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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20"Magic" is special data attached to SV structures in order to give them
21"magical" properties. When any Perl code tries to read from, or assign to,
22an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 23with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 24give it a chance to update its internal value (get on $. writes the line
b53c43bf 25number of the last read filehandle into the SV's IV slot), while
166f8a29 26set is called after an SV has been written to, in order to allow it to make
ddfa107c 27use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
28PL_rs global variable).
29
30Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 31SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 32of functions that implement the get(), set(), length() etc functions,
154e47c8 33plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
34a MAGIC structure that contains a pointer to the object associated with the
35tie.
36
7fefc6c1
KW
37=cut
38
ccfc67b7
JH
39*/
40
79072805 41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_MG_C
79072805
LW
43#include "perl.h"
44
5cd24f17 45#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
46# ifdef I_GRP
47# include <grp.h>
48# endif
188ea221
CS
49#endif
50
757f63d8
SP
51#if defined(HAS_SETGROUPS)
52# ifndef NGROUPS
53# define NGROUPS 32
54# endif
55#endif
56
17aa7f3d
JH
57#ifdef __hpux
58# include <sys/pstat.h>
59#endif
60
7636ea95
AB
61#ifdef HAS_PRCTL_SET_NAME
62# include <sys/prctl.h>
63#endif
64
8aad04aa 65#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 66Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 67#else
e69880a5 68Signal_t Perl_csighandler(int sig);
8aad04aa 69#endif
e69880a5 70
9cffb111
OS
71#ifdef __Lynx__
72/* Missing protos on LynxOS */
73void setruid(uid_t id);
74void seteuid(uid_t id);
75void setrgid(uid_t id);
76void setegid(uid_t id);
77#endif
78
c07a80fd 79/*
4bac9ae4 80 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
82 */
83
84struct magic_state {
85 SV* mgs_sv;
455ece5e 86 I32 mgs_ss_ix;
a623f893 87 U32 mgs_flags;
150b625d 88 bool mgs_bumped;
c07a80fd 89};
455ece5e 90/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
91
92STATIC void
ff44333e 93S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
c07a80fd 94{
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d 97
ff44333e 98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 99
4bac9ae4
CS
100 assert(SvMAGICAL(sv));
101
150b625d
DM
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
110 bumped = TRUE;
111 }
8985fe98 112
8772537c 113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
114
115 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 116 mgs->mgs_sv = sv;
a623f893 117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 119 mgs->mgs_bumped = bumped;
c07a80fd 120
ff44333e 121 SvFLAGS(sv) &= ~flags;
3805b5fb 122 SvREADONLY_off(sv);
c07a80fd
PP
123}
124
ff44333e
FC
125#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
126
954c1994
GS
127/*
128=for apidoc mg_magical
129
fbe13c60 130Turns on the magical status of an SV. See C<L</sv_magic>>.
954c1994
GS
131
132=cut
133*/
134
8990e307 135void
ddeaf645 136Perl_mg_magical(SV *sv)
8990e307 137{
e1ec3a88 138 const MAGIC* mg;
7918f24d 139 PERL_ARGS_ASSERT_MG_MAGICAL;
f9c6fee5
CS
140
141 SvMAGICAL_off(sv);
218787bd 142 if ((mg = SvMAGIC(sv))) {
218787bd
VP
143 do {
144 const MGVTBL* const vtbl = mg->mg_virtual;
145 if (vtbl) {
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 SvGMAGICAL_on(sv);
148 if (vtbl->svt_set)
149 SvSMAGICAL_on(sv);
150 if (vtbl->svt_clear)
151 SvRMAGICAL_on(sv);
152 }
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
155 SvRMAGICAL_on(sv);
8990e307
LW
156 }
157}
158
954c1994
GS
159/*
160=for apidoc mg_get
161
4b1e7f06 162Do magic before a value is retrieved from the SV. The type of SV must
796b6530 163be >= C<SVt_PVMG>. See C<L</sv_magic>>.
954c1994
GS
164
165=cut
166*/
167
79072805 168int
864dbfa3 169Perl_mg_get(pTHX_ SV *sv)
79072805 170{
35a4481c 171 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 172 bool saved = FALSE;
f9c6fee5 173 bool have_new = 0;
ff76feab 174 MAGIC *newmg, *head, *cur, *mg;
6683b158 175
7918f24d
NC
176 PERL_ARGS_ASSERT_MG_GET;
177
407287f9
FC
178 if (PL_localizing == 1 && sv == DEFSV) return 0;
179
ff76feab
AMS
180 /* We must call svt_get(sv, mg) for each valid entry in the linked
181 list of magic. svt_get() may delete the current entry, add new
182 magic to the head of the list, or upgrade the SV. AMS 20010810 */
183
184 newmg = cur = head = mg = SvMAGIC(sv);
185 while (mg) {
35a4481c 186 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 187 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 188
2b260de0 189 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
190
191 /* taint's mg get is so dumb it doesn't need flag saving */
192 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
194 saved = TRUE;
195 }
196
16c91539 197 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 198
58f82c5c
DM
199 /* guard against magic having been deleted - eg FETCH calling
200 * untie */
f9c6fee5 201 if (!SvMAGIC(sv)) {
a623f893
FC
202 /* recalculate flags */
203 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 204 break;
f9c6fee5 205 }
b77f7d40 206
f9c6fee5 207 /* recalculate flags if this entry was deleted. */
ff76feab 208 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
209 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
210 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 211 }
7d1328bb
FC
212 else if (vtbl == &PL_vtbl_utf8) {
213 /* get-magic can reallocate the PV */
214 magic_setutf8(sv, mg);
215 }
ff76feab 216
f9c6fee5 217 mg = nextmg;
ff76feab 218
0723351e 219 if (have_new) {
ff76feab
AMS
220 /* Have we finished with the new entries we saw? Start again
221 where we left off (unless there are more new entries). */
222 if (mg == head) {
0723351e 223 have_new = 0;
ff76feab
AMS
224 mg = cur;
225 head = newmg;
226 }
227 }
228
229 /* Were any new entries added? */
0723351e
NC
230 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
231 have_new = 1;
ff76feab
AMS
232 cur = mg;
233 mg = newmg;
a623f893
FC
234 /* recalculate flags */
235 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 236 }
79072805 237 }
463ee0b2 238
a9844598
CS
239 if (saved)
240 restore_magic(INT2PTR(void *, (IV)mgs_ix));
241
79072805
LW
242 return 0;
243}
244
954c1994
GS
245/*
246=for apidoc mg_set
247
fbe13c60 248Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
249
250=cut
251*/
252
79072805 253int
864dbfa3 254Perl_mg_set(pTHX_ SV *sv)
79072805 255{
35a4481c 256 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 257 MAGIC* mg;
463ee0b2
LW
258 MAGIC* nextmg;
259
7918f24d
NC
260 PERL_ARGS_ASSERT_MG_SET;
261
b5ed8c44
FC
262 if (PL_localizing == 2 && sv == DEFSV) return 0;
263
ff44333e 264 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
265
266 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 267 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 268 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
269 if (mg->mg_flags & MGf_GSKIP) {
270 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 271 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 272 }
e0a73de4 273 if (PL_localizing == 2
b5ed8c44 274 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 275 continue;
2b260de0 276 if (vtbl && vtbl->svt_set)
16c91539 277 vtbl->svt_set(aTHX_ sv, mg);
79072805 278 }
463ee0b2 279
8772537c 280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
281 return 0;
282}
283
954c1994
GS
284/*
285=for apidoc mg_length
286
d4e99c76 287Reports on the SV's length in bytes, calling length magic if available,
796b6530 288but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 289magic if there is no 'length' magic, but with no indication as to
796b6530
KW
290whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
291higher. Use C<sv_len()> instead.
954c1994
GS
292
293=cut
294*/
295
79072805 296U32
864dbfa3 297Perl_mg_length(pTHX_ SV *sv)
79072805
LW
298{
299 MAGIC* mg;
463ee0b2 300 STRLEN len;
463ee0b2 301
7918f24d
NC
302 PERL_ARGS_ASSERT_MG_LENGTH;
303
79072805 304 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 305 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 306 if (vtbl && vtbl->svt_len) {
35a4481c 307 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 308 save_magic(mgs_ix, sv);
a0d0e21e 309 /* omit MGf_GSKIP -- not changed here */
16c91539 310 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 311 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
312 return len;
313 }
314 }
315
bd8446cf 316 (void)SvPV_const(sv, len);
463ee0b2 317 return len;
79072805
LW
318}
319
8fb26106 320I32
864dbfa3 321Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
322{
323 MAGIC* mg;
ac27b0f5 324
7918f24d
NC
325 PERL_ARGS_ASSERT_MG_SIZE;
326
93965878 327 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 328 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 329 if (vtbl && vtbl->svt_len) {
35a4481c
AL
330 const I32 mgs_ix = SSNEW(sizeof(MGS));
331 I32 len;
455ece5e 332 save_magic(mgs_ix, sv);
93965878 333 /* omit MGf_GSKIP -- not changed here */
16c91539 334 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 335 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
336 return len;
337 }
338 }
339
340 switch(SvTYPE(sv)) {
341 case SVt_PVAV:
502c6561 342 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
343 case SVt_PVHV:
344 /* FIXME */
345 default:
cea2e8a9 346 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 347
93965878 348 }
a25b5927 349 NOT_REACHED; /* NOTREACHED */
93965878
NIS
350}
351
954c1994
GS
352/*
353=for apidoc mg_clear
354
fbe13c60 355Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
356
357=cut
358*/
359
79072805 360int
864dbfa3 361Perl_mg_clear(pTHX_ SV *sv)
79072805 362{
35a4481c 363 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 364 MAGIC* mg;
8ac77ac9 365 MAGIC *nextmg;
463ee0b2 366
7918f24d
NC
367 PERL_ARGS_ASSERT_MG_CLEAR;
368
455ece5e 369 save_magic(mgs_ix, sv);
463ee0b2 370
8ac77ac9 371 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 372 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 373 /* omit GSKIP -- never set here */
727405f8 374
8ac77ac9
NC
375 nextmg = mg->mg_moremagic; /* it may delete itself */
376
2b260de0 377 if (vtbl && vtbl->svt_clear)
16c91539 378 vtbl->svt_clear(aTHX_ sv, mg);
79072805 379 }
463ee0b2 380
8772537c 381 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
382 return 0;
383}
384
ed624ca8 385static MAGIC*
ddeaf645 386S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 387{
39de7f53
FR
388 assert(flags <= 1);
389
390 if (sv) {
391 MAGIC *mg;
392
393 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
394 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
395 return mg;
396 }
397 }
398 }
399
400 return NULL;
401}
402
954c1994
GS
403/*
404=for apidoc mg_find
405
796b6530 406Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
407
408=cut
409*/
410
93a17b20 411MAGIC*
ddeaf645 412Perl_mg_find(const SV *sv, int type)
93a17b20 413{
ddeaf645 414 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
415}
416
417/*
418=for apidoc mg_findext
419
420Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 421C<L</sv_magicext>>.
