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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 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 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)
474 : (type == PERL_MAGIC_regdata && mg->mg_obj)
475 ? sv
476 : mg->mg_obj,
477 toLOWER(type), key, klen);
478 count++;
479 }
79072805 480 }
79072805 481 }
463ee0b2 482 return count;
79072805
LW		 483}
484
954c1994 485/*
0cbee0a4
DM		 486=for apidoc mg_localize
487
9711599e 488Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW		 489SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
490gets copied, value magic doesn't (I<e.g.>,
796b6530 491C<taint>, C<pos>).
9711599e 492
796b6530 493If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 494This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 495and that will handle the magic.
0cbee0a4
DM		 496
497=cut
498*/
499
500void
af7df257 501Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM		 502{
503 MAGIC *mg;
7918f24d
NC		 504
505 PERL_ARGS_ASSERT_MG_LOCALIZE;
506
658a9f31
JD		 507 if (nsv == DEFSV)
508 return;
509
0cbee0a4 510 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 511 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 512 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 513 continue;
0cbee0a4 514
a5063e7c 515 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 516 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 517 else
0cbee0a4
DM		 518 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
519 mg->mg_ptr, mg->mg_len);
a5063e7c 520
0cbee0a4 521 /* container types should remain read-only across localization */
9ff3e6d8 522 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM		 523 }
524
525 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
526 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 527 if (setmagic) {
9711599e
CS		 528 PL_localizing = 1;
529 SvSETMAGIC(nsv);
530 PL_localizing = 0;
531 }
0cbee0a4
DM		 532 }
533}
534
d9088386
Z		 535#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
536static void
537S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
538{
539 const MGVTBL* const vtbl = mg->mg_virtual;
540 if (vtbl && vtbl->svt_free)
541 vtbl->svt_free(aTHX_ sv, mg);
542 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
543 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
544 Safefree(mg->mg_ptr);
545 else if (mg->mg_len == HEf_SVKEY)
546 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
547 }
548 if (mg->mg_flags & MGf_REFCOUNTED)
549 SvREFCNT_dec(mg->mg_obj);
550 Safefree(mg);
551}
552
0cbee0a4 553/*
954c1994
GS		 554=for apidoc mg_free
555
fbe13c60 556Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS		 557
558=cut
559*/
560
79072805 561int
864dbfa3 562Perl_mg_free(pTHX_ SV *sv)
79072805
LW		 563{
564 MAGIC* mg;
565 MAGIC* moremagic;
7918f24d
NC		 566
567 PERL_ARGS_ASSERT_MG_FREE;
568
79072805 569 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 570 moremagic = mg->mg_moremagic;
d9088386 571 mg_free_struct(sv, mg);
c826f41b 572 SvMAGIC_set(sv, moremagic);
79072805 573 }
b162af07 574 SvMAGIC_set(sv, NULL);
68f8932e 575 SvMAGICAL_off(sv);
79072805
LW		 576 return 0;
577}
578
d9088386
Z		 579/*
580=for apidoc Am|void|mg_free_type|SV *sv|int how
581
2d7f6611 582Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z		 583
584=cut
585*/
586
587void
588Perl_mg_free_type(pTHX_ SV *sv, int how)
589{
590 MAGIC *mg, *prevmg, *moremg;
591 PERL_ARGS_ASSERT_MG_FREE_TYPE;
592 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
593 MAGIC *newhead;
594 moremg = mg->mg_moremagic;
595 if (mg->mg_type == how) {
596 /* temporarily move to the head of the magic chain, in case
597 custom free code relies on this historical aspect of mg_free */
598 if (prevmg) {
599 prevmg->mg_moremagic = moremg;
600 mg->mg_moremagic = SvMAGIC(sv);
601 SvMAGIC_set(sv, mg);
602 }
603 newhead = mg->mg_moremagic;
604 mg_free_struct(sv, mg);
605 SvMAGIC_set(sv, newhead);
606 mg = prevmg;
607 }
608 }
609 mg_magical(sv);
610}
611
79072805 612#include <signal.h>
79072805 613
942e002e 614U32
864dbfa3 615Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 616{
8772537c 617 PERL_UNUSED_ARG(sv);
6cef1e77 618
7918f24d
NC		 619 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
620
0bd48802 621 if (PL_curpm) {
eb578fdb 622 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 623 if (rx) {
a678b0e4
YO		 624 if (mg->mg_obj) { /* @+ */
625 /* return the number possible */
07bc277f 626 return RX_NPARENS(rx);
a678b0e4 627 } else { /* @- */
07bc277f 628 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO		 629
630 /* return the last filled */
f46c4081 631 while ( paren >= 0
07bc277f
NC		 632 && (RX_OFFS(rx)[paren].start == -1
633 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 634 paren--;
a678b0e4
YO		 635 return (U32)paren;
636 }
0bd48802 637 }
8f580fb8 638 }
ac27b0f5 639
942e002e 640 return (U32)-1;
6cef1e77
IZ		 641}
642
6502e081
DM		 643/* @-, @+ */
644
6cef1e77 645int
864dbfa3 646Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 647{
7918f24d
NC		 648 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
649
0bd48802 650 if (PL_curpm) {
eb578fdb 651 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 652 if (rx) {
eb578fdb 653 const I32 paren = mg->mg_len;
a10eae29
FC		 654 SSize_t s;
655 SSize_t t;
0bd48802
AL		 656 if (paren < 0)
657 return 0;
07bc277f
NC		 658 if (paren <= (I32)RX_NPARENS(rx) &&
659 (s = RX_OFFS(rx)[paren].start) != -1 &&
660 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 661 {
a10eae29 662 SSize_t i;
0bd48802
AL		 663 if (mg->mg_obj) /* @+ */
664 i = t;
665 else /* @- */
666 i = s;
667
a10eae29 668 if (RX_MATCH_UTF8(rx)) {
07bc277f 669 const char * const b = RX_SUBBEG(rx);
0bd48802 670 if (b)
6502e081
DM		 671 i = RX_SUBCOFFSET(rx) +
672 utf8_length((U8*)b,
673 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 674 }
727405f8 675
a10eae29 676 sv_setuv(sv, i);
232af1f8 677 return 0;
1aa99e6b 678 }
0bd48802 679 }
6cef1e77 680 }
232af1f8 681 sv_setsv(sv, NULL);
6cef1e77
IZ		 682 return 0;
683}
684
6502e081
DM		 685/* @-, @+ */
686
e4b89193 687int
a29d06ed
MG		 688Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
689{
7918f24d 690 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 691 PERL_UNUSED_CONTEXT;
d4c19fe8
AL		 692 PERL_UNUSED_ARG(sv);
693 PERL_UNUSED_ARG(mg);
cb077ed2 694 Perl_croak_no_modify();
0dbb1585 695 NORETURN_FUNCTION_END;
a29d06ed
MG		 696}
697
ad3296c6 698#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA		 699 if (SvPOK(sv)) { \
700 STRLEN len = SvCUR(sv); \
701 char * const p = SvPVX(sv); \
8e6b4db6
PC		 702 while (len > 0 && isSPACE(p[len-1])) \
703 --len; \
704 SvCUR_set(sv, len); \
705 p[len] = '\0'; \
706 } \
ad3296c6
SH		 707} STMT_END
708
8b850bd5
NC		 709void
710Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
711{
7918f24d
NC		 712 PERL_ARGS_ASSERT_EMULATE_COP_IO;
713
8b850bd5
NC		 714 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
715 sv_setsv(sv, &PL_sv_undef);
716 else {
717 sv_setpvs(sv, "");
718 SvUTF8_off(sv);
719 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 720 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC		 721 assert(value);
722 sv_catsv(sv, value);
723 }
724 sv_catpvs(sv, "\0");
725 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 726 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC		 727 assert(value);
728 sv_catsv(sv, value);
729 }
730 }
731}
732
d9fe7d23
KW		 733STATIC void
734S_fixup_errno_string(pTHX_ SV* sv)
735{
736 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
737 * Perl space. */
738
739 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
740
741 assert(SvOK(sv));
b35e4f8b
KW		 742
743 if(strEQ(SvPVX(sv), "")) {
744 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
745 }
746 else {
d9fe7d23 747
d3c0b317
KW		 748 /* In some locales the error string may come back as UTF-8, in which
749 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW		 750 * avoid as many possible backward compatibility issues as possible, we
751 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW		 752 * an entirely invariant string. We assume that if the string looks
753 * like UTF-8, it really is UTF-8: "text in any other encoding that
754 * uses bytes with the high bit set is extremely unlikely to pass a
755 * UTF-8 validity test"
756 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
757 * potential that we will get it wrong however, especially on short
758 * error message text. (If it turns out to be necessary, we could also
759 * keep track if the current LC_MESSAGES locale is UTF-8) */
d3c0b317 760 if (! IN_BYTES /* respect 'use bytes' */
c5f058df 761 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
d3c0b317
KW		 762 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
763 {
764 SvUTF8_on(sv);
765 }
b35e4f8b 766 }
d9fe7d23
KW		 767}
768
25bbd826
CB		 769#ifdef VMS
770#include <descrip.h>
771#include <starlet.h>
772#endif
773
79072805 774int
864dbfa3 775Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 776{
eb578fdb
KW		 777 I32 paren;
778 const char *s = NULL;
779 REGEXP *rx;
823a54a3 780 const char * const remaining = mg->mg_ptr + 1;
e91d8259 781 char nextchar;
79072805 782
7918f24d
NC		 783 PERL_ARGS_ASSERT_MAGIC_GET;
784
e91d8259 785 if (!mg->mg_ptr) {
e91d8259 786 paren = mg->mg_len;
e91d8259 787 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 788 do_numbuf_fetch:
e91d8259
NC		 789 CALLREG_NUMBUF_FETCH(rx,paren,sv);
790 } else {
791 sv_setsv(sv,&PL_sv_undef);
792 }
793 return 0;
794 }
795
796 nextchar = *remaining;
79072805 797 switch (*mg->mg_ptr) {
748a9306 798 case '\001': /* ^A */
f2da823f
FC		 799 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
800 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT		 801 if (SvTAINTED(PL_bodytarget))
802 SvTAINTED_on(sv);
748a9306 803 break;
e5218da5 804 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 805 if (nextchar == '\0') {
e5218da5
GA		 806 sv_setiv(sv, (IV)PL_minus_c);
807 }
823a54a3 808 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA		 809 sv_setiv(sv, (IV)STATUS_NATIVE);
810 }
49460fe6
NIS		 811 break;
812
79072805 813 case '\004': /* ^D */
aea4f609 814 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 815 break;
28f23441 816 case '\005': /* ^E */
6c6eab55
KW		 817 if (nextchar != '\0') {
818 if (strEQ(remaining, "NCODING"))
199670db 819 sv_setsv(sv, NULL);
4f4ff3a7 820 break;
6c6eab55 821 }
4f4ff3a7
KW		 822
823#if defined(VMS) || defined(OS2) || defined(WIN32)
824# if defined(VMS)
2a99ff86
KW		 825 {
826 char msg[255];
827 $DESCRIPTOR(msgdsc,msg);
828 sv_setnv(sv,(NV) vaxc$errno);
829 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
830 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
831 else
832 sv_setpvs(sv,"");
833 }
4b645107 834#elif defined(OS2)
2a99ff86
KW		 835 if (!(_emx_env & 0x200)) { /* Under DOS */
836 sv_setnv(sv, (NV)errno);
2c6ee1a7 837 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW		 838 } else {
839 if (errno != errno_isOS2) {
840 const int tmp = _syserrno();
841 if (tmp) /* 2nd call to _syserrno() makes it 0 */
842 Perl_rc = tmp;
843 }
844 sv_setnv(sv, (NV)Perl_rc);
845 sv_setpv(sv, os2error(Perl_rc));
846 }
1534c6f5 847 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW		 848 fixup_errno_string(sv);
849 }
4f4ff3a7 850# elif defined(WIN32)
2a99ff86
KW		 851 {
852 const DWORD dwErr = GetLastError();
853 sv_setnv(sv, (NV)dwErr);
854 if (dwErr) {
855 PerlProc_GetOSError(sv, dwErr);
2efab60d 856 fixup_errno_string(sv);
2a99ff86
KW		 857 }
858 else
859 sv_setpvs(sv, "");
860 SetLastError(dwErr);
861 }
4f4ff3a7
KW		 862# else
863# error Missing code for platform
864# endif
2a99ff86
KW		 865 SvRTRIM(sv);
866 SvNOK_on(sv); /* what a wonderful hack! */
867 break;
4f4ff3a7
KW		 868#endif /* End of platforms with special handling for $^E; others just fall
869 through to $! */
46f3e16c
KW		 870
871 case '!':
872 {
5f1b979d 873 dSAVE_ERRNO;
46f3e16c 874#ifdef VMS
5f1b979d 875 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 876#else
5f1b979d 877 sv_setnv(sv, (NV)errno);
46f3e16c
KW		 878#endif
879#ifdef OS2
5f1b979d
KW		 880 if (errno == errno_isOS2 || errno == errno_isOS2_set)
881 sv_setpv(sv, os2error(Perl_rc));
882 else
