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
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.
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.
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
19 =head1 Magical Functions
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,
22 an SV marked as magical, it calls the 'get' or 'set' function associated
23 with that SV's magic. A get is called prior to reading an SV, in order to
24 give it a chance to update its internal value (get on $. writes the line
25 number of the last read filehandle into the SV's IV slot), while
26 set is called after an SV has been written to, in order to allow it to make
27 use of its changed value (set on $/ copies the SV's new value to the
28 PL_rs global variable).
30 Magic is implemented as a linked list of MAGIC structures attached to the
31 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
32 of functions that implement the get(), set(), length() etc functions,
33 plus space for some flags and pointers. For example, a tied variable has
34 a MAGIC structure that contains a pointer to the object associated with the
45 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
51 #if defined(HAS_SETGROUPS)
58 # include <sys/pstat.h>
61 #ifdef HAS_PRCTL_SET_NAME
62 # include <sys/prctl.h>
65 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
66 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
68 Signal_t Perl_csighandler(int sig);
72 /* Missing protos on LynxOS */
73 void setruid(uid_t id);
74 void seteuid(uid_t id);
75 void setrgid(uid_t id);
76 void setegid(uid_t id);
80 * Pre-magic setup and post-magic takedown.
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
90 /* MGS is typedef'ed to struct magic_state in perl.h */
93 S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
100 assert(SvMAGICAL(sv));
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);
113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
115 mgs = SSPTR(mgs_ix, MGS*);
117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
119 mgs->mgs_bumped = bumped;
121 SvFLAGS(sv) &= ~flags;
125 #define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
128 =for apidoc mg_magical
130 Turns on the magical status of an SV. See C<L</sv_magic>>.
136 Perl_mg_magical(SV *sv)
139 PERL_ARGS_ASSERT_MG_MAGICAL;
142 if ((mg = SvMAGIC(sv))) {
144 const MGVTBL* const vtbl = mg->mg_virtual;
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
162 Do magic before a value is retrieved from the SV. The type of SV must
163 be >= C<SVt_PVMG>. See C<L</sv_magic>>.
169 Perl_mg_get(pTHX_ SV *sv)
171 const I32 mgs_ix = SSNEW(sizeof(MGS));
174 bool taint_only = TRUE; /* the only get method seen is taint */
175 MAGIC *newmg, *head, *cur, *mg;
177 PERL_ARGS_ASSERT_MG_GET;
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
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 */
185 newmg = cur = head = mg = SvMAGIC(sv);
187 const MGVTBL * const vtbl = mg->mg_virtual;
188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
192 /* taint's mg get is so dumb it doesn't need flag saving */
193 if (mg->mg_type != PERL_MAGIC_taint) {
196 save_magic(mgs_ix, sv);
201 vtbl->svt_get(aTHX_ sv, mg);
203 /* guard against magic having been deleted - eg FETCH calling
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
211 /* recalculate flags if this entry was deleted. */
212 if (mg->mg_flags & MGf_GSKIP)
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
216 else if (vtbl == &PL_vtbl_utf8) {
217 /* get-magic can reallocate the PV, unless there's only taint
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
225 && mg2->mg_virtual->svt_get
233 magic_setutf8(sv, mg);
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
248 /* Were any new entries added? */
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
267 Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
273 Perl_mg_set(pTHX_ SV *sv)
275 const I32 mgs_ix = SSNEW(sizeof(MGS));
279 PERL_ARGS_ASSERT_MG_SET;
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
286 const MGVTBL* vtbl = mg->mg_virtual;
287 nextmg = mg->mg_moremagic; /* it may delete itself */
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
292 if (PL_localizing == 2
293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
295 if (vtbl && vtbl->svt_set)
296 vtbl->svt_set(aTHX_ sv, mg);
299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
304 =for apidoc mg_length
306 Reports on the SV's length in bytes, calling length magic if available,
307 but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
308 magic if there is no 'length' magic, but with no indication as to
309 whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310 higher. Use C<sv_len()> instead.
316 Perl_mg_length(pTHX_ SV *sv)
321 PERL_ARGS_ASSERT_MG_LENGTH;
323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
324 const MGVTBL * const vtbl = mg->mg_virtual;
325 if (vtbl && vtbl->svt_len) {
326 const I32 mgs_ix = SSNEW(sizeof(MGS));
327 save_magic(mgs_ix, sv);
328 /* omit MGf_GSKIP -- not changed here */
329 len = vtbl->svt_len(aTHX_ sv, mg);
330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
335 (void)SvPV_const(sv, len);
340 Perl_mg_size(pTHX_ SV *sv)
344 PERL_ARGS_ASSERT_MG_SIZE;
346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
347 const MGVTBL* const vtbl = mg->mg_virtual;
348 if (vtbl && vtbl->svt_len) {
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
351 save_magic(mgs_ix, sv);
352 /* omit MGf_GSKIP -- not changed here */
353 len = vtbl->svt_len(aTHX_ sv, mg);
354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
365 Perl_croak(aTHX_ "Size magic not implemented");
368 NOT_REACHED; /* NOTREACHED */
374 Clear something magical that the SV represents. See C<L</sv_magic>>.
380 Perl_mg_clear(pTHX_ SV *sv)
382 const I32 mgs_ix = SSNEW(sizeof(MGS));
386 PERL_ARGS_ASSERT_MG_CLEAR;
388 save_magic(mgs_ix, sv);
390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
391 const MGVTBL* const vtbl = mg->mg_virtual;
392 /* omit GSKIP -- never set here */
394 nextmg = mg->mg_moremagic; /* it may delete itself */
396 if (vtbl && vtbl->svt_clear)
397 vtbl->svt_clear(aTHX_ sv, mg);
400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
405 S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
425 Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
431 Perl_mg_find(const SV *sv, int type)
433 return S_mg_findext_flags(sv, type, NULL, 0);
437 =for apidoc mg_findext
439 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
446 Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
448 return S_mg_findext_flags(sv, type, vtbl, 1);
452 Perl_mg_find_mglob(pTHX_ SV *sv)
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
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
469 Copies the magic from one SV to another. See C<L</sv_magic>>.
475 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
480 PERL_ARGS_ASSERT_MG_COPY;
482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
483 const MGVTBL* const vtbl = mg->mg_virtual;
484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
488 const char type = mg->mg_type;
489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
491 (type == PERL_MAGIC_tied)
494 toLOWER(type), key, klen);
503 =for apidoc mg_localize
505 Copy some of the magic from an existing SV to new localized version of that
506 SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507 gets copied, value magic doesn't (I<e.g.>,
510 If C<setmagic> is false then no set magic will be called on the new (empty) SV.
511 This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
512 and that will handle the magic.
518 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
528 const MGVTBL* const vtbl = mg->mg_virtual;
529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
533 (void)vtbl->svt_local(aTHX_ nsv, mg);
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
538 /* container types should remain read-only across localization */
539 SvFLAGS(nsv) |= SvREADONLY(sv);
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
552 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
554 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
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));
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
573 Free any magic storage used by the SV. See C<L</sv_magic>>.
579 Perl_mg_free(pTHX_ SV *sv)
584 PERL_ARGS_ASSERT_MG_FREE;
586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
587 moremagic = mg->mg_moremagic;
588 mg_free_struct(sv, mg);
589 SvMAGIC_set(sv, moremagic);
591 SvMAGIC_set(sv, NULL);
597 =for apidoc Am|void|mg_free_type|SV *sv|int how
599 Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
605 Perl_mg_free_type(pTHX_ SV *sv, int how)
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
610 moremg = mg->mg_moremagic;