39de7f53
FR
422
423=cut
424*/
425
426MAGIC*
ddeaf645 427Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 428{
ddeaf645 429 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
430}
431
96c2a8ff
FC
432MAGIC *
433Perl_mg_find_mglob(pTHX_ SV *sv)
434{
435 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
436 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
437 /* This sv is only a delegate. //g magic must be attached to
438 its target. */
439 vivify_defelem(sv);
440 sv = LvTARG(sv);
441 }
442 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 443 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
444 return NULL;
445}
446
954c1994
GS
447/*
448=for apidoc mg_copy
449
fbe13c60 450Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
451
452=cut
453*/
454
79072805 455int
864dbfa3 456Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 457{
463ee0b2 458 int count = 0;
79072805 459 MAGIC* mg;
7918f24d
NC
460
461 PERL_ARGS_ASSERT_MG_COPY;
462
463ee0b2 463 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 464 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 465 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 466 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 467 }
823a54a3
AL
468 else {
469 const char type = mg->mg_type;
1e73acc8 470 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
471 sv_magic(nsv,
472 (type == PERL_MAGIC_tied)
473 ? SvTIED_obj(sv, mg)
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
SM
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
PP
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
PP
1184 int i = 0, j = 0;
1185
6fca0082 1186 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1187 elt = eltbuf;
1e422769
PP
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
PP
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
LW
1210
1211 while (s < strend) {
96827780 1212 char tmpbuf[256];
c623ac67 1213 Stat_t st;
5f74f29c 1214 I32 i;
83269ced
CB
1215#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1216 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1217#else
1218 const char path_sep = ':';
1219#endif
ba0a4150 1220 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1221 s, strend, path_sep, &i);
463ee0b2 1222 s++;
bb7a0f54 1223 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1224#ifdef __VMS
1225 /* no colon thus no device name -- assume relative path */
1226 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1227 /* Using Unix separator, e.g. under bash, so act line Unix */
1228 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1229#else
1230 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1231#endif
c6ed36e1 1232 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1233 MgTAINTEDDIR_on(mg);
1e422769
PP
1234 return 0;
1235 }
463ee0b2 1236 }
79072805
LW
1237 }
1238 }
28542d8f 1239#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1240
79072805
LW
1241 return 0;
1242}
1243
1244int
864dbfa3 1245Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1246{
7918f24d 1247 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1248 PERL_UNUSED_ARG(sv);
bd61b366 1249 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1250 return 0;
1251}
1252
88e89b8a 1253int
864dbfa3 1254Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1255{
7918f24d 1256 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1257 PERL_UNUSED_ARG(mg);
b0269e46 1258#if defined(VMS)
cea2e8a9 1259 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1260#else
3280af22 1261 if (PL_localizing) {
fb73857a 1262 HE* entry;
b0269e46 1263 my_clearenv();
85fbaab2
NC
1264 hv_iterinit(MUTABLE_HV(sv));
1265 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1266 I32 keylen;
1267 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1268 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1269 }
1270 }
1271#endif
1272 return 0;
1273}
1274
1275int
864dbfa3 1276Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1277{
7918f24d 1278 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1279 PERL_UNUSED_ARG(sv);
1280 PERL_UNUSED_ARG(mg);
b0269e46
AB
1281#if defined(VMS)
1282 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1283#else
1284 my_clearenv();
1285#endif
3e3baf6d 1286 return 0;
66b1d557
HM
1287}
1288
64ca3a65 1289#ifndef PERL_MICRO
2d4fcd5e
AJ
1290#ifdef HAS_SIGPROCMASK
1291static void
1292restore_sigmask(pTHX_ SV *save_sv)
1293{
0bd48802 1294 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1295 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1296}
1297#endif
66b1d557 1298int
864dbfa3 1299Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1300{
88e89b8a 1301 /* Are we fetching a signal entry? */
708854f2 1302 int i = (I16)mg->mg_private;
7918f24d
NC
1303
1304 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1305
708854f2 1306 if (!i) {
84c7b88c
BF
1307 STRLEN siglen;
1308 const char * sig = MgPV_const(mg, siglen);
1309 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1310 }
1311
e02bfb16 1312 if (i > 0) {
22c35a8c
GS
1313 if(PL_psig_ptr[i])
1314 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1315 else {
46da273f 1316 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1317#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1318 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1319 sigstate = SIG_IGN;
2e34cc90
CL
1320#endif
1321#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1322 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1323 sigstate = SIG_DFL;
85b332e2 1324#endif
88e89b8a 1325 /* cache state so we don't fetch it again */
8aad04aa 1326 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1327 sv_setpvs(sv,"IGNORE");
88e89b8a 1328 else
3280af22 1329 sv_setsv(sv,&PL_sv_undef);
46da273f 1330 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1331 SvTEMP_off(sv);
1332 }
1333 }
1334 return 0;
1335}
1336int
864dbfa3 1337Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1338{
7918f24d 1339 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1340
38a124f0 1341 magic_setsig(NULL, mg);
179c85a2 1342 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1343}
3d37d572 1344
0a8e0eff 1345Signal_t
8aad04aa 1346#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1347Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1348#else
0a8e0eff 1349Perl_csighandler(int sig)
8aad04aa 1350#endif
0a8e0eff 1351{
1018e26f
NIS
1352#ifdef PERL_GET_SIG_CONTEXT
1353 dTHXa(PERL_GET_SIG_CONTEXT);
1354#else
85b332e2
CL
1355 dTHX;
1356#endif
1271a1be 1357#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1358#if defined(__cplusplus) && defined(__GNUC__)
1359 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1360 * parameters would be warned about. */
1361 PERL_UNUSED_ARG(sip);
1362 PERL_UNUSED_ARG(uap);
1363#endif
1271a1be 1364#endif
23ada85b 1365#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1366 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1367 if (PL_sig_ignoring[sig]) return;
85b332e2 1368#endif
2e34cc90 1369#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1370 if (PL_sig_defaulting[sig])
2e34cc90
CL
1371#ifdef KILL_BY_SIGPRC
1372 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1373#else
1374 exit(1);
1375#endif
1376#endif
406878dd 1377 if (
853d2c32
RGS
1378#ifdef SIGILL
1379 sig == SIGILL ||
1380#endif
1381#ifdef SIGBUS
1382 sig == SIGBUS ||
1383#endif
1384#ifdef SIGSEGV
1385 sig == SIGSEGV ||
1386#endif
1387 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1388 /* Call the perl level handler now--
31c91b43 1389 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1390#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1391 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1392#else
1393 (*PL_sighandlerp)(sig);
92807b6d 1394#endif
406878dd 1395 else {
31c91b43 1396 if (!PL_psig_pend) return;
406878dd
GA
1397 /* Set a flag to say this signal is pending, that is awaiting delivery after
1398 * the current Perl opcode completes */
1399 PL_psig_pend[sig]++;
1400
1401#ifndef SIG_PENDING_DIE_COUNT
1402# define SIG_PENDING_DIE_COUNT 120
1403#endif
fe13d51d 1404 /* Add one to say _a_ signal is pending */
406878dd
GA
1405 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1406 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1407 (unsigned long)SIG_PENDING_DIE_COUNT);
1408 }
0a8e0eff
NIS
1409}
1410
2e34cc90
CL
1411#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1412void
1413Perl_csighandler_init(void)
1414{
1415 int sig;
27da23d5 1416 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1417
1418 for (sig = 1; sig < SIG_SIZE; sig++) {
1419#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1420 dTHX;
27da23d5 1421 PL_sig_defaulting[sig] = 1;
5c1546dc 1422 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1423#endif
1424#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1425 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1426#endif
1427 }
27da23d5 1428 PL_sig_handlers_initted = 1;
2e34cc90
CL
1429}
1430#endif
1431
7fe50b8b
LT
1432#if defined HAS_SIGPROCMASK
1433static void
1434unblock_sigmask(pTHX_ void* newset)
1435{
dc3bf405 1436 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1437 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1438}
1439#endif
1440
0a8e0eff
NIS
1441void
1442Perl_despatch_signals(pTHX)
1443{
1444 int sig;
1445 PL_sig_pending = 0;
1446 for (sig = 1; sig < SIG_SIZE; sig++) {
1447 if (PL_psig_pend[sig]) {
d0166017 1448 dSAVE_ERRNO;
7fe50b8b 1449#ifdef HAS_SIGPROCMASK
55534442
LT
1450 /* From sigaction(2) (FreeBSD man page):
1451 * | Signal routines normally execute with the signal that
1452 * | caused their invocation blocked, but other signals may
1453 * | yet occur.
1454 * Emulation of this behavior (from within Perl) is enabled
1455 * using sigprocmask
1456 */
1457 int was_blocked;
1458 sigset_t newset, oldset;
1459
1460 sigemptyset(&newset);
1461 sigaddset(&newset, sig);
1462 sigprocmask(SIG_BLOCK, &newset, &oldset);
1463 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1464 if (!was_blocked) {
1465 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1466 ENTER;
1467 SAVEFREESV(save_sv);
1468 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1469 }
55534442 1470#endif
25da4428 1471 PL_psig_pend[sig] = 0;
6e324d09 1472#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1473 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1474#else
1475 (*PL_sighandlerp)(sig);
92807b6d 1476#endif
7fe50b8b 1477#ifdef HAS_SIGPROCMASK
55534442 1478 if (!was_blocked)
7fe50b8b 1479 LEAVE;
55534442 1480#endif
d0166017 1481 RESTORE_ERRNO;
0a8e0eff
NIS
1482 }
1483 }
1484}
1485
38a124f0 1486/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1487int
864dbfa3 1488Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1489{
27da23d5 1490 dVAR;
79072805 1491 I32 i;
cbbf8932 1492 SV** svp = NULL;
2d4fcd5e
AJ
1493 /* Need to be careful with SvREFCNT_dec(), because that can have side
1494 * effects (due to closures). We must make sure that the new disposition
1495 * is in place before it is called.
