing */
1124 }
0e219455 1125 break;
79072805 1126 case '<':
dfff4baf 1127 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1128 break;
1129 case '>':
dfff4baf 1130 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1131 break;
1132 case '(':
dfff4baf 1133 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1134 goto add_groups;
1135 case ')':
dfff4baf 1136 sv_setgid(sv, PerlProc_getegid());
79072805 1137 add_groups:
79072805 1138#ifdef HAS_GETGROUPS
79072805 1139 {
57d7c65e 1140 Groups_t *gary = NULL;
375ed12a
JH
1141 I32 num_groups = getgroups(0, gary);
1142 if (num_groups > 0) {
19742f39 1143 I32 i;
375ed12a
JH
1144 Newx(gary, num_groups, Groups_t);
1145 num_groups = getgroups(num_groups, gary);
1146 for (i = 0; i < num_groups; i++)
147e3846 1147 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1148 Safefree(gary);
1149 }
79072805 1150 }
155aba94 1151 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1152#endif
79072805 1153 break;
79072805
LW
1154 case '0':
1155 break;
1156 }
a0d0e21e 1157 return 0;
e03e82a0
DM
1158
1159 set_undef:
1160 sv_set_undef(sv);
1161 return 0;
79072805
LW
1162}
1163
1164int
864dbfa3 1165Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1166{
8772537c 1167 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1168
7918f24d
NC
1169 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1170
79072805 1171 if (uf && uf->uf_val)
24f81a43 1172 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1173 return 0;
1174}
1175
1176int
864dbfa3 1177Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1178{
9ae3433d 1179 STRLEN len = 0, klen;
12033064 1180 const char * const key = MgPV_const(mg,klen);
888a67f6 1181 const char *s = "";
1e422769 1182
7918f24d
NC
1183 PERL_ARGS_ASSERT_MAGIC_SETENV;
1184
613c63b4 1185 SvGETMAGIC(sv);
12033064 1186 if (SvOK(sv)) {
613c63b4
CS
1187 /* defined environment variables are byte strings; unfortunately
1188 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1189 (void)SvPV_force_nomg_nolen(sv);
1190 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1191 if (SvUTF8(sv)) {
1192 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1193 SvUTF8_off(sv);
1194 }
1195 s = SvPVX(sv);
1196 len = SvCUR(sv);
12033064
CS
1197 }
1198 my_setenv(key, s); /* does the deed */
1199
a0d0e21e
LW
1200#ifdef DYNAMIC_ENV_FETCH
1201 /* We just undefd an environment var. Is a replacement */
1202 /* waiting in the wings? */
1203 if (!len) {
6bd66ee9 1204 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1205 if (valp)
4ab59fcc 1206 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1207 }
1208#endif
1e422769 1209
28542d8f 1210#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1211 /* And you'll never guess what the dog had */
1212 /* in its mouth... */
284167a5 1213 if (TAINTING_get) {
1e422769
PP
1214 MgTAINTEDDIR_off(mg);
1215#ifdef VMS
b2aed775 1216 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1217 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1218 int i = 0, j = 0;
1219
6fca0082 1220 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1221 elt = eltbuf;
1e422769
PP
1222 do { /* DCL$PATH may be a search list */
1223 while (1) { /* as may dev portion of any element */
1224 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1225 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1226 cando_by_name(S_IWUSR,0,elt) ) {
1227 MgTAINTEDDIR_on(mg);
1228 return 0;
1229 }
1230 }
bd61b366 1231 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1232 *cp = '\0';
1233 if (my_trnlnm(elt, eltbuf, j++))
1234 elt = eltbuf;
1235 else
1236 break;
1237 }
1238 j = 0;
1239 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1240 }
1241#endif /* VMS */
b2aed775 1242 if (s && memEQs(key, klen, "PATH")) {
8772537c 1243 const char * const strend = s + len;
463ee0b2 1244
70b484a8
DM
1245 /* set MGf_TAINTEDDIR if any component of the new path is
1246 * relative or world-writeable */
463ee0b2 1247 while (s < strend) {
96827780 1248 char tmpbuf[256];
c623ac67 1249 Stat_t st;
5f74f29c 1250 I32 i;
83269ced
CB
1251#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1252 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1253#else
1254 const char path_sep = ':';
1255#endif
ba0a4150 1256 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1257 s, strend, path_sep, &i);
463ee0b2 1258 s++;
bb7a0f54 1259 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1260#ifdef __VMS
1261 /* no colon thus no device name -- assume relative path */
1262 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1263 /* Using Unix separator, e.g. under bash, so act line Unix */
1264 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1265#else
1266 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1267#endif
c6ed36e1 1268 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1269 MgTAINTEDDIR_on(mg);
1e422769
PP
1270 return 0;
1271 }
463ee0b2 1272 }
79072805
LW
1273 }
1274 }
28542d8f 1275#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1276
79072805
LW
1277 return 0;
1278}
1279
1280int
864dbfa3 1281Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1282{
7918f24d 1283 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1284 PERL_UNUSED_ARG(sv);
bd61b366 1285 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1286 return 0;
1287}
1288
88e89b8a 1289int
864dbfa3 1290Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1291{
7918f24d 1292 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1293 PERL_UNUSED_ARG(mg);
b0269e46 1294#if defined(VMS)
cea2e8a9 1295 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1296#else
3280af22 1297 if (PL_localizing) {
fb73857a 1298 HE* entry;
b0269e46 1299 my_clearenv();
85fbaab2
NC
1300 hv_iterinit(MUTABLE_HV(sv));
1301 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1302 I32 keylen;
1303 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1304 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1305 }
1306 }
1307#endif
1308 return 0;
1309}
1310
1311int
864dbfa3 1312Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1313{
7918f24d 1314 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1315 PERL_UNUSED_ARG(sv);
1316 PERL_UNUSED_ARG(mg);
b0269e46
AB
1317#if defined(VMS)
1318 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1319#else
1320 my_clearenv();
1321#endif
3e3baf6d 1322 return 0;
66b1d557
HM
1323}
1324
64ca3a65 1325#ifndef PERL_MICRO
2d4fcd5e
AJ
1326#ifdef HAS_SIGPROCMASK
1327static void
1328restore_sigmask(pTHX_ SV *save_sv)
1329{
0bd48802 1330 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1331 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1332}
1333#endif
66b1d557 1334int
864dbfa3 1335Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1336{
88e89b8a 1337 /* Are we fetching a signal entry? */
708854f2 1338 int i = (I16)mg->mg_private;
7918f24d
NC
1339
1340 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1341
708854f2 1342 if (!i) {
84c7b88c
BF
1343 STRLEN siglen;
1344 const char * sig = MgPV_const(mg, siglen);
1345 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1346 }
1347
e02bfb16 1348 if (i > 0) {
22c35a8c
GS
1349 if(PL_psig_ptr[i])
1350 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1351 else {
46da273f 1352 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1353#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1354 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1355 sigstate = SIG_IGN;
2e34cc90
CL
1356#endif
1357#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1358 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1359 sigstate = SIG_DFL;
85b332e2 1360#endif
88e89b8a 1361 /* cache state so we don't fetch it again */
8aad04aa 1362 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1363 sv_setpvs(sv,"IGNORE");
88e89b8a 1364 else
e03e82a0 1365 sv_set_undef(sv);
46da273f 1366 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1367 SvTEMP_off(sv);
1368 }
1369 }
1370 return 0;
1371}
1372int
864dbfa3 1373Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1374{
7918f24d 1375 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1376
38a124f0 1377 magic_setsig(NULL, mg);
179c85a2 1378 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1379}
3d37d572 1380
0a8e0eff 1381Signal_t
8aad04aa 1382#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1383Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1384#else
0a8e0eff 1385Perl_csighandler(int sig)
8aad04aa 1386#endif
0a8e0eff 1387{
1018e26f
NIS
1388#ifdef PERL_GET_SIG_CONTEXT
1389 dTHXa(PERL_GET_SIG_CONTEXT);
1390#else
85b332e2
CL
1391 dTHX;
1392#endif
1271a1be 1393#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1394#if defined(__cplusplus) && defined(__GNUC__)
1395 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1396 * parameters would be warned about. */
1397 PERL_UNUSED_ARG(sip);
1398 PERL_UNUSED_ARG(uap);
1399#endif
1271a1be 1400#endif
23ada85b 1401#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1402 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1403 if (PL_sig_ignoring[sig]) return;
85b332e2 1404#endif
2e34cc90 1405#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1406 if (PL_sig_defaulting[sig])
2e34cc90
CL
1407#ifdef KILL_BY_SIGPRC
1408 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1409#else
1410 exit(1);
1411#endif
1412#endif
406878dd 1413 if (
853d2c32
RGS
1414#ifdef SIGILL
1415 sig == SIGILL ||
1416#endif
1417#ifdef SIGBUS
1418 sig == SIGBUS ||
1419#endif
1420#ifdef SIGSEGV
1421 sig == SIGSEGV ||
1422#endif
1423 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1424 /* Call the perl level handler now--
31c91b43 1425 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1426#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1427 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1428#else
1429 (*PL_sighandlerp)(sig);
92807b6d 1430#endif
406878dd 1431 else {
31c91b43 1432 if (!PL_psig_pend) return;
406878dd
GA
1433 /* Set a flag to say this signal is pending, that is awaiting delivery after
1434 * the current Perl opcode completes */
1435 PL_psig_pend[sig]++;
1436
1437#ifndef SIG_PENDING_DIE_COUNT
1438# define SIG_PENDING_DIE_COUNT 120
1439#endif
fe13d51d 1440 /* Add one to say _a_ signal is pending */
406878dd
GA
1441 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1442 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1443 (unsigned long)SIG_PENDING_DIE_COUNT);
1444 }
0a8e0eff
NIS
1445}
1446
2e34cc90
CL
1447#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1448void
1449Perl_csighandler_init(void)
1450{
1451 int sig;
27da23d5 1452 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1453
1454 for (sig = 1; sig < SIG_SIZE; sig++) {
1455#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1456 dTHX;
27da23d5 1457 PL_sig_defaulting[sig] = 1;
5c1546dc 1458 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1459#endif
1460#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1461 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1462#endif
1463 }
27da23d5 1464 PL_sig_handlers_initted = 1;
2e34cc90
CL
1465}
1466#endif
1467
7fe50b8b
LT
1468#if defined HAS_SIGPROCMASK
1469static void
1470unblock_sigmask(pTHX_ void* newset)
1471{
dc3bf405 1472 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1473 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1474}
1475#endif
1476
0a8e0eff
NIS
1477void
1478Perl_despatch_signals(pTHX)
1479{
1480 int sig;
1481 PL_sig_pending = 0;
1482 for (sig = 1; sig < SIG_SIZE; sig++) {
1483 if (PL_psig_pend[sig]) {
d0166017 1484 dSAVE_ERRNO;
7fe50b8b 1485#ifdef HAS_SIGPROCMASK
55534442
LT
1486 /* From sigaction(2) (FreeBSD man page):
1487 * | Signal routines normally execute with the signal that
1488 * | caused their invocation blocked, but other signals may
1489 * | yet occur.