611 if (mg->mg_type == how) {
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
630 =for apidoc mg_freeext
632 Remove any magic of type C<how> using virtual table C<vtbl> from the
633 SV C<sv>. See L</sv_magic>.
635 C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
641 Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
643 MAGIC *mg, *prevmg, *moremg;
644 PERL_ARGS_ASSERT_MG_FREEEXT;
645 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
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 */
652 prevmg->mg_moremagic = moremg;
653 mg->mg_moremagic = SvMAGIC(sv);
656 newhead = mg->mg_moremagic;
657 mg_free_struct(sv, mg);
658 SvMAGIC_set(sv, newhead);
668 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
672 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
675 REGEXP * const rx = PM_GETRE(PL_curpm);
677 const SSize_t n = (SSize_t)mg->mg_obj;
678 if (n == '+') { /* @+ */
679 /* return the number possible */
680 return RX_NPARENS(rx);
681 } else { /* @- @^CAPTURE @{^CAPTURE} */
682 I32 paren = RX_LASTPAREN(rx);
684 /* return the last filled */
686 && (RX_OFFS(rx)[paren].start == -1
687 || RX_OFFS(rx)[paren].end == -1) )
693 /* @^CAPTURE @{^CAPTURE} */
694 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
706 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
708 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
711 REGEXP * const rx = PM_GETRE(PL_curpm);
713 const SSize_t n = (SSize_t)mg->mg_obj;
714 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
715 const I32 paren = mg->mg_len
716 + (n == '\003' ? 1 : 0);
721 if (paren <= (I32)RX_NPARENS(rx) &&
722 (s = RX_OFFS(rx)[paren].start) != -1 &&
723 (t = RX_OFFS(rx)[paren].end) != -1)
727 if (n == '+') /* @+ */
729 else if (n == '-') /* @- */
731 else { /* @^CAPTURE @{^CAPTURE} */
732 CALLREG_NUMBUF_FETCH(rx,paren,sv);
736 if (RX_MATCH_UTF8(rx)) {
737 const char * const b = RX_SUBBEG(rx);
739 i = RX_SUBCOFFSET(rx) +
741 (U8*)(b-RX_SUBOFFSET(rx)+i));
756 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
758 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
762 Perl_croak_no_modify();
763 NORETURN_FUNCTION_END;
766 #define SvRTRIM(sv) STMT_START { \
768 STRLEN len = SvCUR(sv); \
769 char * const p = SvPVX(sv); \
770 while (len > 0 && isSPACE(p[len-1])) \
772 SvCUR_set(sv, len); \
778 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
780 PERL_ARGS_ASSERT_EMULATE_COP_IO;
782 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
787 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
788 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
793 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
794 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
802 S_fixup_errno_string(pTHX_ SV* sv)
804 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
807 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
811 if(strEQ(SvPVX(sv), "")) {
812 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
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
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
820 * an entirely invariant string. We assume that if the string looks
821 * like UTF-8, it really is UTF-8: "text in any other encoding that
822 * uses bytes with the high bit set is extremely unlikely to pass a
823 * UTF-8 validity test"
824 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
825 * potential that we will get it wrong however, especially on short
826 * error message text, so do an additional check. */
827 if ( ! IN_BYTES /* respect 'use bytes' */
828 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
829 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv))
831 #ifdef USE_LOCALE_MESSAGES
833 && _is_cur_LC_category_utf8(LC_MESSAGES)
835 #elif defined(USE_LOCLAE_CTYPE)
837 /* For systems that don't have a separate message category,
838 * this assumes that they follow the CTYPE one */
839 && _is_cur_LC_category_utf8(LC_CTYPE)
850 =for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
852 Generates the message string describing an OS error and returns it as
853 an SV. C<errnum> must be a value that C<errno> could take, identifying
856 If C<tgtsv> is non-null then the string will be written into that SV
857 (overwriting existing content) and it will be returned. If C<tgtsv>
858 is a null pointer then the string will be written into a new mortal SV
859 which will be returned.
861 The message will be taken from whatever locale would be used by C<$!>,
862 and will be encoded in the SV in whatever manner would be used by C<$!>.
863 The details of this process are subject to future change. Currently,
864 the message is taken from the C locale by default (usually producing an
865 English message), and from the currently selected locale when in the scope
866 of the C<use locale> pragma. A heuristic attempt is made to decode the
867 message from the locale's character encoding, but it will only be decoded
868 as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
869 locale, usually in an ISO-8859-1 locale, and never in any other locale.
871 The SV is always returned containing an actual string, and with no other
872 OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
873 (meaning success), and if no useful message is available then a useless
874 string (currently empty) is returned.
880 Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
884 tgtsv = sv_newmortal();
885 errstr = my_strerror(errnum);
887 sv_setpv(tgtsv, errstr);
888 fixup_errno_string(tgtsv);
901 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
904 const char *s = NULL;
906 const char * const remaining = mg->mg_ptr + 1;
909 PERL_ARGS_ASSERT_MAGIC_GET;
913 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
915 CALLREG_NUMBUF_FETCH(rx,paren,sv);
922 nextchar = *remaining;
923 switch (*mg->mg_ptr) {
924 case '\001': /* ^A */
925 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
928 if (SvTAINTED(PL_bodytarget))
931 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
932 if (nextchar == '\0') {
933 sv_setiv(sv, (IV)PL_minus_c);
935 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
936 sv_setiv(sv, (IV)STATUS_NATIVE);
940 case '\004': /* ^D */
941 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
943 case '\005': /* ^E */
944 if (nextchar != '\0') {
945 if (strEQ(remaining, "NCODING"))
950 #if defined(VMS) || defined(OS2) || defined(WIN32)
954 $DESCRIPTOR(msgdsc,msg);
955 sv_setnv(sv,(NV) vaxc$errno);
956 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
957 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
962 if (!(_emx_env & 0x200)) { /* Under DOS */
963 sv_setnv(sv, (NV)errno);
964 sv_setpv(sv, errno ? my_strerror(errno) : "");
966 if (errno != errno_isOS2) {
967 const int tmp = _syserrno();
968 if (tmp) /* 2nd call to _syserrno() makes it 0 */
971 sv_setnv(sv, (NV)Perl_rc);
972 sv_setpv(sv, os2error(Perl_rc));
974 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
975 fixup_errno_string(sv);
977 # elif defined(WIN32)
979 const DWORD dwErr = GetLastError();
980 sv_setnv(sv, (NV)dwErr);
982 PerlProc_GetOSError(sv, dwErr);
983 fixup_errno_string(sv);
990 # error Missing code for platform
993 SvNOK_on(sv); /* what a wonderful hack! */
995 #endif /* End of platforms with special handling for $^E; others just fall
1003 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1005 sv_setnv(sv, (NV)errno);
1008 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1009 sv_setpv(sv, os2error(Perl_rc));
1016 sv_string_from_errnum(errno, sv);
1017 /* If no useful string is available, don't
1018 * claim to have a string part. The SvNOK_on()
1019 * below will cause just the number part to be valid */
1027 SvNOK_on(sv); /* what a wonderful hack! */
1030 case '\006': /* ^F */
1031 sv_setiv(sv, (IV)PL_maxsysfd);
1033 case '\007': /* ^GLOBAL_PHASE */
1034 if (strEQ(remaining, "LOBAL_PHASE")) {
1035 sv_setpvn(sv, PL_phase_names[PL_phase],
1036 strlen(PL_phase_names[PL_phase]));
1039 case '\010': /* ^H */
1040 sv_setuv(sv, PL_hints);
1042 case '\011': /* ^I */ /* NOT \t in EBCDIC */
1043 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
1045 case '\014': /* ^LAST_FH */
1046 if (strEQ(remaining, "AST_FH")) {
1047 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
1048 assert(isGV_with_GP(PL_last_in_gv));
1049 SV_CHECK_THINKFIRST_COW_DROP(sv);
1050 prepare_SV_for_RV(sv);
1052 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1060 case '\017': /* ^O & ^OPEN */
1061 if (nextchar == '\0') {
1062 sv_setpv(sv, PL_osname);
1065 else if (strEQ(remaining, "PEN")) {
1066 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
1070 sv_setiv(sv, (IV)PL_perldb);
1072 case '\023': /* ^S */
1074 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
1076 else if (PL_in_eval)
1077 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
1082 case '\024': /* ^T */
1083 if (nextchar == '\0') {
1085 sv_setnv(sv, PL_basetime);
1087 sv_setiv(sv, (IV)PL_basetime);
1090 else if (strEQ(remaining, "AINT"))
1091 sv_setiv(sv, TAINTING_get
1092 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
1095 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
1096 if (strEQ(remaining, "NICODE"))
1097 sv_setuv(sv, (UV) PL_unicode);
1098 else if (strEQ(remaining, "TF8LOCALE"))
1099 sv_setuv(sv, (UV) PL_utf8locale);
1100 else if (strEQ(remaining, "TF8CACHE"))
1101 sv_setiv(sv, (IV) PL_utf8cache);
1103 case '\027': /* ^W & $^WARNING_BITS */
1104 if (nextchar == '\0')
1105 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
1106 else if (strEQ(remaining, "ARNING_BITS")) {
1107 if (PL_compiling.cop_warnings == pWARN_NONE) {
1108 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
1110 else if (PL_compiling.cop_warnings == pWARN_STD) {
1113 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1114 /* Get the bit mask for $warnings::Bits{all}, because
1115 * it could have been extended by warnings::register */
1116 HV * const bits = get_hv("warnings::Bits", 0);
1117 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1119 sv_copypv(sv, *bits_all);
1121 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1124 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1125 *PL_compiling.cop_warnings);
