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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' */
9f10db87 761 && ! is_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
ad2de1b2
KW
769SV*
770Perl__get_encoding(pTHX)
771{
3e669301
KW
772 /* For core Perl use only: Returns the $^ENCODING or 'use encoding' in
773 * effect; NULL if none.
774 *
775 * $^ENCODING maps to PL_encoding, and is the old way to do things, and is
776 * retained for backwards compatibility. Now, there is a shadow variable
777 * ${^E_NCODING} set only by the encoding pragma, used to give this pragma
778 * lexical scope, unlike the global scope it (shudder) used to have. This
779 * variable maps to PL_lex_encoding. Again for backwards compatibility,
780 * PL_encoding has precedence over PL_lex_encoding. The hints hash is used
781 * to determine if PL_lex_encoding is in scope, and hence valid. The hints
782 * hash only accepts simple values, so we can't put an Encode object into
783 * it, so we put the object into the global, and put a simple boolean into
784 * the hints hash giving whether the global is valid or not */
785
c79dccf4 786 dVAR;
3e669301
KW
787 SV *is_encoding;
788
789 if (PL_encoding) {
790 return PL_encoding;
791 }
792
793 if (! PL_lex_encoding) {
794 return NULL;
795 }
796
797 is_encoding = cop_hints_fetch_pvs(PL_curcop, "encoding", 0);
798 if ( is_encoding
799 && is_encoding != &PL_sv_placeholder
800 && SvIOK(is_encoding)
801 && SvIV(is_encoding)) /* non-zero mean valid */
802 {
803 return PL_lex_encoding;
804 }
ad2de1b2 805
3e669301 806 return NULL;
ad2de1b2
KW
807}
808
25bbd826
CB
809#ifdef VMS
810#include <descrip.h>
811#include <starlet.h>
812#endif
813
79072805 814int
864dbfa3 815Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 816{
eb578fdb
KW
817 I32 paren;
818 const char *s = NULL;
819 REGEXP *rx;
823a54a3 820 const char * const remaining = mg->mg_ptr + 1;
e91d8259 821 char nextchar;
79072805 822
7918f24d
NC
823 PERL_ARGS_ASSERT_MAGIC_GET;
824
e91d8259 825 if (!mg->mg_ptr) {
e91d8259 826 paren = mg->mg_len;
e91d8259 827 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 828 do_numbuf_fetch:
e91d8259
NC
829 CALLREG_NUMBUF_FETCH(rx,paren,sv);
830 } else {
831 sv_setsv(sv,&PL_sv_undef);
832 }
833 return 0;
834 }
835
836 nextchar = *remaining;
79072805 837 switch (*mg->mg_ptr) {
748a9306 838 case '\001': /* ^A */
f2da823f
FC
839 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
840 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT
841 if (SvTAINTED(PL_bodytarget))
842 SvTAINTED_on(sv);
748a9306 843 break;
e5218da5 844 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 845 if (nextchar == '\0') {
e5218da5
GA
846 sv_setiv(sv, (IV)PL_minus_c);
847 }
823a54a3 848 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
849 sv_setiv(sv, (IV)STATUS_NATIVE);
850 }
49460fe6
NIS
851 break;
852
79072805 853 case '\004': /* ^D */
aea4f609 854 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 855 break;
28f23441 856 case '\005': /* ^E */
6c6eab55
KW
857 if (nextchar != '\0') {
858 if (strEQ(remaining, "NCODING"))
ad2de1b2 859 sv_setsv(sv, _get_encoding());
199670db
FC
860 else if (strEQ(remaining, "_NCODING"))
861 sv_setsv(sv, NULL);
4f4ff3a7 862 break;
6c6eab55 863 }
4f4ff3a7
KW
864
865#if defined(VMS) || defined(OS2) || defined(WIN32)
866# if defined(VMS)
2a99ff86
KW
867 {
868 char msg[255];
869 $DESCRIPTOR(msgdsc,msg);
870 sv_setnv(sv,(NV) vaxc$errno);
871 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
872 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
873 else
874 sv_setpvs(sv,"");
875 }
4b645107 876#elif defined(OS2)
2a99ff86
KW
877 if (!(_emx_env & 0x200)) { /* Under DOS */
878 sv_setnv(sv, (NV)errno);
2c6ee1a7 879 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
880 } else {
881 if (errno != errno_isOS2) {
882 const int tmp = _syserrno();
883 if (tmp) /* 2nd call to _syserrno() makes it 0 */
884 Perl_rc = tmp;
885 }
886 sv_setnv(sv, (NV)Perl_rc);
887 sv_setpv(sv, os2error(Perl_rc));
888 }
1534c6f5 889 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
890 fixup_errno_string(sv);
891 }
4f4ff3a7 892# elif defined(WIN32)
2a99ff86
KW
893 {
894 const DWORD dwErr = GetLastError();
895 sv_setnv(sv, (NV)dwErr);
896 if (dwErr) {
897 PerlProc_GetOSError(sv, dwErr);
2efab60d 898 fixup_errno_string(sv);
2a99ff86
KW
899 }
900 else
901 sv_setpvs(sv, "");
902 SetLastError(dwErr);
903 }
4f4ff3a7
KW
904# else
905# error Missing code for platform
906# endif
2a99ff86
KW
907 SvRTRIM(sv);
908 SvNOK_on(sv); /* what a wonderful hack! */
909 break;
4f4ff3a7
KW
910#endif /* End of platforms with special handling for $^E; others just fall
911 through to $! */
46f3e16c
KW
912
913 case '!':
914 {
5f1b979d 915 dSAVE_ERRNO;
46f3e16c 916#ifdef VMS
5f1b979d 917 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 918#else
5f1b979d 919 sv_setnv(sv, (NV)errno);
46f3e16c
KW
920#endif
921#ifdef OS2
5f1b979d
KW
922 if (errno == errno_isOS2 || errno == errno_isOS2_set)
923 sv_setpv(sv, os2error(Perl_rc));
924 else
46f3e16c 925#endif
5f1b979d
KW
926 if (! errno) {
927 sv_setpvs(sv, "");
46f3e16c 928 }
5f1b979d
KW
929 else {
930
931 /* Strerror can return NULL on some platforms, which will
932 * result in 'sv' not being considered SvOK. The SvNOK_on()
933 * below will cause just the number part to be valid */
2c6ee1a7 934 sv_setpv(sv, my_strerror(errno));
5f1b979d
KW
935 if (SvOK(sv)) {
936 fixup_errno_string(sv);
937 }
938 }
939 RESTORE_ERRNO;
46f3e16c
KW
940 }
941
942 SvRTRIM(sv);
943 SvNOK_on(sv); /* what a wonderful hack! */
944 break;
945
79072805 946 case '\006': /* ^F */
3280af22 947 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 948 break;
9ebf26ad
FR
949 case '\007': /* ^GLOBAL_PHASE */
950 if (strEQ(remaining, "LOBAL_PHASE")) {
951 sv_setpvn(sv, PL_phase_names[PL_phase],
952 strlen(PL_phase_names[PL_phase]));
953 }
954 break;
a0d0e21e 955 case '\010': /* ^H */
3280af22 956 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 957 break;
9d116dd7 958 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 959 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 960 break;
8561ea1d
FC
961 case '\014': /* ^LAST_FH */
962 if (strEQ(remaining, "AST_FH")) {
963 if (PL_last_in_gv) {
964 assert(isGV_with_GP(PL_last_in_gv));
965 SV_CHECK_THINKFIRST_COW_DROP(sv);
966 prepare_SV_for_RV(sv);
967 SvOK_off(sv);
968 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
969 SvROK_on(sv);
970 sv_rvweaken(sv);
971 }
972 else sv_setsv_nomg(sv, NULL);
973 }
974 break;
ac27b0f5 975 case '\017': /* ^O & ^OPEN */
823a54a3 976 if (nextchar == '\0') {
ac27b0f5 977 sv_setpv(sv, PL_osname);
3511154c
DM
978 SvTAINTED_off(sv);
979 }
823a54a3 980 else if (strEQ(remaining, "PEN")) {
8b850bd5 981 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 982 }
28f23441 983 break;
9ebf26ad 984 case '\020':
a6d0b1b5 985 sv_setiv(sv, (IV)PL_perldb);
79072805 986 break;
fb73857a 987 case '\023': /* ^S */
a6d0b1b5 988 {
bc177e6b 989 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 990 SvOK_off(sv);
3280af22 991 else if (PL_in_eval)
6dc8a9e4 992 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
993 else
994 sv_setiv(sv, 0);
d58bf5aa 995 }
fb73857a 996 break;
79072805 997 case '\024': /* ^T */
823a54a3 998 if (nextchar == '\0') {
88e89b8a 999#ifdef BIG_TIME
7c36658b 1000 sv_setnv(sv, PL_basetime);
88e89b8a 1001#else
7c36658b 1002 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1003#endif
7c36658b 1004 }
823a54a3 1005 else if (strEQ(remaining, "AINT"))
284167a5
SM
1006 sv_setiv(sv, TAINTING_get
1007 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1008 : 0);
7c36658b 1009 break;
e07ea26a 1010 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1011 if (strEQ(remaining, "NICODE"))
a05d7ebb 1012 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1013 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1014 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1015 else if (strEQ(remaining, "TF8CACHE"))
1016 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1017 break;
1018 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1019 if (nextchar == '\0')
4438c4b7 1020 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 1021 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1022 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1023 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1024 }
1025 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC
1026 sv_setsv(sv, &PL_sv_undef);
1027 break;
013b78e8 1028 }
d3a7d8c7 1029 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
1030 /* Get the bit mask for $warnings::Bits{all}, because
1031 * it could have been extended by warnings::register */
4bac9ae4
CS
1032 HV * const bits = get_hv("warnings::Bits", 0);
1033 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1034 if (bits_all)
1035 sv_copypv(sv, *bits_all);
1036 else
1037 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1038 }
4438c4b7 1039 else {
72dc9ed5
NC
1040 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1041 *PL_compiling.cop_warnings);
ac27b0f5 1042 }
4438c4b7 1043 }
8ca2a5d6
DD
1044#ifdef WIN32
1045 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1046 sv_setiv(sv, w32_sloppystat);
1047 }
1048#endif
79072805 1049 break;
79072805 1050 case '+':
aaa362c4 1051 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1052 paren = RX_LASTPAREN(rx);
1053 if (paren)
1054 goto do_numbuf_fetch;
79072805 1055 }
3280af22 1056 sv_setsv(sv,&PL_sv_undef);
79072805 1057 break;
a01268b5
JH
1058 case '\016': /* ^N */
1059 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1060 paren = RX_LASTCLOSEPAREN(rx);
1061 if (paren)
1062 goto do_numbuf_fetch;
a01268b5
JH
1063 }
1064 sv_setsv(sv,&PL_sv_undef);
1065 break;
79072805 1066 case '.':
3280af22 1067 if (GvIO(PL_last_in_gv)) {
357c8808 1068 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1069 }
79072805
LW
1070 break;
1071 case '?':
809a5acc 1072 {
809a5acc 1073 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1074#ifdef COMPLEX_STATUS
41cb7b2b 1075 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1076 LvTARGOFF(sv) = PL_statusvalue;
1077 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1078#endif
809a5acc 1079 }
79072805
LW
1080 break;
1081 case '^':
acbe1b9d 1082 if (GvIOp(PL_defoutgv))
099be4f1 1083 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1084 if (s)
1085 sv_setpv(sv,s);
1086 else {
3280af22 1087 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1088 sv_catpvs(sv,"_TOP");
79072805
LW
1089 }
1090 break;
1091 case '~':
acbe1b9d 1092 if (GvIOp(PL_defoutgv))
0daa599b 1093 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1094 if (!s)
3280af22 1095 s = GvENAME(PL_defoutgv);
79072805
LW
1096 sv_setpv(sv,s);
1097 break;
79072805 1098 case '=':
099be4f1 1099 if (GvIO(PL_defoutgv))
0daa599b 1100 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1101 break;
1102 case '-':
099be4f1 1103 if (GvIO(PL_defoutgv))
0daa599b 1104 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1105 break;
1106 case '%':
099be4f1 1107 if (GvIO(PL_defoutgv))
0daa599b 1108 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1109 break;
79072805 1110 case ':':
79072805
LW
1111 case '/':
1112 break;
1113 case '[':
e1dccc0d 1114 sv_setiv(sv, 0);
79072805
LW
1115 break;
1116 case '|':
099be4f1 1117 if (GvIO(PL_defoutgv))
0daa599b 1118 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1119 break;
79072805 1120 case '\\':
b2ce0fda 1121 if (PL_ors_sv)
f28098ff 1122 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS
1123 else
1124 sv_setsv(sv, &PL_sv_undef);
79072805 1125 break;
0e219455 1126 case '$': /* $$ */
9cdac2a2
FC
1127 {
