This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Fix HP-UX $! failure
[perl5.git] / mg.c
CommitLineData
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
21"Magic" is special data attached to SV structures in order to give them
22"magical" properties. When any Perl code tries to read from, or assign to,
23an SV marked as magical, it calls the 'get' or 'set' function associated
24with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 25give it a chance to update its internal value (get on $. writes the line
166f8a29
DM
26number of the last read filehandle into to the SV's IV slot), while
27set is called after an SV has been written to, in order to allow it to make
ddfa107c 28use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
29PL_rs global variable).
30
31Magic is implemented as a linked list of MAGIC structures attached to the
32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33of functions that implement the get(), set(), length() etc functions,
34plus space for some flags and pointers. For example, a tied variable has
35a MAGIC structure that contains a pointer to the object associated with the
36tie.
37
ccfc67b7
JH
38*/
39
79072805 40#include "EXTERN.h"
864dbfa3 41#define PERL_IN_MG_C
79072805
LW
42#include "perl.h"
43
5cd24f17 44#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
45# ifdef I_GRP
46# include <grp.h>
47# endif
188ea221
CS
48#endif
49
757f63d8
SP
50#if defined(HAS_SETGROUPS)
51# ifndef NGROUPS
52# define NGROUPS 32
53# endif
54#endif
55
17aa7f3d
JH
56#ifdef __hpux
57# include <sys/pstat.h>
58#endif
59
7636ea95
AB
60#ifdef HAS_PRCTL_SET_NAME
61# include <sys/prctl.h>
62#endif
63
8aad04aa 64#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 65Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 66#else
e69880a5 67Signal_t Perl_csighandler(int sig);
8aad04aa 68#endif
e69880a5 69
9cffb111
OS
70#ifdef __Lynx__
71/* Missing protos on LynxOS */
72void setruid(uid_t id);
73void seteuid(uid_t id);
74void setrgid(uid_t id);
75void setegid(uid_t id);
76#endif
77
c07a80fd 78/*
4bac9ae4 79 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
80 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
81 */
82
83struct magic_state {
84 SV* mgs_sv;
455ece5e 85 I32 mgs_ss_ix;
f9c6fee5
CS
86 U32 mgs_magical;
87 bool mgs_readonly;
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{
97aff369 95 dVAR;
455ece5e 96 MGS* mgs;
150b625d 97 bool bumped = FALSE;
7918f24d 98
ff44333e 99 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 100
4bac9ae4
CS
101 assert(SvMAGICAL(sv));
102
150b625d
DM
103 /* we shouldn't really be called here with RC==0, but it can sometimes
104 * happen via mg_clear() (which also shouldn't be called when RC==0,
105 * but it can happen). Handle this case gracefully(ish) by not RC++
106 * and thus avoiding the resultant double free */
107 if (SvREFCNT(sv) > 0) {
108 /* guard against sv getting freed midway through the mg clearing,
109 * by holding a private reference for the duration. */
110 SvREFCNT_inc_simple_void_NN(sv);
111 bumped = TRUE;
112 }
8985fe98 113
8772537c 114 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
115
116 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 117 mgs->mgs_sv = sv;
f9c6fee5 118 mgs->mgs_magical = SvMAGICAL(sv);
46959f1c 119 mgs->mgs_readonly = SvREADONLY(sv) != 0;
455ece5e 120 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 121 mgs->mgs_bumped = bumped;
c07a80fd 122
ff44333e 123 SvFLAGS(sv) &= ~flags;
3805b5fb 124 SvREADONLY_off(sv);
c07a80fd
PP
125}
126
ff44333e
FC
127#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
128
954c1994
GS
129/*
130=for apidoc mg_magical
131
132Turns on the magical status of an SV. See C<sv_magic>.
133
134=cut
135*/
136
8990e307 137void
864dbfa3 138Perl_mg_magical(pTHX_ SV *sv)
8990e307 139{
e1ec3a88 140 const MAGIC* mg;
7918f24d 141 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 142 PERL_UNUSED_CONTEXT;
f9c6fee5
CS
143
144 SvMAGICAL_off(sv);
218787bd 145 if ((mg = SvMAGIC(sv))) {
218787bd
VP
146 do {
147 const MGVTBL* const vtbl = mg->mg_virtual;
148 if (vtbl) {
149 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
150 SvGMAGICAL_on(sv);
151 if (vtbl->svt_set)
152 SvSMAGICAL_on(sv);
153 if (vtbl->svt_clear)
154 SvRMAGICAL_on(sv);
155 }
156 } while ((mg = mg->mg_moremagic));
157 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
158 SvRMAGICAL_on(sv);
8990e307
LW
159 }
160}
161
954c1994
GS
162/*
163=for apidoc mg_get
164
4b1e7f06
DD
165Do magic before a value is retrieved from the SV. The type of SV must
166be >= SVt_PVMG. See C<sv_magic>.
954c1994
GS
167
168=cut
169*/
170
79072805 171int
864dbfa3 172Perl_mg_get(pTHX_ SV *sv)
79072805 173{
97aff369 174 dVAR;
35a4481c 175 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 176 bool saved = FALSE;
f9c6fee5 177 bool have_new = 0;
ff76feab 178 MAGIC *newmg, *head, *cur, *mg;
6683b158 179
7918f24d
NC
180 PERL_ARGS_ASSERT_MG_GET;
181
407287f9
FC
182 if (PL_localizing == 1 && sv == DEFSV) return 0;
183
ff76feab
AMS
184 /* We must call svt_get(sv, mg) for each valid entry in the linked
185 list of magic. svt_get() may delete the current entry, add new
186 magic to the head of the list, or upgrade the SV. AMS 20010810 */
187
188 newmg = cur = head = mg = SvMAGIC(sv);
189 while (mg) {
35a4481c 190 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 191 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 192
2b260de0 193 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
194
195 /* taint's mg get is so dumb it doesn't need flag saving */
196 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
197 save_magic(mgs_ix, sv);
198 saved = TRUE;
199 }
200
16c91539 201 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 202
58f82c5c
DM
203 /* guard against magic having been deleted - eg FETCH calling
204 * untie */
f9c6fee5
CS
205 if (!SvMAGIC(sv)) {
206 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
58f82c5c 207 break;
f9c6fee5 208 }
b77f7d40 209
f9c6fee5 210 /* recalculate flags if this entry was deleted. */
ff76feab 211 if (mg->mg_flags & MGf_GSKIP)
f9c6fee5 212 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
a0d0e21e 213 }
7d1328bb
FC
214 else if (vtbl == &PL_vtbl_utf8) {
215 /* get-magic can reallocate the PV */
216 magic_setutf8(sv, mg);
217 }
ff76feab 218
f9c6fee5 219 mg = nextmg;
ff76feab 220
0723351e 221 if (have_new) {
ff76feab
AMS
222 /* Have we finished with the new entries we saw? Start again
223 where we left off (unless there are more new entries). */
224 if (mg == head) {
0723351e 225 have_new = 0;
ff76feab
AMS
226 mg = cur;
227 head = newmg;
228 }
229 }
230
231 /* Were any new entries added? */
0723351e
NC
232 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
233 have_new = 1;
ff76feab
AMS
234 cur = mg;
235 mg = newmg;
f9c6fee5 236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
760ac839 237 }
79072805 238 }
463ee0b2 239
a9844598
CS
240 if (saved)
241 restore_magic(INT2PTR(void *, (IV)mgs_ix));
242
79072805
LW
243 return 0;
244}
245
954c1994
GS
246/*
247=for apidoc mg_set
248
249Do magic after a value is assigned to the SV. See C<sv_magic>.
250
251=cut
252*/
253
79072805 254int
864dbfa3 255Perl_mg_set(pTHX_ SV *sv)
79072805 256{
97aff369 257 dVAR;
35a4481c 258 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 259 MAGIC* mg;
463ee0b2
LW
260 MAGIC* nextmg;
261
7918f24d
NC
262 PERL_ARGS_ASSERT_MG_SET;
263
b5ed8c44
FC
264 if (PL_localizing == 2 && sv == DEFSV) return 0;
265
ff44333e 266 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
267
268 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 269 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 270 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
271 if (mg->mg_flags & MGf_GSKIP) {
272 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
f9c6fee5 273 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
a0d0e21e 274 }
e0a73de4 275 if (PL_localizing == 2
b5ed8c44 276 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 277 continue;
2b260de0 278 if (vtbl && vtbl->svt_set)
16c91539 279 vtbl->svt_set(aTHX_ sv, mg);
79072805 280 }
463ee0b2 281
8772537c 282 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
283 return 0;
284}
285
954c1994
GS
286/*
287=for apidoc mg_length
288
d4e99c76 289Reports on the SV's length in bytes, calling length magic if available,
bd8446cf
FC
290but does not set the UTF8 flag on the sv. It will fall back to 'get'
291magic if there is no 'length' magic, but with no indication as to
292whether it called 'get' magic. It assumes the sv is a PVMG or
293higher. Use sv_len() instead.
954c1994
GS
294
295=cut
296*/
297
79072805 298U32
864dbfa3 299Perl_mg_length(pTHX_ SV *sv)
79072805 300{
97aff369 301 dVAR;
79072805 302 MAGIC* mg;
463ee0b2 303 STRLEN len;
463ee0b2 304
7918f24d
NC
305 PERL_ARGS_ASSERT_MG_LENGTH;
306
79072805 307 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 308 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 309 if (vtbl && vtbl->svt_len) {
35a4481c 310 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 311 save_magic(mgs_ix, sv);
a0d0e21e 312 /* omit MGf_GSKIP -- not changed here */
16c91539 313 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 314 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
315 return len;
316 }
317 }
318
bd8446cf 319 (void)SvPV_const(sv, len);
463ee0b2 320 return len;
79072805
LW
321}
322
8fb26106 323I32
864dbfa3 324Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
325{
326 MAGIC* mg;
ac27b0f5 327
7918f24d
NC
328 PERL_ARGS_ASSERT_MG_SIZE;
329
93965878 330 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 331 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 332 if (vtbl && vtbl->svt_len) {
35a4481c
AL
333 const I32 mgs_ix = SSNEW(sizeof(MGS));
334 I32 len;
455ece5e 335 save_magic(mgs_ix, sv);
93965878 336 /* omit MGf_GSKIP -- not changed here */
16c91539 337 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 338 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
339 return len;
340 }
341 }
342
343 switch(SvTYPE(sv)) {
344 case SVt_PVAV:
502c6561 345 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
346 case SVt_PVHV:
347 /* FIXME */
348 default:
cea2e8a9 349 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS
350 break;
351 }
352 return 0;
353}
354
954c1994
GS
355/*
356=for apidoc mg_clear
357
358Clear something magical that the SV represents. See C<sv_magic>.
359
360=cut
361*/
362
79072805 363int
864dbfa3 364Perl_mg_clear(pTHX_ SV *sv)
79072805 365{
35a4481c 366 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 367 MAGIC* mg;
8ac77ac9 368 MAGIC *nextmg;
463ee0b2 369
7918f24d
NC
370 PERL_ARGS_ASSERT_MG_CLEAR;
371
455ece5e 372 save_magic(mgs_ix, sv);
463ee0b2 373
8ac77ac9 374 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 375 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 376 /* omit GSKIP -- never set here */
727405f8 377
8ac77ac9
NC
378 nextmg = mg->mg_moremagic; /* it may delete itself */
379
2b260de0 380 if (vtbl && vtbl->svt_clear)
16c91539 381 vtbl->svt_clear(aTHX_ sv, mg);
79072805 382 }
463ee0b2 383
8772537c 384 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
385 return 0;
386}
387
ed624ca8 388static MAGIC*
39de7f53
FR
389S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
390{
391 PERL_UNUSED_CONTEXT;
392
393 assert(flags <= 1);
394
395 if (sv) {
396 MAGIC *mg;
397
7db6405c
FC
398 assert(!(SvTYPE(sv) == SVt_PVAV && AvPAD_NAMELIST(sv)));
399
39de7f53
FR
400 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
401 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
402 return mg;
403 }
404 }
405 }
406
407 return NULL;
408}
409
954c1994
GS
410/*
411=for apidoc mg_find
412
413Finds the magic pointer for type matching the SV. See C<sv_magic>.
414
415=cut
416*/
417
93a17b20 418MAGIC*
35a4481c 419Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 420{
39de7f53
FR
421 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
422}
423
424/*
425=for apidoc mg_findext
426
427Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
428C<sv_magicext>.
429
430=cut
431*/
432
433MAGIC*
434Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
435{
436 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
93a17b20
LW
437}
438
96c2a8ff
FC
439MAGIC *
440Perl_mg_find_mglob(pTHX_ SV *sv)
441{
442 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
443 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
444 /* This sv is only a delegate. //g magic must be attached to
445 its target. */
446 vivify_defelem(sv);
447 sv = LvTARG(sv);
448 }
449 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
450 return S_mg_findext_flags(aTHX_ sv, PERL_MAGIC_regex_global, 0, 0);
451 return NULL;
452}
453
954c1994
GS
454/*
455=for apidoc mg_copy
456
457Copies the magic from one SV to another. See C<sv_magic>.
458
459=cut
460*/
461
79072805 462int
864dbfa3 463Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 464{
463ee0b2 465 int count = 0;
79072805 466 MAGIC* mg;
7918f24d
NC
467
468 PERL_ARGS_ASSERT_MG_COPY;
469
463ee0b2 470 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 471 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 472 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 473 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 474 }
823a54a3
AL
475 else {
476 const char type = mg->mg_type;
1e73acc8 477 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
478 sv_magic(nsv,
479 (type == PERL_MAGIC_tied)
480 ? SvTIED_obj(sv, mg)
481 : (type == PERL_MAGIC_regdata && mg->mg_obj)
482 ? sv
483 : mg->mg_obj,
484 toLOWER(type), key, klen);
485 count++;
486 }
79072805 487 }
79072805 488 }
463ee0b2 489 return count;
79072805
LW
490}
491
954c1994 492/*
0cbee0a4
DM
493=for apidoc mg_localize
494
9711599e
CS
495Copy some of the magic from an existing SV to new localized version of that
496SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
497taint, pos).
498
af7df257 499If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
500This typically means that assignment will soon follow (e.g. 'local $x = $y'),
501and that will handle the magic.
0cbee0a4
DM
502
503=cut
504*/
505
506void
af7df257 507Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 508{
97aff369 509 dVAR;
0cbee0a4 510 MAGIC *mg;
7918f24d
NC
511
512 PERL_ARGS_ASSERT_MG_LOCALIZE;
513
658a9f31
JD
514 if (nsv == DEFSV)
515 return;
516
0cbee0a4 517 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 518 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 519 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 520 continue;
0cbee0a4 521
a5063e7c 522 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 523 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 524 else
0cbee0a4
DM
525 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
526 mg->mg_ptr, mg->mg_len);
a5063e7c 527
0cbee0a4 528 /* container types should remain read-only across localization */
9ff3e6d8 529 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
530 }
531
532 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
533 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 534 if (setmagic) {
9711599e
CS
535 PL_localizing = 1;
536 SvSETMAGIC(nsv);
537 PL_localizing = 0;
538 }
0cbee0a4
DM
539 }
540}
541
d9088386
Z
542#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
543static void
544S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
545{
546 const MGVTBL* const vtbl = mg->mg_virtual;
547 if (vtbl && vtbl->svt_free)
548 vtbl->svt_free(aTHX_ sv, mg);
549 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
550 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
551 Safefree(mg->mg_ptr);
552 else if (mg->mg_len == HEf_SVKEY)
553 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
554 }
555 if (mg->mg_flags & MGf_REFCOUNTED)
556 SvREFCNT_dec(mg->mg_obj);
557 Safefree(mg);
558}
559
0cbee0a4 560/*
954c1994
GS
561=for apidoc mg_free
562
563Free any magic storage used by the SV. See C<sv_magic>.
564
565=cut
566*/
567
79072805 568int
864dbfa3 569Perl_mg_free(pTHX_ SV *sv)
79072805
LW
570{
571 MAGIC* mg;
572 MAGIC* moremagic;
7918f24d
NC
573
574 PERL_ARGS_ASSERT_MG_FREE;
575
79072805 576 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 577 moremagic = mg->mg_moremagic;
d9088386 578 mg_free_struct(sv, mg);
c826f41b 579 SvMAGIC_set(sv, moremagic);
79072805 580 }
b162af07 581 SvMAGIC_set(sv, NULL);
68f8932e 582 SvMAGICAL_off(sv);
79072805
LW
583 return 0;
584}
585
d9088386
Z
586/*
587=for apidoc Am|void|mg_free_type|SV *sv|int how
588
589Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
590
591=cut
592*/
593
594void
595Perl_mg_free_type(pTHX_ SV *sv, int how)
596{
597 MAGIC *mg, *prevmg, *moremg;
598 PERL_ARGS_ASSERT_MG_FREE_TYPE;
599 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
600 MAGIC *newhead;
601 moremg = mg->mg_moremagic;
602 if (mg->mg_type == how) {
603 /* temporarily move to the head of the magic chain, in case
604 custom free code relies on this historical aspect of mg_free */
605 if (prevmg) {
606 prevmg->mg_moremagic = moremg;
607 mg->mg_moremagic = SvMAGIC(sv);
608 SvMAGIC_set(sv, mg);
609 }
610 newhead = mg->mg_moremagic;
611 mg_free_struct(sv, mg);
612 SvMAGIC_set(sv, newhead);
613 mg = prevmg;
614 }
615 }
616 mg_magical(sv);
617}
618
79072805 619#include <signal.h>
79072805 620
942e002e 621U32
864dbfa3 622Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 623{
97aff369 624 dVAR;
8772537c 625 PERL_UNUSED_ARG(sv);
6cef1e77 626
7918f24d
NC
627 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
628
0bd48802 629 if (PL_curpm) {
eb578fdb 630 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 631 if (rx) {
a678b0e4
YO
632 if (mg->mg_obj) { /* @+ */
633 /* return the number possible */
07bc277f 634 return RX_NPARENS(rx);
a678b0e4 635 } else { /* @- */
07bc277f 636 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
637
638 /* return the last filled */
f46c4081 639 while ( paren >= 0
07bc277f
NC
640 && (RX_OFFS(rx)[paren].start == -1
641 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 642 paren--;
a678b0e4
YO
643 return (U32)paren;
644 }
0bd48802 645 }
8f580fb8 646 }
ac27b0f5 647
942e002e 648 return (U32)-1;
6cef1e77
IZ
649}
650
6502e081
DM
651/* @-, @+ */
652
6cef1e77 653int
864dbfa3 654Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 655{
97aff369 656 dVAR;
7918f24d
NC
657
658 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
659
0bd48802 660 if (PL_curpm) {
eb578fdb 661 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 662 if (rx) {
eb578fdb 663 const I32 paren = mg->mg_len;
a10eae29
FC
664 SSize_t s;
665 SSize_t t;
0bd48802
AL
666 if (paren < 0)
667 return 0;
07bc277f
NC
668 if (paren <= (I32)RX_NPARENS(rx) &&
669 (s = RX_OFFS(rx)[paren].start) != -1 &&
670 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 671 {
a10eae29 672 SSize_t i;
0bd48802
AL
673 if (mg->mg_obj) /* @+ */
674 i = t;
675 else /* @- */
676 i = s;
677
a10eae29 678 if (RX_MATCH_UTF8(rx)) {
07bc277f 679 const char * const b = RX_SUBBEG(rx);
0bd48802 680 if (b)
6502e081
DM
681 i = RX_SUBCOFFSET(rx) +
682 utf8_length((U8*)b,
683 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 684 }
727405f8 685
a10eae29 686 sv_setuv(sv, i);
232af1f8 687 return 0;
1aa99e6b 688 }
0bd48802 689 }
6cef1e77 690 }
232af1f8 691 sv_setsv(sv, NULL);
6cef1e77
IZ
692 return 0;
693}
694
6502e081
DM
695/* @-, @+ */
696
e4b89193 697int
a29d06ed
MG
698Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
699{
7918f24d 700 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL
701 PERL_UNUSED_ARG(sv);
702 PERL_UNUSED_ARG(mg);
cb077ed2 703 Perl_croak_no_modify();
0dbb1585 704 NORETURN_FUNCTION_END;
a29d06ed
MG
705}
706
ad3296c6 707#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
708 if (SvPOK(sv)) { \
709 STRLEN len = SvCUR(sv); \
710 char * const p = SvPVX(sv); \
8e6b4db6
PC
711 while (len > 0 && isSPACE(p[len-1])) \
712 --len; \
713 SvCUR_set(sv, len); \
714 p[len] = '\0'; \
715 } \
ad3296c6
SH
716} STMT_END
717
8b850bd5
NC
718void
719Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
720{
7918f24d
NC
721 PERL_ARGS_ASSERT_EMULATE_COP_IO;
722
8b850bd5
NC
723 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
724 sv_setsv(sv, &PL_sv_undef);
725 else {
726 sv_setpvs(sv, "");
727 SvUTF8_off(sv);
728 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 729 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
730 assert(value);
731 sv_catsv(sv, value);
732 }
733 sv_catpvs(sv, "\0");
734 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 735 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
736 assert(value);
737 sv_catsv(sv, value);
738 }
739 }
740}
741
d9fe7d23
KW
742STATIC void
743S_fixup_errno_string(pTHX_ SV* sv)
744{
745 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
746 * Perl space. */
747
748 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
749
750 assert(SvOK(sv));
b35e4f8b
KW
751
752 if(strEQ(SvPVX(sv), "")) {
753 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
754 }
755 else {
d9fe7d23
KW
756
757 /* In some locales the error string may come back as UTF-8, in
758 * which case we should turn on that flag. This didn't use to
759 * happen, and to avoid any possible backward compatibility issues,
760 * we don't turn on the flag unless we have to. So the flag stays
761 * off for an entirely ASCII string. We assume that if the string
762 * looks like UTF-8, it really is UTF-8: "text in any other
763 * encoding that uses bytes with the high bit set is extremely
764 * unlikely to pass a UTF-8 validity test"
765 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
766 * potential that we will get it wrong however, especially on short
767 * error message text. (If it turns out to be necessary, we could
768 * also keep track if the current LC_MESSAGES locale is UTF-8) */
a6c83041
KW
769 if (! IN_BYTES /* respect 'use bytes' */
770 && ! is_ascii_string((U8*) SvPVX_const(sv), SvCUR(sv))
d9fe7d23
KW
771 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
772 {
773 SvUTF8_on(sv);
774 }
b35e4f8b 775 }
d9fe7d23
KW
776}
777
25bbd826
CB
778#ifdef VMS
779#include <descrip.h>
780#include <starlet.h>
781#endif
782
79072805 783int
864dbfa3 784Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 785{
27da23d5 786 dVAR;
eb578fdb
KW
787 I32 paren;
788 const char *s = NULL;
789 REGEXP *rx;
823a54a3 790 const char * const remaining = mg->mg_ptr + 1;
e91d8259 791 char nextchar;
79072805 792
7918f24d
NC
793 PERL_ARGS_ASSERT_MAGIC_GET;
794
e91d8259 795 if (!mg->mg_ptr) {
e91d8259 796 paren = mg->mg_len;
e91d8259 797 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 798 do_numbuf_fetch:
e91d8259
NC
799 CALLREG_NUMBUF_FETCH(rx,paren,sv);
800 } else {
801 sv_setsv(sv,&PL_sv_undef);
802 }
803 return 0;
804 }
805
806 nextchar = *remaining;
79072805 807 switch (*mg->mg_ptr) {
748a9306 808 case '\001': /* ^A */
f2da823f
FC
809 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
810 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT
811 if (SvTAINTED(PL_bodytarget))
812 SvTAINTED_on(sv);
748a9306 813 break;
e5218da5 814 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 815 if (nextchar == '\0') {
e5218da5
GA
816 sv_setiv(sv, (IV)PL_minus_c);
817 }
823a54a3 818 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
819 sv_setiv(sv, (IV)STATUS_NATIVE);
820 }
49460fe6
NIS
821 break;
822
79072805 823 case '\004': /* ^D */
aea4f609 824 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 825 break;
28f23441 826 case '\005': /* ^E */
6c6eab55
KW
827 if (nextchar != '\0') {
828 if (strEQ(remaining, "NCODING"))
829 sv_setsv(sv, PL_encoding);
4f4ff3a7 830 break;
6c6eab55 831 }
4f4ff3a7
KW
832
833#if defined(VMS) || defined(OS2) || defined(WIN32)
834# if defined(VMS)
2a99ff86
KW
835 {
836 char msg[255];
837 $DESCRIPTOR(msgdsc,msg);
838 sv_setnv(sv,(NV) vaxc$errno);
839 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
840 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
841 else
842 sv_setpvs(sv,"");
843 }
4b645107 844#elif defined(OS2)
2a99ff86
KW
845 if (!(_emx_env & 0x200)) { /* Under DOS */
846 sv_setnv(sv, (NV)errno);
847 sv_setpv(sv, errno ? Strerror(errno) : "");
848 } else {
849 if (errno != errno_isOS2) {
850 const int tmp = _syserrno();
851 if (tmp) /* 2nd call to _syserrno() makes it 0 */
852 Perl_rc = tmp;
853 }
854 sv_setnv(sv, (NV)Perl_rc);
855 sv_setpv(sv, os2error(Perl_rc));
856 }
1534c6f5 857 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
858 fixup_errno_string(sv);
859 }
4f4ff3a7 860# elif defined(WIN32)
2a99ff86
KW
861 {
862 const DWORD dwErr = GetLastError();
863 sv_setnv(sv, (NV)dwErr);
864 if (dwErr) {
865 PerlProc_GetOSError(sv, dwErr);
2efab60d 866 fixup_errno_string(sv);
2a99ff86
KW
867 }
868 else
869 sv_setpvs(sv, "");
870 SetLastError(dwErr);
871 }
4f4ff3a7
KW
872# else
873# error Missing code for platform
874# endif
2a99ff86
KW
875 SvRTRIM(sv);
876 SvNOK_on(sv); /* what a wonderful hack! */
877 break;
4f4ff3a7
KW
878#endif /* End of platforms with special handling for $^E; others just fall
879 through to $! */
46f3e16c
KW
880
881 case '!':
882 {
5f1b979d 883 dSAVE_ERRNO;
46f3e16c 884#ifdef VMS
5f1b979d 885 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 886#else
5f1b979d 887 sv_setnv(sv, (NV)errno);
46f3e16c
KW
888#endif
889#ifdef OS2
5f1b979d
KW
890 if (errno == errno_isOS2 || errno == errno_isOS2_set)
891 sv_setpv(sv, os2error(Perl_rc));
892 else
46f3e16c 893#endif
5f1b979d
KW
894 if (! errno) {
895 sv_setpvs(sv, "");
46f3e16c 896 }
5f1b979d
KW
897 else {
898
899 /* Strerror can return NULL on some platforms, which will
900 * result in 'sv' not being considered SvOK. The SvNOK_on()
901 * below will cause just the number part to be valid */
902 sv_setpv(sv, Strerror(errno));
903 if (SvOK(sv)) {
904 fixup_errno_string(sv);
905 }
906 }
907 RESTORE_ERRNO;
46f3e16c
KW
908 }
909
910 SvRTRIM(sv);
911 SvNOK_on(sv); /* what a wonderful hack! */
912 break;
913
79072805 914 case '\006': /* ^F */
3280af22 915 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 916 break;
9ebf26ad
FR
917 case '\007': /* ^GLOBAL_PHASE */
918 if (strEQ(remaining, "LOBAL_PHASE")) {
919 sv_setpvn(sv, PL_phase_names[PL_phase],
920 strlen(PL_phase_names[PL_phase]));
921 }
922 break;
a0d0e21e 923 case '\010': /* ^H */
3280af22 924 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 925 break;
9d116dd7 926 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 927 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 928 break;
8561ea1d
FC
929 case '\014': /* ^LAST_FH */
930 if (strEQ(remaining, "AST_FH")) {
931 if (PL_last_in_gv) {
932 assert(isGV_with_GP(PL_last_in_gv));
933 SV_CHECK_THINKFIRST_COW_DROP(sv);
934 prepare_SV_for_RV(sv);
935 SvOK_off(sv);
936 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
937 SvROK_on(sv);
938 sv_rvweaken(sv);
939 }
940 else sv_setsv_nomg(sv, NULL);
941 }
942 break;
ac27b0f5 943 case '\017': /* ^O & ^OPEN */
823a54a3 944 if (nextchar == '\0') {
ac27b0f5 945 sv_setpv(sv, PL_osname);
3511154c
DM
946 SvTAINTED_off(sv);
947 }
823a54a3 948 else if (strEQ(remaining, "PEN")) {
8b850bd5 949 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 950 }
28f23441 951 break;
9ebf26ad 952 case '\020':
a6d0b1b5 953 sv_setiv(sv, (IV)PL_perldb);
79072805 954 break;
fb73857a 955 case '\023': /* ^S */
a6d0b1b5 956 {
bc177e6b 957 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 958 SvOK_off(sv);
3280af22 959 else if (PL_in_eval)
6dc8a9e4 960 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
961 else
962 sv_setiv(sv, 0);
d58bf5aa 963 }
fb73857a 964 break;
79072805 965 case '\024': /* ^T */
823a54a3 966 if (nextchar == '\0') {
88e89b8a 967#ifdef BIG_TIME
7c36658b 968 sv_setnv(sv, PL_basetime);
88e89b8a 969#else
7c36658b 970 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 971#endif
7c36658b 972 }
823a54a3 973 else if (strEQ(remaining, "AINT"))
284167a5
SM
974 sv_setiv(sv, TAINTING_get
975 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 976 : 0);
7c36658b 977 break;
e07ea26a 978 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 979 if (strEQ(remaining, "NICODE"))
a05d7ebb 980 sv_setuv(sv, (UV) PL_unicode);
823a54a3 981 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 982 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
983 else if (strEQ(remaining, "TF8CACHE"))
984 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
985 break;
986 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 987 if (nextchar == '\0')
4438c4b7 988 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 989 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 990 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 991 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
992 }
993 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC
994 sv_setsv(sv, &PL_sv_undef);
995 break;
013b78e8 996 }
d3a7d8c7 997 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
998 /* Get the bit mask for $warnings::Bits{all}, because
999 * it could have been extended by warnings::register */
4bac9ae4
CS
1000 HV * const bits = get_hv("warnings::Bits", 0);
1001 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1002 if (bits_all)
1003 sv_copypv(sv, *bits_all);
1004 else
1005 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1006 }
4438c4b7 1007 else {
72dc9ed5
NC
1008 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1009 *PL_compiling.cop_warnings);
ac27b0f5 1010 }
4438c4b7 1011 }
79072805 1012 break;
79072805 1013 case '+':
aaa362c4 1014 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1015 paren = RX_LASTPAREN(rx);
1016 if (paren)
1017 goto do_numbuf_fetch;
79072805 1018 }
3280af22 1019 sv_setsv(sv,&PL_sv_undef);
79072805 1020 break;
a01268b5
JH
1021 case '\016': /* ^N */
1022 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1023 paren = RX_LASTCLOSEPAREN(rx);
1024 if (paren)
1025 goto do_numbuf_fetch;
a01268b5
JH
1026 }
1027 sv_setsv(sv,&PL_sv_undef);
1028 break;
79072805 1029 case '.':
3280af22 1030 if (GvIO(PL_last_in_gv)) {
357c8808 1031 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1032 }
79072805
LW
1033 break;
1034 case '?':
809a5acc 1035 {
809a5acc 1036 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1037#ifdef COMPLEX_STATUS
41cb7b2b 1038 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1039 LvTARGOFF(sv) = PL_statusvalue;
1040 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1041#endif
809a5acc 1042 }
79072805
LW
1043 break;
1044 case '^':
acbe1b9d 1045 if (GvIOp(PL_defoutgv))
099be4f1 1046 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1047 if (s)
1048 sv_setpv(sv,s);
1049 else {
3280af22 1050 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1051 sv_catpvs(sv,"_TOP");
79072805
LW
1052 }
1053 break;
1054 case '~':
acbe1b9d 1055 if (GvIOp(PL_defoutgv))
0daa599b 1056 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1057 if (!s)
3280af22 1058 s = GvENAME(PL_defoutgv);
79072805
LW
1059 sv_setpv(sv,s);
1060 break;
79072805 1061 case '=':
099be4f1 1062 if (GvIO(PL_defoutgv))
0daa599b 1063 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1064 break;
1065 case '-':
099be4f1 1066 if (GvIO(PL_defoutgv))
0daa599b 1067 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1068 break;
1069 case '%':
099be4f1 1070 if (GvIO(PL_defoutgv))
0daa599b 1071 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1072 break;
79072805
LW
1073 case ':':
1074 break;
1075 case '/':
1076 break;
1077 case '[':
e1dccc0d 1078 sv_setiv(sv, 0);
79072805
LW
1079 break;
1080 case '|':
099be4f1 1081 if (GvIO(PL_defoutgv))
0daa599b 1082 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1083 break;
79072805 1084 case '\\':
b2ce0fda 1085 if (PL_ors_sv)
f28098ff 1086 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS
1087 else
1088 sv_setsv(sv, &PL_sv_undef);
79072805 1089 break;
0e219455 1090 case '$': /* $$ */
9cdac2a2
FC
1091 {
1092 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1093 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1094 /* never set manually, or at least not since last fork */
1095 sv_setiv(sv, pid);
19db9fb7
Z
1096 /* never unsafe, even if reading in a tainted expression */
1097 SvTAINTED_off(sv);
1098 }
9cdac2a2
FC
1099 /* else a value has been assigned manually, so do nothing */
1100 }
0e219455 1101 break;
79072805 1102 case '<':
dfff4baf 1103 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1104 break;
1105 case '>':
dfff4baf 1106 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1107 break;
1108 case '(':
dfff4baf 1109 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1110 goto add_groups;
1111 case ')':
dfff4baf 1112 sv_setgid(sv, PerlProc_getegid());
79072805 1113 add_groups:
79072805 1114#ifdef HAS_GETGROUPS
79072805 1115 {
57d7c65e 1116 Groups_t *gary = NULL;
fb45abb2 1117 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1118 Newx(gary, num_groups, Groups_t);
1119 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1120 for (i = 0; i < num_groups; i++)
1121 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1122 Safefree(gary);
79072805 1123 }
155aba94 1124 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1125#endif
79072805 1126 break;
79072805
LW
1127 case '0':
1128 break;
1129 }
a0d0e21e 1130 return 0;
79072805
LW
1131}
1132
1133int
864dbfa3 1134Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1135{
8772537c 1136 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1137
7918f24d
NC
1138 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1139
79072805 1140 if (uf && uf->uf_val)
24f81a43 1141 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1142 return 0;
1143}
1144
1145int
864dbfa3 1146Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1147{
27da23d5 1148 dVAR;
9ae3433d 1149 STRLEN len = 0, klen;
12033064 1150 const char * const key = MgPV_const(mg,klen);
888a67f6 1151 const char *s = "";
1e422769 1152
7918f24d
NC
1153 PERL_ARGS_ASSERT_MAGIC_SETENV;
1154
613c63b4 1155 SvGETMAGIC(sv);
12033064 1156 if (SvOK(sv)) {
613c63b4
CS
1157 /* defined environment variables are byte strings; unfortunately
1158 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1159 (void)SvPV_force_nomg_nolen(sv);
1160 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1161 if (SvUTF8(sv)) {
1162 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1163 SvUTF8_off(sv);
1164 }
1165 s = SvPVX(sv);
1166 len = SvCUR(sv);
12033064
CS
1167 }
1168 my_setenv(key, s); /* does the deed */
1169
a0d0e21e
LW
1170#ifdef DYNAMIC_ENV_FETCH
1171 /* We just undefd an environment var. Is a replacement */
1172 /* waiting in the wings? */
1173 if (!len) {
6bd66ee9 1174 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1175 if (valp)
4ab59fcc 1176 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1177 }
1178#endif
1e422769 1179
39e571d4 1180#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1181 /* And you'll never guess what the dog had */
1182 /* in its mouth... */
284167a5 1183 if (TAINTING_get) {
1e422769
PP
1184 MgTAINTEDDIR_off(mg);
1185#ifdef VMS
6bd66ee9 1186 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1187 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1188 int i = 0, j = 0;
1189
6fca0082 1190 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1191 elt = eltbuf;
1e422769
PP
1192 do { /* DCL$PATH may be a search list */
1193 while (1) { /* as may dev portion of any element */
1194 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1195 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1196 cando_by_name(S_IWUSR,0,elt) ) {
1197 MgTAINTEDDIR_on(mg);
1198 return 0;
1199 }
1200 }
bd61b366 1201 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1202 *cp = '\0';
1203 if (my_trnlnm(elt, eltbuf, j++))
1204 elt = eltbuf;
1205 else
1206 break;
1207 }
1208 j = 0;
1209 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1210 }
1211#endif /* VMS */
12033064 1212 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1213 const char * const strend = s + len;
463ee0b2
LW
1214
1215 while (s < strend) {
96827780 1216 char tmpbuf[256];
c623ac67 1217 Stat_t st;
5f74f29c 1218 I32 i;
f5a63d97
AL
1219#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1220 const char path_sep = '|';
1221#else
1222 const char path_sep = ':';
1223#endif
96827780 1224 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1225 s, strend, path_sep, &i);
463ee0b2 1226 s++;
bb7a0f54 1227 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1228#ifdef VMS
1229 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1230#else
1231 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1232#endif
c6ed36e1 1233 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1234 MgTAINTEDDIR_on(mg);
1e422769
PP
1235 return 0;
1236 }
463ee0b2 1237 }
79072805
LW
1238 }
1239 }
39e571d4 1240#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1241
79072805
LW
1242 return 0;
1243}
1244
1245int
864dbfa3 1246Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1247{
7918f24d 1248 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1249 PERL_UNUSED_ARG(sv);
bd61b366 1250 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1251 return 0;
1252}
1253
88e89b8a 1254int
864dbfa3 1255Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1256{
97aff369 1257 dVAR;
7918f24d 1258 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1259 PERL_UNUSED_ARG(mg);
b0269e46 1260#if defined(VMS)
cea2e8a9 1261 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1262#else
3280af22 1263 if (PL_localizing) {
fb73857a 1264 HE* entry;
b0269e46 1265 my_clearenv();
85fbaab2
NC
1266 hv_iterinit(MUTABLE_HV(sv));
1267 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1268 I32 keylen;
1269 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1270 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1271 }
1272 }
1273#endif
1274 return 0;
1275}
1276
1277int
864dbfa3 1278Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1279{
27da23d5 1280 dVAR;
7918f24d 1281 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1282 PERL_UNUSED_ARG(sv);
1283 PERL_UNUSED_ARG(mg);
b0269e46
AB
1284#if defined(VMS)
1285 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1286#else
1287 my_clearenv();
1288#endif
3e3baf6d 1289 return 0;
66b1d557
HM
1290}
1291
64ca3a65 1292#ifndef PERL_MICRO
2d4fcd5e
AJ
1293#ifdef HAS_SIGPROCMASK
1294static void
1295restore_sigmask(pTHX_ SV *save_sv)
1296{
0bd48802 1297 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1298 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1299}
1300#endif
66b1d557 1301int
864dbfa3 1302Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1303{
97aff369 1304 dVAR;
88e89b8a 1305 /* Are we fetching a signal entry? */
708854f2 1306 int i = (I16)mg->mg_private;
7918f24d
NC
1307
1308 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1309
708854f2 1310 if (!i) {
84c7b88c
BF
1311 STRLEN siglen;
1312 const char * sig = MgPV_const(mg, siglen);
1313 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1314 }
1315
e02bfb16 1316 if (i > 0) {
22c35a8c
GS
1317 if(PL_psig_ptr[i])
1318 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1319 else {
46da273f 1320 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1321#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1322 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1323 sigstate = SIG_IGN;
2e34cc90
CL
1324#endif
1325#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1326 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1327 sigstate = SIG_DFL;
85b332e2 1328#endif
88e89b8a 1329 /* cache state so we don't fetch it again */
8aad04aa 1330 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1331 sv_setpvs(sv,"IGNORE");
88e89b8a 1332 else
3280af22 1333 sv_setsv(sv,&PL_sv_undef);
46da273f 1334 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1335 SvTEMP_off(sv);
1336 }
1337 }
1338 return 0;
1339}
1340int
864dbfa3 1341Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1342{
7918f24d 1343 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1344
38a124f0 1345 magic_setsig(NULL, mg);
179c85a2 1346 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1347}
3d37d572 1348
0a8e0eff 1349Signal_t
8aad04aa 1350#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1351Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1352#else
0a8e0eff 1353Perl_csighandler(int sig)
8aad04aa 1354#endif
0a8e0eff 1355{
1018e26f
NIS
1356#ifdef PERL_GET_SIG_CONTEXT
1357 dTHXa(PERL_GET_SIG_CONTEXT);
1358#else
85b332e2
CL
1359 dTHX;
1360#endif
23ada85b 1361#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1362 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1363 if (PL_sig_ignoring[sig]) return;
85b332e2 1364#endif
2e34cc90 1365#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1366 if (PL_sig_defaulting[sig])
2e34cc90
CL
1367#ifdef KILL_BY_SIGPRC
1368 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1369#else
1370 exit(1);
1371#endif
1372#endif
406878dd 1373 if (
853d2c32
RGS
1374#ifdef SIGILL
1375 sig == SIGILL ||
1376#endif
1377#ifdef SIGBUS
1378 sig == SIGBUS ||
1379#endif
1380#ifdef SIGSEGV
1381 sig == SIGSEGV ||
1382#endif
1383 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1384 /* Call the perl level handler now--
31c91b43 1385 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1386#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1387 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1388#else
1389 (*PL_sighandlerp)(sig);
92807b6d 1390#endif
406878dd 1391 else {
31c91b43 1392 if (!PL_psig_pend) return;
406878dd
GA
1393 /* Set a flag to say this signal is pending, that is awaiting delivery after
1394 * the current Perl opcode completes */
1395 PL_psig_pend[sig]++;
1396
1397#ifndef SIG_PENDING_DIE_COUNT
1398# define SIG_PENDING_DIE_COUNT 120
1399#endif
fe13d51d 1400 /* Add one to say _a_ signal is pending */
406878dd
GA
1401 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1402 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1403 (unsigned long)SIG_PENDING_DIE_COUNT);
1404 }
0a8e0eff
NIS
1405}
1406
2e34cc90
CL
1407#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1408void
1409Perl_csighandler_init(void)
1410{
1411 int sig;
27da23d5 1412 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1413
1414 for (sig = 1; sig < SIG_SIZE; sig++) {
1415#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1416 dTHX;
27da23d5 1417 PL_sig_defaulting[sig] = 1;
5c1546dc 1418 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1419#endif
1420#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1421 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1422#endif
1423 }
27da23d5 1424 PL_sig_handlers_initted = 1;
2e34cc90
CL
1425}
1426#endif
1427
7fe50b8b
LT
1428#if defined HAS_SIGPROCMASK
1429static void
1430unblock_sigmask(pTHX_ void* newset)
1431{
1432 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1433}
1434#endif
1435
0a8e0eff
NIS
1436void
1437Perl_despatch_signals(pTHX)
1438{
97aff369 1439 dVAR;
0a8e0eff
NIS
1440 int sig;
1441 PL_sig_pending = 0;
1442 for (sig = 1; sig < SIG_SIZE; sig++) {
1443 if (PL_psig_pend[sig]) {
d0166017 1444 dSAVE_ERRNO;
7fe50b8b 1445#ifdef HAS_SIGPROCMASK
55534442
LT
1446 /* From sigaction(2) (FreeBSD man page):
1447 * | Signal routines normally execute with the signal that
1448 * | caused their invocation blocked, but other signals may
1449 * | yet occur.
1450 * Emulation of this behavior (from within Perl) is enabled
1451 * using sigprocmask
1452 */
1453 int was_blocked;
1454 sigset_t newset, oldset;
1455
1456 sigemptyset(&newset);
1457 sigaddset(&newset, sig);
1458 sigprocmask(SIG_BLOCK, &newset, &oldset);
1459 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1460 if (!was_blocked) {
1461 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1462 ENTER;
1463 SAVEFREESV(save_sv);
1464 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1465 }
55534442 1466#endif
25da4428 1467 PL_psig_pend[sig] = 0;
6e324d09 1468#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1469 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1470#else
1471 (*PL_sighandlerp)(sig);
92807b6d 1472#endif
7fe50b8b 1473#ifdef HAS_SIGPROCMASK
55534442 1474 if (!was_blocked)
7fe50b8b 1475 LEAVE;
55534442 1476#endif
d0166017 1477 RESTORE_ERRNO;
0a8e0eff
NIS
1478 }
1479 }
1480}
1481
38a124f0 1482/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1483int
864dbfa3 1484Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1485{
27da23d5 1486 dVAR;
79072805 1487 I32 i;
cbbf8932 1488 SV** svp = NULL;
2d4fcd5e
AJ
1489 /* Need to be careful with SvREFCNT_dec(), because that can have side
1490 * effects (due to closures). We must make sure that the new disposition
1491 * is in place before it is called.
1492 */
cbbf8932 1493 SV* to_dec = NULL;
e72dc28c 1494 STRLEN len;
2d4fcd5e
AJ
1495#ifdef HAS_SIGPROCMASK
1496 sigset_t set, save;
1497 SV* save_sv;
1498#endif
eb578fdb 1499 const char *s = MgPV_const(mg,len);
7918f24d
NC
1500
1501 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1502
748a9306 1503 if (*s == '_') {
84c7b88c 1504 if (memEQs(s, len, "__DIE__"))
3280af22 1505 svp = &PL_diehook;
84c7b88c 1506 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1507 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1508 /* Merge the existing behaviours, which are as follows:
1509 magic_setsig, we always set svp to &PL_warnhook
1510 (hence we always change the warnings handler)
1511 For magic_clearsig, we don't change the warnings handler if it's
1512 set to the &PL_warnhook. */
3280af22 1513 svp = &PL_warnhook;
84c7b88c
BF
1514 } else if (sv) {
1515 SV *tmp = sv_newmortal();
1516 Perl_croak(aTHX_ "No such hook: %s",
1517 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1518 }
748a9306 1519 i = 0;
38a124f0 1520 if (svp && *svp) {
9289f461
RGS
1521 if (*svp != PERL_WARNHOOK_FATAL)
1522 to_dec = *svp;
cbbf8932 1523 *svp = NULL;
4633a7c4 1524 }
748a9306
LW
1525 }
1526 else {
708854f2
NC
1527 i = (I16)mg->mg_private;
1528 if (!i) {
84c7b88c 1529 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1530 mg->mg_private = (U16)i;
708854f2 1531 }
86d86cad 1532 if (i <= 0) {
84c7b88c
BF
1533 if (sv) {
1534 SV *tmp = sv_newmortal();
1535 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1536 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1537 }
748a9306
LW
1538 return 0;
1539 }
2d4fcd5e
AJ
1540#ifdef HAS_SIGPROCMASK
1541 /* Avoid having the signal arrive at a bad time, if possible. */
1542 sigemptyset(&set);
1543 sigaddset(&set,i);
1544 sigprocmask(SIG_BLOCK, &set, &save);
1545 ENTER;
9ff8e806 1546 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1547 SAVEFREESV(save_sv);
1548 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1549#endif
1550 PERL_ASYNC_CHECK();
2e34cc90 1551#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1552 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1553#endif
23ada85b 1554#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1555 PL_sig_ignoring[i] = 0;
85b332e2 1556#endif
2e34cc90 1557#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1558 PL_sig_defaulting[i] = 0;
2e34cc90 1559#endif
2d4fcd5e 1560 to_dec = PL_psig_ptr[i];
38a124f0
NC
1561 if (sv) {
1562 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1563 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1564
1565 /* Signals don't change name during the program's execution, so once
1566 they're cached in the appropriate slot of PL_psig_name, they can
1567 stay there.
1568
1569 Ideally we'd find some way of making SVs at (C) compile time, or
1570 at least, doing most of the work. */
1571 if (!PL_psig_name[i]) {
1572 PL_psig_name[i] = newSVpvn(s, len);
1573 SvREADONLY_on(PL_psig_name[i]);
1574 }
38a124f0 1575 } else {
79fd3822 1576 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1577 PL_psig_name[i] = NULL;
1578 PL_psig_ptr[i] = NULL;
1579 }
748a9306 1580 }
38a124f0 1581 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1582 if (i) {
5c1546dc 1583 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1584 }
748a9306 1585 else
b37c2d43 1586 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1587 } else {
9dfa190b
NC
1588 if (sv && SvOK(sv)) {
1589 s = SvPV_force(sv, len);
1590 } else {
1591 sv = NULL;
1592 }
84c7b88c 1593 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1594 if (i) {
23ada85b 1595#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1596 PL_sig_ignoring[i] = 1;
1597 (void)rsignal(i, PL_csighandlerp);
85b332e2 1598#else
9dfa190b 1599 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1600#endif
9dfa190b 1601 }
2d4fcd5e 1602 }
84c7b88c 1603 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1604 if (i) {
2e34cc90 1605#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1606 PL_sig_defaulting[i] = 1;
1607 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1608#else
9dfa190b 1609 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1610#endif
9dfa190b
NC
1611 }
1612 }
1613 else {
1614 /*
1615 * We should warn if HINT_STRICT_REFS, but without
1616 * access to a known hint bit in a known OP, we can't
1617 * tell whether HINT_STRICT_REFS is in force or not.
1618 */
1619 if (!strchr(s,':') && !strchr(s,'\''))
1620 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1621 SV_GMAGIC);
1622 if (i)
1623 (void)rsignal(i, PL_csighandlerp);
1624 else
1625 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1626 }
748a9306 1627 }
9dfa190b 1628
2d4fcd5e
AJ
1629#ifdef HAS_SIGPROCMASK
1630 if(i)
1631 LEAVE;
1632#endif
ef8d46e8 1633 SvREFCNT_dec(to_dec);
79072805
LW
1634 return 0;
1635}
64ca3a65 1636#endif /* !PERL_MICRO */
79072805
LW
1637
1638int
864dbfa3 1639Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1640{
97aff369 1641 dVAR;
7918f24d 1642 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1643 PERL_UNUSED_ARG(sv);
e1a479c5 1644
89c14e2e 1645 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1646 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1647 return 0;
1648
0e446081 1649 return magic_clearisa(NULL, mg);
463ee0b2
LW
1650}
1651
0e446081 1652/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1653int
52b45067
RD
1654Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1655{
1656 dVAR;
1657 HV* stash;
1658
7918f24d
NC
1659 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1660
52b45067 1661 /* Bail out if destruction is going on */
627364f1 1662 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1663
0e446081
NC
1664 if (sv)
1665 av_clear(MUTABLE_AV(sv));
52b45067 1666
6624142a
FC
1667 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1668 /* This occurs with setisa_elem magic, which calls this
1669 same function. */
1670 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1671
1672 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1673 SV **svp = AvARRAY((AV *)mg->mg_obj);
1674 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1675 while (items--) {
1676 stash = GvSTASH((GV *)*svp++);
1677 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1678 }
1679
1680 return 0;
1681 }
1682
52b45067 1683 stash = GvSTASH(
6624142a 1684 (const GV *)mg->mg_obj
52b45067
RD
1685 );
1686
00169e2c
FC
1687 /* The stash may have been detached from the symbol table, so check its
1688 name before doing anything. */
1689 if (stash && HvENAME_get(stash))
5562fa71 1690 mro_isa_changed_in(stash);
52b45067
RD
1691
1692 return 0;
1693}
1694
1695int
864dbfa3 1696Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1697{
85fbaab2 1698 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1699 I32 i = 0;
7918f24d
NC
1700
1701 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1702 PERL_UNUSED_ARG(mg);
7719e241 1703
6ff81951 1704 if (hv) {
497b47a8 1705 (void) hv_iterinit(hv);
ad64d0ec 1706 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1707 i = HvUSEDKEYS(hv);
497b47a8
JH
1708 else {
1709 while (hv_iternext(hv))
1710 i++;
1711 }
6ff81951
GS
1712 }
1713
1714 sv_setiv(sv, (IV)i);
1715 return 0;
1716}
1717
1718int
864dbfa3 1719Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1720{
7918f24d 1721 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1722 PERL_UNUSED_ARG(mg);
946ec16e 1723 if (LvTARG(sv)) {
85fbaab2 1724 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1725 }
1726 return 0;
ac27b0f5 1727}
946ec16e 1728
efaf3674
DM
1729/*
1730=for apidoc magic_methcall
1731
1732Invoke a magic method (like FETCH).
1733
2baee27b
FC
1734C<sv> and C<mg> are the tied thingy and the tie magic.
1735
1736C<meth> is the name of the method to call.
1737
1738C<argc> is the number of args (in addition to $self) to pass to the method.
1739
1740The C<flags> can be:
1741
1742 G_DISCARD invoke method with G_DISCARD flag and don't
1743 return a value
1744 G_UNDEF_FILL fill the stack with argc pointers to
1745 PL_sv_undef
1746
1747The arguments themselves are any values following the C<flags> argument.
efaf3674
DM
1748
1749Returns the SV (if any) returned by the method, or NULL on failure.
1750
1751
1752=cut
1753*/
1754
1755SV*
36925d9e 1756Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1757 U32 argc, ...)
a0d0e21e 1758{
97aff369 1759 dVAR;
a0d0e21e 1760 dSP;
efaf3674 1761 SV* ret = NULL;
463ee0b2 1762
7918f24d
NC
1763 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1764
efaf3674 1765 ENTER;
d1d7a15d
NC
1766
1767 if (flags & G_WRITING_TO_STDERR) {
1768 SAVETMPS;
1769
1770 save_re_context();
1771 SAVESPTR(PL_stderrgv);
1772 PL_stderrgv = NULL;
1773 }
1774
efaf3674 1775 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1776 PUSHMARK(SP);
efaf3674 1777
67549bd2
NC
1778 EXTEND(SP, argc+1);
1779 PUSHs(SvTIED_obj(sv, mg));
1780 if (flags & G_UNDEF_FILL) {
1781 while (argc--) {
efaf3674 1782 PUSHs(&PL_sv_undef);
93965878 1783 }
67549bd2 1784 } else if (argc > 0) {
046b0c7d
NC
1785 va_list args;
1786 va_start(args, argc);
1787
1788 do {
1789 SV *const sv = va_arg(args, SV *);
1790 PUSHs(sv);
1791 } while (--argc);
1792
1793 va_end(args);
88e89b8a 1794 }
463ee0b2 1795 PUTBACK;
efaf3674 1796 if (flags & G_DISCARD) {
36925d9e 1797 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1798 }
1799 else {
36925d9e 1800 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1801 ret = *PL_stack_sp--;
1802 }
1803 POPSTACK;
d1d7a15d
NC
1804 if (flags & G_WRITING_TO_STDERR)
1805 FREETMPS;
efaf3674
DM
1806 LEAVE;
1807 return ret;
1808}
1809
efaf3674 1810/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1811
efaf3674 1812STATIC SV*
36925d9e 1813S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1814 int n, SV *val)
1815{
1816 dVAR;
1817 SV* arg1 = NULL;
1818
1819 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1820
1821 if (mg->mg_ptr) {
1822 if (mg->mg_len >= 0) {
db4b3a1d 1823 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1824 }
1825 else if (mg->mg_len == HEf_SVKEY)
1826 arg1 = MUTABLE_SV(mg->mg_ptr);
1827 }
1828 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1829 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1830 sv_2mortal(arg1);
1831 }
1832 if (!arg1) {
046b0c7d 1833 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1834 }
046b0c7d 1835 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1836}
1837
76e3520e 1838STATIC int
36925d9e 1839S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1840{
efaf3674
DM
1841 dVAR;
1842 SV* ret;
463ee0b2 1843
7918f24d
NC
1844 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1845
efaf3674
DM
1846 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1847 if (ret)
1848 sv_setsv(sv, ret);
a0d0e21e
LW
1849 return 0;
1850}
463ee0b2 1851
a0d0e21e 1852int
864dbfa3 1853Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1854{
7918f24d
NC
1855 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1856
fd69380d 1857 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1858 mg->mg_flags |= MGf_GSKIP;
36925d9e 1859 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1860 return 0;
1861}
1862
1863int
864dbfa3 1864Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1865{
efaf3674 1866 dVAR;
b112cff9
DM
1867 MAGIC *tmg;
1868 SV *val;
7918f24d
NC
1869
1870 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1871
b112cff9
DM
1872 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1873 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1874 * public flags indicate its value based on copying from $val. Doing
1875 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1876 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1877 * wrong if $val happened to be tainted, as sv hasn't got magic
1878 * enabled, even though taint magic is in the chain. In which case,
1879 * fake up a temporary tainted value (this is easier than temporarily
1880 * re-enabling magic on sv). */
1881
284167a5 1882 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1883 && (tmg->mg_len & 1))
1884 {
1885 val = sv_mortalcopy(sv);
1886 SvTAINTED_on(val);
1887 }
1888 else
1889 val = sv;
1890
36925d9e 1891 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1892 return 0;
1893}
1894
1895int
864dbfa3 1896Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1897{
7918f24d
NC
1898 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1899
4c13be3f 1900 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1901 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1902}
463ee0b2 1903
93965878
NIS
1904
1905U32
864dbfa3 1906Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1907{
efaf3674 1908 dVAR;
22846ab4 1909 I32 retval = 0;
efaf3674 1910 SV* retsv;
93965878 1911
7918f24d
NC
1912 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1913
36925d9e 1914 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1915 if (retsv) {
1916 retval = SvIV(retsv)-1;
22846ab4
AB
1917 if (retval < -1)
1918 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1919 }
22846ab4 1920 return (U32) retval;
93965878
NIS
1921}
1922
cea2e8a9
GS
1923int
1924Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1925{
efaf3674 1926 dVAR;
463ee0b2 1927
7918f24d
NC
1928 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1929
36925d9e 1930 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1931 return 0;
1932}
1933
1934int
864dbfa3 1935Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1936{
efaf3674
DM
1937 dVAR;
1938 SV* ret;
463ee0b2 1939
7918f24d
NC
1940 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1941
36925d9e
RZ
1942 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1943 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1944 if (ret)
1945 sv_setsv(key,ret);
79072805
LW
1946 return 0;
1947}
1948
1949int
1146e912 1950Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1951{
7918f24d
NC
1952 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1953
36925d9e 1954 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1955}
a0d0e21e 1956
a3bcc51e
TP
1957SV *
1958Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1959{
efaf3674 1960 dVAR;
5fcbf73d 1961 SV *retval;
ad64d0ec
NC
1962 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1963 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1964
7918f24d
NC
1965 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1966
a3bcc51e
TP
1967 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1968 SV *key;
bfcb3514 1969 if (HvEITER_get(hv))
a3bcc51e
TP
1970 /* we are in an iteration so the hash cannot be empty */
1971 return &PL_sv_yes;
1972 /* no xhv_eiter so now use FIRSTKEY */
1973 key = sv_newmortal();
ad64d0ec 1974 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1975 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1976 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1977 }
1978
1979 /* there is a SCALAR method that we can call */
36925d9e 1980 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1981 if (!retval)
5fcbf73d 1982 retval = &PL_sv_undef;
a3bcc51e
TP
1983 return retval;
1984}
1985
a0d0e21e 1986int
864dbfa3 1987Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1988{
97aff369 1989 dVAR;
089b5c60 1990 SV **svp;
7918f24d
NC
1991
1992 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1993
089b5c60
NC
1994 /* The magic ptr/len for the debugger's hash should always be an SV. */
1995 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
1996 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 1997 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
1998 }
1999
2000 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2001 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2002 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2003 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2004
8772537c
AL
2005 if (svp && SvIOKp(*svp)) {
2006 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2007 if (o) {
7bbbc3c0
NC
2008#ifdef PERL_DEBUG_READONLY_OPS
2009 Slab_to_rw(OpSLAB(o));
2010#endif
8772537c 2011 /* set or clear breakpoint in the relevant control op */
089b5c60 2012 if (SvTRUE(sv))
8772537c
AL
2013 o->op_flags |= OPf_SPECIAL;
2014 else
2015 o->op_flags &= ~OPf_SPECIAL;
7bbbc3c0
NC
2016#ifdef PERL_DEBUG_READONLY_OPS
2017 Slab_to_ro(OpSLAB(o));
2018#endif
8772537c 2019 }
5df8de69 2020 }
79072805
LW
2021 return 0;
2022}
2023
2024int
8772537c 2025Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2026{
97aff369 2027 dVAR;
502c6561 2028 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2029
2030 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2031
83bf042f 2032 if (obj) {
e1dccc0d 2033 sv_setiv(sv, AvFILL(obj));
83bf042f 2034 } else {
d4a823b3 2035 sv_setsv(sv, NULL);
83bf042f 2036 }
79072805
LW
2037 return 0;
2038}
2039
2040int
864dbfa3 2041Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2042{
97aff369 2043 dVAR;
502c6561 2044 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2045
2046 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2047
83bf042f 2048 if (obj) {
e1dccc0d 2049 av_fill(obj, SvIV(sv));
83bf042f 2050 } else {
a2a5de95
NC
2051 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2052 "Attempt to set length of freed array");
83bf042f
NC
2053 }
2054 return 0;
2055}
2056
2057int
83f29afa
VP
2058Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2059{
2060 dVAR;
2061
2062 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2063 PERL_UNUSED_ARG(sv);
2064
2065 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2066#if IVSIZE == I32SIZE
2067 *((IV *) &(mg->mg_len)) = 0;
2068#else
83f29afa
VP
2069 if (mg->mg_ptr)
2070 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2071#endif
83f29afa
VP
2072
2073 return 0;
2074}
2075
2076int
83bf042f
NC
2077Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2078{
97aff369 2079 dVAR;
7918f24d
NC
2080
2081 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2082 PERL_UNUSED_ARG(sv);
7918f24d 2083
94f3782b
DM
2084 /* during global destruction, mg_obj may already have been freed */
2085 if (PL_in_clean_all)
1ea47f64 2086 return 0;
94f3782b 2087
83bf042f
NC
2088 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2089
2090 if (mg) {
2091 /* arylen scalar holds a pointer back to the array, but doesn't own a
2092 reference. Hence the we (the array) are about to go away with it
2093 still pointing at us. Clear its pointer, else it would be pointing
2094 at free memory. See the comment in sv_magic about reference loops,
2095 and why it can't own a reference to us. */
2096 mg->mg_obj = 0;
2097 }
a0d0e21e
LW
2098 return 0;
2099}
2100
2101int
864dbfa3 2102Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2103{
97aff369 2104 dVAR;
16eb5365 2105 SV* const lsv = LvTARG(sv);
96c2a8ff 2106 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2107
2108 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2109 PERL_UNUSED_ARG(mg);
ac27b0f5 2110
6174b39a
FC
2111 if (found && found->mg_len != -1) {
2112 STRLEN i = found->mg_len;
25fdce4a 2113 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2114 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2115 sv_setuv(sv, i);
a0d0e21e 2116 return 0;
a0d0e21e 2117 }
35995e5c 2118 sv_setsv(sv,NULL);
a0d0e21e
LW
2119 return 0;
2120}
2121
2122int
864dbfa3 2123Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2124{
97aff369 2125 dVAR;
16eb5365 2126 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2127 SSize_t pos;
2128 STRLEN len;
c00206c8 2129 STRLEN ulen = 0;
53d44271 2130 MAGIC* found;
aec43834 2131 const char *s;
a0d0e21e 2132
7918f24d 2133 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2134 PERL_UNUSED_ARG(mg);
ac27b0f5 2135
96c2a8ff 2136 found = mg_find_mglob(lsv);
3881461a 2137 if (!found) {
a0d0e21e
LW
2138 if (!SvOK(sv))
2139 return 0;
96c2a8ff 2140 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2141 }
2142 else if (!SvOK(sv)) {
3881461a 2143 found->mg_len = -1;
a0d0e21e
LW
2144 return 0;
2145 }
aec43834 2146 s = SvPV_const(lsv, len);
a0d0e21e 2147
e1dccc0d 2148 pos = SvIV(sv);
a0ed51b3 2149
7e2040f0 2150 if (DO_UTF8(lsv)) {
aec43834 2151 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2152 if (ulen)
2153 len = ulen;
a0ed51b3
LW
2154 }
2155
a0d0e21e
LW
2156 if (pos < 0) {
2157 pos += len;
2158 if (pos < 0)
2159 pos = 0;
2160 }
eb160463 2161 else if (pos > (SSize_t)len)
a0d0e21e 2162 pos = len;
a0ed51b3 2163
3881461a 2164 found->mg_len = pos;
25fdce4a 2165 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2166
79072805
LW
2167 return 0;
2168}
2169
2170int
864dbfa3 2171Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2172{
2173 STRLEN len;
35a4481c 2174 SV * const lsv = LvTARG(sv);
b83604b4 2175 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2176 STRLEN offs = LvTARGOFF(sv);
2177 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2178 const bool negoff = LvFLAGS(sv) & 1;
2179 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2180
2181 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2182 PERL_UNUSED_ARG(mg);
6ff81951 2183
83f78d1a 2184 if (!translate_substr_offsets(
4ddea69a 2185 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2186 negoff ? -(IV)offs : (IV)offs, !negoff,
2187 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2188 )) {
2189 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2190 sv_setsv_nomg(sv, &PL_sv_undef);
2191 return 0;
2192 }
2193
9aa983d2 2194 if (SvUTF8(lsv))
4ddea69a 2195 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2196 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2197 if (SvUTF8(lsv))
2ef4b674 2198 SvUTF8_on(sv);
6ff81951
GS
2199 return 0;
2200}
2201
2202int
864dbfa3 2203Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2204{
97aff369 2205 dVAR;
83f78d1a 2206 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2207 const char * const tmps = SvPV_const(sv, len);
dd374669 2208 SV * const lsv = LvTARG(sv);
777f7c56
EB
2209 STRLEN lvoff = LvTARGOFF(sv);
2210 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2211 const bool negoff = LvFLAGS(sv) & 1;
2212 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2213
2214 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2215 PERL_UNUSED_ARG(mg);
075a4a2b 2216
a74fb2cd
FC
2217 SvGETMAGIC(lsv);
2218 if (SvROK(lsv))
2219 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2220 "Attempt to use reference as lvalue in substr"
2221 );
fc061ed8
FC
2222 SvPV_force_nomg(lsv,lsv_len);
2223 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2224 if (!translate_substr_offsets(
2225 lsv_len,
2226 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2227 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2228 ))
2229 Perl_croak(aTHX_ "substr outside of string");
2230 oldtarglen = lvlen;
1aa99e6b 2231 if (DO_UTF8(sv)) {
73a087f0 2232 sv_utf8_upgrade_nomg(lsv);
d931b1be 2233 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2234 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2235 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2236 SvUTF8_on(lsv);
2237 }
0d336106 2238 else if (SvUTF8(lsv)) {
5fcbf73d 2239 const char *utf8;
d931b1be 2240 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2241 newtarglen = len;
5fcbf73d 2242 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2243 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2244 Safefree(utf8);
1aa99e6b 2245 }
b76f3ce2 2246 else {
a74fb2cd 2247 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2248 newtarglen = len;
b76f3ce2 2249 }
83f78d1a
FC
2250 if (!neglen) LvTARGLEN(sv) = newtarglen;
2251 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2252
79072805
LW
2253 return 0;
2254}
2255
2256int
864dbfa3 2257Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2258{
97aff369 2259 dVAR;
7918f24d
NC
2260
2261 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2262 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2263#ifdef NO_TAINT_SUPPORT
2264 PERL_UNUSED_ARG(mg);
2265#endif
7918f24d 2266
27cc343c 2267 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2268 return 0;
2269}
2270
2271int
864dbfa3 2272Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2273{
97aff369 2274 dVAR;
7918f24d
NC
2275
2276 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2277 PERL_UNUSED_ARG(sv);
7918f24d 2278
b01e650a 2279 /* update taint status */
284167a5 2280 if (TAINT_get)
b01e650a
DM
2281 mg->mg_len |= 1;
2282 else
2283 mg->mg_len &= ~1;
463ee0b2
LW
2284 return 0;
2285}
2286
2287int
864dbfa3 2288Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2289{
35a4481c 2290 SV * const lsv = LvTARG(sv);
7918f24d
NC
2291
2292 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2293 PERL_UNUSED_ARG(mg);
6ff81951 2294
2e9e14dd 2295 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2296
6ff81951
GS
2297 return 0;
2298}
2299
2300int
864dbfa3 2301Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2302{
7918f24d 2303 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2304 PERL_UNUSED_ARG(mg);
79072805
LW
2305 do_vecset(sv); /* XXX slurp this routine */
2306 return 0;
2307}
2308
13733cde
FC
2309SV *
2310Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2311{
97aff369 2312 dVAR;
a0714e2c 2313 SV *targ = NULL;
13733cde
FC
2314 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2315 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2316 assert(mg);
5f05dabc 2317 if (LvTARGLEN(sv)) {
68dc0745 2318 if (mg->mg_obj) {
8772537c 2319 SV * const ahv = LvTARG(sv);
85fbaab2 2320 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2321 if (he)
2322 targ = HeVAL(he);
68dc0745 2323 }
bbfdc870 2324 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2325 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2326 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2327 {
2328 if (SvRMAGICAL(av)) {
2329 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2330 targ = svp ? *svp : NULL;
2331 }
2332 else
bbfdc870 2333 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2334 }
68dc0745 2335 }
46da273f 2336 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2337 /* somebody else defined it for us */
2338 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2339 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2340 LvTARGLEN(sv) = 0;
2341 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2342 mg->mg_obj = NULL;
68dc0745
PP
2343 mg->mg_flags &= ~MGf_REFCOUNTED;
2344 }
13733cde 2345 return targ;
5f05dabc 2346 }
71be2cbc 2347 else
13733cde
FC
2348 return LvTARG(sv);
2349}
2350
2351int
2352Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2353{
2354 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2355
2356 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2357 return 0;
2358}
2359
2360int
864dbfa3 2361Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2362{
7918f24d 2363 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2364 PERL_UNUSED_ARG(mg);
71be2cbc 2365 if (LvTARGLEN(sv))
68dc0745
PP
2366 vivify_defelem(sv);
2367 if (LvTARG(sv)) {
5f05dabc 2368 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2369 SvSETMAGIC(LvTARG(sv));
2370 }
5f05dabc
PP
2371 return 0;
2372}
2373
71be2cbc 2374void
864dbfa3 2375Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2376{
97aff369 2377 dVAR;
74e13ce4 2378 MAGIC *mg;
a0714e2c 2379 SV *value = NULL;
71be2cbc 2380
7918f24d
NC
2381 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2382
14befaf4 2383 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2384 return;
68dc0745 2385 if (mg->mg_obj) {
8772537c 2386 SV * const ahv = LvTARG(sv);
85fbaab2 2387 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2388 if (he)
2389 value = HeVAL(he);
3280af22 2390 if (!value || value == &PL_sv_undef)
be2597df 2391 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2392 }
bbfdc870
FC
2393 else if (LvSTARGOFF(sv) < 0)
2394 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2395 else {
502c6561 2396 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2397 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2398 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2399 else {
bbfdc870 2400 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2401 if (!svp || !(value = *svp))
bbfdc870 2402 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2403 }
2404 }
b37c2d43 2405 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2406 SvREFCNT_dec(LvTARG(sv));
2407 LvTARG(sv) = value;
71be2cbc 2408 LvTARGLEN(sv) = 0;
68dc0745 2409 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2410 mg->mg_obj = NULL;
68dc0745 2411 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2412}
2413
2414int
864dbfa3 2415Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2416{
7918f24d 2417 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2418 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2419 return 0;
810b8aa5
GS
2420}
2421
2422int
864dbfa3 2423Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2424{
7918f24d 2425 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2426 PERL_UNUSED_CONTEXT;
0177730e 2427 PERL_UNUSED_ARG(sv);
565764a8 2428 mg->mg_len = -1;
93a17b20
LW
2429 return 0;
2430}
2431
2432int
864dbfa3 2433Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2434{
35a4481c 2435 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2436
7918f24d
NC
2437 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2438
79072805 2439 if (uf && uf->uf_set)
24f81a43 2440 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2441 return 0;
2442}
2443
c277df42 2444int
faf82a0b
AE
2445Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2446{
488344d2 2447 const char type = mg->mg_type;
7918f24d
NC
2448
2449 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2450
488344d2
NC
2451 if (type == PERL_MAGIC_qr) {
2452 } else if (type == PERL_MAGIC_bm) {
2453 SvTAIL_off(sv);
2454 SvVALID_off(sv);
2455 } else {
2456 assert(type == PERL_MAGIC_fm);
488344d2
NC
2457 }
2458 return sv_unmagic(sv, type);
faf82a0b
AE
2459}
2460
7a4c00b4 2461#ifdef USE_LOCALE_COLLATE
79072805 2462int
864dbfa3 2463Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2464{
7918f24d
NC
2465 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2466
bbce6d69 2467 /*
838b5b74 2468 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2469 * and vanished with a faint plop.
2470 */
96a5add6 2471 PERL_UNUSED_CONTEXT;
8772537c 2472 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2473 if (mg->mg_ptr) {
2474 Safefree(mg->mg_ptr);
2475 mg->mg_ptr = NULL;
565764a8 2476 mg->mg_len = -1;
7a4c00b4 2477 }
bbce6d69
PP
2478 return 0;
2479}
7a4c00b4 2480#endif /* USE_LOCALE_COLLATE */
bbce6d69 2481
7e8c5dac
HS
2482/* Just clear the UTF-8 cache data. */
2483int
2484Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2485{
7918f24d 2486 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2487 PERL_UNUSED_CONTEXT;
8772537c 2488 PERL_UNUSED_ARG(sv);
7e8c5dac 2489 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2490 mg->mg_ptr = NULL;
7e8c5dac
HS
2491 mg->mg_len = -1; /* The mg_len holds the len cache. */
2492 return 0;
2493}
2494
bbce6d69 2495int
864dbfa3 2496Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2497{
97aff369 2498 dVAR;
eb578fdb
KW
2499 const char *s;
2500 I32 paren;
2501 const REGEXP * rx;
79072805 2502 I32 i;
8990e307 2503 STRLEN len;
125b9982 2504 MAGIC *tmg;
2fdbfb4d 2505
7918f24d
NC
2506 PERL_ARGS_ASSERT_MAGIC_SET;
2507
e91d8259 2508 if (!mg->mg_ptr) {
960b831f 2509 paren = mg->mg_len;
1e05feb3 2510 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2511 setparen_got_rx:
2fdbfb4d 2512 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2513 } else {
2fdbfb4d
AB
2514 /* Croak with a READONLY error when a numbered match var is
2515 * set without a previous pattern match. Unless it's C<local $1>
2516 */
e91d8259 2517 croakparen:
2fdbfb4d 2518 if (!PL_localizing) {
cb077ed2 2519 Perl_croak_no_modify();
2fdbfb4d
AB
2520 }
2521 }
e91d8259
NC
2522 return 0;
2523 }
2524
2525 switch (*mg->mg_ptr) {
748a9306 2526 case '\001': /* ^A */
f2da823f
FC
2527 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2528 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2529 FmLINES(PL_bodytarget) = 0;
2530 if (SvPOK(PL_bodytarget)) {
2531 char *s = SvPVX(PL_bodytarget);
2532 while ( ((s = strchr(s, '\n'))) ) {
2533 FmLINES(PL_bodytarget)++;
2534 s++;
2535 }
2536 }
125b9982 2537 /* mg_set() has temporarily made sv non-magical */
284167a5 2538 if (TAINTING_get) {
125b9982
NT
2539 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2540 SvTAINTED_on(PL_bodytarget);
2541 else
2542 SvTAINTED_off(PL_bodytarget);
2543 }
748a9306 2544 break;
49460fe6 2545 case '\003': /* ^C */
f2338a2e 2546 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2547 break;
2548
79072805 2549 case '\004': /* ^D */
b4ab917c 2550#ifdef DEBUGGING
b83604b4 2551 s = SvPV_nolen_const(sv);
ddcf8bc1 2552 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2553 if (DEBUG_x_TEST || DEBUG_B_TEST)
2554 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2555#else
38ab35f8 2556 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2557#endif
79072805 2558 break;
28f23441 2559 case '\005': /* ^E */
d0063567 2560 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2561#ifdef VMS
38ab35f8 2562 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2563#else
2564# ifdef WIN32
d0063567 2565 SetLastError( SvIV(sv) );
e37778c2
NC
2566# else
2567# ifdef OS2
38ab35f8 2568 os2_setsyserrno(SvIV(sv));
e37778c2 2569# else
d0063567 2570 /* will anyone ever use this? */
38ab35f8 2571 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2572# endif
2573# endif
22fae026 2574#endif
d0063567
DK
2575 }
2576 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2577 SvREFCNT_dec(PL_encoding);
d0063567
DK
2578 if (SvOK(sv) || SvGMAGICAL(sv)) {
2579 PL_encoding = newSVsv(sv);
2580 }
2581 else {
a0714e2c 2582 PL_encoding = NULL;
d0063567
DK
2583 }
2584 }
2585 break;
79072805 2586 case '\006': /* ^F */
38ab35f8 2587 PL_maxsysfd = SvIV(sv);
79072805 2588 break;
a0d0e21e 2589 case '\010': /* ^H */
38ab35f8 2590 PL_hints = SvIV(sv);
a0d0e21e 2591 break;
9d116dd7 2592 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2593 Safefree(PL_inplace);
bd61b366 2594 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2595 break;
d9bad346
FC
2596 case '\016': /* ^N */
2597 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2598 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2599 goto croakparen;
28f23441 2600 case '\017': /* ^O */
ac27b0f5 2601 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2602 Safefree(PL_osname);
bd61b366 2603 PL_osname = NULL;
3511154c
DM
2604 if (SvOK(sv)) {
2605 TAINT_PROPER("assigning to $^O");
2e0de35c 2606 PL_osname = savesvpv(sv);
3511154c 2607 }
ac27b0f5
NIS
2608 }
2609 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2610 STRLEN len;
2611 const char *const start = SvPV(sv, len);
b54fc2b6 2612 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2613 SV *tmp;
8b850bd5
NC
2614
2615
2616 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2617 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2618
2619 /* Opening for input is more common than opening for output, so
2620 ensure that hints for input are sooner on linked list. */
59cd0e26 2621 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2622 SvUTF8(sv))
2623 : newSVpvs_flags("", SvUTF8(sv));
2624 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2625 mg_set(tmp);
8b850bd5 2626
f747ebd6
Z
2627 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2628 SvUTF8(sv));
2629 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2630 mg_set(tmp);
ac27b0f5 2631 }
28f23441 2632 break;
79072805 2633 case '\020': /* ^P */
2fdbfb4d
AB
2634 PL_perldb = SvIV(sv);
2635 if (PL_perldb && !PL_DBsingle)
2636 init_debugger();
9b9e0be4 2637 break;
79072805 2638 case '\024': /* ^T */
88e89b8a 2639#ifdef BIG_TIME
6b88bc9c 2640 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2641#else
38ab35f8 2642 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2643#endif
79072805 2644 break;
e07ea26a
NC
2645 case '\025': /* ^UTF8CACHE */
2646 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2647 PL_utf8cache = (signed char) sv_2iv(sv);
2648 }
2649 break;
fde18df1 2650 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2651 if (*(mg->mg_ptr+1) == '\0') {
2652 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2653 i = SvIV(sv);
ac27b0f5 2654 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2655 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2656 }
599cee73 2657 }
0a378802 2658 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2659 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2660 if (!SvPOK(sv)) {
2661 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2662 break;
2663 }
f4fc7782 2664 {
b5477537 2665 STRLEN len, i;
d3a7d8c7 2666 int accumulate = 0 ;
f4fc7782 2667 int any_fatals = 0 ;
b83604b4 2668 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2669 for (i = 0 ; i < len ; ++i) {
2670 accumulate |= ptr[i] ;
2671 any_fatals |= (ptr[i] & 0xAA) ;
2672 }
4243c432
NC
2673 if (!accumulate) {
2674 if (!specialWARN(PL_compiling.cop_warnings))
2675 PerlMemShared_free(PL_compiling.cop_warnings);
2676 PL_compiling.cop_warnings = pWARN_NONE;
2677 }
72dc9ed5 2678 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW
2679 else if (isWARN_on(
2680 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2681 WARN_ALL)
2682 && !any_fatals)
2683 {
4243c432
NC
2684 if (!specialWARN(PL_compiling.cop_warnings))
2685 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2686 PL_compiling.cop_warnings = pWARN_ALL;
2687 PL_dowarn |= G_WARN_ONCE ;
727405f8 2688 }
d3a7d8c7 2689 else {
72dc9ed5
NC
2690 STRLEN len;
2691 const char *const p = SvPV_const(sv, len);
2692
2693 PL_compiling.cop_warnings
8ee4cf24 2694 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2695 p, len);
2696
d3a7d8c7
GS
2697 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2698 PL_dowarn |= G_WARN_ONCE ;
2699 }
f4fc7782 2700
d3a7d8c7 2701 }
4438c4b7 2702 }
971a9dd3 2703 }
79072805
LW
2704 break;
2705 case '.':
3280af22
NIS
2706 if (PL_localizing) {
2707 if (PL_localizing == 1)
7766f137 2708 SAVESPTR(PL_last_in_gv);
748a9306 2709 }
3280af22 2710 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2711 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2712 break;
2713 case '^':
acbe1b9d
FC
2714 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2715 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2716 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2717 break;
2718 case '~':
acbe1b9d
FC
2719 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2720 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2721 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2722 break;
2723 case '=':
acbe1b9d 2724 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2725 break;
2726 case '-':
acbe1b9d
FC
2727 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2728 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2729 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2730 break;
2731 case '%':
acbe1b9d 2732 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2733 break;
2734 case '|':
4b65379b 2735 {
099be4f1 2736 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2737 if(!io)
2738 break;
38ab35f8 2739 if ((SvIV(sv)) == 0)
4b65379b
CS
2740 IoFLAGS(io) &= ~IOf_FLUSH;
2741 else {
2742 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2743 PerlIO *ofp = IoOFP(io);
2744 if (ofp)
2745 (void)PerlIO_flush(ofp);
2746 IoFLAGS(io) |= IOf_FLUSH;
2747 }
2748 }
79072805
LW
2749 }
2750 break;
79072805 2751 case '/':
3280af22 2752 SvREFCNT_dec(PL_rs);
8bfdd7d9 2753 PL_rs = newSVsv(sv);
79072805
LW
2754 break;
2755 case '\\':
ef8d46e8 2756 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2757 if (SvOK(sv)) {
7889fe52 2758 PL_ors_sv = newSVsv(sv);
009c130f 2759 }
e3c19b7b 2760 else {
a0714e2c 2761 PL_ors_sv = NULL;
e3c19b7b 2762 }
79072805 2763 break;
7d69d4a6
FC
2764 case '[':
2765 if (SvIV(sv) != 0)
2766 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2767 break;
79072805 2768 case '?':
ff0cee69 2769#ifdef COMPLEX_STATUS
6b88bc9c 2770 if (PL_localizing == 2) {
41cb7b2b 2771 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2772 PL_statusvalue = LvTARGOFF(sv);
2773 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2774 }
2775 else
2776#endif
2777#ifdef VMSISH_STATUS
2778 if (VMSISH_STATUS)
fb38d079 2779 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2780 else
2781#endif
38ab35f8 2782 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2783 break;
2784 case '!':
93189314
JH
2785 {
2786#ifdef VMS
2787# define PERL_VMS_BANG vaxc$errno
2788#else
2789# define PERL_VMS_BANG 0
2790#endif
27329181 2791#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2792 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2793 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2794#else
91487cfc 2795 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2796 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2797#endif
93189314 2798 }
79072805
LW
2799 break;
2800 case '<':
985213f2 2801 {
04783dc7 2802 int rc = 0;
dfff4baf 2803 const Uid_t new_uid = SvUID(sv);
985213f2 2804 PL_delaymagic_uid = new_uid;
3280af22
NIS
2805 if (PL_delaymagic) {
2806 PL_delaymagic |= DM_RUID;
79072805
LW
2807 break; /* don't do magic till later */
2808 }
2809#ifdef HAS_SETRUID
04783dc7 2810 rc = setruid(new_uid);
79072805
LW
2811#else
2812#ifdef HAS_SETREUID
04783dc7 2813 rc = setreuid(new_uid, (Uid_t)-1);
748a9306 2814#else
85e6fe83 2815#ifdef HAS_SETRESUID
04783dc7 2816 rc = setresuid(new_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2817#else
985213f2 2818 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2819#ifdef PERL_DARWIN
2820 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2821 if (new_uid != 0 && PerlProc_getuid() == 0)
04783dc7 2822 rc = PerlProc_setuid(0);
75870ed3 2823#endif
04783dc7 2824 rc = PerlProc_setuid(new_uid);
75870ed3 2825 } else {
cea2e8a9 2826 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2827 }
79072805
LW
2828#endif
2829#endif
85e6fe83 2830#endif
04783dc7
DM
2831 /* XXX $< currently silently ignores failures */
2832 PERL_UNUSED_VAR(rc);
79072805 2833 break;
985213f2 2834 }
79072805 2835 case '>':
985213f2 2836 {
04783dc7 2837 int rc = 0;
dfff4baf 2838 const Uid_t new_euid = SvUID(sv);
985213f2 2839 PL_delaymagic_euid = new_euid;
3280af22
NIS
2840 if (PL_delaymagic) {
2841 PL_delaymagic |= DM_EUID;
79072805
LW
2842 break; /* don't do magic till later */
2843 }
2844#ifdef HAS_SETEUID
04783dc7 2845 rc = seteuid(new_euid);
79072805
LW
2846#else
2847#ifdef HAS_SETREUID
04783dc7 2848 rc = setreuid((Uid_t)-1, new_euid);
85e6fe83
LW
2849#else
2850#ifdef HAS_SETRESUID
04783dc7 2851 rc = setresuid((Uid_t)-1, new_euid, (Uid_t)-1);
79072805 2852#else
985213f2 2853 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
04783dc7 2854 rc = PerlProc_setuid(new_euid);
a0d0e21e 2855 else {
cea2e8a9 2856 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2857 }
79072805
LW
2858#endif
2859#endif
85e6fe83 2860#endif
04783dc7
DM
2861 /* XXX $> currently silently ignores failures */
2862 PERL_UNUSED_VAR(rc);
79072805 2863 break;
985213f2 2864 }
79072805 2865 case '(':
985213f2 2866 {
04783dc7 2867 int rc = 0;
dfff4baf 2868 const Gid_t new_gid = SvGID(sv);
985213f2 2869 PL_delaymagic_gid = new_gid;
3280af22
NIS
2870 if (PL_delaymagic) {
2871 PL_delaymagic |= DM_RGID;
79072805
LW
2872 break; /* don't do magic till later */
2873 }
2874#ifdef HAS_SETRGID
04783dc7 2875 rc = setrgid(new_gid);
79072805
LW
2876#else
2877#ifdef HAS_SETREGID
04783dc7 2878 rc = setregid(new_gid, (Gid_t)-1);
85e6fe83
LW
2879#else
2880#ifdef HAS_SETRESGID
04783dc7 2881 rc = setresgid(new_gid, (Gid_t)-1, (Gid_t) -1);
79072805 2882#else
985213f2 2883 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
04783dc7 2884 rc = PerlProc_setgid(new_gid);
748a9306 2885 else {
cea2e8a9 2886 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2887 }
79072805
LW
2888#endif
2889#endif
85e6fe83 2890#endif
04783dc7
DM
2891 /* XXX $( currently silently ignores failures */
2892 PERL_UNUSED_VAR(rc);
79072805 2893 break;
985213f2 2894 }
79072805 2895 case ')':
985213f2 2896 {
04783dc7 2897 int rc = 0;
dfff4baf 2898 Gid_t new_egid;
5cd24f17
PP
2899#ifdef HAS_SETGROUPS
2900 {
b83604b4 2901 const char *p = SvPV_const(sv, len);
757f63d8 2902 Groups_t *gary = NULL;
fb4089e0 2903#ifdef _SC_NGROUPS_MAX
2904 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2905
2906 if (maxgrp < 0)
2907 maxgrp = NGROUPS;
2908#else
2909 int maxgrp = NGROUPS;
2910#endif
757f63d8
SP
2911
2912 while (isSPACE(*p))
2913 ++p;
dfff4baf 2914 new_egid = (Gid_t)Atol(p);
fb4089e0 2915 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP
2916 while (*p && !isSPACE(*p))
2917 ++p;
2918 while (isSPACE(*p))
2919 ++p;
2920 if (!*p)
2921 break;
2922 if(!gary)
2923 Newx(gary, i + 1, Groups_t);
2924 else
2925 Renew(gary, i + 1, Groups_t);
dfff4baf 2926 gary[i] = (Groups_t)Atol(p);
757f63d8
SP
2927 }
2928 if (i)
04783dc7 2929 rc = setgroups(i, gary);
f5a63d97 2930 Safefree(gary);
5cd24f17
PP
2931 }
2932#else /* HAS_SETGROUPS */
dfff4baf 2933 new_egid = SvGID(sv);
5cd24f17 2934#endif /* HAS_SETGROUPS */
985213f2 2935 PL_delaymagic_egid = new_egid;
3280af22
NIS
2936 if (PL_delaymagic) {
2937 PL_delaymagic |= DM_EGID;
79072805
LW
2938 break; /* don't do magic till later */
2939 }
2940#ifdef HAS_SETEGID
04783dc7 2941 rc = setegid(new_egid);
79072805
LW
2942#else
2943#ifdef HAS_SETREGID
04783dc7 2944 rc = setregid((Gid_t)-1, new_egid);
85e6fe83
LW
2945#else
2946#ifdef HAS_SETRESGID
04783dc7 2947 rc = setresgid((Gid_t)-1, new_egid, (Gid_t)-1);
79072805 2948#else
985213f2 2949 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
04783dc7 2950 rc = PerlProc_setgid(new_egid);
748a9306 2951 else {
cea2e8a9 2952 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2953 }
79072805
LW
2954#endif
2955#endif
85e6fe83 2956#endif
04783dc7
DM
2957 /* XXX $) currently silently ignores failures */
2958 PERL_UNUSED_VAR(rc);
79072805 2959 break;
985213f2 2960 }
79072805 2961 case ':':
2d8e6c8d 2962 PL_chopset = SvPV_force(sv,len);
79072805 2963 break;
9cdac2a2
FC
2964 case '$': /* $$ */
2965 /* Store the pid in mg->mg_obj so we can tell when a fork has
2966 occurred. mg->mg_obj points to *$ by default, so clear it. */
2967 if (isGV(mg->mg_obj)) {
2968 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2969 SvREFCNT_dec(mg->mg_obj);
2970 mg->mg_flags |= MGf_REFCOUNTED;
2971 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2972 }
2973 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2974 break;
79072805 2975 case '0':
e2975953 2976 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2977#ifdef HAS_SETPROCTITLE
2978 /* The BSDs don't show the argv[] in ps(1) output, they
2979 * show a string from the process struct and provide
2980 * the setproctitle() routine to manipulate that. */
a2722ac9 2981 if (PL_origalen != 1) {
b83604b4 2982 s = SvPV_const(sv, len);
98b76f99 2983# if __FreeBSD_version > 410001
9aad2c0e 2984 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2985 * but not the "(perl) suffix from the ps(1)
2986 * output, because that's what ps(1) shows if the
2987 * argv[] is modified. */
6f2ad931 2988 setproctitle("-%s", s);
9aad2c0e 2989# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2990 /* This doesn't really work if you assume that
2991 * $0 = 'foobar'; will wipe out 'perl' from the $0
2992 * because in ps(1) output the result will be like
2993 * sprintf("perl: %s (perl)", s)
2994 * I guess this is a security feature:
2995 * one (a user process) cannot get rid of the original name.
2996 * --jhi */
2997 setproctitle("%s", s);
2998# endif
2999 }
9d3968b2 3000#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 3001 if (PL_origalen != 1) {
17aa7f3d 3002 union pstun un;
b83604b4 3003 s = SvPV_const(sv, len);
6867be6d 3004 un.pst_command = (char *)s;
17aa7f3d
JH
3005 pstat(PSTAT_SETCMD, un, len, 0, 0);
3006 }
9d3968b2 3007#else
2d2af554
GA
3008 if (PL_origalen > 1) {
3009 /* PL_origalen is set in perl_parse(). */
3010 s = SvPV_force(sv,len);
3011 if (len >= (STRLEN)PL_origalen-1) {
3012 /* Longer than original, will be truncated. We assume that
3013 * PL_origalen bytes are available. */
3014 Copy(s, PL_origargv[0], PL_origalen-1, char);
3015 }
3016 else {
3017 /* Shorter than original, will be padded. */
235ac35d 3018#ifdef PERL_DARWIN
60777a0d
JH
3019 /* Special case for Mac OS X: see [perl #38868] */
3020 const int pad = 0;
235ac35d 3021#else
8a89a4f1
MB
3022 /* Is the space counterintuitive? Yes.
3023 * (You were expecting \0?)
3024 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3025 * --jhi */
60777a0d 3026 const int pad = ' ';
235ac35d 3027#endif
60777a0d
JH
3028 Copy(s, PL_origargv[0], len, char);
3029 PL_origargv[0][len] = 0;
3030 memset(PL_origargv[0] + len + 1,
3031 pad, PL_origalen - len - 1);
2d2af554
GA
3032 }
3033 PL_origargv[0][PL_origalen-1] = 0;
3034 for (i = 1; i < PL_origargc; i++)
3035 PL_origargv[i] = 0;
7636ea95
AB
3036#ifdef HAS_PRCTL_SET_NAME
3037 /* Set the legacy process name in addition to the POSIX name on Linux */
3038 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3039 /* diag_listed_as: SKIPME */
3040 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3041 }
3042#endif
79072805 3043 }
9d3968b2 3044#endif
e2975953 3045 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3046 break;
3047 }
3048 return 0;
3049}
3050
3051I32
84c7b88c
BF
3052Perl_whichsig_sv(pTHX_ SV *sigsv)
3053{
3054 const char *sigpv;
3055 STRLEN siglen;
3056 PERL_ARGS_ASSERT_WHICHSIG_SV;
3057 PERL_UNUSED_CONTEXT;
3058 sigpv = SvPV_const(sigsv, siglen);
3059 return whichsig_pvn(sigpv, siglen);
3060}
3061
3062I32
3063Perl_whichsig_pv(pTHX_ const char *sig)
3064{
3065 PERL_ARGS_ASSERT_WHICHSIG_PV;
3066 PERL_UNUSED_CONTEXT;
3067 return whichsig_pvn(sig, strlen(sig));
3068}
3069
3070I32
3071Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3072{
eb578fdb 3073 char* const* sigv;
7918f24d 3074
84c7b88c 3075 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3076 PERL_UNUSED_CONTEXT;
79072805 3077
aadb217d 3078 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3079 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3080 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3081#ifdef SIGCLD
84c7b88c 3082 if (memEQs(sig, len, "CHLD"))
79072805
LW
3083 return SIGCLD;
3084#endif
3085#ifdef SIGCHLD
84c7b88c 3086 if (memEQs(sig, len, "CLD"))
79072805
LW
3087 return SIGCHLD;
3088#endif
7f1236c0 3089 return -1;
79072805
LW
3090}
3091
ecfc5424 3092Signal_t
1e82f5a6 3093#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3094Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3095#else
3096Perl_sighandler(int sig)
3097#endif
79072805 3098{
1018e26f
NIS
3099#ifdef PERL_GET_SIG_CONTEXT
3100 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3101#else
cea2e8a9 3102 dTHX;
71d280e3 3103#endif
79072805 3104 dSP;
a0714e2c
SS
3105 GV *gv = NULL;
3106 SV *sv = NULL;
8772537c 3107 SV * const tSv = PL_Sv;
601f1833 3108 CV *cv = NULL;
533c011a 3109 OP *myop = PL_op;
84902520 3110 U32 flags = 0;
8772537c 3111 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3112 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3113 SV *errsv_save = NULL;
71d280e3 3114
84902520 3115
727405f8 3116 if (!PL_psig_ptr[sig]) {
99ef548b 3117 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3118 PL_sig_name[sig]);
3119 exit(sig);
3120 }
ff0cee69 3121
a0d63a7b
DM
3122 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3123 /* Max number of items pushed there is 3*n or 4. We cannot fix
3124 infinity, so we fix 4 (in fact 5): */
3125 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3126 flags |= 1;
3127 PL_savestack_ix += 5; /* Protect save in progress. */
3128 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3129 }
84902520 3130 }
84902520 3131 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3132 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3133 || SvTYPE(cv) != SVt_PVCV) {
3134 HV *st;
f2c0649b 3135 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3136 }
84902520 3137
a0d0e21e 3138 if (!cv || !CvROOT(cv)) {
a2a5de95
NC
3139 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3140 PL_sig_name[sig], (gv ? GvENAME(gv)
3141 : ((cv && CvGV(cv))
3142 ? GvENAME(CvGV(cv))
3143 : "__ANON__")));
00d579c5 3144 goto cleanup;
79072805
LW
3145 }
3146
0c4d3b5e
DM
3147 sv = PL_psig_name[sig]
3148 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3149 : newSVpv(PL_sig_name[sig],0);
72048cfe 3150 flags |= 8;
0c4d3b5e
DM
3151 SAVEFREESV(sv);
3152
a0d63a7b
DM
3153 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3154 /* make sure our assumption about the size of the SAVEs are correct:
3155 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3156 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3157 }
e336de0d 3158
e788e7d3 3159 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3160 PUSHMARK(SP);
79072805 3161 PUSHs(sv);
8aad04aa
JH
3162#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3163 {
3164 struct sigaction oact;
3165
3166 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3167 if (sip) {
3168 HV *sih = newHV();
ad64d0ec 3169 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3170 /* The siginfo fields signo, code, errno, pid, uid,
3171 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3172 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3173 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3174#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
3175 hv_stores(sih, "errno", newSViv(sip->si_errno));
3176 hv_stores(sih, "status", newSViv(sip->si_status));
3177 hv_stores(sih, "uid", newSViv(sip->si_uid));
3178 hv_stores(sih, "pid", newSViv(sip->si_pid));
3179 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3180 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3181#endif
8aad04aa 3182 EXTEND(SP, 2);
ad64d0ec 3183 PUSHs(rv);
22f1178f 3184 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3185 }
b4552a27 3186
8aad04aa
JH
3187 }
3188 }
3189#endif
79072805 3190 PUTBACK;
a0d0e21e 3191
100c03aa
JL
3192 errsv_save = newSVsv(ERRSV);
3193
ad64d0ec 3194 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3195
d3acc0f7 3196 POPSTACK;
eed484f9
DD
3197 {
3198 SV * const errsv = ERRSV;
3199 if (SvTRUE_NN(errsv)) {
3200 SvREFCNT_dec(errsv_save);
c22d665b 3201#ifndef PERL_MICRO
1b266415
NIS
3202 /* Handler "died", for example to get out of a restart-able read().
3203 * Before we re-do that on its behalf re-enable the signal which was
3204 * blocked by the system when we entered.
3205 */
c22d665b 3206#ifdef HAS_SIGPROCMASK
d488af49 3207#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3208 if (sip || uap)
c22d665b 3209#endif
eed484f9
DD
3210 {
3211 sigset_t set;
3212 sigemptyset(&set);
3213 sigaddset(&set,sig);
3214 sigprocmask(SIG_UNBLOCK, &set, NULL);
3215 }
c22d665b 3216#else
eed484f9
DD
3217 /* Not clear if this will work */
3218 (void)rsignal(sig, SIG_IGN);
3219 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3220#endif
3221#endif /* !PERL_MICRO */
eed484f9
DD
3222 die_sv(errsv);
3223 }
3224 else {
3225 sv_setsv(errsv, errsv_save);
3226 SvREFCNT_dec(errsv_save);
3227 }
100c03aa
JL
3228 }
3229
00d579c5 3230cleanup:
0c4d3b5e
DM
3231 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3232 PL_savestack_ix = old_ss_ix;
72048cfe 3233 if (flags & 8)
2357bae7 3234 SvREFCNT_dec_NN(sv);
533c011a 3235 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3236
3280af22
NIS
3237 PL_Sv = tSv; /* Restore global temporaries. */
3238 PL_Xpv = tXpv;
53bb94e2 3239 return;
79072805 3240}
4e35701f
NIS
3241
3242
51371543 3243static void
8772537c 3244S_restore_magic(pTHX_ const void *p)
51371543 3245{
97aff369 3246 dVAR;
8772537c
AL
3247 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3248 SV* const sv = mgs->mgs_sv;
150b625d 3249 bool bumped;
51371543
GS
3250
3251 if (!sv)
3252 return;
3253
4bac9ae4
CS
3254 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3255 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3256#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
3257 /* While magic was saved (and off) sv_setsv may well have seen
3258 this SV as a prime candidate for COW. */
3259 if (SvIsCOW(sv))
e424a81e 3260 sv_force_normal_flags(sv, 0);
f9701176 3261#endif
f9c6fee5
CS
3262 if (mgs->mgs_readonly)
3263 SvREADONLY_on(sv);
3264 if (mgs->mgs_magical)
3265 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS
3266 else
3267 mg_magical(sv);
51371543
GS
3268 }
3269
150b625d 3270 bumped = mgs->mgs_bumped;
51371543
GS
3271 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3272
3273 /* If we're still on top of the stack, pop us off. (That condition
3274 * will be satisfied if restore_magic was called explicitly, but *not*
3275 * if it's being called via leave_scope.)
3276 * The reason for doing this is that otherwise, things like sv_2cv()
3277 * may leave alloc gunk on the savestack, and some code
3278 * (e.g. sighandler) doesn't expect that...
3279 */
3280 if (PL_savestack_ix == mgs->mgs_ss_ix)
3281 {
1be36ce0
NC
3282 UV popval = SSPOPUV;
3283 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3284 PL_savestack_ix -= 2;
1be36ce0
NC
3285 popval = SSPOPUV;
3286 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3287 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3288 }
150b625d
DM
3289 if (bumped) {
3290 if (SvREFCNT(sv) == 1) {
3291 /* We hold the last reference to this SV, which implies that the
3292 SV was deleted as a side effect of the routines we called.
3293 So artificially keep it alive a bit longer.
3294 We avoid turning on the TEMP flag, which can cause the SV's
3295 buffer to get stolen (and maybe other stuff). */
150b625d 3296 sv_2mortal(sv);
4bac9ae4 3297 SvTEMP_off(sv);
8985fe98 3298 }
150b625d 3299 else
2357bae7 3300 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3301 }
51371543
GS
3302}
3303
0c4d3b5e
DM
3304/* clean up the mess created by Perl_sighandler().
3305 * Note that this is only called during an exit in a signal handler;
3306 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3307 * skipped over. */
0c4d3b5e 3308
51371543 3309static void
8772537c 3310S_unwind_handler_stack(pTHX_ const void *p)
51371543 3311{
27da23d5 3312 dVAR;
0c4d3b5e 3313 PERL_UNUSED_ARG(p);
7918f24d 3314
0c4d3b5e 3315 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3316}
1018e26f 3317
66610fdd 3318/*
b3ca2e83
NC
3319=for apidoc magic_sethint
3320
3321Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3322C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3323anything that would need a deep copy. Maybe we should warn if we find a
3324reference.
b3ca2e83
NC
3325
3326=cut
3327*/
3328int
3329Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3330{
3331 dVAR;
ad64d0ec 3332 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3333 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3334
7918f24d
NC
3335 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3336
e6e3e454
NC
3337 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3338 an alternative leaf in there, with PL_compiling.cop_hints being used if
3339 it's NULL. If needed for threads, the alternative could lock a mutex,
3340 or take other more complex action. */
3341
5b9c0671
NC
3342 /* Something changed in %^H, so it will need to be restored on scope exit.
3343 Doing this here saves a lot of doing it manually in perl code (and
3344 forgetting to do it, and consequent subtle errors. */
3345 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3346 CopHINTHASH_set(&PL_compiling,
3347 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3348 return 0;
3349}
3350
3351/*
f175cff5 3352=for apidoc magic_clearhint
b3ca2e83 3353
c28fe1ec
NC
3354Triggered by a delete from %^H, records the key to
3355C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3356
3357=cut
3358*/
3359int
3360Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3361{
3362 dVAR;
7918f24d
NC
3363
3364 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3365 PERL_UNUSED_ARG(sv);
3366
5b9c0671 3367 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3368 CopHINTHASH_set(&PL_compiling,
e3352591
FC
3369 mg->mg_len == HEf_SVKEY
3370 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3371 MUTABLE_SV(mg->mg_ptr), 0, 0)
3372 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3373 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC
3374 return 0;
3375}
3376
3377/*
f747ebd6
Z
3378=for apidoc magic_clearhints
3379
3380Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3381
3382=cut
3383*/
3384int
3385Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3386{
3387 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3388 PERL_UNUSED_ARG(sv);
3389 PERL_UNUSED_ARG(mg);
20439bc7
Z
3390 cophh_free(CopHINTHASH_get(&PL_compiling));
3391 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z
3392 return 0;
3393}
3394
09fb282d
FC
3395int
3396Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3397 const char *name, I32 namlen)
3398{
3399 MAGIC *nmg;
3400
3401 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3402 PERL_UNUSED_ARG(sv);
09fb282d
FC
3403 PERL_UNUSED_ARG(name);
3404 PERL_UNUSED_ARG(namlen);
3405
3406 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3407 nmg = mg_find(nsv, mg->mg_type);
3408 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3409 nmg->mg_ptr = mg->mg_ptr;
3410 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3411 nmg->mg_flags |= MGf_REFCOUNTED;
3412 return 1;
3413}
3414
f747ebd6 3415/*
66610fdd
RGS
3416 * Local variables:
3417 * c-indentation-style: bsd
3418 * c-basic-offset: 4
14d04a33 3419 * indent-tabs-mode: nil
66610fdd
RGS
3420 * End:
3421 *
14d04a33 3422 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3423 */