1129 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1130 sv_setiv(sv, w32_sloppystat);
1135 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1136 paren = RX_LASTPAREN(rx);
1138 goto do_numbuf_fetch;
1141 case '\016': /* ^N */
1142 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1143 paren = RX_LASTCLOSEPAREN(rx);
1145 goto do_numbuf_fetch;
1149 if (GvIO(PL_last_in_gv)) {
1150 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1155 sv_setiv(sv, (IV)STATUS_CURRENT);
1156 #ifdef COMPLEX_STATUS
1157 SvUPGRADE(sv, SVt_PVLV);
1158 LvTARGOFF(sv) = PL_statusvalue;
1159 LvTARGLEN(sv) = PL_statusvalue_vms;
1164 if (GvIOp(PL_defoutgv))
1165 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1169 sv_setpv(sv,GvENAME(PL_defoutgv));
1170 sv_catpvs(sv,"_TOP");
1174 if (GvIOp(PL_defoutgv))
1175 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1177 s = GvENAME(PL_defoutgv);
1181 if (GvIO(PL_defoutgv))
1182 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1185 if (GvIO(PL_defoutgv))
1186 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1189 if (GvIO(PL_defoutgv))
1190 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1199 if (GvIO(PL_defoutgv))
1200 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1204 sv_copypv(sv, PL_ors_sv);
1210 IV const pid = (IV)PerlProc_getpid();
1211 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1212 /* never set manually, or at least not since last fork */
1214 /* never unsafe, even if reading in a tainted expression */
1217 /* else a value has been assigned manually, so do nothing */
1221 sv_setuid(sv, PerlProc_getuid());
1224 sv_setuid(sv, PerlProc_geteuid());
1227 sv_setgid(sv, PerlProc_getgid());
1230 sv_setgid(sv, PerlProc_getegid());
1232 #ifdef HAS_GETGROUPS
1234 Groups_t *gary = NULL;
1235 I32 num_groups = getgroups(0, gary);
1236 if (num_groups > 0) {
1238 Newx(gary, num_groups, Groups_t);
1239 num_groups = getgroups(num_groups, gary);
1240 for (i = 0; i < num_groups; i++)
1241 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
1245 (void)SvIOK_on(sv); /* what a wonderful hack! */
1259 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1261 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1263 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1265 if (uf && uf->uf_val)
1266 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1271 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1273 STRLEN len = 0, klen;
1274 const char * const key = MgPV_const(mg,klen);
1277 PERL_ARGS_ASSERT_MAGIC_SETENV;
1281 /* defined environment variables are byte strings; unfortunately
1282 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1283 (void)SvPV_force_nomg_nolen(sv);
1284 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1286 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1292 my_setenv(key, s); /* does the deed */
1294 #ifdef DYNAMIC_ENV_FETCH
1295 /* We just undefd an environment var. Is a replacement */
1296 /* waiting in the wings? */
1298 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1300 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1304 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1305 /* And you'll never guess what the dog had */
1306 /* in its mouth... */
1308 MgTAINTEDDIR_off(mg);
1310 if (s && memEQs(key, klen, "DCL$PATH")) {
1311 char pathbuf[256], eltbuf[256], *cp, *elt;
1314 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1316 do { /* DCL$PATH may be a search list */
1317 while (1) { /* as may dev portion of any element */
1318 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1319 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1320 cando_by_name(S_IWUSR,0,elt) ) {
1321 MgTAINTEDDIR_on(mg);
1325 if ((cp = strchr(elt, ':')) != NULL)
1327 if (my_trnlnm(elt, eltbuf, j++))
1333 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1336 if (s && memEQs(key, klen, "PATH")) {
1337 const char * const strend = s + len;
1339 /* set MGf_TAINTEDDIR if any component of the new path is
1340 * relative or world-writeable */
1341 while (s < strend) {
1345 #ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1346 const char path_sep = PL_perllib_sep;
1348 const char path_sep = ':';
1350 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
1351 s, strend, path_sep, &i);
1353 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1355 /* no colon thus no device name -- assume relative path */
1356 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1357 /* Using Unix separator, e.g. under bash, so act line Unix */
1358 || (PL_perllib_sep == ':' && *tmpbuf != '/')
1360 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1362 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1363 MgTAINTEDDIR_on(mg);
1369 #endif /* neither OS2 nor WIN32 nor MSDOS */
1375 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1377 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1378 PERL_UNUSED_ARG(sv);
1379 my_setenv(MgPV_nolen_const(mg),NULL);
1384 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1386 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1387 PERL_UNUSED_ARG(mg);
1389 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1391 if (PL_localizing) {
1394 hv_iterinit(MUTABLE_HV(sv));
1395 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1397 my_setenv(hv_iterkey(entry, &keylen),
1398 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1406 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1408 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1409 PERL_UNUSED_ARG(sv);
1410 PERL_UNUSED_ARG(mg);
1412 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1420 #ifdef HAS_SIGPROCMASK
1422 restore_sigmask(pTHX_ SV *save_sv)
1424 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1425 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1429 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1431 /* Are we fetching a signal entry? */
1432 int i = (I16)mg->mg_private;
1434 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1438 const char * sig = MgPV_const(mg, siglen);
1439 mg->mg_private = i = whichsig_pvn(sig, siglen);
1444 sv_setsv(sv,PL_psig_ptr[i]);
1446 Sighandler_t sigstate = rsignal_state(i);
1447 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1448 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1451 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1452 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1455 /* cache state so we don't fetch it again */
1456 if(sigstate == (Sighandler_t) SIG_IGN)
1457 sv_setpvs(sv,"IGNORE");
1460 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1467 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1469 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1471 magic_setsig(NULL, mg);
1472 return sv_unmagic(sv, mg->mg_type);
1476 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1477 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1479 Perl_csighandler(int sig)
1482 #ifdef PERL_GET_SIG_CONTEXT
1483 dTHXa(PERL_GET_SIG_CONTEXT);
1487 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1488 #if defined(__cplusplus) && defined(__GNUC__)
1489 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1490 * parameters would be warned about. */
1491 PERL_UNUSED_ARG(sip);
1492 PERL_UNUSED_ARG(uap);
1495 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1496 (void) rsignal(sig, PL_csighandlerp);
1497 if (PL_sig_ignoring[sig]) return;
1499 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1500 if (PL_sig_defaulting[sig])
1501 #ifdef KILL_BY_SIGPRC
1502 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1517 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1518 /* Call the perl level handler now--
1519 * with risk we may be in malloc() or being destructed etc. */
1520 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1521 (*PL_sighandlerp)(sig, NULL, NULL);
1523 (*PL_sighandlerp)(sig);
1526 if (!PL_psig_pend) return;
1527 /* Set a flag to say this signal is pending, that is awaiting delivery after
1528 * the current Perl opcode completes */
1529 PL_psig_pend[sig]++;
1531 #ifndef SIG_PENDING_DIE_COUNT
1532 # define SIG_PENDING_DIE_COUNT 120
1534 /* Add one to say _a_ signal is pending */
1535 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1536 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1537 (unsigned long)SIG_PENDING_DIE_COUNT);
1541 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1543 Perl_csighandler_init(void)
1546 if (PL_sig_handlers_initted) return;
1548 for (sig = 1; sig < SIG_SIZE; sig++) {
1549 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1551 PL_sig_defaulting[sig] = 1;
1552 (void) rsignal(sig, PL_csighandlerp);
1554 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1555 PL_sig_ignoring[sig] = 0;
1558 PL_sig_handlers_initted = 1;
1562 #if defined HAS_SIGPROCMASK
1564 unblock_sigmask(pTHX_ void* newset)
1566 PERL_UNUSED_CONTEXT;
1567 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1572 Perl_despatch_signals(pTHX)
1576 for (sig = 1; sig < SIG_SIZE; sig++) {
1577 if (PL_psig_pend[sig]) {
1579 #ifdef HAS_SIGPROCMASK
1580 /* From sigaction(2) (FreeBSD man page):
1581 * | Signal routines normally execute with the signal that
1582 * | caused their invocation blocked, but other signals may
1584 * Emulation of this behavior (from within Perl) is enabled
1588 sigset_t newset, oldset;
1590 sigemptyset(&newset);
1591 sigaddset(&newset, sig);
1592 sigprocmask(SIG_BLOCK, &newset, &oldset);
1593 was_blocked = sigismember(&oldset, sig);
1595 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1597 SAVEFREESV(save_sv);
1598 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1601 PL_psig_pend[sig] = 0;
1602 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1603 (*PL_sighandlerp)(sig, NULL, NULL);
1605 (*PL_sighandlerp)(sig);
1607 #ifdef HAS_SIGPROCMASK
1616 /* sv of NULL signifies that we're acting as magic_clearsig. */
1618 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1623 /* Need to be careful with SvREFCNT_dec(), because that can have side
1624 * effects (due to closures). We must make sure that the new disposition
1625 * is in place before it is called.
