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