1496 */
cbbf8932 1497 SV* to_dec = NULL;
e72dc28c 1498 STRLEN len;
2d4fcd5e
AJ
1499#ifdef HAS_SIGPROCMASK
1500 sigset_t set, save;
1501 SV* save_sv;
1502#endif
eb578fdb 1503 const char *s = MgPV_const(mg,len);
7918f24d
NC
1504
1505 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1506
748a9306 1507 if (*s == '_') {
84c7b88c 1508 if (memEQs(s, len, "__DIE__"))
3280af22 1509 svp = &PL_diehook;
84c7b88c 1510 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1511 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1512 /* Merge the existing behaviours, which are as follows:
1513 magic_setsig, we always set svp to &PL_warnhook
1514 (hence we always change the warnings handler)
1515 For magic_clearsig, we don't change the warnings handler if it's
1516 set to the &PL_warnhook. */
3280af22 1517 svp = &PL_warnhook;
84c7b88c
BF
1518 } else if (sv) {
1519 SV *tmp = sv_newmortal();
1520 Perl_croak(aTHX_ "No such hook: %s",
1521 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1522 }
748a9306 1523 i = 0;
38a124f0 1524 if (svp && *svp) {
9289f461
RGS
1525 if (*svp != PERL_WARNHOOK_FATAL)
1526 to_dec = *svp;
cbbf8932 1527 *svp = NULL;
4633a7c4 1528 }
748a9306
LW
1529 }
1530 else {
708854f2
NC
1531 i = (I16)mg->mg_private;
1532 if (!i) {
84c7b88c 1533 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1534 mg->mg_private = (U16)i;
708854f2 1535 }
86d86cad 1536 if (i <= 0) {
84c7b88c
BF
1537 if (sv) {
1538 SV *tmp = sv_newmortal();
1539 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1540 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1541 }
748a9306
LW
1542 return 0;
1543 }
2d4fcd5e
AJ
1544#ifdef HAS_SIGPROCMASK
1545 /* Avoid having the signal arrive at a bad time, if possible. */
1546 sigemptyset(&set);
1547 sigaddset(&set,i);
1548 sigprocmask(SIG_BLOCK, &set, &save);
1549 ENTER;
9ff8e806 1550 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1551 SAVEFREESV(save_sv);
1552 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1553#endif
1554 PERL_ASYNC_CHECK();
2e34cc90 1555#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1556 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1557#endif
23ada85b 1558#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1559 PL_sig_ignoring[i] = 0;
85b332e2 1560#endif
2e34cc90 1561#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1562 PL_sig_defaulting[i] = 0;
2e34cc90 1563#endif
2d4fcd5e 1564 to_dec = PL_psig_ptr[i];
38a124f0
NC
1565 if (sv) {
1566 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1567 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1568
1569 /* Signals don't change name during the program's execution, so once
1570 they're cached in the appropriate slot of PL_psig_name, they can
1571 stay there.
1572
1573 Ideally we'd find some way of making SVs at (C) compile time, or
1574 at least, doing most of the work. */
1575 if (!PL_psig_name[i]) {
1576 PL_psig_name[i] = newSVpvn(s, len);
1577 SvREADONLY_on(PL_psig_name[i]);
1578 }
38a124f0 1579 } else {
79fd3822 1580 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1581 PL_psig_name[i] = NULL;
1582 PL_psig_ptr[i] = NULL;
1583 }
748a9306 1584 }
38a124f0 1585 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1586 if (i) {
5c1546dc 1587 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1588 }
748a9306 1589 else
b37c2d43 1590 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1591 } else {
9dfa190b
NC
1592 if (sv && SvOK(sv)) {
1593 s = SvPV_force(sv, len);
1594 } else {
1595 sv = NULL;
1596 }
84c7b88c 1597 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1598 if (i) {
23ada85b 1599#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1600 PL_sig_ignoring[i] = 1;
1601 (void)rsignal(i, PL_csighandlerp);
85b332e2 1602#else
9dfa190b 1603 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1604#endif
9dfa190b 1605 }
2d4fcd5e 1606 }
84c7b88c 1607 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1608 if (i) {
2e34cc90 1609#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1610 PL_sig_defaulting[i] = 1;
1611 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1612#else
9dfa190b 1613 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1614#endif
9dfa190b
NC
1615 }
1616 }
1617 else {
1618 /*
1619 * We should warn if HINT_STRICT_REFS, but without
1620 * access to a known hint bit in a known OP, we can't
1621 * tell whether HINT_STRICT_REFS is in force or not.
1622 */
1623 if (!strchr(s,':') && !strchr(s,'\''))
1624 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1625 SV_GMAGIC);
1626 if (i)
1627 (void)rsignal(i, PL_csighandlerp);
1628 else
1629 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1630 }
748a9306 1631 }
9dfa190b 1632
2d4fcd5e
AJ
1633#ifdef HAS_SIGPROCMASK
1634 if(i)
1635 LEAVE;
1636#endif
ef8d46e8 1637 SvREFCNT_dec(to_dec);
79072805
LW
1638 return 0;
1639}
64ca3a65 1640#endif /* !PERL_MICRO */
79072805
LW
1641
1642int
864dbfa3 1643Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1644{
7918f24d 1645 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1646 PERL_UNUSED_ARG(sv);
e1a479c5 1647
89c14e2e 1648 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1649 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1650 return 0;
1651
0e446081 1652 return magic_clearisa(NULL, mg);
463ee0b2
LW
1653}
1654
0e446081 1655/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1656int
52b45067
RD
1657Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1658{
52b45067 1659 HV* stash;
7918f24d
NC
1660 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1661
52b45067 1662 /* Bail out if destruction is going on */
627364f1 1663 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1664
0e446081
NC
1665 if (sv)
1666 av_clear(MUTABLE_AV(sv));
52b45067 1667
6624142a
FC
1668 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1669 /* This occurs with setisa_elem magic, which calls this
1670 same function. */
1671 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1672
316ebaf2 1673 assert(mg);
6624142a
FC
1674 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1675 SV **svp = AvARRAY((AV *)mg->mg_obj);
1676 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1677 while (items--) {
1678 stash = GvSTASH((GV *)*svp++);
1679 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1680 }
1681
1682 return 0;
1683 }
1684
52b45067 1685 stash = GvSTASH(
6624142a 1686 (const GV *)mg->mg_obj
52b45067
RD
1687 );
1688
00169e2c
FC
1689 /* The stash may have been detached from the symbol table, so check its
1690 name before doing anything. */
1691 if (stash && HvENAME_get(stash))
5562fa71 1692 mro_isa_changed_in(stash);
52b45067
RD
1693
1694 return 0;
1695}
1696
1697int
864dbfa3 1698Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1699{
85fbaab2 1700 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1701 I32 i = 0;
7918f24d
NC
1702
1703 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1704 PERL_UNUSED_ARG(mg);
7719e241 1705
6ff81951 1706 if (hv) {
497b47a8 1707 (void) hv_iterinit(hv);
ad64d0ec 1708 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1709 i = HvUSEDKEYS(hv);
497b47a8
JH
1710 else {
1711 while (hv_iternext(hv))
1712 i++;
1713 }
6ff81951
GS
1714 }
1715
1716 sv_setiv(sv, (IV)i);
1717 return 0;
1718}
1719
1720int
864dbfa3 1721Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1722{
7918f24d 1723 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1724 PERL_UNUSED_ARG(mg);
946ec16e 1725 if (LvTARG(sv)) {
85fbaab2 1726 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1727 }
1728 return 0;
ac27b0f5 1729}
946ec16e 1730
efaf3674
DM
1731/*
1732=for apidoc magic_methcall
1733
1734Invoke a magic method (like FETCH).
1735
2baee27b
FC
1736C<sv> and C<mg> are the tied thingy and the tie magic.
1737
1738C<meth> is the name of the method to call.
1739
1740C<argc> is the number of args (in addition to $self) to pass to the method.
1741
1742The C<flags> can be:
1743
1744 G_DISCARD invoke method with G_DISCARD flag and don't
1745 return a value
1746 G_UNDEF_FILL fill the stack with argc pointers to
1747 PL_sv_undef
1748
1749The arguments themselves are any values following the C<flags> argument.
efaf3674 1750
796b6530 1751Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1752
1753
1754=cut
1755*/
1756
1757SV*
36925d9e 1758Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1759 U32 argc, ...)