1490 * Emulation of this behavior (from within Perl) is enabled
1491 * using sigprocmask
1492 */
1493 int was_blocked;
1494 sigset_t newset, oldset;
1495
1496 sigemptyset(&newset);
1497 sigaddset(&newset, sig);
1498 sigprocmask(SIG_BLOCK, &newset, &oldset);
1499 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1500 if (!was_blocked) {
1501 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1502 ENTER;
1503 SAVEFREESV(save_sv);
1504 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1505 }
55534442 1506#endif
25da4428 1507 PL_psig_pend[sig] = 0;
6e324d09 1508#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1509 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1510#else
1511 (*PL_sighandlerp)(sig);
92807b6d 1512#endif
7fe50b8b 1513#ifdef HAS_SIGPROCMASK
55534442 1514 if (!was_blocked)
7fe50b8b 1515 LEAVE;
55534442 1516#endif
d0166017 1517 RESTORE_ERRNO;
0a8e0eff
NIS
1518 }
1519 }
1520}
1521
38a124f0 1522/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1523int
864dbfa3 1524Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1525{
27da23d5 1526 dVAR;
79072805 1527 I32 i;
cbbf8932 1528 SV** svp = NULL;
2d4fcd5e
AJ
1529 /* Need to be careful with SvREFCNT_dec(), because that can have side
1530 * effects (due to closures). We must make sure that the new disposition
1531 * is in place before it is called.
1532 */
cbbf8932 1533 SV* to_dec = NULL;
e72dc28c 1534 STRLEN len;
2d4fcd5e
AJ
1535#ifdef HAS_SIGPROCMASK
1536 sigset_t set, save;
1537 SV* save_sv;
1538#endif
eb578fdb 1539 const char *s = MgPV_const(mg,len);
7918f24d
NC
1540
1541 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1542
748a9306 1543 if (*s == '_') {
84c7b88c 1544 if (memEQs(s, len, "__DIE__"))
3280af22 1545 svp = &PL_diehook;
84c7b88c 1546 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1547 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1548 /* Merge the existing behaviours, which are as follows:
1549 magic_setsig, we always set svp to &PL_warnhook
1550 (hence we always change the warnings handler)
1551 For magic_clearsig, we don't change the warnings handler if it's
1552 set to the &PL_warnhook. */
3280af22 1553 svp = &PL_warnhook;
84c7b88c
BF
1554 } else if (sv) {
1555 SV *tmp = sv_newmortal();
1556 Perl_croak(aTHX_ "No such hook: %s",
1557 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1558 }
748a9306 1559 i = 0;
38a124f0 1560 if (svp && *svp) {
9289f461
RGS
1561 if (*svp != PERL_WARNHOOK_FATAL)
1562 to_dec = *svp;
cbbf8932 1563 *svp = NULL;
4633a7c4 1564 }
748a9306
LW
1565 }
1566 else {
708854f2
NC
1567 i = (I16)mg->mg_private;
1568 if (!i) {
84c7b88c 1569 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1570 mg->mg_private = (U16)i;
708854f2 1571 }
86d86cad 1572 if (i <= 0) {
84c7b88c
BF
1573 if (sv) {
1574 SV *tmp = sv_newmortal();
1575 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1576 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1577 }
748a9306
LW
1578 return 0;
1579 }
2d4fcd5e
AJ
1580#ifdef HAS_SIGPROCMASK
1581 /* Avoid having the signal arrive at a bad time, if possible. */
1582 sigemptyset(&set);
1583 sigaddset(&set,i);
1584 sigprocmask(SIG_BLOCK, &set, &save);
1585 ENTER;
9ff8e806 1586 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1587 SAVEFREESV(save_sv);
1588 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1589#endif
1590 PERL_ASYNC_CHECK();
2e34cc90 1591#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1592 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1593#endif
23ada85b 1594#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1595 PL_sig_ignoring[i] = 0;
85b332e2 1596#endif
2e34cc90 1597#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1598 PL_sig_defaulting[i] = 0;
2e34cc90 1599#endif
2d4fcd5e 1600 to_dec = PL_psig_ptr[i];
38a124f0
NC
1601 if (sv) {
1602 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1603 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1604
1605 /* Signals don't change name during the program's execution, so once
1606 they're cached in the appropriate slot of PL_psig_name, they can
1607 stay there.
1608
1609 Ideally we'd find some way of making SVs at (C) compile time, or
1610 at least, doing most of the work. */
1611 if (!PL_psig_name[i]) {
1612 PL_psig_name[i] = newSVpvn(s, len);
1613 SvREADONLY_on(PL_psig_name[i]);
1614 }
38a124f0 1615 } else {
79fd3822 1616 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1617 PL_psig_name[i] = NULL;
1618 PL_psig_ptr[i] = NULL;
1619 }
748a9306 1620 }
38a124f0 1621 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1622 if (i) {
5c1546dc 1623 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1624 }
748a9306 1625 else
b37c2d43 1626 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1627 } else {
9dfa190b
NC
1628 if (sv && SvOK(sv)) {
1629 s = SvPV_force(sv, len);
1630 } else {
1631 sv = NULL;
1632 }
84c7b88c 1633 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1634 if (i) {
23ada85b 1635#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1636 PL_sig_ignoring[i] = 1;
1637 (void)rsignal(i, PL_csighandlerp);
85b332e2 1638#else
9dfa190b 1639 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1640#endif
9dfa190b 1641 }
2d4fcd5e 1642 }
84c7b88c 1643 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1644 if (i) {
2e34cc90 1645#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1646 PL_sig_defaulting[i] = 1;
1647 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1648#else
9dfa190b 1649 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1650#endif
9dfa190b
NC
1651 }
1652 }
1653 else {
1654 /*
1655 * We should warn if HINT_STRICT_REFS, but without
1656 * access to a known hint bit in a known OP, we can't
1657 * tell whether HINT_STRICT_REFS is in force or not.