46f3e16c 883#endif
5f1b979d
KW		 884 if (! errno) {
885 sv_setpvs(sv, "");
46f3e16c 886 }
5f1b979d
KW		 887 else {
888
889 /* Strerror can return NULL on some platforms, which will
890 * result in 'sv' not being considered SvOK. The SvNOK_on()
891 * below will cause just the number part to be valid */
2c6ee1a7 892 sv_setpv(sv, my_strerror(errno));
5f1b979d
KW		 893 if (SvOK(sv)) {
894 fixup_errno_string(sv);
895 }
896 }
897 RESTORE_ERRNO;
46f3e16c
KW		 898 }
899
900 SvRTRIM(sv);
901 SvNOK_on(sv); /* what a wonderful hack! */
902 break;
903
79072805 904 case '\006': /* ^F */
3280af22 905 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 906 break;
9ebf26ad
FR		 907 case '\007': /* ^GLOBAL_PHASE */
908 if (strEQ(remaining, "LOBAL_PHASE")) {
909 sv_setpvn(sv, PL_phase_names[PL_phase],
910 strlen(PL_phase_names[PL_phase]));
911 }
912 break;
a0d0e21e 913 case '\010': /* ^H */
3280af22 914 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 915 break;
9d116dd7 916 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 917 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 918 break;
8561ea1d
FC		 919 case '\014': /* ^LAST_FH */
920 if (strEQ(remaining, "AST_FH")) {
921 if (PL_last_in_gv) {
922 assert(isGV_with_GP(PL_last_in_gv));
923 SV_CHECK_THINKFIRST_COW_DROP(sv);
924 prepare_SV_for_RV(sv);
925 SvOK_off(sv);
926 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
927 SvROK_on(sv);
928 sv_rvweaken(sv);
929 }
930 else sv_setsv_nomg(sv, NULL);
931 }
932 break;
ac27b0f5 933 case '\017': /* ^O & ^OPEN */
823a54a3 934 if (nextchar == '\0') {
ac27b0f5 935 sv_setpv(sv, PL_osname);
3511154c
DM		 936 SvTAINTED_off(sv);
937 }
823a54a3 938 else if (strEQ(remaining, "PEN")) {
8b850bd5 939 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 940 }
28f23441 941 break;
9ebf26ad 942 case '\020':
a6d0b1b5 943 sv_setiv(sv, (IV)PL_perldb);
79072805 944 break;
fb73857a 945 case '\023': /* ^S */
a6d0b1b5 946 {
bc177e6b 947 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 948 SvOK_off(sv);
3280af22 949 else if (PL_in_eval)
6dc8a9e4 950 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS		 951 else
952 sv_setiv(sv, 0);
d58bf5aa 953 }
fb73857a 954 break;
79072805 955 case '\024': /* ^T */
823a54a3 956 if (nextchar == '\0') {
88e89b8a 957#ifdef BIG_TIME
7c36658b 958 sv_setnv(sv, PL_basetime);
88e89b8a 959#else
7c36658b 960 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 961#endif
7c36658b 962 }
823a54a3 963 else if (strEQ(remaining, "AINT"))
284167a5
S		 964 sv_setiv(sv, TAINTING_get
965 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 966 : 0);
7c36658b 967 break;
e07ea26a 968 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 969 if (strEQ(remaining, "NICODE"))
a05d7ebb 970 sv_setuv(sv, (UV) PL_unicode);
823a54a3 971 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 972 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC		 973 else if (strEQ(remaining, "TF8CACHE"))
974 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH		 975 break;
976 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 977 if (nextchar == '\0')
4438c4b7 978 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 979 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 980 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 981 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS		 982 }
983 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC		 984 sv_setsv(sv, &PL_sv_undef);
985 break;
013b78e8 986 }
d3a7d8c7 987 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS		 988 /* Get the bit mask for $warnings::Bits{all}, because
989 * it could have been extended by warnings::register */
4bac9ae4
CS		 990 HV * const bits = get_hv("warnings::Bits", 0);
991 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
992 if (bits_all)
993 sv_copypv(sv, *bits_all);
994 else
995 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 996 }
4438c4b7 997 else {
72dc9ed5
NC		 998 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
999 *PL_compiling.cop_warnings);
ac27b0f5 1000 }
4438c4b7 1001 }
8ca2a5d6
DD		 1002#ifdef WIN32
1003 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1004 sv_setiv(sv, w32_sloppystat);
1005 }
1006#endif
79072805 1007 break;
79072805 1008 case '+':
aaa362c4 1009 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM		 1010 paren = RX_LASTPAREN(rx);
1011 if (paren)
1012 goto do_numbuf_fetch;
79072805 1013 }
3280af22 1014 sv_setsv(sv,&PL_sv_undef);
79072805 1015 break;
a01268b5
JH		 1016 case '\016': /* ^N */
1017 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM		 1018 paren = RX_LASTCLOSEPAREN(rx);
1019 if (paren)
1020 goto do_numbuf_fetch;
a01268b5
JH		 1021 }
1022 sv_setsv(sv,&PL_sv_undef);
1023 break;
79072805 1024 case '.':
3280af22 1025 if (GvIO(PL_last_in_gv)) {
357c8808 1026 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1027 }
79072805
LW		 1028 break;
1029 case '?':
809a5acc 1030 {
809a5acc 1031 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1032#ifdef COMPLEX_STATUS
41cb7b2b 1033 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 1034 LvTARGOFF(sv) = PL_statusvalue;
1035 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1036#endif
809a5acc 1037 }
79072805
LW		 1038 break;
1039 case '^':
acbe1b9d 1040 if (GvIOp(PL_defoutgv))
099be4f1 1041 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW		 1042 if (s)
1043 sv_setpv(sv,s);
1044 else {
3280af22 1045 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1046 sv_catpvs(sv,"_TOP");
79072805
LW		 1047 }
1048 break;
1049 case '~':
acbe1b9d 1050 if (GvIOp(PL_defoutgv))
0daa599b 1051 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1052 if (!s)
3280af22 1053 s = GvENAME(PL_defoutgv);
79072805
LW		 1054 sv_setpv(sv,s);
1055 break;
79072805 1056 case '=':
099be4f1 1057 if (GvIO(PL_defoutgv))
0daa599b 1058 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW		 1059 break;
1060 case '-':
099be4f1 1061 if (GvIO(PL_defoutgv))
0daa599b 1062 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW		 1063 break;
1064 case '%':
099be4f1 1065 if (GvIO(PL_defoutgv))
0daa599b 1066 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1067 break;
79072805 1068 case ':':
79072805
LW		 1069 case '/':
1070 break;
1071 case '[':
e1dccc0d 1072 sv_setiv(sv, 0);
79072805
LW		 1073 break;
1074 case '|':
099be4f1 1075 if (GvIO(PL_defoutgv))
0daa599b 1076 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1077 break;
79072805 1078 case '\\':
b2ce0fda 1079 if (PL_ors_sv)
f28098ff 1080 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS		 1081 else
1082 sv_setsv(sv, &PL_sv_undef);
79072805 1083 break;
0e219455 1084 case '$': /* $$ */
9cdac2a2
FC		 1085 {
1086 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1087 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC		 1088 /* never set manually, or at least not since last fork */
1089 sv_setiv(sv, pid);
19db9fb7
Z		 1090 /* never unsafe, even if reading in a tainted expression */
1091 SvTAINTED_off(sv);
1092 }
9cdac2a2
FC		 1093 /* else a value has been assigned manually, so do nothing */
1094 }
0e219455 1095 break;
79072805 1096 case '<':
dfff4baf 1097 sv_setuid(sv, PerlProc_getuid());
79072805
LW		 1098 break;
1099 case '>':
dfff4baf 1100 sv_setuid(sv, PerlProc_geteuid());
79072805
LW		 1101 break;
1102 case '(':
dfff4baf 1103 sv_setgid(sv, PerlProc_getgid());
79072805
LW		 1104 goto add_groups;
1105 case ')':
dfff4baf 1106 sv_setgid(sv, PerlProc_getegid());
79072805 1107 add_groups:
79072805 1108#ifdef HAS_GETGROUPS
79072805 1109 {
57d7c65e 1110 Groups_t *gary = NULL;
375ed12a
JH		 1111 I32 i;
1112 I32 num_groups = getgroups(0, gary);
1113 if (num_groups > 0) {
1114 Newx(gary, num_groups, Groups_t);
1115 num_groups = getgroups(num_groups, gary);
1116 for (i = 0; i < num_groups; i++)
1117 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1118 Safefree(gary);
1119 }
79072805 1120 }
155aba94 1121 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1122#endif
79072805 1123 break;
79072805
LW		 1124 case '0':
1125 break;
1126 }
a0d0e21e 1127 return 0;
79072805
LW		 1128}
1129
1130int
864dbfa3 1131Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1132{
8772537c 1133 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1134
7918f24d
NC		 1135 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1136
79072805 1137 if (uf && uf->uf_val)
24f81a43 1138 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW		 1139 return 0;
1140}
1141
1142int
864dbfa3 1143Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1144{
9ae3433d 1145 STRLEN len = 0, klen;
12033064 1146 const char * const key = MgPV_const(mg,klen);
888a67f6 1147 const char *s = "";
1e422769 1148
7918f24d
NC		 1149 PERL_ARGS_ASSERT_MAGIC_SETENV;
1150
613c63b4 1151 SvGETMAGIC(sv);
12033064 1152 if (SvOK(sv)) {
613c63b4
CS		 1153 /* defined environment variables are byte strings; unfortunately
1154 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1155 (void)SvPV_force_nomg_nolen(sv);
1156 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1157 if (SvUTF8(sv)) {
1158 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1159 SvUTF8_off(sv);
1160 }
1161 s = SvPVX(sv);
1162 len = SvCUR(sv);
12033064
CS		 1163 }
1164 my_setenv(key, s); /* does the deed */
1165
a0d0e21e
LW		 1166#ifdef DYNAMIC_ENV_FETCH
1167 /* We just undefd an environment var. Is a replacement */
1168 /* waiting in the wings? */
1169 if (!len) {
6bd66ee9 1170 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1171 if (valp)
4ab59fcc 1172 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW		 1173 }
1174#endif
1e422769 1175
28542d8f 1176#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW		 1177 /* And you'll never guess what the dog had */
1178 /* in its mouth... */
284167a5 1179 if (TAINTING_get) {
1e422769 1180 MgTAINTEDDIR_off(mg);
1181#ifdef VMS
6bd66ee9 1182 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1183 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769 1184 int i = 0, j = 0;
1185
6fca0082 1186 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1187 elt = eltbuf;
1e422769 1188 do { /* DCL$PATH may be a search list */
1189 while (1) { /* as may dev portion of any element */
1190 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1191 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1192 cando_by_name(S_IWUSR,0,elt) ) {
1193 MgTAINTEDDIR_on(mg);
1194 return 0;
1195 }
1196 }
bd61b366 1197 if ((cp = strchr(elt, ':')) != NULL)
1e422769 1198 *cp = '\0';
1199 if (my_trnlnm(elt, eltbuf, j++))
1200 elt = eltbuf;
1201 else
1202 break;
1203 }
1204 j = 0;
1205 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1206 }
1207#endif /* VMS */
12033064 1208 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1209 const char * const strend = s + len;
463ee0b2 1210
70b484a8
DM		 1211 /* set MGf_TAINTEDDIR if any component of the new path is
1212 * relative or world-writeable */
463ee0b2 1213 while (s < strend) {
96827780 1214 char tmpbuf[256];
c623ac67 1215 Stat_t st;
5f74f29c 1216 I32 i;
83269ced
CB		 1217#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1218 const char path_sep = PL_perllib_sep;
f5a63d97
AL		 1219#else
1220 const char path_sep = ':';
1221#endif
ba0a4150 1222 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1223 s, strend, path_sep, &i);
463ee0b2 1224 s++;
bb7a0f54 1225 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB		 1226#ifdef __VMS
1227 /* no colon thus no device name -- assume relative path */
1228 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1229 /* Using Unix separator, e.g. under bash, so act line Unix */
1230 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB		 1231#else
1232 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1233#endif
c6ed36e1 1234 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1235 MgTAINTEDDIR_on(mg);
1e422769 1236 return 0;
1237 }
463ee0b2 1238 }
79072805
LW		 1239 }
1240 }
28542d8f 1241#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1242
79072805
LW		 1243 return 0;
1244}
1245
1246int
864dbfa3 1247Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1248{
7918f24d 1249 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1250 PERL_UNUSED_ARG(sv);
bd61b366 1251 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW		 1252 return 0;
1253}
1254
88e89b8a 1255int
864dbfa3 1256Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1257{
7918f24d 1258 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1259 PERL_UNUSED_ARG(mg);
b0269e46 1260#if defined(VMS)
cea2e8a9 1261 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1262#else
3280af22 1263 if (PL_localizing) {
fb73857a 1264 HE* entry;
b0269e46 1265 my_clearenv();
85fbaab2
NC		 1266 hv_iterinit(MUTABLE_HV(sv));
1267 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a 1268 I32 keylen;
1269 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1270 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a 1271 }
1272 }
1273#endif
1274 return 0;
1275}
1276
1277int
864dbfa3 1278Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1279{
7918f24d 1280 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL		 1281 PERL_UNUSED_ARG(sv);
1282 PERL_UNUSED_ARG(mg);
b0269e46
AB		 1283#if defined(VMS)
1284 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1285#else
1286 my_clearenv();
1287#endif
3e3baf6d 1288 return 0;
66b1d557
HM		 1289}
1290
64ca3a65 1291#ifndef PERL_MICRO
2d4fcd5e
AJ		 1292#ifdef HAS_SIGPROCMASK
1293static void
1294restore_sigmask(pTHX_ SV *save_sv)
1295{
0bd48802 1296 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1297 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ		 1298}
1299#endif
66b1d557 1300int
864dbfa3 1301Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1302{
88e89b8a 1303 /* Are we fetching a signal entry? */
708854f2 1304 int i = (I16)mg->mg_private;
7918f24d
NC		 1305
1306 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1307
708854f2 1308 if (!i) {
84c7b88c
BF		 1309 STRLEN siglen;
1310 const char * sig = MgPV_const(mg, siglen);
1311 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC		 1312 }
1313
e02bfb16 1314 if (i > 0) {
22c35a8c
GS		 1315 if(PL_psig_ptr[i])
1316 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1317 else {
46da273f 1318 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1319#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL		 1320 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1321 sigstate = SIG_IGN;
2e34cc90
CL		 1322#endif
1323#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL		 1324 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1325 sigstate = SIG_DFL;
85b332e2 1326#endif
88e89b8a 1327 /* cache state so we don't fetch it again */
8aad04aa 1328 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1329 sv_setpvs(sv,"IGNORE");
88e89b8a 1330 else
3280af22 1331 sv_setsv(sv,&PL_sv_undef);
46da273f 1332 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a 1333 SvTEMP_off(sv);
1334 }
1335 }
1336 return 0;
1337}
1338int
864dbfa3 1339Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1340{
7918f24d 1341 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1342
38a124f0 1343 magic_setsig(NULL, mg);
179c85a2 1344 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1345}
3d37d572 1346
0a8e0eff 1347Signal_t
8aad04aa 1348#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1349Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1350#else
0a8e0eff 1351Perl_csighandler(int sig)
8aad04aa 1352#endif
0a8e0eff 1353{
1018e26f
NIS		 1354#ifdef PERL_GET_SIG_CONTEXT
1355 dTHXa(PERL_GET_SIG_CONTEXT);
1356#else
85b332e2
CL		 1357 dTHX;
1358#endif
1271a1be 1359#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH		 1360#if defined(__cplusplus) && defined(__GNUC__)
1361 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1362 * parameters would be warned about. */
1363 PERL_UNUSED_ARG(sip);
1364 PERL_UNUSED_ARG(uap);
1365#endif
1271a1be 1366#endif
23ada85b 1367#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1368 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1369 if (PL_sig_ignoring[sig]) return;
85b332e2 1370#endif
2e34cc90 1371#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1372 if (PL_sig_defaulting[sig])
2e34cc90
CL		 1373#ifdef KILL_BY_SIGPRC
1374 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1375#else
1376 exit(1);
1377#endif
1378#endif
406878dd 1379 if (
853d2c32
RGS		 1380#ifdef SIGILL
1381 sig == SIGILL ||
1382#endif
1383#ifdef SIGBUS
1384 sig == SIGBUS ||
1385#endif
1386#ifdef SIGSEGV
1387 sig == SIGSEGV ||
1388#endif
1389 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1390 /* Call the perl level handler now--
31c91b43 1391 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1392#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1393 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1394#else
1395 (*PL_sighandlerp)(sig);
92807b6d 1396#endif
406878dd 1397 else {
31c91b43 1398 if (!PL_psig_pend) return;
406878dd
GA		 1399 /* Set a flag to say this signal is pending, that is awaiting delivery after
1400 * the current Perl opcode completes */
1401 PL_psig_pend[sig]++;
1402
1403#ifndef SIG_PENDING_DIE_COUNT
1404# define SIG_PENDING_DIE_COUNT 120
1405#endif
fe13d51d 1406 /* Add one to say _a_ signal is pending */
406878dd
GA		 1407 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1408 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1409 (unsigned long)SIG_PENDING_DIE_COUNT);
1410 }
0a8e0eff
NIS		 1411}
1412
2e34cc90
CL		 1413#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1414void
1415Perl_csighandler_init(void)
1416{
1417 int sig;
27da23d5 1418 if (PL_sig_handlers_initted) return;
2e34cc90
CL		 1419
1420 for (sig = 1; sig < SIG_SIZE; sig++) {
1421#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1422 dTHX;
27da23d5 1423 PL_sig_defaulting[sig] = 1;
5c1546dc 1424 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL		 1425#endif
1426#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1427 PL_sig_ignoring[sig] = 0;
2e34cc90
CL		 1428#endif
1429 }
27da23d5 1430 PL_sig_handlers_initted = 1;
2e34cc90
CL		 1431}
1432#endif
1433
7fe50b8b
LT		 1434#if defined HAS_SIGPROCMASK
1435static void
1436unblock_sigmask(pTHX_ void* newset)
1437{
dc3bf405 1438 PERL_UNUSED_CONTEXT;
7fe50b8b
LT		 1439 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1440}
1441#endif
1442
0a8e0eff
NIS		 1443void
1444Perl_despatch_signals(pTHX)
1445{
1446 int sig;
1447 PL_sig_pending = 0;
1448 for (sig = 1; sig < SIG_SIZE; sig++) {
1449 if (PL_psig_pend[sig]) {
d0166017 1450 dSAVE_ERRNO;
7fe50b8b 1451#ifdef HAS_SIGPROCMASK
55534442
LT		 1452 /* From sigaction(2) (FreeBSD man page):
1453 * | Signal routines normally execute with the signal that
1454 * | caused their invocation blocked, but other signals may
1455 * | yet occur.
1456 * Emulation of this behavior (from within Perl) is enabled
1457 * using sigprocmask
1458 */
1459 int was_blocked;
1460 sigset_t newset, oldset;
1461
1462 sigemptyset(&newset);
1463 sigaddset(&newset, sig);
1464 sigprocmask(SIG_BLOCK, &newset, &oldset);
1465 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT		 1466 if (!was_blocked) {
1467 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1468 ENTER;
1469 SAVEFREESV(save_sv);
1470 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1471 }
55534442 1472#endif
25da4428 1473 PL_psig_pend[sig] = 0;
6e324d09 1474#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1475 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1476#else
1477 (*PL_sighandlerp)(sig);
92807b6d 1478#endif
7fe50b8b 1479#ifdef HAS_SIGPROCMASK
55534442 1480 if (!was_blocked)
7fe50b8b 1481 LEAVE;
55534442 1482#endif
d0166017 1483 RESTORE_ERRNO;
0a8e0eff
NIS		 1484 }
1485 }
1486}
1487
38a124f0 1488/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1489int
864dbfa3 1490Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1491{
27da23d5 1492 dVAR;
79072805 1493 I32 i;
cbbf8932 1494 SV** svp = NULL;
2d4fcd5e
AJ		 1495 /* Need to be careful with SvREFCNT_dec(), because that can have side
1496 * effects (due to closures). We must make sure that the new disposition
1497 * is in place before it is called.
1498 */
cbbf8932 1499 SV* to_dec = NULL;
e72dc28c 1500 STRLEN len;
2d4fcd5e
AJ		 1501#ifdef HAS_SIGPROCMASK
1502 sigset_t set, save;
1503 SV* save_sv;
1504#endif
eb578fdb 1505 const char *s = MgPV_const(mg,len);
7918f24d
NC		 1506
1507 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1508
748a9306 1509 if (*s == '_') {
84c7b88c 1510 if (memEQs(s, len, "__DIE__"))
3280af22 1511 svp = &PL_diehook;
84c7b88c 1512 else if (memEQs(s, len, "__WARN__")
38a124f0
NC		 1513 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1514 /* Merge the existing behaviours, which are as follows:
1515 magic_setsig, we always set svp to &PL_warnhook
1516 (hence we always change the warnings handler)
1517 For magic_clearsig, we don't change the warnings handler if it's
1518 set to the &PL_warnhook. */
3280af22 1519 svp = &PL_warnhook;
84c7b88c
BF		 1520 } else if (sv) {
1521 SV *tmp = sv_newmortal();
1522 Perl_croak(aTHX_ "No such hook: %s",
1523 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1524 }
748a9306 1525 i = 0;
38a124f0 1526 if (svp && *svp) {
9289f461
RGS		 1527 if (*svp != PERL_WARNHOOK_FATAL)
1528 to_dec = *svp;
cbbf8932 1529 *svp = NULL;
4633a7c4 1530 }
748a9306
LW		 1531 }
1532 else {
708854f2
NC		 1533 i = (I16)mg->mg_private;
1534 if (!i) {
84c7b88c 1535 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1536 mg->mg_private = (U16)i;
708854f2 1537 }
86d86cad 1538 if (i <= 0) {
84c7b88c
BF		 1539 if (sv) {
1540 SV *tmp = sv_newmortal();
1541 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1542 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1543 }
748a9306
LW		 1544 return 0;
1545 }
2d4fcd5e
AJ		 1546#ifdef HAS_SIGPROCMASK
1547 /* Avoid having the signal arrive at a bad time, if possible. */
1548 sigemptyset(&set);
1549 sigaddset(&set,i);
1550 sigprocmask(SIG_BLOCK, &set, &save);
1551 ENTER;
9ff8e806 1552 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ		 1553 SAVEFREESV(save_sv);
1554 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1555#endif
1556 PERL_ASYNC_CHECK();
2e34cc90 1557#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1558 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1559#endif
23ada85b 1560#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1561 PL_sig_ignoring[i] = 0;
85b332e2 1562#endif
2e34cc90 1563#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1564 PL_sig_defaulting[i] = 0;
2e34cc90 1565#endif
2d4fcd5e 1566 to_dec = PL_psig_ptr[i];
38a124f0
NC		 1567 if (sv) {
1568 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1569 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC		 1570
1571 /* Signals don't change name during the program's execution, so once
1572 they're cached in the appropriate slot of PL_psig_name, they can
1573 stay there.
1574
1575 Ideally we'd find some way of making SVs at (C) compile time, or
1576 at least, doing most of the work. */
1577 if (!PL_psig_name[i]) {
1578 PL_psig_name[i] = newSVpvn(s, len);
1579 SvREADONLY_on(PL_psig_name[i]);
1580 }
38a124f0 1581 } else {
79fd3822 1582 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC		 1583 PL_psig_name[i] = NULL;
1584 PL_psig_ptr[i] = NULL;
1585 }
748a9306 1586 }
38a124f0 1587 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1588 if (i) {
5c1546dc 1589 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1590 }
748a9306 1591 else
b37c2d43 1592 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1593 } else {
9dfa190b
NC		 1594 if (sv && SvOK(sv)) {
1595 s = SvPV_force(sv, len);
1596 } else {
1597 sv = NULL;
1598 }
84c7b88c 1599 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1600 if (i) {
23ada85b 1601#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC		 1602 PL_sig_ignoring[i] = 1;
1603 (void)rsignal(i, PL_csighandlerp);
85b332e2 1604#else
9dfa190b 1605 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1606#endif
9dfa190b 1607 }
2d4fcd5e 1608 }
84c7b88c 1609 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1610 if (i) {
2e34cc90 1611#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC		 1612 PL_sig_defaulting[i] = 1;
1613 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1614#else
9dfa190b 1615 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1616#endif
9dfa190b
NC		 1617 }
1618 }
1619 else {
1620 /*
1621 * We should warn if HINT_STRICT_REFS, but without
1622 * access to a known hint bit in a known OP, we can't
1623 * tell whether HINT_STRICT_REFS is in force or not.