a0d0e21e
LW
1760{
1761 dSP;
efaf3674 1762 SV* ret = NULL;
463ee0b2 1763
7918f24d
NC
1764 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1765
efaf3674 1766 ENTER;
d1d7a15d
NC
1767
1768 if (flags & G_WRITING_TO_STDERR) {
1769 SAVETMPS;
1770
2782061f 1771 save_re_context();
d1d7a15d
NC
1772 SAVESPTR(PL_stderrgv);
1773 PL_stderrgv = NULL;
1774 }
1775
efaf3674 1776 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1777 PUSHMARK(SP);
efaf3674 1778
052a7c76
DM
1779 /* EXTEND() expects a signed argc; don't wrap when casting */
1780 assert(argc <= I32_MAX);
1781 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1782 PUSHs(SvTIED_obj(sv, mg));
1783 if (flags & G_UNDEF_FILL) {
1784 while (argc--) {
efaf3674 1785 PUSHs(&PL_sv_undef);
93965878 1786 }
67549bd2 1787 } else if (argc > 0) {
046b0c7d
NC
1788 va_list args;
1789 va_start(args, argc);
1790
1791 do {
1792 SV *const sv = va_arg(args, SV *);
1793 PUSHs(sv);
1794 } while (--argc);
1795
1796 va_end(args);
88e89b8a 1797 }
463ee0b2 1798 PUTBACK;
efaf3674 1799 if (flags & G_DISCARD) {
36925d9e 1800 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1801 }
1802 else {
36925d9e 1803 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1804 ret = *PL_stack_sp--;
1805 }
1806 POPSTACK;
d1d7a15d
NC
1807 if (flags & G_WRITING_TO_STDERR)
1808 FREETMPS;
efaf3674
DM
1809 LEAVE;
1810 return ret;
1811}
1812
efaf3674 1813/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1814
efaf3674 1815STATIC SV*
36925d9e 1816S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1817 int n, SV *val)
1818{
efaf3674
DM
1819 SV* arg1 = NULL;
1820
1821 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1822
1823 if (mg->mg_ptr) {
1824 if (mg->mg_len >= 0) {
db4b3a1d 1825 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1826 }
1827 else if (mg->mg_len == HEf_SVKEY)
1828 arg1 = MUTABLE_SV(mg->mg_ptr);
1829 }
1830 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1831 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1832 sv_2mortal(arg1);
1833 }
1834 if (!arg1) {
046b0c7d 1835 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1836 }
046b0c7d 1837 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1838}
1839
76e3520e 1840STATIC int
36925d9e 1841S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1842{
efaf3674 1843 SV* ret;
463ee0b2 1844
7918f24d
NC
1845 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1846
efaf3674
DM
1847 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1848 if (ret)
1849 sv_setsv(sv, ret);
a0d0e21e
LW
1850 return 0;
1851}
463ee0b2 1852
a0d0e21e 1853int
864dbfa3 1854Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1855{
7918f24d
NC
1856 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1857
fd69380d 1858 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1859 mg->mg_flags |= MGf_GSKIP;
36925d9e 1860 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1861 return 0;
1862}
1863
1864int
864dbfa3 1865Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1866{
b112cff9
DM
1867 MAGIC *tmg;
1868 SV *val;
7918f24d
NC
1869
1870 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1871
b112cff9
DM
1872 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1873 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1874 * public flags indicate its value based on copying from $val. Doing
1875 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1876 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1877 * wrong if $val happened to be tainted, as sv hasn't got magic
1878 * enabled, even though taint magic is in the chain. In which case,
1879 * fake up a temporary tainted value (this is easier than temporarily
1880 * re-enabling magic on sv). */
1881
284167a5 1882 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1883 && (tmg->mg_len & 1))
1884 {
1885 val = sv_mortalcopy(sv);
1886 SvTAINTED_on(val);
1887 }
1888 else
1889 val = sv;
1890
36925d9e 1891 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1892 return 0;
1893}
1894
1895int
864dbfa3 1896Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1897{
7918f24d
NC
1898 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1899
4c13be3f 1900 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1901 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1902}
463ee0b2 1903
93965878
NIS
1904
1905U32
864dbfa3 1906Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1907{
22846ab4 1908 I32 retval = 0;
efaf3674 1909 SV* retsv;
93965878 1910
7918f24d
NC
1911 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1912
36925d9e 1913 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1914 if (retsv) {
1915 retval = SvIV(retsv)-1;
22846ab4
AB
1916 if (retval < -1)
1917 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1918 }
22846ab4 1919 return (U32) retval;
93965878
NIS
1920}
1921
cea2e8a9
GS
1922int
1923Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1924{
7918f24d
NC
1925 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1926
36925d9e 1927 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1928 return 0;
1929}
1930
1931int
864dbfa3 1932Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1933{
efaf3674 1934 SV* ret;
463ee0b2 1935
7918f24d
NC
1936 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1937
36925d9e
RZ
1938 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1939 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1940 if (ret)
1941 sv_setsv(key,ret);
79072805
LW
1942 return 0;
1943}
1944
1945int
1146e912 1946Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1947{
7918f24d
NC
1948 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1949
36925d9e 1950 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1951}
a0d0e21e 1952
a3bcc51e
TP
1953SV *
1954Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1955{
5fcbf73d 1956 SV *retval;
ad64d0ec
NC
1957 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1958 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1959
7918f24d
NC
1960 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1961
a3bcc51e
TP
1962 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1963 SV *key;
bfcb3514 1964 if (HvEITER_get(hv))
a3bcc51e
TP
1965 /* we are in an iteration so the hash cannot be empty */
1966 return &PL_sv_yes;
1967 /* no xhv_eiter so now use FIRSTKEY */
1968 key = sv_newmortal();
ad64d0ec 1969 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1970 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1971 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1972 }
1973
1974 /* there is a SCALAR method that we can call */
36925d9e 1975 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1976 if (!retval)
5fcbf73d 1977 retval = &PL_sv_undef;
a3bcc51e
TP
1978 return retval;
1979}
1980
a0d0e21e 1981int
864dbfa3 1982Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1983{
089b5c60 1984 SV **svp;
7918f24d
NC
1985
1986 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1987
089b5c60
NC
1988 /* The magic ptr/len for the debugger's hash should always be an SV. */
1989 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
1990 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 1991 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
1992 }
1993
1994 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
1995 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
1996 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
1997 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 1998
8772537c 1999 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2000 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2001 if (o) {
2002#ifdef PERL_DEBUG_READONLY_OPS
2003 Slab_to_rw(OpSLAB(o));
2004#endif
2005 /* set or clear breakpoint in the relevant control op */
089b5c60 2006 if (SvTRUE(sv))
88df5f01 2007 o->op_flags |= OPf_SPECIAL;
8772537c 2008 else
88df5f01
FC
2009 o->op_flags &= ~OPf_SPECIAL;
2010#ifdef PERL_DEBUG_READONLY_OPS
2011 Slab_to_ro(OpSLAB(o));
2012#endif
8772537c 2013 }
5df8de69 2014 }
79072805
LW
2015 return 0;
2016}
2017
2018int
8772537c 2019Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2020{
502c6561 2021 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2022
2023 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2024
83bf042f 2025 if (obj) {
e1dccc0d 2026 sv_setiv(sv, AvFILL(obj));
83bf042f 2027 } else {
d4a823b3 2028 sv_setsv(sv, NULL);
83bf042f 2029 }
79072805
LW
2030 return 0;
2031}
2032
2033int
864dbfa3 2034Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2035{
502c6561 2036 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2037
2038 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2039
83bf042f 2040 if (obj) {
e1dccc0d 2041 av_fill(obj, SvIV(sv));
83bf042f 2042 } else {
a2a5de95
NC
2043 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2044 "Attempt to set length of freed array");
83bf042f
NC
2045 }
2046 return 0;
2047}
2048
2049int
83f29afa
VP
2050Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2051{
83f29afa
VP
2052 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2053 PERL_UNUSED_ARG(sv);
dc3bf405 2054 PERL_UNUSED_CONTEXT;
83f29afa
VP
2055
2056 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2057#if IVSIZE == I32SIZE
2058 *((IV *) &(mg->mg_len)) = 0;
2059#else
83f29afa
VP
2060 if (mg->mg_ptr)
2061 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2062#endif
83f29afa
VP
2063
2064 return 0;
2065}
2066
2067int
83bf042f
NC
2068Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2069{
7918f24d 2070 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2071 PERL_UNUSED_ARG(sv);
7918f24d 2072
94f3782b
DM
2073 /* during global destruction, mg_obj may already have been freed */
2074 if (PL_in_clean_all)
1ea47f64 2075 return 0;
94f3782b 2076
83bf042f
NC
2077 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2078
2079 if (mg) {
2080 /* arylen scalar holds a pointer back to the array, but doesn't own a
2081 reference. Hence the we (the array) are about to go away with it
2082 still pointing at us. Clear its pointer, else it would be pointing
2083 at free memory. See the comment in sv_magic about reference loops,
2084 and why it can't own a reference to us. */
2085 mg->mg_obj = 0;
2086 }
a0d0e21e
LW
2087 return 0;
2088}
2089
2090int
864dbfa3 2091Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2092{
16eb5365 2093 SV* const lsv = LvTARG(sv);
96c2a8ff 2094 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2095
2096 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2097 PERL_UNUSED_ARG(mg);
ac27b0f5 2098
6174b39a
FC
2099 if (found && found->mg_len != -1) {
2100 STRLEN i = found->mg_len;
25fdce4a 2101 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2102 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2103 sv_setuv(sv, i);
a0d0e21e 2104 return 0;
a0d0e21e 2105 }
35995e5c 2106 sv_setsv(sv,NULL);
a0d0e21e
LW
2107 return 0;
2108}
2109
2110int
864dbfa3 2111Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2112{
16eb5365 2113 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2114 SSize_t pos;
2115 STRLEN len;
c00206c8 2116 STRLEN ulen = 0;
53d44271 2117 MAGIC* found;
aec43834 2118 const char *s;
a0d0e21e 2119
7918f24d 2120 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2121 PERL_UNUSED_ARG(mg);
ac27b0f5 2122
96c2a8ff 2123 found = mg_find_mglob(lsv);
3881461a 2124 if (!found) {
a0d0e21e
LW
2125 if (!SvOK(sv))
2126 return 0;
96c2a8ff 2127 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2128 }
2129 else if (!SvOK(sv)) {
3881461a 2130 found->mg_len = -1;
a0d0e21e
LW
2131 return 0;
2132 }
aec43834 2133 s = SvPV_const(lsv, len);
a0d0e21e 2134
e1dccc0d 2135 pos = SvIV(sv);
a0ed51b3 2136
7e2040f0 2137 if (DO_UTF8(lsv)) {
aec43834 2138 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2139 if (ulen)
2140 len = ulen;
a0ed51b3
LW
2141 }
2142
a0d0e21e
LW
2143 if (pos < 0) {
2144 pos += len;
2145 if (pos < 0)
2146 pos = 0;
2147 }
eb160463 2148 else if (pos > (SSize_t)len)
a0d0e21e 2149 pos = len;
a0ed51b3 2150
3881461a 2151 found->mg_len = pos;
25fdce4a 2152 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2153
79072805
LW
2154 return 0;
2155}
2156
2157int
864dbfa3 2158Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2159{
2160 STRLEN len;
35a4481c 2161 SV * const lsv = LvTARG(sv);
b83604b4 2162 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2163 STRLEN offs = LvTARGOFF(sv);
2164 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2165 const bool negoff = LvFLAGS(sv) & 1;
2166 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2167
2168 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2169 PERL_UNUSED_ARG(mg);
6ff81951 2170
83f78d1a 2171 if (!translate_substr_offsets(
4ddea69a 2172 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2173 negoff ? -(IV)offs : (IV)offs, !negoff,
2174 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2175 )) {
2176 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2177 sv_setsv_nomg(sv, &PL_sv_undef);
2178 return 0;
2179 }
2180
9aa983d2 2181 if (SvUTF8(lsv))
4ddea69a 2182 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2183 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2184 if (SvUTF8(lsv))
2ef4b674 2185 SvUTF8_on(sv);
6ff81951
GS
2186 return 0;
2187}
2188
2189int
864dbfa3 2190Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2191{
83f78d1a 2192 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2193 const char * const tmps = SvPV_const(sv, len);
dd374669 2194 SV * const lsv = LvTARG(sv);
777f7c56
EB
2195 STRLEN lvoff = LvTARGOFF(sv);
2196 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2197 const bool negoff = LvFLAGS(sv) & 1;
2198 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2199
2200 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2201 PERL_UNUSED_ARG(mg);
075a4a2b 2202
a74fb2cd
FC
2203 SvGETMAGIC(lsv);
2204 if (SvROK(lsv))
2205 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2206 "Attempt to use reference as lvalue in substr"
2207 );
fc061ed8
FC
2208 SvPV_force_nomg(lsv,lsv_len);
2209 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2210 if (!translate_substr_offsets(
2211 lsv_len,
2212 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2213 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2214 ))
2215 Perl_croak(aTHX_ "substr outside of string");
2216 oldtarglen = lvlen;
1aa99e6b 2217 if (DO_UTF8(sv)) {
73a087f0 2218 sv_utf8_upgrade_nomg(lsv);
d931b1be 2219 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2220 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2221 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2222 SvUTF8_on(lsv);
2223 }
0d336106 2224 else if (SvUTF8(lsv)) {
5fcbf73d 2225 const char *utf8;
d931b1be 2226 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2227 newtarglen = len;
5fcbf73d 2228 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2229 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2230 Safefree(utf8);
1aa99e6b 2231 }
b76f3ce2 2232 else {
a74fb2cd 2233 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2234 newtarglen = len;
b76f3ce2 2235 }
83f78d1a
FC
2236 if (!neglen) LvTARGLEN(sv) = newtarglen;
2237 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2238
79072805
LW
2239 return 0;
2240}
2241
2242int
864dbfa3 2243Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2244{
7918f24d 2245 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2246 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2247#ifdef NO_TAINT_SUPPORT
2248 PERL_UNUSED_ARG(mg);
2249#endif
7918f24d 2250
64ff300b 2251 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2252 return 0;
2253}
2254
2255int
864dbfa3 2256Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2257{
7918f24d 2258 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2259 PERL_UNUSED_ARG(sv);
7918f24d 2260
b01e650a 2261 /* update taint status */
284167a5 2262 if (TAINT_get)
b01e650a
DM
2263 mg->mg_len |= 1;
2264 else
2265 mg->mg_len &= ~1;
463ee0b2
LW
2266 return 0;
2267}
2268
2269int
864dbfa3 2270Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2271{
35a4481c 2272 SV * const lsv = LvTARG(sv);
7918f24d
NC
2273
2274 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2275 PERL_UNUSED_ARG(mg);
6ff81951 2276
2e9e14dd 2277 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2278
6ff81951
GS
2279 return 0;
2280}
2281
2282int
864dbfa3 2283Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2284{
7918f24d 2285 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2286 PERL_UNUSED_ARG(mg);
79072805
LW
2287 do_vecset(sv); /* XXX slurp this routine */
2288 return 0;
2289}
2290
13733cde
FC
2291SV *
2292Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2293{
a0714e2c 2294 SV *targ = NULL;
13733cde
FC
2295 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2296 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2297 assert(mg);
5f05dabc 2298 if (LvTARGLEN(sv)) {
68dc0745 2299 if (mg->mg_obj) {
8772537c 2300 SV * const ahv = LvTARG(sv);
85fbaab2 2301 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2302 if (he)
2303 targ = HeVAL(he);
68dc0745 2304 }
bbfdc870 2305 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2306 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2307 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2308 {
2309 if (SvRMAGICAL(av)) {
2310 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2311 targ = svp ? *svp : NULL;
2312 }
2313 else
bbfdc870 2314 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2315 }
68dc0745 2316 }
46da273f 2317 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2318 /* somebody else defined it for us */
2319 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2320 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2321 LvTARGLEN(sv) = 0;
2322 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2323 mg->mg_obj = NULL;
68dc0745
PP
2324 mg->mg_flags &= ~MGf_REFCOUNTED;
2325 }
13733cde 2326 return targ;
5f05dabc 2327 }
71be2cbc 2328 else
13733cde
FC
2329 return LvTARG(sv);
2330}
2331
2332int
2333Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2334{
2335 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2336
2337 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2338 return 0;
2339}
2340
2341int
864dbfa3 2342Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2343{
7918f24d 2344 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2345 PERL_UNUSED_ARG(mg);
71be2cbc 2346 if (LvTARGLEN(sv))
68dc0745
PP
2347 vivify_defelem(sv);
2348 if (LvTARG(sv)) {
5f05dabc 2349 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2350 SvSETMAGIC(LvTARG(sv));
2351 }
5f05dabc
PP
2352 return 0;
2353}
2354
71be2cbc 2355void
864dbfa3 2356Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2357{
74e13ce4 2358 MAGIC *mg;
a0714e2c 2359 SV *value = NULL;
71be2cbc 2360
7918f24d
NC
2361 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2362
14befaf4 2363 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2364 return;
68dc0745 2365 if (mg->mg_obj) {
8772537c 2366 SV * const ahv = LvTARG(sv);
85fbaab2 2367 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2368 if (he)
2369 value = HeVAL(he);
3280af22 2370 if (!value || value == &PL_sv_undef)
be2597df 2371 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2372 }
bbfdc870
FC
2373 else if (LvSTARGOFF(sv) < 0)
2374 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2375 else {
502c6561 2376 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2377 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2378 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2379 else {
bbfdc870 2380 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2381 if (!svp || !(value = *svp))
bbfdc870 2382 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2383 }
2384 }
b37c2d43 2385 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2386 SvREFCNT_dec(LvTARG(sv));
2387 LvTARG(sv) = value;
71be2cbc 2388 LvTARGLEN(sv) = 0;
68dc0745 2389 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2390 mg->mg_obj = NULL;
68dc0745 2391 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2392}
2393
2394int
864dbfa3 2395Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2396{
7918f24d 2397 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2398 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2399 return 0;
810b8aa5
GS
2400}
2401
2402int
864dbfa3 2403Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2404{
7918f24d 2405 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2406 PERL_UNUSED_CONTEXT;
0177730e 2407 PERL_UNUSED_ARG(sv);
565764a8 2408 mg->mg_len = -1;
93a17b20
LW
2409 return 0;
2410}
2411
2412int
864dbfa3 2413Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2414{
35a4481c 2415 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2416
7918f24d
NC
2417 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2418
79072805 2419 if (uf && uf->uf_set)
24f81a43 2420 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2421 return 0;
2422}
2423
c277df42 2424int
faf82a0b
AE
2425Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2426{
488344d2 2427 const char type = mg->mg_type;
7918f24d
NC
2428
2429 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2430
488344d2
NC
2431 if (type == PERL_MAGIC_qr) {
2432 } else if (type == PERL_MAGIC_bm) {
2433 SvTAIL_off(sv);
2434 SvVALID_off(sv);
2435 } else {
2436 assert(type == PERL_MAGIC_fm);
488344d2
NC
2437 }
2438 return sv_unmagic(sv, type);
faf82a0b
AE
2439}
2440
7a4c00b4 2441#ifdef USE_LOCALE_COLLATE
79072805 2442int
864dbfa3 2443Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2444{
7918f24d
NC
2445 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2446
bbce6d69 2447 /*
838b5b74 2448 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2449 * and vanished with a faint plop.
2450 */
96a5add6 2451 PERL_UNUSED_CONTEXT;
8772537c 2452 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2453 if (mg->mg_ptr) {
2454 Safefree(mg->mg_ptr);
2455 mg->mg_ptr = NULL;
565764a8 2456 mg->mg_len = -1;
7a4c00b4 2457 }
bbce6d69
PP
2458 return 0;
2459}
7a4c00b4 2460#endif /* USE_LOCALE_COLLATE */
bbce6d69 2461
7e8c5dac
HS
2462/* Just clear the UTF-8 cache data. */
2463int
2464Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2465{
7918f24d 2466 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2467 PERL_UNUSED_CONTEXT;
8772537c 2468 PERL_UNUSED_ARG(sv);
7e8c5dac 2469 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2470 mg->mg_ptr = NULL;
7e8c5dac
HS
2471 mg->mg_len = -1; /* The mg_len holds the len cache. */
2472 return 0;
2473}
2474
bbce6d69 2475int
9cce4f9a
FC
2476Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2477{
9782ce69 2478 const char *bad = NULL;
9cce4f9a 2479 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2480 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2481 switch (mg->mg_private & OPpLVREF_TYPE) {
2482 case OPpLVREF_SV:
2483 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2484 bad = " SCALAR";
2485 break;
2486 case OPpLVREF_AV:
2487 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2488 bad = "n ARRAY";
2489 break;
2490 case OPpLVREF_HV:
2491 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2492 bad = " HASH";
2493 break;
2494 case OPpLVREF_CV:
2495 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2496 bad = " CODE";
2497 }
2498 if (bad)
26a50d99 2499 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2500 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2501 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2502 case 0:
2503 {
2504 SV * const old = PAD_SV(mg->mg_len);
2505 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2506 SvREFCNT_dec(old);
2507 break;
2508 }
2509 case SVt_PVGV:
2510 gv_setref(mg->mg_obj, sv);
2511 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2512 break;
2513 case SVt_PVAV:
2514 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2515 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2516 break;
2517 case SVt_PVHV:
7fcb36d5
JH
2518 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2519 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2520 }
d39c26a6
FC
2521 if (mg->mg_flags & MGf_PERSIST)
2522 NOOP; /* This sv is in use as an iterator var and will be reused,
2523 so we must leave the magic. */
2524 else
2525 /* This sv could be returned by the assignment op, so clear the
2526 magic, as lvrefs are an implementation detail that must not be
2527 leaked to the user. */
2528 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2529 return 0;
2530}
2531
f1540bed
JH
2532static void
2533S_set_dollarzero(pTHX_ SV *sv)
2534 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2535{
2536#ifdef USE_ITHREADS
2537 dVAR;
2538#endif
2539 const char *s;
2540 STRLEN len;
f1540bed
JH
2541#ifdef HAS_SETPROCTITLE
2542 /* The BSDs don't show the argv[] in ps(1) output, they
2543 * show a string from the process struct and provide
2544 * the setproctitle() routine to manipulate that. */
2545 if (PL_origalen != 1) {
2546 s = SvPV_const(sv, len);
2547# if __FreeBSD_version > 410001
2548 /* The leading "-" removes the "perl: " prefix,
2549 * but not the "(perl) suffix from the ps(1)
2550 * output, because that's what ps(1) shows if the
2551 * argv[] is modified. */
2552 setproctitle("-%s", s);
2553# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2554 /* This doesn't really work if you assume that
2555 * $0 = 'foobar'; will wipe out 'perl' from the $0
2556 * because in ps(1) output the result will be like
2557 * sprintf("perl: %s (perl)", s)
2558 * I guess this is a security feature:
2559 * one (a user process) cannot get rid of the original name.
2560 * --jhi */
2561 setproctitle("%s", s);
2562# endif
2563 }
2564#elif defined(__hpux) && defined(PSTAT_SETCMD)
2565 if (PL_origalen != 1) {
2566 union pstun un;
2567 s = SvPV_const(sv, len);
2568 un.pst_command = (char *)s;
2569 pstat(PSTAT_SETCMD, un, len, 0, 0);
2570 }
2571#else
2572 if (PL_origalen > 1) {
4f3e04fd 2573 I32 i;
f1540bed
JH
2574 /* PL_origalen is set in perl_parse(). */
2575 s = SvPV_force(sv,len);
2576 if (len >= (STRLEN)PL_origalen-1) {
2577 /* Longer than original, will be truncated. We assume that
2578 * PL_origalen bytes are available. */
2579 Copy(s, PL_origargv[0], PL_origalen-1, char);
2580 }
2581 else {
2582 /* Shorter than original, will be padded. */
2583#ifdef PERL_DARWIN
2584 /* Special case for Mac OS X: see [perl #38868] */
2585 const int pad = 0;
2586#else
2587 /* Is the space counterintuitive? Yes.
2588 * (You were expecting \0?)
2589 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2590 * --jhi */
2591 const int pad = ' ';
2592#endif
2593 Copy(s, PL_origargv[0], len, char);
2594 PL_origargv[0][len] = 0;
2595 memset(PL_origargv[0] + len + 1,
2596 pad, PL_origalen - len - 1);
2597 }
2598 PL_origargv[0][PL_origalen-1] = 0;
2599 for (i = 1; i < PL_origargc; i++)
2600 PL_origargv[i] = 0;
2601#ifdef HAS_PRCTL_SET_NAME
2602 /* Set the legacy process name in addition to the POSIX name on Linux */
2603 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2604 /* diag_listed_as: SKIPME */
2605 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2606 }
2607#endif
2608 }
2609#endif
2610}
2611
9cce4f9a 2612int
864dbfa3 2613Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2614{
20b7effb 2615#ifdef USE_ITHREADS
97aff369 2616 dVAR;
20b7effb 2617#endif
eb578fdb
KW
2618 I32 paren;
2619 const REGEXP * rx;
79072805 2620 I32 i;
8990e307 2621 STRLEN len;
125b9982 2622 MAGIC *tmg;
2fdbfb4d 2623
7918f24d
NC
2624 PERL_ARGS_ASSERT_MAGIC_SET;
2625
e91d8259 2626 if (!mg->mg_ptr) {
960b831f 2627 paren = mg->mg_len;
1e05feb3 2628 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2629 setparen_got_rx:
2fdbfb4d 2630 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2631 } else {
2fdbfb4d
AB
2632 /* Croak with a READONLY error when a numbered match var is
2633 * set without a previous pattern match. Unless it's C<local $1>
2634 */
e91d8259 2635 croakparen:
2fdbfb4d 2636 if (!PL_localizing) {
cb077ed2 2637 Perl_croak_no_modify();
2fdbfb4d
AB
2638 }
2639 }
e91d8259
NC
2640 return 0;
2641 }
2642
2643 switch (*mg->mg_ptr) {
748a9306 2644 case '\001': /* ^A */
f2da823f
FC
2645 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2646 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2647 FmLINES(PL_bodytarget) = 0;
2648 if (SvPOK(PL_bodytarget)) {
2649 char *s = SvPVX(PL_bodytarget);
2650 while ( ((s = strchr(s, '\n'))) ) {
2651 FmLINES(PL_bodytarget)++;
2652 s++;
2653 }
2654 }
125b9982 2655 /* mg_set() has temporarily made sv non-magical */
284167a5 2656 if (TAINTING_get) {
125b9982
NT
2657 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2658 SvTAINTED_on(PL_bodytarget);
2659 else
2660 SvTAINTED_off(PL_bodytarget);
2661 }
748a9306 2662 break;
49460fe6 2663 case '\003': /* ^C */
f2338a2e 2664 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2665 break;
2666
79072805 2667 case '\004': /* ^D */
b4ab917c 2668#ifdef DEBUGGING
a9e2d2bf
DM
2669 {
2670 const char *s = SvPV_nolen_const(sv);
2671 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2672 if (DEBUG_x_TEST || DEBUG_B_TEST)
2673 dump_all_perl(!DEBUG_B_TEST);
2674 }
b4ab917c 2675#else
38ab35f8 2676 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2677#endif
79072805 2678 break;
28f23441 2679 case '\005': /* ^E */
d0063567 2680 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2681#ifdef VMS
38ab35f8 2682 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2683#else
2684# ifdef WIN32
d0063567 2685 SetLastError( SvIV(sv) );
e37778c2
NC
2686# else
2687# ifdef OS2
38ab35f8 2688 os2_setsyserrno(SvIV(sv));
e37778c2 2689# else
d0063567 2690 /* will anyone ever use this? */
38ab35f8 2691 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2692# endif
2693# endif
22fae026 2694#endif
d0063567 2695 }
3e669301 2696 else {
a15a3d9b 2697 if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
d5b4785c
DIM
2698 if (PL_localizing != 2) {
2699 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
a15a3d9b 2700 "${^ENCODING} is no longer supported");
d5b4785c 2701 }
3e669301 2702 }
d0063567 2703 break;
79072805 2704 case '\006': /* ^F */
38ab35f8 2705 PL_maxsysfd = SvIV(sv);
79072805 2706 break;
a0d0e21e 2707 case '\010': /* ^H */
38ab35f8 2708 PL_hints = SvIV(sv);
a0d0e21e 2709 break;
9d116dd7 2710 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2711 Safefree(PL_inplace);
bd61b366 2712 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2713 break;
d9bad346
FC
2714 case '\016': /* ^N */
2715 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2716 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2717 goto croakparen;
28f23441 2718 case '\017': /* ^O */
ac27b0f5 2719 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2720 Safefree(PL_osname);
bd61b366 2721 PL_osname = NULL;
3511154c
DM
2722 if (SvOK(sv)) {
2723 TAINT_PROPER("assigning to $^O");
2e0de35c 2724 PL_osname = savesvpv(sv);
3511154c 2725 }
ac27b0f5
NIS
2726 }
2727 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2728 STRLEN len;
2729 const char *const start = SvPV(sv, len);
b54fc2b6 2730 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2731 SV *tmp;
8b850bd5
NC
2732
2733
2734 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2735 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2736
2737 /* Opening for input is more common than opening for output, so
2738 ensure that hints for input are sooner on linked list. */
59cd0e26 2739 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2740 SvUTF8(sv))
2741 : newSVpvs_flags("", SvUTF8(sv));
2742 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2743 mg_set(tmp);
8b850bd5 2744
f747ebd6
Z
2745 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2746 SvUTF8(sv));
2747 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2748 mg_set(tmp);
ac27b0f5 2749 }
28f23441 2750 break;
79072805 2751 case '\020': /* ^P */
2fdbfb4d
AB
2752 PL_perldb = SvIV(sv);
2753 if (PL_perldb && !PL_DBsingle)
2754 init_debugger();
9b9e0be4 2755 break;
79072805 2756 case '\024': /* ^T */
88e89b8a 2757#ifdef BIG_TIME
6b88bc9c 2758 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2759#else
38ab35f8 2760 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2761#endif
79072805 2762 break;
e07ea26a
NC
2763 case '\025': /* ^UTF8CACHE */
2764 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2765 PL_utf8cache = (signed char) sv_2iv(sv);
2766 }
2767 break;
fde18df1 2768 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2769 if (*(mg->mg_ptr+1) == '\0') {
2770 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2771 i = SvIV(sv);
ac27b0f5 2772 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2773 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2774 }
599cee73 2775 }
0a378802 2776 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2777 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2778 if (!SvPOK(sv)) {
2779 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2780 break;
2781 }
f4fc7782 2782 {
b5477537 2783 STRLEN len, i;
d3a7d8c7 2784 int accumulate = 0 ;
f4fc7782 2785 int any_fatals = 0 ;
b83604b4 2786 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2787 for (i = 0 ; i < len ; ++i) {
2788 accumulate |= ptr[i] ;
2789 any_fatals |= (ptr[i] & 0xAA) ;
2790 }
4243c432
NC
2791 if (!accumulate) {
2792 if (!specialWARN(PL_compiling.cop_warnings))
2793 PerlMemShared_free(PL_compiling.cop_warnings);
2794 PL_compiling.cop_warnings = pWARN_NONE;
2795 }
3c3f8cd6
AB
2796 /* Yuck. I can't see how to abstract this: */
2797 else if (isWARN_on(
2798 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2799 WARN_ALL)
2800 && !any_fatals)
2801 {
2802 if (!specialWARN(PL_compiling.cop_warnings))
2803 PerlMemShared_free(PL_compiling.cop_warnings);
2804 PL_compiling.cop_warnings = pWARN_ALL;
2805 PL_dowarn |= G_WARN_ONCE ;
2806 }
d3a7d8c7 2807 else {
72dc9ed5
NC
2808 STRLEN len;
2809 const char *const p = SvPV_const(sv, len);
2810
2811 PL_compiling.cop_warnings
8ee4cf24 2812 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2813 p, len);
2814
d3a7d8c7
GS
2815 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2816 PL_dowarn |= G_WARN_ONCE ;
2817 }
f4fc7782 2818
d3a7d8c7 2819 }
4438c4b7 2820 }
971a9dd3 2821 }
8ca2a5d6
DD
2822#ifdef WIN32
2823 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2824 w32_sloppystat = (bool)sv_true(sv);
2825 }
2826#endif
79072805
LW
2827 break;
2828 case '.':
3280af22
NIS
2829 if (PL_localizing) {
2830 if (PL_localizing == 1)
7766f137 2831 SAVESPTR(PL_last_in_gv);
748a9306 2832 }
3280af22 2833 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2834 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2835 break;
2836 case '^':
acbe1b9d 2837 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2838 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2839 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2840 break;
2841 case '~':
acbe1b9d 2842 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2843 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2844 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2845 break;
2846 case '=':
acbe1b9d 2847 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2848 break;
2849 case '-':
acbe1b9d
FC
2850 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2851 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2852 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2853 break;
2854 case '%':
acbe1b9d 2855 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2856 break;
2857 case '|':
4b65379b 2858 {
099be4f1 2859 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2860 if(!io)
2861 break;
38ab35f8 2862 if ((SvIV(sv)) == 0)
4b65379b
CS
2863 IoFLAGS(io) &= ~IOf_FLUSH;
2864 else {
2865 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2866 PerlIO *ofp = IoOFP(io);