1658 */
1659 if (!strchr(s,':') && !strchr(s,'\''))
1660 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1661 SV_GMAGIC);
1662 if (i)
1663 (void)rsignal(i, PL_csighandlerp);
1664 else
1665 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1666 }
748a9306 1667 }
9dfa190b 1668
2d4fcd5e
AJ
1669#ifdef HAS_SIGPROCMASK
1670 if(i)
1671 LEAVE;
1672#endif
ef8d46e8 1673 SvREFCNT_dec(to_dec);
79072805
LW
1674 return 0;
1675}
64ca3a65 1676#endif /* !PERL_MICRO */
79072805
LW
1677
1678int
864dbfa3 1679Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1680{
7918f24d 1681 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1682 PERL_UNUSED_ARG(sv);
e1a479c5 1683
89c14e2e 1684 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1685 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1686 return 0;
1687
0e446081 1688 return magic_clearisa(NULL, mg);
463ee0b2
LW
1689}
1690
0e446081 1691/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1692int
52b45067
RD
1693Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1694{
52b45067 1695 HV* stash;
7918f24d
NC
1696 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1697
52b45067 1698 /* Bail out if destruction is going on */
627364f1 1699 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1700
0e446081
NC
1701 if (sv)
1702 av_clear(MUTABLE_AV(sv));
52b45067 1703
6624142a
FC
1704 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1705 /* This occurs with setisa_elem magic, which calls this
1706 same function. */
1707 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1708
316ebaf2 1709 assert(mg);
6624142a
FC
1710 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1711 SV **svp = AvARRAY((AV *)mg->mg_obj);
1712 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1713 while (items--) {
1714 stash = GvSTASH((GV *)*svp++);
1715 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1716 }
1717
1718 return 0;
1719 }
1720
52b45067 1721 stash = GvSTASH(
6624142a 1722 (const GV *)mg->mg_obj
52b45067
RD
1723 );
1724
00169e2c
FC
1725 /* The stash may have been detached from the symbol table, so check its
1726 name before doing anything. */
1727 if (stash && HvENAME_get(stash))
5562fa71 1728 mro_isa_changed_in(stash);
52b45067
RD
1729
1730 return 0;
1731}
1732
1733int
864dbfa3 1734Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1735{
85fbaab2 1736 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1737 I32 i = 0;
7918f24d
NC
1738
1739 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1740 PERL_UNUSED_ARG(mg);
7719e241 1741
6ff81951 1742 if (hv) {
497b47a8 1743 (void) hv_iterinit(hv);
ad64d0ec 1744 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1745 i = HvUSEDKEYS(hv);
497b47a8
JH
1746 else {
1747 while (hv_iternext(hv))
1748 i++;
1749 }
6ff81951
GS
1750 }
1751
1752 sv_setiv(sv, (IV)i);
1753 return 0;
1754}
1755
1756int
864dbfa3 1757Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1758{
7918f24d 1759 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1760 PERL_UNUSED_ARG(mg);
946ec16e 1761 if (LvTARG(sv)) {
85fbaab2 1762 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1763 }
1764 return 0;
ac27b0f5 1765}
946ec16e 1766
efaf3674
DM
1767/*
1768=for apidoc magic_methcall
1769
1770Invoke a magic method (like FETCH).
1771
2baee27b
FC
1772C<sv> and C<mg> are the tied thingy and the tie magic.
1773
1774C<meth> is the name of the method to call.
1775
1776C<argc> is the number of args (in addition to $self) to pass to the method.
1777
1778The C<flags> can be:
1779
1780 G_DISCARD invoke method with G_DISCARD flag and don't
1781 return a value
1782 G_UNDEF_FILL fill the stack with argc pointers to
1783 PL_sv_undef
1784
1785The arguments themselves are any values following the C<flags> argument.
efaf3674 1786
796b6530 1787Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1788
1789
1790=cut
1791*/
1792
1793SV*
36925d9e 1794Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1795 U32 argc, ...)
a0d0e21e
LW
1796{
1797 dSP;
efaf3674 1798 SV* ret = NULL;
463ee0b2 1799
7918f24d
NC
1800 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1801
efaf3674 1802 ENTER;
d1d7a15d
NC
1803
1804 if (flags & G_WRITING_TO_STDERR) {
1805 SAVETMPS;
1806
2782061f 1807 save_re_context();
d1d7a15d
NC
1808 SAVESPTR(PL_stderrgv);
1809 PL_stderrgv = NULL;
1810 }
1811
efaf3674 1812 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1813 PUSHMARK(SP);
efaf3674 1814
052a7c76
DM
1815 /* EXTEND() expects a signed argc; don't wrap when casting */
1816 assert(argc <= I32_MAX);
1817 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1818 PUSHs(SvTIED_obj(sv, mg));
1819 if (flags & G_UNDEF_FILL) {
1820 while (argc--) {
efaf3674 1821 PUSHs(&PL_sv_undef);
93965878 1822 }
67549bd2 1823 } else if (argc > 0) {
046b0c7d
NC
1824 va_list args;
1825 va_start(args, argc);
1826
1827 do {
1828 SV *const sv = va_arg(args, SV *);
1829 PUSHs(sv);
1830 } while (--argc);
1831
1832 va_end(args);
88e89b8a 1833 }
463ee0b2 1834 PUTBACK;
efaf3674 1835 if (flags & G_DISCARD) {
36925d9e 1836 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1837 }
1838 else {
36925d9e 1839 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1840 ret = *PL_stack_sp--;
1841 }
1842 POPSTACK;
d1d7a15d
NC
1843 if (flags & G_WRITING_TO_STDERR)
1844 FREETMPS;
efaf3674
DM
1845 LEAVE;
1846 return ret;
1847}
1848
efaf3674 1849/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1850
efaf3674 1851STATIC SV*
36925d9e 1852S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1853 int n, SV *val)
1854{
efaf3674
DM
1855 SV* arg1 = NULL;
1856
1857 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1858
1859 if (mg->mg_ptr) {
1860 if (mg->mg_len >= 0) {
db4b3a1d 1861 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1862 }
1863 else if (mg->mg_len == HEf_SVKEY)
1864 arg1 = MUTABLE_SV(mg->mg_ptr);
1865 }
1866 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1867 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1868 sv_2mortal(arg1);
1869 }
1870 if (!arg1) {
046b0c7d 1871 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1872 }
046b0c7d 1873 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1874}
1875
76e3520e 1876STATIC int
36925d9e 1877S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1878{
efaf3674 1879 SV* ret;
463ee0b2 1880
7918f24d
NC
1881 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1882
efaf3674
DM
1883 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1884 if (ret)
1885 sv_setsv(sv, ret);
a0d0e21e
LW
1886 return 0;
1887}
463ee0b2 1888
a0d0e21e 1889int
864dbfa3 1890Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1891{
7918f24d
NC
1892 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1893
fd69380d 1894 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1895 mg->mg_flags |= MGf_GSKIP;
36925d9e 1896 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1897 return 0;
1898}
1899
1900int
864dbfa3 1901Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1902{
b112cff9
DM
1903 MAGIC *tmg;
1904 SV *val;
7918f24d
NC
1905
1906 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1907
b112cff9
DM
1908 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1909 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1910 * public flags indicate its value based on copying from $val. Doing
1911 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1912 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1913 * wrong if $val happened to be tainted, as sv hasn't got magic
1914 * enabled, even though taint magic is in the chain. In which case,
1915 * fake up a temporary tainted value (this is easier than temporarily
1916 * re-enabling magic on sv). */
1917
284167a5 1918 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1919 && (tmg->mg_len & 1))
1920 {
1921 val = sv_mortalcopy(sv);
1922 SvTAINTED_on(val);
1923 }
1924 else
1925 val = sv;
1926
36925d9e 1927 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1928 return 0;
1929}
1930
1931int
864dbfa3 1932Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1933{
7918f24d
NC
1934 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1935
4c13be3f 1936 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1937 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1938}
463ee0b2 1939
93965878
NIS
1940
1941U32
864dbfa3 1942Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1943{
22846ab4 1944 I32 retval = 0;
efaf3674 1945 SV* retsv;
93965878 1946
7918f24d
NC
1947 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1948
36925d9e 1949 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1950 if (retsv) {
1951 retval = SvIV(retsv)-1;
22846ab4
AB
1952 if (retval < -1)
1953 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1954 }
22846ab4 1955 return (U32) retval;
93965878
NIS
1956}
1957
cea2e8a9
GS
1958int
1959Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1960{
7918f24d
NC
1961 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1962
36925d9e 1963 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1964 return 0;
1965}
1966
1967int
864dbfa3 1968Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1969{
efaf3674 1970 SV* ret;
463ee0b2 1971
7918f24d
NC
1972 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1973
36925d9e
RZ
1974 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1975 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1976 if (ret)
1977 sv_setsv(key,ret);
79072805
LW
1978 return 0;
1979}
1980
1981int
1146e912 1982Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1983{
7918f24d
NC
1984 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1985
36925d9e 1986 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1987}
a0d0e21e 1988
a3bcc51e
TP
1989SV *
1990Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1991{
5fcbf73d 1992 SV *retval;
ad64d0ec
NC
1993 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1994 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1995
7918f24d
NC
1996 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1997
a3bcc51e
TP
1998 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1999 SV *key;
bfcb3514 2000 if (HvEITER_get(hv))
a3bcc51e
TP
2001 /* we are in an iteration so the hash cannot be empty */
2002 return &PL_sv_yes;
2003 /* no xhv_eiter so now use FIRSTKEY */
2004 key = sv_newmortal();
ad64d0ec 2005 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2006 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2007 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2008 }
2009
2010 /* there is a SCALAR method that we can call */
36925d9e 2011 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2012 if (!retval)
5fcbf73d 2013 retval = &PL_sv_undef;
a3bcc51e
TP
2014 return retval;
2015}
2016
a0d0e21e 2017int
864dbfa3 2018Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2019{
089b5c60 2020 SV **svp;
7918f24d
NC
2021
2022 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2023
089b5c60
NC
2024 /* The magic ptr/len for the debugger's hash should always be an SV. */
2025 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2026 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2027 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2028 }
2029
2030 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2031 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2032 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2033 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2034
8772537c 2035 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2036 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2037 if (o) {
2038#ifdef PERL_DEBUG_READONLY_OPS
2039 Slab_to_rw(OpSLAB(o));
2040#endif
2041 /* set or clear breakpoint in the relevant control op */
089b5c60 2042 if (SvTRUE(sv))
88df5f01 2043 o->op_flags |= OPf_SPECIAL;
8772537c 2044 else
88df5f01
FC
2045 o->op_flags &= ~OPf_SPECIAL;
2046#ifdef PERL_DEBUG_READONLY_OPS
2047 Slab_to_ro(OpSLAB(o));
2048#endif
8772537c 2049 }
5df8de69 2050 }
79072805
LW
2051 return 0;
2052}
2053
2054int
8772537c 2055Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2056{
502c6561 2057 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2058
2059 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2060
83bf042f 2061 if (obj) {
e1dccc0d 2062 sv_setiv(sv, AvFILL(obj));
83bf042f 2063 } else {
d4a823b3 2064 sv_setsv(sv, NULL);
83bf042f 2065 }
79072805
LW
2066 return 0;
2067}
2068
2069int
864dbfa3 2070Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2071{
502c6561 2072 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2073
2074 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2075
83bf042f 2076 if (obj) {
e1dccc0d 2077 av_fill(obj, SvIV(sv));
83bf042f 2078 } else {
a2a5de95
NC
2079 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2080 "Attempt to set length of freed array");
83bf042f
NC
2081 }
2082 return 0;
2083}
2084
2085int
83f29afa
VP
2086Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2087{
83f29afa
VP
2088 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2089 PERL_UNUSED_ARG(sv);
dc3bf405 2090 PERL_UNUSED_CONTEXT;
83f29afa
VP
2091
2092 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2093#if IVSIZE == I32SIZE
2094 *((IV *) &(mg->mg_len)) = 0;
2095#else
83f29afa
VP
2096 if (mg->mg_ptr)
2097 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2098#endif
83f29afa
VP
2099
2100 return 0;
2101}
2102
2103int
83bf042f
NC
2104Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2105{
7918f24d 2106 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2107 PERL_UNUSED_ARG(sv);
7918f24d 2108
94f3782b
DM
2109 /* during global destruction, mg_obj may already have been freed */
2110 if (PL_in_clean_all)
1ea47f64 2111 return 0;
94f3782b 2112
83bf042f
NC
2113 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2114
2115 if (mg) {
2116 /* arylen scalar holds a pointer back to the array, but doesn't own a
2117 reference. Hence the we (the array) are about to go away with it
2118 still pointing at us. Clear its pointer, else it would be pointing
2119 at free memory. See the comment in sv_magic about reference loops,
2120 and why it can't own a reference to us. */
2121 mg->mg_obj = 0;
2122 }
a0d0e21e
LW
2123 return 0;
2124}
2125
2126int
864dbfa3 2127Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2128{
16eb5365 2129 SV* const lsv = LvTARG(sv);
96c2a8ff 2130 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2131
2132 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2133 PERL_UNUSED_ARG(mg);
ac27b0f5 2134
6174b39a
FC
2135 if (found && found->mg_len != -1) {
2136 STRLEN i = found->mg_len;
25fdce4a 2137 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2138 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2139 sv_setuv(sv, i);
a0d0e21e 2140 return 0;
a0d0e21e 2141 }
35995e5c 2142 sv_setsv(sv,NULL);
a0d0e21e
LW
2143 return 0;
2144}
2145
2146int
864dbfa3 2147Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2148{
16eb5365 2149 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2150 SSize_t pos;
2151 STRLEN len;
53d44271 2152 MAGIC* found;
aec43834 2153 const char *s;
a0d0e21e 2154
7918f24d 2155 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2156 PERL_UNUSED_ARG(mg);
ac27b0f5 2157
96c2a8ff 2158 found = mg_find_mglob(lsv);
3881461a 2159 if (!found) {
a0d0e21e
LW
2160 if (!SvOK(sv))
2161 return 0;
96c2a8ff 2162 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2163 }
2164 else if (!SvOK(sv)) {
3881461a 2165 found->mg_len = -1;
a0d0e21e
LW
2166 return 0;
2167 }
aec43834 2168 s = SvPV_const(lsv, len);
a0d0e21e 2169
e1dccc0d 2170 pos = SvIV(sv);
a0ed51b3 2171
7e2040f0 2172 if (DO_UTF8(lsv)) {
19742f39 2173 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2174 if (ulen)
2175 len = ulen;
a0ed51b3
LW
2176 }
2177
a0d0e21e
LW
2178 if (pos < 0) {
2179 pos += len;
2180 if (pos < 0)
2181 pos = 0;
2182 }
eb160463 2183 else if (pos > (SSize_t)len)
a0d0e21e 2184 pos = len;
a0ed51b3 2185
3881461a 2186 found->mg_len = pos;
25fdce4a 2187 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2188
79072805
LW
2189 return 0;
2190}
2191
2192int
864dbfa3 2193Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2194{
2195 STRLEN len;
35a4481c 2196 SV * const lsv = LvTARG(sv);
b83604b4 2197 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2198 STRLEN offs = LvTARGOFF(sv);
2199 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2200 const bool negoff = LvFLAGS(sv) & 1;
2201 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2202
2203 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2204 PERL_UNUSED_ARG(mg);
6ff81951 2205
83f78d1a 2206 if (!translate_substr_offsets(
4ddea69a 2207 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2208 negoff ? -(IV)offs : (IV)offs, !negoff,
2209 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2210 )) {
2211 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2212 sv_set_undef(sv);
83f78d1a
FC
2213 return 0;
2214 }
2215
9aa983d2 2216 if (SvUTF8(lsv))
4ddea69a 2217 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2218 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2219 if (SvUTF8(lsv))
2ef4b674 2220 SvUTF8_on(sv);
6ff81951
GS
2221 return 0;
2222}
2223
2224int
864dbfa3 2225Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2226{
83f78d1a 2227 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2228 const char * const tmps = SvPV_const(sv, len);
dd374669 2229 SV * const lsv = LvTARG(sv);
777f7c56
EB
2230 STRLEN lvoff = LvTARGOFF(sv);
2231 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2232 const bool negoff = LvFLAGS(sv) & 1;
2233 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2234
2235 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2236 PERL_UNUSED_ARG(mg);
075a4a2b 2237
a74fb2cd
FC
2238 SvGETMAGIC(lsv);
2239 if (SvROK(lsv))
2240 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2241 "Attempt to use reference as lvalue in substr"
2242 );
fc061ed8
FC
2243 SvPV_force_nomg(lsv,lsv_len);
2244 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2245 if (!translate_substr_offsets(
2246 lsv_len,
2247 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2248 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2249 ))
2250 Perl_croak(aTHX_ "substr outside of string");
2251 oldtarglen = lvlen;
1aa99e6b 2252 if (DO_UTF8(sv)) {
73a087f0 2253 sv_utf8_upgrade_nomg(lsv);
d931b1be 2254 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2255 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2256 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2257 SvUTF8_on(lsv);
2258 }
0d336106 2259 else if (SvUTF8(lsv)) {
5fcbf73d 2260 const char *utf8;
d931b1be 2261 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2262 newtarglen = len;
5fcbf73d 2263 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2264 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2265 Safefree(utf8);
1aa99e6b 2266 }
b76f3ce2 2267 else {
a74fb2cd 2268 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2269 newtarglen = len;
b76f3ce2 2270 }
83f78d1a
FC
2271 if (!neglen) LvTARGLEN(sv) = newtarglen;
2272 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2273
79072805
LW
2274 return 0;
2275}
2276
2277int
864dbfa3 2278Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2279{
7918f24d 2280 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2281 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2282#ifdef NO_TAINT_SUPPORT
2283 PERL_UNUSED_ARG(mg);
2284#endif
7918f24d 2285
64ff300b 2286 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2287 return 0;
2288}
2289
2290int
864dbfa3 2291Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2292{
7918f24d 2293 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2294 PERL_UNUSED_ARG(sv);
7918f24d 2295
b01e650a 2296 /* update taint status */
284167a5 2297 if (TAINT_get)
b01e650a
DM
2298 mg->mg_len |= 1;
2299 else
2300 mg->mg_len &= ~1;
463ee0b2
LW
2301 return 0;
2302}
2303
2304int
864dbfa3 2305Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2306{
35a4481c 2307 SV * const lsv = LvTARG(sv);
1b92e694 2308 char errflags = LvFLAGS(sv);
7918f24d
NC
2309
2310 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2311 PERL_UNUSED_ARG(mg);
6ff81951 2312
1b92e694
DM
2313 /* non-zero errflags implies deferred out-of-range condition */
2314 assert(!(errflags & ~(1|4)));
2315 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2316
6ff81951
GS
2317 return 0;
2318}
2319
2320int
864dbfa3 2321Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2322{
7918f24d 2323 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2324 PERL_UNUSED_ARG(mg);
79072805
LW
2325 do_vecset(sv); /* XXX slurp this routine */
2326 return 0;
2327}
2328
13733cde
FC
2329SV *
2330Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2331{
a0714e2c 2332 SV *targ = NULL;
13733cde
FC
2333 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2334 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2335 assert(mg);
5f05dabc 2336 if (LvTARGLEN(sv)) {
68dc0745 2337 if (mg->mg_obj) {
8772537c 2338 SV * const ahv = LvTARG(sv);
85fbaab2 2339 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2340 if (he)
2341 targ = HeVAL(he);
68dc0745 2342 }
bbfdc870 2343 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2344 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2345 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2346 {
2347 if (SvRMAGICAL(av)) {
2348 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2349 targ = svp ? *svp : NULL;
2350 }
2351 else
bbfdc870 2352 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2353 }
68dc0745 2354 }
46da273f 2355 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2356 /* somebody else defined it for us */
2357 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2358 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2359 LvTARGLEN(sv) = 0;
2360 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2361 mg->mg_obj = NULL;
68dc0745
PP
2362 mg->mg_flags &= ~MGf_REFCOUNTED;
2363 }
13733cde 2364 return targ;
5f05dabc 2365 }
71be2cbc 2366 else
13733cde
FC
2367 return LvTARG(sv);
2368}
2369
2370int
2371Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2372{
2373 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2374
2375 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2376 return 0;
2377}
2378
2379int
864dbfa3 2380Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2381{
7918f24d 2382 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2383 PERL_UNUSED_ARG(mg);
71be2cbc 2384 if (LvTARGLEN(sv))
68dc0745
PP
2385 vivify_defelem(sv);
2386 if (LvTARG(sv)) {
5f05dabc 2387 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2388 SvSETMAGIC(LvTARG(sv));
2389 }
5f05dabc
PP
2390 return 0;
2391}
2392
71be2cbc 2393void
864dbfa3 2394Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2395{
74e13ce4 2396 MAGIC *mg;
a0714e2c 2397 SV *value = NULL;
71be2cbc 2398
7918f24d
NC
2399 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2400
14befaf4 2401 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2402 return;
68dc0745 2403 if (mg->mg_obj) {
8772537c 2404 SV * const ahv = LvTARG(sv);
85fbaab2 2405 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2406 if (he)
2407 value = HeVAL(he);
3280af22 2408 if (!value || value == &PL_sv_undef)
be2597df 2409 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2410 }
bbfdc870
FC
2411 else if (LvSTARGOFF(sv) < 0)
2412 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2413 else {
502c6561 2414 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2415 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2416 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2417 else {
bbfdc870 2418 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2419 if (!svp || !(value = *svp))
bbfdc870 2420 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2421 }
2422 }
b37c2d43 2423 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2424 SvREFCNT_dec(LvTARG(sv));
2425 LvTARG(sv) = value;
71be2cbc 2426 LvTARGLEN(sv) = 0;
68dc0745 2427 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2428 mg->mg_obj = NULL;
68dc0745 2429 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2430}
2431
2432int
864dbfa3 2433Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2434{
7918f24d 2435 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2436 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2437 return 0;
810b8aa5
GS
2438}
2439
2440int
864dbfa3 2441Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2442{
7918f24d 2443 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2444 PERL_UNUSED_CONTEXT;
0177730e 2445 PERL_UNUSED_ARG(sv);
565764a8 2446 mg->mg_len = -1;
93a17b20
LW
2447 return 0;
2448}
2449
2450int
864dbfa3 2451Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2452{
35a4481c 2453 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2454
7918f24d
NC
2455 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2456
79072805 2457 if (uf && uf->uf_set)
24f81a43 2458 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2459 return 0;
2460}
2461
c277df42 2462int
faf82a0b
AE
2463Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2464{
488344d2 2465 const char type = mg->mg_type;
7918f24d
NC
2466
2467 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2468
a5c7cb08
DM
2469 assert( type == PERL_MAGIC_fm
2470 || type == PERL_MAGIC_qr
2471 || type == PERL_MAGIC_bm);
488344d2 2472 return sv_unmagic(sv, type);
faf82a0b
AE
2473}
2474
7a4c00b4 2475#ifdef USE_LOCALE_COLLATE
79072805 2476int
864dbfa3 2477Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2478{
7918f24d
NC
2479 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2480
bbce6d69 2481 /*
838b5b74 2482 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2483 * and vanished with a faint plop.
2484 */
96a5add6 2485 PERL_UNUSED_CONTEXT;
8772537c 2486 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2487 if (mg->mg_ptr) {
2488 Safefree(mg->mg_ptr);
2489 mg->mg_ptr = NULL;
565764a8 2490 mg->mg_len = -1;
7a4c00b4 2491 }
bbce6d69
PP
2492 return 0;
2493}
7a4c00b4 2494#endif /* USE_LOCALE_COLLATE */
bbce6d69 2495
7e8c5dac
HS
2496/* Just clear the UTF-8 cache data. */
2497int
2498Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2499{
7918f24d 2500 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2501 PERL_UNUSED_CONTEXT;
8772537c 2502 PERL_UNUSED_ARG(sv);
7e8c5dac 2503 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2504 mg->mg_ptr = NULL;
7e8c5dac
HS
2505 mg->mg_len = -1; /* The mg_len holds the len cache. */
2506 return 0;
2507}
2508
bbce6d69 2509int
9cce4f9a
FC
2510Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2511{
9782ce69 2512 const char *bad = NULL;
9cce4f9a 2513 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2514 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2515 switch (mg->mg_private & OPpLVREF_TYPE) {
2516 case OPpLVREF_SV:
2517 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2518 bad = " SCALAR";
2519 break;
2520 case OPpLVREF_AV:
2521 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2522 bad = "n ARRAY";
2523 break;
2524 case OPpLVREF_HV:
2525 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2526 bad = " HASH";
2527 break;
2528 case OPpLVREF_CV:
2529 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2530 bad = " CODE";
2531 }
2532 if (bad)
26a50d99 2533 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2534 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2535 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2536 case 0:
2537 {
2538 SV * const old = PAD_SV(mg->mg_len);
2539 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2540 SvREFCNT_dec(old);
2541 break;
2542 }
2543 case SVt_PVGV:
2544 gv_setref(mg->mg_obj, sv);
2545 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2546 break;
2547 case SVt_PVAV:
2548 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2549 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2550 break;
2551 case SVt_PVHV:
7fcb36d5
JH
2552 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2553 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2554 }
d39c26a6
FC
2555 if (mg->mg_flags & MGf_PERSIST)
2556 NOOP; /* This sv is in use as an iterator var and will be reused,
2557 so we must leave the magic. */
2558 else
2559 /* This sv could be returned by the assignment op, so clear the
2560 magic, as lvrefs are an implementation detail that must not be
2561 leaked to the user. */
2562 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2563 return 0;
2564}
2565
f1540bed
JH
2566static void
2567S_set_dollarzero(pTHX_ SV *sv)
2568 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2569{
2570#ifdef USE_ITHREADS
2571 dVAR;
2572#endif
2573 const char *s;
2574 STRLEN len;
f1540bed
JH
2575#ifdef HAS_SETPROCTITLE
2576 /* The BSDs don't show the argv[] in ps(1) output, they
2577 * show a string from the process struct and provide
2578 * the setproctitle() routine to manipulate that. */
2579 if (PL_origalen != 1) {
2580 s = SvPV_const(sv, len);
38626956 2581# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2582 /* The leading "-" removes the "perl: " prefix,
2583 * but not the "(perl) suffix from the ps(1)
2584 * output, because that's what ps(1) shows if the
2585 * argv[] is modified. */
2586 setproctitle("-%s", s);
2587# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2588 /* This doesn't really work if you assume that
2589 * $0 = 'foobar'; will wipe out 'perl' from the $0
2590 * because in ps(1) output the result will be like
2591 * sprintf("perl: %s (perl)", s)
2592 * I guess this is a security feature:
2593 * one (a user process) cannot get rid of the original name.
2594 * --jhi */
2595 setproctitle("%s", s);
2596# endif
2597 }
2598#elif defined(__hpux) && defined(PSTAT_SETCMD)
2599 if (PL_origalen != 1) {
2600 union pstun un;
2601 s = SvPV_const(sv, len);
2602 un.pst_command = (char *)s;
2603 pstat(PSTAT_SETCMD, un, len, 0, 0);
2604 }
2605#else
2606 if (PL_origalen > 1) {
4f3e04fd 2607 I32 i;
f1540bed
JH
2608 /* PL_origalen is set in perl_parse(). */
2609 s = SvPV_force(sv,len);
2610 if (len >= (STRLEN)PL_origalen-1) {
2611 /* Longer than original, will be truncated. We assume that
2612 * PL_origalen bytes are available. */
2613 Copy(s, PL_origargv[0], PL_origalen-1, char);
2614 }
2615 else {
2616 /* Shorter than original, will be padded. */
2617#ifdef PERL_DARWIN
2618 /* Special case for Mac OS X: see [perl #38868] */
2619 const int pad = 0;
2620#else
2621 /* Is the space counterintuitive? Yes.
2622 * (You were expecting \0?)
2623 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2624 * --jhi */
2625 const int pad = ' ';
2626#endif
2627 Copy(s, PL_origargv[0], len, char);
2628 PL_origargv[0][len] = 0;
2629 memset(PL_origargv[0] + len + 1,
2630 pad, PL_origalen - len - 1);
2631 }
2632 PL_origargv[0][PL_origalen-1] = 0;
2633 for (i = 1; i < PL_origargc; i++)
2634 PL_origargv[i] = 0;
2635#ifdef HAS_PRCTL_SET_NAME
2636 /* Set the legacy process name in addition to the POSIX name on Linux */
2637 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2638 /* diag_listed_as: SKIPME */
2639 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2640 }
2641#endif
2642 }
2643#endif
2644}
2645
9cce4f9a 2646int
864dbfa3 2647Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2648{
20b7effb 2649#ifdef USE_ITHREADS
97aff369 2650 dVAR;
20b7effb 2651#endif
eb578fdb
KW
2652 I32 paren;
2653 const REGEXP * rx;
79072805 2654 I32 i;
8990e307 2655 STRLEN len;
125b9982 2656 MAGIC *tmg;
2fdbfb4d 2657
7918f24d
NC
2658 PERL_ARGS_ASSERT_MAGIC_SET;
2659
e91d8259 2660 if (!mg->mg_ptr) {
960b831f 2661 paren = mg->mg_len;
1e05feb3 2662 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2663 setparen_got_rx:
2fdbfb4d 2664 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2665 } else {
2fdbfb4d
AB
2666 /* Croak with a READONLY error when a numbered match var is
2667 * set without a previous pattern match. Unless it's C<local $1>
2668 */
e91d8259 2669 croakparen:
2fdbfb4d 2670 if (!PL_localizing) {
cb077ed2 2671 Perl_croak_no_modify();
2fdbfb4d
AB
2672 }
2673 }
e91d8259
NC
2674 return 0;
2675 }
2676
2677 switch (*mg->mg_ptr) {
748a9306 2678 case '\001': /* ^A */
f2da823f
FC
2679 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2680 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2681 FmLINES(PL_bodytarget) = 0;
2682 if (SvPOK(PL_bodytarget)) {
2683 char *s = SvPVX(PL_bodytarget);
2684 while ( ((s = strchr(s, '\n'))) ) {
2685 FmLINES(PL_bodytarget)++;
2686 s++;
2687 }
2688 }
125b9982 2689 /* mg_set() has temporarily made sv non-magical */
284167a5 2690 if (TAINTING_get) {
125b9982
NT
2691 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2692 SvTAINTED_on(PL_bodytarget);
2693 else
2694 SvTAINTED_off(PL_bodytarget);
2695 }
748a9306 2696 break;
49460fe6 2697 case '\003': /* ^C */
f2338a2e 2698 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2699 break;
2700
79072805 2701 case '\004': /* ^D */
b4ab917c 2702#ifdef DEBUGGING
a9e2d2bf
DM
2703 {
2704 const char *s = SvPV_nolen_const(sv);
2705 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2706 if (DEBUG_x_TEST || DEBUG_B_TEST)
2707 dump_all_perl(!DEBUG_B_TEST);
2708 }
b4ab917c 2709#else
38ab35f8 2710 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2711#endif
79072805 2712 break;
28f23441 2713 case '\005': /* ^E */
d0063567 2714 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2715#ifdef VMS
38ab35f8 2716 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2717#else
2718# ifdef WIN32
d0063567 2719 SetLastError( SvIV(sv) );
e37778c2
NC
2720# else
2721# ifdef OS2
38ab35f8 2722 os2_setsyserrno(SvIV(sv));
e37778c2 2723# else
d0063567 2724 /* will anyone ever use this? */
38ab35f8 2725 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2726# endif
2727# endif
22fae026 2728#endif
d0063567 2729 }
3e669301 2730 else {
a15a3d9b 2731 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
d5b4785c 2732 if (PL_localizing != 2) {
ac641426
A
2733 deprecate_fatal_in("5.28",
2734 "${^ENCODING} is no longer supported");
d5b4785c 2735 }
3e669301 2736 }
d0063567 2737 break;
79072805 2738 case '\006': /* ^F */
38ab35f8 2739 PL_maxsysfd = SvIV(sv);
79072805 2740 break;
a0d0e21e 2741 case '\010': /* ^H */
efa571ab
KW
2742 {
2743 U32 save_hints = PL_hints;
5d382c25 2744 PL_hints = SvUV(sv);
efa571ab
KW
2745
2746 /* If wasn't UTF-8, and now is, notify the parser */
2747 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2748 notify_parser_that_changed_to_utf8();
2749 }
2750 }
a0d0e21e 2751 break;
9d116dd7 2752 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2753 Safefree(PL_inplace);
bd61b366 2754 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2755 break;
d9bad346
FC
2756 case '\016': /* ^N */
2757 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2758 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2759 goto croakparen;
28f23441 2760 case '\017': /* ^O */
ac27b0f5 2761 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2762 Safefree(PL_osname);
bd61b366 2763 PL_osname = NULL;
3511154c
DM
2764 if (SvOK(sv)) {
2765 TAINT_PROPER("assigning to $^O");
2e0de35c 2766 PL_osname = savesvpv(sv);
3511154c 2767 }
ac27b0f5
NIS
2768 }
2769 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2770 STRLEN len;
2771 const char *const start = SvPV(sv, len);
b54fc2b6 2772 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2773 SV *tmp;
8b850bd5
NC
2774
2775
2776 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2777 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2778
2779 /* Opening for input is more common than opening for output, so
2780 ensure that hints for input are sooner on linked list. */
59cd0e26 2781 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2782 SvUTF8(sv))
2783 : newSVpvs_flags("", SvUTF8(sv));
2784 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2785 mg_set(tmp);
8b850bd5 2786
f747ebd6
Z
2787 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2788 SvUTF8(sv));
2789 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2790 mg_set(tmp);
ac27b0f5 2791 }
28f23441 2792 break;
79072805 2793 case '\020': /* ^P */
2fdbfb4d
AB
2794 PL_perldb = SvIV(sv);
2795 if (PL_perldb && !PL_DBsingle)
2796 init_debugger();
9b9e0be4 2797 break;
79072805 2798 case '\024': /* ^T */
88e89b8a 2799#ifdef BIG_TIME
6b88bc9c 2800 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2801#else
38ab35f8 2802 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2803#endif
79072805 2804 break;
e07ea26a
NC
2805 case '\025': /* ^UTF8CACHE */
2806 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2807 PL_utf8cache = (signed char) sv_2iv(sv);
2808 }
2809 break;
fde18df1 2810 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2811 if (*(mg->mg_ptr+1) == '\0') {
2812 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2813 i = SvIV(sv);
ac27b0f5 2814 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2815 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2816 }
599cee73 2817 }
0a378802 2818 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2819 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2820 if (!SvPOK(sv)) {
2821 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2822 break;
2823 }
f4fc7782 2824 {
b5477537 2825 STRLEN len, i;
d3a7d8c7 2826 int accumulate = 0 ;
f4fc7782 2827 int any_fatals = 0 ;
b83604b4 2828 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2829 for (i = 0 ; i < len ; ++i) {
2830 accumulate |= ptr[i] ;
2831 any_fatals |= (ptr[i] & 0xAA) ;
2832 }
4243c432
NC
2833 if (!accumulate) {
2834 if (!specialWARN(PL_compiling.cop_warnings))
2835 PerlMemShared_free(PL_compiling.cop_warnings);
2836 PL_compiling.cop_warnings = pWARN_NONE;
2837 }
3c3f8cd6
AB
2838 /* Yuck. I can't see how to abstract this: */
2839 else if (isWARN_on(
2840 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2841 WARN_ALL)
2842 && !any_fatals)
2843 {
2844 if (!specialWARN(PL_compiling.cop_warnings))
2845 PerlMemShared_free(PL_compiling.cop_warnings);
2846 PL_compiling.cop_warnings = pWARN_ALL;
2847 PL_dowarn |= G_WARN_ONCE ;
2848 }
d3a7d8c7 2849 else {
72dc9ed5
NC
2850 STRLEN len;
2851 const char *const p = SvPV_const(sv, len);
2852
2853 PL_compiling.cop_warnings
8ee4cf24 2854 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2855 p, len);
2856
d3a7d8c7
GS
2857 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2858 PL_dowarn |= G_WARN_ONCE ;
2859 }
f4fc7782 2860
d3a7d8c7 2861 }
4438c4b7 2862 }
971a9dd3 2863 }
8ca2a5d6
DD
2864#ifdef WIN32
2865 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2866 w32_sloppystat = (bool)sv_true(sv);
2867 }
2868#endif
79072805
LW
2869 break;
2870 case '.':
3280af22
NIS
2871 if (PL_localizing) {
2872 if (PL_localizing == 1)
7766f137 2873 SAVESPTR(PL_last_in_gv);
748a9306 2874 }
3280af22 2875 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2876 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2877 break;
2878 case '^':
acbe1b9d 2879 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2880 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2881 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2882 break;
2883 case '~':
acbe1b9d 2884 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2885 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2886 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2887 break;
2888 case '=':
acbe1b9d 2889 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2890 break;
2891 case '-':
acbe1b9d
FC
2892 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2893 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2894 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2895 break;
2896 case '%':
acbe1b9d 2897 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2898 break;
2899 case '|':
4b65379b 2900 {
099be4f1 2901 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2902 if(!io)
2903 break;
38ab35f8 2904 if ((SvIV(sv)) == 0)
4b65379b
CS
2905 IoFLAGS(io) &= ~IOf_FLUSH;
2906 else {
2907 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2908 PerlIO *ofp = IoOFP(io);
2909 if (ofp)
2910 (void)PerlIO_flush(ofp);
2911 IoFLAGS(io) |= IOf_FLUSH;
2912 }
2913 }
79072805
LW
2914 }
2915 break;
79072805 2916 case '/':
1ab48e3a
YO
2917 {
2918 SV *tmpsv= sv;
2919 if (SvROK(sv)) {
2920 SV *referent= SvRV(sv);
2921 const char *reftype= sv_reftype(referent, 0);
d239bea0
A
2922 /* XXX: dodgy type check: This leaves me feeling dirty, but
2923 * the alternative is to copy pretty much the entire
2924 * sv_reftype() into this routine, or to do a full string
2925 * comparison on the return of sv_reftype() both of which
2926 * make me feel worse! NOTE, do not modify this comment
2927 * without reviewing the corresponding comment in
2928 * sv_reftype(). - Yves */
1ab48e3a
YO
2929 if (reftype[0] == 'S' || reftype[0] == 'L') {
2930 IV val= SvIV(referent);
2931 if (val <= 0) {
2932 tmpsv= &PL_sv_undef;
ddc3d23f 2933 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
d8940893 2934 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef. This will be fatal in Perl 5.28",
1ab48e3a
YO
2935 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2936 );
2937 }
2938 } else {
ddce084a 2939 sv_setsv(sv, PL_rs);
ee0ba734 2940 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
2941 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2942 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
2943 }
2944 }
b3a2acfa 2945 SvREFCNT_dec(PL_rs);
1ab48e3a 2946 PL_rs = newSVsv(tmpsv);
b3a2acfa 2947 }
79072805
LW
2948 break;
2949 case '\\':
ef8d46e8 2950 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2951 if (SvOK(sv)) {
7889fe52 2952 PL_ors_sv = newSVsv(sv);
009c130f 2953 }
e3c19b7b 2954 else {
a0714e2c 2955 PL_ors_sv = NULL;
e3c19b7b 2956 }
79072805 2957 break;
7d69d4a6
FC
2958 case '[':
2959 if (SvIV(sv) != 0)
2960 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2961 break;
79072805 2962 case '?':
ff0cee69 2963#ifdef COMPLEX_STATUS
6b88bc9c 2964 if (PL_localizing == 2) {
41cb7b2b 2965 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2966 PL_statusvalue = LvTARGOFF(sv);
2967 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2968 }
2969 else
2970#endif
2971#ifdef VMSISH_STATUS
2972 if (VMSISH_STATUS)
fb38d079 2973 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2974 else
2975#endif
38ab35f8 2976 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2977 break;
2978 case '!':
93189314
JH
2979 {
2980#ifdef VMS
2981# define PERL_VMS_BANG vaxc$errno
2982#else
2983# define PERL_VMS_BANG 0
2984#endif
27329181 2985#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2986 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2987 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2988#else
91487cfc 2989 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2990 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2991#endif
93189314 2992 }
79072805
LW
2993 break;
2994 case '<':
985213f2 2995 {
b469f1e0 2996 /* XXX $< currently silently ignores failures */
dfff4baf 2997 const Uid_t new_uid = SvUID(sv);
985213f2 2998 PL_delaymagic_uid = new_uid;
3280af22
NIS
2999 if (PL_delaymagic) {
3000 PL_delaymagic |= DM_RUID;
79072805
LW
3001 break; /* don't do magic till later */
3002 }
3003#ifdef HAS_SETRUID
b469f1e0 3004 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW
3005#else
3006#ifdef HAS_SETREUID
b469f1e0 3007 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 3008#else
85e6fe83 3009#ifdef HAS_SETRESUID
b469f1e0 3010 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3011#else
985213f2 3012 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 3013#ifdef PERL_DARWIN
3014 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3015 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3016 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 3017#endif
b469f1e0 3018 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3019 } else {
cea2e8a9 3020 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3021 }
79072805
LW
3022#endif
3023#endif
85e6fe83 3024#endif
79072805 3025 break;
985213f2 3026 }
79072805 3027 case '>':
985213f2 3028 {
b469f1e0 3029 /* XXX $> currently silently ignores failures */
dfff4baf 3030 const Uid_t new_euid = SvUID(sv);
985213f2 3031 PL_delaymagic_euid = new_euid;
3280af22
NIS
3032 if (PL_delaymagic) {
3033 PL_delaymagic |= DM_EUID;
79072805
LW
3034 break; /* don't do magic till later */
3035 }
3036#ifdef HAS_SETEUID
b469f1e0 3037 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW
3038#else
3039#ifdef HAS_SETREUID
b469f1e0 3040 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW
3041#else
3042#ifdef HAS_SETRESUID
b469f1e0 3043 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3044#else
985213f2 3045 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3046 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3047 else {
cea2e8a9 3048 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3049 }
79072805
LW
3050#endif
3051#endif
85e6fe83 3052#endif
79072805 3053 break;
985213f2 3054 }
79072805 3055 case '(':
985213f2 3056 {
b469f1e0 3057 /* XXX $( currently silently ignores failures */
dfff4baf 3058 const Gid_t new_gid = SvGID(sv);
985213f2 3059 PL_delaymagic_gid = new_gid;
3280af22
NIS
3060 if (PL_delaymagic) {
3061 PL_delaymagic |= DM_RGID;
79072805
LW
3062 break; /* don't do magic till later */
3063 }
3064#ifdef HAS_SETRGID
b469f1e0 3065 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW
3066#else
3067#ifdef HAS_SETREGID
b469f1e0 3068 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW
3069#else
3070#ifdef HAS_SETRESGID
b469f1e0 3071 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3072#else
985213f2 3073 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3074 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3075 else {
cea2e8a9 3076 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3077 }
79072805
LW
3078#endif
3079#endif
85e6fe83 3080#endif
79072805 3081 break;
985213f2 3082 }
79072805 3083 case ')':
985213f2 3084 {
0635704a
HS
3085/* (hv) best guess: maybe we'll need configure probes to do a better job,
3086 * but you can override it if you need to.
3087 */
3088#ifndef INVALID_GID
3089#define INVALID_GID ((Gid_t)-1)
3090#endif
b469f1e0 3091 /* XXX $) currently silently ignores failures */
dfff4baf 3092 Gid_t new_egid;
5cd24f17
PP
3093#ifdef HAS_SETGROUPS
3094 {
b83604b4 3095 const char *p = SvPV_const(sv, len);
757f63d8 3096 Groups_t *gary = NULL;
fdadaf77 3097 const char* endptr;
22ff3130 3098 UV uv;
fb4089e0 3099#ifdef _SC_NGROUPS_MAX
3100 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3101
3102 if (maxgrp < 0)
3103 maxgrp = NGROUPS;
3104#else
3105 int maxgrp = NGROUPS;
3106#endif
757f63d8
SP
3107
3108 while (isSPACE(*p))
3109 ++p;
22ff3130
HS
3110 if (grok_atoUV(p, &uv, &endptr))
3111 new_egid = (Gid_t)uv;
3112 else {
0635704a 3113 new_egid = INVALID_GID;
22ff3130
HS
3114 endptr = NULL;
3115 }
fb4089e0 3116 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3117 if (endptr == NULL)
3118 break;
3119 p = endptr;
757f63d8
SP
3120 while (isSPACE(*p))
3121 ++p;
3122 if (!*p)
3123 break;
fdadaf77 3124 if (!gary)
757f63d8
SP
3125 Newx(gary, i + 1, Groups_t);
3126 else
3127 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3128 if (grok_atoUV(p, &uv, &endptr))
3129 gary[i] = (Groups_t)uv;
3130 else {
0635704a 3131 gary[i] = INVALID_GID;
22ff3130
HS
3132 endptr = NULL;
3133 }
757f63d8
SP
3134 }
3135 if (i)
b469f1e0 3136 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3137 Safefree(gary);
5cd24f17
PP
3138 }
3139#else /* HAS_SETGROUPS */
dfff4baf 3140 new_egid = SvGID(sv);
5cd24f17 3141#endif /* HAS_SETGROUPS */
985213f2 3142 PL_delaymagic_egid = new_egid;
3280af22
NIS
3143 if (PL_delaymagic) {
3144 PL_delaymagic |= DM_EGID;
79072805
LW
3145 break; /* don't do magic till later */
3146 }
3147#ifdef HAS_SETEGID
b469f1e0 3148 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW
3149#else
3150#ifdef HAS_SETREGID
b469f1e0 3151 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW
3152#else
3153#ifdef HAS_SETRESGID
b469f1e0 3154 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3155#else
985213f2 3156 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3157 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3158 else {
cea2e8a9 3159 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3160 }
79072805
LW
3161#endif
3162#endif
85e6fe83 3163#endif
79072805 3164 break;
985213f2 3165 }
79072805 3166 case ':':
2d8e6c8d 3167 PL_chopset = SvPV_force(sv,len);
79072805 3168 break;
9cdac2a2
FC
3169 case '$': /* $$ */
3170 /* Store the pid in mg->mg_obj so we can tell when a fork has
3171 occurred. mg->mg_obj points to *$ by default, so clear it. */
3172 if (isGV(mg->mg_obj)) {
3173 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3174 SvREFCNT_dec(mg->mg_obj);
3175 mg->mg_flags |= MGf_REFCOUNTED;
3176 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3177 }
3178 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3179 break;
79072805 3180 case '0':
e2975953 3181 LOCK_DOLLARZERO_MUTEX;
f1540bed 3182 S_set_dollarzero(aTHX_ sv);
e2975953 3183 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3184 break;
3185 }
3186 return 0;
3187}
3188
3189I32
84c7b88c
BF
3190Perl_whichsig_sv(pTHX_ SV *sigsv)
3191{
3192 const char *sigpv;
3193 STRLEN siglen;
3194 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3195 sigpv = SvPV_const(sigsv, siglen);
3196 return whichsig_pvn(sigpv, siglen);
3197}
3198
3199I32
3200Perl_whichsig_pv(pTHX_ const char *sig)
3201{
3202 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3203 return whichsig_pvn(sig, strlen(sig));
3204}
3205
3206I32
3207Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3208{
eb578fdb 3209 char* const* sigv;
7918f24d 3210
84c7b88c 3211 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3212 PERL_UNUSED_CONTEXT;
79072805 3213
aadb217d 3214 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3215 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3216 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3217#ifdef SIGCLD
84c7b88c 3218 if (memEQs(sig, len, "CHLD"))
79072805
LW
3219 return SIGCLD;
3220#endif
3221#ifdef SIGCHLD
84c7b88c 3222 if (memEQs(sig, len, "CLD"))
79072805
LW
3223 return SIGCHLD;
3224#endif
7f1236c0 3225 return -1;
79072805
LW
3226}
3227
ecfc5424 3228Signal_t
1e82f5a6 3229#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3230Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3231#else
3232Perl_sighandler(int sig)
3233#endif
79072805 3234{
1018e26f
NIS
3235#ifdef PERL_GET_SIG_CONTEXT
3236 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3237#else
cea2e8a9 3238 dTHX;
71d280e3 3239#endif
79072805 3240 dSP;
a0714e2c
SS
3241 GV *gv = NULL;
3242 SV *sv = NULL;
8772537c 3243 SV * const tSv = PL_Sv;
601f1833 3244 CV *cv = NULL;
533c011a 3245 OP *myop = PL_op;
84902520 3246 U32 flags = 0;
8772537c 3247 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3248 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3249 SV *errsv_save = NULL;
71d280e3 3250
84902520 3251
727405f8 3252 if (!PL_psig_ptr[sig]) {
99ef548b 3253 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3254 PL_sig_name[sig]);
3255 exit(sig);
3256 }
ff0cee69 3257
a0d63a7b
DM
3258 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3259 /* Max number of items pushed there is 3*n or 4. We cannot fix
3260 infinity, so we fix 4 (in fact 5): */
3261 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3262 flags |= 1;
3263 PL_savestack_ix += 5; /* Protect save in progress. */
3264 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3265 }
84902520 3266 }
84902520 3267 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3268 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3269 || SvTYPE(cv) != SVt_PVCV) {
3270 HV *st;
f2c0649b 3271 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3272 }
84902520 3273
a0d0e21e 3274 if (!cv || !CvROOT(cv)) {
07c325bb 3275 const HEK * const hek = gv
1d6bb9ae
FC
3276 ? GvENAME_HEK(gv)
3277 : cv && CvNAMED(cv)
3278 ? CvNAME_HEK(cv)
07c325bb
FC
3279 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3280 if (hek)
3281 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3282 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3283 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3284 /* diag_listed_as: SIG%s handler "%s" not defined */
3285 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3286 "SIG%s handler \"__ANON__\" not defined.\n",
3287 PL_sig_name[sig]);
00d579c5 3288 goto cleanup;
79072805
LW
3289 }
3290
0c4d3b5e
DM
3291 sv = PL_psig_name[sig]
3292 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3293 : newSVpv(PL_sig_name[sig],0);
72048cfe 3294 flags |= 8;
0c4d3b5e
DM
3295 SAVEFREESV(sv);
3296
a0d63a7b
DM
3297 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3298 /* make sure our assumption about the size of the SAVEs are correct:
3299 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3300 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3301 }
e336de0d 3302
e788e7d3 3303 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3304 PUSHMARK(SP);
79072805 3305 PUSHs(sv);
8aad04aa
JH
3306#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3307 {
3308 struct sigaction oact;
3309
3310 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3311 if (sip) {
3312 HV *sih = newHV();
ad64d0ec 3313 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3314 /* The siginfo fields signo, code, errno, pid, uid,
3315 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3316 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3317 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3318#ifdef HAS_SIGINFO_SI_ERRNO
3319 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3320#endif
3321#ifdef HAS_SIGINFO_SI_STATUS
3322 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3323#endif
3324#ifdef HAS_SIGINFO_SI_UID
3325 {
3326 SV *uid = newSV(0);
3327 sv_setuid(uid, sip->si_uid);
3328 (void)hv_stores(sih, "uid", uid);
3329 }
3330#endif
3331#ifdef HAS_SIGINFO_SI_PID
3332 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3333#endif
3334#ifdef HAS_SIGINFO_SI_ADDR
3335 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3336#endif
3337#ifdef HAS_SIGINFO_SI_BAND
3338 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3339#endif
8aad04aa 3340 EXTEND(SP, 2);
ad64d0ec 3341 PUSHs(rv);
22f1178f 3342 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3343 }
b4552a27 3344
8aad04aa
JH
3345 }
3346 }
3347#endif
79072805 3348 PUTBACK;
a0d0e21e 3349
100c03aa
JL
3350 errsv_save = newSVsv(ERRSV);
3351
ad64d0ec 3352 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3353
d3acc0f7 3354 POPSTACK;
eed484f9
DD
3355 {
3356 SV * const errsv = ERRSV;
3357 if (SvTRUE_NN(errsv)) {
3358 SvREFCNT_dec(errsv_save);
c22d665b 3359#ifndef PERL_MICRO
1b266415
NIS
3360 /* Handler "died", for example to get out of a restart-able read().
3361 * Before we re-do that on its behalf re-enable the signal which was
3362 * blocked by the system when we entered.
3363 */
c22d665b 3364#ifdef HAS_SIGPROCMASK
d488af49 3365#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3366 if (sip || uap)
c22d665b 3367#endif
eed484f9
DD
3368 {
3369 sigset_t set;
3370 sigemptyset(&set);
3371 sigaddset(&set,sig);
3372 sigprocmask(SIG_UNBLOCK, &set, NULL);
3373 }
c22d665b 3374#else
eed484f9
DD
3375 /* Not clear if this will work */
3376 (void)rsignal(sig, SIG_IGN);
3377 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3378#endif
3379#endif /* !PERL_MICRO */
eed484f9
DD
3380 die_sv(errsv);
3381 }
3382 else {
3383 sv_setsv(errsv, errsv_save);
3384 SvREFCNT_dec(errsv_save);
3385 }
100c03aa
JL
3386 }
3387
7b52d656 3388 cleanup:
0c4d3b5e
DM
3389 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3390 PL_savestack_ix = old_ss_ix;
72048cfe 3391 if (flags & 8)
2357bae7 3392 SvREFCNT_dec_NN(sv);
533c011a 3393 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3394
3280af22
NIS
3395 PL_Sv = tSv; /* Restore global temporaries. */
3396 PL_Xpv = tXpv;
53bb94e2 3397 return;
79072805 3398}
4e35701f
NIS
3399
3400
51371543 3401static void
8772537c 3402S_restore_magic(pTHX_ const void *p)
51371543 3403{
8772537c
AL
3404 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3405 SV* const sv = mgs->mgs_sv;
150b625d 3406 bool bumped;
51371543
GS
3407
3408 if (!sv)
3409 return;
3410
4bac9ae4
CS
3411 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3412 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC
3413 if (mgs->mgs_flags)
3414 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS
3415 else
3416 mg_magical(sv);
51371543
GS
3417 }
3418
150b625d 3419 bumped = mgs->mgs_bumped;
51371543
GS
3420 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3421
3422 /* If we're still on top of the stack, pop us off. (That condition
3423 * will be satisfied if restore_magic was called explicitly, but *not*
3424 * if it's being called via leave_scope.)
3425 * The reason for doing this is that otherwise, things like sv_2cv()
3426 * may leave alloc gunk on the savestack, and some code
3427 * (e.g. sighandler) doesn't expect that...
3428 */
3429 if (PL_savestack_ix == mgs->mgs_ss_ix)
3430 {
1be36ce0
NC
3431 UV popval = SSPOPUV;
3432 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3433 PL_savestack_ix -= 2;
1be36ce0
NC
3434 popval = SSPOPUV;
3435 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3436 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3437 }
150b625d
DM
3438 if (bumped) {
3439 if (SvREFCNT(sv) == 1) {
3440 /* We hold the last reference to this SV, which implies that the
3441 SV was deleted as a side effect of the routines we called.
3442 So artificially keep it alive a bit longer.
3443 We avoid turning on the TEMP flag, which can cause the SV's
3444 buffer to get stolen (and maybe other stuff). */
150b625d 3445 sv_2mortal(sv);
4bac9ae4 3446 SvTEMP_off(sv);
8985fe98 3447 }
150b625d 3448 else
2357bae7 3449 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3450 }
51371543
GS
3451}
3452
0c4d3b5e
DM
3453/* clean up the mess created by Perl_sighandler().
3454 * Note that this is only called during an exit in a signal handler;
3455 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3456 * skipped over. */
0c4d3b5e 3457
51371543 3458static void
8772537c 3459S_unwind_handler_stack(pTHX_ const void *p)
51371543