1624 */
1625 if (!strchr(s,':') && !strchr(s,'\''))
1626 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1627 SV_GMAGIC);
1628 if (i)
1629 (void)rsignal(i, PL_csighandlerp);
1630 else
1631 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1632 }
748a9306 1633 }
9dfa190b 1634
2d4fcd5e
AJ		 1635#ifdef HAS_SIGPROCMASK
1636 if(i)
1637 LEAVE;
1638#endif
ef8d46e8 1639 SvREFCNT_dec(to_dec);
79072805
LW		 1640 return 0;
1641}
64ca3a65 1642#endif /* !PERL_MICRO */
79072805
LW		 1643
1644int
864dbfa3 1645Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1646{
7918f24d 1647 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1648 PERL_UNUSED_ARG(sv);
e1a479c5 1649
89c14e2e 1650 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1651 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB		 1652 return 0;
1653
0e446081 1654 return magic_clearisa(NULL, mg);
463ee0b2
LW		 1655}
1656
0e446081 1657/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1658int
52b45067
RD		 1659Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1660{
52b45067 1661 HV* stash;
7918f24d
NC		 1662 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1663
52b45067 1664 /* Bail out if destruction is going on */
627364f1 1665 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1666
0e446081
NC		 1667 if (sv)
1668 av_clear(MUTABLE_AV(sv));
52b45067 1669
6624142a
FC		 1670 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1671 /* This occurs with setisa_elem magic, which calls this
1672 same function. */
1673 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1674
316ebaf2 1675 assert(mg);
6624142a
FC		 1676 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1677 SV **svp = AvARRAY((AV *)mg->mg_obj);
1678 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1679 while (items--) {
1680 stash = GvSTASH((GV *)*svp++);
1681 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1682 }
1683
1684 return 0;
1685 }
1686
52b45067 1687 stash = GvSTASH(
6624142a 1688 (const GV *)mg->mg_obj
52b45067
RD		 1689 );
1690
00169e2c
FC		 1691 /* The stash may have been detached from the symbol table, so check its
1692 name before doing anything. */
1693 if (stash && HvENAME_get(stash))
5562fa71 1694 mro_isa_changed_in(stash);
52b45067
RD		 1695
1696 return 0;
1697}
1698
1699int
864dbfa3 1700Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1701{
85fbaab2 1702 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1703 I32 i = 0;
7918f24d
NC		 1704
1705 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1706 PERL_UNUSED_ARG(mg);
7719e241 1707
6ff81951 1708 if (hv) {
497b47a8 1709 (void) hv_iterinit(hv);
ad64d0ec 1710 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1711 i = HvUSEDKEYS(hv);
497b47a8
JH		 1712 else {
1713 while (hv_iternext(hv))
1714 i++;
1715 }
6ff81951
GS		 1716 }
1717
1718 sv_setiv(sv, (IV)i);
1719 return 0;
1720}
1721
1722int
864dbfa3 1723Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1724{
7918f24d 1725 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1726 PERL_UNUSED_ARG(mg);
946ec16e 1727 if (LvTARG(sv)) {
85fbaab2 1728 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e 1729 }
1730 return 0;
ac27b0f5 1731}
946ec16e 1732
efaf3674
DM		 1733/*
1734=for apidoc magic_methcall
1735
1736Invoke a magic method (like FETCH).
1737
2baee27b
FC		 1738C<sv> and C<mg> are the tied thingy and the tie magic.
1739
1740C<meth> is the name of the method to call.
1741
1742C<argc> is the number of args (in addition to $self) to pass to the method.
1743
1744The C<flags> can be:
1745
1746 G_DISCARD invoke method with G_DISCARD flag and don't
1747 return a value
1748 G_UNDEF_FILL fill the stack with argc pointers to
1749 PL_sv_undef
1750
1751The arguments themselves are any values following the C<flags> argument.
efaf3674 1752
796b6530 1753Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM		 1754
1755
1756=cut
1757*/
1758
1759SV*
36925d9e 1760Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1761 U32 argc, ...)
a0d0e21e
LW		 1762{
1763 dSP;
efaf3674 1764 SV* ret = NULL;
463ee0b2 1765
7918f24d
NC		 1766 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1767
efaf3674 1768 ENTER;
d1d7a15d
NC		 1769
1770 if (flags & G_WRITING_TO_STDERR) {
1771 SAVETMPS;
1772
2782061f 1773 save_re_context();
d1d7a15d
NC		 1774 SAVESPTR(PL_stderrgv);
1775 PL_stderrgv = NULL;
1776 }
1777
efaf3674 1778 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1779 PUSHMARK(SP);
efaf3674 1780
052a7c76
DM		 1781 /* EXTEND() expects a signed argc; don't wrap when casting */
1782 assert(argc <= I32_MAX);
1783 EXTEND(SP, (I32)argc+1);
67549bd2
NC		 1784 PUSHs(SvTIED_obj(sv, mg));
1785 if (flags & G_UNDEF_FILL) {
1786 while (argc--) {
efaf3674 1787 PUSHs(&PL_sv_undef);
93965878 1788 }
67549bd2 1789 } else if (argc > 0) {
046b0c7d
NC		 1790 va_list args;
1791 va_start(args, argc);
1792
1793 do {
1794 SV *const sv = va_arg(args, SV *);
1795 PUSHs(sv);
1796 } while (--argc);
1797
1798 va_end(args);
88e89b8a 1799 }
463ee0b2 1800 PUTBACK;
efaf3674 1801 if (flags & G_DISCARD) {
36925d9e 1802 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM		 1803 }
1804 else {
36925d9e 1805 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM		 1806 ret = *PL_stack_sp--;
1807 }
1808 POPSTACK;
d1d7a15d
NC		 1809 if (flags & G_WRITING_TO_STDERR)
1810 FREETMPS;
efaf3674
DM		 1811 LEAVE;
1812 return ret;
1813}
1814
efaf3674 1815/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1816
efaf3674 1817STATIC SV*
36925d9e 1818S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM		 1819 int n, SV *val)
1820{
efaf3674
DM		 1821 SV* arg1 = NULL;
1822
1823 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1824
1825 if (mg->mg_ptr) {
1826 if (mg->mg_len >= 0) {
db4b3a1d 1827 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM		 1828 }
1829 else if (mg->mg_len == HEf_SVKEY)
1830 arg1 = MUTABLE_SV(mg->mg_ptr);
1831 }
1832 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1833 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM		 1834 sv_2mortal(arg1);
1835 }
1836 if (!arg1) {
046b0c7d 1837 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1838 }
046b0c7d 1839 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e 1840}
1841
76e3520e 1842STATIC int
36925d9e 1843S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1844{
efaf3674 1845 SV* ret;
463ee0b2 1846
7918f24d
NC		 1847 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1848
efaf3674
DM		 1849 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1850 if (ret)
1851 sv_setsv(sv, ret);
a0d0e21e
LW		 1852 return 0;
1853}
463ee0b2 1854
a0d0e21e 1855int
864dbfa3 1856Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1857{
7918f24d
NC		 1858 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1859
fd69380d 1860 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1861 mg->mg_flags |= MGf_GSKIP;
36925d9e 1862 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW		 1863 return 0;
1864}
1865
1866int
864dbfa3 1867Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1868{
b112cff9
DM		 1869 MAGIC *tmg;
1870 SV *val;
7918f24d
NC		 1871
1872 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1873
b112cff9
DM		 1874 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1875 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1876 * public flags indicate its value based on copying from $val. Doing
1877 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1878 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1879 * wrong if $val happened to be tainted, as sv hasn't got magic
1880 * enabled, even though taint magic is in the chain. In which case,
1881 * fake up a temporary tainted value (this is easier than temporarily
1882 * re-enabling magic on sv). */
1883
284167a5 1884 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM		 1885 && (tmg->mg_len & 1))
1886 {
1887 val = sv_mortalcopy(sv);
1888 SvTAINTED_on(val);
1889 }
1890 else
1891 val = sv;
1892
36925d9e 1893 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW		 1894 return 0;
1895}
1896
1897int
864dbfa3 1898Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1899{
7918f24d
NC		 1900 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1901
4c13be3f 1902 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1903 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1904}
463ee0b2 1905
93965878
NIS		 1906
1907U32
864dbfa3 1908Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1909{
22846ab4 1910 I32 retval = 0;
efaf3674 1911 SV* retsv;
93965878 1912
7918f24d
NC		 1913 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1914
36925d9e 1915 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM		 1916 if (retsv) {
1917 retval = SvIV(retsv)-1;
22846ab4
AB		 1918 if (retval < -1)
1919 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1920 }
22846ab4 1921 return (U32) retval;
93965878
NIS		 1922}
1923
cea2e8a9
GS		 1924int
1925Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1926{
7918f24d
NC		 1927 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1928
36925d9e 1929 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW		 1930 return 0;
1931}
1932
1933int
864dbfa3 1934Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1935{
efaf3674 1936 SV* ret;
463ee0b2 1937
7918f24d
NC		 1938 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1939
36925d9e
RZ		 1940 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1941 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM		 1942 if (ret)
1943 sv_setsv(key,ret);
79072805
LW		 1944 return 0;
1945}
1946
1947int
1146e912 1948Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1949{
7918f24d
NC		 1950 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1951
36925d9e 1952 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1953}
a0d0e21e 1954
a3bcc51e
TP		 1955SV *
1956Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1957{
5fcbf73d 1958 SV *retval;
ad64d0ec
NC		 1959 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1960 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1961
7918f24d
NC		 1962 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1963
a3bcc51e
TP		 1964 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1965 SV *key;
bfcb3514 1966 if (HvEITER_get(hv))
a3bcc51e
TP		 1967 /* we are in an iteration so the hash cannot be empty */
1968 return &PL_sv_yes;
1969 /* no xhv_eiter so now use FIRSTKEY */
1970 key = sv_newmortal();
ad64d0ec 1971 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1972 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP		 1973 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1974 }
1975
1976 /* there is a SCALAR method that we can call */
36925d9e 1977 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1978 if (!retval)
5fcbf73d 1979 retval = &PL_sv_undef;
a3bcc51e
TP		 1980 return retval;
1981}
1982
a0d0e21e 1983int
864dbfa3 1984Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1985{
089b5c60 1986 SV **svp;
7918f24d
NC		 1987
1988 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1989
089b5c60
NC		 1990 /* The magic ptr/len for the debugger's hash should always be an SV. */
1991 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
1992 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 1993 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC		 1994 }
1995
1996 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
1997 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC		 1998 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
1999 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2000
8772537c 2001 if (svp && SvIOKp(*svp)) {
88df5f01
FC		 2002 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2003 if (o) {
2004#ifdef PERL_DEBUG_READONLY_OPS
2005 Slab_to_rw(OpSLAB(o));
2006#endif
2007 /* set or clear breakpoint in the relevant control op */
089b5c60 2008 if (SvTRUE(sv))
88df5f01 2009 o->op_flags |= OPf_SPECIAL;
8772537c 2010 else
88df5f01
FC		 2011 o->op_flags &= ~OPf_SPECIAL;
2012#ifdef PERL_DEBUG_READONLY_OPS
2013 Slab_to_ro(OpSLAB(o));
2014#endif
8772537c 2015 }
5df8de69 2016 }
79072805
LW		 2017 return 0;
2018}
2019
2020int
8772537c 2021Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2022{
502c6561 2023 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2024
2025 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2026
83bf042f 2027 if (obj) {
e1dccc0d 2028 sv_setiv(sv, AvFILL(obj));
83bf042f 2029 } else {
d4a823b3 2030 sv_setsv(sv, NULL);
83bf042f 2031 }
79072805
LW		 2032 return 0;
2033}
2034
2035int
864dbfa3 2036Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2037{
502c6561 2038 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2039
2040 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2041
83bf042f 2042 if (obj) {
e1dccc0d 2043 av_fill(obj, SvIV(sv));
83bf042f 2044 } else {
a2a5de95
NC		 2045 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2046 "Attempt to set length of freed array");
83bf042f
NC		 2047 }
2048 return 0;
2049}
2050