2867 if (ofp)
2868 (void)PerlIO_flush(ofp);
2869 IoFLAGS(io) |= IOf_FLUSH;
2870 }
2871 }
79072805
LW
2872 }
2873 break;
79072805 2874 case '/':
1ab48e3a
YO
2875 {
2876 SV *tmpsv= sv;
2877 if (SvROK(sv)) {
2878 SV *referent= SvRV(sv);
2879 const char *reftype= sv_reftype(referent, 0);
2880 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2881 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2882 * a full string comparison on the return of sv_reftype() both of which
2883 * make me feel worse! NOTE, do not modify this comment without reviewing the
2884 * corresponding comment in sv_reftype(). - Yves */
2885 if (reftype[0] == 'S' || reftype[0] == 'L') {
2886 IV val= SvIV(referent);
2887 if (val <= 0) {
2888 tmpsv= &PL_sv_undef;
ddc3d23f 2889 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1ab48e3a
YO
2890 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2891 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2892 );
2893 }
2894 } else {
ddce084a 2895 sv_setsv(sv, PL_rs);
ee0ba734 2896 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
2897 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2898 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
2899 }
2900 }
b3a2acfa 2901 SvREFCNT_dec(PL_rs);
1ab48e3a 2902 PL_rs = newSVsv(tmpsv);
b3a2acfa 2903 }
79072805
LW
2904 break;
2905 case '\\':
ef8d46e8 2906 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2907 if (SvOK(sv)) {
7889fe52 2908 PL_ors_sv = newSVsv(sv);
009c130f 2909 }
e3c19b7b 2910 else {
a0714e2c 2911 PL_ors_sv = NULL;
e3c19b7b 2912 }
79072805 2913 break;
7d69d4a6
FC
2914 case '[':
2915 if (SvIV(sv) != 0)
2916 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2917 break;
79072805 2918 case '?':
ff0cee69 2919#ifdef COMPLEX_STATUS
6b88bc9c 2920 if (PL_localizing == 2) {
41cb7b2b 2921 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2922 PL_statusvalue = LvTARGOFF(sv);
2923 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2924 }
2925 else
2926#endif
2927#ifdef VMSISH_STATUS
2928 if (VMSISH_STATUS)
fb38d079 2929 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2930 else
2931#endif
38ab35f8 2932 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2933 break;
2934 case '!':
93189314
JH
2935 {
2936#ifdef VMS
2937# define PERL_VMS_BANG vaxc$errno
2938#else
2939# define PERL_VMS_BANG 0
2940#endif
27329181 2941#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2942 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2943 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2944#else
91487cfc 2945 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2946 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2947#endif
93189314 2948 }
79072805
LW
2949 break;
2950 case '<':
985213f2 2951 {
b469f1e0 2952 /* XXX $< currently silently ignores failures */
dfff4baf 2953 const Uid_t new_uid = SvUID(sv);
985213f2 2954 PL_delaymagic_uid = new_uid;
3280af22
NIS
2955 if (PL_delaymagic) {
2956 PL_delaymagic |= DM_RUID;
79072805
LW
2957 break; /* don't do magic till later */
2958 }
2959#ifdef HAS_SETRUID
b469f1e0 2960 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW
2961#else
2962#ifdef HAS_SETREUID
b469f1e0 2963 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 2964#else
85e6fe83 2965#ifdef HAS_SETRESUID
b469f1e0 2966 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 2967#else
985213f2 2968 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2969#ifdef PERL_DARWIN
2970 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2971 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 2972 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 2973#endif
b469f1e0 2974 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 2975 } else {
cea2e8a9 2976 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2977 }
79072805
LW
2978#endif
2979#endif
85e6fe83 2980#endif
79072805 2981 break;
985213f2 2982 }
79072805 2983 case '>':
985213f2 2984 {
b469f1e0 2985 /* XXX $> currently silently ignores failures */
dfff4baf 2986 const Uid_t new_euid = SvUID(sv);
985213f2 2987 PL_delaymagic_euid = new_euid;
3280af22
NIS
2988 if (PL_delaymagic) {
2989 PL_delaymagic |= DM_EUID;
79072805
LW
2990 break; /* don't do magic till later */
2991 }
2992#ifdef HAS_SETEUID
b469f1e0 2993 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW
2994#else
2995#ifdef HAS_SETREUID
b469f1e0 2996 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW
2997#else
2998#ifdef HAS_SETRESUID
b469f1e0 2999 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3000#else
985213f2 3001 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3002 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3003 else {
cea2e8a9 3004 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3005 }
79072805
LW
3006#endif
3007#endif
85e6fe83 3008#endif
79072805 3009 break;
985213f2 3010 }
79072805 3011 case '(':
985213f2 3012 {
b469f1e0 3013 /* XXX $( currently silently ignores failures */
dfff4baf 3014 const Gid_t new_gid = SvGID(sv);
985213f2 3015 PL_delaymagic_gid = new_gid;
3280af22
NIS
3016 if (PL_delaymagic) {
3017 PL_delaymagic |= DM_RGID;
79072805
LW
3018 break; /* don't do magic till later */
3019 }
3020#ifdef HAS_SETRGID
b469f1e0 3021 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW
3022#else
3023#ifdef HAS_SETREGID
b469f1e0 3024 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW
3025#else
3026#ifdef HAS_SETRESGID
b469f1e0 3027 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3028#else
985213f2 3029 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3030 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3031 else {
cea2e8a9 3032 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3033 }
79072805
LW
3034#endif
3035#endif
85e6fe83 3036#endif
79072805 3037 break;
985213f2 3038 }
79072805 3039 case ')':
985213f2 3040 {
0635704a
HS
3041/* (hv) best guess: maybe we'll need configure probes to do a better job,
3042 * but you can override it if you need to.
3043 */
3044#ifndef INVALID_GID
3045#define INVALID_GID ((Gid_t)-1)
3046#endif
b469f1e0 3047 /* XXX $) currently silently ignores failures */
dfff4baf 3048 Gid_t new_egid;
5cd24f17
PP
3049#ifdef HAS_SETGROUPS
3050 {
b83604b4 3051 const char *p = SvPV_const(sv, len);
757f63d8 3052 Groups_t *gary = NULL;
fdadaf77 3053 const char* endptr;
22ff3130 3054 UV uv;
fb4089e0 3055#ifdef _SC_NGROUPS_MAX
3056 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3057
3058 if (maxgrp < 0)
3059 maxgrp = NGROUPS;
3060#else
3061 int maxgrp = NGROUPS;
3062#endif
757f63d8
SP
3063
3064 while (isSPACE(*p))
3065 ++p;
22ff3130
HS
3066 if (grok_atoUV(p, &uv, &endptr))
3067 new_egid = (Gid_t)uv;
3068 else {
0635704a 3069 new_egid = INVALID_GID;
22ff3130
HS
3070 endptr = NULL;
3071 }
fb4089e0 3072 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3073 if (endptr == NULL)
3074 break;
3075 p = endptr;
757f63d8
SP
3076 while (isSPACE(*p))
3077 ++p;
3078 if (!*p)
3079 break;
fdadaf77 3080 if (!gary)
757f63d8
SP
3081 Newx(gary, i + 1, Groups_t);
3082 else
3083 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3084 if (grok_atoUV(p, &uv, &endptr))
3085 gary[i] = (Groups_t)uv;
3086 else {
0635704a 3087 gary[i] = INVALID_GID;
22ff3130
HS
3088 endptr = NULL;
3089 }
757f63d8
SP
3090 }
3091 if (i)
b469f1e0 3092 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3093 Safefree(gary);
5cd24f17
PP
3094 }
3095#else /* HAS_SETGROUPS */
dfff4baf 3096 new_egid = SvGID(sv);
5cd24f17 3097#endif /* HAS_SETGROUPS */
985213f2 3098 PL_delaymagic_egid = new_egid;
3280af22
NIS
3099 if (PL_delaymagic) {
3100 PL_delaymagic |= DM_EGID;
79072805
LW
3101 break; /* don't do magic till later */
3102 }
3103#ifdef HAS_SETEGID
b469f1e0 3104 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW
3105#else
3106#ifdef HAS_SETREGID
b469f1e0 3107 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW
3108#else
3109#ifdef HAS_SETRESGID
b469f1e0 3110 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3111#else
985213f2 3112 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3113 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3114 else {
cea2e8a9 3115 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3116 }
79072805
LW
3117#endif
3118#endif
85e6fe83 3119#endif
79072805 3120 break;
985213f2 3121 }
79072805 3122 case ':':
2d8e6c8d 3123 PL_chopset = SvPV_force(sv,len);
79072805 3124 break;
9cdac2a2
FC
3125 case '$': /* $$ */
3126 /* Store the pid in mg->mg_obj so we can tell when a fork has
3127 occurred. mg->mg_obj points to *$ by default, so clear it. */
3128 if (isGV(mg->mg_obj)) {
3129 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3130 SvREFCNT_dec(mg->mg_obj);
3131 mg->mg_flags |= MGf_REFCOUNTED;
3132 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3133 }
3134 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3135 break;
79072805 3136 case '0':
e2975953 3137 LOCK_DOLLARZERO_MUTEX;
f1540bed 3138 S_set_dollarzero(aTHX_ sv);
e2975953 3139 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3140 break;
3141 }
3142 return 0;
3143}
3144
3145I32
84c7b88c
BF
3146Perl_whichsig_sv(pTHX_ SV *sigsv)
3147{
3148 const char *sigpv;
3149 STRLEN siglen;
3150 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3151 sigpv = SvPV_const(sigsv, siglen);
3152 return whichsig_pvn(sigpv, siglen);
3153}
3154
3155I32
3156Perl_whichsig_pv(pTHX_ const char *sig)
3157{
3158 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3159 return whichsig_pvn(sig, strlen(sig));
3160}
3161
3162I32
3163Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3164{
eb578fdb 3165 char* const* sigv;
7918f24d 3166
84c7b88c 3167 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3168 PERL_UNUSED_CONTEXT;
79072805 3169
aadb217d 3170 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3171 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3172 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3173#ifdef SIGCLD
84c7b88c 3174 if (memEQs(sig, len, "CHLD"))
79072805
LW
3175 return SIGCLD;
3176#endif
3177#ifdef SIGCHLD
84c7b88c 3178 if (memEQs(sig, len, "CLD"))
79072805
LW
3179 return SIGCHLD;
3180#endif
7f1236c0 3181 return -1;
79072805
LW
3182}
3183
ecfc5424 3184Signal_t
1e82f5a6 3185#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3186Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3187#else
3188Perl_sighandler(int sig)
3189#endif
79072805 3190{
1018e26f
NIS
3191#ifdef PERL_GET_SIG_CONTEXT
3192 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3193#else
cea2e8a9 3194 dTHX;
71d280e3 3195#endif
79072805 3196 dSP;
a0714e2c
SS
3197 GV *gv = NULL;
3198 SV *sv = NULL;
8772537c 3199 SV * const tSv = PL_Sv;
601f1833 3200 CV *cv = NULL;
533c011a 3201 OP *myop = PL_op;
84902520 3202 U32 flags = 0;
8772537c 3203 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3204 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3205 SV *errsv_save = NULL;
71d280e3 3206
84902520 3207
727405f8 3208 if (!PL_psig_ptr[sig]) {
99ef548b 3209 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3210 PL_sig_name[sig]);
3211 exit(sig);
3212 }
ff0cee69 3213
a0d63a7b
DM
3214 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3215 /* Max number of items pushed there is 3*n or 4. We cannot fix
3216 infinity, so we fix 4 (in fact 5): */
3217 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3218 flags |= 1;
3219 PL_savestack_ix += 5; /* Protect save in progress. */
3220 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3221 }
84902520 3222 }
84902520 3223 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3224 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3225 || SvTYPE(cv) != SVt_PVCV) {
3226 HV *st;
f2c0649b 3227 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3228 }
84902520 3229
a0d0e21e 3230 if (!cv || !CvROOT(cv)) {
07c325bb 3231 const HEK * const hek = gv
1d6bb9ae
FC
3232 ? GvENAME_HEK(gv)
3233 : cv && CvNAMED(cv)
3234 ? CvNAME_HEK(cv)
07c325bb
FC
3235 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3236 if (hek)
3237 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3238 "SIG%s handler \"%"HEKf"\" not defined.\n",
ac892e4a 3239 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3240 /* diag_listed_as: SIG%s handler "%s" not defined */
3241 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3242 "SIG%s handler \"__ANON__\" not defined.\n",
3243 PL_sig_name[sig]);
00d579c5 3244 goto cleanup;
79072805
LW
3245 }
3246
0c4d3b5e
DM
3247 sv = PL_psig_name[sig]
3248 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3249 : newSVpv(PL_sig_name[sig],0);
72048cfe 3250 flags |= 8;
0c4d3b5e
DM
3251 SAVEFREESV(sv);
3252
a0d63a7b
DM
3253 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3254 /* make sure our assumption about the size of the SAVEs are correct:
3255 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3256 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3257 }
e336de0d 3258
e788e7d3 3259 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3260 PUSHMARK(SP);
79072805 3261 PUSHs(sv);
8aad04aa
JH
3262#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3263 {
3264 struct sigaction oact;
3265
3266 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3267 if (sip) {
3268 HV *sih = newHV();
ad64d0ec 3269 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3270 /* The siginfo fields signo, code, errno, pid, uid,
3271 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3272 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3273 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3274#ifdef HAS_SIGINFO_SI_ERRNO
3275 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3276#endif
3277#ifdef HAS_SIGINFO_SI_STATUS
3278 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3279#endif
3280#ifdef HAS_SIGINFO_SI_UID
3281 {
3282 SV *uid = newSV(0);
3283 sv_setuid(uid, sip->si_uid);
3284 (void)hv_stores(sih, "uid", uid);
3285 }
3286#endif
3287#ifdef HAS_SIGINFO_SI_PID
3288 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3289#endif
3290#ifdef HAS_SIGINFO_SI_ADDR
3291 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3292#endif
3293#ifdef HAS_SIGINFO_SI_BAND
3294 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3295#endif
8aad04aa 3296 EXTEND(SP, 2);
ad64d0ec 3297 PUSHs(rv);
22f1178f 3298 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3299 }
b4552a27 3300
8aad04aa
JH
3301 }
3302 }
3303#endif
79072805 3304 PUTBACK;
a0d0e21e 3305
100c03aa
JL
3306 errsv_save = newSVsv(ERRSV);
3307
ad64d0ec 3308 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3309
d3acc0f7 3310 POPSTACK;
eed484f9
DD
3311 {
3312 SV * const errsv = ERRSV;
3313 if (SvTRUE_NN(errsv)) {
3314 SvREFCNT_dec(errsv_save);
c22d665b 3315#ifndef PERL_MICRO
1b266415
NIS
3316 /* Handler "died", for example to get out of a restart-able read().
3317 * Before we re-do that on its behalf re-enable the signal which was
3318 * blocked by the system when we entered.
3319 */
c22d665b 3320#ifdef HAS_SIGPROCMASK
d488af49 3321#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3322 if (sip || uap)
c22d665b 3323#endif
eed484f9
DD
3324 {
3325 sigset_t set;
3326 sigemptyset(&set);
3327 sigaddset(&set,sig);
3328 sigprocmask(SIG_UNBLOCK, &set, NULL);
3329 }
c22d665b 3330#else
eed484f9
DD
3331 /* Not clear if this will work */
3332 (void)rsignal(sig, SIG_IGN);
3333 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3334#endif
3335#endif /* !PERL_MICRO */
eed484f9
DD
3336 die_sv(errsv);
3337 }
3338 else {
3339 sv_setsv(errsv, errsv_save);
3340 SvREFCNT_dec(errsv_save);
3341 }
100c03aa
JL
3342 }
3343
7b52d656 3344 cleanup:
0c4d3b5e
DM
3345 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3346 PL_savestack_ix = old_ss_ix;
72048cfe 3347 if (flags & 8)
2357bae7 3348 SvREFCNT_dec_NN(sv);
533c011a 3349 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3350
3280af22
NIS
3351 PL_Sv = tSv; /* Restore global temporaries. */
3352 PL_Xpv = tXpv;
53bb94e2 3353 return;
79072805 3354}
4e35701f
NIS
3355
3356
51371543 3357static void
8772537c 3358S_restore_magic(pTHX_ const void *p)
51371543 3359{
8772537c
AL
3360 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3361 SV* const sv = mgs->mgs_sv;
150b625d 3362 bool bumped;
51371543
GS
3363
3364 if (!sv)
3365 return;
3366
4bac9ae4
CS
3367 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3368 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC
3369 if (mgs->mgs_flags)
3370 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS
3371 else
3372 mg_magical(sv);
51371543
GS
3373 }
3374
150b625d 3375 bumped = mgs->mgs_bumped;
51371543
GS
3376 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3377
3378 /* If we're still on top of the stack, pop us off. (That condition
3379 * will be satisfied if restore_magic was called explicitly, but *not*
3380 * if it's being called via leave_scope.)
3381 * The reason for doing this is that otherwise, things like sv_2cv()
3382 * may leave alloc gunk on the savestack, and some code
3383 * (e.g. sighandler) doesn't expect that...
3384 */
3385 if (PL_savestack_ix == mgs->mgs_ss_ix)
3386 {
1be36ce0
NC
3387 UV popval = SSPOPUV;
3388 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3389 PL_savestack_ix -= 2;
1be36ce0
NC
3390 popval = SSPOPUV;
3391 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3392 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3393 }
150b625d
DM
3394 if (bumped) {
3395 if (SvREFCNT(sv) == 1) {
3396 /* We hold the last reference to this SV, which implies that the
3397 SV was deleted as a side effect of the routines we called.
3398 So artificially keep it alive a bit longer.
3399 We avoid turning on the TEMP flag, which can cause the SV's
3400 buffer to get stolen (and maybe other stuff). */
150b625d 3401 sv_2mortal(sv);
4bac9ae4 3402 SvTEMP_off(sv);
8985fe98 3403 }
150b625d 3404 else
2357bae7 3405 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3406 }
51371543
GS
3407}
3408
0c4d3b5e
DM
3409/* clean up the mess created by Perl_sighandler().
3410 * Note that this is only called during an exit in a signal handler;
3411 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3412 * skipped over. */
0c4d3b5e 3413
51371543 3414static void
8772537c 3415S_unwind_handler_stack(pTHX_ const void *p)
51371543 3416{
0c4d3b5e 3417 PERL_UNUSED_ARG(p);
7918f24d 3418
0c4d3b5e 3419 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3420}
1018e26f 3421
66610fdd 3422/*
b3ca2e83
NC
3423=for apidoc magic_sethint
3424
796b6530 3425Triggered by a store to C<%^H>, records the key/value pair to
c28fe1ec
NC
3426C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3427anything that would need a deep copy. Maybe we should warn if we find a
3428reference.
b3ca2e83
NC
3429
3430=cut
3431*/
3432int
3433Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3434{
ad64d0ec 3435 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3436 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3437
7918f24d
NC
3438 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3439
e6e3e454
NC
3440 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3441 an alternative leaf in there, with PL_compiling.cop_hints being used if
3442 it's NULL. If needed for threads, the alternative could lock a mutex,
3443 or take other more complex action. */
3444
5b9c0671
NC
3445 /* Something changed in %^H, so it will need to be restored on scope exit.
3446 Doing this here saves a lot of doing it manually in perl code (and
3447 forgetting to do it, and consequent subtle errors. */
3448 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3449 CopHINTHASH_set(&PL_compiling,
3450 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3451 return 0;
3452}
3453
3454/*
f175cff5 3455=for apidoc magic_clearhint
b3ca2e83 3456
796b6530 3457Triggered by a delete from C<%^H>, records the key to
c28fe1ec 3458C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3459
3460=cut
3461*/
3462int
3463Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3464{
7918f24d 3465 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3466 PERL_UNUSED_ARG(sv);
3467
5b9c0671 3468 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3469 CopHINTHASH_set(&PL_compiling,
e3352591
FC
3470 mg->mg_len == HEf_SVKEY
3471 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3472 MUTABLE_SV(mg->mg_ptr), 0, 0)
3473 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3474 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC
3475 return 0;
3476}
3477