1128 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1129 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1130 /* never set manually, or at least not since last fork */
1131 sv_setiv(sv, pid);
19db9fb7
Z
1132 /* never unsafe, even if reading in a tainted expression */
1133 SvTAINTED_off(sv);
1134 }
9cdac2a2
FC
1135 /* else a value has been assigned manually, so do nothing */
1136 }
0e219455 1137 break;
79072805 1138 case '<':
dfff4baf 1139 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1140 break;
1141 case '>':
dfff4baf 1142 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1143 break;
1144 case '(':
dfff4baf 1145 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1146 goto add_groups;
1147 case ')':
dfff4baf 1148 sv_setgid(sv, PerlProc_getegid());
79072805 1149 add_groups:
79072805 1150#ifdef HAS_GETGROUPS
79072805 1151 {
57d7c65e 1152 Groups_t *gary = NULL;
375ed12a
JH
1153 I32 i;
1154 I32 num_groups = getgroups(0, gary);
1155 if (num_groups > 0) {
1156 Newx(gary, num_groups, Groups_t);
1157 num_groups = getgroups(num_groups, gary);
1158 for (i = 0; i < num_groups; i++)
1159 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1160 Safefree(gary);
1161 }
79072805 1162 }
155aba94 1163 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1164#endif
79072805 1165 break;
79072805
LW
1166 case '0':
1167 break;
1168 }
a0d0e21e 1169 return 0;
79072805
LW
1170}
1171
1172int
864dbfa3 1173Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1174{
8772537c 1175 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1176
7918f24d
NC
1177 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1178
79072805 1179 if (uf && uf->uf_val)
24f81a43 1180 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1181 return 0;
1182}
1183
1184int
864dbfa3 1185Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1186{
9ae3433d 1187 STRLEN len = 0, klen;
12033064 1188 const char * const key = MgPV_const(mg,klen);
888a67f6 1189 const char *s = "";
1e422769 1190
7918f24d
NC
1191 PERL_ARGS_ASSERT_MAGIC_SETENV;
1192
613c63b4 1193 SvGETMAGIC(sv);
12033064 1194 if (SvOK(sv)) {
613c63b4
CS
1195 /* defined environment variables are byte strings; unfortunately
1196 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1197 (void)SvPV_force_nomg_nolen(sv);
1198 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1199 if (SvUTF8(sv)) {
1200 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1201 SvUTF8_off(sv);
1202 }
1203 s = SvPVX(sv);
1204 len = SvCUR(sv);
12033064
CS
1205 }
1206 my_setenv(key, s); /* does the deed */
1207
a0d0e21e
LW
1208#ifdef DYNAMIC_ENV_FETCH
1209 /* We just undefd an environment var. Is a replacement */
1210 /* waiting in the wings? */
1211 if (!len) {
6bd66ee9 1212 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1213 if (valp)
4ab59fcc 1214 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1215 }
1216#endif
1e422769 1217
28542d8f 1218#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1219 /* And you'll never guess what the dog had */
1220 /* in its mouth... */
284167a5 1221 if (TAINTING_get) {
1e422769
PP
1222 MgTAINTEDDIR_off(mg);
1223#ifdef VMS
6bd66ee9 1224 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1225 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1226 int i = 0, j = 0;
1227
6fca0082 1228 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1229 elt = eltbuf;
1e422769
PP
1230 do { /* DCL$PATH may be a search list */
1231 while (1) { /* as may dev portion of any element */
1232 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1233 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1234 cando_by_name(S_IWUSR,0,elt) ) {
1235 MgTAINTEDDIR_on(mg);
1236 return 0;
1237 }
1238 }
bd61b366 1239 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1240 *cp = '\0';
1241 if (my_trnlnm(elt, eltbuf, j++))
1242 elt = eltbuf;
1243 else
1244 break;
1245 }
1246 j = 0;
1247 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1248 }
1249#endif /* VMS */
12033064 1250 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1251 const char * const strend = s + len;
463ee0b2
LW
1252
1253 while (s < strend) {
96827780 1254 char tmpbuf[256];
c623ac67 1255 Stat_t st;
5f74f29c 1256 I32 i;
f5a63d97
AL
1257#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1258 const char path_sep = '|';
1259#else
1260 const char path_sep = ':';
1261#endif
96827780 1262 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1263 s, strend, path_sep, &i);
463ee0b2 1264 s++;
bb7a0f54 1265 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1266#ifdef VMS
1267 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1268#else
1269 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1270#endif
c6ed36e1 1271 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1272 MgTAINTEDDIR_on(mg);
1e422769
PP
1273 return 0;
1274 }
463ee0b2 1275 }
79072805
LW
1276 }
1277 }
28542d8f 1278#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1279
79072805
LW
1280 return 0;
1281}
1282
1283int
864dbfa3 1284Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1285{
7918f24d 1286 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1287 PERL_UNUSED_ARG(sv);
bd61b366 1288 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1289 return 0;
1290}
1291
88e89b8a 1292int
864dbfa3 1293Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1294{
7918f24d 1295 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1296 PERL_UNUSED_ARG(mg);
b0269e46 1297#if defined(VMS)
cea2e8a9 1298 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1299#else
3280af22 1300 if (PL_localizing) {
fb73857a 1301 HE* entry;
b0269e46 1302 my_clearenv();
85fbaab2
NC
1303 hv_iterinit(MUTABLE_HV(sv));
1304 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1305 I32 keylen;
1306 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1307 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1308 }
1309 }
1310#endif
1311 return 0;
1312}
1313
1314int
864dbfa3 1315Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1316{
7918f24d 1317 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1318 PERL_UNUSED_ARG(sv);
1319 PERL_UNUSED_ARG(mg);
b0269e46
AB
1320#if defined(VMS)
1321 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1322#else
1323 my_clearenv();
1324#endif
3e3baf6d 1325 return 0;
66b1d557
HM
1326}
1327
64ca3a65 1328#ifndef PERL_MICRO
2d4fcd5e
AJ
1329#ifdef HAS_SIGPROCMASK
1330static void
1331restore_sigmask(pTHX_ SV *save_sv)
1332{
0bd48802 1333 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1334 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1335}
1336#endif
66b1d557 1337int
864dbfa3 1338Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1339{
88e89b8a 1340 /* Are we fetching a signal entry? */
708854f2 1341 int i = (I16)mg->mg_private;
7918f24d
NC
1342
1343 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1344
708854f2 1345 if (!i) {
84c7b88c
BF
1346 STRLEN siglen;
1347 const char * sig = MgPV_const(mg, siglen);
1348 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1349 }
1350
e02bfb16 1351 if (i > 0) {
22c35a8c
GS
1352 if(PL_psig_ptr[i])
1353 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1354 else {
46da273f 1355 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1356#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1357 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1358 sigstate = SIG_IGN;
2e34cc90
CL
1359#endif
1360#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1361 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1362 sigstate = SIG_DFL;
85b332e2 1363#endif
88e89b8a 1364 /* cache state so we don't fetch it again */
8aad04aa 1365 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1366 sv_setpvs(sv,"IGNORE");
88e89b8a 1367 else
3280af22 1368 sv_setsv(sv,&PL_sv_undef);
46da273f 1369 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1370 SvTEMP_off(sv);
1371 }
1372 }
1373 return 0;
1374}
1375int
864dbfa3 1376Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1377{
7918f24d 1378 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1379
38a124f0 1380 magic_setsig(NULL, mg);
179c85a2 1381 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1382}
3d37d572 1383
0a8e0eff 1384Signal_t
8aad04aa 1385#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1386Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1387#else
0a8e0eff 1388Perl_csighandler(int sig)
8aad04aa 1389#endif
0a8e0eff 1390{
1018e26f
NIS
1391#ifdef PERL_GET_SIG_CONTEXT
1392 dTHXa(PERL_GET_SIG_CONTEXT);
1393#else
85b332e2
CL
1394 dTHX;
1395#endif
1271a1be 1396#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1397#if defined(__cplusplus) && defined(__GNUC__)
1398 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1399 * parameters would be warned about. */
1400 PERL_UNUSED_ARG(sip);
1401 PERL_UNUSED_ARG(uap);
1402#endif
1271a1be 1403#endif
23ada85b 1404#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1405 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1406 if (PL_sig_ignoring[sig]) return;
85b332e2 1407#endif
2e34cc90 1408#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1409 if (PL_sig_defaulting[sig])
2e34cc90
CL
1410#ifdef KILL_BY_SIGPRC
1411 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1412#else
1413 exit(1);
1414#endif
1415#endif
406878dd 1416 if (
853d2c32
RGS
1417#ifdef SIGILL
1418 sig == SIGILL ||
1419#endif
1420#ifdef SIGBUS
1421 sig == SIGBUS ||
1422#endif
1423#ifdef SIGSEGV
1424 sig == SIGSEGV ||
1425#endif
1426 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1427 /* Call the perl level handler now--
31c91b43 1428 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1429#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1430 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1431#else
1432 (*PL_sighandlerp)(sig);
92807b6d 1433#endif
406878dd 1434 else {
31c91b43 1435 if (!PL_psig_pend) return;
406878dd
GA
1436 /* Set a flag to say this signal is pending, that is awaiting delivery after
1437 * the current Perl opcode completes */
1438 PL_psig_pend[sig]++;
1439
1440#ifndef SIG_PENDING_DIE_COUNT
1441# define SIG_PENDING_DIE_COUNT 120
1442#endif
fe13d51d 1443 /* Add one to say _a_ signal is pending */
406878dd
GA
1444 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1445 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1446 (unsigned long)SIG_PENDING_DIE_COUNT);
1447 }
0a8e0eff
NIS
1448}
1449
2e34cc90
CL
1450#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1451void
1452Perl_csighandler_init(void)
1453{
1454 int sig;
27da23d5 1455 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1456
1457 for (sig = 1; sig < SIG_SIZE; sig++) {
1458#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1459 dTHX;
27da23d5 1460 PL_sig_defaulting[sig] = 1;
5c1546dc 1461 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1462#endif
1463#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1464 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1465#endif
1466 }
27da23d5 1467 PL_sig_handlers_initted = 1;
2e34cc90
CL
1468}
1469#endif
1470
7fe50b8b
LT
1471#if defined HAS_SIGPROCMASK
1472static void
1473unblock_sigmask(pTHX_ void* newset)
1474{
dc3bf405 1475 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1476 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1477}
1478#endif
1479
0a8e0eff
NIS
1480void
1481Perl_despatch_signals(pTHX)
1482{
1483 int sig;
1484 PL_sig_pending = 0;
1485 for (sig = 1; sig < SIG_SIZE; sig++) {
1486 if (PL_psig_pend[sig]) {
d0166017 1487 dSAVE_ERRNO;
7fe50b8b 1488#ifdef HAS_SIGPROCMASK
55534442
LT
1489 /* From sigaction(2) (FreeBSD man page):
1490 * | Signal routines normally execute with the signal that
1491 * | caused their invocation blocked, but other signals may
1492 * | yet occur.