2051int
83f29afa
VP		 2052Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2053{
83f29afa
VP		 2054 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2055 PERL_UNUSED_ARG(sv);
dc3bf405 2056 PERL_UNUSED_CONTEXT;
83f29afa
VP		 2057
2058 /* Reset the iterator when the array is cleared */
3565fbf3
VP		 2059#if IVSIZE == I32SIZE
2060 *((IV *) &(mg->mg_len)) = 0;
2061#else
83f29afa
VP		 2062 if (mg->mg_ptr)
2063 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2064#endif
83f29afa
VP		 2065
2066 return 0;
2067}
2068
2069int
83bf042f
NC		 2070Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2071{
7918f24d 2072 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2073 PERL_UNUSED_ARG(sv);
7918f24d 2074
94f3782b
DM		 2075 /* during global destruction, mg_obj may already have been freed */
2076 if (PL_in_clean_all)
1ea47f64 2077 return 0;
94f3782b 2078
83bf042f
NC		 2079 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2080
2081 if (mg) {
2082 /* arylen scalar holds a pointer back to the array, but doesn't own a
2083 reference. Hence the we (the array) are about to go away with it
2084 still pointing at us. Clear its pointer, else it would be pointing
2085 at free memory. See the comment in sv_magic about reference loops,
2086 and why it can't own a reference to us. */
2087 mg->mg_obj = 0;
2088 }
a0d0e21e
LW		 2089 return 0;
2090}
2091
2092int
864dbfa3 2093Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2094{
16eb5365 2095 SV* const lsv = LvTARG(sv);
96c2a8ff 2096 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC		 2097
2098 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2099 PERL_UNUSED_ARG(mg);
ac27b0f5 2100
6174b39a
FC		 2101 if (found && found->mg_len != -1) {
2102 STRLEN i = found->mg_len;
25fdce4a 2103 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC		 2104 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2105 sv_setuv(sv, i);
a0d0e21e 2106 return 0;
a0d0e21e 2107 }
35995e5c 2108 sv_setsv(sv,NULL);
a0d0e21e
LW		 2109 return 0;
2110}
2111
2112int
864dbfa3 2113Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2114{
16eb5365 2115 SV* const lsv = LvTARG(sv);
a0d0e21e
LW		 2116 SSize_t pos;
2117 STRLEN len;
c00206c8 2118 STRLEN ulen = 0;
53d44271 2119 MAGIC* found;
aec43834 2120 const char *s;
a0d0e21e 2121
7918f24d 2122 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2123 PERL_UNUSED_ARG(mg);
ac27b0f5 2124
96c2a8ff 2125 found = mg_find_mglob(lsv);
3881461a 2126 if (!found) {
a0d0e21e
LW		 2127 if (!SvOK(sv))
2128 return 0;
96c2a8ff 2129 found = sv_magicext_mglob(lsv);
a0d0e21e
LW		 2130 }
2131 else if (!SvOK(sv)) {
3881461a 2132 found->mg_len = -1;
a0d0e21e
LW		 2133 return 0;
2134 }
aec43834 2135 s = SvPV_const(lsv, len);
a0d0e21e 2136
e1dccc0d 2137 pos = SvIV(sv);
a0ed51b3 2138
7e2040f0 2139 if (DO_UTF8(lsv)) {
aec43834 2140 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW		 2141 if (ulen)
2142 len = ulen;
a0ed51b3
LW		 2143 }
2144
a0d0e21e
LW		 2145 if (pos < 0) {
2146 pos += len;
2147 if (pos < 0)
2148 pos = 0;
2149 }
eb160463 2150 else if (pos > (SSize_t)len)
a0d0e21e 2151 pos = len;
a0ed51b3 2152
3881461a 2153 found->mg_len = pos;
25fdce4a 2154 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2155
79072805
LW		 2156 return 0;
2157}
2158
2159int
864dbfa3 2160Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS		 2161{
2162 STRLEN len;
35a4481c 2163 SV * const lsv = LvTARG(sv);
b83604b4 2164 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB		 2165 STRLEN offs = LvTARGOFF(sv);
2166 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC		 2167 const bool negoff = LvFLAGS(sv) & 1;
2168 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC		 2169
2170 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2171 PERL_UNUSED_ARG(mg);
6ff81951 2172
83f78d1a 2173 if (!translate_substr_offsets(
4ddea69a 2174 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC		 2175 negoff ? -(IV)offs : (IV)offs, !negoff,
2176 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2177 )) {
2178 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2179 sv_setsv_nomg(sv, &PL_sv_undef);
2180 return 0;
2181 }
2182
9aa983d2 2183 if (SvUTF8(lsv))
4ddea69a 2184 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2185 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2186 if (SvUTF8(lsv))
2ef4b674 2187 SvUTF8_on(sv);
6ff81951
GS		 2188 return 0;
2189}
2190
2191int
864dbfa3 2192Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2193{
83f78d1a 2194 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2195 const char * const tmps = SvPV_const(sv, len);
dd374669 2196 SV * const lsv = LvTARG(sv);
777f7c56
EB		 2197 STRLEN lvoff = LvTARGOFF(sv);
2198 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC		 2199 const bool negoff = LvFLAGS(sv) & 1;
2200 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC		 2201
2202 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2203 PERL_UNUSED_ARG(mg);
075a4a2b 2204
a74fb2cd
FC		 2205 SvGETMAGIC(lsv);
2206 if (SvROK(lsv))
2207 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2208 "Attempt to use reference as lvalue in substr"
2209 );
fc061ed8
FC		 2210 SvPV_force_nomg(lsv,lsv_len);
2211 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC		 2212 if (!translate_substr_offsets(
2213 lsv_len,
2214 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2215 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2216 ))
2217 Perl_croak(aTHX_ "substr outside of string");
2218 oldtarglen = lvlen;
1aa99e6b 2219 if (DO_UTF8(sv)) {
73a087f0 2220 sv_utf8_upgrade_nomg(lsv);
d931b1be 2221 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2222 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2223 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH		 2224 SvUTF8_on(lsv);
2225 }
0d336106 2226 else if (SvUTF8(lsv)) {
5fcbf73d 2227 const char *utf8;
d931b1be 2228 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2229 newtarglen = len;
5fcbf73d 2230 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2231 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2232 Safefree(utf8);
1aa99e6b 2233 }
b76f3ce2 2234 else {
a74fb2cd 2235 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2236 newtarglen = len;
b76f3ce2 2237 }
83f78d1a
FC		 2238 if (!neglen) LvTARGLEN(sv) = newtarglen;
2239 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2240
79072805
LW		 2241 return 0;
2242}
2243
2244int
864dbfa3 2245Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2246{
7918f24d 2247 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2248 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM		 2249#ifdef NO_TAINT_SUPPORT
2250 PERL_UNUSED_ARG(mg);
2251#endif
7918f24d 2252
64ff300b 2253 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW		 2254 return 0;
2255}
2256
2257int
864dbfa3 2258Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2259{
7918f24d 2260 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2261 PERL_UNUSED_ARG(sv);
7918f24d 2262
b01e650a 2263 /* update taint status */
284167a5 2264 if (TAINT_get)
b01e650a
DM		 2265 mg->mg_len |= 1;
2266 else
2267 mg->mg_len &= ~1;
463ee0b2
LW		 2268 return 0;
2269}
2270
2271int
864dbfa3 2272Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2273{
35a4481c 2274 SV * const lsv = LvTARG(sv);
7918f24d
NC		 2275
2276 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2277 PERL_UNUSED_ARG(mg);
6ff81951 2278
2e9e14dd 2279 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2280
6ff81951
GS		 2281 return 0;
2282}
2283
2284int
864dbfa3 2285Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2286{
7918f24d 2287 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2288 PERL_UNUSED_ARG(mg);
79072805
LW		 2289 do_vecset(sv); /* XXX slurp this routine */
2290 return 0;
2291}
2292
13733cde
FC		 2293SV *
2294Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2295{
a0714e2c 2296 SV *targ = NULL;
13733cde
FC		 2297 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2298 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2299 assert(mg);
5f05dabc 2300 if (LvTARGLEN(sv)) {
68dc0745 2301 if (mg->mg_obj) {
8772537c 2302 SV * const ahv = LvTARG(sv);
85fbaab2 2303 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS		 2304 if (he)
2305 targ = HeVAL(he);
68dc0745 2306 }
bbfdc870 2307 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2308 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2309 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC		 2310 {
2311 if (SvRMAGICAL(av)) {
2312 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2313 targ = svp ? *svp : NULL;
2314 }
2315 else
bbfdc870 2316 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2317 }
68dc0745 2318 }
46da273f 2319 if (targ && (targ != &PL_sv_undef)) {
68dc0745 2320 /* somebody else defined it for us */
2321 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2322 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745 2323 LvTARGLEN(sv) = 0;
2324 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2325 mg->mg_obj = NULL;
68dc0745 2326 mg->mg_flags &= ~MGf_REFCOUNTED;
2327 }
13733cde 2328 return targ;
5f05dabc 2329 }
71be2cbc 2330 else
13733cde
FC		 2331 return LvTARG(sv);
2332}
2333
2334int
2335Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2336{
2337 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2338
2339 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc 2340 return 0;
2341}
2342
2343int
864dbfa3 2344Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2345{
7918f24d 2346 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2347 PERL_UNUSED_ARG(mg);
71be2cbc 2348 if (LvTARGLEN(sv))
68dc0745 2349 vivify_defelem(sv);
2350 if (LvTARG(sv)) {
5f05dabc 2351 sv_setsv(LvTARG(sv), sv);
68dc0745 2352 SvSETMAGIC(LvTARG(sv));
2353 }
5f05dabc 2354 return 0;
2355}
2356
71be2cbc 2357void
864dbfa3 2358Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2359{
74e13ce4 2360 MAGIC *mg;
a0714e2c 2361 SV *value = NULL;
71be2cbc 2362
7918f24d
NC		 2363 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2364
14befaf4 2365 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2366 return;
68dc0745 2367 if (mg->mg_obj) {
8772537c 2368 SV * const ahv = LvTARG(sv);
85fbaab2 2369 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS		 2370 if (he)
2371 value = HeVAL(he);
3280af22 2372 if (!value || value == &PL_sv_undef)
be2597df 2373 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2374 }
bbfdc870
FC		 2375 else if (LvSTARGOFF(sv) < 0)
2376 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2377 else {
502c6561 2378 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2379 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2380 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2381 else {
bbfdc870 2382 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2383 if (!svp || !(value = *svp))
bbfdc870 2384 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2385 }
2386 }
b37c2d43 2387 SvREFCNT_inc_simple_void(value);
68dc0745 2388 SvREFCNT_dec(LvTARG(sv));
2389 LvTARG(sv) = value;
71be2cbc 2390 LvTARGLEN(sv) = 0;
68dc0745 2391 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2392 mg->mg_obj = NULL;
68dc0745 2393 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc 2394}
2395
2396int
864dbfa3 2397Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2398{
7918f24d 2399 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM		 2400 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2401 return 0;
810b8aa5
GS		 2402}
2403
2404int
864dbfa3 2405Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2406{
7918f24d 2407 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2408 PERL_UNUSED_CONTEXT;
0177730e 2409 PERL_UNUSED_ARG(sv);
565764a8 2410 mg->mg_len = -1;
93a17b20
LW		 2411 return 0;
2412}
2413
2414int
864dbfa3 2415Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2416{
35a4481c 2417 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2418
7918f24d
NC		 2419 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2420
79072805 2421 if (uf && uf->uf_set)
24f81a43 2422 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW		 2423 return 0;
2424}
2425
c277df42 2426int
faf82a0b
AE		 2427Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2428{
488344d2 2429 const char type = mg->mg_type;
7918f24d
NC		 2430
2431 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2432
488344d2
NC		 2433 if (type == PERL_MAGIC_qr) {
2434 } else if (type == PERL_MAGIC_bm) {
2435 SvTAIL_off(sv);
2436 SvVALID_off(sv);
2437 } else {
2438 assert(type == PERL_MAGIC_fm);
488344d2
NC		 2439 }
2440 return sv_unmagic(sv, type);
faf82a0b
AE		 2441}
2442
7a4c00b4 2443#ifdef USE_LOCALE_COLLATE
79072805 2444int
864dbfa3 2445Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2446{
7918f24d
NC		 2447 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2448
bbce6d69 2449 /*
838b5b74 2450 * RenE<eacute> Descartes said "I think not."
bbce6d69 2451 * and vanished with a faint plop.
2452 */
96a5add6 2453 PERL_UNUSED_CONTEXT;
8772537c 2454 PERL_UNUSED_ARG(sv);
7a4c00b4 2455 if (mg->mg_ptr) {
2456 Safefree(mg->mg_ptr);
2457 mg->mg_ptr = NULL;
565764a8 2458 mg->mg_len = -1;
7a4c00b4 2459 }
bbce6d69 2460 return 0;
2461}
7a4c00b4 2462#endif /* USE_LOCALE_COLLATE */
bbce6d69 2463
7e8c5dac
HS		 2464/* Just clear the UTF-8 cache data. */
2465int
2466Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2467{
7918f24d 2468 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2469 PERL_UNUSED_CONTEXT;
8772537c 2470 PERL_UNUSED_ARG(sv);
7e8c5dac 2471 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2472 mg->mg_ptr = NULL;
7e8c5dac
HS		 2473 mg->mg_len = -1; /* The mg_len holds the len cache. */
2474 return 0;
2475}
2476
bbce6d69 2477int
9cce4f9a
FC		 2478Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2479{
9782ce69 2480 const char *bad = NULL;
9cce4f9a 2481 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2482 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC		 2483 switch (mg->mg_private & OPpLVREF_TYPE) {
2484 case OPpLVREF_SV:
2485 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2486 bad = " SCALAR";
2487 break;
2488 case OPpLVREF_AV:
2489 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2490 bad = "n ARRAY";
2491 break;
2492 case OPpLVREF_HV:
2493 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2494 bad = " HASH";
2495 break;
2496 case OPpLVREF_CV:
2497 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2498 bad = " CODE";
2499 }
2500 if (bad)
26a50d99 2501 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2502 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC		 2503 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2504 case 0:
2505 {
2506 SV * const old = PAD_SV(mg->mg_len);
2507 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2508 SvREFCNT_dec(old);
2509 break;
2510 }
2511 case SVt_PVGV:
2512 gv_setref(mg->mg_obj, sv);
2513 SvSETMAGIC(mg->mg_obj);
6102323a
FC		 2514 break;
2515 case SVt_PVAV:
2516 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2517 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC		 2518 break;
2519 case SVt_PVHV:
7fcb36d5
JH		 2520 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2521 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2522 }
d39c26a6
FC		 2523 if (mg->mg_flags & MGf_PERSIST)
2524 NOOP; /* This sv is in use as an iterator var and will be reused,
2525 so we must leave the magic. */
2526 else
2527 /* This sv could be returned by the assignment op, so clear the
2528 magic, as lvrefs are an implementation detail that must not be
2529 leaked to the user. */
2530 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC		 2531 return 0;
2532}
2533
f1540bed
JH		 2534static void
2535S_set_dollarzero(pTHX_ SV *sv)
2536 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2537{
2538#ifdef USE_ITHREADS
2539 dVAR;
2540#endif
2541 const char *s;
2542 STRLEN len;
f1540bed
JH		 2543#ifdef HAS_SETPROCTITLE
2544 /* The BSDs don't show the argv[] in ps(1) output, they
2545 * show a string from the process struct and provide
2546 * the setproctitle() routine to manipulate that. */
2547 if (PL_origalen != 1) {
2548 s = SvPV_const(sv, len);
2549# if __FreeBSD_version > 410001
2550 /* The leading "-" removes the "perl: " prefix,
2551 * but not the "(perl) suffix from the ps(1)
2552 * output, because that's what ps(1) shows if the
2553 * argv[] is modified. */
2554 setproctitle("-%s", s);
2555# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2556 /* This doesn't really work if you assume that
2557 * $0 = 'foobar'; will wipe out 'perl' from the $0
2558 * because in ps(1) output the result will be like
2559 * sprintf("perl: %s (perl)", s)
2560 * I guess this is a security feature:
2561 * one (a user process) cannot get rid of the original name.
2562 * --jhi */
2563 setproctitle("%s", s);
2564# endif
2565 }
2566#elif defined(__hpux) && defined(PSTAT_SETCMD)
2567 if (PL_origalen != 1) {
2568 union pstun un;
2569 s = SvPV_const(sv, len);
2570 un.pst_command = (char *)s;
2571 pstat(PSTAT_SETCMD, un, len, 0, 0);
2572 }
2573#else
2574 if (PL_origalen > 1) {
4f3e04fd 2575 I32 i;
f1540bed
JH		 2576 /* PL_origalen is set in perl_parse(). */
2577 s = SvPV_force(sv,len);
2578 if (len >= (STRLEN)PL_origalen-1) {
2579 /* Longer than original, will be truncated. We assume that
2580 * PL_origalen bytes are available. */
2581 Copy(s, PL_origargv[0], PL_origalen-1, char);
2582 }
2583 else {
2584 /* Shorter than original, will be padded. */
2585#ifdef PERL_DARWIN
2586 /* Special case for Mac OS X: see [perl #38868] */
2587 const int pad = 0;
2588#else
2589 /* Is the space counterintuitive? Yes.
2590 * (You were expecting \0?)
2591 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2592 * --jhi */
2593 const int pad = ' ';
2594#endif
2595 Copy(s, PL_origargv[0], len, char);
2596 PL_origargv[0][len] = 0;
2597 memset(PL_origargv[0] + len + 1,
2598 pad, PL_origalen - len - 1);
2599 }
2600 PL_origargv[0][PL_origalen-1] = 0;
2601 for (i = 1; i < PL_origargc; i++)
2602 PL_origargv[i] = 0;
2603#ifdef HAS_PRCTL_SET_NAME
2604 /* Set the legacy process name in addition to the POSIX name on Linux */
2605 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2606 /* diag_listed_as: SKIPME */
2607 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2608 }
2609#endif
2610 }
2611#endif
2612}
2613
9cce4f9a 2614int
864dbfa3 2615Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2616{
20b7effb 2617#ifdef USE_ITHREADS
97aff369 2618 dVAR;
20b7effb 2619#endif
eb578fdb
KW		 2620 I32 paren;
2621 const REGEXP * rx;
79072805 2622 I32 i;
8990e307 2623 STRLEN len;
125b9982 2624 MAGIC *tmg;
2fdbfb4d 2625
7918f24d
NC		 2626 PERL_ARGS_ASSERT_MAGIC_SET;
2627
e91d8259 2628 if (!mg->mg_ptr) {
960b831f 2629 paren = mg->mg_len;
1e05feb3 2630 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2631 setparen_got_rx:
2fdbfb4d 2632 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2633 } else {
2fdbfb4d
AB		 2634 /* Croak with a READONLY error when a numbered match var is
2635 * set without a previous pattern match. Unless it's C<local $1>
2636 */
e91d8259 2637 croakparen:
2fdbfb4d 2638 if (!PL_localizing) {
cb077ed2 2639 Perl_croak_no_modify();
2fdbfb4d
AB		 2640 }
2641 }
e91d8259
NC		 2642 return 0;
2643 }
2644
2645 switch (*mg->mg_ptr) {
748a9306 2646 case '\001': /* ^A */
f2da823f
FC		 2647 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2648 else SvOK_off(PL_bodytarget);
64eff8b7
DM		 2649 FmLINES(PL_bodytarget) = 0;
2650 if (SvPOK(PL_bodytarget)) {
2651 char *s = SvPVX(PL_bodytarget);
2652 while ( ((s = strchr(s, '\n'))) ) {
2653 FmLINES(PL_bodytarget)++;
2654 s++;
2655 }
2656 }
125b9982 2657 /* mg_set() has temporarily made sv non-magical */
284167a5 2658 if (TAINTING_get) {
125b9982
NT		 2659 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2660 SvTAINTED_on(PL_bodytarget);
2661 else
2662 SvTAINTED_off(PL_bodytarget);
2663 }
748a9306 2664 break;
49460fe6 2665 case '\003': /* ^C */
f2338a2e 2666 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS		 2667 break;
2668
79072805 2669 case '\004': /* ^D */
b4ab917c 2670#ifdef DEBUGGING
a9e2d2bf
DM		 2671 {
2672 const char *s = SvPV_nolen_const(sv);
2673 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2674 if (DEBUG_x_TEST || DEBUG_B_TEST)
2675 dump_all_perl(!DEBUG_B_TEST);
2676 }
b4ab917c 2677#else
38ab35f8 2678 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2679#endif
79072805 2680 break;
28f23441 2681 case '\005': /* ^E */
d0063567 2682 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2683#ifdef VMS
38ab35f8 2684 set_vaxc_errno(SvIV(sv));
e37778c2
NC		 2685#else
2686# ifdef WIN32
d0063567 2687 SetLastError( SvIV(sv) );
e37778c2
NC		 2688# else
2689# ifdef OS2
38ab35f8 2690 os2_setsyserrno(SvIV(sv));
e37778c2 2691# else
d0063567 2692 /* will anyone ever use this? */
38ab35f8 2693 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ		 2694# endif
2695# endif
22fae026 2696#endif
d0063567 2697 }
3e669301 2698 else {
a15a3d9b 2699 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
d5b4785c
DIM		 2700 if (PL_localizing != 2) {
2701 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
a15a3d9b 2702 "${^ENCODING} is no longer supported");
d5b4785c 2703 }
3e669301 2704 }
d0063567 2705 break;
79072805 2706 case '\006': /* ^F */
38ab35f8 2707 PL_maxsysfd = SvIV(sv);
79072805 2708 break;
a0d0e21e 2709 case '\010': /* ^H */
38ab35f8 2710 PL_hints = SvIV(sv);
a0d0e21e 2711 break;
9d116dd7 2712 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2713 Safefree(PL_inplace);
bd61b366 2714 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2715 break;
d9bad346
FC		 2716 case '\016': /* ^N */
2717 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2718 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2719 goto croakparen;
28f23441 2720 case '\017': /* ^O */
ac27b0f5 2721 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2722 Safefree(PL_osname);
bd61b366 2723 PL_osname = NULL;
3511154c
DM		 2724 if (SvOK(sv)) {
2725 TAINT_PROPER("assigning to $^O");
2e0de35c 2726 PL_osname = savesvpv(sv);
3511154c 2727 }
ac27b0f5
NIS		 2728 }
2729 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC		 2730 STRLEN len;
2731 const char *const start = SvPV(sv, len);
b54fc2b6 2732 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2733 SV *tmp;
8b850bd5
NC		 2734
2735
2736 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2737 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC		 2738
2739 /* Opening for input is more common than opening for output, so
2740 ensure that hints for input are sooner on linked list. */
59cd0e26 2741 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z		 2742 SvUTF8(sv))
2743 : newSVpvs_flags("", SvUTF8(sv));
2744 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2745 mg_set(tmp);
8b850bd5 2746
f747ebd6
Z		 2747 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2748 SvUTF8(sv));
2749 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2750 mg_set(tmp);
ac27b0f5 2751 }
28f23441 2752 break;
79072805 2753 case '\020': /* ^P */
2fdbfb4d
AB		 2754 PL_perldb = SvIV(sv);
2755 if (PL_perldb && !PL_DBsingle)
2756 init_debugger();
9b9e0be4 2757 break;
79072805 2758 case '\024': /* ^T */
88e89b8a 2759#ifdef BIG_TIME
6b88bc9c 2760 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2761#else
38ab35f8 2762 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2763#endif
79072805 2764 break;
e07ea26a
NC		 2765 case '\025': /* ^UTF8CACHE */
2766 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2767 PL_utf8cache = (signed char) sv_2iv(sv);
2768 }
2769 break;
fde18df1 2770 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH		 2771 if (*(mg->mg_ptr+1) == '\0') {
2772 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2773 i = SvIV(sv);
ac27b0f5 2774 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2775 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2776 }
599cee73 2777 }
0a378802 2778 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2779 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC		 2780 if (!SvPOK(sv)) {
2781 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS		 2782 break;
2783 }
f4fc7782 2784 {
b5477537 2785 STRLEN len, i;
d3a7d8c7 2786 int accumulate = 0 ;
f4fc7782 2787 int any_fatals = 0 ;
b83604b4 2788 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH		 2789 for (i = 0 ; i < len ; ++i) {
2790 accumulate |= ptr[i] ;
2791 any_fatals |= (ptr[i] & 0xAA) ;
2792 }
4243c432
NC		 2793 if (!accumulate) {
2794 if (!specialWARN(PL_compiling.cop_warnings))
2795 PerlMemShared_free(PL_compiling.cop_warnings);
2796 PL_compiling.cop_warnings = pWARN_NONE;
2797 }
3c3f8cd6
AB		 2798 /* Yuck. I can't see how to abstract this: */
2799 else if (isWARN_on(
2800 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2801 WARN_ALL)
2802 && !any_fatals)
2803 {
2804 if (!specialWARN(PL_compiling.cop_warnings))
2805 PerlMemShared_free(PL_compiling.cop_warnings);
2806 PL_compiling.cop_warnings = pWARN_ALL;
2807 PL_dowarn |= G_WARN_ONCE ;
2808 }
d3a7d8c7 2809 else {
72dc9ed5
NC		 2810 STRLEN len;
2811 const char *const p = SvPV_const(sv, len);
2812
2813 PL_compiling.cop_warnings
8ee4cf24 2814 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC		 2815 p, len);
2816
d3a7d8c7
GS		 2817 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2818 PL_dowarn |= G_WARN_ONCE ;
2819 }
f4fc7782 2820
d3a7d8c7 2821 }
4438c4b7 2822 }
971a9dd3 2823 }
8ca2a5d6
DD		 2824#ifdef WIN32
2825 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2826 w32_sloppystat = (bool)sv_true(sv);
2827 }
2828#endif
79072805
LW		 2829 break;
2830 case '.':
3280af22
NIS		 2831 if (PL_localizing) {
2832 if (PL_localizing == 1)
7766f137 2833 SAVESPTR(PL_last_in_gv);
748a9306 2834 }
3280af22 2835 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2836 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW		 2837 break;
2838 case '^':
acbe1b9d 2839 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2840 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2841 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2842 break;
2843 case '~':
acbe1b9d 2844 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2845 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2846 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2847 break;
2848 case '=':
acbe1b9d 2849 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2850 break;
2851 case '-':
acbe1b9d
FC		 2852 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2853 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2854 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW		 2855 break;
2856 case '%':
acbe1b9d 2857 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2858 break;
2859 case '|':
4b65379b 2860 {
099be4f1 2861 IO * const io = GvIO(PL_defoutgv);
720f287d
AB		 2862 if(!io)
2863 break;
38ab35f8 2864 if ((SvIV(sv)) == 0)
4b65379b
CS		 2865 IoFLAGS(io) &= ~IOf_FLUSH;
2866 else {
2867 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2868 PerlIO *ofp = IoOFP(io);
2869 if (ofp)
2870 (void)PerlIO_flush(ofp);
2871 IoFLAGS(io) |= IOf_FLUSH;
2872 }
2873 }
79072805
LW		 2874 }
2875 break;
79072805 2876 case '/':
1ab48e3a
YO		 2877 {
2878 SV *tmpsv= sv;
2879 if (SvROK(sv)) {
2880 SV *referent= SvRV(sv);
2881 const char *reftype= sv_reftype(referent, 0);
2882 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2883 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2884 * a full string comparison on the return of sv_reftype() both of which
2885 * make me feel worse! NOTE, do not modify this comment without reviewing the
2886 * corresponding comment in sv_reftype(). - Yves */
2887 if (reftype[0] == 'S' || reftype[0] == 'L') {
2888 IV val= SvIV(referent);
2889 if (val <= 0) {
2890 tmpsv= &PL_sv_undef;
ddc3d23f 2891 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1ab48e3a
YO		 2892 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2893 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2894 );
2895 }
2896 } else {
ddce084a 2897 sv_setsv(sv, PL_rs);
ee0ba734 2898 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC		 2899 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2900 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO		 2901 }
2902 }
b3a2acfa 2903 SvREFCNT_dec(PL_rs);
1ab48e3a 2904 PL_rs = newSVsv(tmpsv);
b3a2acfa 2905 }
79072805
LW		 2906 break;
2907 case '\\':
ef8d46e8 2908 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2909 if (SvOK(sv)) {
7889fe52 2910 PL_ors_sv = newSVsv(sv);
009c130f 2911 }
e3c19b7b 2912 else {
a0714e2c 2913 PL_ors_sv = NULL;
e3c19b7b 2914 }
79072805 2915 break;
7d69d4a6
FC		 2916 case '[':
2917 if (SvIV(sv) != 0)
2918 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2919 break;
79072805 2920 case '?':
ff0cee69 2921#ifdef COMPLEX_STATUS
6b88bc9c 2922 if (PL_localizing == 2) {
41cb7b2b 2923 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 2924 PL_statusvalue = LvTARGOFF(sv);
2925 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69 2926 }
2927 else
2928#endif
2929#ifdef VMSISH_STATUS
2930 if (VMSISH_STATUS)
fb38d079 2931 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69 2932 else
2933#endif
38ab35f8 2934 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW		 2935 break;
2936 case '!':
93189314
JH		 2937 {
2938#ifdef VMS
2939# define PERL_VMS_BANG vaxc$errno
2940#else
2941# define PERL_VMS_BANG 0
2942#endif
27329181 2943#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH		 2944 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2945 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2946#else
91487cfc 2947 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2948 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2949#endif
93189314 2950 }
79072805
LW		 2951 break;
2952 case '<':
985213f2 2953 {
b469f1e0 2954 /* XXX $< currently silently ignores failures */
dfff4baf 2955 const Uid_t new_uid = SvUID(sv);
985213f2 2956 PL_delaymagic_uid = new_uid;
3280af22
NIS		 2957 if (PL_delaymagic) {
2958 PL_delaymagic |= DM_RUID;
79072805
LW		 2959 break; /* don't do magic till later */
2960 }
2961#ifdef HAS_SETRUID
b469f1e0 2962 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW		 2963#else
2964#ifdef HAS_SETREUID
b469f1e0 2965 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 2966#else
85e6fe83 2967#ifdef HAS_SETRESUID
b469f1e0 2968 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 2969#else
985213f2 2970 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2971#ifdef PERL_DARWIN
2972 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2973 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 2974 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 2975#endif
b469f1e0 2976 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 2977 } else {
cea2e8a9 2978 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2979 }
79072805
LW		 2980#endif
2981#endif
85e6fe83 2982#endif
79072805 2983 break;
985213f2 2984 }
79072805 2985 case '>':
985213f2 2986 {
b469f1e0 2987 /* XXX $> currently silently ignores failures */
dfff4baf 2988 const Uid_t new_euid = SvUID(sv);
985213f2 2989 PL_delaymagic_euid = new_euid;
3280af22
NIS		 2990 if (PL_delaymagic) {
2991 PL_delaymagic |= DM_EUID;
79072805
LW		 2992 break; /* don't do magic till later */
2993 }
2994#ifdef HAS_SETEUID
b469f1e0 2995 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW		 2996#else
2997#ifdef HAS_SETREUID
b469f1e0 2998 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW		 2999#else
3000#ifdef HAS_SETRESUID
b469f1e0 3001 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3002#else
985213f2 3003 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3004 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3005 else {
cea2e8a9 3006 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3007 }
79072805
LW		 3008#endif
3009#endif
85e6fe83 3010#endif
79072805 3011 break;
985213f2 3012 }
79072805 3013 case '(':
985213f2 3014 {
b469f1e0 3015 /* XXX $( currently silently ignores failures */
dfff4baf 3016 const Gid_t new_gid = SvGID(sv);
985213f2 3017 PL_delaymagic_gid = new_gid;
3280af22
NIS		 3018 if (PL_delaymagic) {
3019 PL_delaymagic |= DM_RGID;
79072805
LW		 3020 break; /* don't do magic till later */
3021 }
3022#ifdef HAS_SETRGID
b469f1e0 3023 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW		 3024#else
3025#ifdef HAS_SETREGID
b469f1e0 3026 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW		 3027#else
3028#ifdef HAS_SETRESGID
b469f1e0 3029 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3030#else
985213f2 3031 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3032 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3033 else {
cea2e8a9 3034 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3035 }
79072805
LW		 3036#endif
3037#endif
85e6fe83 3038#endif
79072805 3039 break;
985213f2 3040 }
79072805 3041 case ')':
985213f2 3042 {
0635704a
HS		 3043/* (hv) best guess: maybe we'll need configure probes to do a better job,
3044 * but you can override it if you need to.
3045 */
3046#ifndef INVALID_GID
3047#define INVALID_GID ((Gid_t)-1)
3048#endif
b469f1e0 3049 /* XXX $) currently silently ignores failures */
dfff4baf 3050 Gid_t new_egid;
5cd24f17 3051#ifdef HAS_SETGROUPS
3052 {
b83604b4 3053 const char *p = SvPV_const(sv, len);
757f63d8 3054 Groups_t *gary = NULL;
fdadaf77 3055 const char* endptr;
22ff3130 3056 UV uv;
fb4089e0 3057#ifdef _SC_NGROUPS_MAX
3058 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3059
3060 if (maxgrp < 0)
3061 maxgrp = NGROUPS;
3062#else
3063 int maxgrp = NGROUPS;
3064#endif
757f63d8
SP		 3065
3066 while (isSPACE(*p))
3067 ++p;
22ff3130
HS		 3068 if (grok_atoUV(p, &uv, &endptr))
3069 new_egid = (Gid_t)uv;
3070 else {
0635704a 3071 new_egid = INVALID_GID;
22ff3130
HS		 3072 endptr = NULL;
3073 }
fb4089e0 3074 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH		 3075 if (endptr == NULL)
3076 break;
3077 p = endptr;
757f63d8
SP		 3078 while (isSPACE(*p))
3079 ++p;
3080 if (!*p)
3081 break;
fdadaf77 3082 if (!gary)
757f63d8
SP		 3083 Newx(gary, i + 1, Groups_t);
3084 else
3085 Renew(gary, i + 1, Groups_t);
22ff3130
HS		 3086 if (grok_atoUV(p, &uv, &endptr))
3087 gary[i] = (Groups_t)uv;
3088 else {
0635704a 3089 gary[i] = INVALID_GID;
22ff3130
HS		 3090 endptr = NULL;
3091 }
757f63d8
SP		 3092 }
3093 if (i)
b469f1e0 3094 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3095 Safefree(gary);
5cd24f17 3096 }
3097#else /* HAS_SETGROUPS */
dfff4baf 3098 new_egid = SvGID(sv);
5cd24f17 3099#endif /* HAS_SETGROUPS */
985213f2 3100 PL_delaymagic_egid = new_egid;
3280af22
NIS		 3101 if (PL_delaymagic) {
3102 PL_delaymagic |= DM_EGID;
79072805
LW		 3103 break; /* don't do magic till later */
3104 }
3105#ifdef HAS_SETEGID
b469f1e0 3106 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW		 3107#else
3108#ifdef HAS_SETREGID
b469f1e0 3109 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW		 3110#else
3111#ifdef HAS_SETRESGID
b469f1e0 3112 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3113#else
985213f2 3114 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3115 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3116 else {
cea2e8a9 3117 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3118 }
79072805
LW		 3119#endif
3120#endif
85e6fe83 3121#endif
79072805 3122 break;
985213f2 3123 }
79072805 3124 case ':':
2d8e6c8d 3125 PL_chopset = SvPV_force(sv,len);
79072805 3126 break;
9cdac2a2
FC		 3127 case '$': /* $$ */
3128 /* Store the pid in mg->mg_obj so we can tell when a fork has
3129 occurred. mg->mg_obj points to *$ by default, so clear it. */
3130 if (isGV(mg->mg_obj)) {
3131 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3132 SvREFCNT_dec(mg->mg_obj);
3133 mg->mg_flags |= MGf_REFCOUNTED;
3134 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3135 }
3136 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3137 break;
79072805 3138 case '0':
e2975953 3139 LOCK_DOLLARZERO_MUTEX;
f1540bed 3140 S_set_dollarzero(aTHX_ sv);
e2975953 3141 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW		 3142 break;
3143 }
3144 return 0;
3145}
3146
3147I32
84c7b88c
BF		 3148Perl_whichsig_sv(pTHX_ SV *sigsv)
3149{
3150 const char *sigpv;
3151 STRLEN siglen;
3152 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF		 3153 sigpv = SvPV_const(sigsv, siglen);
3154 return whichsig_pvn(sigpv, siglen);
3155}
3156
3157I32
3158Perl_whichsig_pv(pTHX_ const char *sig)
3159{
3160 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF		 3161 return whichsig_pvn(sig, strlen(sig));
3162}
3163
3164I32
3165Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3166{
eb578fdb 3167 char* const* sigv;
7918f24d 3168
84c7b88c 3169 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3170 PERL_UNUSED_CONTEXT;
79072805 3171
aadb217d 3172 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3173 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3174 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3175#ifdef SIGCLD
84c7b88c 3176 if (memEQs(sig, len, "CHLD"))
79072805
LW		 3177 return SIGCLD;
3178#endif
3179#ifdef SIGCHLD
84c7b88c 3180 if (memEQs(sig, len, "CLD"))
79072805
LW		 3181 return SIGCHLD;
3182#endif
7f1236c0 3183 return -1;
79072805
LW		 3184}
3185
ecfc5424 3186Signal_t
1e82f5a6 3187#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3188Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH		 3189#else
3190Perl_sighandler(int sig)
3191#endif
79072805 3192{
1018e26f
NIS		 3193#ifdef PERL_GET_SIG_CONTEXT
3194 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3195#else
cea2e8a9 3196 dTHX;
71d280e3 3197#endif
79072805 3198 dSP;
a0714e2c
SS		 3199 GV *gv = NULL;
3200 SV *sv = NULL;
8772537c 3201 SV * const tSv = PL_Sv;
601f1833 3202 CV *cv = NULL;
533c011a 3203 OP *myop = PL_op;
84902520 3204 U32 flags = 0;
8772537c 3205 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3206 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3207 SV *errsv_save = NULL;
71d280e3 3208
84902520 3209
727405f8 3210 if (!PL_psig_ptr[sig]) {
99ef548b 3211 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS		 3212 PL_sig_name[sig]);
3213 exit(sig);
3214 }
ff0cee69 3215
a0d63a7b
DM		 3216 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3217 /* Max number of items pushed there is 3*n or 4. We cannot fix
3218 infinity, so we fix 4 (in fact 5): */
3219 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3220 flags |= 1;
3221 PL_savestack_ix += 5; /* Protect save in progress. */
3222 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3223 }
84902520 3224 }
84902520 3225 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3226 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL		 3227 || SvTYPE(cv) != SVt_PVCV) {
3228 HV *st;
f2c0649b 3229 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3230 }
84902520 3231
a0d0e21e 3232 if (!cv || !CvROOT(cv)) {
07c325bb 3233 const HEK * const hek = gv
1d6bb9ae
FC		 3234 ? GvENAME_HEK(gv)
3235 : cv && CvNAMED(cv)
3236 ? CvNAME_HEK(cv)
07c325bb
FC		 3237 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3238 if (hek)
3239 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3240 "SIG%s handler \"%"HEKf"\" not defined.\n",
ac892e4a 3241 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC		 3242 /* diag_listed_as: SIG%s handler "%s" not defined */
3243 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3244 "SIG%s handler \"__ANON__\" not defined.\n",
3245 PL_sig_name[sig]);
00d579c5 3246 goto cleanup;
79072805
LW		 3247 }
3248
0c4d3b5e
DM		 3249 sv = PL_psig_name[sig]
3250 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3251 : newSVpv(PL_sig_name[sig],0);
72048cfe 3252 flags |= 8;
0c4d3b5e
DM		 3253 SAVEFREESV(sv);
3254
a0d63a7b
DM		 3255 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3256 /* make sure our assumption about the size of the SAVEs are correct:
3257 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3258 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3259 }
e336de0d 3260
e788e7d3 3261 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3262 PUSHMARK(SP);
79072805 3263 PUSHs(sv);
8aad04aa
JH		 3264#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3265 {
3266 struct sigaction oact;
3267
3268 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH		 3269 if (sip) {
3270 HV *sih = newHV();
ad64d0ec 3271 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH		 3272 /* The siginfo fields signo, code, errno, pid, uid,
3273 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC		 3274 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3275 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM		 3276#ifdef HAS_SIGINFO_SI_ERRNO
3277 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3278#endif
3279#ifdef HAS_SIGINFO_SI_STATUS
3280 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3281#endif
3282#ifdef HAS_SIGINFO_SI_UID
3283 {
3284 SV *uid = newSV(0);
3285 sv_setuid(uid, sip->si_uid);
3286 (void)hv_stores(sih, "uid", uid);
3287 }
3288#endif
3289#ifdef HAS_SIGINFO_SI_PID
3290 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3291#endif
3292#ifdef HAS_SIGINFO_SI_ADDR
3293 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3294#endif
3295#ifdef HAS_SIGINFO_SI_BAND
3296 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3297#endif
8aad04aa 3298 EXTEND(SP, 2);
ad64d0ec 3299 PUSHs(rv);
22f1178f 3300 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3301 }
b4552a27 3302
8aad04aa
JH		 3303 }
3304 }
3305#endif
79072805 3306 PUTBACK;
a0d0e21e 3307
100c03aa
JL		 3308 errsv_save = newSVsv(ERRSV);
3309
ad64d0ec 3310 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3311
d3acc0f7 3312 POPSTACK;
eed484f9
DD		 3313 {
3314 SV * const errsv = ERRSV;
3315 if (SvTRUE_NN(errsv)) {
3316 SvREFCNT_dec(errsv_save);
c22d665b 3317#ifndef PERL_MICRO
1b266415
NIS		 3318 /* Handler "died", for example to get out of a restart-able read().
3319 * Before we re-do that on its behalf re-enable the signal which was
3320 * blocked by the system when we entered.
3321 */
c22d665b 3322#ifdef HAS_SIGPROCMASK
d488af49 3323#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3324 if (sip || uap)
c22d665b 3325#endif
eed484f9
DD		 3326 {
3327 sigset_t set;
3328 sigemptyset(&set);
3329 sigaddset(&set,sig);
3330 sigprocmask(SIG_UNBLOCK, &set, NULL);
3331 }
c22d665b 3332#else
eed484f9
DD		 3333 /* Not clear if this will work */
3334 (void)rsignal(sig, SIG_IGN);
3335 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT		 3336#endif
3337#endif /* !PERL_MICRO */
eed484f9
DD		 3338 die_sv(errsv);
3339 }
3340 else {
3341 sv_setsv(errsv, errsv_save);
3342 SvREFCNT_dec(errsv_save);
3343 }
100c03aa
JL		 3344 }
3345
7b52d656 3346 cleanup:
0c4d3b5e
DM		 3347 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3348 PL_savestack_ix = old_ss_ix;
72048cfe 3349 if (flags & 8)
2357bae7 3350 SvREFCNT_dec_NN(sv);
533c011a 3351 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3352
3280af22
NIS		 3353 PL_Sv = tSv; /* Restore global temporaries. */
3354 PL_Xpv = tXpv;
53bb94e2 3355 return;
79072805 3356}
4e35701f
NIS		 3357
3358
51371543 3359static void
8772537c 3360S_restore_magic(pTHX_ const void *p)
51371543 3361{
8772537c
AL		 3362 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3363 SV* const sv = mgs->mgs_sv;
150b625d 3364 bool bumped;
51371543
GS		 3365
3366 if (!sv)
3367 return;
3368
4bac9ae4
CS		 3369 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3370 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC		 3371 if (mgs->mgs_flags)
3372 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS		 3373 else
3374 mg_magical(sv);
51371543
GS		 3375 }
3376
150b625d 3377 bumped = mgs->mgs_bumped;
51371543
GS		 3378 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3379
3380 /* If we're still on top of the stack, pop us off. (That condition
3381 * will be satisfied if restore_magic was called explicitly, but *not*
3382 * if it's being called via leave_scope.)
3383 * The reason for doing this is that otherwise, things like sv_2cv()
3384 * may leave alloc gunk on the savestack, and some code
3385 * (e.g. sighandler) doesn't expect that...
3386 */
3387 if (PL_savestack_ix == mgs->mgs_ss_ix)
3388 {
1be36ce0
NC		 3389 UV popval = SSPOPUV;
3390 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3391 PL_savestack_ix -= 2;
1be36ce0
NC		 3392 popval = SSPOPUV;
3393 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3394 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3395 }
150b625d
DM		 3396 if (bumped) {
3397 if (SvREFCNT(sv) == 1) {
3398 /* We hold the last reference to this SV, which implies that the
3399 SV was deleted as a side effect of the routines we called.
3400 So artificially keep it alive a bit longer.
3401 We avoid turning on the TEMP flag, which can cause the SV's
3402 buffer to get stolen (and maybe other stuff). */
150b625d 3403 sv_2mortal(sv);
4bac9ae4 3404 SvTEMP_off(sv);
8985fe98 3405 }
150b625d 3406 else
2357bae7 3407 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3408 }
51371543
GS		 3409}
3410
0c4d3b5e
DM		 3411/* clean up the mess created by Perl_sighandler().
3412 * Note that this is only called during an exit in a signal handler;
3413 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3414 * skipped over. */
0c4d3b5e 3415
51371543 3416static void
8772537c 3417S_unwind_handler_stack(pTHX_ const void *p)
51371543 3418{
0c4d3b5e 3419 PERL_UNUSED_ARG(p);
7918f24d 3420
0c4d3b5e 3421 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3422}
1018e26f 3423
66610fdd 3424/*
b3ca2e83
NC		 3425=for apidoc magic_sethint
3426
796b6530 3427Triggered by a store to C<%^H>, records the key/value pair to
c28fe1ec
NC		 3428C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3429anything that would need a deep copy. Maybe we should warn if we find a
3430reference.
b3ca2e83
NC		 3431
3432=cut
3433*/
3434int
3435Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3436{
ad64d0ec 3437 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3438 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3439
7918f24d
NC		 3440 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3441
e6e3e454
NC		 3442 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3443 an alternative leaf in there, with PL_compiling.cop_hints being used if
3444 it's NULL. If needed for threads, the alternative could lock a mutex,
3445 or take other more complex action. */
3446
5b9c0671
NC		 3447 /* Something changed in %^H, so it will need to be restored on scope exit.
3448 Doing this here saves a lot of doing it manually in perl code (and
3449 forgetting to do it, and consequent subtle errors. */
3450 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z		 3451 CopHINTHASH_set(&PL_compiling,
3452 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC		 3453 return 0;
3454}
3455
3456/*
f175cff5 3457=for apidoc magic_clearhint
b3ca2e83 3458
796b6530 3459Triggered by a delete from C<%^H>, records the key to
c28fe1ec 3460C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC		 3461
3462=cut
3463*/
3464int
3465Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3466{
7918f24d 3467 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL		 3468 PERL_UNUSED_ARG(sv);
3469
5b9c0671 3470 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3471 CopHINTHASH_set(&PL_compiling,
e3352591
FC		 3472 mg->mg_len == HEf_SVKEY
3473 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3474 MUTABLE_SV(mg->mg_ptr), 0, 0)
3475 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3476 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC		 3477 return 0;
3478}
3479
3480/*
f747ebd6
Z		 3481=for apidoc magic_clearhints
3482
796b6530 3483Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
f747ebd6
Z		 3484
3485=cut
3486*/
3487int
3488Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3489{
3490 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3491 PERL_UNUSED_ARG(sv);
3492 PERL_UNUSED_ARG(mg);
20439bc7
Z		 3493 cophh_free(CopHINTHASH_get(&PL_compiling));
3494 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z		 3495 return 0;
3496}
3497
09fb282d
FC		 3498int
3499Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3500 const char *name, I32 namlen)
3501{
3502 MAGIC *nmg;
3503
3504 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3505 PERL_UNUSED_ARG(sv);
09fb282d
FC		 3506 PERL_UNUSED_ARG(name);
3507 PERL_UNUSED_ARG(namlen);
3508
3509 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3510 nmg = mg_find(nsv, mg->mg_type);
316ebaf2 3511 assert(nmg);
09fb282d
FC		 3512 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3513 nmg->mg_ptr = mg->mg_ptr;
3514 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3515 nmg->mg_flags |= MGf_REFCOUNTED;
3516 return 1;
3517}
3518
a6d69523
TC		 3519int
3520Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3521 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3522
23270f96
DM		 3523#if DBVARMG_SINGLE != 0
3524 assert(mg->mg_private >= DBVARMG_SINGLE);
3525#endif
3526 assert(mg->mg_private < DBVARMG_COUNT);
a6d69523
TC		 3527
3528 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3529
3530 return 1;
3531}
3532
3533int
3534Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3535 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3536
23270f96
DM		 3537#if DBVARMG_SINGLE != 0
3538 assert(mg->mg_private >= DBVARMG_SINGLE);
3539#endif
3540 assert(mg->mg_private < DBVARMG_COUNT);
a6d69523
TC		 3541 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3542
3543 return 0;
3544}
3545
f747ebd6 3546/*
14d04a33 3547 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3548 */
Unnamed repository; edit this file 'description' to name the repository.