1629 #ifdef HAS_SIGPROCMASK
1633 const char *s = MgPV_const(mg,len);
1635 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1638 if (memEQs(s, len, "__DIE__"))
1640 else if (memEQs(s, len, "__WARN__")
1641 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1642 /* Merge the existing behaviours, which are as follows:
1643 magic_setsig, we always set svp to &PL_warnhook
1644 (hence we always change the warnings handler)
1645 For magic_clearsig, we don't change the warnings handler if it's
1646 set to the &PL_warnhook. */
1649 SV *tmp = sv_newmortal();
1650 Perl_croak(aTHX_ "No such hook: %s",
1651 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1655 if (*svp != PERL_WARNHOOK_FATAL)
1661 i = (I16)mg->mg_private;
1663 i = whichsig_pvn(s, len); /* ...no, a brick */
1664 mg->mg_private = (U16)i;
1668 SV *tmp = sv_newmortal();
1669 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1670 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1674 #ifdef HAS_SIGPROCMASK
1675 /* Avoid having the signal arrive at a bad time, if possible. */
1678 sigprocmask(SIG_BLOCK, &set, &save);
1680 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1681 SAVEFREESV(save_sv);
1682 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1685 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1686 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1688 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1689 PL_sig_ignoring[i] = 0;
1691 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1692 PL_sig_defaulting[i] = 0;
1694 to_dec = PL_psig_ptr[i];
1696 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1697 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1699 /* Signals don't change name during the program's execution, so once
1700 they're cached in the appropriate slot of PL_psig_name, they can
1703 Ideally we'd find some way of making SVs at (C) compile time, or
1704 at least, doing most of the work. */
1705 if (!PL_psig_name[i]) {
1706 PL_psig_name[i] = newSVpvn(s, len);
1707 SvREADONLY_on(PL_psig_name[i]);
1710 SvREFCNT_dec(PL_psig_name[i]);
1711 PL_psig_name[i] = NULL;
1712 PL_psig_ptr[i] = NULL;
1715 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1717 (void)rsignal(i, PL_csighandlerp);
1720 *svp = SvREFCNT_inc_simple_NN(sv);
1722 if (sv && SvOK(sv)) {
1723 s = SvPV_force(sv, len);
1727 if (sv && memEQs(s, len,"IGNORE")) {
1729 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1730 PL_sig_ignoring[i] = 1;
1731 (void)rsignal(i, PL_csighandlerp);
1733 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1737 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1739 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1740 PL_sig_defaulting[i] = 1;
1741 (void)rsignal(i, PL_csighandlerp);
1743 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1749 * We should warn if HINT_STRICT_REFS, but without
1750 * access to a known hint bit in a known OP, we can't
1751 * tell whether HINT_STRICT_REFS is in force or not.
1753 if (!strchr(s,':') && !strchr(s,'\''))
1754 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1757 (void)rsignal(i, PL_csighandlerp);
1759 *svp = SvREFCNT_inc_simple_NN(sv);
1763 #ifdef HAS_SIGPROCMASK
1767 SvREFCNT_dec(to_dec);
1770 #endif /* !PERL_MICRO */
1773 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1775 PERL_ARGS_ASSERT_MAGIC_SETISA;
1776 PERL_UNUSED_ARG(sv);
1778 /* Skip _isaelem because _isa will handle it shortly */
1779 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1782 return magic_clearisa(NULL, mg);
1785 /* sv of NULL signifies that we're acting as magic_setisa. */
1787 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1790 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1792 /* Bail out if destruction is going on */
1793 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1796 av_clear(MUTABLE_AV(sv));
1798 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1799 /* This occurs with setisa_elem magic, which calls this
1801 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1804 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1805 SV **svp = AvARRAY((AV *)mg->mg_obj);
1806 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1808 stash = GvSTASH((GV *)*svp++);
1809 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1816 (const GV *)mg->mg_obj
1819 /* The stash may have been detached from the symbol table, so check its
1820 name before doing anything. */
1821 if (stash && HvENAME_get(stash))
1822 mro_isa_changed_in(stash);
1828 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1830 HV * const hv = MUTABLE_HV(LvTARG(sv));
1833 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1834 PERL_UNUSED_ARG(mg);
1837 (void) hv_iterinit(hv);
1838 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1841 while (hv_iternext(hv))
1846 sv_setiv(sv, (IV)i);
1851 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1853 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1854 PERL_UNUSED_ARG(mg);
1856 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1862 =for apidoc magic_methcall
1864 Invoke a magic method (like FETCH).
1866 C<sv> and C<mg> are the tied thingy and the tie magic.
1868 C<meth> is the name of the method to call.
1870 C<argc> is the number of args (in addition to $self) to pass to the method.
1872 The C<flags> can be:
1874 G_DISCARD invoke method with G_DISCARD flag and don't
1876 G_UNDEF_FILL fill the stack with argc pointers to
1879 The arguments themselves are any values following the C<flags> argument.
1881 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1888 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1894 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1898 if (flags & G_WRITING_TO_STDERR) {
1902 SAVESPTR(PL_stderrgv);
1906 PUSHSTACKi(PERLSI_MAGIC);
1909 /* EXTEND() expects a signed argc; don't wrap when casting */
1910 assert(argc <= I32_MAX);
1911 EXTEND(SP, (I32)argc+1);
1912 PUSHs(SvTIED_obj(sv, mg));
1913 if (flags & G_UNDEF_FILL) {
1915 PUSHs(&PL_sv_undef);
1917 } else if (argc > 0) {
1919 va_start(args, argc);
1922 SV *const sv = va_arg(args, SV *);
1929 if (flags & G_DISCARD) {
1930 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1933 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1934 ret = *PL_stack_sp--;
1937 if (flags & G_WRITING_TO_STDERR)
1943 /* wrapper for magic_methcall that creates the first arg */
1946 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1951 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1954 if (mg->mg_len >= 0) {
1955 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1957 else if (mg->mg_len == HEf_SVKEY)
1958 arg1 = MUTABLE_SV(mg->mg_ptr);
1960 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1961 arg1 = newSViv((IV)(mg->mg_len));
1965 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1967 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1971 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
1975 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1977 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1984 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1986 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1988 if (mg->mg_type == PERL_MAGIC_tiedelem)
1989 mg->mg_flags |= MGf_GSKIP;
1990 magic_methpack(sv,mg,SV_CONST(FETCH));
1995 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
2000 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2002 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2003 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2004 * public flags indicate its value based on copying from $val. Doing
2005 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2006 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2007 * wrong if $val happened to be tainted, as sv hasn't got magic
2008 * enabled, even though taint magic is in the chain. In which case,
2009 * fake up a temporary tainted value (this is easier than temporarily
2010 * re-enabling magic on sv). */
2012 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
2013 && (tmg->mg_len & 1))
2015 val = sv_mortalcopy(sv);
2021 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
2026 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
2028 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2030 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
2031 return magic_methpack(sv,mg,SV_CONST(DELETE));
2036 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
2041 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2043 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
2045 retval = SvIV(retsv)-1;
2047 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
2049 return (U32) retval;
2053 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
2055 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2057 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
2062 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
2066 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2068 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2069 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
2076 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
2078 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2080 return magic_methpack(sv,mg,SV_CONST(EXISTS));
2084 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2087 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2088 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
2090 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2092 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2094 if (HvEITER_get(hv))
2095 /* we are in an iteration so the hash cannot be empty */
2097 /* no xhv_eiter so now use FIRSTKEY */
2098 key = sv_newmortal();
2099 magic_nextpack(MUTABLE_SV(hv), mg, key);
2100 HvEITER_set(hv, NULL); /* need to reset iterator */
2101 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2104 /* there is a SCALAR method that we can call */
2105 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2107 retval = &PL_sv_undef;
2112 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2116 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2118 /* The magic ptr/len for the debugger's hash should always be an SV. */
2119 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2120 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
2121 (IV)mg->mg_len, mg->mg_ptr);
2124 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2125 setting/clearing debugger breakpoints is not a hot path. */
2126 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2127 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2129 if (svp && SvIOKp(*svp)) {
2130 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2132 #ifdef PERL_DEBUG_READONLY_OPS
2133 Slab_to_rw(OpSLAB(o));
2135 /* set or clear breakpoint in the relevant control op */
2137 o->op_flags |= OPf_SPECIAL;
2139 o->op_flags &= ~OPf_SPECIAL;
2140 #ifdef PERL_DEBUG_READONLY_OPS
2141 Slab_to_ro(OpSLAB(o));
2149 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2151 AV * const obj = MUTABLE_AV(mg->mg_obj);
2153 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2156 sv_setiv(sv, AvFILL(obj));
2164 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2166 AV * const obj = MUTABLE_AV(mg->mg_obj);
2168 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2171 av_fill(obj, SvIV(sv));
2173 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2174 "Attempt to set length of freed array");
2180 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2182 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2183 PERL_UNUSED_ARG(sv);
2184 PERL_UNUSED_CONTEXT;
2186 /* Reset the iterator when the array is cleared */
2187 #if IVSIZE == I32SIZE
2188 *((IV *) &(mg->mg_len)) = 0;
2191 *((IV *) mg->mg_ptr) = 0;
2198 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2200 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2201 PERL_UNUSED_ARG(sv);
2203 /* during global destruction, mg_obj may already have been freed */
2204 if (PL_in_clean_all)
2207 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2210 /* arylen scalar holds a pointer back to the array, but doesn't own a
2211 reference. Hence the we (the array) are about to go away with it
2212 still pointing at us. Clear its pointer, else it would be pointing
2213 at free memory. See the comment in sv_magic about reference loops,
2214 and why it can't own a reference to us. */
2221 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2223 SV* const lsv = LvTARG(sv);
2224 MAGIC * const found = mg_find_mglob(lsv);
2226 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2227 PERL_UNUSED_ARG(mg);
2229 if (found && found->mg_len != -1) {
2230 STRLEN i = found->mg_len;
2231 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2232 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2241 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2243 SV* const lsv = LvTARG(sv);
2249 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2250 PERL_UNUSED_ARG(mg);
2252 found = mg_find_mglob(lsv);
2256 found = sv_magicext_mglob(lsv);
2258 else if (!SvOK(sv)) {
2262 s = SvPV_const(lsv, len);
2267 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
2277 else if (pos > (SSize_t)len)
2280 found->mg_len = pos;
2281 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2287 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2290 SV * const lsv = LvTARG(sv);
2291 const char * const tmps = SvPV_const(lsv,len);
2292 STRLEN offs = LvTARGOFF(sv);
2293 STRLEN rem = LvTARGLEN(sv);
2294 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2295 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
2297 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2298 PERL_UNUSED_ARG(mg);
2300 if (!translate_substr_offsets(
2301 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2302 negoff ? -(IV)offs : (IV)offs, !negoff,
2303 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2305 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2311 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2312 sv_setpvn(sv, tmps + offs, rem);
2319 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2321 STRLEN len, lsv_len, oldtarglen, newtarglen;
2322 const char * const tmps = SvPV_const(sv, len);
2323 SV * const lsv = LvTARG(sv);
2324 STRLEN lvoff = LvTARGOFF(sv);
2325 STRLEN lvlen = LvTARGLEN(sv);
2326 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2327 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
2329 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2330 PERL_UNUSED_ARG(mg);
2334 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2335 "Attempt to use reference as lvalue in substr"
2337 SvPV_force_nomg(lsv,lsv_len);
2338 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2339 if (!translate_substr_offsets(
2341 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2342 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2344 Perl_croak(aTHX_ "substr outside of string");
2347 sv_utf8_upgrade_nomg(lsv);
2348 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2349 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2350 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2353 else if (SvUTF8(lsv)) {
2355 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2357 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2358 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2362 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2365 if (!neglen) LvTARGLEN(sv) = newtarglen;
2366 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2372 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2374 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2375 PERL_UNUSED_ARG(sv);
2376 #ifdef NO_TAINT_SUPPORT
2377 PERL_UNUSED_ARG(mg);
2380 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2385 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2387 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2388 PERL_UNUSED_ARG(sv);
2390 /* update taint status */
2399 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2401 SV * const lsv = LvTARG(sv);
2402 char errflags = LvFLAGS(sv);
2404 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2405 PERL_UNUSED_ARG(mg);
2407 /* non-zero errflags implies deferred out-of-range condition */
2408 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
2409 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2415 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2417 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2418 PERL_UNUSED_ARG(mg);
2419 do_vecset(sv); /* XXX slurp this routine */
2424 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2427 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2428 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2430 if (LvTARGLEN(sv)) {
2432 SV * const ahv = LvTARG(sv);
2433 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2437 else if (LvSTARGOFF(sv) >= 0) {
2438 AV *const av = MUTABLE_AV(LvTARG(sv));
2439 if (LvSTARGOFF(sv) <= AvFILL(av))
2441 if (SvRMAGICAL(av)) {
2442 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2443 targ = svp ? *svp : NULL;
2446 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2449 if (targ && (targ != &PL_sv_undef)) {
2450 /* somebody else defined it for us */
2451 SvREFCNT_dec(LvTARG(sv));
2452 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2454 SvREFCNT_dec(mg->mg_obj);
2456 mg->mg_flags &= ~MGf_REFCOUNTED;
2465 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2467 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2469 sv_setsv(sv, defelem_target(sv, mg));
2474 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2476 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2477 PERL_UNUSED_ARG(mg);
2481 sv_setsv(LvTARG(sv), sv);
2482 SvSETMAGIC(LvTARG(sv));
2488 Perl_vivify_defelem(pTHX_ SV *sv)
2493 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2495 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2498 SV * const ahv = LvTARG(sv);
2499 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2502 if (!value || value == &PL_sv_undef)
2503 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2505 else if (LvSTARGOFF(sv) < 0)
2506 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2508 AV *const av = MUTABLE_AV(LvTARG(sv));
2509 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2510 LvTARG(sv) = NULL; /* array can't be extended */
2512 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2513 if (!svp || !(value = *svp))
2514 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2517 SvREFCNT_inc_simple_void(value);
2518 SvREFCNT_dec(LvTARG(sv));
2521 SvREFCNT_dec(mg->mg_obj);
2523 mg->mg_flags &= ~MGf_REFCOUNTED;
2527 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2529 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2530 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2535 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2537 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2538 PERL_UNUSED_CONTEXT;
2539 PERL_UNUSED_ARG(sv);
2545 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2547 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2549 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2551 if (uf && uf->uf_set)
2552 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2557 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2559 const char type = mg->mg_type;
2561 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2563 assert( type == PERL_MAGIC_fm
2564 || type == PERL_MAGIC_qr
2565 || type == PERL_MAGIC_bm);
2566 return sv_unmagic(sv, type);
2569 #ifdef USE_LOCALE_COLLATE
2571 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2573 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2576 * RenE<eacute> Descartes said "I think not."
2577 * and vanished with a faint plop.
2579 PERL_UNUSED_CONTEXT;
2580 PERL_UNUSED_ARG(sv);
2582 Safefree(mg->mg_ptr);
2588 #endif /* USE_LOCALE_COLLATE */
2590 /* Just clear the UTF-8 cache data. */
2592 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2594 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2595 PERL_UNUSED_CONTEXT;
2596 PERL_UNUSED_ARG(sv);
2597 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2599 mg->mg_len = -1; /* The mg_len holds the len cache. */
2604 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2606 const char *bad = NULL;
2607 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2608 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2609 switch (mg->mg_private & OPpLVREF_TYPE) {
2611 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2615 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2619 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2623 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2627 /* diag_listed_as: Assigned value is not %s reference */
2628 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2629 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2632 SV * const old = PAD_SV(mg->mg_len);
2633 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2638 gv_setref(mg->mg_obj, sv);
2639 SvSETMAGIC(mg->mg_obj);
2642 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2643 SvREFCNT_inc_simple_NN(SvRV(sv)));
2646 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2647 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2649 if (mg->mg_flags & MGf_PERSIST)
2650 NOOP; /* This sv is in use as an iterator var and will be reused,
2651 so we must leave the magic. */
2653 /* This sv could be returned by the assignment op, so clear the
2654 magic, as lvrefs are an implementation detail that must not be
2655 leaked to the user. */
2656 sv_unmagic(sv, PERL_MAGIC_lvref);
2661 S_set_dollarzero(pTHX_ SV *sv)
2662 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2669 #ifdef HAS_SETPROCTITLE
2670 /* The BSDs don't show the argv[] in ps(1) output, they
2671 * show a string from the process struct and provide
2672 * the setproctitle() routine to manipulate that. */
2673 if (PL_origalen != 1) {
2674 s = SvPV_const(sv, len);
2675 # if __FreeBSD_version > 410001 || defined(__DragonFly__)
2676 /* The leading "-" removes the "perl: " prefix,
2677 * but not the "(perl) suffix from the ps(1)
2678 * output, because that's what ps(1) shows if the
2679 * argv[] is modified. */
2680 setproctitle("-%s", s);
2681 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2682 /* This doesn't really work if you assume that
2683 * $0 = 'foobar'; will wipe out 'perl' from the $0
2684 * because in ps(1) output the result will be like
2685 * sprintf("perl: %s (perl)", s)
2686 * I guess this is a security feature:
2687 * one (a user process) cannot get rid of the original name.
2689 setproctitle("%s", s);
2692 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2693 if (PL_origalen != 1) {
2695 s = SvPV_const(sv, len);
2696 un.pst_command = (char *)s;
2697 pstat(PSTAT_SETCMD, un, len, 0, 0);
2700 if (PL_origalen > 1) {
2702 /* PL_origalen is set in perl_parse(). */
2703 s = SvPV_force(sv,len);
2704 if (len >= (STRLEN)PL_origalen-1) {
2705 /* Longer than original, will be truncated. We assume that
2706 * PL_origalen bytes are available. */
2707 Copy(s, PL_origargv[0], PL_origalen-1, char);
2710 /* Shorter than original, will be padded. */
2712 /* Special case for Mac OS X: see [perl #38868] */
2715 /* Is the space counterintuitive? Yes.
2716 * (You were expecting \0?)
2717 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2719 const int pad = ' ';
2721 Copy(s, PL_origargv[0], len, char);
2722 PL_origargv[0][len] = 0;
2723 memset(PL_origargv[0] + len + 1,
2724 pad, PL_origalen - len - 1);
2726 PL_origargv[0][PL_origalen-1] = 0;
2727 for (i = 1; i < PL_origargc; i++)
2729 #ifdef HAS_PRCTL_SET_NAME
2730 /* Set the legacy process name in addition to the POSIX name on Linux */
2731 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2732 /* diag_listed_as: SKIPME */
2733 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2741 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2752 PERL_ARGS_ASSERT_MAGIC_SET;
2756 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2758 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2760 /* Croak with a READONLY error when a numbered match var is
2761 * set without a previous pattern match. Unless it's C<local $1>
2764 if (!PL_localizing) {
2765 Perl_croak_no_modify();
2771 switch (*mg->mg_ptr) {
2772 case '\001': /* ^A */
2773 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2774 else SvOK_off(PL_bodytarget);
2775 FmLINES(PL_bodytarget) = 0;
2776 if (SvPOK(PL_bodytarget)) {
2777 char *s = SvPVX(PL_bodytarget);
2778 while ( ((s = strchr(s, '\n'))) ) {
2779 FmLINES(PL_bodytarget)++;
2783 /* mg_set() has temporarily made sv non-magical */
2785 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2786 SvTAINTED_on(PL_bodytarget);
2788 SvTAINTED_off(PL_bodytarget);
2791 case '\003': /* ^C */
2792 PL_minus_c = cBOOL(SvIV(sv));
2795 case '\004': /* ^D */
2798 const char *s = SvPV_nolen_const(sv);
2799 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2800 if (DEBUG_x_TEST || DEBUG_B_TEST)
2801 dump_all_perl(!DEBUG_B_TEST);
2804 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2807 case '\005': /* ^E */
2808 if (*(mg->mg_ptr+1) == '\0') {
2810 set_vaxc_errno(SvIV(sv));
2811 #elif defined(WIN32)
2812 SetLastError( SvIV(sv) );
2814 os2_setsyserrno(SvIV(sv));
2816 /* will anyone ever use this? */
2817 SETERRNO(SvIV(sv), 4);
2820 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2821 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
2823 case '\006': /* ^F */
2824 PL_maxsysfd = SvIV(sv);
2826 case '\010': /* ^H */
2828 U32 save_hints = PL_hints;
2829 PL_hints = SvUV(sv);
2831 /* If wasn't UTF-8, and now is, notify the parser */
2832 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2833 notify_parser_that_changed_to_utf8();
2837 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2838 Safefree(PL_inplace);
2839 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2841 case '\016': /* ^N */
2842 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2843 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2845 case '\017': /* ^O */
2846 if (*(mg->mg_ptr+1) == '\0') {
2847 Safefree(PL_osname);
2850 TAINT_PROPER("assigning to $^O");
2851 PL_osname = savesvpv(sv);
2854 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2856 const char *const start = SvPV(sv, len);
2857 const char *out = (const char*)memchr(start, '\0', len);
2861 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2862 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2864 /* Opening for input is more common than opening for output, so
2865 ensure that hints for input are sooner on linked list. */
