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[MERGE] fixups for attributes-before-signatures
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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20"Magic" is special data attached to SV structures in order to give them
21"magical" properties. When any Perl code tries to read from, or assign to,
22an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 23with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 24give it a chance to update its internal value (get on $. writes the line
b53c43bf 25number of the last read filehandle into the SV's IV slot), while
166f8a29 26set is called after an SV has been written to, in order to allow it to make
ddfa107c 27use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
28PL_rs global variable).
29
30Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 31SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 32of functions that implement the get(), set(), length() etc functions,
154e47c8 33plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
34a MAGIC structure that contains a pointer to the object associated with the
35tie.
36
7fefc6c1
KW
37=cut
38
ccfc67b7
JH
39*/
40
79072805 41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_MG_C
79072805
LW
43#include "perl.h"
44
5cd24f17 45#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
46# ifdef I_GRP
47# include <grp.h>
48# endif
188ea221
CS
49#endif
50
757f63d8
SP
51#if defined(HAS_SETGROUPS)
52# ifndef NGROUPS
53# define NGROUPS 32
54# endif
55#endif
56
17aa7f3d
JH
57#ifdef __hpux
58# include <sys/pstat.h>
59#endif
60
7636ea95
AB
61#ifdef HAS_PRCTL_SET_NAME
62# include <sys/prctl.h>
63#endif
64
8aad04aa 65#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 66Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 67#else
e69880a5 68Signal_t Perl_csighandler(int sig);
8aad04aa 69#endif
e69880a5 70
9cffb111
OS
71#ifdef __Lynx__
72/* Missing protos on LynxOS */
73void setruid(uid_t id);
74void seteuid(uid_t id);
75void setrgid(uid_t id);
76void setegid(uid_t id);
77#endif
78
c07a80fd 79/*
4bac9ae4 80 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
82 */
83
84struct magic_state {
85 SV* mgs_sv;
455ece5e 86 I32 mgs_ss_ix;
a623f893 87 U32 mgs_flags;
150b625d 88 bool mgs_bumped;
c07a80fd 89};
455ece5e 90/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
91
92STATIC void
ff44333e 93S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
c07a80fd 94{
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d 97
ff44333e 98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 99
4bac9ae4
CS
100 assert(SvMAGICAL(sv));
101
150b625d
DM
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
110 bumped = TRUE;
111 }
8985fe98 112
8772537c 113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
114
115 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 116 mgs->mgs_sv = sv;
a623f893 117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 119 mgs->mgs_bumped = bumped;
c07a80fd 120
ff44333e 121 SvFLAGS(sv) &= ~flags;
3805b5fb 122 SvREADONLY_off(sv);
c07a80fd
PP
123}
124
ff44333e
FC
125#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
126
954c1994
GS
127/*
128=for apidoc mg_magical
129
fbe13c60 130Turns on the magical status of an SV. See C<L</sv_magic>>.
954c1994
GS
131
132=cut
133*/
134
8990e307 135void
ddeaf645 136Perl_mg_magical(SV *sv)
8990e307 137{
e1ec3a88 138 const MAGIC* mg;
7918f24d 139 PERL_ARGS_ASSERT_MG_MAGICAL;
f9c6fee5
CS
140
141 SvMAGICAL_off(sv);
218787bd 142 if ((mg = SvMAGIC(sv))) {
218787bd
VP
143 do {
144 const MGVTBL* const vtbl = mg->mg_virtual;
145 if (vtbl) {
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 SvGMAGICAL_on(sv);
148 if (vtbl->svt_set)
149 SvSMAGICAL_on(sv);
150 if (vtbl->svt_clear)
151 SvRMAGICAL_on(sv);
152 }
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
155 SvRMAGICAL_on(sv);
8990e307
LW
156 }
157}
158
954c1994
GS
159/*
160=for apidoc mg_get
161
4b1e7f06 162Do magic before a value is retrieved from the SV. The type of SV must
796b6530 163be >= C<SVt_PVMG>. See C<L</sv_magic>>.
954c1994
GS
164
165=cut
166*/
167
79072805 168int
864dbfa3 169Perl_mg_get(pTHX_ SV *sv)
79072805 170{
35a4481c 171 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 172 bool saved = FALSE;
f9c6fee5 173 bool have_new = 0;
b949b68f 174 bool taint_only = TRUE; /* the only get method seen is taint */
ff76feab 175 MAGIC *newmg, *head, *cur, *mg;
6683b158 176
7918f24d
NC
177 PERL_ARGS_ASSERT_MG_GET;
178
407287f9
FC
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
180
ff76feab
AMS
181 /* We must call svt_get(sv, mg) for each valid entry in the linked
182 list of magic. svt_get() may delete the current entry, add new
183 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184
185 newmg = cur = head = mg = SvMAGIC(sv);
186 while (mg) {
35a4481c 187 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 189
2b260de0 190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
191
192 /* taint's mg get is so dumb it doesn't need flag saving */
b949b68f
DM
193 if (mg->mg_type != PERL_MAGIC_taint) {
194 taint_only = FALSE;
195 if (!saved) {
196 save_magic(mgs_ix, sv);
197 saved = TRUE;
198 }
199 }
a9844598 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 205 if (!SvMAGIC(sv)) {
a623f893
FC
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 208 break;
f9c6fee5 209 }
b77f7d40 210
f9c6fee5 211 /* recalculate flags if this entry was deleted. */
ff76feab 212 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 215 }
7d1328bb 216 else if (vtbl == &PL_vtbl_utf8) {
b949b68f
DM
217 /* get-magic can reallocate the PV, unless there's only taint
218 * magic */
219 if (taint_only) {
220 MAGIC *mg2;
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
224 && mg2->mg_virtual
225 && mg2->mg_virtual->svt_get
226 ) {
227 taint_only = FALSE;
228 break;
229 }
230 }
231 }
232 if (!taint_only)
233 magic_setutf8(sv, mg);
7d1328bb 234 }
ff76feab 235
f9c6fee5 236 mg = nextmg;
ff76feab 237
0723351e 238 if (have_new) {
ff76feab
AMS
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
241 if (mg == head) {
0723351e 242 have_new = 0;
ff76feab
AMS
243 mg = cur;
244 head = newmg;
245 }
246 }
247
248 /* Were any new entries added? */
0723351e
NC
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
250 have_new = 1;
ff76feab
AMS
251 cur = mg;
252 mg = newmg;
a623f893
FC
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 255 }
79072805 256 }
463ee0b2 257
a9844598
CS
258 if (saved)
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
260
79072805
LW
261 return 0;
262}
263
954c1994
GS
264/*
265=for apidoc mg_set
266
fbe13c60 267Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
268
269=cut
270*/
271
79072805 272int
864dbfa3 273Perl_mg_set(pTHX_ SV *sv)
79072805 274{
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
b5ed8c44
FC
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
282
ff44333e 283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
284
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 286 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 287 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 291 }
e0a73de4 292 if (PL_localizing == 2
b5ed8c44 293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 294 continue;
2b260de0 295 if (vtbl && vtbl->svt_set)
16c91539 296 vtbl->svt_set(aTHX_ sv, mg);
79072805 297 }
463ee0b2 298
8772537c 299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
300 return 0;
301}
302
954c1994
GS
303/*
304=for apidoc mg_length
305
d4e99c76 306Reports on the SV's length in bytes, calling length magic if available,
796b6530 307but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 308magic if there is no 'length' magic, but with no indication as to
796b6530
KW
309whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310higher. Use C<sv_len()> instead.
954c1994
GS
311
312=cut
313*/
314
79072805 315U32
864dbfa3 316Perl_mg_length(pTHX_ SV *sv)
79072805
LW
317{
318 MAGIC* mg;
463ee0b2 319 STRLEN len;
463ee0b2 320
7918f24d
NC
321 PERL_ARGS_ASSERT_MG_LENGTH;
322
79072805 323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 324 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 325 if (vtbl && vtbl->svt_len) {
35a4481c 326 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 327 save_magic(mgs_ix, sv);
a0d0e21e 328 /* omit MGf_GSKIP -- not changed here */
16c91539 329 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
331 return len;
332 }
333 }
334
bd8446cf 335 (void)SvPV_const(sv, len);
463ee0b2 336 return len;
79072805
LW
337}
338
8fb26106 339I32
864dbfa3 340Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
341{
342 MAGIC* mg;
ac27b0f5 343
7918f24d
NC
344 PERL_ARGS_ASSERT_MG_SIZE;
345
93965878 346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 347 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 348 if (vtbl && vtbl->svt_len) {
35a4481c
AL
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
350 I32 len;
455ece5e 351 save_magic(mgs_ix, sv);
93965878 352 /* omit MGf_GSKIP -- not changed here */
16c91539 353 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
355 return len;
356 }
357 }
358
359 switch(SvTYPE(sv)) {
360 case SVt_PVAV:
502c6561 361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
362 case SVt_PVHV:
363 /* FIXME */
364 default:
cea2e8a9 365 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 366
93965878 367 }
a25b5927 368 NOT_REACHED; /* NOTREACHED */
93965878
NIS
369}
370
954c1994
GS
371/*
372=for apidoc mg_clear
373
fbe13c60 374Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
375
376=cut
377*/
378
79072805 379int
864dbfa3 380Perl_mg_clear(pTHX_ SV *sv)
79072805 381{
35a4481c 382 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 383 MAGIC* mg;
8ac77ac9 384 MAGIC *nextmg;
463ee0b2 385
7918f24d
NC
386 PERL_ARGS_ASSERT_MG_CLEAR;
387
455ece5e 388 save_magic(mgs_ix, sv);
463ee0b2 389
8ac77ac9 390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 391 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 392 /* omit GSKIP -- never set here */
727405f8 393
8ac77ac9
NC
394 nextmg = mg->mg_moremagic; /* it may delete itself */
395
2b260de0 396 if (vtbl && vtbl->svt_clear)
16c91539 397 vtbl->svt_clear(aTHX_ sv, mg);
79072805 398 }
463ee0b2 399
8772537c 400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
401 return 0;
402}
403
ed624ca8 404static MAGIC*
ddeaf645 405S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 406{
39de7f53
FR
407 assert(flags <= 1);
408
409 if (sv) {
410 MAGIC *mg;
411
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
414 return mg;
415 }
416 }
417 }
418
419 return NULL;
420}
421
954c1994
GS
422/*
423=for apidoc mg_find
424
796b6530 425Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
426
427=cut
428*/
429
93a17b20 430MAGIC*
ddeaf645 431Perl_mg_find(const SV *sv, int type)
93a17b20 432{
ddeaf645 433 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
434}
435
436/*
437=for apidoc mg_findext
438
439Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 440C<L</sv_magicext>>.
39de7f53
FR
441
442=cut
443*/
444
445MAGIC*
ddeaf645 446Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 447{
ddeaf645 448 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
449}
450
96c2a8ff
FC
451MAGIC *
452Perl_mg_find_mglob(pTHX_ SV *sv)
453{
454 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
455 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
456 /* This sv is only a delegate. //g magic must be attached to
457 its target. */
458 vivify_defelem(sv);
459 sv = LvTARG(sv);
460 }
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
463 return NULL;
464}
465
954c1994
GS
466/*
467=for apidoc mg_copy
468
fbe13c60 469Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
470
471=cut
472*/
473
79072805 474int
864dbfa3 475Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 476{
463ee0b2 477 int count = 0;
79072805 478 MAGIC* mg;
7918f24d
NC
479
480 PERL_ARGS_ASSERT_MG_COPY;
481
463ee0b2 482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 483 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 486 }
823a54a3
AL
487 else {
488 const char type = mg->mg_type;
1e73acc8 489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
490 sv_magic(nsv,
491 (type == PERL_MAGIC_tied)
492 ? SvTIED_obj(sv, mg)
27deb0cf 493 : mg->mg_obj,
823a54a3
AL
494 toLOWER(type), key, klen);
495 count++;
496 }
79072805 497 }
79072805 498 }
463ee0b2 499 return count;
79072805
LW
500}
501
954c1994 502/*
0cbee0a4
DM
503=for apidoc mg_localize
504
9711599e 505Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW
506SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507gets copied, value magic doesn't (I<e.g.>,
796b6530 508C<taint>, C<pos>).
9711599e 509
796b6530 510If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 511This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 512and that will handle the magic.
0cbee0a4
DM
513
514=cut
515*/
516
517void
af7df257 518Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
519{
520 MAGIC *mg;
7918f24d
NC
521
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
523
658a9f31
JD
524 if (nsv == DEFSV)
525 return;
526
0cbee0a4 527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 528 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 530 continue;
0cbee0a4 531
a5063e7c 532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 533 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 534 else
0cbee0a4
DM
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
a5063e7c 537
0cbee0a4 538 /* container types should remain read-only across localization */
9ff3e6d8 539 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
540 }
541
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 544 if (setmagic) {
9711599e
CS
545 PL_localizing = 1;
546 SvSETMAGIC(nsv);
547 PL_localizing = 0;
548 }
0cbee0a4
DM
549 }
550}
551
d9088386
Z
552#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
553static void
554S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
555{
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
559 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
564 }
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
567 Safefree(mg);
568}
569
0cbee0a4 570/*
954c1994
GS
571=for apidoc mg_free
572
fbe13c60 573Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
574
575=cut
576*/
577
79072805 578int
864dbfa3 579Perl_mg_free(pTHX_ SV *sv)
79072805
LW
580{
581 MAGIC* mg;
582 MAGIC* moremagic;
7918f24d
NC
583
584 PERL_ARGS_ASSERT_MG_FREE;
585
79072805 586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 587 moremagic = mg->mg_moremagic;
d9088386 588 mg_free_struct(sv, mg);
c826f41b 589 SvMAGIC_set(sv, moremagic);
79072805 590 }
b162af07 591 SvMAGIC_set(sv, NULL);
68f8932e 592 SvMAGICAL_off(sv);
79072805
LW
593 return 0;
594}
595
d9088386
Z
596/*
597=for apidoc Am|void|mg_free_type|SV *sv|int how
598
2d7f6611 599Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z
600
601=cut
602*/
603
604void
605Perl_mg_free_type(pTHX_ SV *sv, int how)
606{
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
d9088386
Z
610 moremg = mg->mg_moremagic;
611 if (mg->mg_type == how) {
19742f39 612 MAGIC *newhead;
d9088386
Z
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
615 if (prevmg) {
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
618 SvMAGIC_set(sv, mg);
619 }
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
623 mg = prevmg;
624 }
625 }
626 mg_magical(sv);
627}
628
e0d4aead
TC
629/*
630=for apidoc mg_freeext
631
632Remove any magic of type C<how> using virtual table C<vtbl> from the
633SV C<sv>. See L</sv_magic>.
634
635C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
636
637=cut
638*/
639
640void
641Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
642{
643 MAGIC *mg, *prevmg, *moremg;
644 PERL_ARGS_ASSERT_MG_FREEEXT;
645 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
646 MAGIC *newhead;
647 moremg = mg->mg_moremagic;
648 if (mg->mg_type == how && (vtbl == NULL || mg->mg_virtual == vtbl)) {
649 /* temporarily move to the head of the magic chain, in case
650 custom free code relies on this historical aspect of mg_free */
651 if (prevmg) {
652 prevmg->mg_moremagic = moremg;
653 mg->mg_moremagic = SvMAGIC(sv);
654 SvMAGIC_set(sv, mg);
655 }
656 newhead = mg->mg_moremagic;
657 mg_free_struct(sv, mg);
658 SvMAGIC_set(sv, newhead);
659 mg = prevmg;
660 }
661 }
662 mg_magical(sv);
663}
664
79072805 665#include <signal.h>
79072805 666
942e002e 667U32
864dbfa3 668Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 669{
8772537c 670 PERL_UNUSED_ARG(sv);
6cef1e77 671
7918f24d
NC
672 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
673
0bd48802 674 if (PL_curpm) {
27deb0cf 675 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 676 if (rx) {
fa531f32
DM
677 const SSize_t n = (SSize_t)mg->mg_obj;
678 if (n == '+') { /* @+ */
a678b0e4 679 /* return the number possible */
07bc277f 680 return RX_NPARENS(rx);
27deb0cf 681 } else { /* @- @^CAPTURE @{^CAPTURE} */
07bc277f 682 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
683
684 /* return the last filled */
f46c4081 685 while ( paren >= 0
07bc277f
NC
686 && (RX_OFFS(rx)[paren].start == -1
687 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 688 paren--;
fa531f32 689 if (n == '-') {
27deb0cf
YO
690 /* @- */
691 return (U32)paren;
692 } else {
693 /* @^CAPTURE @{^CAPTURE} */
694 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
695 }
696 }
0bd48802 697 }
8f580fb8 698 }
ac27b0f5 699
942e002e 700 return (U32)-1;
6cef1e77
IZ
701}
702
6502e081
DM
703/* @-, @+ */
704
6cef1e77 705int
864dbfa3 706Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 707{
7918f24d
NC
708 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
709
0bd48802 710 if (PL_curpm) {
27deb0cf 711 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 712 if (rx) {
fa531f32 713 const SSize_t n = (SSize_t)mg->mg_obj;
27deb0cf
YO
714 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
715 const I32 paren = mg->mg_len
fa531f32 716 + (n == '\003' ? 1 : 0);
a10eae29
FC
717 SSize_t s;
718 SSize_t t;
0bd48802
AL
719 if (paren < 0)
720 return 0;
07bc277f
NC
721 if (paren <= (I32)RX_NPARENS(rx) &&
722 (s = RX_OFFS(rx)[paren].start) != -1 &&
723 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 724 {
a10eae29 725 SSize_t i;
27deb0cf 726
fa531f32 727 if (n == '+') /* @+ */
0bd48802 728 i = t;
fa531f32 729 else if (n == '-') /* @- */
0bd48802 730 i = s;
27deb0cf
YO
731 else { /* @^CAPTURE @{^CAPTURE} */
732 CALLREG_NUMBUF_FETCH(rx,paren,sv);
733 return 0;
734 }
0bd48802 735
a10eae29 736 if (RX_MATCH_UTF8(rx)) {
07bc277f 737 const char * const b = RX_SUBBEG(rx);
0bd48802 738 if (b)
6502e081
DM
739 i = RX_SUBCOFFSET(rx) +
740 utf8_length((U8*)b,
741 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 742 }
727405f8 743
a10eae29 744 sv_setuv(sv, i);
232af1f8 745 return 0;
1aa99e6b 746 }
0bd48802 747 }
6cef1e77 748 }
3773545d 749 sv_set_undef(sv);
6cef1e77
IZ
750 return 0;
751}
752
6502e081
DM
753/* @-, @+ */
754
e4b89193 755int
a29d06ed
MG
756Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
757{
7918f24d 758 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 759 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
760 PERL_UNUSED_ARG(sv);
761 PERL_UNUSED_ARG(mg);
cb077ed2 762 Perl_croak_no_modify();
0dbb1585 763 NORETURN_FUNCTION_END;
a29d06ed
MG
764}
765
ad3296c6 766#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
767 if (SvPOK(sv)) { \
768 STRLEN len = SvCUR(sv); \
769 char * const p = SvPVX(sv); \
8e6b4db6
PC
770 while (len > 0 && isSPACE(p[len-1])) \
771 --len; \
772 SvCUR_set(sv, len); \
773 p[len] = '\0'; \
774 } \
ad3296c6
SH
775} STMT_END
776
8b850bd5
NC
777void
778Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
779{
7918f24d
NC
780 PERL_ARGS_ASSERT_EMULATE_COP_IO;
781
8b850bd5 782 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
e03e82a0 783 sv_set_undef(sv);
8b850bd5 784 else {
b2aed775 785 SvPVCLEAR(sv);
8b850bd5
NC
786 SvUTF8_off(sv);
787 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 788 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
789 assert(value);
790 sv_catsv(sv, value);
791 }
792 sv_catpvs(sv, "\0");
793 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 794 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
795 assert(value);
796 sv_catsv(sv, value);
797 }
798 }
799}
800
d9fe7d23
KW
801STATIC void
802S_fixup_errno_string(pTHX_ SV* sv)
803{
804 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
805 * Perl space. */
806
807 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
808
809 assert(SvOK(sv));
b35e4f8b
KW
810
811 if(strEQ(SvPVX(sv), "")) {
812 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
813 }
814 else {
d9fe7d23 815
d3c0b317
KW
816 /* In some locales the error string may come back as UTF-8, in which
817 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
818 * avoid as many possible backward compatibility issues as possible, we
819 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87 820 * an entirely invariant string. We assume that if the string looks
fab19207
KW
821 * like UTF-8 in a single script, it really is UTF-8: "text in any
822 * other encoding that uses bytes with the high bit set is extremely
823 * unlikely to pass a UTF-8 validity test"
9f10db87
KW
824 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
825 * potential that we will get it wrong however, especially on short
a8f4b0c6 826 * error message text, so do an additional check. */
027a0d26
KW
827 if ( ! IN_BYTES /* respect 'use bytes' */
828 && is_utf8_non_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
a8f4b0c6
KW
829
830#ifdef USE_LOCALE_MESSAGES
831
61520eee 832 && _is_cur_LC_category_utf8(LC_MESSAGES)
a8f4b0c6 833
fab19207
KW
834#else /* If can't check directly, at least can see if script is consistent,
835 under UTF-8, which gives us an extra measure of confidence. */
836
837 && isSCRIPT_RUN((const U8 *) SvPVX_const(sv), (U8 *) SvEND(sv),
838 TRUE, /* Means assume UTF-8 */
839 NULL)
a8f4b0c6
KW
840#endif
841
842 ) {
d3c0b317
KW
843 SvUTF8_on(sv);
844 }
b35e4f8b 845 }
d9fe7d23
KW
846}
847
658db622
Z
848/*
849=for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
850
851Generates the message string describing an OS error and returns it as
852an SV. C<errnum> must be a value that C<errno> could take, identifying
853the type of error.
854
855If C<tgtsv> is non-null then the string will be written into that SV
856(overwriting existing content) and it will be returned. If C<tgtsv>
857is a null pointer then the string will be written into a new mortal SV
858which will be returned.
859
860The message will be taken from whatever locale would be used by C<$!>,
861and will be encoded in the SV in whatever manner would be used by C<$!>.
862The details of this process are subject to future change. Currently,
863the message is taken from the C locale by default (usually producing an
864English message), and from the currently selected locale when in the scope
865of the C<use locale> pragma. A heuristic attempt is made to decode the
866message from the locale's character encoding, but it will only be decoded
867as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
868locale, usually in an ISO-8859-1 locale, and never in any other locale.
869
870The SV is always returned containing an actual string, and with no other
871OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
872(meaning success), and if no useful message is available then a useless
873string (currently empty) is returned.
874
875=cut
876*/
877
878SV *
879Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
880{
881 char const *errstr;
882 if(!tgtsv)
883 tgtsv = sv_newmortal();
884 errstr = my_strerror(errnum);
885 if(errstr) {
886 sv_setpv(tgtsv, errstr);
887 fixup_errno_string(tgtsv);
888 } else {
889 SvPVCLEAR(tgtsv);
890 }
891 return tgtsv;
892}
893
25bbd826
CB
894#ifdef VMS
895#include <descrip.h>
896#include <starlet.h>
897#endif
898
79072805 899int
864dbfa3 900Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 901{
eb578fdb
KW
902 I32 paren;
903 const char *s = NULL;
904 REGEXP *rx;
823a54a3 905 const char * const remaining = mg->mg_ptr + 1;
e91d8259 906 char nextchar;
79072805 907
7918f24d
NC
908 PERL_ARGS_ASSERT_MAGIC_GET;
909
e91d8259 910 if (!mg->mg_ptr) {
e91d8259 911 paren = mg->mg_len;
e91d8259 912 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 913 do_numbuf_fetch:
e91d8259 914 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 915 }
e03e82a0
DM
916 else
917 goto set_undef;
e91d8259
NC
918 return 0;
919 }
920
921 nextchar = *remaining;
79072805 922 switch (*mg->mg_ptr) {
748a9306 923 case '\001': /* ^A */
f2da823f 924 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
925 else
926 sv_set_undef(sv);
125b9982
NT
927 if (SvTAINTED(PL_bodytarget))
928 SvTAINTED_on(sv);
748a9306 929 break;
e5218da5 930 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 931 if (nextchar == '\0') {
e5218da5
GA
932 sv_setiv(sv, (IV)PL_minus_c);
933 }
823a54a3 934 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
935 sv_setiv(sv, (IV)STATUS_NATIVE);
936 }
49460fe6
NIS
937 break;
938
79072805 939 case '\004': /* ^D */
aea4f609 940 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 941 break;
28f23441 942 case '\005': /* ^E */
6c6eab55
KW
943 if (nextchar != '\0') {
944 if (strEQ(remaining, "NCODING"))
3773545d 945 sv_set_undef(sv);
4f4ff3a7 946 break;
6c6eab55 947 }
4f4ff3a7
KW
948
949#if defined(VMS) || defined(OS2) || defined(WIN32)
950# if defined(VMS)
2a99ff86
KW
951 {
952 char msg[255];
953 $DESCRIPTOR(msgdsc,msg);
954 sv_setnv(sv,(NV) vaxc$errno);
955 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
956 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
957 else
b2aed775 958 SvPVCLEAR(sv);
2a99ff86 959 }
4b645107 960#elif defined(OS2)
2a99ff86
KW
961 if (!(_emx_env & 0x200)) { /* Under DOS */
962 sv_setnv(sv, (NV)errno);
2c6ee1a7 963 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
964 } else {
965 if (errno != errno_isOS2) {
966 const int tmp = _syserrno();
967 if (tmp) /* 2nd call to _syserrno() makes it 0 */
968 Perl_rc = tmp;
969 }
970 sv_setnv(sv, (NV)Perl_rc);
971 sv_setpv(sv, os2error(Perl_rc));
972 }
1534c6f5 973 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
974 fixup_errno_string(sv);
975 }
4f4ff3a7 976# elif defined(WIN32)
2a99ff86
KW
977 {
978 const DWORD dwErr = GetLastError();
979 sv_setnv(sv, (NV)dwErr);
980 if (dwErr) {
981 PerlProc_GetOSError(sv, dwErr);
2efab60d 982 fixup_errno_string(sv);
2a99ff86
KW
983 }
984 else
b2aed775 985 SvPVCLEAR(sv);
2a99ff86
KW
986 SetLastError(dwErr);
987 }
4f4ff3a7
KW
988# else
989# error Missing code for platform
990# endif
2a99ff86
KW
991 SvRTRIM(sv);
992 SvNOK_on(sv); /* what a wonderful hack! */
993 break;
4f4ff3a7
KW
994#endif /* End of platforms with special handling for $^E; others just fall
995 through to $! */
2165bd23 996 /* FALLTHROUGH */
46f3e16c
KW
997
998 case '!':
999 {
5f1b979d 1000 dSAVE_ERRNO;
46f3e16c 1001#ifdef VMS
5f1b979d 1002 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 1003#else
5f1b979d 1004 sv_setnv(sv, (NV)errno);
46f3e16c
KW
1005#endif
1006#ifdef OS2
5f1b979d
KW
1007 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1008 sv_setpv(sv, os2error(Perl_rc));
1009 else
46f3e16c 1010#endif
5f1b979d 1011 if (! errno) {
b2aed775 1012 SvPVCLEAR(sv);
46f3e16c 1013 }
5f1b979d 1014 else {
658db622
Z
1015 sv_string_from_errnum(errno, sv);
1016 /* If no useful string is available, don't
1017 * claim to have a string part. The SvNOK_on()
5f1b979d 1018 * below will cause just the number part to be valid */
658db622
Z
1019 if (!SvCUR(sv))
1020 SvPOK_off(sv);
5f1b979d
KW
1021 }
1022 RESTORE_ERRNO;
46f3e16c
KW
1023 }
1024
1025 SvRTRIM(sv);
1026 SvNOK_on(sv); /* what a wonderful hack! */
1027 break;
1028
79072805 1029 case '\006': /* ^F */
3280af22 1030 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 1031 break;
9ebf26ad
FR
1032 case '\007': /* ^GLOBAL_PHASE */
1033 if (strEQ(remaining, "LOBAL_PHASE")) {
1034 sv_setpvn(sv, PL_phase_names[PL_phase],
1035 strlen(PL_phase_names[PL_phase]));
1036 }
1037 break;
a0d0e21e 1038 case '\010': /* ^H */
5d382c25 1039 sv_setuv(sv, PL_hints);
a0d0e21e 1040 break;
9d116dd7 1041 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1042 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1043 break;
8561ea1d
FC
1044 case '\014': /* ^LAST_FH */
1045 if (strEQ(remaining, "AST_FH")) {
745e740c 1046 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1047 assert(isGV_with_GP(PL_last_in_gv));
1048 SV_CHECK_THINKFIRST_COW_DROP(sv);
1049 prepare_SV_for_RV(sv);
1050 SvOK_off(sv);
1051 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1052 SvROK_on(sv);
1053 sv_rvweaken(sv);
1054 }
3773545d
DM
1055 else
1056 sv_set_undef(sv);
8561ea1d
FC
1057 }
1058 break;
ac27b0f5 1059 case '\017': /* ^O & ^OPEN */
823a54a3 1060 if (nextchar == '\0') {
ac27b0f5 1061 sv_setpv(sv, PL_osname);
3511154c
DM
1062 SvTAINTED_off(sv);
1063 }
823a54a3 1064 else if (strEQ(remaining, "PEN")) {
8b850bd5 1065 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1066 }
28f23441 1067 break;
9ebf26ad 1068 case '\020':
a6d0b1b5 1069 sv_setiv(sv, (IV)PL_perldb);
79072805 1070 break;
fb73857a 1071 case '\023': /* ^S */
f512d242 1072 if (nextchar == '\0') {
bc177e6b 1073 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1074 SvOK_off(sv);
3280af22 1075 else if (PL_in_eval)
6dc8a9e4 1076 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1077 else
1078 sv_setiv(sv, 0);
d58bf5aa 1079 }
f512d242
KW
1080 else if (strEQ(remaining, "AFE_LOCALES")) {
1081
1082#if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1083
1084 sv_setuv(sv, (UV) 1);
1085
1086#else
1087 sv_setuv(sv, (UV) 0);
1088
1089#endif
1090
1091 }
fb73857a 1092 break;
79072805 1093 case '\024': /* ^T */
823a54a3 1094 if (nextchar == '\0') {
88e89b8a 1095#ifdef BIG_TIME
7c36658b 1096 sv_setnv(sv, PL_basetime);
88e89b8a 1097#else
7c36658b 1098 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1099#endif
7c36658b 1100 }
823a54a3 1101 else if (strEQ(remaining, "AINT"))
284167a5
SM
1102 sv_setiv(sv, TAINTING_get
1103 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1104 : 0);
7c36658b 1105 break;
e07ea26a 1106 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1107 if (strEQ(remaining, "NICODE"))
a05d7ebb 1108 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1109 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1110 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1111 else if (strEQ(remaining, "TF8CACHE"))
1112 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1113 break;
1114 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1115 if (nextchar == '\0')
8298454c 1116 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1117 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1118 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1119 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1120 }
1121 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1122 goto set_undef;
013b78e8 1123 }
d3a7d8c7 1124 else if (PL_compiling.cop_warnings == pWARN_ALL) {
006c1a1d 1125 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1126 }
4438c4b7 1127 else {
72dc9ed5
NC
1128 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1129 *PL_compiling.cop_warnings);
ac27b0f5 1130 }
4438c4b7 1131 }
8ca2a5d6
DD
1132#ifdef WIN32
1133 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1134 sv_setiv(sv, w32_sloppystat);
1135 }
1136#endif
79072805 1137 break;
79072805 1138 case '+':
aaa362c4 1139 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1140 paren = RX_LASTPAREN(rx);
1141 if (paren)
1142 goto do_numbuf_fetch;
79072805 1143 }
e03e82a0 1144 goto set_undef;
a01268b5
JH
1145 case '\016': /* ^N */
1146 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1147 paren = RX_LASTCLOSEPAREN(rx);
1148 if (paren)
1149 goto do_numbuf_fetch;
a01268b5 1150 }
e03e82a0 1151 goto set_undef;
79072805 1152 case '.':
3280af22 1153 if (GvIO(PL_last_in_gv)) {
357c8808 1154 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1155 }
79072805
LW
1156 break;
1157 case '?':
809a5acc 1158 {
809a5acc 1159 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1160#ifdef COMPLEX_STATUS
41cb7b2b 1161 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1162 LvTARGOFF(sv) = PL_statusvalue;
1163 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1164#endif
809a5acc 1165 }
79072805
LW
1166 break;
1167 case '^':
acbe1b9d 1168 if (GvIOp(PL_defoutgv))
099be4f1 1169 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1170 if (s)
1171 sv_setpv(sv,s);
1172 else {
3280af22 1173 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1174 sv_catpvs(sv,"_TOP");
79072805
LW
1175 }
1176 break;
1177 case '~':
acbe1b9d 1178 if (GvIOp(PL_defoutgv))
0daa599b 1179 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1180 if (!s)
3280af22 1181 s = GvENAME(PL_defoutgv);
79072805
LW
1182 sv_setpv(sv,s);
1183 break;
79072805 1184 case '=':
099be4f1 1185 if (GvIO(PL_defoutgv))
0daa599b 1186 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1187 break;
1188 case '-':
099be4f1 1189 if (GvIO(PL_defoutgv))
0daa599b 1190 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1191 break;
1192 case '%':
099be4f1 1193 if (GvIO(PL_defoutgv))
0daa599b 1194 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1195 break;
79072805 1196 case ':':
79072805
LW
1197 case '/':
1198 break;
1199 case '[':
e1dccc0d 1200 sv_setiv(sv, 0);
79072805
LW
1201 break;
1202 case '|':
099be4f1 1203 if (GvIO(PL_defoutgv))
0daa599b 1204 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1205 break;
79072805 1206 case '\\':
b2ce0fda 1207 if (PL_ors_sv)
f28098ff 1208 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1209 else
e03e82a0 1210 goto set_undef;
79072805 1211 break;
0e219455 1212 case '$': /* $$ */
9cdac2a2
FC
1213 {
1214 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1215 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1216 /* never set manually, or at least not since last fork */
1217 sv_setiv(sv, pid);
19db9fb7
Z
1218 /* never unsafe, even if reading in a tainted expression */
1219 SvTAINTED_off(sv);
1220 }
9cdac2a2
FC
1221 /* else a value has been assigned manually, so do nothing */
1222 }
0e219455 1223 break;
79072805 1224 case '<':
dfff4baf 1225 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1226 break;
1227 case '>':
dfff4baf 1228 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1229 break;
1230 case '(':
dfff4baf 1231 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1232 goto add_groups;
1233 case ')':
dfff4baf 1234 sv_setgid(sv, PerlProc_getegid());
79072805 1235 add_groups:
79072805 1236#ifdef HAS_GETGROUPS
79072805 1237 {
57d7c65e 1238 Groups_t *gary = NULL;
375ed12a
JH
1239 I32 num_groups = getgroups(0, gary);
1240 if (num_groups > 0) {
19742f39 1241 I32 i;
375ed12a
JH
1242 Newx(gary, num_groups, Groups_t);
1243 num_groups = getgroups(num_groups, gary);
1244 for (i = 0; i < num_groups; i++)
147e3846 1245 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1246 Safefree(gary);
1247 }
79072805 1248 }
155aba94 1249 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1250#endif
79072805 1251 break;
79072805
LW
1252 case '0':
1253 break;
1254 }
a0d0e21e 1255 return 0;
e03e82a0
DM
1256
1257 set_undef:
1258 sv_set_undef(sv);
1259 return 0;
79072805
LW
1260}
1261
1262int
864dbfa3 1263Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1264{
8772537c 1265 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1266
7918f24d
NC
1267 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1268
79072805 1269 if (uf && uf->uf_val)
24f81a43 1270 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1271 return 0;
1272}
1273
1274int
864dbfa3 1275Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1276{
9ae3433d 1277 STRLEN len = 0, klen;
12033064 1278 const char * const key = MgPV_const(mg,klen);
888a67f6 1279 const char *s = "";
1e422769 1280
7918f24d
NC
1281 PERL_ARGS_ASSERT_MAGIC_SETENV;
1282
613c63b4 1283 SvGETMAGIC(sv);
12033064 1284 if (SvOK(sv)) {
613c63b4
CS
1285 /* defined environment variables are byte strings; unfortunately
1286 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1287 (void)SvPV_force_nomg_nolen(sv);
1288 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1289 if (SvUTF8(sv)) {
1290 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1291 SvUTF8_off(sv);
1292 }
1293 s = SvPVX(sv);
1294 len = SvCUR(sv);
12033064
CS
1295 }
1296 my_setenv(key, s); /* does the deed */
1297
a0d0e21e
LW
1298#ifdef DYNAMIC_ENV_FETCH
1299 /* We just undefd an environment var. Is a replacement */
1300 /* waiting in the wings? */
1301 if (!len) {
6bd66ee9 1302 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1303 if (valp)
4ab59fcc 1304 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1305 }
1306#endif
1e422769 1307
28542d8f 1308#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1309 /* And you'll never guess what the dog had */
1310 /* in its mouth... */
284167a5 1311 if (TAINTING_get) {
1e422769
PP
1312 MgTAINTEDDIR_off(mg);
1313#ifdef VMS
b2aed775 1314 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1315 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1316 int i = 0, j = 0;
1317
6fca0082 1318 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1319 elt = eltbuf;
1e422769
PP
1320 do { /* DCL$PATH may be a search list */
1321 while (1) { /* as may dev portion of any element */
1322 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1323 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1324 cando_by_name(S_IWUSR,0,elt) ) {
1325 MgTAINTEDDIR_on(mg);
1326 return 0;
1327 }
1328 }
bd61b366 1329 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1330 *cp = '\0';
1331 if (my_trnlnm(elt, eltbuf, j++))
1332 elt = eltbuf;
1333 else
1334 break;
1335 }
1336 j = 0;
1337 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1338 }
1339#endif /* VMS */
b2aed775 1340 if (s && memEQs(key, klen, "PATH")) {
8772537c 1341 const char * const strend = s + len;
463ee0b2 1342
70b484a8
DM
1343 /* set MGf_TAINTEDDIR if any component of the new path is
1344 * relative or world-writeable */
463ee0b2 1345 while (s < strend) {
96827780 1346 char tmpbuf[256];
c623ac67 1347 Stat_t st;
5f74f29c 1348 I32 i;
83269ced
CB
1349#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1350 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1351#else
1352 const char path_sep = ':';
1353#endif
ba0a4150 1354 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1355 s, strend, path_sep, &i);
463ee0b2 1356 s++;
bb7a0f54 1357 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1358#ifdef __VMS
1359 /* no colon thus no device name -- assume relative path */
1360 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1361 /* Using Unix separator, e.g. under bash, so act line Unix */
1362 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1363#else
1364 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1365#endif
c6ed36e1 1366 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1367 MgTAINTEDDIR_on(mg);
1e422769
PP
1368 return 0;
1369 }
463ee0b2 1370 }
79072805
LW
1371 }
1372 }
28542d8f 1373#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1374
79072805
LW
1375 return 0;
1376}
1377
1378int
864dbfa3 1379Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1380{
7918f24d 1381 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1382 PERL_UNUSED_ARG(sv);
bd61b366 1383 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1384 return 0;
1385}
1386
88e89b8a 1387int
864dbfa3 1388Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1389{
7918f24d 1390 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1391 PERL_UNUSED_ARG(mg);
b0269e46 1392#if defined(VMS)
cea2e8a9 1393 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1394#else
3280af22 1395 if (PL_localizing) {
fb73857a 1396 HE* entry;
b0269e46 1397 my_clearenv();
85fbaab2
NC
1398 hv_iterinit(MUTABLE_HV(sv));
1399 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1400 I32 keylen;
1401 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1402 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1403 }
1404 }
1405#endif
1406 return 0;
1407}
1408
1409int
864dbfa3 1410Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1411{
7918f24d 1412 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1413 PERL_UNUSED_ARG(sv);
1414 PERL_UNUSED_ARG(mg);
b0269e46
AB
1415#if defined(VMS)
1416 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1417#else
1418 my_clearenv();
1419#endif
3e3baf6d 1420 return 0;
66b1d557
HM
1421}
1422
64ca3a65 1423#ifndef PERL_MICRO
2d4fcd5e
AJ
1424#ifdef HAS_SIGPROCMASK
1425static void
1426restore_sigmask(pTHX_ SV *save_sv)
1427{
0bd48802 1428 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1429 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1430}
1431#endif
66b1d557 1432int
864dbfa3 1433Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1434{
88e89b8a 1435 /* Are we fetching a signal entry? */
708854f2 1436 int i = (I16)mg->mg_private;
7918f24d
NC
1437
1438 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1439
708854f2 1440 if (!i) {
84c7b88c
BF
1441 STRLEN siglen;
1442 const char * sig = MgPV_const(mg, siglen);
1443 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1444 }
1445
e02bfb16 1446 if (i > 0) {
22c35a8c
GS
1447 if(PL_psig_ptr[i])
1448 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1449 else {
46da273f 1450 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1451#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1452 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1453 sigstate = SIG_IGN;
2e34cc90
CL
1454#endif
1455#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1456 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1457 sigstate = SIG_DFL;
85b332e2 1458#endif
88e89b8a 1459 /* cache state so we don't fetch it again */
8aad04aa 1460 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1461 sv_setpvs(sv,"IGNORE");
88e89b8a 1462 else
e03e82a0 1463 sv_set_undef(sv);
46da273f 1464 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1465 SvTEMP_off(sv);
1466 }
1467 }
1468 return 0;
1469}
1470int
864dbfa3 1471Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1472{
7918f24d 1473 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1474
38a124f0 1475 magic_setsig(NULL, mg);
179c85a2 1476 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1477}
3d37d572 1478
0a8e0eff 1479Signal_t
8aad04aa 1480#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1481Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1482#else
0a8e0eff 1483Perl_csighandler(int sig)
8aad04aa 1484#endif
0a8e0eff 1485{
1018e26f
NIS
1486#ifdef PERL_GET_SIG_CONTEXT
1487 dTHXa(PERL_GET_SIG_CONTEXT);
1488#else
85b332e2
CL
1489 dTHX;
1490#endif
1271a1be 1491#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1492#if defined(__cplusplus) && defined(__GNUC__)
1493 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1494 * parameters would be warned about. */
1495 PERL_UNUSED_ARG(sip);
1496 PERL_UNUSED_ARG(uap);
1497#endif
1271a1be 1498#endif
23ada85b 1499#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1500 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1501 if (PL_sig_ignoring[sig]) return;
85b332e2 1502#endif
2e34cc90 1503#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1504 if (PL_sig_defaulting[sig])
2e34cc90
CL
1505#ifdef KILL_BY_SIGPRC
1506 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1507#else
1508 exit(1);
1509#endif
1510#endif
406878dd 1511 if (
853d2c32
RGS
1512#ifdef SIGILL
1513 sig == SIGILL ||
1514#endif
1515#ifdef SIGBUS
1516 sig == SIGBUS ||
1517#endif
1518#ifdef SIGSEGV
1519 sig == SIGSEGV ||
1520#endif
1521 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1522 /* Call the perl level handler now--
31c91b43 1523 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1524#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1525 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1526#else
1527 (*PL_sighandlerp)(sig);
92807b6d 1528#endif
406878dd 1529 else {
31c91b43 1530 if (!PL_psig_pend) return;
406878dd
GA
1531 /* Set a flag to say this signal is pending, that is awaiting delivery after
1532 * the current Perl opcode completes */
1533 PL_psig_pend[sig]++;
1534
1535#ifndef SIG_PENDING_DIE_COUNT
1536# define SIG_PENDING_DIE_COUNT 120
1537#endif
fe13d51d 1538 /* Add one to say _a_ signal is pending */
406878dd
GA
1539 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1540 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1541 (unsigned long)SIG_PENDING_DIE_COUNT);
1542 }
0a8e0eff
NIS
1543}
1544
2e34cc90
CL
1545#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1546void
1547Perl_csighandler_init(void)
1548{
1549 int sig;
27da23d5 1550 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1551
1552 for (sig = 1; sig < SIG_SIZE; sig++) {
1553#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1554 dTHX;
27da23d5 1555 PL_sig_defaulting[sig] = 1;
5c1546dc 1556 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1557#endif
1558#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1559 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1560#endif
1561 }
27da23d5 1562 PL_sig_handlers_initted = 1;
2e34cc90
CL
1563}
1564#endif
1565
7fe50b8b
LT
1566#if defined HAS_SIGPROCMASK
1567static void
1568unblock_sigmask(pTHX_ void* newset)
1569{
dc3bf405 1570 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1571 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1572}
1573#endif
1574
0a8e0eff
NIS
1575void
1576Perl_despatch_signals(pTHX)
1577{
1578 int sig;
1579 PL_sig_pending = 0;
1580 for (sig = 1; sig < SIG_SIZE; sig++) {
1581 if (PL_psig_pend[sig]) {
d0166017 1582 dSAVE_ERRNO;
7fe50b8b 1583#ifdef HAS_SIGPROCMASK
55534442
LT
1584 /* From sigaction(2) (FreeBSD man page):
1585 * | Signal routines normally execute with the signal that
1586 * | caused their invocation blocked, but other signals may
1587 * | yet occur.
1588 * Emulation of this behavior (from within Perl) is enabled
1589 * using sigprocmask
1590 */
1591 int was_blocked;
1592 sigset_t newset, oldset;
1593
1594 sigemptyset(&newset);
1595 sigaddset(&newset, sig);
1596 sigprocmask(SIG_BLOCK, &newset, &oldset);
1597 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1598 if (!was_blocked) {
1599 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1600 ENTER;
1601 SAVEFREESV(save_sv);
1602 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1603 }
55534442 1604#endif
25da4428 1605 PL_psig_pend[sig] = 0;
6e324d09 1606#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1607 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1608#else
1609 (*PL_sighandlerp)(sig);
92807b6d 1610#endif
7fe50b8b 1611#ifdef HAS_SIGPROCMASK
55534442 1612 if (!was_blocked)
7fe50b8b 1613 LEAVE;
55534442 1614#endif
d0166017 1615 RESTORE_ERRNO;
0a8e0eff
NIS
1616 }
1617 }
1618}
1619
38a124f0 1620/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1621int
864dbfa3 1622Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1623{
27da23d5 1624 dVAR;
79072805 1625 I32 i;
cbbf8932 1626 SV** svp = NULL;
2d4fcd5e
AJ
1627 /* Need to be careful with SvREFCNT_dec(), because that can have side
1628 * effects (due to closures). We must make sure that the new disposition
1629 * is in place before it is called.
1630 */
cbbf8932 1631 SV* to_dec = NULL;
e72dc28c 1632 STRLEN len;
2d4fcd5e
AJ
1633#ifdef HAS_SIGPROCMASK
1634 sigset_t set, save;
1635 SV* save_sv;
1636#endif
eb578fdb 1637 const char *s = MgPV_const(mg,len);
7918f24d
NC
1638
1639 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1640
748a9306 1641 if (*s == '_') {
84c7b88c 1642 if (memEQs(s, len, "__DIE__"))
3280af22 1643 svp = &PL_diehook;
84c7b88c 1644 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1645 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1646 /* Merge the existing behaviours, which are as follows:
1647 magic_setsig, we always set svp to &PL_warnhook
1648 (hence we always change the warnings handler)
1649 For magic_clearsig, we don't change the warnings handler if it's
1650 set to the &PL_warnhook. */
3280af22 1651 svp = &PL_warnhook;
84c7b88c
BF
1652 } else if (sv) {
1653 SV *tmp = sv_newmortal();
1654 Perl_croak(aTHX_ "No such hook: %s",
1655 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1656 }
748a9306 1657 i = 0;
38a124f0 1658 if (svp && *svp) {
9289f461
RGS
1659 if (*svp != PERL_WARNHOOK_FATAL)
1660 to_dec = *svp;
cbbf8932 1661 *svp = NULL;
4633a7c4 1662 }
748a9306
LW
1663 }
1664 else {
708854f2
NC
1665 i = (I16)mg->mg_private;
1666 if (!i) {
84c7b88c 1667 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1668 mg->mg_private = (U16)i;
708854f2 1669 }
86d86cad 1670 if (i <= 0) {
84c7b88c
BF
1671 if (sv) {
1672 SV *tmp = sv_newmortal();
1673 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1674 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1675 }
748a9306
LW
1676 return 0;
1677 }
2d4fcd5e
AJ
1678#ifdef HAS_SIGPROCMASK
1679 /* Avoid having the signal arrive at a bad time, if possible. */
1680 sigemptyset(&set);
1681 sigaddset(&set,i);
1682 sigprocmask(SIG_BLOCK, &set, &save);
1683 ENTER;
9ff8e806 1684 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1685 SAVEFREESV(save_sv);
1686 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1687#endif
1688 PERL_ASYNC_CHECK();
2e34cc90 1689#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1690 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1691#endif
23ada85b 1692#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1693 PL_sig_ignoring[i] = 0;
85b332e2 1694#endif
2e34cc90 1695#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1696 PL_sig_defaulting[i] = 0;
2e34cc90 1697#endif
2d4fcd5e 1698 to_dec = PL_psig_ptr[i];
38a124f0
NC
1699 if (sv) {
1700 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1701 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1702
1703 /* Signals don't change name during the program's execution, so once
1704 they're cached in the appropriate slot of PL_psig_name, they can
1705 stay there.
1706
1707 Ideally we'd find some way of making SVs at (C) compile time, or
1708 at least, doing most of the work. */
1709 if (!PL_psig_name[i]) {
1710 PL_psig_name[i] = newSVpvn(s, len);
1711 SvREADONLY_on(PL_psig_name[i]);
1712 }
38a124f0 1713 } else {
79fd3822 1714 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1715 PL_psig_name[i] = NULL;
1716 PL_psig_ptr[i] = NULL;
1717 }
748a9306 1718 }
38a124f0 1719 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1720 if (i) {
5c1546dc 1721 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1722 }
748a9306 1723 else
b37c2d43 1724 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1725 } else {
9dfa190b
NC
1726 if (sv && SvOK(sv)) {
1727 s = SvPV_force(sv, len);
1728 } else {
1729 sv = NULL;
1730 }
84c7b88c 1731 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1732 if (i) {
23ada85b 1733#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1734 PL_sig_ignoring[i] = 1;
1735 (void)rsignal(i, PL_csighandlerp);
85b332e2 1736#else
9dfa190b 1737 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1738#endif
9dfa190b 1739 }
2d4fcd5e 1740 }
84c7b88c 1741 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1742 if (i) {
2e34cc90 1743#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1744 PL_sig_defaulting[i] = 1;
1745 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1746#else
9dfa190b 1747 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1748#endif
9dfa190b
NC
1749 }
1750 }
1751 else {
1752 /*
1753 * We should warn if HINT_STRICT_REFS, but without
1754 * access to a known hint bit in a known OP, we can't
1755 * tell whether HINT_STRICT_REFS is in force or not.
1756 */
0687887e 1757 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1758 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1759 SV_GMAGIC);
1760 if (i)
1761 (void)rsignal(i, PL_csighandlerp);
1762 else
1763 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1764 }
748a9306 1765 }
9dfa190b 1766
2d4fcd5e
AJ
1767#ifdef HAS_SIGPROCMASK
1768 if(i)
1769 LEAVE;
1770#endif
ef8d46e8 1771 SvREFCNT_dec(to_dec);
79072805
LW
1772 return 0;
1773}
64ca3a65 1774#endif /* !PERL_MICRO */
79072805
LW
1775
1776int
864dbfa3 1777Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1778{
7918f24d 1779 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1780 PERL_UNUSED_ARG(sv);
e1a479c5 1781
89c14e2e 1782 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1783 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1784 return 0;
1785
0e446081 1786 return magic_clearisa(NULL, mg);
463ee0b2
LW
1787}
1788
0e446081 1789/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1790int
52b45067
RD
1791Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1792{
52b45067 1793 HV* stash;
7918f24d
NC
1794 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1795
52b45067 1796 /* Bail out if destruction is going on */
627364f1 1797 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1798
0e446081
NC
1799 if (sv)
1800 av_clear(MUTABLE_AV(sv));
52b45067 1801
6624142a
FC
1802 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1803 /* This occurs with setisa_elem magic, which calls this
1804 same function. */
1805 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1806
316ebaf2 1807 assert(mg);
6624142a
FC
1808 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1809 SV **svp = AvARRAY((AV *)mg->mg_obj);
1810 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1811 while (items--) {
1812 stash = GvSTASH((GV *)*svp++);
1813 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1814 }
1815
1816 return 0;
1817 }
1818
52b45067 1819 stash = GvSTASH(
6624142a 1820 (const GV *)mg->mg_obj
52b45067
RD
1821 );
1822
00169e2c
FC
1823 /* The stash may have been detached from the symbol table, so check its
1824 name before doing anything. */
1825 if (stash && HvENAME_get(stash))
5562fa71 1826 mro_isa_changed_in(stash);
52b45067
RD
1827
1828 return 0;
1829}
1830
1831int
864dbfa3 1832Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1833{
85fbaab2 1834 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1835 I32 i = 0;
7918f24d
NC
1836
1837 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1838 PERL_UNUSED_ARG(mg);
7719e241 1839
6ff81951 1840 if (hv) {
497b47a8 1841 (void) hv_iterinit(hv);
ad64d0ec 1842 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1843 i = HvUSEDKEYS(hv);
497b47a8
JH
1844 else {
1845 while (hv_iternext(hv))
1846 i++;
1847 }
6ff81951
GS
1848 }
1849
1850 sv_setiv(sv, (IV)i);
1851 return 0;
1852}
1853
1854int
864dbfa3 1855Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1856{
7918f24d 1857 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1858 PERL_UNUSED_ARG(mg);
946ec16e 1859 if (LvTARG(sv)) {
85fbaab2 1860 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1861 }
1862 return 0;
ac27b0f5 1863}
946ec16e 1864
efaf3674
DM
1865/*
1866=for apidoc magic_methcall
1867
1868Invoke a magic method (like FETCH).
1869
2baee27b
FC
1870C<sv> and C<mg> are the tied thingy and the tie magic.
1871
1872C<meth> is the name of the method to call.
1873
1874C<argc> is the number of args (in addition to $self) to pass to the method.
1875
1876The C<flags> can be:
1877
1878 G_DISCARD invoke method with G_DISCARD flag and don't
1879 return a value
1880 G_UNDEF_FILL fill the stack with argc pointers to
1881 PL_sv_undef
1882
1883The arguments themselves are any values following the C<flags> argument.
efaf3674 1884
796b6530 1885Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1886
1887
1888=cut
1889*/
1890
1891SV*
36925d9e 1892Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1893 U32 argc, ...)
a0d0e21e
LW
1894{
1895 dSP;
efaf3674 1896 SV* ret = NULL;
463ee0b2 1897
7918f24d
NC
1898 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1899
efaf3674 1900 ENTER;
d1d7a15d
NC
1901
1902 if (flags & G_WRITING_TO_STDERR) {
1903 SAVETMPS;
1904
2782061f 1905 save_re_context();
d1d7a15d
NC
1906 SAVESPTR(PL_stderrgv);
1907 PL_stderrgv = NULL;
1908 }
1909
efaf3674 1910 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1911 PUSHMARK(SP);
efaf3674 1912
052a7c76
DM
1913 /* EXTEND() expects a signed argc; don't wrap when casting */
1914 assert(argc <= I32_MAX);
1915 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1916 PUSHs(SvTIED_obj(sv, mg));
1917 if (flags & G_UNDEF_FILL) {
1918 while (argc--) {
efaf3674 1919 PUSHs(&PL_sv_undef);
93965878 1920 }
67549bd2 1921 } else if (argc > 0) {
046b0c7d
NC
1922 va_list args;
1923 va_start(args, argc);
1924
1925 do {
1926 SV *const sv = va_arg(args, SV *);
1927 PUSHs(sv);
1928 } while (--argc);
1929
1930 va_end(args);
88e89b8a 1931 }
463ee0b2 1932 PUTBACK;
efaf3674 1933 if (flags & G_DISCARD) {
36925d9e 1934 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1935 }
1936 else {
36925d9e 1937 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1938 ret = *PL_stack_sp--;
1939 }
1940 POPSTACK;
d1d7a15d
NC
1941 if (flags & G_WRITING_TO_STDERR)
1942 FREETMPS;
efaf3674
DM
1943 LEAVE;
1944 return ret;
1945}
1946
efaf3674 1947/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1948
efaf3674 1949STATIC SV*
36925d9e 1950S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1951 int n, SV *val)
1952{
efaf3674
DM
1953 SV* arg1 = NULL;
1954
1955 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1956
1957 if (mg->mg_ptr) {
1958 if (mg->mg_len >= 0) {
db4b3a1d 1959 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1960 }
1961 else if (mg->mg_len == HEf_SVKEY)
1962 arg1 = MUTABLE_SV(mg->mg_ptr);
1963 }
1964 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1965 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1966 sv_2mortal(arg1);
1967 }
1968 if (!arg1) {
046b0c7d 1969 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1970 }
046b0c7d 1971 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1972}
1973
76e3520e 1974STATIC int
36925d9e 1975S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1976{
efaf3674 1977 SV* ret;
463ee0b2 1978
7918f24d
NC
1979 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1980
efaf3674
DM
1981 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1982 if (ret)
1983 sv_setsv(sv, ret);
a0d0e21e
LW
1984 return 0;
1985}
463ee0b2 1986
a0d0e21e 1987int
864dbfa3 1988Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1989{
7918f24d
NC
1990 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1991
fd69380d 1992 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1993 mg->mg_flags |= MGf_GSKIP;
36925d9e 1994 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1995 return 0;
1996}
1997
1998int
864dbfa3 1999Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 2000{
b112cff9
DM
2001 MAGIC *tmg;
2002 SV *val;
7918f24d
NC
2003
2004 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2005
b112cff9
DM
2006 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2007 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2008 * public flags indicate its value based on copying from $val. Doing
2009 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2010 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2011 * wrong if $val happened to be tainted, as sv hasn't got magic
2012 * enabled, even though taint magic is in the chain. In which case,
2013 * fake up a temporary tainted value (this is easier than temporarily
2014 * re-enabling magic on sv). */
2015
284167a5 2016 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2017 && (tmg->mg_len & 1))
2018 {
2019 val = sv_mortalcopy(sv);
2020 SvTAINTED_on(val);
2021 }
2022 else
2023 val = sv;
2024
36925d9e 2025 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2026 return 0;
2027}
2028
2029int
864dbfa3 2030Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2031{
7918f24d
NC
2032 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2033
4c13be3f 2034 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2035 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2036}
463ee0b2 2037
93965878
NIS
2038
2039U32
864dbfa3 2040Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2041{
22846ab4 2042 I32 retval = 0;
efaf3674 2043 SV* retsv;
93965878 2044
7918f24d
NC
2045 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2046
36925d9e 2047 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2048 if (retsv) {
2049 retval = SvIV(retsv)-1;
22846ab4
AB
2050 if (retval < -1)
2051 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2052 }
22846ab4 2053 return (U32) retval;
93965878
NIS
2054}
2055
cea2e8a9
GS
2056int
2057Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2058{
7918f24d
NC
2059 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2060
36925d9e 2061 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2062 return 0;
2063}
2064
2065int
864dbfa3 2066Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2067{
efaf3674 2068 SV* ret;
463ee0b2 2069
7918f24d
NC
2070 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2071
36925d9e
RZ
2072 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2073 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2074 if (ret)
2075 sv_setsv(key,ret);
79072805
LW
2076 return 0;
2077}
2078
2079int
1146e912 2080Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2081{
7918f24d
NC
2082 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2083
36925d9e 2084 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2085}
a0d0e21e 2086
a3bcc51e
TP
2087SV *
2088Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2089{
5fcbf73d 2090 SV *retval;
ad64d0ec
NC
2091 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2092 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2093
7918f24d
NC
2094 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2095
a3bcc51e
TP
2096 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2097 SV *key;
bfcb3514 2098 if (HvEITER_get(hv))
a3bcc51e
TP
2099 /* we are in an iteration so the hash cannot be empty */
2100 return &PL_sv_yes;
2101 /* no xhv_eiter so now use FIRSTKEY */
2102 key = sv_newmortal();
ad64d0ec 2103 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2104 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2105 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2106 }
2107
2108 /* there is a SCALAR method that we can call */
36925d9e 2109 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2110 if (!retval)
5fcbf73d 2111 retval = &PL_sv_undef;
a3bcc51e
TP
2112 return retval;
2113}
2114
a0d0e21e 2115int
864dbfa3 2116Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2117{
089b5c60 2118 SV **svp;
7918f24d
NC
2119
2120 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2121
089b5c60
NC
2122 /* The magic ptr/len for the debugger's hash should always be an SV. */
2123 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2124 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2125 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2126 }
2127
2128 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2129 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2130 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2131 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2132
8772537c 2133 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2134 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2135 if (o) {
2136#ifdef PERL_DEBUG_READONLY_OPS
2137 Slab_to_rw(OpSLAB(o));
2138#endif
2139 /* set or clear breakpoint in the relevant control op */
089b5c60 2140 if (SvTRUE(sv))
88df5f01 2141 o->op_flags |= OPf_SPECIAL;
8772537c 2142 else
88df5f01
FC
2143 o->op_flags &= ~OPf_SPECIAL;
2144#ifdef PERL_DEBUG_READONLY_OPS
2145 Slab_to_ro(OpSLAB(o));
2146#endif
8772537c 2147 }
5df8de69 2148 }
79072805
LW
2149 return 0;
2150}
2151
2152int
8772537c 2153Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2154{
502c6561 2155 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2156
2157 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2158
83bf042f 2159 if (obj) {
e1dccc0d 2160 sv_setiv(sv, AvFILL(obj));
83bf042f 2161 } else {
3773545d 2162 sv_set_undef(sv);
83bf042f 2163 }
79072805
LW
2164 return 0;
2165}
2166
2167int
864dbfa3 2168Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2169{
502c6561 2170 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2171
2172 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2173
83bf042f 2174 if (obj) {
e1dccc0d 2175 av_fill(obj, SvIV(sv));
83bf042f 2176 } else {
a2a5de95
NC
2177 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2178 "Attempt to set length of freed array");
83bf042f
NC
2179 }
2180 return 0;
2181}
2182
2183int
83f29afa
VP
2184Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2185{
83f29afa
VP
2186 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2187 PERL_UNUSED_ARG(sv);
dc3bf405 2188 PERL_UNUSED_CONTEXT;
83f29afa
VP
2189
2190 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2191 if (sizeof(IV) == sizeof(SSize_t)) {
2192 *((IV *) &(mg->mg_len)) = 0;
2193 } else {
2194 if (mg->mg_ptr)
2195 *((IV *) mg->mg_ptr) = 0;
2196 }
83f29afa
VP
2197
2198 return 0;
2199}
2200
2201int
83bf042f
NC
2202Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2203{
7918f24d 2204 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2205 PERL_UNUSED_ARG(sv);
7918f24d 2206
94f3782b
DM
2207 /* during global destruction, mg_obj may already have been freed */
2208 if (PL_in_clean_all)
1ea47f64 2209 return 0;
94f3782b 2210
83bf042f
NC
2211 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2212
2213 if (mg) {
2214 /* arylen scalar holds a pointer back to the array, but doesn't own a
2215 reference. Hence the we (the array) are about to go away with it
2216 still pointing at us. Clear its pointer, else it would be pointing
2217 at free memory. See the comment in sv_magic about reference loops,
2218 and why it can't own a reference to us. */
2219 mg->mg_obj = 0;
2220 }
a0d0e21e
LW
2221 return 0;
2222}
2223
2224int
864dbfa3 2225Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2226{
16eb5365 2227 SV* const lsv = LvTARG(sv);
96c2a8ff 2228 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2229
2230 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2231 PERL_UNUSED_ARG(mg);
ac27b0f5 2232
6174b39a
FC
2233 if (found && found->mg_len != -1) {
2234 STRLEN i = found->mg_len;
25fdce4a 2235 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2236 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2237 sv_setuv(sv, i);
a0d0e21e 2238 return 0;
a0d0e21e 2239 }
3773545d 2240 sv_set_undef(sv);
a0d0e21e
LW
2241 return 0;
2242}
2243
2244int
864dbfa3 2245Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2246{
16eb5365 2247 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2248 SSize_t pos;
2249 STRLEN len;
53d44271 2250 MAGIC* found;
aec43834 2251 const char *s;
a0d0e21e 2252
7918f24d 2253 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2254 PERL_UNUSED_ARG(mg);
ac27b0f5 2255
96c2a8ff 2256 found = mg_find_mglob(lsv);
3881461a 2257 if (!found) {
a0d0e21e
LW
2258 if (!SvOK(sv))
2259 return 0;
96c2a8ff 2260 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2261 }
2262 else if (!SvOK(sv)) {
3881461a 2263 found->mg_len = -1;
a0d0e21e
LW
2264 return 0;
2265 }
aec43834 2266 s = SvPV_const(lsv, len);
a0d0e21e 2267
e1dccc0d 2268 pos = SvIV(sv);
a0ed51b3 2269
7e2040f0 2270 if (DO_UTF8(lsv)) {
19742f39 2271 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2272 if (ulen)
2273 len = ulen;
a0ed51b3
LW
2274 }
2275
a0d0e21e
LW
2276 if (pos < 0) {
2277 pos += len;
2278 if (pos < 0)
2279 pos = 0;
2280 }
eb160463 2281 else if (pos > (SSize_t)len)
a0d0e21e 2282 pos = len;
a0ed51b3 2283
3881461a 2284 found->mg_len = pos;
25fdce4a 2285 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2286
79072805
LW
2287 return 0;
2288}
2289
2290int
864dbfa3 2291Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2292{
2293 STRLEN len;
35a4481c 2294 SV * const lsv = LvTARG(sv);
b83604b4 2295 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2296 STRLEN offs = LvTARGOFF(sv);
2297 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2298 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2299 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2300
2301 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2302 PERL_UNUSED_ARG(mg);
6ff81951 2303
83f78d1a 2304 if (!translate_substr_offsets(
4ddea69a 2305 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2306 negoff ? -(IV)offs : (IV)offs, !negoff,
2307 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2308 )) {
2309 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2310 sv_set_undef(sv);
83f78d1a
FC
2311 return 0;
2312 }
2313
9aa983d2 2314 if (SvUTF8(lsv))
4ddea69a 2315 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2316 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2317 if (SvUTF8(lsv))
2ef4b674 2318 SvUTF8_on(sv);
6ff81951
GS
2319 return 0;
2320}
2321
2322int
864dbfa3 2323Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2324{
83f78d1a 2325 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2326 const char * const tmps = SvPV_const(sv, len);
dd374669 2327 SV * const lsv = LvTARG(sv);
777f7c56
EB
2328 STRLEN lvoff = LvTARGOFF(sv);
2329 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2330 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2331 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2332
2333 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2334 PERL_UNUSED_ARG(mg);
075a4a2b 2335
a74fb2cd
FC
2336 SvGETMAGIC(lsv);
2337 if (SvROK(lsv))
2338 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2339 "Attempt to use reference as lvalue in substr"
2340 );
fc061ed8
FC
2341 SvPV_force_nomg(lsv,lsv_len);
2342 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2343 if (!translate_substr_offsets(
2344 lsv_len,
2345 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2346 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2347 ))
2348 Perl_croak(aTHX_ "substr outside of string");
2349 oldtarglen = lvlen;
1aa99e6b 2350 if (DO_UTF8(sv)) {
73a087f0 2351 sv_utf8_upgrade_nomg(lsv);
d931b1be 2352 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2353 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2354 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2355 SvUTF8_on(lsv);
2356 }
0d336106 2357 else if (SvUTF8(lsv)) {
5fcbf73d 2358 const char *utf8;
d931b1be 2359 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2360 newtarglen = len;
5fcbf73d 2361 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2362 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2363 Safefree(utf8);
1aa99e6b 2364 }
b76f3ce2 2365 else {
a74fb2cd 2366 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2367 newtarglen = len;
b76f3ce2 2368 }
83f78d1a
FC
2369 if (!neglen) LvTARGLEN(sv) = newtarglen;
2370 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2371
79072805
LW
2372 return 0;
2373}
2374
2375int
864dbfa3 2376Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2377{
7918f24d 2378 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2379 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2380#ifdef NO_TAINT_SUPPORT
2381 PERL_UNUSED_ARG(mg);
2382#endif
7918f24d 2383
64ff300b 2384 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2385 return 0;
2386}
2387
2388int
864dbfa3 2389Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2390{
7918f24d 2391 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2392 PERL_UNUSED_ARG(sv);
7918f24d 2393
b01e650a 2394 /* update taint status */
284167a5 2395 if (TAINT_get)
b01e650a
DM
2396 mg->mg_len |= 1;
2397 else
2398 mg->mg_len &= ~1;
463ee0b2
LW
2399 return 0;
2400}
2401
2402int
864dbfa3 2403Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2404{
35a4481c 2405 SV * const lsv = LvTARG(sv);
1b92e694 2406 char errflags = LvFLAGS(sv);
7918f24d
NC
2407
2408 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2409 PERL_UNUSED_ARG(mg);
6ff81951 2410
1b92e694 2411 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2412 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2413 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2414
6ff81951
GS
2415 return 0;
2416}
2417
2418int
864dbfa3 2419Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2420{
7918f24d 2421 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2422 PERL_UNUSED_ARG(mg);
79072805
LW
2423 do_vecset(sv); /* XXX slurp this routine */
2424 return 0;
2425}
2426
13733cde
FC
2427SV *
2428Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2429{
a0714e2c 2430 SV *targ = NULL;
13733cde
FC
2431 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2432 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2433 assert(mg);
5f05dabc 2434 if (LvTARGLEN(sv)) {
68dc0745 2435 if (mg->mg_obj) {
8772537c 2436 SV * const ahv = LvTARG(sv);
85fbaab2 2437 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2438 if (he)
2439 targ = HeVAL(he);
68dc0745 2440 }
bbfdc870 2441 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2442 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2443 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2444 {
2445 if (SvRMAGICAL(av)) {
2446 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2447 targ = svp ? *svp : NULL;
2448 }
2449 else
bbfdc870 2450 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2451 }
68dc0745 2452 }
46da273f 2453 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2454 /* somebody else defined it for us */
2455 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2456 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2457 LvTARGLEN(sv) = 0;
2458 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2459 mg->mg_obj = NULL;
68dc0745
PP
2460 mg->mg_flags &= ~MGf_REFCOUNTED;
2461 }
13733cde 2462 return targ;
5f05dabc 2463 }
71be2cbc 2464 else
13733cde
FC
2465 return LvTARG(sv);
2466}
2467
2468int
2469Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2470{
2471 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2472
2473 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2474 return 0;
2475}
2476
2477int
864dbfa3 2478Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2479{
7918f24d 2480 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2481 PERL_UNUSED_ARG(mg);
71be2cbc 2482 if (LvTARGLEN(sv))
68dc0745
PP
2483 vivify_defelem(sv);
2484 if (LvTARG(sv)) {
5f05dabc 2485 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2486 SvSETMAGIC(LvTARG(sv));
2487 }
5f05dabc
PP
2488 return 0;
2489}
2490
71be2cbc 2491void
864dbfa3 2492Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2493{
74e13ce4 2494 MAGIC *mg;
a0714e2c 2495 SV *value = NULL;
71be2cbc 2496
7918f24d
NC
2497 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2498
14befaf4 2499 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2500 return;
68dc0745 2501 if (mg->mg_obj) {
8772537c 2502 SV * const ahv = LvTARG(sv);
85fbaab2 2503 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2504 if (he)
2505 value = HeVAL(he);
3280af22 2506 if (!value || value == &PL_sv_undef)
be2597df 2507 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2508 }
bbfdc870
FC
2509 else if (LvSTARGOFF(sv) < 0)
2510 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2511 else {
502c6561 2512 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2513 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2514 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2515 else {
bbfdc870 2516 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2517 if (!svp || !(value = *svp))
bbfdc870 2518 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2519 }
2520 }
b37c2d43 2521 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2522 SvREFCNT_dec(LvTARG(sv));
2523 LvTARG(sv) = value;
71be2cbc 2524 LvTARGLEN(sv) = 0;
68dc0745 2525 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2526 mg->mg_obj = NULL;
68dc0745 2527 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2528}
2529
2530int
1f1dcfb5
FC
2531Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2532{
2533 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2534 PERL_UNUSED_ARG(mg);
2535 sv_unmagic(sv, PERL_MAGIC_nonelem);
2536 return 0;
2537}
2538
2539int
864dbfa3 2540Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2541{
7918f24d 2542 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2543 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2544 return 0;
810b8aa5
GS
2545}
2546
2547int
864dbfa3 2548Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2549{
7918f24d 2550 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2551 PERL_UNUSED_CONTEXT;
0177730e 2552 PERL_UNUSED_ARG(sv);
565764a8 2553 mg->mg_len = -1;
93a17b20
LW
2554 return 0;
2555}
2556
2557int
864dbfa3 2558Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2559{
35a4481c 2560 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2561
7918f24d
NC
2562 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2563
79072805 2564 if (uf && uf->uf_set)
24f81a43 2565 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2566 return 0;
2567}
2568
c277df42 2569int
faf82a0b
AE
2570Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2571{
488344d2 2572 const char type = mg->mg_type;
7918f24d
NC
2573
2574 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2575
a5c7cb08
DM
2576 assert( type == PERL_MAGIC_fm
2577 || type == PERL_MAGIC_qr
2578 || type == PERL_MAGIC_bm);
488344d2 2579 return sv_unmagic(sv, type);
faf82a0b
AE
2580}
2581
7a4c00b4 2582#ifdef USE_LOCALE_COLLATE
79072805 2583int
864dbfa3 2584Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2585{
7918f24d
NC
2586 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2587
bbce6d69 2588 /*
838b5b74 2589 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2590 * and vanished with a faint plop.
2591 */
96a5add6 2592 PERL_UNUSED_CONTEXT;
8772537c 2593 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2594 if (mg->mg_ptr) {
2595 Safefree(mg->mg_ptr);
2596 mg->mg_ptr = NULL;
565764a8 2597 mg->mg_len = -1;
7a4c00b4 2598 }
bbce6d69
PP
2599 return 0;
2600}
7a4c00b4 2601#endif /* USE_LOCALE_COLLATE */
bbce6d69 2602
7e8c5dac
HS
2603/* Just clear the UTF-8 cache data. */
2604int
2605Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2606{
7918f24d 2607 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2608 PERL_UNUSED_CONTEXT;
8772537c 2609 PERL_UNUSED_ARG(sv);
7e8c5dac 2610 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2611 mg->mg_ptr = NULL;
7e8c5dac
HS
2612 mg->mg_len = -1; /* The mg_len holds the len cache. */
2613 return 0;
2614}
2615
bbce6d69 2616int
9cce4f9a
FC
2617Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2618{
9782ce69 2619 const char *bad = NULL;
9cce4f9a 2620 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2621 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2622 switch (mg->mg_private & OPpLVREF_TYPE) {
2623 case OPpLVREF_SV:
2624 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2625 bad = " SCALAR";
2626 break;
2627 case OPpLVREF_AV:
2628 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2629 bad = "n ARRAY";
2630 break;
2631 case OPpLVREF_HV:
2632 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2633 bad = " HASH";
2634 break;
2635 case OPpLVREF_CV:
2636 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2637 bad = " CODE";
2638 }
2639 if (bad)
26a50d99 2640 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2641 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2642 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2643 case 0:
2644 {
2645 SV * const old = PAD_SV(mg->mg_len);
2646 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2647 SvREFCNT_dec(old);
2648 break;
2649 }
2650 case SVt_PVGV:
2651 gv_setref(mg->mg_obj, sv);
2652 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2653 break;
2654 case SVt_PVAV:
2655 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2656 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2657 break;
2658 case SVt_PVHV:
7fcb36d5
JH
2659 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2660 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2661 }
d39c26a6
FC
2662 if (mg->mg_flags & MGf_PERSIST)
2663 NOOP; /* This sv is in use as an iterator var and will be reused,
2664 so we must leave the magic. */
2665 else
2666 /* This sv could be returned by the assignment op, so clear the
2667 magic, as lvrefs are an implementation detail that must not be
2668 leaked to the user. */
2669 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2670 return 0;
2671}
2672
f1540bed
JH
2673static void
2674S_set_dollarzero(pTHX_ SV *sv)
2675 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2676{
2677#ifdef USE_ITHREADS
2678 dVAR;
2679#endif
2680 const char *s;
2681 STRLEN len;
f1540bed
JH
2682#ifdef HAS_SETPROCTITLE
2683 /* The BSDs don't show the argv[] in ps(1) output, they
2684 * show a string from the process struct and provide
2685 * the setproctitle() routine to manipulate that. */
2686 if (PL_origalen != 1) {
2687 s = SvPV_const(sv, len);
38626956 2688# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2689 /* The leading "-" removes the "perl: " prefix,
2690 * but not the "(perl) suffix from the ps(1)
2691 * output, because that's what ps(1) shows if the
2692 * argv[] is modified. */
2693 setproctitle("-%s", s);
2694# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2695 /* This doesn't really work if you assume that
2696 * $0 = 'foobar'; will wipe out 'perl' from the $0
2697 * because in ps(1) output the result will be like
2698 * sprintf("perl: %s (perl)", s)
2699 * I guess this is a security feature:
2700 * one (a user process) cannot get rid of the original name.
2701 * --jhi */
2702 setproctitle("%s", s);
2703# endif
2704 }
2705#elif defined(__hpux) && defined(PSTAT_SETCMD)
2706 if (PL_origalen != 1) {
2707 union pstun un;
2708 s = SvPV_const(sv, len);
2709 un.pst_command = (char *)s;
2710 pstat(PSTAT_SETCMD, un, len, 0, 0);
2711 }
2712#else
2713 if (PL_origalen > 1) {
4f3e04fd 2714 I32 i;
f1540bed
JH
2715 /* PL_origalen is set in perl_parse(). */
2716 s = SvPV_force(sv,len);
2717 if (len >= (STRLEN)PL_origalen-1) {
2718 /* Longer than original, will be truncated. We assume that
2719 * PL_origalen bytes are available. */
2720 Copy(s, PL_origargv[0], PL_origalen-1, char);
2721 }
2722 else {
2723 /* Shorter than original, will be padded. */
2724#ifdef PERL_DARWIN
2725 /* Special case for Mac OS X: see [perl #38868] */
2726 const int pad = 0;
2727#else
2728 /* Is the space counterintuitive? Yes.
2729 * (You were expecting \0?)
2730 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2731 * --jhi */
2732 const int pad = ' ';
2733#endif
2734 Copy(s, PL_origargv[0], len, char);
2735 PL_origargv[0][len] = 0;
2736 memset(PL_origargv[0] + len + 1,
2737 pad, PL_origalen - len - 1);
2738 }
2739 PL_origargv[0][PL_origalen-1] = 0;
2740 for (i = 1; i < PL_origargc; i++)
2741 PL_origargv[i] = 0;
2742#ifdef HAS_PRCTL_SET_NAME
2743 /* Set the legacy process name in addition to the POSIX name on Linux */
2744 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2745 /* diag_listed_as: SKIPME */
2746 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2747 }
2748#endif
2749 }
2750#endif
2751}
2752
9cce4f9a 2753int
864dbfa3 2754Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2755{
20b7effb 2756#ifdef USE_ITHREADS
97aff369 2757 dVAR;
20b7effb 2758#endif
eb578fdb
KW
2759 I32 paren;
2760 const REGEXP * rx;
79072805 2761 I32 i;
8990e307 2762 STRLEN len;
125b9982 2763 MAGIC *tmg;
2fdbfb4d 2764
7918f24d
NC
2765 PERL_ARGS_ASSERT_MAGIC_SET;
2766
e91d8259 2767 if (!mg->mg_ptr) {
960b831f 2768 paren = mg->mg_len;
1e05feb3 2769 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2770 setparen_got_rx:
2fdbfb4d 2771 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2772 } else {
2fdbfb4d
AB
2773 /* Croak with a READONLY error when a numbered match var is
2774 * set without a previous pattern match. Unless it's C<local $1>
2775 */
e91d8259 2776 croakparen:
2fdbfb4d 2777 if (!PL_localizing) {
cb077ed2 2778 Perl_croak_no_modify();
2fdbfb4d
AB
2779 }
2780 }
e91d8259
NC
2781 return 0;
2782 }
2783
2784 switch (*mg->mg_ptr) {
748a9306 2785 case '\001': /* ^A */
f2da823f
FC
2786 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2787 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2788 FmLINES(PL_bodytarget) = 0;
2789 if (SvPOK(PL_bodytarget)) {
2790 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2791 char *e = SvEND(PL_bodytarget);
2792 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2793 FmLINES(PL_bodytarget)++;
2794 s++;
2795 }
2796 }
125b9982 2797 /* mg_set() has temporarily made sv non-magical */
284167a5 2798 if (TAINTING_get) {
125b9982
NT
2799 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2800 SvTAINTED_on(PL_bodytarget);
2801 else
2802 SvTAINTED_off(PL_bodytarget);
2803 }
748a9306 2804 break;
49460fe6 2805 case '\003': /* ^C */
f2338a2e 2806 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2807 break;
2808
79072805 2809 case '\004': /* ^D */
b4ab917c 2810#ifdef DEBUGGING
a9e2d2bf
DM
2811 {
2812 const char *s = SvPV_nolen_const(sv);
2813 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2814 if (DEBUG_x_TEST || DEBUG_B_TEST)
2815 dump_all_perl(!DEBUG_B_TEST);
2816 }
b4ab917c 2817#else
38ab35f8 2818 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2819#endif
79072805 2820 break;
28f23441 2821 case '\005': /* ^E */
d0063567 2822 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2823#ifdef VMS
38ab35f8 2824 set_vaxc_errno(SvIV(sv));
2abc681d 2825#elif defined(WIN32)
d0063567 2826 SetLastError( SvIV(sv) );
2abc681d 2827#elif defined(OS2)
38ab35f8 2828 os2_setsyserrno(SvIV(sv));
2abc681d 2829#else
d0063567 2830 /* will anyone ever use this? */
38ab35f8 2831 SETERRNO(SvIV(sv), 4);
22fae026 2832#endif
d0063567 2833 }
fd503f5c
DIM
2834 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2835 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2836 break;
79072805 2837 case '\006': /* ^F */
38ab35f8 2838 PL_maxsysfd = SvIV(sv);
79072805 2839 break;
a0d0e21e 2840 case '\010': /* ^H */
efa571ab
KW
2841 {
2842 U32 save_hints = PL_hints;
5d382c25 2843 PL_hints = SvUV(sv);
efa571ab
KW
2844
2845 /* If wasn't UTF-8, and now is, notify the parser */
2846 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2847 notify_parser_that_changed_to_utf8();
2848 }
2849 }
a0d0e21e 2850 break;
9d116dd7 2851 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2852 Safefree(PL_inplace);
bd61b366 2853 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2854 break;
d9bad346
FC
2855 case '\016': /* ^N */
2856 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2857 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2858 goto croakparen;
28f23441 2859 case '\017': /* ^O */
ac27b0f5 2860 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2861 Safefree(PL_osname);
bd61b366 2862 PL_osname = NULL;
3511154c
DM
2863 if (SvOK(sv)) {
2864 TAINT_PROPER("assigning to $^O");
2e0de35c 2865 PL_osname = savesvpv(sv);
3511154c 2866 }
ac27b0f5
NIS
2867 }
2868 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2869 STRLEN len;
2870 const char *const start = SvPV(sv, len);
b54fc2b6 2871 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2872 SV *tmp;
8b850bd5
NC
2873
2874
2875 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2876 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2877
2878 /* Opening for input is more common than opening for output, so
2879 ensure that hints for input are sooner on linked list. */
59cd0e26 2880 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2881 SvUTF8(sv))
2882 : newSVpvs_flags("", SvUTF8(sv));
2883 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2884 mg_set(tmp);
8b850bd5 2885
f747ebd6
Z
2886 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2887 SvUTF8(sv));
2888 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2889 mg_set(tmp);
ac27b0f5 2890 }
28f23441 2891 break;
79072805 2892 case '\020': /* ^P */
2fdbfb4d
AB
2893 PL_perldb = SvIV(sv);
2894 if (PL_perldb && !PL_DBsingle)
2895 init_debugger();
9b9e0be4 2896 break;
79072805 2897 case '\024': /* ^T */
88e89b8a 2898#ifdef BIG_TIME
6b88bc9c 2899 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2900#else
38ab35f8 2901 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2902#endif
79072805 2903 break;
e07ea26a
NC
2904 case '\025': /* ^UTF8CACHE */
2905 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2906 PL_utf8cache = (signed char) sv_2iv(sv);
2907 }
2908 break;
fde18df1 2909 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2910 if (*(mg->mg_ptr+1) == '\0') {
2911 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2912 i = SvIV(sv);
ac27b0f5 2913 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2914 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2915 }
599cee73 2916 }
0a378802 2917 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2918 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2919 if (!SvPOK(sv)) {
2920 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2921 break;
2922 }
f4fc7782 2923 {
b5477537 2924 STRLEN len, i;
006c1a1d
Z
2925 int not_none = 0, not_all = 0;
2926 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
f4fc7782 2927 for (i = 0 ; i < len ; ++i) {
006c1a1d
Z
2928 not_none |= ptr[i];
2929 not_all |= ptr[i] ^ 0x55;
f4fc7782 2930 }
006c1a1d 2931 if (!not_none) {
4243c432
NC
2932 if (!specialWARN(PL_compiling.cop_warnings))
2933 PerlMemShared_free(PL_compiling.cop_warnings);
2934 PL_compiling.cop_warnings = pWARN_NONE;
006c1a1d
Z
2935 } else if (len >= WARNsize && !not_all) {
2936 if (!specialWARN(PL_compiling.cop_warnings))
3c3f8cd6
AB
2937 PerlMemShared_free(PL_compiling.cop_warnings);
2938 PL_compiling.cop_warnings = pWARN_ALL;
2939 PL_dowarn |= G_WARN_ONCE ;
2940 }
d3a7d8c7 2941 else {
72dc9ed5
NC
2942 STRLEN len;
2943 const char *const p = SvPV_const(sv, len);
2944
2945 PL_compiling.cop_warnings
8ee4cf24 2946 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2947 p, len);
2948
d3a7d8c7
GS
2949 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2950 PL_dowarn |= G_WARN_ONCE ;
2951 }
f4fc7782 2952
d3a7d8c7 2953 }
4438c4b7 2954 }
971a9dd3 2955 }
8ca2a5d6
DD
2956#ifdef WIN32
2957 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2958 w32_sloppystat = (bool)sv_true(sv);
2959 }
2960#endif
79072805
LW
2961 break;
2962 case '.':
3280af22
NIS
2963 if (PL_localizing) {
2964 if (PL_localizing == 1)
7766f137 2965 SAVESPTR(PL_last_in_gv);
748a9306 2966 }
3280af22 2967 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2968 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2969 break;
2970 case '^':
acbe1b9d 2971 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2972 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2973 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2974 break;
2975 case '~':
acbe1b9d 2976 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2977 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2978 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2979 break;
2980 case '=':
acbe1b9d 2981 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2982 break;
2983 case '-':
acbe1b9d
FC
2984 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2985 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2986 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2987 break;
2988 case '%':
acbe1b9d 2989 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2990 break;
2991 case '|':
4b65379b 2992 {
099be4f1 2993 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2994 if(!io)
2995 break;
38ab35f8 2996 if ((SvIV(sv)) == 0)
4b65379b
CS
2997 IoFLAGS(io) &= ~IOf_FLUSH;
2998 else {
2999 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3000 PerlIO *ofp = IoOFP(io);
3001 if (ofp)
3002 (void)PerlIO_flush(ofp);
3003 IoFLAGS(io) |= IOf_FLUSH;
3004 }
3005 }
79072805
LW
3006 }
3007 break;
79072805 3008 case '/':
1ab48e3a 3009 {
1ab48e3a 3010 if (SvROK(sv)) {
8d37cdf7
DIM
3011 SV *referent = SvRV(sv);
3012 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3013 /* XXX: dodgy type check: This leaves me feeling dirty, but
3014 * the alternative is to copy pretty much the entire
3015 * sv_reftype() into this routine, or to do a full string
3016 * comparison on the return of sv_reftype() both of which
3017 * make me feel worse! NOTE, do not modify this comment
3018 * without reviewing the corresponding comment in
3019 * sv_reftype(). - Yves */
1ab48e3a 3020 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3021 IV val = SvIV(referent);
1ab48e3a 3022 if (val <= 0) {
520b6fb6
DIM
3023 sv_setsv(sv, PL_rs);
3024 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3025 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3026 }
3027 } else {
ddce084a 3028 sv_setsv(sv, PL_rs);
8d37cdf7 3029 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3030 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3031 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3032 }
3033 }
b3a2acfa 3034 SvREFCNT_dec(PL_rs);
520b6fb6 3035 PL_rs = newSVsv(sv);
b3a2acfa 3036 }
79072805
LW
3037 break;
3038 case '\\':
ef8d46e8 3039 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3040 if (SvOK(sv)) {
7889fe52 3041 PL_ors_sv = newSVsv(sv);
009c130f 3042 }
e3c19b7b 3043 else {
a0714e2c 3044 PL_ors_sv = NULL;
e3c19b7b 3045 }
79072805 3046 break;
7d69d4a6
FC
3047 case '[':
3048 if (SvIV(sv) != 0)
3049 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3050 break;
79072805 3051 case '?':
ff0cee69 3052#ifdef COMPLEX_STATUS
6b88bc9c 3053 if (PL_localizing == 2) {
41cb7b2b 3054 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3055 PL_statusvalue = LvTARGOFF(sv);
3056 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3057 }
3058 else
3059#endif
3060#ifdef VMSISH_STATUS
3061 if (VMSISH_STATUS)
fb38d079 3062 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3063 else
3064#endif
38ab35f8 3065 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3066 break;
3067 case '!':
93189314
JH
3068 {
3069#ifdef VMS
3070# define PERL_VMS_BANG vaxc$errno
3071#else
3072# define PERL_VMS_BANG 0
3073#endif
27329181 3074#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
3075 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3076 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3077#else
91487cfc 3078 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3079 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3080#endif
93189314 3081 }
79072805
LW
3082 break;
3083 case '<':
985213f2 3084 {
b469f1e0 3085 /* XXX $< currently silently ignores failures */
dfff4baf 3086 const Uid_t new_uid = SvUID(sv);
985213f2 3087 PL_delaymagic_uid = new_uid;
3280af22
NIS
3088 if (PL_delaymagic) {
3089 PL_delaymagic |= DM_RUID;
79072805
LW
3090 break; /* don't do magic till later */
3091 }
3092#ifdef HAS_SETRUID
b469f1e0 3093 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3094#elif defined(HAS_SETREUID)
b469f1e0 3095 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3096#elif defined(HAS_SETRESUID)
b469f1e0 3097 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3098#else
985213f2 3099 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3100# ifdef PERL_DARWIN
75870ed3 3101 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3102 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3103 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3104# endif
b469f1e0 3105 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3106 } else {
cea2e8a9 3107 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3108 }
79072805 3109#endif
79072805 3110 break;
985213f2 3111 }
79072805 3112 case '>':
985213f2 3113 {
b469f1e0 3114 /* XXX $> currently silently ignores failures */
dfff4baf 3115 const Uid_t new_euid = SvUID(sv);
985213f2 3116 PL_delaymagic_euid = new_euid;
3280af22
NIS
3117 if (PL_delaymagic) {
3118 PL_delaymagic |= DM_EUID;
79072805
LW
3119 break; /* don't do magic till later */
3120 }
3121#ifdef HAS_SETEUID
b469f1e0 3122 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3123#elif defined(HAS_SETREUID)
b469f1e0 3124 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3125#elif defined(HAS_SETRESUID)
b469f1e0 3126 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3127#else
985213f2 3128 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3129 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3130 else {
cea2e8a9 3131 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3132 }
79072805 3133#endif
79072805 3134 break;
985213f2 3135 }
79072805 3136 case '(':
985213f2 3137 {
b469f1e0 3138 /* XXX $( currently silently ignores failures */
dfff4baf 3139 const Gid_t new_gid = SvGID(sv);
985213f2 3140 PL_delaymagic_gid = new_gid;
3280af22
NIS
3141 if (PL_delaymagic) {
3142 PL_delaymagic |= DM_RGID;
79072805
LW
3143 break; /* don't do magic till later */
3144 }
3145#ifdef HAS_SETRGID
b469f1e0 3146 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3147#elif defined(HAS_SETREGID)
b469f1e0 3148 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3149#elif defined(HAS_SETRESGID)
b469f1e0 3150 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3151#else
985213f2 3152 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3153 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3154 else {
cea2e8a9 3155 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3156 }
79072805 3157#endif
79072805 3158 break;
985213f2 3159 }
79072805 3160 case ')':
985213f2 3161 {
0635704a
HS
3162/* (hv) best guess: maybe we'll need configure probes to do a better job,
3163 * but you can override it if you need to.
3164 */
3165#ifndef INVALID_GID
3166#define INVALID_GID ((Gid_t)-1)
3167#endif
b469f1e0 3168 /* XXX $) currently silently ignores failures */
dfff4baf 3169 Gid_t new_egid;
5cd24f17
PP
3170#ifdef HAS_SETGROUPS
3171 {
b83604b4 3172 const char *p = SvPV_const(sv, len);
757f63d8 3173 Groups_t *gary = NULL;
fdadaf77 3174 const char* endptr;
22ff3130 3175 UV uv;
fb4089e0 3176#ifdef _SC_NGROUPS_MAX
3177 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3178
3179 if (maxgrp < 0)
3180 maxgrp = NGROUPS;
3181#else
3182 int maxgrp = NGROUPS;
3183#endif
757f63d8
SP
3184
3185 while (isSPACE(*p))
3186 ++p;
22ff3130
HS
3187 if (grok_atoUV(p, &uv, &endptr))
3188 new_egid = (Gid_t)uv;
3189 else {
0635704a 3190 new_egid = INVALID_GID;
22ff3130
HS
3191 endptr = NULL;
3192 }
fb4089e0 3193 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3194 if (endptr == NULL)
3195 break;
3196 p = endptr;
757f63d8
SP
3197 while (isSPACE(*p))
3198 ++p;
3199 if (!*p)
3200 break;
fdadaf77 3201 if (!gary)
757f63d8
SP
3202 Newx(gary, i + 1, Groups_t);
3203 else
3204 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3205 if (grok_atoUV(p, &uv, &endptr))
3206 gary[i] = (Groups_t)uv;
3207 else {
0635704a 3208 gary[i] = INVALID_GID;
22ff3130
HS
3209 endptr = NULL;
3210 }
757f63d8
SP
3211 }
3212 if (i)
b469f1e0 3213 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3214 Safefree(gary);
5cd24f17
PP
3215 }
3216#else /* HAS_SETGROUPS */
dfff4baf 3217 new_egid = SvGID(sv);
5cd24f17 3218#endif /* HAS_SETGROUPS */
985213f2 3219 PL_delaymagic_egid = new_egid;
3280af22
NIS
3220 if (PL_delaymagic) {
3221 PL_delaymagic |= DM_EGID;
79072805
LW
3222 break; /* don't do magic till later */
3223 }
3224#ifdef HAS_SETEGID
b469f1e0 3225 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3226#elif defined(HAS_SETREGID)
b469f1e0 3227 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3228#elif defined(HAS_SETRESGID)
b469f1e0 3229 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3230#else
985213f2 3231 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3232 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3233 else {
cea2e8a9 3234 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3235 }
79072805 3236#endif
79072805 3237 break;
985213f2 3238 }
79072805 3239 case ':':
2d8e6c8d 3240 PL_chopset = SvPV_force(sv,len);
79072805 3241 break;
9cdac2a2
FC
3242 case '$': /* $$ */
3243 /* Store the pid in mg->mg_obj so we can tell when a fork has
3244 occurred. mg->mg_obj points to *$ by default, so clear it. */
3245 if (isGV(mg->mg_obj)) {
3246 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3247 SvREFCNT_dec(mg->mg_obj);
3248 mg->mg_flags |= MGf_REFCOUNTED;
3249 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3250 }
3251 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3252 break;
79072805 3253 case '0':
e2975953 3254 LOCK_DOLLARZERO_MUTEX;
f1540bed 3255 S_set_dollarzero(aTHX_ sv);
e2975953 3256 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3257 break;
3258 }
3259 return 0;
3260}
3261
3262I32
84c7b88c
BF
3263Perl_whichsig_sv(pTHX_ SV *sigsv)
3264{
3265 const char *sigpv;
3266 STRLEN siglen;
3267 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3268 sigpv = SvPV_const(sigsv, siglen);
3269 return whichsig_pvn(sigpv, siglen);
3270}
3271
3272I32
3273Perl_whichsig_pv(pTHX_ const char *sig)
3274{
3275 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3276 return whichsig_pvn(sig, strlen(sig));
3277}
3278
3279I32
3280Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3281{
eb578fdb 3282 char* const* sigv;
7918f24d 3283
84c7b88c 3284 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3285 PERL_UNUSED_CONTEXT;
79072805 3286
aadb217d 3287 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3288 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3289 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3290#ifdef SIGCLD
84c7b88c 3291 if (memEQs(sig, len, "CHLD"))
79072805
LW
3292 return SIGCLD;
3293#endif
3294#ifdef SIGCHLD
84c7b88c 3295 if (memEQs(sig, len, "CLD"))
79072805
LW
3296 return SIGCHLD;
3297#endif
7f1236c0 3298 return -1;
79072805
LW
3299}
3300
ecfc5424 3301Signal_t
1e82f5a6 3302#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3303Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3304#else
3305Perl_sighandler(int sig)
3306#endif
79072805 3307{
1018e26f
NIS
3308#ifdef PERL_GET_SIG_CONTEXT
3309 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3310#else
cea2e8a9 3311 dTHX;
71d280e3 3312#endif
79072805 3313 dSP;
a0714e2c
SS
3314 GV *gv = NULL;
3315 SV *sv = NULL;
8772537c 3316 SV * const tSv = PL_Sv;
601f1833 3317 CV *cv = NULL;
533c011a 3318 OP *myop = PL_op;
84902520 3319 U32 flags = 0;
8772537c 3320 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3321 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3322 SV *errsv_save = NULL;
71d280e3 3323
84902520 3324
727405f8 3325 if (!PL_psig_ptr[sig]) {
99ef548b 3326 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3327 PL_sig_name[sig]);
3328 exit(sig);
3329 }
ff0cee69 3330
a0d63a7b
DM
3331 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3332 /* Max number of items pushed there is 3*n or 4. We cannot fix
3333 infinity, so we fix 4 (in fact 5): */
3334 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3335 flags |= 1;
3336 PL_savestack_ix += 5; /* Protect save in progress. */
3337 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3338 }
84902520 3339 }
84902520 3340 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3341 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3342 || SvTYPE(cv) != SVt_PVCV) {
3343 HV *st;
f2c0649b 3344 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3345 }
84902520 3346
a0d0e21e 3347 if (!cv || !CvROOT(cv)) {
07c325bb 3348 const HEK * const hek = gv
1d6bb9ae
FC
3349 ? GvENAME_HEK(gv)
3350 : cv && CvNAMED(cv)
3351 ? CvNAME_HEK(cv)
07c325bb
FC
3352 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3353 if (hek)
3354 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3355 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3356 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3357 /* diag_listed_as: SIG%s handler "%s" not defined */
3358 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3359 "SIG%s handler \"__ANON__\" not defined.\n",
3360 PL_sig_name[sig]);
00d579c5 3361 goto cleanup;
79072805
LW
3362 }
3363
0c4d3b5e
DM
3364 sv = PL_psig_name[sig]
3365 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3366 : newSVpv(PL_sig_name[sig],0);
72048cfe 3367 flags |= 8;
0c4d3b5e
DM
3368 SAVEFREESV(sv);
3369
a0d63a7b
DM
3370 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3371 /* make sure our assumption about the size of the SAVEs are correct:
3372 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3373 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3374 }
e336de0d 3375
e788e7d3 3376 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3377 PUSHMARK(SP);
79072805 3378 PUSHs(sv);
8aad04aa
JH
3379#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3380 {
3381 struct sigaction oact;
3382
3383 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3384 if (sip) {
3385 HV *sih = newHV();
ad64d0ec 3386 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3387 /* The siginfo fields signo, code, errno, pid, uid,
3388 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3389 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3390 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3391#ifdef HAS_SIGINFO_SI_ERRNO
3392 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3393#endif
3394#ifdef HAS_SIGINFO_SI_STATUS
3395 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3396#endif
3397#ifdef HAS_SIGINFO_SI_UID
3398 {
3399 SV *uid = newSV(0);
3400 sv_setuid(uid, sip->si_uid);
3401 (void)hv_stores(sih, "uid", uid);
3402 }
3403#endif
3404#ifdef HAS_SIGINFO_SI_PID
3405 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3406#endif
3407#ifdef HAS_SIGINFO_SI_ADDR
3408 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3409#endif
3410#ifdef HAS_SIGINFO_SI_BAND
3411 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3412#endif
8aad04aa 3413 EXTEND(SP, 2);
ad64d0ec 3414 PUSHs(rv);
22f1178f 3415 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3416 }
b4552a27 3417
8aad04aa
JH
3418 }
3419 }
3420#endif
79072805 3421 PUTBACK;
a0d0e21e 3422
100c03aa
JL
3423 errsv_save = newSVsv(ERRSV);
3424
ad64d0ec 3425 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3426
d3acc0f7 3427 POPSTACK;
eed484f9
DD
3428 {
3429 SV * const errsv = ERRSV;
3430 if (SvTRUE_NN(errsv)) {
3431 SvREFCNT_dec(errsv_save);
c22d665b 3432#ifndef PERL_MICRO
1b266415
NIS
3433 /* Handler "died", for example to get out of a restart-able read().
3434 * Before we re-do that on its behalf re-enable the signal which was
3435 * blocked by the system when we entered.
3436 */
c22d665b 3437#ifdef HAS_SIGPROCMASK
d488af49 3438#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3439 if (sip || uap)
c22d665b 3440#endif
eed484f9
DD
3441 {
3442 sigset_t set;
3443 sigemptyset(&set);
3444 sigaddset(&set,sig);
3445 sigprocmask(SIG_UNBLOCK, &set, NULL);
3446 }
c22d665b 3447#else
eed484f9
DD
3448 /* Not clear if this will work */
3449 (void)rsignal(sig, SIG_IGN);
3450 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3451#endif
3452#endif /* !PERL_MICRO */
eed484f9
DD
3453 die_sv(errsv);
3454 }
3455 else {
3456 sv_setsv(errsv, errsv_save);
3457 SvREFCNT_dec(errsv_save);
3458 }
100c03aa
JL
3459 }
3460
7b52d656 3461 cleanup:
0c4d3b5e
DM
3462 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3463 PL_savestack_ix = old_ss_ix;
72048cfe 3464 if (flags & 8)
2357bae7 3465 SvREFCNT_dec_NN(sv);
533c011a 3466 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3467
3280af22
NIS
3468 PL_Sv = tSv; /* Restore global temporaries. */
3469 PL_Xpv = tXpv;
53bb94e2