1493 * Emulation of this behavior (from within Perl) is enabled
1494 * using sigprocmask
1495 */
1496 int was_blocked;
1497 sigset_t newset, oldset;
1498
1499 sigemptyset(&newset);
1500 sigaddset(&newset, sig);
1501 sigprocmask(SIG_BLOCK, &newset, &oldset);
1502 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1503 if (!was_blocked) {
1504 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1505 ENTER;
1506 SAVEFREESV(save_sv);
1507 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1508 }
55534442 1509#endif
25da4428 1510 PL_psig_pend[sig] = 0;
6e324d09 1511#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1512 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1513#else
1514 (*PL_sighandlerp)(sig);
92807b6d 1515#endif
7fe50b8b 1516#ifdef HAS_SIGPROCMASK
55534442 1517 if (!was_blocked)
7fe50b8b 1518 LEAVE;
55534442 1519#endif
d0166017 1520 RESTORE_ERRNO;
0a8e0eff
NIS
1521 }
1522 }
1523}
1524
38a124f0 1525/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1526int
864dbfa3 1527Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1528{
27da23d5 1529 dVAR;
79072805 1530 I32 i;
cbbf8932 1531 SV** svp = NULL;
2d4fcd5e
AJ
1532 /* Need to be careful with SvREFCNT_dec(), because that can have side
1533 * effects (due to closures). We must make sure that the new disposition
1534 * is in place before it is called.
1535 */
cbbf8932 1536 SV* to_dec = NULL;
e72dc28c 1537 STRLEN len;
2d4fcd5e
AJ
1538#ifdef HAS_SIGPROCMASK
1539 sigset_t set, save;
1540 SV* save_sv;
1541#endif
eb578fdb 1542 const char *s = MgPV_const(mg,len);
7918f24d
NC
1543
1544 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1545
748a9306 1546 if (*s == '_') {
84c7b88c 1547 if (memEQs(s, len, "__DIE__"))
3280af22 1548 svp = &PL_diehook;
84c7b88c 1549 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1550 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1551 /* Merge the existing behaviours, which are as follows:
1552 magic_setsig, we always set svp to &PL_warnhook
1553 (hence we always change the warnings handler)
1554 For magic_clearsig, we don't change the warnings handler if it's
1555 set to the &PL_warnhook. */
3280af22 1556 svp = &PL_warnhook;
84c7b88c
BF
1557 } else if (sv) {
1558 SV *tmp = sv_newmortal();
1559 Perl_croak(aTHX_ "No such hook: %s",
1560 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1561 }
748a9306 1562 i = 0;
38a124f0 1563 if (svp && *svp) {
9289f461
RGS
1564 if (*svp != PERL_WARNHOOK_FATAL)
1565 to_dec = *svp;
cbbf8932 1566 *svp = NULL;
4633a7c4 1567 }
748a9306
LW
1568 }
1569 else {
708854f2
NC
1570 i = (I16)mg->mg_private;
1571 if (!i) {
84c7b88c 1572 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1573 mg->mg_private = (U16)i;
708854f2 1574 }
86d86cad 1575 if (i <= 0) {
84c7b88c
BF
1576 if (sv) {
1577 SV *tmp = sv_newmortal();
1578 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1579 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1580 }
748a9306
LW
1581 return 0;
1582 }
2d4fcd5e
AJ
1583#ifdef HAS_SIGPROCMASK
1584 /* Avoid having the signal arrive at a bad time, if possible. */
1585 sigemptyset(&set);
1586 sigaddset(&set,i);
1587 sigprocmask(SIG_BLOCK, &set, &save);
1588 ENTER;
9ff8e806 1589 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1590 SAVEFREESV(save_sv);
1591 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1592#endif
1593 PERL_ASYNC_CHECK();
2e34cc90 1594#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1595 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1596#endif
23ada85b 1597#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1598 PL_sig_ignoring[i] = 0;
85b332e2 1599#endif
2e34cc90 1600#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1601 PL_sig_defaulting[i] = 0;
2e34cc90 1602#endif
2d4fcd5e 1603 to_dec = PL_psig_ptr[i];
38a124f0
NC
1604 if (sv) {
1605 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1606 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1607
1608 /* Signals don't change name during the program's execution, so once
1609 they're cached in the appropriate slot of PL_psig_name, they can
1610 stay there.
1611
1612 Ideally we'd find some way of making SVs at (C) compile time, or
1613 at least, doing most of the work. */
1614 if (!PL_psig_name[i]) {
1615 PL_psig_name[i] = newSVpvn(s, len);
1616 SvREADONLY_on(PL_psig_name[i]);
1617 }
38a124f0 1618 } else {
79fd3822 1619 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1620 PL_psig_name[i] = NULL;
1621 PL_psig_ptr[i] = NULL;
1622 }
748a9306 1623 }
38a124f0 1624 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1625 if (i) {
5c1546dc 1626 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1627 }
748a9306 1628 else
b37c2d43 1629 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1630 } else {
9dfa190b
NC
1631 if (sv && SvOK(sv)) {
1632 s = SvPV_force(sv, len);
1633 } else {
1634 sv = NULL;
1635 }
84c7b88c 1636 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1637 if (i) {
23ada85b 1638#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1639 PL_sig_ignoring[i] = 1;
1640 (void)rsignal(i, PL_csighandlerp);
85b332e2 1641#else
9dfa190b 1642 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1643#endif
9dfa190b 1644 }
2d4fcd5e 1645 }
84c7b88c 1646 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1647 if (i) {
2e34cc90 1648#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1649 PL_sig_defaulting[i] = 1;
1650 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1651#else
9dfa190b 1652 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1653#endif
9dfa190b
NC
1654 }
1655 }
1656 else {
1657 /*
1658 * We should warn if HINT_STRICT_REFS, but without
1659 * access to a known hint bit in a known OP, we can't
1660 * tell whether HINT_STRICT_REFS is in force or not.
1661 */
1662 if (!strchr(s,':') && !strchr(s,'\''))
1663 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1664 SV_GMAGIC);
1665 if (i)
1666 (void)rsignal(i, PL_csighandlerp);
1667 else
1668 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1669 }
748a9306 1670 }
9dfa190b 1671
2d4fcd5e
AJ
1672#ifdef HAS_SIGPROCMASK
1673 if(i)
1674 LEAVE;
1675#endif
ef8d46e8 1676 SvREFCNT_dec(to_dec);
79072805
LW
1677 return 0;
1678}
64ca3a65 1679#endif /* !PERL_MICRO */
79072805
LW
1680
1681int
864dbfa3 1682Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1683{
7918f24d 1684 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1685 PERL_UNUSED_ARG(sv);
e1a479c5 1686
89c14e2e 1687 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1688 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1689 return 0;
1690
0e446081 1691 return magic_clearisa(NULL, mg);
463ee0b2
LW
1692}
1693
0e446081 1694/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1695int
52b45067
RD
1696Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1697{
52b45067 1698 HV* stash;
7918f24d
NC
1699 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1700
52b45067 1701 /* Bail out if destruction is going on */
627364f1 1702 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1703
0e446081
NC
1704 if (sv)
1705 av_clear(MUTABLE_AV(sv));
52b45067 1706
6624142a
FC
1707 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1708 /* This occurs with setisa_elem magic, which calls this
1709 same function. */
1710 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1711
316ebaf2 1712 assert(mg);
6624142a
FC
1713 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1714 SV **svp = AvARRAY((AV *)mg->mg_obj);
1715 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1716 while (items--) {
1717 stash = GvSTASH((GV *)*svp++);
1718 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1719 }
1720
1721 return 0;
1722 }
1723
52b45067 1724 stash = GvSTASH(
6624142a 1725 (const GV *)mg->mg_obj
52b45067
RD
1726 );
1727
00169e2c
FC
1728 /* The stash may have been detached from the symbol table, so check its
1729 name before doing anything. */
1730 if (stash && HvENAME_get(stash))
5562fa71 1731 mro_isa_changed_in(stash);
52b45067
RD
1732
1733 return 0;
1734}
1735
1736int
864dbfa3 1737Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1738{
85fbaab2 1739 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1740 I32 i = 0;
7918f24d
NC
1741
1742 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1743 PERL_UNUSED_ARG(mg);
7719e241 1744
6ff81951 1745 if (hv) {
497b47a8 1746 (void) hv_iterinit(hv);
ad64d0ec 1747 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1748 i = HvUSEDKEYS(hv);
497b47a8
JH
1749 else {
1750 while (hv_iternext(hv))
1751 i++;
1752 }
6ff81951
GS
1753 }
1754
1755 sv_setiv(sv, (IV)i);
1756 return 0;
1757}
1758
1759int
864dbfa3 1760Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1761{
7918f24d 1762 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1763 PERL_UNUSED_ARG(mg);
946ec16e 1764 if (LvTARG(sv)) {
85fbaab2 1765 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1766 }
1767 return 0;
ac27b0f5 1768}
946ec16e 1769
efaf3674
DM
1770/*
1771=for apidoc magic_methcall
1772
1773Invoke a magic method (like FETCH).
1774
2baee27b
FC
1775C<sv> and C<mg> are the tied thingy and the tie magic.
1776
1777C<meth> is the name of the method to call.
1778
1779C<argc> is the number of args (in addition to $self) to pass to the method.
1780
1781The C<flags> can be:
1782
1783 G_DISCARD invoke method with G_DISCARD flag and don't
1784 return a value
1785 G_UNDEF_FILL fill the stack with argc pointers to
1786 PL_sv_undef
1787
1788The arguments themselves are any values following the C<flags> argument.
efaf3674 1789
796b6530 1790Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1791
1792
1793=cut
1794*/
1795
1796SV*
36925d9e 1797Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1798 U32 argc, ...)
a0d0e21e
LW
1799{
1800 dSP;
efaf3674 1801 SV* ret = NULL;
463ee0b2 1802
7918f24d
NC
1803 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1804
efaf3674 1805 ENTER;
d1d7a15d
NC
1806
1807 if (flags & G_WRITING_TO_STDERR) {
1808 SAVETMPS;
1809
2782061f 1810 save_re_context();
d1d7a15d
NC
1811 SAVESPTR(PL_stderrgv);
1812 PL_stderrgv = NULL;
1813 }
1814
efaf3674 1815 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1816 PUSHMARK(SP);
efaf3674 1817
052a7c76
DM
1818 /* EXTEND() expects a signed argc; don't wrap when casting */
1819 assert(argc <= I32_MAX);
1820 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1821 PUSHs(SvTIED_obj(sv, mg));
1822 if (flags & G_UNDEF_FILL) {
1823 while (argc--) {
efaf3674 1824 PUSHs(&PL_sv_undef);
93965878 1825 }
67549bd2 1826 } else if (argc > 0) {
046b0c7d
NC
1827 va_list args;
1828 va_start(args, argc);
1829
1830 do {
1831 SV *const sv = va_arg(args, SV *);
1832 PUSHs(sv);
1833 } while (--argc);
1834
1835 va_end(args);
88e89b8a 1836 }
463ee0b2 1837 PUTBACK;
efaf3674 1838 if (flags & G_DISCARD) {
36925d9e 1839 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1840 }
1841 else {
36925d9e 1842 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1843 ret = *PL_stack_sp--;
1844 }
1845 POPSTACK;
d1d7a15d
NC
1846 if (flags & G_WRITING_TO_STDERR)
1847 FREETMPS;
efaf3674
DM
1848 LEAVE;
1849 return ret;
1850}
1851
efaf3674 1852/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1853
efaf3674 1854STATIC SV*
36925d9e 1855S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1856 int n, SV *val)
1857{
efaf3674
DM
1858 SV* arg1 = NULL;
1859
1860 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1861
1862 if (mg->mg_ptr) {
1863 if (mg->mg_len >= 0) {
db4b3a1d 1864 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1865 }
1866 else if (mg->mg_len == HEf_SVKEY)
1867 arg1 = MUTABLE_SV(mg->mg_ptr);
1868 }
1869 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1870 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1871 sv_2mortal(arg1);
1872 }
1873 if (!arg1) {
046b0c7d 1874 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1875 }
046b0c7d 1876 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1877}
1878
76e3520e 1879STATIC int
36925d9e 1880S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1881{
efaf3674 1882 SV* ret;
463ee0b2 1883
7918f24d
NC
1884 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1885
efaf3674
DM
1886 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1887 if (ret)
1888 sv_setsv(sv, ret);
a0d0e21e
LW
1889 return 0;
1890}
463ee0b2 1891
a0d0e21e 1892int
864dbfa3 1893Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1894{
7918f24d
NC
1895 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1896
fd69380d 1897 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1898 mg->mg_flags |= MGf_GSKIP;
36925d9e 1899 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1900 return 0;
1901}
1902
1903int
864dbfa3 1904Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1905{
b112cff9
DM
1906 MAGIC *tmg;
1907 SV *val;
7918f24d
NC
1908
1909 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1910
b112cff9
DM
1911 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1912 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1913 * public flags indicate its value based on copying from $val. Doing
1914 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1915 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1916 * wrong if $val happened to be tainted, as sv hasn't got magic
1917 * enabled, even though taint magic is in the chain. In which case,
1918 * fake up a temporary tainted value (this is easier than temporarily
1919 * re-enabling magic on sv). */
1920
284167a5 1921 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1922 && (tmg->mg_len & 1))
1923 {
1924 val = sv_mortalcopy(sv);
1925 SvTAINTED_on(val);
1926 }
1927 else
1928 val = sv;
1929
36925d9e 1930 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1931 return 0;
1932}
1933
1934int
864dbfa3 1935Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1936{
7918f24d
NC
1937 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1938
4c13be3f 1939 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1940 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1941}
463ee0b2 1942
93965878
NIS
1943
1944U32
864dbfa3 1945Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1946{
22846ab4 1947 I32 retval = 0;
efaf3674 1948 SV* retsv;
93965878 1949
7918f24d
NC
1950 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1951
36925d9e 1952 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1953 if (retsv) {
1954 retval = SvIV(retsv)-1;
22846ab4
AB
1955 if (retval < -1)
1956 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1957 }
22846ab4 1958 return (U32) retval;
93965878
NIS
1959}
1960
cea2e8a9
GS
1961int
1962Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1963{
7918f24d
NC
1964 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1965
36925d9e 1966 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1967 return 0;
1968}
1969
1970int
864dbfa3 1971Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1972{
efaf3674 1973 SV* ret;
463ee0b2 1974
7918f24d
NC
1975 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1976
36925d9e
RZ
1977 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1978 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1979 if (ret)
1980 sv_setsv(key,ret);
79072805
LW
1981 return 0;
1982}
1983
1984int
1146e912 1985Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1986{
7918f24d
NC
1987 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1988
36925d9e 1989 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1990}
a0d0e21e 1991
a3bcc51e
TP
1992SV *
1993Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1994{
5fcbf73d 1995 SV *retval;
ad64d0ec
NC
1996 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1997 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1998
7918f24d
NC
1999 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2000
a3bcc51e
TP
2001 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2002 SV *key;
bfcb3514 2003 if (HvEITER_get(hv))
a3bcc51e
TP
2004 /* we are in an iteration so the hash cannot be empty */
2005 return &PL_sv_yes;
2006 /* no xhv_eiter so now use FIRSTKEY */
2007 key = sv_newmortal();
ad64d0ec 2008 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2009 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2010 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2011 }
2012
2013 /* there is a SCALAR method that we can call */
36925d9e 2014 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2015 if (!retval)
5fcbf73d 2016 retval = &PL_sv_undef;
a3bcc51e
TP
2017 return retval;
2018}
2019
a0d0e21e 2020int
864dbfa3 2021Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2022{
089b5c60 2023 SV **svp;
7918f24d
NC
2024
2025 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2026
089b5c60
NC
2027 /* The magic ptr/len for the debugger's hash should always be an SV. */
2028 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2029 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 2030 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2031 }
2032
2033 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2034 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2035 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2036 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2037
8772537c 2038 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2039 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2040 if (o) {
2041#ifdef PERL_DEBUG_READONLY_OPS
2042 Slab_to_rw(OpSLAB(o));
2043#endif
2044 /* set or clear breakpoint in the relevant control op */
089b5c60 2045 if (SvTRUE(sv))
88df5f01 2046 o->op_flags |= OPf_SPECIAL;
8772537c 2047 else
88df5f01
FC
2048 o->op_flags &= ~OPf_SPECIAL;
2049#ifdef PERL_DEBUG_READONLY_OPS
2050 Slab_to_ro(OpSLAB(o));
2051#endif
8772537c 2052 }
5df8de69 2053 }
79072805
LW
2054 return 0;
2055}
2056
2057int
8772537c 2058Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2059{
502c6561 2060 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2061
2062 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2063
83bf042f 2064 if (obj) {
e1dccc0d 2065 sv_setiv(sv, AvFILL(obj));
83bf042f 2066 } else {
d4a823b3 2067 sv_setsv(sv, NULL);
83bf042f 2068 }
79072805
LW
2069 return 0;
2070}
2071
2072int
864dbfa3 2073Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2074{
502c6561 2075 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2076
2077 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2078
83bf042f 2079 if (obj) {
e1dccc0d 2080 av_fill(obj, SvIV(sv));
83bf042f 2081 } else {
a2a5de95
NC
2082 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2083 "Attempt to set length of freed array");
83bf042f
NC
2084 }
2085 return 0;
2086}
2087
2088int
83f29afa
VP
2089Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2090{
83f29afa
VP
2091 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2092 PERL_UNUSED_ARG(sv);
dc3bf405 2093 PERL_UNUSED_CONTEXT;
83f29afa
VP
2094
2095 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2096#if IVSIZE == I32SIZE
2097 *((IV *) &(mg->mg_len)) = 0;
2098#else
83f29afa
VP
2099 if (mg->mg_ptr)
2100 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2101#endif
83f29afa
VP
2102
2103 return 0;
2104}
2105
2106int
83bf042f
NC
2107Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2108{
7918f24d 2109 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2110 PERL_UNUSED_ARG(sv);
7918f24d 2111
94f3782b
DM
2112 /* during global destruction, mg_obj may already have been freed */
2113 if (PL_in_clean_all)
1ea47f64 2114 return 0;
94f3782b 2115
83bf042f
NC
2116 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2117
2118 if (mg) {
2119 /* arylen scalar holds a pointer back to the array, but doesn't own a
2120 reference. Hence the we (the array) are about to go away with it
2121 still pointing at us. Clear its pointer, else it would be pointing
2122 at free memory. See the comment in sv_magic about reference loops,
2123 and why it can't own a reference to us. */
2124 mg->mg_obj = 0;
2125 }
a0d0e21e
LW
2126 return 0;
2127}
2128
2129int
864dbfa3 2130Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2131{
16eb5365 2132 SV* const lsv = LvTARG(sv);
96c2a8ff 2133 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2134
2135 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2136 PERL_UNUSED_ARG(mg);
ac27b0f5 2137
6174b39a
FC
2138 if (found && found->mg_len != -1) {
2139 STRLEN i = found->mg_len;
25fdce4a 2140 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2141 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2142 sv_setuv(sv, i);
a0d0e21e 2143 return 0;
a0d0e21e 2144 }
35995e5c 2145 sv_setsv(sv,NULL);
a0d0e21e
LW
2146 return 0;
2147}
2148
2149int
864dbfa3 2150Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2151{
16eb5365 2152 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2153 SSize_t pos;
2154 STRLEN len;
c00206c8 2155 STRLEN ulen = 0;
53d44271 2156 MAGIC* found;
aec43834 2157 const char *s;
a0d0e21e 2158
7918f24d 2159 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2160 PERL_UNUSED_ARG(mg);
ac27b0f5 2161
96c2a8ff 2162 found = mg_find_mglob(lsv);
3881461a 2163 if (!found) {
a0d0e21e
LW
2164 if (!SvOK(sv))
2165 return 0;
96c2a8ff 2166 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2167 }
2168 else if (!SvOK(sv)) {
3881461a 2169 found->mg_len = -1;
a0d0e21e
LW
2170 return 0;
2171 }
aec43834 2172 s = SvPV_const(lsv, len);
a0d0e21e 2173
e1dccc0d 2174 pos = SvIV(sv);
a0ed51b3 2175
7e2040f0 2176 if (DO_UTF8(lsv)) {
aec43834 2177 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2178 if (ulen)
2179 len = ulen;
a0ed51b3
LW
2180 }
2181
a0d0e21e
LW
2182 if (pos < 0) {
2183 pos += len;
2184 if (pos < 0)
2185 pos = 0;
2186 }
eb160463 2187 else if (pos > (SSize_t)len)
a0d0e21e 2188 pos = len;
a0ed51b3 2189
3881461a 2190 found->mg_len = pos;
25fdce4a 2191 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2192
79072805
LW
2193 return 0;
2194}
2195
2196int
864dbfa3 2197Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2198{
2199 STRLEN len;
35a4481c 2200 SV * const lsv = LvTARG(sv);
b83604b4 2201 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2202 STRLEN offs = LvTARGOFF(sv);
2203 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2204 const bool negoff = LvFLAGS(sv) & 1;
2205 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2206
2207 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2208 PERL_UNUSED_ARG(mg);
6ff81951 2209
83f78d1a 2210 if (!translate_substr_offsets(
4ddea69a 2211 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2212 negoff ? -(IV)offs : (IV)offs, !negoff,
2213 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2214 )) {
2215 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2216 sv_setsv_nomg(sv, &PL_sv_undef);
2217 return 0;
2218 }
2219
9aa983d2 2220 if (SvUTF8(lsv))
4ddea69a 2221 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2222 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2223 if (SvUTF8(lsv))
2ef4b674 2224 SvUTF8_on(sv);
6ff81951
GS
2225 return 0;
2226}
2227
2228int
864dbfa3 2229Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2230{
83f78d1a 2231 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2232 const char * const tmps = SvPV_const(sv, len);
dd374669 2233 SV * const lsv = LvTARG(sv);
777f7c56
EB
2234 STRLEN lvoff = LvTARGOFF(sv);
2235 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2236 const bool negoff = LvFLAGS(sv) & 1;
2237 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2238
2239 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2240 PERL_UNUSED_ARG(mg);
075a4a2b 2241
a74fb2cd
FC
2242 SvGETMAGIC(lsv);
2243 if (SvROK(lsv))
2244 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2245 "Attempt to use reference as lvalue in substr"
2246 );
fc061ed8
FC
2247 SvPV_force_nomg(lsv,lsv_len);
2248 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2249 if (!translate_substr_offsets(
2250 lsv_len,
2251 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2252 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2253 ))
2254 Perl_croak(aTHX_ "substr outside of string");
2255 oldtarglen = lvlen;
1aa99e6b 2256 if (DO_UTF8(sv)) {
73a087f0 2257 sv_utf8_upgrade_nomg(lsv);
d931b1be 2258 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2259 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2260 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2261 SvUTF8_on(lsv);
2262 }
0d336106 2263 else if (SvUTF8(lsv)) {
5fcbf73d 2264 const char *utf8;
d931b1be 2265 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2266 newtarglen = len;
5fcbf73d 2267 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2268 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2269 Safefree(utf8);
1aa99e6b 2270 }
b76f3ce2 2271 else {
a74fb2cd 2272 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2273 newtarglen = len;
b76f3ce2 2274 }
83f78d1a
FC
2275 if (!neglen) LvTARGLEN(sv) = newtarglen;
2276 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2277
79072805
LW
2278 return 0;
2279}
2280
2281int
864dbfa3 2282Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2283{
7918f24d 2284 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2285 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2286#ifdef NO_TAINT_SUPPORT
2287 PERL_UNUSED_ARG(mg);
2288#endif
7918f24d 2289
64ff300b 2290 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2291 return 0;
2292}
2293
2294int
864dbfa3 2295Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2296{
7918f24d 2297 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2298 PERL_UNUSED_ARG(sv);
7918f24d 2299
b01e650a 2300 /* update taint status */
284167a5 2301 if (TAINT_get)
b01e650a
DM
2302 mg->mg_len |= 1;
2303 else
2304 mg->mg_len &= ~1;
463ee0b2
LW
2305 return 0;
2306}
2307
2308int
864dbfa3 2309Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2310{
35a4481c 2311 SV * const lsv = LvTARG(sv);
7918f24d
NC
2312
2313 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2314 PERL_UNUSED_ARG(mg);
6ff81951 2315
2e9e14dd 2316 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2317
6ff81951
GS
2318 return 0;
2319}
2320
2321int
864dbfa3 2322Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2323{
7918f24d 2324 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2325 PERL_UNUSED_ARG(mg);
79072805
LW
2326 do_vecset(sv); /* XXX slurp this routine */
2327 return 0;
2328}
2329
13733cde
FC
2330SV *
2331Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2332{
a0714e2c 2333 SV *targ = NULL;
13733cde
FC
2334 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2335 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2336 assert(mg);
5f05dabc 2337 if (LvTARGLEN(sv)) {
68dc0745 2338 if (mg->mg_obj) {
8772537c 2339 SV * const ahv = LvTARG(sv);
85fbaab2 2340 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2341 if (he)
2342 targ = HeVAL(he);
68dc0745 2343 }
bbfdc870 2344 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2345 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2346 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2347 {
2348 if (SvRMAGICAL(av)) {
2349 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2350 targ = svp ? *svp : NULL;
2351 }
2352 else
bbfdc870 2353 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2354 }
68dc0745 2355 }
46da273f 2356 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2357 /* somebody else defined it for us */
2358 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2359 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2360 LvTARGLEN(sv) = 0;
2361 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2362 mg->mg_obj = NULL;
68dc0745
PP
2363 mg->mg_flags &= ~MGf_REFCOUNTED;
2364 }
13733cde 2365 return targ;
5f05dabc 2366 }
71be2cbc 2367 else
13733cde
FC
2368 return LvTARG(sv);
2369}
2370
2371int
2372Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2373{
2374 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2375
2376 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2377 return 0;
2378}
2379
2380int
864dbfa3 2381Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2382{
7918f24d 2383 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2384 PERL_UNUSED_ARG(mg);
71be2cbc 2385 if (LvTARGLEN(sv))
68dc0745
PP
2386 vivify_defelem(sv);
2387 if (LvTARG(sv)) {
5f05dabc 2388 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2389 SvSETMAGIC(LvTARG(sv));
2390 }
5f05dabc
PP
2391 return 0;
2392}
2393
71be2cbc 2394void
864dbfa3 2395Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2396{
74e13ce4 2397 MAGIC *mg;
a0714e2c 2398 SV *value = NULL;
71be2cbc 2399
7918f24d
NC
2400 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2401
14befaf4 2402 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2403 return;
68dc0745 2404 if (mg->mg_obj) {
8772537c 2405 SV * const ahv = LvTARG(sv);
85fbaab2 2406 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2407 if (he)
2408 value = HeVAL(he);
3280af22 2409 if (!value || value == &PL_sv_undef)
be2597df 2410 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2411 }
bbfdc870
FC
2412 else if (LvSTARGOFF(sv) < 0)
2413 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2414 else {
502c6561 2415 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2416 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2417 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2418 else {
bbfdc870 2419 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2420 if (!svp || !(value = *svp))
bbfdc870 2421 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2422 }
2423 }
b37c2d43 2424 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2425 SvREFCNT_dec(LvTARG(sv));
2426 LvTARG(sv) = value;
71be2cbc 2427 LvTARGLEN(sv) = 0;
68dc0745 2428 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2429 mg->mg_obj = NULL;
68dc0745 2430 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2431}
2432
2433int
864dbfa3 2434Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2435{
7918f24d 2436 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2437 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2438 return 0;
810b8aa5
GS
2439}
2440
2441int
864dbfa3 2442Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2443{
7918f24d 2444 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2445 PERL_UNUSED_CONTEXT;
0177730e 2446 PERL_UNUSED_ARG(sv);
565764a8 2447 mg->mg_len = -1;
93a17b20
LW
2448 return 0;
2449}
2450
2451int
864dbfa3 2452Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2453{
35a4481c 2454 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2455
7918f24d
NC
2456 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2457
79072805 2458 if (uf && uf->uf_set)
24f81a43 2459 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2460 return 0;
2461}
2462
c277df42 2463int
faf82a0b
AE
2464Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2465{
488344d2 2466 const char type = mg->mg_type;
7918f24d
NC
2467
2468 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2469
488344d2
NC
2470 if (type == PERL_MAGIC_qr) {
2471 } else if (type == PERL_MAGIC_bm) {
2472 SvTAIL_off(sv);
2473 SvVALID_off(sv);
2474 } else {
2475 assert(type == PERL_MAGIC_fm);
488344d2
NC
2476 }
2477 return sv_unmagic(sv, type);
faf82a0b
AE
2478}
2479
7a4c00b4 2480#ifdef USE_LOCALE_COLLATE
79072805 2481int
864dbfa3 2482Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2483{
7918f24d
NC
2484 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2485
bbce6d69 2486 /*
838b5b74 2487 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2488 * and vanished with a faint plop.
2489 */
96a5add6 2490 PERL_UNUSED_CONTEXT;
8772537c 2491 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2492 if (mg->mg_ptr) {
2493 Safefree(mg->mg_ptr);
2494 mg->mg_ptr = NULL;
565764a8 2495 mg->mg_len = -1;
7a4c00b4 2496 }
bbce6d69
PP
2497 return 0;
2498}
7a4c00b4 2499#endif /* USE_LOCALE_COLLATE */
bbce6d69 2500
7e8c5dac
HS
2501/* Just clear the UTF-8 cache data. */
2502int
2503Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2504{
7918f24d 2505 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2506 PERL_UNUSED_CONTEXT;
8772537c 2507 PERL_UNUSED_ARG(sv);
7e8c5dac 2508 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2509 mg->mg_ptr = NULL;
7e8c5dac
HS
2510 mg->mg_len = -1; /* The mg_len holds the len cache. */
2511 return 0;
2512}
2513
bbce6d69 2514int
9cce4f9a
FC
2515Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2516{
9782ce69 2517 const char *bad = NULL;
9cce4f9a 2518 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2519 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2520 switch (mg->mg_private & OPpLVREF_TYPE) {
2521 case OPpLVREF_SV:
2522 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2523 bad = " SCALAR";
2524 break;
2525 case OPpLVREF_AV:
2526 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2527 bad = "n ARRAY";
2528 break;
2529 case OPpLVREF_HV:
2530 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2531 bad = " HASH";
2532 break;
2533 case OPpLVREF_CV:
2534 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2535 bad = " CODE";
2536 }
2537 if (bad)
26a50d99 2538 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2539 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2540 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2541 case 0:
2542 {
2543 SV * const old = PAD_SV(mg->mg_len);
2544 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2545 SvREFCNT_dec(old);
2546 break;
2547 }
2548 case SVt_PVGV:
2549 gv_setref(mg->mg_obj, sv);
2550 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2551 break;
2552 case SVt_PVAV:
2553 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2554 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2555 break;
2556 case SVt_PVHV:
7fcb36d5
JH
2557 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2558 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2559 }
d39c26a6
FC
2560 if (mg->mg_flags & MGf_PERSIST)
2561 NOOP; /* This sv is in use as an iterator var and will be reused,
2562 so we must leave the magic. */
2563 else
2564 /* This sv could be returned by the assignment op, so clear the
2565 magic, as lvrefs are an implementation detail that must not be
2566 leaked to the user. */
2567 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2568 return 0;
2569}
2570
2571int
864dbfa3 2572Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2573{
20b7effb 2574#ifdef USE_ITHREADS
97aff369 2575 dVAR;
20b7effb 2576#endif
eb578fdb
KW
2577 const char *s;
2578 I32 paren;
2579 const REGEXP * rx;
79072805 2580 I32 i;
8990e307 2581 STRLEN len;
125b9982 2582 MAGIC *tmg;
2fdbfb4d 2583
7918f24d
NC
2584 PERL_ARGS_ASSERT_MAGIC_SET;
2585
e91d8259 2586 if (!mg->mg_ptr) {
960b831f 2587 paren = mg->mg_len;
1e05feb3 2588 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2589 setparen_got_rx:
2fdbfb4d 2590 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2591 } else {
2fdbfb4d
AB
2592 /* Croak with a READONLY error when a numbered match var is
2593 * set without a previous pattern match. Unless it's C<local $1>
2594 */
e91d8259 2595 croakparen:
2fdbfb4d 2596 if (!PL_localizing) {
cb077ed2 2597 Perl_croak_no_modify();
2fdbfb4d
AB
2598 }
2599 }
e91d8259
NC
2600 return 0;
2601 }
2602
2603 switch (*mg->mg_ptr) {
748a9306 2604 case '\001': /* ^A */
f2da823f
FC
2605 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2606 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2607 FmLINES(PL_bodytarget) = 0;
2608 if (SvPOK(PL_bodytarget)) {
2609 char *s = SvPVX(PL_bodytarget);
2610 while ( ((s = strchr(s, '\n'))) ) {
2611 FmLINES(PL_bodytarget)++;
2612 s++;
2613 }
2614 }
125b9982 2615 /* mg_set() has temporarily made sv non-magical */
284167a5 2616 if (TAINTING_get) {
125b9982
NT
2617 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2618 SvTAINTED_on(PL_bodytarget);
2619 else
2620 SvTAINTED_off(PL_bodytarget);
2621 }
748a9306 2622 break;
49460fe6 2623 case '\003': /* ^C */
f2338a2e 2624 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2625 break;
2626
79072805 2627 case '\004': /* ^D */
b4ab917c 2628#ifdef DEBUGGING
b83604b4 2629 s = SvPV_nolen_const(sv);
ddcf8bc1 2630 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2631 if (DEBUG_x_TEST || DEBUG_B_TEST)
2632 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2633#else
38ab35f8 2634 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2635#endif
79072805 2636 break;
28f23441 2637 case '\005': /* ^E */
d0063567 2638 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2639#ifdef VMS
38ab35f8 2640 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2641#else
2642# ifdef WIN32
d0063567 2643 SetLastError( SvIV(sv) );
e37778c2
NC
2644# else
2645# ifdef OS2
38ab35f8 2646 os2_setsyserrno(SvIV(sv));
e37778c2 2647# else
d0063567 2648 /* will anyone ever use this? */
38ab35f8 2649 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2650# endif
2651# endif
22fae026 2652#endif
d0063567 2653 }
3e669301
KW
2654 else {
2655 unsigned int offset = 1;
2656 bool lex = FALSE;
2657
2658 /* It may be the shadow variable ${E_NCODING} which has lexical
2659 * scope. See comments at Perl__get_encoding in this file */
2660 if (*(mg->mg_ptr + 1) == '_') {
199670db
FC
2661 if (CopSTASH(PL_curcop) != get_hv("encoding::",0))
2662 Perl_croak_no_modify();
3e669301
KW
2663 lex = TRUE;
2664 offset++;
2665 }
2666 if (strEQ(mg->mg_ptr + offset, "NCODING")) {
2667 if (lex) { /* Use the shadow global */
2668 SvREFCNT_dec(PL_lex_encoding);
2669 if (SvOK(sv) || SvGMAGICAL(sv)) {
2670 PL_lex_encoding = newSVsv(sv);
2671 }
2672 else {
2673 PL_lex_encoding = NULL;
2674 }
2675 }
2676 else { /* Use the regular global */
050e2cbf
KW
2677 SvREFCNT_dec(PL_encoding);
2678 if (SvOK(sv) || SvGMAGICAL(sv)) {
d5b4785c
DIM
2679 if (PL_localizing != 2) {
2680 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2681 "Setting ${^ENCODING} is deprecated");
2682 }
050e2cbf
KW
2683 PL_encoding = newSVsv(sv);
2684 }
2685 else {
2686 PL_encoding = NULL;
2687 }
2688 }
3e669301
KW
2689 }
2690 }
d0063567 2691 break;
79072805 2692 case '\006': /* ^F */
38ab35f8 2693 PL_maxsysfd = SvIV(sv);
79072805 2694 break;
a0d0e21e 2695 case '\010': /* ^H */
38ab35f8 2696 PL_hints = SvIV(sv);
a0d0e21e 2697 break;
9d116dd7 2698 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2699 Safefree(PL_inplace);
bd61b366 2700 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2701 break;
d9bad346
FC
2702 case '\016': /* ^N */
2703 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2704 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2705 goto croakparen;
28f23441 2706 case '\017': /* ^O */
ac27b0f5 2707 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2708 Safefree(PL_osname);
bd61b366 2709 PL_osname = NULL;
3511154c
DM
2710 if (SvOK(sv)) {
2711 TAINT_PROPER("assigning to $^O");
2e0de35c 2712 PL_osname = savesvpv(sv);
3511154c 2713 }
ac27b0f5
NIS
2714 }
2715 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2716 STRLEN len;
2717 const char *const start = SvPV(sv, len);
b54fc2b6 2718 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2719 SV *tmp;
8b850bd5
NC
2720
2721
2722 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2723 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2724
2725 /* Opening for input is more common than opening for output, so
2726 ensure that hints for input are sooner on linked list. */
59cd0e26 2727 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2728 SvUTF8(sv))
2729 : newSVpvs_flags("", SvUTF8(sv));
2730 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2731 mg_set(tmp);
8b850bd5 2732
f747ebd6
Z
2733 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2734 SvUTF8(sv));
2735 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2736 mg_set(tmp);
ac27b0f5 2737 }
28f23441 2738 break;
79072805 2739 case '\020': /* ^P */
2fdbfb4d
AB
2740 PL_perldb = SvIV(sv);
2741 if (PL_perldb && !PL_DBsingle)
2742 init_debugger();
9b9e0be4 2743 break;
79072805 2744 case '\024': /* ^T */
88e89b8a 2745#ifdef BIG_TIME
6b88bc9c 2746 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2747#else
38ab35f8 2748 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2749#endif
79072805 2750 break;
e07ea26a
NC
2751 case '\025': /* ^UTF8CACHE */
2752 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2753 PL_utf8cache = (signed char) sv_2iv(sv);
2754 }
2755 break;
fde18df1 2756 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2757 if (*(mg->mg_ptr+1) == '\0') {
2758 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2759 i = SvIV(sv);
ac27b0f5 2760 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2761 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2762 }
599cee73 2763 }
0a378802 2764 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2765 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2766 if (!SvPOK(sv)) {
2767 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2768 break;
2769 }
f4fc7782 2770 {
b5477537 2771 STRLEN len, i;
d3a7d8c7 2772 int accumulate = 0 ;
f4fc7782 2773 int any_fatals = 0 ;
b83604b4 2774 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2775 for (i = 0 ; i < len ; ++i) {
2776 accumulate |= ptr[i] ;
2777 any_fatals |= (ptr[i] & 0xAA) ;
2778 }
4243c432
NC
2779 if (!accumulate) {
2780 if (!specialWARN(PL_compiling.cop_warnings))
2781 PerlMemShared_free(PL_compiling.cop_warnings);
2782 PL_compiling.cop_warnings = pWARN_NONE;
2783 }
3c3f8cd6
AB
2784 /* Yuck. I can't see how to abstract this: */
2785 else if (isWARN_on(
2786 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2787 WARN_ALL)
2788 && !any_fatals)
2789 {
2790 if (!specialWARN(PL_compiling.cop_warnings))
2791 PerlMemShared_free(PL_compiling.cop_warnings);
2792 PL_compiling.cop_warnings = pWARN_ALL;
2793 PL_dowarn |= G_WARN_ONCE ;
2794 }
d3a7d8c7 2795 else {
72dc9ed5
NC
2796 STRLEN len;
2797 const char *const p = SvPV_const(sv, len);
2798
2799 PL_compiling.cop_warnings
8ee4cf24 2800 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2801 p, len);
2802
d3a7d8c7
GS
2803 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2804 PL_dowarn |= G_WARN_ONCE ;
2805 }
f4fc7782 2806
d3a7d8c7 2807 }
4438c4b7 2808 }
971a9dd3 2809 }
8ca2a5d6
DD
2810#ifdef WIN32
2811 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2812 w32_sloppystat = (bool)sv_true(sv);
2813 }
2814#endif
79072805
LW
2815 break;
2816 case '.':
3280af22
NIS
2817 if (PL_localizing) {
2818 if (PL_localizing == 1)
7766f137 2819 SAVESPTR(PL_last_in_gv);
748a9306 2820 }
3280af22 2821 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2822 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2823 break;
2824 case '^':
acbe1b9d
FC
2825 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2826 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2827 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2828 break;
2829 case '~':
acbe1b9d
FC
2830 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2831 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2832 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2833 break;
2834 case '=':
acbe1b9d 2835 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2836 break;
2837 case '-':
acbe1b9d
FC
2838 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2839 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2840 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2841 break;
2842 case '%':
acbe1b9d 2843 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2844 break;
2845 case '|':
4b65379b 2846 {
099be4f1 2847 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2848 if(!io)
2849 break;
38ab35f8 2850 if ((SvIV(sv)) == 0)
4b65379b
CS
2851 IoFLAGS(io) &= ~IOf_FLUSH;
2852 else {
2853 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2854 PerlIO *ofp = IoOFP(io);
2855 if (ofp)
2856 (void)PerlIO_flush(ofp);
2857 IoFLAGS(io) |= IOf_FLUSH;
2858 }
2859 }
79072805
LW
2860 }
2861 break;
79072805 2862 case '/':
1ab48e3a
YO
2863 {
2864 SV *tmpsv= sv;
2865 if (SvROK(sv)) {
2866 SV *referent= SvRV(sv);
2867 const char *reftype= sv_reftype(referent, 0);
2868 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2869 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2870 * a full string comparison on the return of sv_reftype() both of which
2871 * make me feel worse! NOTE, do not modify this comment without reviewing the
2872 * corresponding comment in sv_reftype(). - Yves */
2873 if (reftype[0] == 'S' || reftype[0] == 'L') {
2874 IV val= SvIV(referent);
2875 if (val <= 0) {
2876 tmpsv= &PL_sv_undef;
ddc3d23f 2877 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1ab48e3a
YO
2878 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2879 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2880 );
2881 }
2882 } else {
ddce084a 2883 sv_setsv(sv, PL_rs);
ee0ba734 2884 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
2885 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2886 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
2887 }
2888 }
b3a2acfa 2889 SvREFCNT_dec(PL_rs);
1ab48e3a 2890 PL_rs = newSVsv(tmpsv);
b3a2acfa 2891 }
79072805
LW
2892 break;
2893 case '\\':
ef8d46e8 2894 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2895 if (SvOK(sv)) {
7889fe52 2896 PL_ors_sv = newSVsv(sv);
009c130f 2897 }
e3c19b7b 2898 else {
a0714e2c 2899 PL_ors_sv = NULL;
e3c19b7b 2900 }
79072805 2901 break;
7d69d4a6
FC
2902 case '[':
2903 if (SvIV(sv) != 0)
2904 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2905 break;
79072805 2906 case '?':
ff0cee69 2907#ifdef COMPLEX_STATUS
6b88bc9c 2908 if (PL_localizing == 2) {
41cb7b2b 2909 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2910 PL_statusvalue = LvTARGOFF(sv);
2911 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2912 }
2913 else
2914#endif
2915#ifdef VMSISH_STATUS
2916 if (VMSISH_STATUS)
fb38d079 2917 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2918 else
2919#endif
38ab35f8 2920 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2921 break;
2922 case '!':
93189314
JH
2923 {
2924#ifdef VMS
2925# define PERL_VMS_BANG vaxc$errno
2926#else
2927# define PERL_VMS_BANG 0
2928#endif
27329181 2929#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2930 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2931 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2932#else
91487cfc 2933 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2934 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2935#endif
93189314 2936 }
79072805
LW
2937 break;
2938 case '<':
985213f2 2939 {
b469f1e0 2940 /* XXX $< currently silently ignores failures */
dfff4baf 2941 const Uid_t new_uid = SvUID(sv);
985213f2 2942 PL_delaymagic_uid = new_uid;
3280af22
NIS
2943 if (PL_delaymagic) {
2944 PL_delaymagic |= DM_RUID;
79072805
LW
2945 break; /* don't do magic till later */
2946 }
2947#ifdef HAS_SETRUID
b469f1e0 2948 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW
2949#else
2950#ifdef HAS_SETREUID
b469f1e0 2951 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 2952#else
85e6fe83 2953#ifdef HAS_SETRESUID
b469f1e0 2954 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 2955#else
985213f2 2956 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2957#ifdef PERL_DARWIN
2958 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2959 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 2960 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 2961#endif
b469f1e0 2962 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 2963 } else {
cea2e8a9 2964 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2965 }
79072805
LW
2966#endif
2967#endif
85e6fe83 2968#endif
79072805 2969 break;
985213f2 2970 }
79072805 2971 case '>':
985213f2 2972 {
b469f1e0 2973 /* XXX $> currently silently ignores failures */
dfff4baf 2974 const Uid_t new_euid = SvUID(sv);
985213f2 2975 PL_delaymagic_euid = new_euid;
3280af22
NIS
2976 if (PL_delaymagic) {
2977 PL_delaymagic |= DM_EUID;
79072805
LW
2978 break; /* don't do magic till later */
2979 }
2980#ifdef HAS_SETEUID
b469f1e0 2981 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW
2982#else
2983#ifdef HAS_SETREUID
b469f1e0 2984 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW
2985#else
2986#ifdef HAS_SETRESUID
b469f1e0 2987 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 2988#else
985213f2 2989 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 2990 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 2991 else {
cea2e8a9 2992 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2993 }
79072805
LW
2994#endif
2995#endif
85e6fe83 2996#endif
79072805 2997 break;
985213f2 2998 }
79072805 2999 case '(':
985213f2 3000 {
b469f1e0 3001 /* XXX $( currently silently ignores failures */
dfff4baf 3002 const Gid_t new_gid = SvGID(sv);
985213f2 3003 PL_delaymagic_gid = new_gid;
3280af22
NIS
3004 if (PL_delaymagic) {
3005 PL_delaymagic |= DM_RGID;
79072805
LW
3006 break; /* don't do magic till later */
3007 }
3008#ifdef HAS_SETRGID
b469f1e0 3009 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW
3010#else
3011#ifdef HAS_SETREGID
b469f1e0 3012 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW
3013#else
3014#ifdef HAS_SETRESGID
b469f1e0 3015 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3016#else
985213f2 3017 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3018 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3019 else {
cea2e8a9 3020 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3021 }
79072805
LW
3022#endif
3023#endif
85e6fe83 3024#endif
79072805 3025 break;
985213f2 3026 }
79072805 3027 case ')':
985213f2 3028 {
0635704a
HS
3029/* (hv) best guess: maybe we'll need configure probes to do a better job,
3030 * but you can override it if you need to.
3031 */
3032#ifndef INVALID_GID
3033#define INVALID_GID ((Gid_t)-1)
3034#endif
b469f1e0 3035 /* XXX $) currently silently ignores failures */
dfff4baf 3036 Gid_t new_egid;
5cd24f17
PP
3037#ifdef HAS_SETGROUPS
3038 {
b83604b4 3039 const char *p = SvPV_const(sv, len);
757f63d8 3040 Groups_t *gary = NULL;
fdadaf77 3041 const char* endptr;
22ff3130 3042 UV uv;
fb4089e0 3043#ifdef _SC_NGROUPS_MAX
3044 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3045
3046 if (maxgrp < 0)
3047 maxgrp = NGROUPS;
3048#else
3049 int maxgrp = NGROUPS;
3050#endif
757f63d8
SP
3051
3052 while (isSPACE(*p))
3053 ++p;
22ff3130
HS
3054 if (grok_atoUV(p, &uv, &endptr))
3055 new_egid = (Gid_t)uv;
3056 else {
0635704a 3057 new_egid = INVALID_GID;
22ff3130
HS
3058 endptr = NULL;
3059 }
fb4089e0 3060 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3061 if (endptr == NULL)
3062 break;
3063 p = endptr;
757f63d8
SP
3064 while (isSPACE(*p))
3065 ++p;
3066 if (!*p)
3067 break;
fdadaf77 3068 if (!gary)
757f63d8
SP
3069 Newx(gary, i + 1, Groups_t);
3070 else
3071 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3072 if (grok_atoUV(p, &uv, &endptr))
3073 gary[i] = (Groups_t)uv;
3074 else {
0635704a 3075 gary[i] = INVALID_GID;
22ff3130
HS
3076 endptr = NULL;
3077 }
757f63d8
SP
3078 }
3079 if (i)
b469f1e0 3080 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3081 Safefree(gary);
5cd24f17
PP
3082 }
3083#else /* HAS_SETGROUPS */
dfff4baf 3084 new_egid = SvGID(sv);
5cd24f17 3085#endif /* HAS_SETGROUPS */
985213f2 3086 PL_delaymagic_egid = new_egid;
3280af22
NIS
3087 if (PL_delaymagic) {
3088 PL_delaymagic |= DM_EGID;
79072805
LW
3089 break; /* don't do magic till later */
3090 }
3091#ifdef HAS_SETEGID
b469f1e0 3092 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW
3093#else
3094#ifdef HAS_SETREGID
b469f1e0 3095 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW
3096#else
3097#ifdef HAS_SETRESGID
b469f1e0 3098 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3099#else
985213f2 3100 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3101 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3102 else {
cea2e8a9 3103 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3104 }
79072805
LW
3105#endif
3106#endif
85e6fe83 3107#endif
79072805 3108 break;
985213f2 3109 }
79072805 3110 case ':':
2d8e6c8d 3111 PL_chopset = SvPV_force(sv,len);
79072805 3112 break;
9cdac2a2
FC
3113 case '$': /* $$ */
3114 /* Store the pid in mg->mg_obj so we can tell when a fork has
3115 occurred. mg->mg_obj points to *$ by default, so clear it. */
3116 if (isGV(mg->mg_obj)) {
3117 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3118 SvREFCNT_dec(mg->mg_obj);
3119 mg->mg_flags |= MGf_REFCOUNTED;
3120 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3121 }
3122 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3123 break;
79072805 3124 case '0':
e2975953 3125 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
3126#ifdef HAS_SETPROCTITLE
3127 /* The BSDs don't show the argv[] in ps(1) output, they
3128 * show a string from the process struct and provide
3129 * the setproctitle() routine to manipulate that. */
a2722ac9 3130 if (PL_origalen != 1) {
b83604b4 3131 s = SvPV_const(sv, len);
98b76f99 3132# if __FreeBSD_version > 410001
9aad2c0e 3133 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
3134 * but not the "(perl) suffix from the ps(1)
3135 * output, because that's what ps(1) shows if the
3136 * argv[] is modified. */
6f2ad931 3137 setproctitle("-%s", s);
9aad2c0e 3138# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
3139 /* This doesn't really work if you assume that
3140 * $0 = 'foobar'; will wipe out 'perl' from the $0
3141 * because in ps(1) output the result will be like
3142 * sprintf("perl: %s (perl)", s)
3143 * I guess this is a security feature:
3144 * one (a user process) cannot get rid of the original name.
3145 * --jhi */
3146 setproctitle("%s", s);
3147# endif
3148 }
9d3968b2 3149#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 3150 if (PL_origalen != 1) {
17aa7f3d 3151 union pstun un;
b83604b4 3152 s = SvPV_const(sv, len);
6867be6d 3153 un.pst_command = (char *)s;
17aa7f3d
JH
3154 pstat(PSTAT_SETCMD, un, len, 0, 0);
3155 }
9d3968b2 3156#else
2d2af554
GA
3157 if (PL_origalen > 1) {
3158 /* PL_origalen is set in perl_parse(). */
3159 s = SvPV_force(sv,len);
3160 if (len >= (STRLEN)PL_origalen-1) {
3161 /* Longer than original, will be truncated. We assume that
3162 * PL_origalen bytes are available. */
3163 Copy(s, PL_origargv[0], PL_origalen-1, char);
3164 }
3165 else {
3166 /* Shorter than original, will be padded. */
235ac35d 3167#ifdef PERL_DARWIN
60777a0d
JH
3168 /* Special case for Mac OS X: see [perl #38868] */
3169 const int pad = 0;
235ac35d 3170#else
8a89a4f1
MB
3171 /* Is the space counterintuitive? Yes.
3172 * (You were expecting \0?)
3173 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3174 * --jhi */
60777a0d 3175 const int pad = ' ';
235ac35d 3176#endif
60777a0d
JH
3177 Copy(s, PL_origargv[0], len, char);
3178 PL_origargv[0][len] = 0;
3179 memset(PL_origargv[0] + len + 1,
3180 pad, PL_origalen - len - 1);
2d2af554
GA
3181 }
3182 PL_origargv[0][PL_origalen-1] = 0;
3183 for (i = 1; i < PL_origargc; i++)
3184 PL_origargv[i] = 0;
7636ea95
AB
3185#ifdef HAS_PRCTL_SET_NAME
3186 /* Set the legacy process name in addition to the POSIX name on Linux */
3187 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3188 /* diag_listed_as: SKIPME */
3189 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3190 }
3191#endif
79072805 3192 }
9d3968b2 3193#endif
e2975953 3194 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3195 break;
3196 }
3197 return 0;
3198}
3199
3200I32
84c7b88c
BF
3201Perl_whichsig_sv(pTHX_ SV *sigsv)
3202{
3203 const char *sigpv;
3204 STRLEN siglen;
3205 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3206 sigpv = SvPV_const(sigsv, siglen);
3207 return whichsig_pvn(sigpv, siglen);
3208}
3209
3210I32
3211Perl_whichsig_pv(pTHX_ const char *sig)
3212{
3213 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3214 return whichsig_pvn(sig, strlen(sig));
3215}
3216
3217I32
3218Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3219{
eb578fdb 3220 char* const* sigv;
7918f24d 3221
84c7b88c 3222 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3223 PERL_UNUSED_CONTEXT;
79072805 3224
aadb217d 3225 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3226 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3227 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3228#ifdef SIGCLD
84c7b88c 3229 if (memEQs(sig, len, "CHLD"))
79072805
LW
3230 return SIGCLD;
3231#endif
3232#ifdef SIGCHLD
84c7b88c 3233 if (memEQs(sig, len, "CLD"))
79072805
LW
3234 return SIGCHLD;
3235#endif
7f1236c0 3236 return -1;
79072805
LW
3237}
3238
ecfc5424 3239Signal_t
1e82f5a6 3240#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3241Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3242#else
3243Perl_sighandler(int sig)
3244#endif
79072805 3245{
1018e26f
NIS
3246#ifdef PERL_GET_SIG_CONTEXT
3247 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3248#else
cea2e8a9 3249 dTHX;
71d280e3 3250#endif
79072805 3251 dSP;
a0714e2c
SS
3252 GV *gv = NULL;
3253 SV *sv = NULL;
8772537c 3254 SV * const tSv = PL_Sv;
601f1833 3255 CV *cv = NULL;
533c011a 3256 OP *myop = PL_op;
84902520 3257 U32 flags = 0;
8772537c 3258 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3259 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3260 SV *errsv_save = NULL;
71d280e3 3261
84902520 3262
727405f8 3263 if (!PL_psig_ptr[sig]) {
99ef548b 3264 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3265 PL_sig_name[sig]);
3266 exit(sig);
3267 }
ff0cee69 3268
a0d63a7b
DM
3269 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3270 /* Max number of items pushed there is 3*n or 4. We cannot fix
3271 infinity, so we fix 4 (in fact 5): */
3272 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3273 flags |= 1;
3274 PL_savestack_ix += 5; /* Protect save in progress. */
3275 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3276 }
84902520 3277 }
84902520 3278 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3279 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3280 || SvTYPE(cv) != SVt_PVCV) {
3281 HV *st;
f2c0649b 3282 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3283 }
84902520 3284
a0d0e21e 3285 if (!cv || !CvROOT(cv)) {
07c325bb 3286 const HEK * const hek = gv
1d6bb9ae
FC
3287 ? GvENAME_HEK(gv)
3288 : cv && CvNAMED(cv)
3289 ? CvNAME_HEK(cv)
07c325bb
FC
3290 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3291 if (hek)
3292 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3293 "SIG%s handler \"%"HEKf"\" not defined.\n",
ac892e4a 3294 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3295 /* diag_listed_as: SIG%s handler "%s" not defined */
3296 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3297 "SIG%s handler \"__ANON__\" not defined.\n",
3298 PL_sig_name[sig]);
00d579c5 3299 goto cleanup;
79072805
LW
3300 }
3301
0c4d3b5e
DM
3302 sv = PL_psig_name[sig]
3303 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3304 : newSVpv(PL_sig_name[sig],0);
72048cfe 3305 flags |= 8;
0c4d3b5e
DM
3306 SAVEFREESV(sv);
3307
a0d63a7b
DM
3308 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3309 /* make sure our assumption about the size of the SAVEs are correct:
3310 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3311 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3312 }
e336de0d 3313
e788e7d3 3314 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3315 PUSHMARK(SP);
79072805 3316 PUSHs(sv);
8aad04aa
JH
3317#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3318 {
3319 struct sigaction oact;
3320
3321 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3322 if (sip) {
3323 HV *sih = newHV();
ad64d0ec 3324 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3325 /* The siginfo fields signo, code, errno, pid, uid,
3326 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3327 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3328 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3329#if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */
85771703
NC
3330 hv_stores(sih, "errno", newSViv(sip->si_errno));
3331 hv_stores(sih, "status", newSViv(sip->si_status));
3332 hv_stores(sih, "uid", newSViv(sip->si_uid));
3333 hv_stores(sih, "pid", newSViv(sip->si_pid));
3334 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3335 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3336#endif
8aad04aa 3337 EXTEND(SP, 2);
ad64d0ec 3338 PUSHs(rv);
22f1178f 3339 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3340 }
b4552a27 3341
8aad04aa
JH
3342 }
3343 }
3344#endif
79072805 3345 PUTBACK;
a0d0e21e 3346
100c03aa
JL
3347 errsv_save = newSVsv(ERRSV);
3348
ad64d0ec 3349 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3350
d3acc0f7 3351 POPSTACK;
eed484f9
DD
3352 {
3353 SV * const errsv = ERRSV;
3354 if (SvTRUE_NN(errsv)) {
3355 SvREFCNT_dec(errsv_save);
c22d665b 3356#ifndef PERL_MICRO
1b266415
NIS
3357 /* Handler "died", for example to get out of a restart-able read().
3358 * Before we re-do that on its behalf re-enable the signal which was
3359 * blocked by the system when we entered.
3360 */
c22d665b 3361#ifdef HAS_SIGPROCMASK
d488af49 3362#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3363 if (sip || uap)
c22d665b 3364#endif
eed484f9
DD
3365 {
3366 sigset_t set;
3367 sigemptyset(&set);
3368 sigaddset(&set,sig);
3369 sigprocmask(SIG_UNBLOCK, &set, NULL);
3370 }
c22d665b 3371#else
eed484f9
DD
3372 /* Not clear if this will work */
3373 (void)rsignal(sig, SIG_IGN);
3374 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3375#endif
3376#endif /* !PERL_MICRO */
eed484f9
DD
3377 die_sv(errsv);
3378 }
3379 else {
3380 sv_setsv(errsv, errsv_save);
3381 SvREFCNT_dec(errsv_save);
3382 }
100c03aa
JL
3383 }
3384
7b52d656 3385 cleanup:
0c4d3b5e
DM
3386 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3387 PL_savestack_ix = old_ss_ix;
72048cfe 3388 if (flags & 8)
2357bae7 3389 SvREFCNT_dec_NN(sv);
533c011a 3390 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3391
3280af22
NIS
3392 PL_Sv = tSv; /* Restore global temporaries. */
3393 PL_Xpv = tXpv;
53bb94e2 3394 return;
79072805 3395}
4e35701f
NIS
3396
3397
51371543 3398static void
8772537c 3399S_restore_magic(pTHX_ const void *p)
51371543 3400{
8772537c
AL
3401 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3402 SV* const sv = mgs->mgs_sv;
150b625d 3403 bool bumped;
51371543
GS
3404
3405 if (!sv)
3406 return;
3407
4bac9ae4
CS
3408 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3409 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
a623f893
FC
3410 if (mgs->mgs_flags)
3411 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS
3412 else
3413 mg_magical(sv);
51371543
GS
3414 }
3415
150b625d 3416 bumped = mgs->mgs_bumped;
51371543
GS
3417 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3418
3419 /* If we're still on top of the stack, pop us off. (That condition
3420 * will be satisfied if restore_magic was called explicitly, but *not*
3421 * if it's being called via leave_scope.)
3422 * The reason for doing this is that otherwise, things like sv_2cv()
3423 * may leave alloc gunk on the savestack, and some code
3424 * (e.g. sighandler) doesn't expect that...
3425 */
3426 if (PL_savestack_ix == mgs->mgs_ss_ix)
3427 {
1be36ce0
NC
3428 UV popval = SSPOPUV;
3429 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3430 PL_savestack_ix -= 2;
1be36ce0
NC
3431 popval = SSPOPUV;
3432 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3433 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3434 }
150b625d
DM
3435 if (bumped) {
3436 if (SvREFCNT(sv) == 1) {
3437 /* We hold the last reference to this SV, which implies that the
3438 SV was deleted as a side effect of the routines we called.
3439 So artificially keep it alive a bit longer.
3440 We avoid turning on the TEMP flag, which can cause the SV's
3441 buffer to get stolen (and maybe other stuff). */
150b625d 3442 sv_2mortal(sv);
4bac9ae4 3443 SvTEMP_off(sv);
8985fe98 3444 }
150b625d 3445 else
2357bae7 3446 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3447 }
51371543
GS
3448}
3449
0c4d3b5e
DM
3450/* clean up the mess created by Perl_sighandler().
3451 * Note that this is only called during an exit in a signal handler;
3452 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3453 * skipped over. */
0c4d3b5e 3454
51371543 3455static void
8772537c 3456S_unwind_handler_stack(pTHX_ const void *p)
51371543 3457{
0c4d3b5e 3458 PERL_UNUSED_ARG(p);
7918f24d 3459
0c4d3b5e 3460 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3461}
1018e26f 3462
66610fdd 3463/*
b3ca2e83
NC
3464=for apidoc magic_sethint
3465
796b6530 3466Triggered by a store to C<%^H>, records the key/value pair to
c28fe1ec
NC
3467C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing