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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;
ff76feab 174 MAGIC *newmg, *head, *cur, *mg;
6683b158 175
7918f24d
NC
176 PERL_ARGS_ASSERT_MG_GET;
177
407287f9
FC
178 if (PL_localizing == 1 && sv == DEFSV) return 0;
179
ff76feab
AMS
180 /* We must call svt_get(sv, mg) for each valid entry in the linked
181 list of magic. svt_get() may delete the current entry, add new
182 magic to the head of the list, or upgrade the SV. AMS 20010810 */
183
184 newmg = cur = head = mg = SvMAGIC(sv);
185 while (mg) {
35a4481c 186 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 187 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 188
2b260de0 189 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
190
191 /* taint's mg get is so dumb it doesn't need flag saving */
192 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
194 saved = TRUE;
195 }
196
16c91539 197 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 198
58f82c5c
DM
199 /* guard against magic having been deleted - eg FETCH calling
200 * untie */
f9c6fee5 201 if (!SvMAGIC(sv)) {
a623f893
FC
202 /* recalculate flags */
203 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 204 break;
f9c6fee5 205 }
b77f7d40 206
f9c6fee5 207 /* recalculate flags if this entry was deleted. */
ff76feab 208 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
209 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
210 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 211 }
7d1328bb
FC
212 else if (vtbl == &PL_vtbl_utf8) {
213 /* get-magic can reallocate the PV */
214 magic_setutf8(sv, mg);
215 }
ff76feab 216
f9c6fee5 217 mg = nextmg;
ff76feab 218
0723351e 219 if (have_new) {
ff76feab
AMS
220 /* Have we finished with the new entries we saw? Start again
221 where we left off (unless there are more new entries). */
222 if (mg == head) {
0723351e 223 have_new = 0;
ff76feab
AMS
224 mg = cur;
225 head = newmg;
226 }
227 }
228
229 /* Were any new entries added? */
0723351e
NC
230 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
231 have_new = 1;
ff76feab
AMS
232 cur = mg;
233 mg = newmg;
a623f893
FC
234 /* recalculate flags */
235 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 236 }
79072805 237 }
463ee0b2 238
a9844598
CS
239 if (saved)
240 restore_magic(INT2PTR(void *, (IV)mgs_ix));
241
79072805
LW
242 return 0;
243}
244
954c1994
GS
245/*
246=for apidoc mg_set
247
fbe13c60 248Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
249
250=cut
251*/
252
79072805 253int
864dbfa3 254Perl_mg_set(pTHX_ SV *sv)
79072805 255{
35a4481c 256 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 257 MAGIC* mg;
463ee0b2
LW
258 MAGIC* nextmg;
259
7918f24d
NC
260 PERL_ARGS_ASSERT_MG_SET;
261
b5ed8c44
FC
262 if (PL_localizing == 2 && sv == DEFSV) return 0;
263
ff44333e 264 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
265
266 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 267 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 268 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
269 if (mg->mg_flags & MGf_GSKIP) {
270 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 271 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 272 }
e0a73de4 273 if (PL_localizing == 2
b5ed8c44 274 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 275 continue;
2b260de0 276 if (vtbl && vtbl->svt_set)
16c91539 277 vtbl->svt_set(aTHX_ sv, mg);
79072805 278 }
463ee0b2 279
8772537c 280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
281 return 0;
282}
283
954c1994
GS
284/*
285=for apidoc mg_length
286
d4e99c76 287Reports on the SV's length in bytes, calling length magic if available,
796b6530 288but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 289magic if there is no 'length' magic, but with no indication as to
796b6530
KW
290whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
291higher. Use C<sv_len()> instead.
954c1994
GS
292
293=cut
294*/
295
79072805 296U32
864dbfa3 297Perl_mg_length(pTHX_ SV *sv)
79072805
LW
298{
299 MAGIC* mg;
463ee0b2 300 STRLEN len;
463ee0b2 301
7918f24d
NC
302 PERL_ARGS_ASSERT_MG_LENGTH;
303
79072805 304 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 305 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 306 if (vtbl && vtbl->svt_len) {
35a4481c 307 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 308 save_magic(mgs_ix, sv);
a0d0e21e 309 /* omit MGf_GSKIP -- not changed here */
16c91539 310 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 311 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
312 return len;
313 }
314 }
315
bd8446cf 316 (void)SvPV_const(sv, len);
463ee0b2 317 return len;
79072805
LW
318}
319
8fb26106 320I32
864dbfa3 321Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
322{
323 MAGIC* mg;
ac27b0f5 324
7918f24d
NC
325 PERL_ARGS_ASSERT_MG_SIZE;
326
93965878 327 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 328 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 329 if (vtbl && vtbl->svt_len) {
35a4481c
AL
330 const I32 mgs_ix = SSNEW(sizeof(MGS));
331 I32 len;
455ece5e 332 save_magic(mgs_ix, sv);
93965878 333 /* omit MGf_GSKIP -- not changed here */
16c91539 334 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 335 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
336 return len;
337 }
338 }
339
340 switch(SvTYPE(sv)) {
341 case SVt_PVAV:
502c6561 342 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
343 case SVt_PVHV:
344 /* FIXME */
345 default:
cea2e8a9 346 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 347
93965878 348 }
a25b5927 349 NOT_REACHED; /* NOTREACHED */
93965878
NIS
350}
351
954c1994
GS
352/*
353=for apidoc mg_clear
354
fbe13c60 355Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
356
357=cut
358*/
359
79072805 360int
864dbfa3 361Perl_mg_clear(pTHX_ SV *sv)
79072805 362{
35a4481c 363 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 364 MAGIC* mg;
8ac77ac9 365 MAGIC *nextmg;
463ee0b2 366
7918f24d
NC
367 PERL_ARGS_ASSERT_MG_CLEAR;
368
455ece5e 369 save_magic(mgs_ix, sv);
463ee0b2 370
8ac77ac9 371 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 372 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 373 /* omit GSKIP -- never set here */
727405f8 374
8ac77ac9
NC
375 nextmg = mg->mg_moremagic; /* it may delete itself */
376
2b260de0 377 if (vtbl && vtbl->svt_clear)
16c91539 378 vtbl->svt_clear(aTHX_ sv, mg);
79072805 379 }
463ee0b2 380
8772537c 381 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
382 return 0;
383}
384
ed624ca8 385static MAGIC*
ddeaf645 386S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 387{
39de7f53
FR
388 assert(flags <= 1);
389
390 if (sv) {
391 MAGIC *mg;
392
393 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
394 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
395 return mg;
396 }
397 }
398 }
399
400 return NULL;
401}
402
954c1994
GS
403/*
404=for apidoc mg_find
405
796b6530 406Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
407
408=cut
409*/
410
93a17b20 411MAGIC*
ddeaf645 412Perl_mg_find(const SV *sv, int type)
93a17b20 413{
ddeaf645 414 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
415}
416
417/*
418=for apidoc mg_findext
419
420Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 421C<L</sv_magicext>>.
39de7f53
FR
422
423=cut
424*/
425
426MAGIC*
ddeaf645 427Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 428{
ddeaf645 429 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
430}
431
96c2a8ff
FC
432MAGIC *
433Perl_mg_find_mglob(pTHX_ SV *sv)
434{
435 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
436 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
437 /* This sv is only a delegate. //g magic must be attached to
438 its target. */
439 vivify_defelem(sv);
440 sv = LvTARG(sv);
441 }
442 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 443 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
444 return NULL;
445}
446
954c1994
GS
447/*
448=for apidoc mg_copy
449
fbe13c60 450Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
451
452=cut
453*/
454
79072805 455int
864dbfa3 456Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 457{
463ee0b2 458 int count = 0;
79072805 459 MAGIC* mg;
7918f24d
NC
460
461 PERL_ARGS_ASSERT_MG_COPY;
462
463ee0b2 463 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 464 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 465 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 466 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 467 }
823a54a3
AL
468 else {
469 const char type = mg->mg_type;
1e73acc8 470 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
471 sv_magic(nsv,
472 (type == PERL_MAGIC_tied)
473 ? SvTIED_obj(sv, mg)
27deb0cf 474 : mg->mg_obj,
823a54a3
AL
475 toLOWER(type), key, klen);
476 count++;
477 }
79072805 478 }
79072805 479 }
463ee0b2 480 return count;
79072805
LW
481}
482
954c1994 483/*
0cbee0a4
DM
484=for apidoc mg_localize
485
9711599e 486Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW
487SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
488gets copied, value magic doesn't (I<e.g.>,
796b6530 489C<taint>, C<pos>).
9711599e 490
796b6530 491If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 492This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 493and that will handle the magic.
0cbee0a4
DM
494
495=cut
496*/
497
498void
af7df257 499Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
500{
501 MAGIC *mg;
7918f24d
NC
502
503 PERL_ARGS_ASSERT_MG_LOCALIZE;
504
658a9f31
JD
505 if (nsv == DEFSV)
506 return;
507
0cbee0a4 508 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 509 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 510 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 511 continue;
0cbee0a4 512
a5063e7c 513 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 514 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 515 else
0cbee0a4
DM
516 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
517 mg->mg_ptr, mg->mg_len);
a5063e7c 518
0cbee0a4 519 /* container types should remain read-only across localization */
9ff3e6d8 520 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
521 }
522
523 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
524 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 525 if (setmagic) {
9711599e
CS
526 PL_localizing = 1;
527 SvSETMAGIC(nsv);
528 PL_localizing = 0;
529 }
0cbee0a4
DM
530 }
531}
532
d9088386
Z
533#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
534static void
535S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
536{
537 const MGVTBL* const vtbl = mg->mg_virtual;
538 if (vtbl && vtbl->svt_free)
539 vtbl->svt_free(aTHX_ sv, mg);
540 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
541 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
542 Safefree(mg->mg_ptr);
543 else if (mg->mg_len == HEf_SVKEY)
544 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
545 }
546 if (mg->mg_flags & MGf_REFCOUNTED)
547 SvREFCNT_dec(mg->mg_obj);
548 Safefree(mg);
549}
550
0cbee0a4 551/*
954c1994
GS
552=for apidoc mg_free
553
fbe13c60 554Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
555
556=cut
557*/
558
79072805 559int
864dbfa3 560Perl_mg_free(pTHX_ SV *sv)
79072805
LW
561{
562 MAGIC* mg;
563 MAGIC* moremagic;
7918f24d
NC
564
565 PERL_ARGS_ASSERT_MG_FREE;
566
79072805 567 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 568 moremagic = mg->mg_moremagic;
d9088386 569 mg_free_struct(sv, mg);
c826f41b 570 SvMAGIC_set(sv, moremagic);
79072805 571 }
b162af07 572 SvMAGIC_set(sv, NULL);
68f8932e 573 SvMAGICAL_off(sv);
79072805
LW
574 return 0;
575}
576
d9088386
Z
577/*
578=for apidoc Am|void|mg_free_type|SV *sv|int how
579
2d7f6611 580Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z
581
582=cut
583*/
584
585void
586Perl_mg_free_type(pTHX_ SV *sv, int how)
587{
588 MAGIC *mg, *prevmg, *moremg;
589 PERL_ARGS_ASSERT_MG_FREE_TYPE;
590 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
591 MAGIC *newhead;
592 moremg = mg->mg_moremagic;
593 if (mg->mg_type == how) {
594 /* temporarily move to the head of the magic chain, in case
595 custom free code relies on this historical aspect of mg_free */
596 if (prevmg) {
597 prevmg->mg_moremagic = moremg;
598 mg->mg_moremagic = SvMAGIC(sv);
599 SvMAGIC_set(sv, mg);
600 }
601 newhead = mg->mg_moremagic;
602 mg_free_struct(sv, mg);
603 SvMAGIC_set(sv, newhead);
604 mg = prevmg;
605 }
606 }
607 mg_magical(sv);
608}
609
79072805 610#include <signal.h>
79072805 611
942e002e 612U32
864dbfa3 613Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 614{
8772537c 615 PERL_UNUSED_ARG(sv);
6cef1e77 616
7918f24d
NC
617 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
618
0bd48802 619 if (PL_curpm) {
27deb0cf 620 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 621 if (rx) {
27deb0cf
YO
622 UV uv= (UV)mg->mg_obj;
623 if (uv == '+') { /* @+ */
a678b0e4 624 /* return the number possible */
07bc277f 625 return RX_NPARENS(rx);
27deb0cf 626 } else { /* @- @^CAPTURE @{^CAPTURE} */
07bc277f 627 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
628
629 /* return the last filled */
f46c4081 630 while ( paren >= 0
07bc277f
NC
631 && (RX_OFFS(rx)[paren].start == -1
632 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 633 paren--;
27deb0cf
YO
634 if (uv == '-') {
635 /* @- */
636 return (U32)paren;
637 } else {
638 /* @^CAPTURE @{^CAPTURE} */
639 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
640 }
641 }
0bd48802 642 }
8f580fb8 643 }
ac27b0f5 644
942e002e 645 return (U32)-1;
6cef1e77
IZ
646}
647
6502e081
DM
648/* @-, @+ */
649
6cef1e77 650int
864dbfa3 651Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 652{
7918f24d
NC
653 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
654
0bd48802 655 if (PL_curpm) {
27deb0cf 656 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 657 if (rx) {
27deb0cf
YO
658 const UV uv= (UV)mg->mg_obj;
659 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
660 const I32 paren = mg->mg_len
661 + (uv == '\003' ? 1 : 0);
a10eae29
FC
662 SSize_t s;
663 SSize_t t;
0bd48802
AL
664 if (paren < 0)
665 return 0;
07bc277f
NC
666 if (paren <= (I32)RX_NPARENS(rx) &&
667 (s = RX_OFFS(rx)[paren].start) != -1 &&
668 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 669 {
a10eae29 670 SSize_t i;
27deb0cf
YO
671
672 if (uv == '+') /* @+ */
0bd48802 673 i = t;
27deb0cf 674 else if (uv == '-') /* @- */
0bd48802 675 i = s;
27deb0cf
YO
676 else { /* @^CAPTURE @{^CAPTURE} */
677 CALLREG_NUMBUF_FETCH(rx,paren,sv);
678 return 0;
679 }
0bd48802 680
a10eae29 681 if (RX_MATCH_UTF8(rx)) {
07bc277f 682 const char * const b = RX_SUBBEG(rx);
0bd48802 683 if (b)
6502e081
DM
684 i = RX_SUBCOFFSET(rx) +
685 utf8_length((U8*)b,
686 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 687 }
727405f8 688
a10eae29 689 sv_setuv(sv, i);
232af1f8 690 return 0;
1aa99e6b 691 }
0bd48802 692 }
6cef1e77 693 }
232af1f8 694 sv_setsv(sv, NULL);
6cef1e77
IZ
695 return 0;
696}
697
6502e081
DM
698/* @-, @+ */
699
e4b89193 700int
a29d06ed
MG
701Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
702{
7918f24d 703 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 704 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
705 PERL_UNUSED_ARG(sv);
706 PERL_UNUSED_ARG(mg);
cb077ed2 707 Perl_croak_no_modify();
0dbb1585 708 NORETURN_FUNCTION_END;
a29d06ed
MG
709}
710
ad3296c6 711#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
712 if (SvPOK(sv)) { \
713 STRLEN len = SvCUR(sv); \
714 char * const p = SvPVX(sv); \
8e6b4db6
PC
715 while (len > 0 && isSPACE(p[len-1])) \
716 --len; \
717 SvCUR_set(sv, len); \
718 p[len] = '\0'; \
719 } \
ad3296c6
SH
720} STMT_END
721
8b850bd5
NC
722void
723Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
724{
7918f24d
NC
725 PERL_ARGS_ASSERT_EMULATE_COP_IO;
726
8b850bd5 727 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
e03e82a0 728 sv_set_undef(sv);
8b850bd5 729 else {
b2aed775 730 SvPVCLEAR(sv);
8b850bd5
NC
731 SvUTF8_off(sv);
732 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 733 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
734 assert(value);
735 sv_catsv(sv, value);
736 }
737 sv_catpvs(sv, "\0");
738 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 739 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
740 assert(value);
741 sv_catsv(sv, value);
742 }
743 }
744}
745
d9fe7d23
KW
746STATIC void
747S_fixup_errno_string(pTHX_ SV* sv)
748{
749 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
750 * Perl space. */
751
752 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
753
754 assert(SvOK(sv));
b35e4f8b
KW
755
756 if(strEQ(SvPVX(sv), "")) {
757 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
758 }
759 else {
d9fe7d23 760
d3c0b317
KW
761 /* In some locales the error string may come back as UTF-8, in which
762 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
763 * avoid as many possible backward compatibility issues as possible, we
764 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW
765 * an entirely invariant string. We assume that if the string looks
766 * like UTF-8, it really is UTF-8: "text in any other encoding that
767 * uses bytes with the high bit set is extremely unlikely to pass a
768 * UTF-8 validity test"
769 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
770 * potential that we will get it wrong however, especially on short
771 * error message text. (If it turns out to be necessary, we could also
772 * keep track if the current LC_MESSAGES locale is UTF-8) */
d3c0b317 773 if (! IN_BYTES /* respect 'use bytes' */
c5f058df 774 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
d3c0b317
KW
775 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
776 {
777 SvUTF8_on(sv);
778 }
b35e4f8b 779 }
d9fe7d23
KW
780}
781
25bbd826
CB
782#ifdef VMS
783#include <descrip.h>
784#include <starlet.h>
785#endif
786
79072805 787int
864dbfa3 788Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 789{
eb578fdb
KW
790 I32 paren;
791 const char *s = NULL;
792 REGEXP *rx;
823a54a3 793 const char * const remaining = mg->mg_ptr + 1;
e91d8259 794 char nextchar;
79072805 795
7918f24d
NC
796 PERL_ARGS_ASSERT_MAGIC_GET;
797
e91d8259 798 if (!mg->mg_ptr) {
e91d8259 799 paren = mg->mg_len;
e91d8259 800 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 801 do_numbuf_fetch:
e91d8259 802 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 803 }
e03e82a0
DM
804 else
805 goto set_undef;
e91d8259
NC
806 return 0;
807 }
808
809 nextchar = *remaining;
79072805 810 switch (*mg->mg_ptr) {
748a9306 811 case '\001': /* ^A */
f2da823f 812 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
813 else
814 sv_set_undef(sv);
125b9982
NT
815 if (SvTAINTED(PL_bodytarget))
816 SvTAINTED_on(sv);
748a9306 817 break;
e5218da5 818 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 819 if (nextchar == '\0') {
e5218da5
GA
820 sv_setiv(sv, (IV)PL_minus_c);
821 }
823a54a3 822 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
823 sv_setiv(sv, (IV)STATUS_NATIVE);
824 }
49460fe6
NIS
825 break;
826
79072805 827 case '\004': /* ^D */
aea4f609 828 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 829 break;
28f23441 830 case '\005': /* ^E */
6c6eab55
KW
831 if (nextchar != '\0') {
832 if (strEQ(remaining, "NCODING"))
199670db 833 sv_setsv(sv, NULL);
4f4ff3a7 834 break;
6c6eab55 835 }
4f4ff3a7
KW
836
837#if defined(VMS) || defined(OS2) || defined(WIN32)
838# if defined(VMS)
2a99ff86
KW
839 {
840 char msg[255];
841 $DESCRIPTOR(msgdsc,msg);
842 sv_setnv(sv,(NV) vaxc$errno);
843 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
844 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
845 else
b2aed775 846 SvPVCLEAR(sv);
2a99ff86 847 }
4b645107 848#elif defined(OS2)
2a99ff86
KW
849 if (!(_emx_env & 0x200)) { /* Under DOS */
850 sv_setnv(sv, (NV)errno);
2c6ee1a7 851 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
852 } else {
853 if (errno != errno_isOS2) {
854 const int tmp = _syserrno();
855 if (tmp) /* 2nd call to _syserrno() makes it 0 */
856 Perl_rc = tmp;
857 }
858 sv_setnv(sv, (NV)Perl_rc);
859 sv_setpv(sv, os2error(Perl_rc));
860 }
1534c6f5 861 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
862 fixup_errno_string(sv);
863 }
4f4ff3a7 864# elif defined(WIN32)
2a99ff86
KW
865 {
866 const DWORD dwErr = GetLastError();
867 sv_setnv(sv, (NV)dwErr);
868 if (dwErr) {
869 PerlProc_GetOSError(sv, dwErr);
2efab60d 870 fixup_errno_string(sv);
2a99ff86
KW
871 }
872 else
b2aed775 873 SvPVCLEAR(sv);
2a99ff86
KW
874 SetLastError(dwErr);
875 }
4f4ff3a7
KW
876# else
877# error Missing code for platform
878# endif
2a99ff86
KW
879 SvRTRIM(sv);
880 SvNOK_on(sv); /* what a wonderful hack! */
881 break;
4f4ff3a7
KW
882#endif /* End of platforms with special handling for $^E; others just fall
883 through to $! */
46f3e16c
KW
884
885 case '!':
886 {
5f1b979d 887 dSAVE_ERRNO;
46f3e16c 888#ifdef VMS
5f1b979d 889 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 890#else
5f1b979d 891 sv_setnv(sv, (NV)errno);
46f3e16c
KW
892#endif
893#ifdef OS2
5f1b979d
KW
894 if (errno == errno_isOS2 || errno == errno_isOS2_set)
895 sv_setpv(sv, os2error(Perl_rc));
896 else
46f3e16c 897#endif
5f1b979d 898 if (! errno) {
b2aed775 899 SvPVCLEAR(sv);
46f3e16c 900 }
5f1b979d
KW
901 else {
902
903 /* Strerror can return NULL on some platforms, which will
904 * result in 'sv' not being considered SvOK. The SvNOK_on()
905 * below will cause just the number part to be valid */
2c6ee1a7 906 sv_setpv(sv, my_strerror(errno));
5f1b979d
KW
907 if (SvOK(sv)) {
908 fixup_errno_string(sv);
909 }
910 }
911 RESTORE_ERRNO;
46f3e16c
KW
912 }
913
914 SvRTRIM(sv);
915 SvNOK_on(sv); /* what a wonderful hack! */
916 break;
917
79072805 918 case '\006': /* ^F */
3280af22 919 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 920 break;
9ebf26ad
FR
921 case '\007': /* ^GLOBAL_PHASE */
922 if (strEQ(remaining, "LOBAL_PHASE")) {
923 sv_setpvn(sv, PL_phase_names[PL_phase],
924 strlen(PL_phase_names[PL_phase]));
925 }
926 break;
a0d0e21e 927 case '\010': /* ^H */
3280af22 928 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 929 break;
9d116dd7 930 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 931 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 932 break;
8561ea1d
FC
933 case '\014': /* ^LAST_FH */
934 if (strEQ(remaining, "AST_FH")) {
935 if (PL_last_in_gv) {
936 assert(isGV_with_GP(PL_last_in_gv));
937 SV_CHECK_THINKFIRST_COW_DROP(sv);
938 prepare_SV_for_RV(sv);
939 SvOK_off(sv);
940 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
941 SvROK_on(sv);
942 sv_rvweaken(sv);
943 }
944 else sv_setsv_nomg(sv, NULL);
945 }
946 break;
ac27b0f5 947 case '\017': /* ^O & ^OPEN */
823a54a3 948 if (nextchar == '\0') {
ac27b0f5 949 sv_setpv(sv, PL_osname);
3511154c
DM
950 SvTAINTED_off(sv);
951 }
823a54a3 952 else if (strEQ(remaining, "PEN")) {
8b850bd5 953 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 954 }
28f23441 955 break;
9ebf26ad 956 case '\020':
a6d0b1b5 957 sv_setiv(sv, (IV)PL_perldb);
79072805 958 break;
fb73857a 959 case '\023': /* ^S */
a6d0b1b5 960 {
bc177e6b 961 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 962 SvOK_off(sv);
3280af22 963 else if (PL_in_eval)
6dc8a9e4 964 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
965 else
966 sv_setiv(sv, 0);
d58bf5aa 967 }
fb73857a 968 break;
79072805 969 case '\024': /* ^T */
823a54a3 970 if (nextchar == '\0') {
88e89b8a 971#ifdef BIG_TIME
7c36658b 972 sv_setnv(sv, PL_basetime);
88e89b8a 973#else
7c36658b 974 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 975#endif
7c36658b 976 }
823a54a3 977 else if (strEQ(remaining, "AINT"))
284167a5
SM
978 sv_setiv(sv, TAINTING_get
979 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 980 : 0);
7c36658b 981 break;
e07ea26a 982 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 983 if (strEQ(remaining, "NICODE"))
a05d7ebb 984 sv_setuv(sv, (UV) PL_unicode);
823a54a3 985 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 986 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
987 else if (strEQ(remaining, "TF8CACHE"))
988 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
989 break;
990 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 991 if (nextchar == '\0')
4438c4b7 992 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 993 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 994 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 995 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
996 }
997 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 998 goto set_undef;
013b78e8 999 }
d3a7d8c7 1000 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
1001 /* Get the bit mask for $warnings::Bits{all}, because
1002 * it could have been extended by warnings::register */
4bac9ae4
CS
1003 HV * const bits = get_hv("warnings::Bits", 0);
1004 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1005 if (bits_all)
1006 sv_copypv(sv, *bits_all);
1007 else
1008 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1009 }
4438c4b7 1010 else {
72dc9ed5
NC
1011 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1012 *PL_compiling.cop_warnings);
ac27b0f5 1013 }
4438c4b7 1014 }
8ca2a5d6
DD
1015#ifdef WIN32
1016 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1017 sv_setiv(sv, w32_sloppystat);
1018 }
1019#endif
79072805 1020 break;
79072805 1021 case '+':
aaa362c4 1022 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1023 paren = RX_LASTPAREN(rx);
1024 if (paren)
1025 goto do_numbuf_fetch;
79072805 1026 }
e03e82a0 1027 goto set_undef;
a01268b5
JH
1028 case '\016': /* ^N */
1029 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1030 paren = RX_LASTCLOSEPAREN(rx);
1031 if (paren)
1032 goto do_numbuf_fetch;
a01268b5 1033 }
e03e82a0 1034 goto set_undef;
79072805 1035 case '.':
3280af22 1036 if (GvIO(PL_last_in_gv)) {
357c8808 1037 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1038 }
79072805
LW
1039 break;
1040 case '?':
809a5acc 1041 {
809a5acc 1042 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1043#ifdef COMPLEX_STATUS
41cb7b2b 1044 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1045 LvTARGOFF(sv) = PL_statusvalue;
1046 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1047#endif
809a5acc 1048 }
79072805
LW
1049 break;
1050 case '^':
acbe1b9d 1051 if (GvIOp(PL_defoutgv))
099be4f1 1052 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1053 if (s)
1054 sv_setpv(sv,s);
1055 else {
3280af22 1056 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1057 sv_catpvs(sv,"_TOP");
79072805
LW
1058 }
1059 break;
1060 case '~':
acbe1b9d 1061 if (GvIOp(PL_defoutgv))
0daa599b 1062 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1063 if (!s)
3280af22 1064 s = GvENAME(PL_defoutgv);
79072805
LW
1065 sv_setpv(sv,s);
1066 break;
79072805 1067 case '=':
099be4f1 1068 if (GvIO(PL_defoutgv))
0daa599b 1069 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1070 break;
1071 case '-':
099be4f1 1072 if (GvIO(PL_defoutgv))
0daa599b 1073 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1074 break;
1075 case '%':
099be4f1 1076 if (GvIO(PL_defoutgv))
0daa599b 1077 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1078 break;
79072805 1079 case ':':
79072805
LW
1080 case '/':
1081 break;
1082 case '[':
e1dccc0d 1083 sv_setiv(sv, 0);
79072805
LW
1084 break;
1085 case '|':
099be4f1 1086 if (GvIO(PL_defoutgv))
0daa599b 1087 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1088 break;
79072805 1089 case '\\':
b2ce0fda 1090 if (PL_ors_sv)
f28098ff 1091 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1092 else
e03e82a0 1093 goto set_undef;
79072805 1094 break;
0e219455 1095 case '$': /* $$ */
9cdac2a2
FC
1096 {
1097 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1098 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1099 /* never set manually, or at least not since last fork */
1100 sv_setiv(sv, pid);
19db9fb7
Z
1101 /* never unsafe, even if reading in a tainted expression */
1102 SvTAINTED_off(sv);
1103 }
9cdac2a2
FC
1104 /* else a value has been assigned manually, so do nothing */
1105 }
0e219455 1106 break;
79072805 1107 case '<':
dfff4baf 1108 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1109 break;
1110 case '>':
dfff4baf 1111 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1112 break;
1113 case '(':
dfff4baf 1114 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1115 goto add_groups;
1116 case ')':
dfff4baf 1117 sv_setgid(sv, PerlProc_getegid());
79072805 1118 add_groups:
79072805 1119#ifdef HAS_GETGROUPS
79072805 1120 {
57d7c65e 1121 Groups_t *gary = NULL;
375ed12a
JH
1122 I32 i;
1123 I32 num_groups = getgroups(0, gary);
1124 if (num_groups > 0) {
1125 Newx(gary, num_groups, Groups_t);
1126 num_groups = getgroups(num_groups, gary);
1127 for (i = 0; i < num_groups; i++)
147e3846 1128 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1129 Safefree(gary);
1130 }
79072805 1131 }
155aba94 1132 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1133#endif
79072805 1134 break;
79072805
LW
1135 case '0':
1136 break;
1137 }
a0d0e21e 1138 return 0;
e03e82a0
DM
1139
1140 set_undef:
1141 sv_set_undef(sv);
1142 return 0;
79072805
LW
1143}
1144
1145int
864dbfa3 1146Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1147{
8772537c 1148 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1149
7918f24d
NC
1150 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1151
79072805 1152 if (uf && uf->uf_val)
24f81a43 1153 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1154 return 0;
1155}
1156
1157int
864dbfa3 1158Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1159{
9ae3433d 1160 STRLEN len = 0, klen;
12033064 1161 const char * const key = MgPV_const(mg,klen);
888a67f6 1162 const char *s = "";
1e422769 1163
7918f24d
NC
1164 PERL_ARGS_ASSERT_MAGIC_SETENV;
1165
613c63b4 1166 SvGETMAGIC(sv);
12033064 1167 if (SvOK(sv)) {
613c63b4
CS
1168 /* defined environment variables are byte strings; unfortunately
1169 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1170 (void)SvPV_force_nomg_nolen(sv);
1171 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1172 if (SvUTF8(sv)) {
1173 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1174 SvUTF8_off(sv);
1175 }
1176 s = SvPVX(sv);
1177 len = SvCUR(sv);
12033064
CS
1178 }
1179 my_setenv(key, s); /* does the deed */
1180
a0d0e21e
LW
1181#ifdef DYNAMIC_ENV_FETCH
1182 /* We just undefd an environment var. Is a replacement */
1183 /* waiting in the wings? */
1184 if (!len) {
6bd66ee9 1185 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1186 if (valp)
4ab59fcc 1187 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1188 }
1189#endif
1e422769 1190
28542d8f 1191#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1192 /* And you'll never guess what the dog had */
1193 /* in its mouth... */
284167a5 1194 if (TAINTING_get) {
1e422769
PP
1195 MgTAINTEDDIR_off(mg);
1196#ifdef VMS
b2aed775 1197 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1198 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1199 int i = 0, j = 0;
1200
6fca0082 1201 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1202 elt = eltbuf;
1e422769
PP
1203 do { /* DCL$PATH may be a search list */
1204 while (1) { /* as may dev portion of any element */
1205 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1206 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1207 cando_by_name(S_IWUSR,0,elt) ) {
1208 MgTAINTEDDIR_on(mg);
1209 return 0;
1210 }
1211 }
bd61b366 1212 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1213 *cp = '\0';
1214 if (my_trnlnm(elt, eltbuf, j++))
1215 elt = eltbuf;
1216 else
1217 break;
1218 }
1219 j = 0;
1220 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1221 }
1222#endif /* VMS */
b2aed775 1223 if (s && memEQs(key, klen, "PATH")) {
8772537c 1224 const char * const strend = s + len;
463ee0b2 1225
70b484a8
DM
1226 /* set MGf_TAINTEDDIR if any component of the new path is
1227 * relative or world-writeable */
463ee0b2 1228 while (s < strend) {
96827780 1229 char tmpbuf[256];
c623ac67 1230 Stat_t st;
5f74f29c 1231 I32 i;
83269ced
CB
1232#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1233 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1234#else
1235 const char path_sep = ':';
1236#endif
ba0a4150 1237 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1238 s, strend, path_sep, &i);
463ee0b2 1239 s++;
bb7a0f54 1240 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1241#ifdef __VMS
1242 /* no colon thus no device name -- assume relative path */
1243 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1244 /* Using Unix separator, e.g. under bash, so act line Unix */
1245 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1246#else
1247 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1248#endif
c6ed36e1 1249 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1250 MgTAINTEDDIR_on(mg);
1e422769
PP
1251 return 0;
1252 }
463ee0b2 1253 }
79072805
LW
1254 }
1255 }
28542d8f 1256#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1257
79072805
LW
1258 return 0;
1259}
1260
1261int
864dbfa3 1262Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1263{
7918f24d 1264 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1265 PERL_UNUSED_ARG(sv);
bd61b366 1266 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1267 return 0;
1268}
1269
88e89b8a 1270int
864dbfa3 1271Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1272{
7918f24d 1273 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1274 PERL_UNUSED_ARG(mg);
b0269e46 1275#if defined(VMS)
cea2e8a9 1276 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1277#else
3280af22 1278 if (PL_localizing) {
fb73857a 1279 HE* entry;
b0269e46 1280 my_clearenv();
85fbaab2
NC
1281 hv_iterinit(MUTABLE_HV(sv));
1282 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1283 I32 keylen;
1284 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1285 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1286 }
1287 }
1288#endif
1289 return 0;
1290}
1291
1292int
864dbfa3 1293Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1294{
7918f24d 1295 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1296 PERL_UNUSED_ARG(sv);
1297 PERL_UNUSED_ARG(mg);
b0269e46
AB
1298#if defined(VMS)
1299 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1300#else
1301 my_clearenv();
1302#endif
3e3baf6d 1303 return 0;
66b1d557
HM
1304}
1305
64ca3a65 1306#ifndef PERL_MICRO
2d4fcd5e
AJ
1307#ifdef HAS_SIGPROCMASK
1308static void
1309restore_sigmask(pTHX_ SV *save_sv)
1310{
0bd48802 1311 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1312 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1313}
1314#endif
66b1d557 1315int
864dbfa3 1316Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1317{
88e89b8a 1318 /* Are we fetching a signal entry? */
708854f2 1319 int i = (I16)mg->mg_private;
7918f24d
NC
1320
1321 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1322
708854f2 1323 if (!i) {
84c7b88c
BF
1324 STRLEN siglen;
1325 const char * sig = MgPV_const(mg, siglen);
1326 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1327 }
1328
e02bfb16 1329 if (i > 0) {
22c35a8c
GS
1330 if(PL_psig_ptr[i])
1331 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1332 else {
46da273f 1333 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1334#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1335 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1336 sigstate = SIG_IGN;
2e34cc90
CL
1337#endif
1338#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1339 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1340 sigstate = SIG_DFL;
85b332e2 1341#endif
88e89b8a 1342 /* cache state so we don't fetch it again */
8aad04aa 1343 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1344 sv_setpvs(sv,"IGNORE");
88e89b8a 1345 else
e03e82a0 1346 sv_set_undef(sv);
46da273f 1347 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1348 SvTEMP_off(sv);
1349 }
1350 }
1351 return 0;
1352}
1353int
864dbfa3 1354Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1355{
7918f24d 1356 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1357
38a124f0 1358 magic_setsig(NULL, mg);
179c85a2 1359 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1360}
3d37d572 1361
0a8e0eff 1362Signal_t
8aad04aa 1363#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1364Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1365#else
0a8e0eff 1366Perl_csighandler(int sig)
8aad04aa 1367#endif
0a8e0eff 1368{
1018e26f
NIS
1369#ifdef PERL_GET_SIG_CONTEXT
1370 dTHXa(PERL_GET_SIG_CONTEXT);
1371#else
85b332e2
CL
1372 dTHX;
1373#endif
1271a1be 1374#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1375#if defined(__cplusplus) && defined(__GNUC__)
1376 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1377 * parameters would be warned about. */
1378 PERL_UNUSED_ARG(sip);
1379 PERL_UNUSED_ARG(uap);
1380#endif
1271a1be 1381#endif
23ada85b 1382#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1383 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1384 if (PL_sig_ignoring[sig]) return;
85b332e2 1385#endif
2e34cc90 1386#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1387 if (PL_sig_defaulting[sig])
2e34cc90
CL
1388#ifdef KILL_BY_SIGPRC
1389 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1390#else
1391 exit(1);
1392#endif
1393#endif
406878dd 1394 if (
853d2c32
RGS
1395#ifdef SIGILL
1396 sig == SIGILL ||
1397#endif
1398#ifdef SIGBUS
1399 sig == SIGBUS ||
1400#endif
1401#ifdef SIGSEGV
1402 sig == SIGSEGV ||
1403#endif
1404 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1405 /* Call the perl level handler now--
31c91b43 1406 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1407#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1408 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1409#else
1410 (*PL_sighandlerp)(sig);
92807b6d 1411#endif
406878dd 1412 else {
31c91b43 1413 if (!PL_psig_pend) return;
406878dd
GA
1414 /* Set a flag to say this signal is pending, that is awaiting delivery after
1415 * the current Perl opcode completes */
1416 PL_psig_pend[sig]++;
1417
1418#ifndef SIG_PENDING_DIE_COUNT
1419# define SIG_PENDING_DIE_COUNT 120
1420#endif
fe13d51d 1421 /* Add one to say _a_ signal is pending */
406878dd
GA
1422 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1423 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1424 (unsigned long)SIG_PENDING_DIE_COUNT);
1425 }
0a8e0eff
NIS
1426}
1427
2e34cc90
CL
1428#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1429void
1430Perl_csighandler_init(void)
1431{
1432 int sig;
27da23d5 1433 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1434
1435 for (sig = 1; sig < SIG_SIZE; sig++) {
1436#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1437 dTHX;
27da23d5 1438 PL_sig_defaulting[sig] = 1;
5c1546dc 1439 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1440#endif
1441#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1442 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1443#endif
1444 }
27da23d5 1445 PL_sig_handlers_initted = 1;
2e34cc90
CL
1446}
1447#endif
1448
7fe50b8b
LT
1449#if defined HAS_SIGPROCMASK
1450static void
1451unblock_sigmask(pTHX_ void* newset)
1452{
dc3bf405 1453 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1454 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1455}
1456#endif
1457
0a8e0eff
NIS
1458void
1459Perl_despatch_signals(pTHX)
1460{
1461 int sig;
1462 PL_sig_pending = 0;
1463 for (sig = 1; sig < SIG_SIZE; sig++) {
1464 if (PL_psig_pend[sig]) {
d0166017 1465 dSAVE_ERRNO;
7fe50b8b 1466#ifdef HAS_SIGPROCMASK
55534442
LT
1467 /* From sigaction(2) (FreeBSD man page):
1468 * | Signal routines normally execute with the signal that
1469 * | caused their invocation blocked, but other signals may
1470 * | yet occur.
1471 * Emulation of this behavior (from within Perl) is enabled
1472 * using sigprocmask
1473 */
1474 int was_blocked;
1475 sigset_t newset, oldset;
1476
1477 sigemptyset(&newset);
1478 sigaddset(&newset, sig);
1479 sigprocmask(SIG_BLOCK, &newset, &oldset);
1480 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1481 if (!was_blocked) {
1482 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1483 ENTER;
1484 SAVEFREESV(save_sv);
1485 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1486 }
55534442 1487#endif
25da4428 1488 PL_psig_pend[sig] = 0;
6e324d09 1489#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1490 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1491#else
1492 (*PL_sighandlerp)(sig);
92807b6d 1493#endif
7fe50b8b 1494#ifdef HAS_SIGPROCMASK
55534442 1495 if (!was_blocked)
7fe50b8b 1496 LEAVE;
55534442 1497#endif
d0166017 1498 RESTORE_ERRNO;
0a8e0eff
NIS
1499 }
1500 }
1501}
1502
38a124f0 1503/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1504int
864dbfa3 1505Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1506{
27da23d5 1507 dVAR;
79072805 1508 I32 i;
cbbf8932 1509 SV** svp = NULL;
2d4fcd5e
AJ
1510 /* Need to be careful with SvREFCNT_dec(), because that can have side
1511 * effects (due to closures). We must make sure that the new disposition
1512 * is in place before it is called.
1513 */
cbbf8932 1514 SV* to_dec = NULL;
e72dc28c 1515 STRLEN len;
2d4fcd5e
AJ
1516#ifdef HAS_SIGPROCMASK
1517 sigset_t set, save;
1518 SV* save_sv;
1519#endif
eb578fdb 1520 const char *s = MgPV_const(mg,len);
7918f24d
NC
1521
1522 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1523
748a9306 1524 if (*s == '_') {
84c7b88c 1525 if (memEQs(s, len, "__DIE__"))
3280af22 1526 svp = &PL_diehook;
84c7b88c 1527 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1528 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1529 /* Merge the existing behaviours, which are as follows:
1530 magic_setsig, we always set svp to &PL_warnhook
1531 (hence we always change the warnings handler)
1532 For magic_clearsig, we don't change the warnings handler if it's
1533 set to the &PL_warnhook. */
3280af22 1534 svp = &PL_warnhook;
84c7b88c
BF
1535 } else if (sv) {
1536 SV *tmp = sv_newmortal();
1537 Perl_croak(aTHX_ "No such hook: %s",
1538 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1539 }
748a9306 1540 i = 0;
38a124f0 1541 if (svp && *svp) {
9289f461
RGS
1542 if (*svp != PERL_WARNHOOK_FATAL)
1543 to_dec = *svp;
cbbf8932 1544 *svp = NULL;
4633a7c4 1545 }
748a9306
LW
1546 }
1547 else {
708854f2
NC
1548 i = (I16)mg->mg_private;
1549 if (!i) {
84c7b88c 1550 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1551 mg->mg_private = (U16)i;
708854f2 1552 }
86d86cad 1553 if (i <= 0) {
84c7b88c
BF
1554 if (sv) {
1555 SV *tmp = sv_newmortal();
1556 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1557 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1558 }
748a9306
LW
1559 return 0;
1560 }
2d4fcd5e
AJ
1561#ifdef HAS_SIGPROCMASK
1562 /* Avoid having the signal arrive at a bad time, if possible. */
1563 sigemptyset(&set);
1564 sigaddset(&set,i);
1565 sigprocmask(SIG_BLOCK, &set, &save);
1566 ENTER;
9ff8e806 1567 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1568 SAVEFREESV(save_sv);
1569 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1570#endif
1571 PERL_ASYNC_CHECK();
2e34cc90 1572#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1573 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1574#endif
23ada85b 1575#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1576 PL_sig_ignoring[i] = 0;
85b332e2 1577#endif
2e34cc90 1578#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1579 PL_sig_defaulting[i] = 0;
2e34cc90 1580#endif
2d4fcd5e 1581 to_dec = PL_psig_ptr[i];
38a124f0
NC
1582 if (sv) {
1583 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1584 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1585
1586 /* Signals don't change name during the program's execution, so once
1587 they're cached in the appropriate slot of PL_psig_name, they can
1588 stay there.
1589
1590 Ideally we'd find some way of making SVs at (C) compile time, or
1591 at least, doing most of the work. */
1592 if (!PL_psig_name[i]) {
1593 PL_psig_name[i] = newSVpvn(s, len);
1594 SvREADONLY_on(PL_psig_name[i]);
1595 }
38a124f0 1596 } else {
79fd3822 1597 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1598 PL_psig_name[i] = NULL;
1599 PL_psig_ptr[i] = NULL;
1600 }
748a9306 1601 }
38a124f0 1602 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1603 if (i) {
5c1546dc 1604 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1605 }
748a9306 1606 else
b37c2d43 1607 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1608 } else {
9dfa190b
NC
1609 if (sv && SvOK(sv)) {
1610 s = SvPV_force(sv, len);
1611 } else {
1612 sv = NULL;
1613 }
84c7b88c 1614 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1615 if (i) {
23ada85b 1616#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1617 PL_sig_ignoring[i] = 1;
1618 (void)rsignal(i, PL_csighandlerp);
85b332e2 1619#else
9dfa190b 1620 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1621#endif
9dfa190b 1622 }
2d4fcd5e 1623 }
84c7b88c 1624 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1625 if (i) {
2e34cc90 1626#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1627 PL_sig_defaulting[i] = 1;
1628 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1629#else
9dfa190b 1630 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1631#endif
9dfa190b
NC
1632 }
1633 }
1634 else {
1635 /*
1636 * We should warn if HINT_STRICT_REFS, but without
1637 * access to a known hint bit in a known OP, we can't
1638 * tell whether HINT_STRICT_REFS is in force or not.
1639 */
1640 if (!strchr(s,':') && !strchr(s,'\''))
1641 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1642 SV_GMAGIC);
1643 if (i)
1644 (void)rsignal(i, PL_csighandlerp);
1645 else
1646 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1647 }
748a9306 1648 }
9dfa190b 1649
2d4fcd5e
AJ
1650#ifdef HAS_SIGPROCMASK
1651 if(i)
1652 LEAVE;
1653#endif
ef8d46e8 1654 SvREFCNT_dec(to_dec);
79072805
LW
1655 return 0;
1656}
64ca3a65 1657#endif /* !PERL_MICRO */
79072805
LW
1658
1659int
864dbfa3 1660Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1661{
7918f24d 1662 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1663 PERL_UNUSED_ARG(sv);
e1a479c5 1664
89c14e2e 1665 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1666 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1667 return 0;
1668
0e446081 1669 return magic_clearisa(NULL, mg);
463ee0b2
LW
1670}
1671
0e446081 1672/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1673int
52b45067
RD
1674Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1675{
52b45067 1676 HV* stash;
7918f24d
NC
1677 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1678
52b45067 1679 /* Bail out if destruction is going on */
627364f1 1680 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1681
0e446081
NC
1682 if (sv)
1683 av_clear(MUTABLE_AV(sv));
52b45067 1684
6624142a
FC
1685 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1686 /* This occurs with setisa_elem magic, which calls this
1687 same function. */
1688 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1689
316ebaf2 1690 assert(mg);
6624142a
FC
1691 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1692 SV **svp = AvARRAY((AV *)mg->mg_obj);
1693 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1694 while (items--) {
1695 stash = GvSTASH((GV *)*svp++);
1696 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1697 }
1698
1699 return 0;
1700 }
1701
52b45067 1702 stash = GvSTASH(
6624142a 1703 (const GV *)mg->mg_obj
52b45067
RD
1704 );
1705
00169e2c
FC
1706 /* The stash may have been detached from the symbol table, so check its
1707 name before doing anything. */
1708 if (stash && HvENAME_get(stash))
5562fa71 1709 mro_isa_changed_in(stash);
52b45067
RD
1710
1711 return 0;
1712}
1713
1714int
864dbfa3 1715Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1716{
85fbaab2 1717 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1718 I32 i = 0;
7918f24d
NC
1719
1720 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1721 PERL_UNUSED_ARG(mg);
7719e241 1722
6ff81951 1723 if (hv) {
497b47a8 1724 (void) hv_iterinit(hv);
ad64d0ec 1725 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1726 i = HvUSEDKEYS(hv);
497b47a8
JH
1727 else {
1728 while (hv_iternext(hv))
1729 i++;
1730 }
6ff81951
GS
1731 }
1732
1733 sv_setiv(sv, (IV)i);
1734 return 0;
1735}
1736
1737int
864dbfa3 1738Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1739{
7918f24d 1740 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1741 PERL_UNUSED_ARG(mg);
946ec16e 1742 if (LvTARG(sv)) {
85fbaab2 1743 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1744 }
1745 return 0;
ac27b0f5 1746}
946ec16e 1747
efaf3674
DM
1748/*
1749=for apidoc magic_methcall
1750
1751Invoke a magic method (like FETCH).
1752
2baee27b
FC
1753C<sv> and C<mg> are the tied thingy and the tie magic.
1754
1755C<meth> is the name of the method to call.
1756
1757C<argc> is the number of args (in addition to $self) to pass to the method.
1758
1759The C<flags> can be:
1760
1761 G_DISCARD invoke method with G_DISCARD flag and don't
1762 return a value
1763 G_UNDEF_FILL fill the stack with argc pointers to
1764 PL_sv_undef
1765
1766The arguments themselves are any values following the C<flags> argument.
efaf3674 1767
796b6530 1768Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1769
1770
1771=cut
1772*/
1773
1774SV*
36925d9e 1775Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1776 U32 argc, ...)
a0d0e21e
LW
1777{
1778 dSP;
efaf3674 1779 SV* ret = NULL;
463ee0b2 1780
7918f24d
NC
1781 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1782
efaf3674 1783 ENTER;
d1d7a15d
NC
1784
1785 if (flags & G_WRITING_TO_STDERR) {
1786 SAVETMPS;
1787
2782061f 1788 save_re_context();
d1d7a15d
NC
1789 SAVESPTR(PL_stderrgv);
1790 PL_stderrgv = NULL;
1791 }
1792
efaf3674 1793 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1794 PUSHMARK(SP);
efaf3674 1795
052a7c76
DM
1796 /* EXTEND() expects a signed argc; don't wrap when casting */
1797 assert(argc <= I32_MAX);
1798 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1799 PUSHs(SvTIED_obj(sv, mg));
1800 if (flags & G_UNDEF_FILL) {
1801 while (argc--) {
efaf3674 1802 PUSHs(&PL_sv_undef);
93965878 1803 }
67549bd2 1804 } else if (argc > 0) {
046b0c7d
NC
1805 va_list args;
1806 va_start(args, argc);
1807
1808 do {
1809 SV *const sv = va_arg(args, SV *);
1810 PUSHs(sv);
1811 } while (--argc);
1812
1813 va_end(args);
88e89b8a 1814 }
463ee0b2 1815 PUTBACK;
efaf3674 1816 if (flags & G_DISCARD) {
36925d9e 1817 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1818 }
1819 else {
36925d9e 1820 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1821 ret = *PL_stack_sp--;
1822 }
1823 POPSTACK;
d1d7a15d
NC
1824 if (flags & G_WRITING_TO_STDERR)
1825 FREETMPS;
efaf3674
DM
1826 LEAVE;
1827 return ret;
1828}
1829
efaf3674 1830/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1831
efaf3674 1832STATIC SV*
36925d9e 1833S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1834 int n, SV *val)
1835{
efaf3674
DM
1836 SV* arg1 = NULL;
1837
1838 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1839
1840 if (mg->mg_ptr) {
1841 if (mg->mg_len >= 0) {
db4b3a1d 1842 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1843 }
1844 else if (mg->mg_len == HEf_SVKEY)
1845 arg1 = MUTABLE_SV(mg->mg_ptr);
1846 }
1847 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1848 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1849 sv_2mortal(arg1);
1850 }
1851 if (!arg1) {
046b0c7d 1852 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1853 }
046b0c7d 1854 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1855}
1856
76e3520e 1857STATIC int
36925d9e 1858S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1859{
efaf3674 1860 SV* ret;
463ee0b2 1861
7918f24d
NC
1862 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1863
efaf3674
DM
1864 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1865 if (ret)
1866 sv_setsv(sv, ret);
a0d0e21e
LW
1867 return 0;
1868}
463ee0b2 1869
a0d0e21e 1870int
864dbfa3 1871Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1872{
7918f24d
NC
1873 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1874
fd69380d 1875 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1876 mg->mg_flags |= MGf_GSKIP;
36925d9e 1877 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1878 return 0;
1879}
1880
1881int
864dbfa3 1882Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1883{
b112cff9
DM
1884 MAGIC *tmg;
1885 SV *val;
7918f24d
NC
1886
1887 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1888
b112cff9
DM
1889 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1890 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1891 * public flags indicate its value based on copying from $val. Doing
1892 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1893 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1894 * wrong if $val happened to be tainted, as sv hasn't got magic
1895 * enabled, even though taint magic is in the chain. In which case,
1896 * fake up a temporary tainted value (this is easier than temporarily
1897 * re-enabling magic on sv). */
1898
284167a5 1899 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1900 && (tmg->mg_len & 1))
1901 {
1902 val = sv_mortalcopy(sv);
1903 SvTAINTED_on(val);
1904 }
1905 else
1906 val = sv;
1907
36925d9e 1908 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1909 return 0;
1910}
1911
1912int
864dbfa3 1913Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1914{
7918f24d
NC
1915 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1916
4c13be3f 1917 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1918 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1919}
463ee0b2 1920
93965878
NIS
1921
1922U32
864dbfa3 1923Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1924{
22846ab4 1925 I32 retval = 0;
efaf3674 1926 SV* retsv;
93965878 1927
7918f24d
NC
1928 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1929
36925d9e 1930 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1931 if (retsv) {
1932 retval = SvIV(retsv)-1;
22846ab4
AB
1933 if (retval < -1)
1934 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1935 }
22846ab4 1936 return (U32) retval;
93965878
NIS
1937}
1938
cea2e8a9
GS
1939int
1940Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1941{
7918f24d
NC
1942 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1943
36925d9e 1944 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1945 return 0;
1946}
1947
1948int
864dbfa3 1949Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1950{
efaf3674 1951 SV* ret;
463ee0b2 1952
7918f24d
NC
1953 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1954
36925d9e
RZ
1955 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1956 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1957 if (ret)
1958 sv_setsv(key,ret);
79072805
LW
1959 return 0;
1960}
1961
1962int
1146e912 1963Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1964{
7918f24d
NC
1965 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1966
36925d9e 1967 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1968}
a0d0e21e 1969
a3bcc51e
TP
1970SV *
1971Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1972{
5fcbf73d 1973 SV *retval;
ad64d0ec
NC
1974 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1975 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1976
7918f24d
NC
1977 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1978
a3bcc51e
TP
1979 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1980 SV *key;
bfcb3514 1981 if (HvEITER_get(hv))
a3bcc51e
TP
1982 /* we are in an iteration so the hash cannot be empty */
1983 return &PL_sv_yes;
1984 /* no xhv_eiter so now use FIRSTKEY */
1985 key = sv_newmortal();
ad64d0ec 1986 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1987 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1988 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1989 }
1990
1991 /* there is a SCALAR method that we can call */
36925d9e 1992 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1993 if (!retval)
5fcbf73d 1994 retval = &PL_sv_undef;
a3bcc51e
TP
1995 return retval;
1996}
1997
a0d0e21e 1998int
864dbfa3 1999Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2000{
089b5c60 2001 SV **svp;
7918f24d
NC
2002
2003 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2004
089b5c60
NC
2005 /* The magic ptr/len for the debugger's hash should always be an SV. */
2006 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2007 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2008 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2009 }
2010
2011 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2012 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2013 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2014 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2015
8772537c 2016 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2017 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2018 if (o) {
2019#ifdef PERL_DEBUG_READONLY_OPS
2020 Slab_to_rw(OpSLAB(o));
2021#endif
2022 /* set or clear breakpoint in the relevant control op */
089b5c60 2023 if (SvTRUE(sv))
88df5f01 2024 o->op_flags |= OPf_SPECIAL;
8772537c 2025 else
88df5f01
FC
2026 o->op_flags &= ~OPf_SPECIAL;
2027#ifdef PERL_DEBUG_READONLY_OPS
2028 Slab_to_ro(OpSLAB(o));
2029#endif
8772537c 2030 }
5df8de69 2031 }
79072805
LW
2032 return 0;
2033}
2034
2035int
8772537c 2036Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2037{
502c6561 2038 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2039
2040 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2041
83bf042f 2042 if (obj) {
e1dccc0d 2043 sv_setiv(sv, AvFILL(obj));
83bf042f 2044 } else {
d4a823b3 2045 sv_setsv(sv, NULL);
83bf042f 2046 }
79072805
LW
2047 return 0;
2048}
2049
2050int
864dbfa3 2051Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2052{
502c6561 2053 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2054
2055 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2056
83bf042f 2057 if (obj) {
e1dccc0d 2058 av_fill(obj, SvIV(sv));
83bf042f 2059 } else {
a2a5de95
NC
2060 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2061 "Attempt to set length of freed array");
83bf042f
NC
2062 }
2063 return 0;
2064}
2065
2066int
83f29afa
VP
2067Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2068{
83f29afa
VP
2069 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2070 PERL_UNUSED_ARG(sv);
dc3bf405 2071 PERL_UNUSED_CONTEXT;
83f29afa
VP
2072
2073 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2074#if IVSIZE == I32SIZE
2075 *((IV *) &(mg->mg_len)) = 0;
2076#else
83f29afa
VP
2077 if (mg->mg_ptr)
2078 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2079#endif
83f29afa
VP
2080
2081 return 0;
2082}
2083
2084int
83bf042f
NC
2085Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2086{
7918f24d 2087 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2088 PERL_UNUSED_ARG(sv);
7918f24d 2089
94f3782b
DM
2090 /* during global destruction, mg_obj may already have been freed */
2091 if (PL_in_clean_all)
1ea47f64 2092 return 0;
94f3782b 2093
83bf042f
NC
2094 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2095
2096 if (mg) {
2097 /* arylen scalar holds a pointer back to the array, but doesn't own a
2098 reference. Hence the we (the array) are about to go away with it
2099 still pointing at us. Clear its pointer, else it would be pointing
2100 at free memory. See the comment in sv_magic about reference loops,
2101 and why it can't own a reference to us. */
2102 mg->mg_obj = 0;
2103 }
a0d0e21e
LW
2104 return 0;
2105}
2106
2107int
864dbfa3 2108Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2109{
16eb5365 2110 SV* const lsv = LvTARG(sv);
96c2a8ff 2111 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2112
2113 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2114 PERL_UNUSED_ARG(mg);
ac27b0f5 2115
6174b39a
FC
2116 if (found && found->mg_len != -1) {
2117 STRLEN i = found->mg_len;
25fdce4a 2118 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2119 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2120 sv_setuv(sv, i);
a0d0e21e 2121 return 0;
a0d0e21e 2122 }
35995e5c 2123 sv_setsv(sv,NULL);
a0d0e21e
LW
2124 return 0;
2125}
2126
2127int
864dbfa3 2128Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2129{
16eb5365 2130 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2131 SSize_t pos;
2132 STRLEN len;
c00206c8 2133 STRLEN ulen = 0;
53d44271 2134 MAGIC* found;
aec43834 2135 const char *s;
a0d0e21e 2136
7918f24d 2137 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2138 PERL_UNUSED_ARG(mg);
ac27b0f5 2139
96c2a8ff 2140 found = mg_find_mglob(lsv);
3881461a 2141 if (!found) {
a0d0e21e
LW
2142 if (!SvOK(sv))
2143 return 0;
96c2a8ff 2144 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2145 }
2146 else if (!SvOK(sv)) {
3881461a 2147 found->mg_len = -1;
a0d0e21e
LW
2148 return 0;
2149 }
aec43834 2150 s = SvPV_const(lsv, len);
a0d0e21e 2151
e1dccc0d 2152 pos = SvIV(sv);
a0ed51b3 2153
7e2040f0 2154 if (DO_UTF8(lsv)) {
aec43834 2155 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2156 if (ulen)
2157 len = ulen;
a0ed51b3
LW
2158 }
2159
a0d0e21e
LW
2160 if (pos < 0) {
2161 pos += len;
2162 if (pos < 0)
2163 pos = 0;
2164 }
eb160463 2165 else if (pos > (SSize_t)len)
a0d0e21e 2166 pos = len;
a0ed51b3 2167
3881461a 2168 found->mg_len = pos;
25fdce4a 2169 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2170
79072805
LW
2171 return 0;
2172}
2173
2174int
864dbfa3 2175Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2176{
2177 STRLEN len;
35a4481c 2178 SV * const lsv = LvTARG(sv);
b83604b4 2179 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2180 STRLEN offs = LvTARGOFF(sv);
2181 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2182 const bool negoff = LvFLAGS(sv) & 1;
2183 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2184
2185 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2186 PERL_UNUSED_ARG(mg);
6ff81951 2187
83f78d1a 2188 if (!translate_substr_offsets(
4ddea69a 2189 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2190 negoff ? -(IV)offs : (IV)offs, !negoff,
2191 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2192 )) {
2193 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2194 sv_set_undef(sv);
83f78d1a
FC
2195 return 0;
2196 }
2197
9aa983d2 2198 if (SvUTF8(lsv))
4ddea69a 2199 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2200 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2201 if (SvUTF8(lsv))
2ef4b674 2202 SvUTF8_on(sv);
6ff81951
GS
2203 return 0;
2204}
2205
2206int
864dbfa3 2207Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2208{
83f78d1a 2209 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2210 const char * const tmps = SvPV_const(sv, len);
dd374669 2211 SV * const lsv = LvTARG(sv);
777f7c56
EB
2212 STRLEN lvoff = LvTARGOFF(sv);
2213 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2214 const bool negoff = LvFLAGS(sv) & 1;
2215 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2216
2217 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2218 PERL_UNUSED_ARG(mg);
075a4a2b 2219
a74fb2cd
FC
2220 SvGETMAGIC(lsv);
2221 if (SvROK(lsv))
2222 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2223 "Attempt to use reference as lvalue in substr"
2224 );
fc061ed8
FC
2225 SvPV_force_nomg(lsv,lsv_len);
2226 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2227 if (!translate_substr_offsets(
2228 lsv_len,
2229 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2230 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2231 ))
2232 Perl_croak(aTHX_ "substr outside of string");
2233 oldtarglen = lvlen;
1aa99e6b 2234 if (DO_UTF8(sv)) {
73a087f0 2235 sv_utf8_upgrade_nomg(lsv);
d931b1be 2236 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2237 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2238 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2239 SvUTF8_on(lsv);
2240 }
0d336106 2241 else if (SvUTF8(lsv)) {
5fcbf73d 2242 const char *utf8;
d931b1be 2243 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2244 newtarglen = len;
5fcbf73d 2245 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2246 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2247 Safefree(utf8);
1aa99e6b 2248 }
b76f3ce2 2249 else {
a74fb2cd 2250 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2251 newtarglen = len;
b76f3ce2 2252 }
83f78d1a
FC
2253 if (!neglen) LvTARGLEN(sv) = newtarglen;
2254 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2255
79072805
LW
2256 return 0;
2257}
2258
2259int
864dbfa3 2260Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2261{
7918f24d 2262 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2263 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2264#ifdef NO_TAINT_SUPPORT
2265 PERL_UNUSED_ARG(mg);
2266#endif
7918f24d 2267
64ff300b 2268 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2269 return 0;
2270}
2271
2272int
864dbfa3 2273Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2274{
7918f24d 2275 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2276 PERL_UNUSED_ARG(sv);
7918f24d 2277
b01e650a 2278 /* update taint status */
284167a5 2279 if (TAINT_get)
b01e650a
DM
2280 mg->mg_len |= 1;
2281 else
2282 mg->mg_len &= ~1;
463ee0b2
LW
2283 return 0;
2284}
2285
2286int
864dbfa3 2287Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2288{
35a4481c 2289 SV * const lsv = LvTARG(sv);
7918f24d
NC
2290
2291 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2292 PERL_UNUSED_ARG(mg);
6ff81951 2293
2e9e14dd 2294 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2295
6ff81951
GS
2296 return 0;
2297}
2298
2299int
864dbfa3 2300Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2301{
7918f24d 2302 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2303 PERL_UNUSED_ARG(mg);
79072805
LW
2304 do_vecset(sv); /* XXX slurp this routine */
2305 return 0;
2306}
2307
13733cde
FC
2308SV *
2309Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2310{
a0714e2c 2311 SV *targ = NULL;
13733cde
FC
2312 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2313 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2314 assert(mg);
5f05dabc 2315 if (LvTARGLEN(sv)) {
68dc0745 2316 if (mg->mg_obj) {
8772537c 2317 SV * const ahv = LvTARG(sv);
85fbaab2 2318 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2319 if (he)
2320 targ = HeVAL(he);
68dc0745 2321 }
bbfdc870 2322 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2323 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2324 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2325 {
2326 if (SvRMAGICAL(av)) {
2327 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2328 targ = svp ? *svp : NULL;
2329 }
2330 else
bbfdc870 2331 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2332 }
68dc0745 2333 }
46da273f 2334 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2335 /* somebody else defined it for us */
2336 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2337 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2338 LvTARGLEN(sv) = 0;
2339 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2340 mg->mg_obj = NULL;
68dc0745
PP
2341 mg->mg_flags &= ~MGf_REFCOUNTED;
2342 }
13733cde 2343 return targ;
5f05dabc 2344 }
71be2cbc 2345 else
13733cde
FC
2346 return LvTARG(sv);
2347}
2348
2349int
2350Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2351{
2352 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2353
2354 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2355 return 0;
2356}
2357
2358int
864dbfa3 2359Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2360{
7918f24d 2361 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2362 PERL_UNUSED_ARG(mg);
71be2cbc 2363 if (LvTARGLEN(sv))
68dc0745
PP
2364 vivify_defelem(sv);
2365 if (LvTARG(sv)) {
5f05dabc 2366 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2367 SvSETMAGIC(LvTARG(sv));
2368 }
5f05dabc
PP
2369 return 0;
2370}
2371
71be2cbc 2372void
864dbfa3 2373Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2374{
74e13ce4 2375 MAGIC *mg;
a0714e2c 2376 SV *value = NULL;
71be2cbc 2377
7918f24d
NC
2378 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2379
14befaf4 2380 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2381 return;
68dc0745 2382 if (mg->mg_obj) {
8772537c 2383 SV * const ahv = LvTARG(sv);
85fbaab2 2384 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2385 if (he)
2386 value = HeVAL(he);
3280af22 2387 if (!value || value == &PL_sv_undef)
be2597df 2388 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2389 }
bbfdc870
FC
2390 else if (LvSTARGOFF(sv) < 0)
2391 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2392 else {
502c6561 2393 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2394 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2395 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2396 else {
bbfdc870 2397 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2398 if (!svp || !(value = *svp))
bbfdc870 2399 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2400 }
2401 }
b37c2d43 2402 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2403 SvREFCNT_dec(LvTARG(sv));
2404 LvTARG(sv) = value;
71be2cbc 2405 LvTARGLEN(sv) = 0;
68dc0745 2406 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2407 mg->mg_obj = NULL;
68dc0745 2408 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2409}
2410
2411int
864dbfa3 2412Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2413{
7918f24d 2414 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2415 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2416 return 0;
810b8aa5
GS
2417}
2418
2419int
864dbfa3 2420Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2421{
7918f24d 2422 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2423 PERL_UNUSED_CONTEXT;
0177730e 2424 PERL_UNUSED_ARG(sv);
565764a8 2425 mg->mg_len = -1;
93a17b20
LW
2426 return 0;
2427}
2428
2429int
864dbfa3 2430Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2431{
35a4481c 2432 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2433
7918f24d
NC
2434 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2435
79072805 2436 if (uf && uf->uf_set)
24f81a43 2437 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2438 return 0;
2439}
2440
c277df42 2441int
faf82a0b
AE
2442Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2443{
488344d2 2444 const char type = mg->mg_type;
7918f24d
NC
2445
2446 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2447
a5c7cb08
DM
2448 assert( type == PERL_MAGIC_fm
2449 || type == PERL_MAGIC_qr
2450 || type == PERL_MAGIC_bm);
488344d2 2451 return sv_unmagic(sv, type);
faf82a0b
AE
2452}
2453
7a4c00b4 2454#ifdef USE_LOCALE_COLLATE
79072805 2455int
864dbfa3 2456Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2457{
7918f24d
NC
2458 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2459
bbce6d69 2460 /*
838b5b74 2461 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2462 * and vanished with a faint plop.
2463 */
96a5add6 2464 PERL_UNUSED_CONTEXT;
8772537c 2465 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2466 if (mg->mg_ptr) {
2467 Safefree(mg->mg_ptr);
2468 mg->mg_ptr = NULL;
565764a8 2469 mg->mg_len = -1;
7a4c00b4 2470 }
bbce6d69
PP
2471 return 0;
2472}
7a4c00b4 2473#endif /* USE_LOCALE_COLLATE */
bbce6d69 2474
7e8c5dac
HS
2475/* Just clear the UTF-8 cache data. */
2476int
2477Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2478{
7918f24d 2479 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2480 PERL_UNUSED_CONTEXT;
8772537c 2481 PERL_UNUSED_ARG(sv);
7e8c5dac 2482 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2483 mg->mg_ptr = NULL;
7e8c5dac
HS
2484 mg->mg_len = -1; /* The mg_len holds the len cache. */
2485 return 0;
2486}
2487
bbce6d69 2488int
9cce4f9a
FC
2489Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2490{
9782ce69 2491 const char *bad = NULL;
9cce4f9a 2492 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2493 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2494 switch (mg->mg_private & OPpLVREF_TYPE) {
2495 case OPpLVREF_SV:
2496 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2497 bad = " SCALAR";
2498 break;
2499 case OPpLVREF_AV:
2500 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2501 bad = "n ARRAY";
2502 break;
2503 case OPpLVREF_HV:
2504 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2505 bad = " HASH";
2506 break;
2507 case OPpLVREF_CV:
2508 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2509 bad = " CODE";
2510 }
2511 if (bad)
26a50d99 2512 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2513 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2514 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2515 case 0:
2516 {
2517 SV * const old = PAD_SV(mg->mg_len);
2518 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2519 SvREFCNT_dec(old);
2520 break;
2521 }
2522 case SVt_PVGV:
2523 gv_setref(mg->mg_obj, sv);
2524 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2525 break;
2526 case SVt_PVAV:
2527 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2528 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2529 break;
2530 case SVt_PVHV:
7fcb36d5
JH
2531 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2532 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2533 }
d39c26a6
FC
2534 if (mg->mg_flags & MGf_PERSIST)
2535 NOOP; /* This sv is in use as an iterator var and will be reused,
2536 so we must leave the magic. */
2537 else
2538 /* This sv could be returned by the assignment op, so clear the
2539 magic, as lvrefs are an implementation detail that must not be
2540 leaked to the user. */
2541 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2542 return 0;
2543}
2544
f1540bed
JH
2545static void
2546S_set_dollarzero(pTHX_ SV *sv)
2547 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2548{
2549#ifdef USE_ITHREADS
2550 dVAR;
2551#endif
2552 const char *s;
2553 STRLEN len;
f1540bed
JH
2554#ifdef HAS_SETPROCTITLE
2555 /* The BSDs don't show the argv[] in ps(1) output, they
2556 * show a string from the process struct and provide
2557 * the setproctitle() routine to manipulate that. */
2558 if (PL_origalen != 1) {
2559 s = SvPV_const(sv, len);
38626956 2560# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2561 /* The leading "-" removes the "perl: " prefix,
2562 * but not the "(perl) suffix from the ps(1)
2563 * output, because that's what ps(1) shows if the
2564 * argv[] is modified. */
2565 setproctitle("-%s", s);
2566# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2567 /* This doesn't really work if you assume that
2568 * $0 = 'foobar'; will wipe out 'perl' from the $0
2569 * because in ps(1) output the result will be like
2570 * sprintf("perl: %s (perl)", s)
2571 * I guess this is a security feature:
2572 * one (a user process) cannot get rid of the original name.
2573 * --jhi */
2574 setproctitle("%s", s);
2575# endif
2576 }
2577#elif defined(__hpux) && defined(PSTAT_SETCMD)
2578 if (PL_origalen != 1) {
2579 union pstun un;
2580 s = SvPV_const(sv, len);
2581 un.pst_command = (char *)s;
2582 pstat(PSTAT_SETCMD, un, len, 0, 0);
2583 }
2584#else
2585 if (PL_origalen > 1) {
4f3e04fd 2586 I32 i;
f1540bed
JH
2587 /* PL_origalen is set in perl_parse(). */
2588 s = SvPV_force(sv,len);
2589 if (len >= (STRLEN)PL_origalen-1) {
2590 /* Longer than original, will be truncated. We assume that
2591 * PL_origalen bytes are available. */
2592 Copy(s, PL_origargv[0], PL_origalen-1, char);
2593 }
2594 else {
2595 /* Shorter than original, will be padded. */
2596#ifdef PERL_DARWIN
2597 /* Special case for Mac OS X: see [perl #38868] */
2598 const int pad = 0;
2599#else
2600 /* Is the space counterintuitive? Yes.
2601 * (You were expecting \0?)
2602 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2603 * --jhi */
2604 const int pad = ' ';
2605#endif
2606 Copy(s, PL_origargv[0], len, char);
2607 PL_origargv[0][len] = 0;
2608 memset(PL_origargv[0] + len + 1,
2609 pad, PL_origalen - len - 1);
2610 }
2611 PL_origargv[0][PL_origalen-1] = 0;
2612 for (i = 1; i < PL_origargc; i++)
2613 PL_origargv[i] = 0;
2614#ifdef HAS_PRCTL_SET_NAME
2615 /* Set the legacy process name in addition to the POSIX name on Linux */
2616 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2617 /* diag_listed_as: SKIPME */
2618 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2619 }
2620#endif
2621 }
2622#endif
2623}
2624
9cce4f9a 2625int
864dbfa3 2626Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2627{
20b7effb 2628#ifdef USE_ITHREADS
97aff369 2629 dVAR;
20b7effb 2630#endif
eb578fdb
KW
2631 I32 paren;
2632 const REGEXP * rx;
79072805 2633 I32 i;
8990e307 2634 STRLEN len;
125b9982 2635 MAGIC *tmg;
2fdbfb4d 2636
7918f24d
NC
2637 PERL_ARGS_ASSERT_MAGIC_SET;
2638
e91d8259 2639 if (!mg->mg_ptr) {
960b831f 2640 paren = mg->mg_len;
1e05feb3 2641 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2642 setparen_got_rx:
2fdbfb4d 2643 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2644 } else {
2fdbfb4d
AB
2645 /* Croak with a READONLY error when a numbered match var is
2646 * set without a previous pattern match. Unless it's C<local $1>
2647 */
e91d8259 2648 croakparen:
2fdbfb4d 2649 if (!PL_localizing) {
cb077ed2 2650 Perl_croak_no_modify();
2fdbfb4d
AB
2651 }
2652 }
e91d8259
NC
2653 return 0;
2654 }
2655
2656 switch (*mg->mg_ptr) {
748a9306 2657 case '\001': /* ^A */
f2da823f
FC
2658 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2659 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2660 FmLINES(PL_bodytarget) = 0;
2661 if (SvPOK(PL_bodytarget)) {
2662 char *s = SvPVX(PL_bodytarget);
2663 while ( ((s = strchr(s, '\n'))) ) {
2664 FmLINES(PL_bodytarget)++;
2665 s++;
2666 }
2667 }
125b9982 2668 /* mg_set() has temporarily made sv non-magical */
284167a5 2669 if (TAINTING_get) {
125b9982
NT
2670 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2671 SvTAINTED_on(PL_bodytarget);
2672 else
2673 SvTAINTED_off(PL_bodytarget);
2674 }
748a9306 2675 break;
49460fe6 2676 case '\003': /* ^C */
f2338a2e 2677 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2678 break;
2679
79072805 2680 case '\004': /* ^D */
b4ab917c 2681#ifdef DEBUGGING
a9e2d2bf
DM
2682 {
2683 const char *s = SvPV_nolen_const(sv);
2684 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2685 if (DEBUG_x_TEST || DEBUG_B_TEST)
2686 dump_all_perl(!DEBUG_B_TEST);
2687 }
b4ab917c 2688#else
38ab35f8 2689 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2690#endif
79072805 2691 break;
28f23441 2692 case '\005': /* ^E */
d0063567 2693 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2694#ifdef VMS
38ab35f8 2695 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2696#else
2697# ifdef WIN32
d0063567 2698 SetLastError( SvIV(sv) );
e37778c2
NC
2699# else
2700# ifdef OS2
38ab35f8 2701 os2_setsyserrno(SvIV(sv));
e37778c2 2702# else
d0063567 2703 /* will anyone ever use this? */
38ab35f8 2704 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2705# endif
2706# endif
22fae026 2707#endif
d0063567 2708 }
3e669301 2709 else {
a15a3d9b 2710 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
d5b4785c 2711 if (PL_localizing != 2) {
ac641426
A
2712 deprecate_fatal_in("5.28",
2713 "${^ENCODING} is no longer supported");
d5b4785c 2714 }
3e669301 2715 }
d0063567 2716 break;
79072805 2717 case '\006': /* ^F */
38ab35f8 2718 PL_maxsysfd = SvIV(sv);
79072805 2719 break;
a0d0e21e 2720 case '\010': /* ^H */
38ab35f8 2721 PL_hints = SvIV(sv);
a0d0e21e 2722 break;
9d116dd7 2723 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2724 Safefree(PL_inplace);
bd61b366 2725 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2726 break;
d9bad346
FC
2727 case '\016': /* ^N */
2728 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2729 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2730 goto croakparen;
28f23441 2731 case '\017': /* ^O */
ac27b0f5 2732 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2733 Safefree(PL_osname);
bd61b366 2734 PL_osname = NULL;
3511154c
DM
2735 if (SvOK(sv)) {
2736 TAINT_PROPER("assigning to $^O");
2e0de35c 2737 PL_osname = savesvpv(sv);
3511154c 2738 }
ac27b0f5
NIS
2739 }
2740 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2741 STRLEN len;
2742 const char *const start = SvPV(sv, len);
b54fc2b6 2743 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2744 SV *tmp;
8b850bd5
NC
2745
2746
2747 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2748 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2749
2750 /* Opening for input is more common than opening for output, so
2751 ensure that hints for input are sooner on linked list. */
59cd0e26 2752 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2753 SvUTF8(sv))
2754 : newSVpvs_flags("", SvUTF8(sv));
2755 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2756 mg_set(tmp);
8b850bd5 2757
f747ebd6
Z
2758 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2759 SvUTF8(sv));
2760 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2761 mg_set(tmp);
ac27b0f5 2762 }
28f23441 2763 break;
79072805 2764 case '\020': /* ^P */
2fdbfb4d
AB
2765 PL_perldb = SvIV(sv);
2766 if (PL_perldb && !PL_DBsingle)
2767 init_debugger();
9b9e0be4 2768 break;
79072805 2769 case '\024': /* ^T */
88e89b8a 2770#ifdef BIG_TIME
6b88bc9c 2771 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2772#else
38ab35f8 2773 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2774#endif
79072805 2775 break;
e07ea26a
NC
2776 case '\025': /* ^UTF8CACHE */
2777 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2778 PL_utf8cache = (signed char) sv_2iv(sv);
2779 }
2780 break;
fde18df1 2781 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2782 if (*(mg->mg_ptr+1) == '\0') {
2783 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2784 i = SvIV(sv);
ac27b0f5 2785 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2786 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2787 }
599cee73 2788 }
0a378802 2789 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2790 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2791 if (!SvPOK(sv)) {
2792 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2793 break;
2794 }
f4fc7782 2795 {
b5477537 2796 STRLEN len, i;
d3a7d8c7 2797 int accumulate = 0 ;
f4fc7782 2798 int any_fatals = 0 ;
b83604b4 2799 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2800 for (i = 0 ; i < len ; ++i) {
2801 accumulate |= ptr[i] ;
2802 any_fatals |= (ptr[i] & 0xAA) ;
2803 }
4243c432
NC
2804 if (!accumulate) {
2805 if (!specialWARN(PL_compiling.cop_warnings))
2806 PerlMemShared_free(PL_compiling.cop_warnings);
2807 PL_compiling.cop_warnings = pWARN_NONE;
2808 }
3c3f8cd6
AB
2809 /* Yuck. I can't see how to abstract this: */
2810 else if (isWARN_on(
2811 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2812 WARN_ALL)
2813 && !any_fatals)
2814 {
2815 if (!specialWARN(PL_compiling.cop_warnings))
2816 PerlMemShared_free(PL_compiling.cop_warnings);
2817 PL_compiling.cop_warnings = pWARN_ALL;
2818 PL_dowarn |= G_WARN_ONCE ;
2819 }
d3a7d8c7 2820 else {
72dc9ed5
NC
2821 STRLEN len;
2822 const char *const p = SvPV_const(sv, len);
2823
2824 PL_compiling.cop_warnings
8ee4cf24 2825 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2826 p, len);
2827
d3a7d8c7
GS
2828 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2829 PL_dowarn |= G_WARN_ONCE ;
2830 }
f4fc7782 2831
d3a7d8c7 2832 }
4438c4b7 2833 }
971a9dd3 2834 }
8ca2a5d6
DD
2835#ifdef WIN32
2836 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2837 w32_sloppystat = (bool)sv_true(sv);
2838 }
2839#endif
79072805
LW
2840 break;
2841 case '.':
3280af22
NIS
2842 if (PL_localizing) {
2843 if (PL_localizing == 1)
7766f137 2844 SAVESPTR(PL_last_in_gv);
748a9306 2845 }
3280af22 2846 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2847 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2848 break;
2849 case '^':
acbe1b9d 2850 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2851 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2852 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2853 break;
2854 case '~':
acbe1b9d 2855 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2856 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2857 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2858 break;
2859 case '=':
acbe1b9d 2860 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2861 break;
2862 case '-':
acbe1b9d
FC
2863 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2864 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2865 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2866 break;
2867 case '%':
acbe1b9d 2868 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2869 break;
2870 case '|':
4b65379b 2871 {
099be4f1 2872 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2873 if(!io)
2874 break;
38ab35f8 2875 if ((SvIV(sv)) == 0)
4b65379b
CS
2876 IoFLAGS(io) &= ~IOf_FLUSH;
2877 else {
2878 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2879 PerlIO *ofp = IoOFP(io);
2880 if (ofp)
2881 (void)PerlIO_flush(ofp);
2882 IoFLAGS(io) |= IOf_FLUSH;
2883 }
2884 }
79072805
LW
2885 }
2886 break;
79072805 2887 case '/':
1ab48e3a
YO
2888 {
2889 SV *tmpsv= sv;
2890 if (SvROK(sv)) {
2891 SV *referent= SvRV(sv);
2892 const char *reftype= sv_reftype(referent, 0);
2893 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2894 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2895 * a full string comparison on the return of sv_reftype() both of which
2896 * make me feel worse! NOTE, do not modify this comment without reviewing the
2897 * corresponding comment in sv_reftype(). - Yves */
2898 if (reftype[0] == 'S' || reftype[0] == 'L') {
2899 IV val= SvIV(referent);
2900 if (val <= 0) {
2901 tmpsv= &PL_sv_undef;
ddc3d23f 2902 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
d8940893 2903 "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
2904 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2905 );
2906 }
2907 } else {
ddce084a 2908 sv_setsv(sv, PL_rs);
ee0ba734 2909 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
2910 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2911 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
2912 }
2913 }
b3a2acfa 2914 SvREFCNT_dec(PL_rs);
1ab48e3a 2915 PL_rs = newSVsv(tmpsv);
b3a2acfa 2916 }
79072805
LW
2917 break;
2918 case '\\':
ef8d46e8 2919 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2920 if (SvOK(sv)) {
7889fe52 2921 PL_ors_sv = newSVsv(sv);
009c130f 2922 }
e3c19b7b 2923 else {
a0714e2c 2924 PL_ors_sv = NULL;
e3c19b7b 2925 }
79072805 2926 break;
7d69d4a6
FC
2927 case '[':
2928 if (SvIV(sv) != 0)
2929 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2930 break;
79072805 2931 case '?':
ff0cee69 2932#ifdef COMPLEX_STATUS
6b88bc9c 2933 if (PL_localizing == 2) {
41cb7b2b 2934 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2935 PL_statusvalue = LvTARGOFF(sv);
2936 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2937 }
2938 else
2939#endif
2940#ifdef VMSISH_STATUS
2941 if (VMSISH_STATUS)
fb38d079 2942 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2943 else
2944#endif
38ab35f8 2945 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2946 break;
2947 case '!':
93189314
JH
2948 {
2949#ifdef VMS
2950# define PERL_VMS_BANG vaxc$errno
2951#else
2952# define PERL_VMS_BANG 0
2953#endif
27329181 2954#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2955 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2956 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2957#else
91487cfc 2958 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2959 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2960#endif
93189314 2961 }
79072805
LW
2962 break;
2963 case '<':
985213f2 2964 {
b469f1e0 2965 /* XXX $< currently silently ignores failures */
dfff4baf 2966 const Uid_t new_uid = SvUID(sv);
985213f2 2967 PL_delaymagic_uid = new_uid;
3280af22
NIS
2968 if (PL_delaymagic) {
2969 PL_delaymagic |= DM_RUID;
79072805
LW
2970 break; /* don't do magic till later */
2971 }
2972#ifdef HAS_SETRUID
b469f1e0 2973 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW
2974#else
2975#ifdef HAS_SETREUID
b469f1e0 2976 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 2977#else
85e6fe83 2978#ifdef HAS_SETRESUID
b469f1e0 2979 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 2980#else
985213f2 2981 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2982#ifdef PERL_DARWIN
2983 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2984 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 2985 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 2986#endif
b469f1e0 2987 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 2988 } else {
cea2e8a9 2989 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2990 }
79072805
LW
2991#endif
2992#endif
85e6fe83 2993#endif
79072805 2994 break;
985213f2 2995 }
79072805 2996 case '>':
985213f2 2997 {
b469f1e0 2998 /* XXX $> currently silently ignores failures */
dfff4baf 2999 const Uid_t new_euid = SvUID(sv);
985213f2 3000 PL_delaymagic_euid = new_euid;
3280af22
NIS
3001 if (PL_delaymagic) {
3002 PL_delaymagic |= DM_EUID;
79072805
LW
3003 break; /* don't do magic till later */
3004 }
3005#ifdef HAS_SETEUID
b469f1e0 3006 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW
3007#else
3008#ifdef HAS_SETREUID
b469f1e0 3009 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW
3010#else
3011#ifdef HAS_SETRESUID
b469f1e0 3012 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3013#else
985213f2 3014 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3015 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3016 else {
cea2e8a9 3017 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3018 }
79072805
LW
3019#endif
3020#endif
85e6fe83 3021#endif
79072805 3022 break;
985213f2 3023 }
79072805 3024 case '(':
985213f2 3025 {
b469f1e0 3026 /* XXX $( currently silently ignores failures */
dfff4baf 3027 const Gid_t new_gid = SvGID(sv);
985213f2 3028 PL_delaymagic_gid = new_gid;
3280af22
NIS
3029 if (PL_delaymagic) {
3030 PL_delaymagic |= DM_RGID;
79072805
LW
3031 break; /* don't do magic till later */
3032 }
3033#ifdef HAS_SETRGID
b469f1e0 3034 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW
3035#else
3036#ifdef HAS_SETREGID
b469f1e0 3037 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW
3038#else
3039#ifdef HAS_SETRESGID
b469f1e0 3040 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3041#else
985213f2 3042 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3043 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3044 else {
cea2e8a9 3045 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3046 }
79072805
LW
3047#endif
3048#endif
85e6fe83 3049#endif
79072805 3050 break;
985213f2 3051 }
79072805 3052 case ')':
985213f2 3053 {
0635704a
HS
3054/* (hv) best guess: maybe we'll need configure probes to do a better job,
3055 * but you can override it if you need to.
3056 */
3057#ifndef INVALID_GID
3058#define INVALID_GID ((Gid_t)-1)
3059#endif
b469f1e0 3060 /* XXX $) currently silently ignores failures */
dfff4baf 3061 Gid_t new_egid;
5cd24f17
PP
3062#ifdef HAS_SETGROUPS
3063 {
b83604b4 3064 const char *p = SvPV_const(sv, len);
757f63d8 3065 Groups_t *gary = NULL;
fdadaf77 3066 const char* endptr;
22ff3130 3067 UV uv;
fb4089e0 3068#ifdef _SC_NGROUPS_MAX
3069 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3070
3071 if (maxgrp < 0)
3072 maxgrp = NGROUPS;
3073#else
3074 int maxgrp = NGROUPS;
3075#endif
757f63d8
SP
3076
3077 while (isSPACE(*p))
3078 ++p;
22ff3130
HS
3079 if (grok_atoUV(p, &uv, &endptr))
3080 new_egid = (Gid_t)uv;
3081 else {
0635704a 3082 new_egid = INVALID_GID;
22ff3130
HS
3083 endptr = NULL;
3084 }
fb4089e0 3085 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3086 if (endptr == NULL)
3087 break;
3088 p = endptr;
757f63d8
SP
3089 while (isSPACE(*p))
3090 ++p;
3091 if (!*p)
3092 break;
fdadaf77 3093 if (!gary)
757f63d8
SP
3094 Newx(gary, i + 1, Groups_t);
3095 else
3096 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3097 if (grok_atoUV(p, &uv, &endptr))
3098 gary[i] = (Groups_t)uv;
3099 else {
0635704a 3100 gary[i] = INVALID_GID;
22ff3130
HS
3101 endptr = NULL;
3102 }
757f63d8
SP
3103 }
3104 if (i)
b469f1e0 3105 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3106 Safefree(gary);
5cd24f17
PP
3107 }
3108#else /* HAS_SETGROUPS */
dfff4baf 3109 new_egid = SvGID(sv);
5cd24f17 3110#endif /* HAS_SETGROUPS */
985213f2 3111 PL_delaymagic_egid = new_egid;
3280af22
NIS
3112 if (PL_delaymagic) {
3113 PL_delaymagic |= DM_EGID;
79072805
LW
3114 break; /* don't do magic till later */
3115 }
3116#ifdef HAS_SETEGID
b469f1e0 3117 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW
3118#else
3119#ifdef HAS_SETREGID
b469f1e0 3120 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW
3121#else
3122#ifdef HAS_SETRESGID
b469f1e0 3123 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3124#else
985213f2 3125 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3126 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3127 else {
cea2e8a9 3128 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3129 }
79072805
LW
3130#endif
3131#endif
85e6fe83 3132#endif
79072805 3133 break;
985213f2 3134 }
79072805 3135 case ':':
2d8e6c8d 3136 PL_chopset = SvPV_force(sv,len);
79072805 3137 break;
9cdac2a2
FC
3138 case '$': /* $$ */
3139 /* Store the pid in mg->mg_obj so we can tell when a fork has
3140 occurred. mg->mg_obj points to *$ by default, so clear it. */
3141 if (isGV(mg->mg_obj)) {
3142 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3143 SvREFCNT_dec(mg->mg_obj);
3144 mg->mg_flags |= MGf_REFCOUNTED;
3145 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3146 }
3147 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3148 break;
79072805 3149 case '0':
e2975953 3150 LOCK_DOLLARZERO_MUTEX;
f1540bed 3151 S_set_dollarzero(aTHX_ sv);
e2975953 3152 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3153 break;
3154 }
3155 return 0;
3156}
3157
3158I32
84c7b88c
BF
3159Perl_whichsig_sv(pTHX_ SV *sigsv)
3160{
3161 const char *sigpv;
3162 STRLEN siglen;
3163 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3164 sigpv = SvPV_const(sigsv, siglen);
3165 return whichsig_pvn(sigpv, siglen);
3166}
3167
3168I32
3169Perl_whichsig_pv(pTHX_ const char *sig)
3170{
3171 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3172 return whichsig_pvn(sig, strlen(sig));
3173}
3174
3175I32
3176Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3177{
eb578fdb 3178 char* const* sigv;
7918f24d 3179
84c7b88c 3180 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3181 PERL_UNUSED_CONTEXT;
79072805 3182
aadb217d 3183 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3184 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3185 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3186#ifdef SIGCLD
84c7b88c 3187 if (memEQs(sig, len, "CHLD"))
79072805
LW
3188 return SIGCLD;
3189#endif
3190#ifdef SIGCHLD
84c7b88c 3191 if (memEQs(sig, len, "CLD"))
79072805
LW
3192 return SIGCHLD;
3193#endif
7f1236c0 3194 return -1;
79072805
LW
3195}
3196
ecfc5424 3197Signal_t
1e82f5a6 3198#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3199Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3200#else
3201Perl_sighandler(int sig)
3202#endif
79072805 3203{
1018e26f
NIS
3204#ifdef PERL_GET_SIG_CONTEXT
3205 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3206#else
cea2e8a9 3207 dTHX;
71d280e3 3208#endif
79072805 3209 dSP;
a0714e2c
SS
3210 GV *gv = NULL;
3211 SV *sv = NULL;
8772537c 3212 SV * const tSv = PL_Sv;
601f1833 3213 CV *cv = NULL;
533c011a 3214 OP *myop = PL_op;
84902520 3215 U32 flags = 0;
8772537c 3216 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3217 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3218 SV *errsv_save = NULL;
71d280e3 3219
84902520 3220
727405f8 3221 if (!PL_psig_ptr[sig]) {
99ef548b 3222 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3223 PL_sig_name[sig]);
3224 exit(sig);
3225 }
ff0cee69 3226
a0d63a7b
DM
3227 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3228 /* Max number of items pushed there is 3*n or 4. We cannot fix
3229 infinity, so we fix 4 (in fact 5): */
3230 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3231 flags |= 1;
3232 PL_savestack_ix += 5; /* Protect save in progress. */
3233 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3234 }
84902520 3235 }
84902520 3236 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3237 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3238 || SvTYPE(cv) != SVt_PVCV) {
3239 HV *st;
f2c0649b 3240 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3241 }
84902520 3242
a0d0e21e 3243 if (!cv || !CvROOT(cv)) {
07c325bb 3244 const HEK * const hek = gv
1d6bb9ae
FC
3245 ? GvENAME_HEK(gv)
3246 : cv && CvNAMED(cv)
3247 ? CvNAME_HEK(cv)
07c325bb
FC
3248 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3249 if (hek)
3250 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3251 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3252 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3253 /* diag_listed_as: SIG%s handler "%s" not defined */
3254 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3255 "SIG%s handler \"__ANON__\" not defined.\n",
3256 PL_sig_name[sig]);
00d579c5 3257 goto cleanup;
79072805
LW
3258 }
3259
0c4d3b5e
DM
3260 sv = PL_psig_name[sig]
3261 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3262 : newSVpv(PL_sig_name[sig],0);
72048cfe 3263 flags |= 8;
0c4d3b5e
DM
3264 SAVEFREESV(sv);
3265
a0d63a7b
DM
3266 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3267 /* make sure our assumption about the size of the SAVEs are correct:
3268 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3269 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3270 }
e336de0d 3271
e788e7d3 3272 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3273 PUSHMARK(SP);
79072805 3274 PUSHs(sv);
8aad04aa
JH
3275#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3276 {
3277 struct sigaction oact;
3278
3279 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3280 if (sip) {
3281 HV *sih = newHV();
ad64d0ec 3282 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3283 /* The siginfo fields signo, code, errno, pid, uid,
3284 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3285 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3286 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3287#ifdef HAS_SIGINFO_SI_ERRNO
3288 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3289#endif
3290#ifdef HAS_SIGINFO_SI_STATUS
3291 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3292#endif
3293#ifdef HAS_SIGINFO_SI_UID
3294 {
3295 SV *uid = newSV(0);
3296 sv_setuid(uid, sip->si_uid);
3297 (void)hv_stores(sih, "uid", uid);
3298 }
3299#endif
3300#ifdef HAS_SIGINFO_SI_PID
3301 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3302#endif
3303#ifdef HAS_SIGINFO_SI_ADDR
3304 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3305#endif
3306#ifdef HAS_SIGINFO_SI_BAND
3307 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3308#endif
8aad04aa 3309 EXTEND(SP, 2);
ad64d0ec 3310 PUSHs(rv);
22f1178f 3311 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3312 }
b4552a27 3313
8aad04aa
JH
3314 }
3315 }
3316#endif
79072805 3317 PUTBACK;
a0d0e21e 3318
100c03aa
JL
3319 errsv_save = newSVsv(ERRSV);
3320
ad64d0ec 3321 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3322
d3acc0f7 3323 POPSTACK;
eed484f9
DD
3324 {
3325 SV * const errsv = ERRSV;
3326 if (SvTRUE_NN(errsv)) {
3327 SvREFCNT_dec(errsv_save);
c22d665b 3328#ifndef PERL_MICRO
1b266415
NIS
3329 /* Handler "died", for example to get out of a restart-able read().
3330 * Before we re-do that on its behalf re-enable the signal which was
3331 * blocked by the system when we entered.
3332 */
c22d665b 3333#ifdef HAS_SIGPROCMASK
d488af49 3334#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3335 if (sip || uap)
c22d665b 3336#endif
eed484f9
DD
3337 {
3338 sigset_t set;
3339 sigemptyset(&set);
3340 sigaddset(&set,sig);
3341 sigprocmask(SIG_UNBLOCK, &set, NULL);
3342 }
c22d665b 3343#else
eed484f9
DD
3344 /* Not clear if this will work */
3345 (void)rsignal(sig, SIG_IGN);
3346 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3347#endif
3348#endif /* !PERL_MICRO */
eed484f9
DD
3349 die_sv(errsv);
3350 }
3351 else {
3352 sv_setsv(errsv, errsv_save);
3353 SvREFCNT_dec(errsv_save);
3354 }
100c03aa
JL
3355 }
3356
7b52d656 3357 cleanup:
0c4d3b5e
DM
3358 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3359 PL_savestack_ix = old_ss_ix;
72048cfe 3360 if (flags & 8)
2357bae7 3361 SvREFCNT_dec_NN(sv);
533c011a 3362 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3363
3280af22
NIS
3364 PL_Sv = tSv; /* Restore global temporaries. */
3365 PL_Xpv = tXpv;
53bb94e2 3366 return;
79072805 3367}
4e35701f
NIS
3368
3369
51371543 3370static void
8772537c 3371S_restore_magic(pTHX_ const void *p)
51371543 3372{
8772537c
AL
3373 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3374 SV* const sv = mgs->mgs_sv;
150b625d 3375 bool bumped;
51371543
GS
3376
3377 if (!sv)
3378 return;
3379
4bac9ae4
CS
3380 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3381 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC
3382 if (mgs->mgs_flags)
3383 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS
3384 else
3385 mg_magical(sv);
51371543
GS
3386 }
3387
150b625d 3388 bumped = mgs->mgs_bumped;
51371543
GS
3389 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3390
3391 /* If we're still on top of the stack, pop us off. (That condition
3392 * will be satisfied if restore_magic was called explicitly, but *not*
3393 * if it's being called via leave_scope.)
3394 * The reason for doing this is that otherwise, things like sv_2cv()
3395 * may leave alloc gunk on the savestack, and some code
3396 * (e.g. sighandler) doesn't expect that...
3397 */
3398 if (PL_savestack_ix == mgs->mgs_ss_ix)
3399 {
1be36ce0
NC
3400 UV popval = SSPOPUV;
3401 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3402 PL_savestack_ix -= 2;
1be36ce0
NC
3403 popval = SSPOPUV;
3404 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3405 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3406 }
150b625d
DM
3407 if (bumped) {
3408 if (SvREFCNT(sv) == 1) {
3409 /* We hold the last reference to this SV, which implies that the
3410 SV was deleted as a side effect of the routines we called.
3411 So artificially keep it alive a bit longer.
3412 We avoid turning on the TEMP flag, which can cause the SV's
3413 buffer to get stolen (and maybe other stuff). */
150b625d 3414 sv_2mortal(sv);
4bac9ae4 3415 SvTEMP_off(sv);
8985fe98 3416 }
150b625d 3417 else
2357bae7 3418 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3419 }
51371543
GS
3420}
3421
0c4d3b5e
DM
3422/* clean up the mess created by Perl_sighandler().
3423 * Note that this is only called during an exit in a signal handler;
3424 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3425 * skipped over. */
0c4d3b5e 3426
51371543 3427static void
8772537c 3428S_unwind_handler_stack(pTHX_ const void *p)
51371543 3429{
0c4d3b5e 3430 PERL_UNUSED_ARG(p);
7918f24d 3431
0c4d3b5e 3432 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3433}
1018e26f 3434
66610fdd 3435/*
b3ca2e83
NC
3436=for apidoc magic_sethint
3437
796b6530 3438Triggered by a store to C<%^H>, records the key/value pair to
c28fe1ec
NC
3439C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3440anything that would need a deep copy. Maybe we should warn if we find a
3441reference.
b3ca2e83
NC
3442
3443=cut
3444*/
3445int
3446Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3447{
ad64d0ec 3448 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3449 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3450
7918f24d
NC
3451 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3452
e6e3e454
NC
3453 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3454 an alternative leaf in there, with PL_compiling.cop_hints being used if
3455 it's NULL. If needed for threads, the alternative could lock a mutex,
3456 or take other more complex action. */
3457
5b9c0671
NC
3458 /* Something changed in %^H, so it will need to be restored on scope exit.
3459 Doing this here saves a lot of doing it manually in perl code (and