2866 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2868 : newSVpvs_flags("", SvUTF8(sv));
2869 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2872 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2874 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2878 case '\020': /* ^P */
2879 PL_perldb = SvIV(sv);
2880 if (PL_perldb && !PL_DBsingle)
2883 case '\024': /* ^T */
2885 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2887 PL_basetime = (Time_t)SvIV(sv);
2890 case '\025': /* ^UTF8CACHE */
2891 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2892 PL_utf8cache = (signed char) sv_2iv(sv);
2895 case '\027': /* ^W & $^WARNING_BITS */
2896 if (*(mg->mg_ptr+1) == '\0') {
2897 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2899 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2900 | (i ? G_WARN_ON : G_WARN_OFF) ;
2903 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2904 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2906 PL_compiling.cop_warnings = pWARN_STD;
2911 int accumulate = 0 ;
2912 int any_fatals = 0 ;
2913 const char * const ptr = SvPV_const(sv, len) ;
2914 for (i = 0 ; i < len ; ++i) {
2915 accumulate |= ptr[i] ;
2916 any_fatals |= (ptr[i] & 0xAA) ;
2919 if (!specialWARN(PL_compiling.cop_warnings))
2920 PerlMemShared_free(PL_compiling.cop_warnings);
2921 PL_compiling.cop_warnings = pWARN_NONE;
2923 /* Yuck. I can't see how to abstract this: */
2925 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2929 if (!specialWARN(PL_compiling.cop_warnings))
2930 PerlMemShared_free(PL_compiling.cop_warnings);
2931 PL_compiling.cop_warnings = pWARN_ALL;
2932 PL_dowarn |= G_WARN_ONCE ;
2936 const char *const p = SvPV_const(sv, len);
2938 PL_compiling.cop_warnings
2939 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2942 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2943 PL_dowarn |= G_WARN_ONCE ;
2950 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2951 w32_sloppystat = (bool)sv_true(sv);
2956 if (PL_localizing) {
2957 if (PL_localizing == 1)
2958 SAVESPTR(PL_last_in_gv);
2960 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2961 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2964 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2965 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2966 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2969 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2970 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2971 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2974 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2977 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2978 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2979 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2982 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2986 IO * const io = GvIO(PL_defoutgv);
2989 if ((SvIV(sv)) == 0)
2990 IoFLAGS(io) &= ~IOf_FLUSH;
2992 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2993 PerlIO *ofp = IoOFP(io);
2995 (void)PerlIO_flush(ofp);
2996 IoFLAGS(io) |= IOf_FLUSH;
3004 SV *referent = SvRV(sv);
3005 const char *reftype = sv_reftype(referent, 0);
3006 /* XXX: dodgy type check: This leaves me feeling dirty, but
3007 * the alternative is to copy pretty much the entire
3008 * sv_reftype() into this routine, or to do a full string
3009 * comparison on the return of sv_reftype() both of which
3010 * make me feel worse! NOTE, do not modify this comment
3011 * without reviewing the corresponding comment in
3012 * sv_reftype(). - Yves */
3013 if (reftype[0] == 'S' || reftype[0] == 'L') {
3014 IV val = SvIV(referent);
3016 sv_setsv(sv, PL_rs);
3017 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3018 val < 0 ? "a negative integer" : "zero");
3021 sv_setsv(sv, PL_rs);
3022 /* diag_listed_as: Setting $/ to %s reference is forbidden */
3023 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3024 *reftype == 'A' ? "n" : "", reftype);
3027 SvREFCNT_dec(PL_rs);
3028 PL_rs = newSVsv(sv);
3032 SvREFCNT_dec(PL_ors_sv);
3034 PL_ors_sv = newSVsv(sv);
3042 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3045 #ifdef COMPLEX_STATUS
3046 if (PL_localizing == 2) {
3047 SvUPGRADE(sv, SVt_PVLV);
3048 PL_statusvalue = LvTARGOFF(sv);
3049 PL_statusvalue_vms = LvTARGLEN(sv);
3053 #ifdef VMSISH_STATUS
3055 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
3058 STATUS_UNIX_EXIT_SET(SvIV(sv));
3063 # define PERL_VMS_BANG vaxc$errno
3065 # define PERL_VMS_BANG 0
3067 #if defined(WIN32) && ! defined(UNDER_CE)
3068 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3069 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3071 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
3072 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3078 /* XXX $< currently silently ignores failures */
3079 const Uid_t new_uid = SvUID(sv);
3080 PL_delaymagic_uid = new_uid;
3081 if (PL_delaymagic) {
3082 PL_delaymagic |= DM_RUID;
3083 break; /* don't do magic till later */
3086 PERL_UNUSED_RESULT(setruid(new_uid));
3087 #elif defined(HAS_SETREUID)
3088 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
3089 #elif defined(HAS_SETRESUID)
3090 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
3092 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
3094 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
3095 if (new_uid != 0 && PerlProc_getuid() == 0)
3096 PERL_UNUSED_RESULT(PerlProc_setuid(0));
3098 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
3100 Perl_croak(aTHX_ "setruid() not implemented");
3107 /* XXX $> currently silently ignores failures */
3108 const Uid_t new_euid = SvUID(sv);
3109 PL_delaymagic_euid = new_euid;
3110 if (PL_delaymagic) {
3111 PL_delaymagic |= DM_EUID;
3112 break; /* don't do magic till later */
3115 PERL_UNUSED_RESULT(seteuid(new_euid));
3116 #elif defined(HAS_SETREUID)
3117 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
3118 #elif defined(HAS_SETRESUID)
3119 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
3121 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
3122 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3124 Perl_croak(aTHX_ "seteuid() not implemented");
3131 /* XXX $( currently silently ignores failures */
3132 const Gid_t new_gid = SvGID(sv);
3133 PL_delaymagic_gid = new_gid;
3134 if (PL_delaymagic) {
3135 PL_delaymagic |= DM_RGID;
3136 break; /* don't do magic till later */
3139 PERL_UNUSED_RESULT(setrgid(new_gid));
3140 #elif defined(HAS_SETREGID)
3141 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3142 #elif defined(HAS_SETRESGID)
3143 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3145 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3146 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3148 Perl_croak(aTHX_ "setrgid() not implemented");
3155 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3156 * but you can override it if you need to.
3159 #define INVALID_GID ((Gid_t)-1)
3161 /* XXX $) currently silently ignores failures */
3163 #ifdef HAS_SETGROUPS
3165 const char *p = SvPV_const(sv, len);
3166 Groups_t *gary = NULL;
3169 #ifdef _SC_NGROUPS_MAX
3170 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3175 int maxgrp = NGROUPS;
3180 if (grok_atoUV(p, &uv, &endptr))
3181 new_egid = (Gid_t)uv;
3183 new_egid = INVALID_GID;
3186 for (i = 0; i < maxgrp; ++i) {
3195 Newx(gary, i + 1, Groups_t);
3197 Renew(gary, i + 1, Groups_t);
3198 if (grok_atoUV(p, &uv, &endptr))
3199 gary[i] = (Groups_t)uv;
3201 gary[i] = INVALID_GID;
3206 PERL_UNUSED_RESULT(setgroups(i, gary));
3209 #else /* HAS_SETGROUPS */
3210 new_egid = SvGID(sv);
3211 #endif /* HAS_SETGROUPS */
3212 PL_delaymagic_egid = new_egid;
3213 if (PL_delaymagic) {
3214 PL_delaymagic |= DM_EGID;
3215 break; /* don't do magic till later */
3218 PERL_UNUSED_RESULT(setegid(new_egid));
3219 #elif defined(HAS_SETREGID)
3220 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3221 #elif defined(HAS_SETRESGID)
3222 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3224 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3225 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3227 Perl_croak(aTHX_ "setegid() not implemented");
3233 PL_chopset = SvPV_force(sv,len);
3236 /* Store the pid in mg->mg_obj so we can tell when a fork has
3237 occurred. mg->mg_obj points to *$ by default, so clear it. */
3238 if (isGV(mg->mg_obj)) {
3239 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3240 SvREFCNT_dec(mg->mg_obj);
3241 mg->mg_flags |= MGf_REFCOUNTED;
3242 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3244 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3247 LOCK_DOLLARZERO_MUTEX;
3248 S_set_dollarzero(aTHX_ sv);
3249 UNLOCK_DOLLARZERO_MUTEX;
3256 Perl_whichsig_sv(pTHX_ SV *sigsv)
3260 PERL_ARGS_ASSERT_WHICHSIG_SV;
3261 sigpv = SvPV_const(sigsv, siglen);
3262 return whichsig_pvn(sigpv, siglen);
3266 Perl_whichsig_pv(pTHX_ const char *sig)
3268 PERL_ARGS_ASSERT_WHICHSIG_PV;
3269 return whichsig_pvn(sig, strlen(sig));
3273 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3277 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3278 PERL_UNUSED_CONTEXT;
3280 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3281 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3282 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3284 if (memEQs(sig, len, "CHLD"))
3288 if (memEQs(sig, len, "CLD"))
3295 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3296 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3298 Perl_sighandler(int sig)
3301 #ifdef PERL_GET_SIG_CONTEXT
3302 dTHXa(PERL_GET_SIG_CONTEXT);
3309 SV * const tSv = PL_Sv;
3313 XPV * const tXpv = PL_Xpv;
3314 I32 old_ss_ix = PL_savestack_ix;
3315 SV *errsv_save = NULL;
3318 if (!PL_psig_ptr[sig]) {
3319 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3324 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3325 /* Max number of items pushed there is 3*n or 4. We cannot fix
3326 infinity, so we fix 4 (in fact 5): */
3327 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3329 PL_savestack_ix += 5; /* Protect save in progress. */
3330 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3333 /* sv_2cv is too complicated, try a simpler variant first: */
3334 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3335 || SvTYPE(cv) != SVt_PVCV) {
3337 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3340 if (!cv || !CvROOT(cv)) {
3341 const HEK * const hek = gv
3345 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3347 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3348 "SIG%s handler \"%" HEKf "\" not defined.\n",
3349 PL_sig_name[sig], HEKfARG(hek));
3350 /* diag_listed_as: SIG%s handler "%s" not defined */
3351 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3352 "SIG%s handler \"__ANON__\" not defined.\n",
3357 sv = PL_psig_name[sig]
3358 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3359 : newSVpv(PL_sig_name[sig],0);
3363 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3364 /* make sure our assumption about the size of the SAVEs are correct:
3365 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3366 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3369 PUSHSTACKi(PERLSI_SIGNAL);
3372 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3374 struct sigaction oact;
3376 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3379 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3380 /* The siginfo fields signo, code, errno, pid, uid,
3381 * addr, status, and band are defined by POSIX/SUSv3. */
3382 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3383 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3384 #ifdef HAS_SIGINFO_SI_ERRNO
3385 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3387 #ifdef HAS_SIGINFO_SI_STATUS
3388 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3390 #ifdef HAS_SIGINFO_SI_UID
3393 sv_setuid(uid, sip->si_uid);
3394 (void)hv_stores(sih, "uid", uid);
3397 #ifdef HAS_SIGINFO_SI_PID
3398 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3400 #ifdef HAS_SIGINFO_SI_ADDR
3401 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3403 #ifdef HAS_SIGINFO_SI_BAND
3404 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3408 mPUSHp((char *)sip, sizeof(*sip));
3416 errsv_save = newSVsv(ERRSV);
3418 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3422 SV * const errsv = ERRSV;
3423 if (SvTRUE_NN(errsv)) {
3424 SvREFCNT_dec(errsv_save);
3426 /* Handler "died", for example to get out of a restart-able read().
3427 * Before we re-do that on its behalf re-enable the signal which was
3428 * blocked by the system when we entered.
3430 #ifdef HAS_SIGPROCMASK
3431 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3437 sigaddset(&set,sig);
3438 sigprocmask(SIG_UNBLOCK, &set, NULL);
3441 /* Not clear if this will work */
3442 (void)rsignal(sig, SIG_IGN);
3443 (void)rsignal(sig, PL_csighandlerp);
3445 #endif /* !PERL_MICRO */
3449 sv_setsv(errsv, errsv_save);
3450 SvREFCNT_dec(errsv_save);
3455 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3456 PL_savestack_ix = old_ss_ix;
3458 SvREFCNT_dec_NN(sv);
3459 PL_op = myop; /* Apparently not needed... */
3461 PL_Sv = tSv; /* Restore global temporaries. */
3468 S_restore_magic(pTHX_ const void *p)
3470 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3471 SV* const sv = mgs->mgs_sv;
3477 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3478 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3480 SvFLAGS(sv) |= mgs->mgs_flags;
3485 bumped = mgs->mgs_bumped;
3486 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3488 /* If we're still on top of the stack, pop us off. (That condition
3489 * will be satisfied if restore_magic was called explicitly, but *not*
3490 * if it's being called via leave_scope.)
3491 * The reason for doing this is that otherwise, things like sv_2cv()
3492 * may leave alloc gunk on the savestack, and some code
3493 * (e.g. sighandler) doesn't expect that...
3495 if (PL_savestack_ix == mgs->mgs_ss_ix)
3497 UV popval = SSPOPUV;
3498 assert(popval == SAVEt_DESTRUCTOR_X);
3499 PL_savestack_ix -= 2;
3501 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3502 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3505 if (SvREFCNT(sv) == 1) {
3506 /* We hold the last reference to this SV, which implies that the
3507 SV was deleted as a side effect of the routines we called.
3508 So artificially keep it alive a bit longer.
3509 We avoid turning on the TEMP flag, which can cause the SV's
3510 buffer to get stolen (and maybe other stuff). */
3515 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3519 /* clean up the mess created by Perl_sighandler().
3520 * Note that this is only called during an exit in a signal handler;
3521 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3525 S_unwind_handler_stack(pTHX_ const void *p)
3529 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3533 =for apidoc magic_sethint
3535 Triggered by a store to C<%^H>, records the key/value pair to
3536 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3537 anything that would need a deep copy. Maybe we should warn if we find a
3543 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3545 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3546 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3548 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3550 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3551 an alternative leaf in there, with PL_compiling.cop_hints being used if
3552 it's NULL. If needed for threads, the alternative could lock a mutex,
3553 or take other more complex action. */
3555 /* Something changed in %^H, so it will need to be restored on scope exit.
3556 Doing this here saves a lot of doing it manually in perl code (and
3557 forgetting to do it, and consequent subtle errors. */
3558 PL_hints |= HINT_LOCALIZE_HH;
3559 CopHINTHASH_set(&PL_compiling,
3560 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3565 =for apidoc magic_clearhint
3567 Triggered by a delete from C<%^H>, records the key to
3568 C<PL_compiling.cop_hints_hash>.
3573 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3575 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3576 PERL_UNUSED_ARG(sv);
3578 PL_hints |= HINT_LOCALIZE_HH;
3579 CopHINTHASH_set(&PL_compiling,
3580 mg->mg_len == HEf_SVKEY
3581 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3582 MUTABLE_SV(mg->mg_ptr), 0, 0)
3583 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3584 mg->mg_ptr, mg->mg_len, 0, 0));
3589 =for apidoc magic_clearhints
3591 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3596 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3598 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3599 PERL_UNUSED_ARG(sv);
3600 PERL_UNUSED_ARG(mg);
3601 cophh_free(CopHINTHASH_get(&PL_compiling));
3602 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3607 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3608 const char *name, I32 namlen)
3612 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3613 PERL_UNUSED_ARG(sv);
3614 PERL_UNUSED_ARG(name);
3615 PERL_UNUSED_ARG(namlen);
3617 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3618 nmg = mg_find(nsv, mg->mg_type);
3620 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3621 nmg->mg_ptr = mg->mg_ptr;
3622 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3623 nmg->mg_flags |= MGf_REFCOUNTED;
3628 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3629 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3631 #if DBVARMG_SINGLE != 0
3632 assert(mg->mg_private >= DBVARMG_SINGLE);
3634 assert(mg->mg_private < DBVARMG_COUNT);
3636 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3642 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3643 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3645 #if DBVARMG_SINGLE != 0
3646 assert(mg->mg_private >= DBVARMG_SINGLE);
3648 assert(mg->mg_private < DBVARMG_COUNT);
3649 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3655 * ex: set ts=8 sts=4 sw=4 et: