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
21 "Magic" is special data attached to SV structures in order to give them
22 "magical" properties. When any Perl code tries to read from, or assign to,
23 an SV marked as magical, it calls the 'get' or 'set' function associated
24 with that SV's magic. A get is called prior to reading an SV, in order to
25 give it a chance to update its internal value (get on $. writes the line
26 number of the last read filehandle into to the SV's IV slot), while
27 set is called after an SV has been written to, in order to allow it to make
28 use of its changed value (set on $/ copies the SV's new value to the
29 PL_rs global variable).
31 Magic is implemented as a linked list of MAGIC structures attached to the
32 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33 of functions that implement the get(), set(), length() etc functions,
34 plus space for some flags and pointers. For example, a tied variable has
35 a MAGIC structure that contains a pointer to the object associated with the
44 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
50 #if defined(HAS_SETGROUPS)
57 # include <sys/pstat.h>
60 #ifdef HAS_PRCTL_SET_NAME
61 # include <sys/prctl.h>
64 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
65 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
67 Signal_t Perl_csighandler(int sig);
71 /* Missing protos on LynxOS */
72 void setruid(uid_t id);
73 void seteuid(uid_t id);
74 void setrgid(uid_t id);
75 void setegid(uid_t id);
79 * Pre-magic setup and post-magic takedown.
80 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
90 /* MGS is typedef'ed to struct magic_state in perl.h */
93 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
99 PERL_ARGS_ASSERT_SAVE_MAGIC;
101 assert(SvMAGICAL(sv));
103 /* we shouldn't really be called here with RC==0, but it can sometimes
104 * happen via mg_clear() (which also shouldn't be called when RC==0,
105 * but it can happen). Handle this case gracefully(ish) by not RC++
106 * and thus avoiding the resultant double free */
107 if (SvREFCNT(sv) > 0) {
108 /* guard against sv getting freed midway through the mg clearing,
109 * by holding a private reference for the duration. */
110 SvREFCNT_inc_simple_void_NN(sv);
114 /* Turning READONLY off for a copy-on-write scalar (including shared
115 hash keys) is a bad idea. */
117 sv_force_normal_flags(sv, 0);
119 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
121 mgs = SSPTR(mgs_ix, MGS*);
123 mgs->mgs_magical = SvMAGICAL(sv);
124 mgs->mgs_readonly = SvREADONLY(sv) != 0;
125 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
126 mgs->mgs_bumped = bumped;
133 =for apidoc mg_magical
135 Turns on the magical status of an SV. See C<sv_magic>.
141 Perl_mg_magical(pTHX_ SV *sv)
144 PERL_ARGS_ASSERT_MG_MAGICAL;
148 if ((mg = SvMAGIC(sv))) {
150 const MGVTBL* const vtbl = mg->mg_virtual;
152 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
159 } while ((mg = mg->mg_moremagic));
160 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
168 Do magic before a value is retrieved from the SV. See C<sv_magic>.
174 Perl_mg_get(pTHX_ SV *sv)
177 const I32 mgs_ix = SSNEW(sizeof(MGS));
180 MAGIC *newmg, *head, *cur, *mg;
182 PERL_ARGS_ASSERT_MG_GET;
184 if (PL_localizing == 1 && sv == DEFSV) return 0;
186 /* We must call svt_get(sv, mg) for each valid entry in the linked
187 list of magic. svt_get() may delete the current entry, add new
188 magic to the head of the list, or upgrade the SV. AMS 20010810 */
190 newmg = cur = head = mg = SvMAGIC(sv);
192 const MGVTBL * const vtbl = mg->mg_virtual;
193 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
195 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
197 /* taint's mg get is so dumb it doesn't need flag saving */
198 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
199 save_magic(mgs_ix, sv);
203 vtbl->svt_get(aTHX_ sv, mg);
205 /* guard against magic having been deleted - eg FETCH calling
208 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
212 /* recalculate flags if this entry was deleted. */
213 if (mg->mg_flags & MGf_GSKIP)
214 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
216 else if (vtbl == &PL_vtbl_utf8) {
217 /* get-magic can reallocate the PV */
218 magic_setutf8(sv, mg);
224 /* Have we finished with the new entries we saw? Start again
225 where we left off (unless there are more new entries). */
233 /* Were any new entries added? */
234 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
238 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
243 restore_magic(INT2PTR(void *, (IV)mgs_ix));
251 Do magic after a value is assigned to the SV. See C<sv_magic>.
257 Perl_mg_set(pTHX_ SV *sv)
260 const I32 mgs_ix = SSNEW(sizeof(MGS));
264 PERL_ARGS_ASSERT_MG_SET;
266 if (PL_localizing == 2 && sv == DEFSV) return 0;
268 save_magic(mgs_ix, sv);
270 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
271 const MGVTBL* vtbl = mg->mg_virtual;
272 nextmg = mg->mg_moremagic; /* it may delete itself */
273 if (mg->mg_flags & MGf_GSKIP) {
274 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
275 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
277 if (PL_localizing == 2
278 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
280 if (vtbl && vtbl->svt_set)
281 vtbl->svt_set(aTHX_ sv, mg);
284 restore_magic(INT2PTR(void*, (IV)mgs_ix));
289 =for apidoc mg_length
291 This function is deprecated.
293 It reports on the SV's length in bytes, calling length magic if available,
294 but does not set the UTF8 flag on the sv. It will fall back to 'get'
295 magic if there is no 'length' magic, but with no indication as to
296 whether it called 'get' magic. It assumes the sv is a PVMG or
297 higher. Use sv_len() instead.
303 Perl_mg_length(pTHX_ SV *sv)
309 PERL_ARGS_ASSERT_MG_LENGTH;
311 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
312 const MGVTBL * const vtbl = mg->mg_virtual;
313 if (vtbl && vtbl->svt_len) {
314 const I32 mgs_ix = SSNEW(sizeof(MGS));
315 save_magic(mgs_ix, sv);
316 /* omit MGf_GSKIP -- not changed here */
317 len = vtbl->svt_len(aTHX_ sv, mg);
318 restore_magic(INT2PTR(void*, (IV)mgs_ix));
323 (void)SvPV_const(sv, len);
328 Perl_mg_size(pTHX_ SV *sv)
332 PERL_ARGS_ASSERT_MG_SIZE;
334 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
335 const MGVTBL* const vtbl = mg->mg_virtual;
336 if (vtbl && vtbl->svt_len) {
337 const I32 mgs_ix = SSNEW(sizeof(MGS));
339 save_magic(mgs_ix, sv);
340 /* omit MGf_GSKIP -- not changed here */
341 len = vtbl->svt_len(aTHX_ sv, mg);
342 restore_magic(INT2PTR(void*, (IV)mgs_ix));
349 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
353 Perl_croak(aTHX_ "Size magic not implemented");
362 Clear something magical that the SV represents. See C<sv_magic>.
368 Perl_mg_clear(pTHX_ SV *sv)
370 const I32 mgs_ix = SSNEW(sizeof(MGS));
374 PERL_ARGS_ASSERT_MG_CLEAR;
376 save_magic(mgs_ix, sv);
378 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
379 const MGVTBL* const vtbl = mg->mg_virtual;
380 /* omit GSKIP -- never set here */
382 nextmg = mg->mg_moremagic; /* it may delete itself */
384 if (vtbl && vtbl->svt_clear)
385 vtbl->svt_clear(aTHX_ sv, mg);
388 restore_magic(INT2PTR(void*, (IV)mgs_ix));
393 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
402 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
403 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
415 Finds the magic pointer for type matching the SV. See C<sv_magic>.
421 Perl_mg_find(pTHX_ const SV *sv, int type)
423 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
427 =for apidoc mg_findext
429 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
436 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
438 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
444 Copies the magic from one SV to another. See C<sv_magic>.
450 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
455 PERL_ARGS_ASSERT_MG_COPY;
457 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
458 const MGVTBL* const vtbl = mg->mg_virtual;
459 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
460 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
463 const char type = mg->mg_type;
464 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
466 (type == PERL_MAGIC_tied)
468 : (type == PERL_MAGIC_regdata && mg->mg_obj)
471 toLOWER(type), key, klen);
480 =for apidoc mg_localize
482 Copy some of the magic from an existing SV to new localized version of that
483 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
486 If setmagic is false then no set magic will be called on the new (empty) SV.
487 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
488 and that will handle the magic.
494 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
499 PERL_ARGS_ASSERT_MG_LOCALIZE;
504 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
505 const MGVTBL* const vtbl = mg->mg_virtual;
506 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
509 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
510 (void)vtbl->svt_local(aTHX_ nsv, mg);
512 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
513 mg->mg_ptr, mg->mg_len);
515 /* container types should remain read-only across localization */
516 if (!SvIsCOW(sv)) SvFLAGS(nsv) |= SvREADONLY(sv);
519 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
520 SvFLAGS(nsv) |= SvMAGICAL(sv);
529 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
531 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
533 const MGVTBL* const vtbl = mg->mg_virtual;
534 if (vtbl && vtbl->svt_free)
535 vtbl->svt_free(aTHX_ sv, mg);
536 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
537 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
538 Safefree(mg->mg_ptr);
539 else if (mg->mg_len == HEf_SVKEY)
540 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
542 if (mg->mg_flags & MGf_REFCOUNTED)
543 SvREFCNT_dec(mg->mg_obj);
550 Free any magic storage used by the SV. See C<sv_magic>.
556 Perl_mg_free(pTHX_ SV *sv)
561 PERL_ARGS_ASSERT_MG_FREE;
563 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
564 moremagic = mg->mg_moremagic;
565 mg_free_struct(sv, mg);
566 SvMAGIC_set(sv, moremagic);
568 SvMAGIC_set(sv, NULL);
574 =for apidoc Am|void|mg_free_type|SV *sv|int how
576 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
582 Perl_mg_free_type(pTHX_ SV *sv, int how)
584 MAGIC *mg, *prevmg, *moremg;
585 PERL_ARGS_ASSERT_MG_FREE_TYPE;
586 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
588 moremg = mg->mg_moremagic;
589 if (mg->mg_type == how) {
590 /* temporarily move to the head of the magic chain, in case
591 custom free code relies on this historical aspect of mg_free */
593 prevmg->mg_moremagic = moremg;
594 mg->mg_moremagic = SvMAGIC(sv);
597 newhead = mg->mg_moremagic;
598 mg_free_struct(sv, mg);
599 SvMAGIC_set(sv, newhead);
609 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
614 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
617 const REGEXP * const rx = PM_GETRE(PL_curpm);
619 if (mg->mg_obj) { /* @+ */
620 /* return the number possible */
621 return RX_NPARENS(rx);
623 I32 paren = RX_LASTPAREN(rx);
625 /* return the last filled */
627 && (RX_OFFS(rx)[paren].start == -1
628 || RX_OFFS(rx)[paren].end == -1) )
641 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
645 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
648 const REGEXP * const rx = PM_GETRE(PL_curpm);
650 const I32 paren = mg->mg_len;
655 if (paren <= (I32)RX_NPARENS(rx) &&
656 (s = RX_OFFS(rx)[paren].start) != -1 &&
657 (t = RX_OFFS(rx)[paren].end) != -1)
660 if (mg->mg_obj) /* @+ */
665 if (i > 0 && RX_MATCH_UTF8(rx)) {
666 const char * const b = RX_SUBBEG(rx);
668 i = RX_SUBCOFFSET(rx) +
670 (U8*)(b-RX_SUBOFFSET(rx)+i));
683 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
685 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
688 Perl_croak_no_modify(aTHX);
689 NORETURN_FUNCTION_END;
693 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
699 const char * const remaining = mg->mg_ptr + 1;
701 PERL_ARGS_ASSERT_MAGIC_LEN;
703 switch (*mg->mg_ptr) {
705 if (*remaining == '\0') { /* ^P */
707 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
709 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
713 case '\015': /* $^MATCH */
714 if (strEQ(remaining, "ATCH")) {
721 paren = RX_BUFF_IDX_PREMATCH;
725 paren = RX_BUFF_IDX_POSTMATCH;
729 paren = RX_BUFF_IDX_FULLMATCH;
731 case '1': case '2': case '3': case '4':
732 case '5': case '6': case '7': case '8': case '9':
733 paren = atoi(mg->mg_ptr);
735 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
737 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
740 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
743 if (ckWARN(WARN_UNINITIALIZED))
748 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
749 paren = RX_LASTPAREN(rx);
754 case '\016': /* ^N */
755 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
756 paren = RX_LASTCLOSEPAREN(rx);
763 if (!SvPOK(sv) && SvNIOK(sv)) {
771 #define SvRTRIM(sv) STMT_START { \
773 STRLEN len = SvCUR(sv); \
774 char * const p = SvPVX(sv); \
775 while (len > 0 && isSPACE(p[len-1])) \
777 SvCUR_set(sv, len); \
783 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
785 PERL_ARGS_ASSERT_EMULATE_COP_IO;
787 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
788 sv_setsv(sv, &PL_sv_undef);
792 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
793 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
798 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
799 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
812 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
816 const char *s = NULL;
818 const char * const remaining = mg->mg_ptr + 1;
819 const char nextchar = *remaining;
821 PERL_ARGS_ASSERT_MAGIC_GET;
823 switch (*mg->mg_ptr) {
824 case '\001': /* ^A */
825 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
826 else sv_setsv(sv, &PL_sv_undef);
827 if (SvTAINTED(PL_bodytarget))
830 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
831 if (nextchar == '\0') {
832 sv_setiv(sv, (IV)PL_minus_c);
834 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
835 sv_setiv(sv, (IV)STATUS_NATIVE);
839 case '\004': /* ^D */
840 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
842 case '\005': /* ^E */
843 if (nextchar == '\0') {
847 $DESCRIPTOR(msgdsc,msg);
848 sv_setnv(sv,(NV) vaxc$errno);
849 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
850 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
855 if (!(_emx_env & 0x200)) { /* Under DOS */
856 sv_setnv(sv, (NV)errno);
857 sv_setpv(sv, errno ? Strerror(errno) : "");
859 if (errno != errno_isOS2) {
860 const int tmp = _syserrno();
861 if (tmp) /* 2nd call to _syserrno() makes it 0 */
864 sv_setnv(sv, (NV)Perl_rc);
865 sv_setpv(sv, os2error(Perl_rc));
869 const DWORD dwErr = GetLastError();
870 sv_setnv(sv, (NV)dwErr);
872 PerlProc_GetOSError(sv, dwErr);
881 sv_setnv(sv, (NV)errno);
882 sv_setpv(sv, errno ? Strerror(errno) : "");
887 SvNOK_on(sv); /* what a wonderful hack! */
889 else if (strEQ(remaining, "NCODING"))
890 sv_setsv(sv, PL_encoding);
892 case '\006': /* ^F */
893 sv_setiv(sv, (IV)PL_maxsysfd);
895 case '\007': /* ^GLOBAL_PHASE */
896 if (strEQ(remaining, "LOBAL_PHASE")) {
897 sv_setpvn(sv, PL_phase_names[PL_phase],
898 strlen(PL_phase_names[PL_phase]));
901 case '\010': /* ^H */
902 sv_setiv(sv, (IV)PL_hints);
904 case '\011': /* ^I */ /* NOT \t in EBCDIC */
905 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
907 case '\014': /* ^LAST_FH */
908 if (strEQ(remaining, "AST_FH")) {
910 assert(isGV_with_GP(PL_last_in_gv));
911 SV_CHECK_THINKFIRST_COW_DROP(sv);
912 prepare_SV_for_RV(sv);
914 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
918 else sv_setsv_nomg(sv, NULL);
921 case '\017': /* ^O & ^OPEN */
922 if (nextchar == '\0') {
923 sv_setpv(sv, PL_osname);
926 else if (strEQ(remaining, "PEN")) {
927 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
931 if (nextchar == '\0') { /* ^P */
932 sv_setiv(sv, (IV)PL_perldb);
933 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
935 paren = RX_BUFF_IDX_CARET_PREMATCH;
936 goto do_numbuf_fetch;
937 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
938 paren = RX_BUFF_IDX_CARET_POSTMATCH;
939 goto do_numbuf_fetch;
942 case '\023': /* ^S */
943 if (nextchar == '\0') {
944 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
947 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
952 case '\024': /* ^T */
953 if (nextchar == '\0') {
955 sv_setnv(sv, PL_basetime);
957 sv_setiv(sv, (IV)PL_basetime);
960 else if (strEQ(remaining, "AINT"))
961 sv_setiv(sv, PL_tainting
962 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
965 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
966 if (strEQ(remaining, "NICODE"))
967 sv_setuv(sv, (UV) PL_unicode);
968 else if (strEQ(remaining, "TF8LOCALE"))
969 sv_setuv(sv, (UV) PL_utf8locale);
970 else if (strEQ(remaining, "TF8CACHE"))
971 sv_setiv(sv, (IV) PL_utf8cache);
973 case '\027': /* ^W & $^WARNING_BITS */
974 if (nextchar == '\0')
975 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
976 else if (strEQ(remaining, "ARNING_BITS")) {
977 if (PL_compiling.cop_warnings == pWARN_NONE) {
978 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
980 else if (PL_compiling.cop_warnings == pWARN_STD) {
981 sv_setsv(sv, &PL_sv_undef);
984 else if (PL_compiling.cop_warnings == pWARN_ALL) {
985 /* Get the bit mask for $warnings::Bits{all}, because
986 * it could have been extended by warnings::register */
987 HV * const bits = get_hv("warnings::Bits", 0);
988 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
990 sv_copypv(sv, *bits_all);
992 sv_setpvn(sv, WARN_ALLstring, WARNsize);
995 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
996 *PL_compiling.cop_warnings);
1000 case '\015': /* $^MATCH */
1001 if (strEQ(remaining, "ATCH")) {
1002 paren = RX_BUFF_IDX_CARET_FULLMATCH;
1003 goto do_numbuf_fetch;
1006 case '1': case '2': case '3': case '4':
1007 case '5': case '6': case '7': case '8': case '9': case '&':
1009 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
1010 * XXX Does the new way break anything?
1012 paren = atoi(mg->mg_ptr); /* $& is in [0] */
1014 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1015 CALLREG_NUMBUF_FETCH(rx,paren,sv);
1018 sv_setsv(sv,&PL_sv_undef);
1021 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1022 paren = RX_LASTPAREN(rx);
1024 goto do_numbuf_fetch;
1026 sv_setsv(sv,&PL_sv_undef);
1028 case '\016': /* ^N */
1029 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1030 paren = RX_LASTCLOSEPAREN(rx);
1032 goto do_numbuf_fetch;
1034 sv_setsv(sv,&PL_sv_undef);
1037 paren = RX_BUFF_IDX_PREMATCH;
1038 goto do_numbuf_fetch;
1040 paren = RX_BUFF_IDX_POSTMATCH;
1041 goto do_numbuf_fetch;
1043 if (GvIO(PL_last_in_gv)) {
1044 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1049 sv_setiv(sv, (IV)STATUS_CURRENT);
1050 #ifdef COMPLEX_STATUS
1051 SvUPGRADE(sv, SVt_PVLV);
1052 LvTARGOFF(sv) = PL_statusvalue;
1053 LvTARGLEN(sv) = PL_statusvalue_vms;
1058 if (GvIOp(PL_defoutgv))
1059 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1063 sv_setpv(sv,GvENAME(PL_defoutgv));
1064 sv_catpvs(sv,"_TOP");
1068 if (GvIOp(PL_defoutgv))
1069 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1071 s = GvENAME(PL_defoutgv);
1075 if (GvIO(PL_defoutgv))
1076 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1079 if (GvIO(PL_defoutgv))
1080 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1083 if (GvIO(PL_defoutgv))
1084 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1094 if (GvIO(PL_defoutgv))
1095 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1099 sv_copypv(sv, PL_ors_sv);
1101 sv_setsv(sv, &PL_sv_undef);
1105 IV const pid = (IV)PerlProc_getpid();
1106 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1107 /* never set manually, or at least not since last fork */
1109 /* never unsafe, even if reading in a tainted expression */
1112 /* else a value has been assigned manually, so do nothing */
1120 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1122 sv_setnv(sv, (NV)errno);
1125 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1126 sv_setpv(sv, os2error(Perl_rc));
1129 sv_setpv(sv, errno ? Strerror(errno) : "");
1134 SvNOK_on(sv); /* what a wonderful hack! */
1137 sv_setiv(sv, (IV)PerlProc_getuid());
1140 sv_setiv(sv, (IV)PerlProc_geteuid());
1143 sv_setiv(sv, (IV)PerlProc_getgid());
1146 sv_setiv(sv, (IV)PerlProc_getegid());
1148 #ifdef HAS_GETGROUPS
1150 Groups_t *gary = NULL;
1151 I32 i, num_groups = getgroups(0, gary);
1152 Newx(gary, num_groups, Groups_t);
1153 num_groups = getgroups(num_groups, gary);
1154 for (i = 0; i < num_groups; i++)
1155 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1158 (void)SvIOK_on(sv); /* what a wonderful hack! */
1168 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1170 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1172 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1174 if (uf && uf->uf_val)
1175 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1180 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1183 STRLEN len = 0, klen;
1184 const char * const key = MgPV_const(mg,klen);
1185 const char *s = NULL;
1187 PERL_ARGS_ASSERT_MAGIC_SETENV;
1191 /* defined environment variables are byte strings; unfortunately
1192 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1193 (void)SvPV_force_nomg_nolen(sv);
1194 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1196 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1202 my_setenv(key, s); /* does the deed */
1204 #ifdef DYNAMIC_ENV_FETCH
1205 /* We just undefd an environment var. Is a replacement */
1206 /* waiting in the wings? */
1208 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1210 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1214 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1215 /* And you'll never guess what the dog had */
1216 /* in its mouth... */
1218 MgTAINTEDDIR_off(mg);
1220 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
1221 char pathbuf[256], eltbuf[256], *cp, *elt;
1224 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1226 do { /* DCL$PATH may be a search list */
1227 while (1) { /* as may dev portion of any element */
1228 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1229 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1230 cando_by_name(S_IWUSR,0,elt) ) {
1231 MgTAINTEDDIR_on(mg);
1235 if ((cp = strchr(elt, ':')) != NULL)
1237 if (my_trnlnm(elt, eltbuf, j++))
1243 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1246 if (s && klen == 4 && strEQ(key,"PATH")) {
1247 const char * const strend = s + len;
1249 while (s < strend) {
1253 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1254 const char path_sep = '|';
1256 const char path_sep = ':';
1258 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1259 s, strend, path_sep, &i);
1261 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1263 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1265 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1267 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1268 MgTAINTEDDIR_on(mg);
1274 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1280 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1282 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1283 PERL_UNUSED_ARG(sv);
1284 my_setenv(MgPV_nolen_const(mg),NULL);
1289 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1292 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1293 PERL_UNUSED_ARG(mg);
1295 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1297 if (PL_localizing) {
1300 hv_iterinit(MUTABLE_HV(sv));
1301 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1303 my_setenv(hv_iterkey(entry, &keylen),
1304 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1312 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1315 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1316 PERL_UNUSED_ARG(sv);
1317 PERL_UNUSED_ARG(mg);
1319 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1327 #ifdef HAS_SIGPROCMASK
1329 restore_sigmask(pTHX_ SV *save_sv)
1331 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1332 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1336 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1339 /* Are we fetching a signal entry? */
1340 int i = (I16)mg->mg_private;
1342 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1346 const char * sig = MgPV_const(mg, siglen);
1347 mg->mg_private = i = whichsig_pvn(sig, siglen);
1352 sv_setsv(sv,PL_psig_ptr[i]);
1354 Sighandler_t sigstate = rsignal_state(i);
1355 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1356 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1359 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1360 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1363 /* cache state so we don't fetch it again */
1364 if(sigstate == (Sighandler_t) SIG_IGN)
1365 sv_setpvs(sv,"IGNORE");
1367 sv_setsv(sv,&PL_sv_undef);
1368 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1375 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1377 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1379 magic_setsig(NULL, mg);
1380 return sv_unmagic(sv, mg->mg_type);
1384 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1385 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1387 Perl_csighandler(int sig)
1390 #ifdef PERL_GET_SIG_CONTEXT
1391 dTHXa(PERL_GET_SIG_CONTEXT);
1395 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1396 (void) rsignal(sig, PL_csighandlerp);
1397 if (PL_sig_ignoring[sig]) return;
1399 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1400 if (PL_sig_defaulting[sig])
1401 #ifdef KILL_BY_SIGPRC
1402 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1417 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1418 /* Call the perl level handler now--
1419 * with risk we may be in malloc() or being destructed etc. */
1420 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1421 (*PL_sighandlerp)(sig, NULL, NULL);
1423 (*PL_sighandlerp)(sig);
1426 if (!PL_psig_pend) return;
1427 /* Set a flag to say this signal is pending, that is awaiting delivery after
1428 * the current Perl opcode completes */
1429 PL_psig_pend[sig]++;
1431 #ifndef SIG_PENDING_DIE_COUNT
1432 # define SIG_PENDING_DIE_COUNT 120
1434 /* Add one to say _a_ signal is pending */
1435 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1436 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1437 (unsigned long)SIG_PENDING_DIE_COUNT);
1441 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1443 Perl_csighandler_init(void)
1446 if (PL_sig_handlers_initted) return;
1448 for (sig = 1; sig < SIG_SIZE; sig++) {
1449 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1451 PL_sig_defaulting[sig] = 1;
1452 (void) rsignal(sig, PL_csighandlerp);
1454 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1455 PL_sig_ignoring[sig] = 0;
1458 PL_sig_handlers_initted = 1;
1462 #if defined HAS_SIGPROCMASK
1464 unblock_sigmask(pTHX_ void* newset)
1466 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1471 Perl_despatch_signals(pTHX)
1476 for (sig = 1; sig < SIG_SIZE; sig++) {
1477 if (PL_psig_pend[sig]) {
1479 #ifdef HAS_SIGPROCMASK
1480 /* From sigaction(2) (FreeBSD man page):
1481 * | Signal routines normally execute with the signal that
1482 * | caused their invocation blocked, but other signals may
1484 * Emulation of this behavior (from within Perl) is enabled
1488 sigset_t newset, oldset;
1490 sigemptyset(&newset);
1491 sigaddset(&newset, sig);
1492 sigprocmask(SIG_BLOCK, &newset, &oldset);
1493 was_blocked = sigismember(&oldset, sig);
1495 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1497 SAVEFREESV(save_sv);
1498 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1501 PL_psig_pend[sig] = 0;
1502 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1503 (*PL_sighandlerp)(sig, NULL, NULL);
1505 (*PL_sighandlerp)(sig);
1507 #ifdef HAS_SIGPROCMASK
1516 /* sv of NULL signifies that we're acting as magic_clearsig. */
1518 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1523 /* Need to be careful with SvREFCNT_dec(), because that can have side
1524 * effects (due to closures). We must make sure that the new disposition
1525 * is in place before it is called.
1529 #ifdef HAS_SIGPROCMASK
1533 const char *s = MgPV_const(mg,len);
1535 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1538 if (memEQs(s, len, "__DIE__"))
1540 else if (memEQs(s, len, "__WARN__")
1541 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1542 /* Merge the existing behaviours, which are as follows:
1543 magic_setsig, we always set svp to &PL_warnhook
1544 (hence we always change the warnings handler)
1545 For magic_clearsig, we don't change the warnings handler if it's
1546 set to the &PL_warnhook. */
1549 SV *tmp = sv_newmortal();
1550 Perl_croak(aTHX_ "No such hook: %s",
1551 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1555 if (*svp != PERL_WARNHOOK_FATAL)
1561 i = (I16)mg->mg_private;
1563 i = whichsig_pvn(s, len); /* ...no, a brick */
1564 mg->mg_private = (U16)i;
1568 SV *tmp = sv_newmortal();
1569 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1570 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1574 #ifdef HAS_SIGPROCMASK
1575 /* Avoid having the signal arrive at a bad time, if possible. */
1578 sigprocmask(SIG_BLOCK, &set, &save);
1580 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1581 SAVEFREESV(save_sv);
1582 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1585 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1586 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1588 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1589 PL_sig_ignoring[i] = 0;
1591 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1592 PL_sig_defaulting[i] = 0;
1594 to_dec = PL_psig_ptr[i];
1596 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1597 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1599 /* Signals don't change name during the program's execution, so once
1600 they're cached in the appropriate slot of PL_psig_name, they can
1603 Ideally we'd find some way of making SVs at (C) compile time, or
1604 at least, doing most of the work. */
1605 if (!PL_psig_name[i]) {
1606 PL_psig_name[i] = newSVpvn(s, len);
1607 SvREADONLY_on(PL_psig_name[i]);
1610 SvREFCNT_dec(PL_psig_name[i]);
1611 PL_psig_name[i] = NULL;
1612 PL_psig_ptr[i] = NULL;
1615 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1617 (void)rsignal(i, PL_csighandlerp);
1620 *svp = SvREFCNT_inc_simple_NN(sv);
1622 if (sv && SvOK(sv)) {
1623 s = SvPV_force(sv, len);
1627 if (sv && memEQs(s, len,"IGNORE")) {
1629 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1630 PL_sig_ignoring[i] = 1;
1631 (void)rsignal(i, PL_csighandlerp);
1633 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1637 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1639 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1640 PL_sig_defaulting[i] = 1;
1641 (void)rsignal(i, PL_csighandlerp);
1643 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1649 * We should warn if HINT_STRICT_REFS, but without
1650 * access to a known hint bit in a known OP, we can't
1651 * tell whether HINT_STRICT_REFS is in force or not.
1653 if (!strchr(s,':') && !strchr(s,'\''))
1654 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1657 (void)rsignal(i, PL_csighandlerp);
1659 *svp = SvREFCNT_inc_simple_NN(sv);
1663 #ifdef HAS_SIGPROCMASK
1667 SvREFCNT_dec(to_dec);
1670 #endif /* !PERL_MICRO */
1673 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1676 PERL_ARGS_ASSERT_MAGIC_SETISA;
1677 PERL_UNUSED_ARG(sv);
1679 /* Skip _isaelem because _isa will handle it shortly */
1680 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1683 return magic_clearisa(NULL, mg);
1686 /* sv of NULL signifies that we're acting as magic_setisa. */
1688 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1693 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1695 /* Bail out if destruction is going on */
1696 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1699 av_clear(MUTABLE_AV(sv));
1701 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1702 /* This occurs with setisa_elem magic, which calls this
1704 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1706 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1707 SV **svp = AvARRAY((AV *)mg->mg_obj);
1708 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1710 stash = GvSTASH((GV *)*svp++);
1711 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1718 (const GV *)mg->mg_obj
1721 /* The stash may have been detached from the symbol table, so check its
1722 name before doing anything. */
1723 if (stash && HvENAME_get(stash))
1724 mro_isa_changed_in(stash);
1730 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1732 HV * const hv = MUTABLE_HV(LvTARG(sv));
1735 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1736 PERL_UNUSED_ARG(mg);
1739 (void) hv_iterinit(hv);
1740 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1743 while (hv_iternext(hv))
1748 sv_setiv(sv, (IV)i);
1753 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1755 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1756 PERL_UNUSED_ARG(mg);
1758 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1764 =for apidoc magic_methcall
1766 Invoke a magic method (like FETCH).
1768 C<sv> and C<mg> are the tied thingy and the tie magic.
1770 C<meth> is the name of the method to call.
1772 C<argc> is the number of args (in addition to $self) to pass to the method.
1774 The C<flags> can be:
1776 G_DISCARD invoke method with G_DISCARD flag and don't
1778 G_UNDEF_FILL fill the stack with argc pointers to
1781 The arguments themselves are any values following the C<flags> argument.
1783 Returns the SV (if any) returned by the method, or NULL on failure.
1790 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1797 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1801 if (flags & G_WRITING_TO_STDERR) {
1805 SAVESPTR(PL_stderrgv);
1809 PUSHSTACKi(PERLSI_MAGIC);
1813 PUSHs(SvTIED_obj(sv, mg));
1814 if (flags & G_UNDEF_FILL) {
1816 PUSHs(&PL_sv_undef);
1818 } else if (argc > 0) {
1820 va_start(args, argc);
1823 SV *const sv = va_arg(args, SV *);
1830 if (flags & G_DISCARD) {
1831 call_method(meth, G_SCALAR|G_DISCARD);
1834 if (call_method(meth, G_SCALAR))
1835 ret = *PL_stack_sp--;
1838 if (flags & G_WRITING_TO_STDERR)
1845 /* wrapper for magic_methcall that creates the first arg */
1848 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1854 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1857 if (mg->mg_len >= 0) {
1858 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1860 else if (mg->mg_len == HEf_SVKEY)
1861 arg1 = MUTABLE_SV(mg->mg_ptr);
1863 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1864 arg1 = newSViv((IV)(mg->mg_len));
1868 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1870 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1874 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1879 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1881 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1888 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1890 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1892 if (mg->mg_type == PERL_MAGIC_tiedelem)
1893 mg->mg_flags |= MGf_GSKIP;
1894 magic_methpack(sv,mg,"FETCH");
1899 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1905 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1907 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1908 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1909 * public flags indicate its value based on copying from $val. Doing
1910 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1911 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1912 * wrong if $val happened to be tainted, as sv hasn't got magic
1913 * enabled, even though taint magic is in the chain. In which case,
1914 * fake up a temporary tainted value (this is easier than temporarily
1915 * re-enabling magic on sv). */
1917 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1918 && (tmg->mg_len & 1))
1920 val = sv_mortalcopy(sv);
1926 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1931 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1933 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1935 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1936 return magic_methpack(sv,mg,"DELETE");
1941 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1947 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1949 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1951 retval = SvIV(retsv)-1;
1953 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1955 return (U32) retval;
1959 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1963 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1965 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1970 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1975 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1977 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1978 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1985 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1987 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1989 return magic_methpack(sv,mg,"EXISTS");
1993 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1997 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1998 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
2000 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2002 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2004 if (HvEITER_get(hv))
2005 /* we are in an iteration so the hash cannot be empty */
2007 /* no xhv_eiter so now use FIRSTKEY */
2008 key = sv_newmortal();
2009 magic_nextpack(MUTABLE_SV(hv), mg, key);
2010 HvEITER_set(hv, NULL); /* need to reset iterator */
2011 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2014 /* there is a SCALAR method that we can call */
2015 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
2017 retval = &PL_sv_undef;
2022 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2025 GV * const gv = PL_DBline;
2026 const I32 i = SvTRUE(sv);
2027 SV ** const svp = av_fetch(GvAV(gv),
2028 atoi(MgPV_nolen_const(mg)), FALSE);
2030 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2032 if (svp && SvIOKp(*svp)) {
2033 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2035 #ifdef PERL_DEBUG_READONLY_OPS
2036 Slab_to_rw(OpSLAB(o));
2038 /* set or clear breakpoint in the relevant control op */
2040 o->op_flags |= OPf_SPECIAL;
2042 o->op_flags &= ~OPf_SPECIAL;
2043 #ifdef PERL_DEBUG_READONLY_OPS
2044 Slab_to_ro(OpSLAB(o));
2052 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2055 AV * const obj = MUTABLE_AV(mg->mg_obj);
2057 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2060 sv_setiv(sv, AvFILL(obj));
2068 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2071 AV * const obj = MUTABLE_AV(mg->mg_obj);
2073 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2076 av_fill(obj, SvIV(sv));
2078 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2079 "Attempt to set length of freed array");
2085 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2089 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2090 PERL_UNUSED_ARG(sv);
2092 /* Reset the iterator when the array is cleared */
2093 #if IVSIZE == I32SIZE
2094 *((IV *) &(mg->mg_len)) = 0;
2097 *((IV *) mg->mg_ptr) = 0;
2104 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2108 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2109 PERL_UNUSED_ARG(sv);
2111 /* during global destruction, mg_obj may already have been freed */
2112 if (PL_in_clean_all)
2115 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2118 /* arylen scalar holds a pointer back to the array, but doesn't own a
2119 reference. Hence the we (the array) are about to go away with it
2120 still pointing at us. Clear its pointer, else it would be pointing
2121 at free memory. See the comment in sv_magic about reference loops,
2122 and why it can't own a reference to us. */
2129 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2132 SV* const lsv = LvTARG(sv);
2134 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2135 PERL_UNUSED_ARG(mg);
2137 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2138 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2139 if (found && found->mg_len >= 0) {
2140 I32 i = found->mg_len;
2142 sv_pos_b2u(lsv, &i);
2152 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2155 SV* const lsv = LvTARG(sv);
2162 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2163 PERL_UNUSED_ARG(mg);
2165 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2166 found = mg_find(lsv, PERL_MAGIC_regex_global);
2172 #ifdef PERL_OLD_COPY_ON_WRITE
2174 sv_force_normal_flags(lsv, 0);
2176 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2179 else if (!SvOK(sv)) {
2183 s = SvPV_const(lsv, len);
2188 ulen = sv_or_pv_len_utf8(lsv, s, len);
2198 else if (pos > (SSize_t)len)
2202 pos = sv_or_pv_pos_u2b(lsv, s, pos, 0);
2205 found->mg_len = pos;
2206 found->mg_flags &= ~MGf_MINMATCH;
2212 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2215 SV * const lsv = LvTARG(sv);
2216 const char * const tmps = SvPV_const(lsv,len);
2217 STRLEN offs = LvTARGOFF(sv);
2218 STRLEN rem = LvTARGLEN(sv);
2219 const bool negoff = LvFLAGS(sv) & 1;
2220 const bool negrem = LvFLAGS(sv) & 2;
2222 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2223 PERL_UNUSED_ARG(mg);
2225 if (!translate_substr_offsets(
2226 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2227 negoff ? -(IV)offs : (IV)offs, !negoff,
2228 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2230 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2231 sv_setsv_nomg(sv, &PL_sv_undef);
2236 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2237 sv_setpvn(sv, tmps + offs, rem);
2244 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2247 STRLEN len, lsv_len, oldtarglen, newtarglen;
2248 const char * const tmps = SvPV_const(sv, len);
2250 SV * const lsv = LvTARG(sv);
2251 STRLEN lvoff = LvTARGOFF(sv);
2252 STRLEN lvlen = LvTARGLEN(sv);
2253 const bool negoff = LvFLAGS(sv) & 1;
2254 const bool neglen = LvFLAGS(sv) & 2;
2256 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2257 PERL_UNUSED_ARG(mg);
2261 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2262 "Attempt to use reference as lvalue in substr"
2264 targs = SvPV_nomg(lsv,lsv_len);
2265 if (SvUTF8(lsv)) lsv_len = sv_or_pv_len_utf8(lsv,targs,lsv_len);
2266 if (!translate_substr_offsets(
2268 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2269 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2271 Perl_croak(aTHX_ "substr outside of string");
2274 sv_utf8_upgrade_nomg(lsv);
2275 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2276 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2277 newtarglen = sv_len_utf8(sv);
2280 else if (lsv && SvUTF8(lsv)) {
2282 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2284 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2285 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2289 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2292 if (!neglen) LvTARGLEN(sv) = newtarglen;
2293 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2299 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2303 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2304 PERL_UNUSED_ARG(sv);
2306 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2311 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2315 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2316 PERL_UNUSED_ARG(sv);
2318 /* update taint status */
2327 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2329 SV * const lsv = LvTARG(sv);
2331 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2332 PERL_UNUSED_ARG(mg);
2335 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2343 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2345 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2346 PERL_UNUSED_ARG(mg);
2347 do_vecset(sv); /* XXX slurp this routine */
2352 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2357 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2359 if (LvTARGLEN(sv)) {
2361 SV * const ahv = LvTARG(sv);
2362 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2367 AV *const av = MUTABLE_AV(LvTARG(sv));
2368 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2369 targ = AvARRAY(av)[LvTARGOFF(sv)];
2371 if (targ && (targ != &PL_sv_undef)) {
2372 /* somebody else defined it for us */
2373 SvREFCNT_dec(LvTARG(sv));
2374 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2376 SvREFCNT_dec(mg->mg_obj);
2378 mg->mg_flags &= ~MGf_REFCOUNTED;
2383 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2388 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2390 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2391 PERL_UNUSED_ARG(mg);
2395 sv_setsv(LvTARG(sv), sv);
2396 SvSETMAGIC(LvTARG(sv));
2402 Perl_vivify_defelem(pTHX_ SV *sv)
2408 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2410 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2413 SV * const ahv = LvTARG(sv);
2414 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2417 if (!value || value == &PL_sv_undef)
2418 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2421 AV *const av = MUTABLE_AV(LvTARG(sv));
2422 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2423 LvTARG(sv) = NULL; /* array can't be extended */
2425 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2426 if (!svp || (value = *svp) == &PL_sv_undef)
2427 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2430 SvREFCNT_inc_simple_void(value);
2431 SvREFCNT_dec(LvTARG(sv));
2434 SvREFCNT_dec(mg->mg_obj);
2436 mg->mg_flags &= ~MGf_REFCOUNTED;
2440 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2442 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2443 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2448 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2450 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2451 PERL_UNUSED_CONTEXT;
2452 PERL_UNUSED_ARG(sv);
2458 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2460 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2462 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2464 if (uf && uf->uf_set)
2465 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2470 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2472 const char type = mg->mg_type;
2474 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2476 if (type == PERL_MAGIC_qr) {
2477 } else if (type == PERL_MAGIC_bm) {
2481 assert(type == PERL_MAGIC_fm);
2483 return sv_unmagic(sv, type);
2486 #ifdef USE_LOCALE_COLLATE
2488 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2490 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2493 * RenE<eacute> Descartes said "I think not."
2494 * and vanished with a faint plop.
2496 PERL_UNUSED_CONTEXT;
2497 PERL_UNUSED_ARG(sv);
2499 Safefree(mg->mg_ptr);
2505 #endif /* USE_LOCALE_COLLATE */
2507 /* Just clear the UTF-8 cache data. */
2509 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2511 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2512 PERL_UNUSED_CONTEXT;
2513 PERL_UNUSED_ARG(sv);
2514 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2516 mg->mg_len = -1; /* The mg_len holds the len cache. */
2521 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2527 const char * const remaining = mg->mg_ptr + 1;
2532 PERL_ARGS_ASSERT_MAGIC_SET;
2534 switch (*mg->mg_ptr) {
2535 case '\015': /* $^MATCH */
2536 if (strEQ(remaining, "ATCH"))
2538 case '`': /* ${^PREMATCH} caught below */
2540 paren = RX_BUFF_IDX_PREMATCH;
2542 case '\'': /* ${^POSTMATCH} caught below */
2544 paren = RX_BUFF_IDX_POSTMATCH;
2548 paren = RX_BUFF_IDX_FULLMATCH;
2550 case '1': case '2': case '3': case '4':
2551 case '5': case '6': case '7': case '8': case '9':
2552 paren = atoi(mg->mg_ptr);
2554 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2556 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2558 /* Croak with a READONLY error when a numbered match var is
2559 * set without a previous pattern match. Unless it's C<local $1>
2562 if (!PL_localizing) {
2563 Perl_croak_no_modify(aTHX);
2567 case '\001': /* ^A */
2568 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2569 else SvOK_off(PL_bodytarget);
2570 FmLINES(PL_bodytarget) = 0;
2571 if (SvPOK(PL_bodytarget)) {
2572 char *s = SvPVX(PL_bodytarget);
2573 while ( ((s = strchr(s, '\n'))) ) {
2574 FmLINES(PL_bodytarget)++;
2578 /* mg_set() has temporarily made sv non-magical */
2580 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2581 SvTAINTED_on(PL_bodytarget);
2583 SvTAINTED_off(PL_bodytarget);
2586 case '\003': /* ^C */
2587 PL_minus_c = cBOOL(SvIV(sv));
2590 case '\004': /* ^D */
2592 s = SvPV_nolen_const(sv);
2593 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2594 if (DEBUG_x_TEST || DEBUG_B_TEST)
2595 dump_all_perl(!DEBUG_B_TEST);
2597 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2600 case '\005': /* ^E */
2601 if (*(mg->mg_ptr+1) == '\0') {
2603 set_vaxc_errno(SvIV(sv));
2606 SetLastError( SvIV(sv) );
2609 os2_setsyserrno(SvIV(sv));
2611 /* will anyone ever use this? */
2612 SETERRNO(SvIV(sv), 4);
2617 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2618 SvREFCNT_dec(PL_encoding);
2619 if (SvOK(sv) || SvGMAGICAL(sv)) {
2620 PL_encoding = newSVsv(sv);
2627 case '\006': /* ^F */
2628 PL_maxsysfd = SvIV(sv);
2630 case '\010': /* ^H */
2631 PL_hints = SvIV(sv);
2633 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2634 Safefree(PL_inplace);
2635 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2637 case '\016': /* ^N */
2638 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2639 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2641 case '\017': /* ^O */
2642 if (*(mg->mg_ptr+1) == '\0') {
2643 Safefree(PL_osname);
2646 TAINT_PROPER("assigning to $^O");
2647 PL_osname = savesvpv(sv);
2650 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2652 const char *const start = SvPV(sv, len);
2653 const char *out = (const char*)memchr(start, '\0', len);
2657 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2658 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2660 /* Opening for input is more common than opening for output, so
2661 ensure that hints for input are sooner on linked list. */
2662 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2664 : newSVpvs_flags("", SvUTF8(sv));
2665 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2668 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2670 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2674 case '\020': /* ^P */
2675 if (*remaining == '\0') { /* ^P */
2676 PL_perldb = SvIV(sv);
2677 if (PL_perldb && !PL_DBsingle)
2680 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2682 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2686 case '\024': /* ^T */
2688 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2690 PL_basetime = (Time_t)SvIV(sv);
2693 case '\025': /* ^UTF8CACHE */
2694 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2695 PL_utf8cache = (signed char) sv_2iv(sv);
2698 case '\027': /* ^W & $^WARNING_BITS */
2699 if (*(mg->mg_ptr+1) == '\0') {
2700 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2702 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2703 | (i ? G_WARN_ON : G_WARN_OFF) ;
2706 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2707 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2709 PL_compiling.cop_warnings = pWARN_STD;
2714 int accumulate = 0 ;
2715 int any_fatals = 0 ;
2716 const char * const ptr = SvPV_const(sv, len) ;
2717 for (i = 0 ; i < len ; ++i) {
2718 accumulate |= ptr[i] ;
2719 any_fatals |= (ptr[i] & 0xAA) ;
2722 if (!specialWARN(PL_compiling.cop_warnings))
2723 PerlMemShared_free(PL_compiling.cop_warnings);
2724 PL_compiling.cop_warnings = pWARN_NONE;
2726 /* Yuck. I can't see how to abstract this: */
2727 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2728 WARN_ALL) && !any_fatals) {
2729 if (!specialWARN(PL_compiling.cop_warnings))
2730 PerlMemShared_free(PL_compiling.cop_warnings);
2731 PL_compiling.cop_warnings = pWARN_ALL;
2732 PL_dowarn |= G_WARN_ONCE ;
2736 const char *const p = SvPV_const(sv, len);
2738 PL_compiling.cop_warnings
2739 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2742 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2743 PL_dowarn |= G_WARN_ONCE ;
2751 if (PL_localizing) {
2752 if (PL_localizing == 1)
2753 SAVESPTR(PL_last_in_gv);
2755 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2756 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2759 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2760 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2761 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2764 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2765 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2766 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2769 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2772 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2773 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2774 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2777 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2781 IO * const io = GvIO(PL_defoutgv);
2784 if ((SvIV(sv)) == 0)
2785 IoFLAGS(io) &= ~IOf_FLUSH;
2787 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2788 PerlIO *ofp = IoOFP(io);
2790 (void)PerlIO_flush(ofp);
2791 IoFLAGS(io) |= IOf_FLUSH;
2797 SvREFCNT_dec(PL_rs);
2798 PL_rs = newSVsv(sv);
2801 SvREFCNT_dec(PL_ors_sv);
2803 PL_ors_sv = newSVsv(sv);
2811 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2814 #ifdef COMPLEX_STATUS
2815 if (PL_localizing == 2) {
2816 SvUPGRADE(sv, SVt_PVLV);
2817 PL_statusvalue = LvTARGOFF(sv);
2818 PL_statusvalue_vms = LvTARGLEN(sv);
2822 #ifdef VMSISH_STATUS
2824 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2827 STATUS_UNIX_EXIT_SET(SvIV(sv));
2832 # define PERL_VMS_BANG vaxc$errno
2834 # define PERL_VMS_BANG 0
2836 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2837 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2842 const IV new_uid = SvIV(sv);
2843 PL_delaymagic_uid = new_uid;
2844 if (PL_delaymagic) {
2845 PL_delaymagic |= DM_RUID;
2846 break; /* don't do magic till later */
2849 (void)setruid((Uid_t)new_uid);
2852 (void)setreuid((Uid_t)new_uid, (Uid_t)-1);
2854 #ifdef HAS_SETRESUID
2855 (void)setresuid((Uid_t)new_uid, (Uid_t)-1, (Uid_t)-1);
2857 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2859 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2860 if (new_uid != 0 && PerlProc_getuid() == 0)
2861 (void)PerlProc_setuid(0);
2863 (void)PerlProc_setuid(new_uid);
2865 Perl_croak(aTHX_ "setruid() not implemented");
2874 const UV new_euid = SvIV(sv);
2875 PL_delaymagic_euid = new_euid;
2876 if (PL_delaymagic) {
2877 PL_delaymagic |= DM_EUID;
2878 break; /* don't do magic till later */
2881 (void)seteuid((Uid_t)new_euid);
2884 (void)setreuid((Uid_t)-1, (Uid_t)new_euid);
2886 #ifdef HAS_SETRESUID
2887 (void)setresuid((Uid_t)-1, (Uid_t)new_euid, (Uid_t)-1);
2889 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
2890 PerlProc_setuid(new_euid);
2892 Perl_croak(aTHX_ "seteuid() not implemented");
2901 const UV new_gid = SvIV(sv);
2902 PL_delaymagic_gid = new_gid;
2903 if (PL_delaymagic) {
2904 PL_delaymagic |= DM_RGID;
2905 break; /* don't do magic till later */
2908 (void)setrgid((Gid_t)new_gid);
2911 (void)setregid((Gid_t)new_gid, (Gid_t)-1);
2913 #ifdef HAS_SETRESGID
2914 (void)setresgid((Gid_t)new_gid, (Gid_t)-1, (Gid_t) -1);
2916 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
2917 (void)PerlProc_setgid(new_gid);
2919 Perl_croak(aTHX_ "setrgid() not implemented");
2929 #ifdef HAS_SETGROUPS
2931 const char *p = SvPV_const(sv, len);
2932 Groups_t *gary = NULL;
2933 #ifdef _SC_NGROUPS_MAX
2934 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2939 int maxgrp = NGROUPS;
2945 for (i = 0; i < maxgrp; ++i) {
2946 while (*p && !isSPACE(*p))
2953 Newx(gary, i + 1, Groups_t);
2955 Renew(gary, i + 1, Groups_t);
2959 (void)setgroups(i, gary);
2962 #else /* HAS_SETGROUPS */
2963 new_egid = SvIV(sv);
2964 #endif /* HAS_SETGROUPS */
2965 PL_delaymagic_egid = new_egid;
2966 if (PL_delaymagic) {
2967 PL_delaymagic |= DM_EGID;
2968 break; /* don't do magic till later */
2971 (void)setegid((Gid_t)new_egid);
2974 (void)setregid((Gid_t)-1, (Gid_t)new_egid);
2976 #ifdef HAS_SETRESGID
2977 (void)setresgid((Gid_t)-1, (Gid_t)new_egid, (Gid_t)-1);
2979 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
2980 (void)PerlProc_setgid(new_egid);
2982 Perl_croak(aTHX_ "setegid() not implemented");
2990 PL_chopset = SvPV_force(sv,len);
2993 /* Store the pid in mg->mg_obj so we can tell when a fork has
2994 occurred. mg->mg_obj points to *$ by default, so clear it. */
2995 if (isGV(mg->mg_obj)) {
2996 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2997 SvREFCNT_dec(mg->mg_obj);
2998 mg->mg_flags |= MGf_REFCOUNTED;
2999 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3001 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3004 LOCK_DOLLARZERO_MUTEX;
3005 #ifdef HAS_SETPROCTITLE
3006 /* The BSDs don't show the argv[] in ps(1) output, they
3007 * show a string from the process struct and provide
3008 * the setproctitle() routine to manipulate that. */
3009 if (PL_origalen != 1) {
3010 s = SvPV_const(sv, len);
3011 # if __FreeBSD_version > 410001
3012 /* The leading "-" removes the "perl: " prefix,
3013 * but not the "(perl) suffix from the ps(1)
3014 * output, because that's what ps(1) shows if the
3015 * argv[] is modified. */
3016 setproctitle("-%s", s);
3017 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
3018 /* This doesn't really work if you assume that
3019 * $0 = 'foobar'; will wipe out 'perl' from the $0
3020 * because in ps(1) output the result will be like
3021 * sprintf("perl: %s (perl)", s)
3022 * I guess this is a security feature:
3023 * one (a user process) cannot get rid of the original name.
3025 setproctitle("%s", s);
3028 #elif defined(__hpux) && defined(PSTAT_SETCMD)
3029 if (PL_origalen != 1) {
3031 s = SvPV_const(sv, len);
3032 un.pst_command = (char *)s;
3033 pstat(PSTAT_SETCMD, un, len, 0, 0);
3036 if (PL_origalen > 1) {
3037 /* PL_origalen is set in perl_parse(). */
3038 s = SvPV_force(sv,len);
3039 if (len >= (STRLEN)PL_origalen-1) {
3040 /* Longer than original, will be truncated. We assume that
3041 * PL_origalen bytes are available. */
3042 Copy(s, PL_origargv[0], PL_origalen-1, char);
3045 /* Shorter than original, will be padded. */
3047 /* Special case for Mac OS X: see [perl #38868] */
3050 /* Is the space counterintuitive? Yes.
3051 * (You were expecting \0?)
3052 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3054 const int pad = ' ';
3056 Copy(s, PL_origargv[0], len, char);
3057 PL_origargv[0][len] = 0;
3058 memset(PL_origargv[0] + len + 1,
3059 pad, PL_origalen - len - 1);
3061 PL_origargv[0][PL_origalen-1] = 0;
3062 for (i = 1; i < PL_origargc; i++)
3064 #ifdef HAS_PRCTL_SET_NAME
3065 /* Set the legacy process name in addition to the POSIX name on Linux */
3066 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3067 /* diag_listed_as: SKIPME */
3068 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3073 UNLOCK_DOLLARZERO_MUTEX;
3080 Perl_whichsig_sv(pTHX_ SV *sigsv)
3084 PERL_ARGS_ASSERT_WHICHSIG_SV;
3085 PERL_UNUSED_CONTEXT;
3086 sigpv = SvPV_const(sigsv, siglen);
3087 return whichsig_pvn(sigpv, siglen);
3091 Perl_whichsig_pv(pTHX_ const char *sig)
3093 PERL_ARGS_ASSERT_WHICHSIG_PV;
3094 PERL_UNUSED_CONTEXT;
3095 return whichsig_pvn(sig, strlen(sig));
3099 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3103 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3104 PERL_UNUSED_CONTEXT;
3106 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3107 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3108 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3110 if (memEQs(sig, len, "CHLD"))
3114 if (memEQs(sig, len, "CLD"))
3121 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3122 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3124 Perl_sighandler(int sig)
3127 #ifdef PERL_GET_SIG_CONTEXT
3128 dTHXa(PERL_GET_SIG_CONTEXT);
3135 SV * const tSv = PL_Sv;
3139 XPV * const tXpv = PL_Xpv;
3140 I32 old_ss_ix = PL_savestack_ix;
3141 SV *errsv_save = NULL;
3144 if (!PL_psig_ptr[sig]) {
3145 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3150 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3151 /* Max number of items pushed there is 3*n or 4. We cannot fix
3152 infinity, so we fix 4 (in fact 5): */
3153 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3155 PL_savestack_ix += 5; /* Protect save in progress. */
3156 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3159 /* sv_2cv is too complicated, try a simpler variant first: */
3160 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3161 || SvTYPE(cv) != SVt_PVCV) {
3163 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3166 if (!cv || !CvROOT(cv)) {
3167 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3168 PL_sig_name[sig], (gv ? GvENAME(gv)
3175 sv = PL_psig_name[sig]
3176 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3177 : newSVpv(PL_sig_name[sig],0);
3181 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3182 /* make sure our assumption about the size of the SAVEs are correct:
3183 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3184 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3187 PUSHSTACKi(PERLSI_SIGNAL);
3190 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3192 struct sigaction oact;
3194 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3197 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3198 /* The siginfo fields signo, code, errno, pid, uid,
3199 * addr, status, and band are defined by POSIX/SUSv3. */
3200 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3201 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3202 #if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */
3203 hv_stores(sih, "errno", newSViv(sip->si_errno));
3204 hv_stores(sih, "status", newSViv(sip->si_status));
3205 hv_stores(sih, "uid", newSViv(sip->si_uid));
3206 hv_stores(sih, "pid", newSViv(sip->si_pid));
3207 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3208 hv_stores(sih, "band", newSViv(sip->si_band));
3212 mPUSHp((char *)sip, sizeof(*sip));
3220 errsv_save = newSVsv(ERRSV);
3222 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3225 if (SvTRUE(ERRSV)) {
3226 SvREFCNT_dec(errsv_save);
3228 /* Handler "died", for example to get out of a restart-able read().
3229 * Before we re-do that on its behalf re-enable the signal which was
3230 * blocked by the system when we entered.
3232 #ifdef HAS_SIGPROCMASK
3233 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3239 sigaddset(&set,sig);
3240 sigprocmask(SIG_UNBLOCK, &set, NULL);
3243 /* Not clear if this will work */
3244 (void)rsignal(sig, SIG_IGN);
3245 (void)rsignal(sig, PL_csighandlerp);
3247 #endif /* !PERL_MICRO */
3251 sv_setsv(ERRSV, errsv_save);
3252 SvREFCNT_dec(errsv_save);
3256 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3257 PL_savestack_ix = old_ss_ix;
3260 PL_op = myop; /* Apparently not needed... */
3262 PL_Sv = tSv; /* Restore global temporaries. */
3269 S_restore_magic(pTHX_ const void *p)
3272 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3273 SV* const sv = mgs->mgs_sv;
3279 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3280 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3281 #ifdef PERL_OLD_COPY_ON_WRITE
3282 /* While magic was saved (and off) sv_setsv may well have seen
3283 this SV as a prime candidate for COW. */
3285 sv_force_normal_flags(sv, 0);
3287 if (mgs->mgs_readonly)
3289 if (mgs->mgs_magical)
3290 SvFLAGS(sv) |= mgs->mgs_magical;
3295 bumped = mgs->mgs_bumped;
3296 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3298 /* If we're still on top of the stack, pop us off. (That condition
3299 * will be satisfied if restore_magic was called explicitly, but *not*
3300 * if it's being called via leave_scope.)
3301 * The reason for doing this is that otherwise, things like sv_2cv()
3302 * may leave alloc gunk on the savestack, and some code
3303 * (e.g. sighandler) doesn't expect that...
3305 if (PL_savestack_ix == mgs->mgs_ss_ix)
3307 UV popval = SSPOPUV;
3308 assert(popval == SAVEt_DESTRUCTOR_X);
3309 PL_savestack_ix -= 2;
3311 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3312 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3315 if (SvREFCNT(sv) == 1) {
3316 /* We hold the last reference to this SV, which implies that the
3317 SV was deleted as a side effect of the routines we called.
3318 So artificially keep it alive a bit longer.
3319 We avoid turning on the TEMP flag, which can cause the SV's
3320 buffer to get stolen (and maybe other stuff). */
3325 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
3329 /* clean up the mess created by Perl_sighandler().
3330 * Note that this is only called during an exit in a signal handler;
3331 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3335 S_unwind_handler_stack(pTHX_ const void *p)
3340 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3344 =for apidoc magic_sethint
3346 Triggered by a store to %^H, records the key/value pair to
3347 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3348 anything that would need a deep copy. Maybe we should warn if we find a
3354 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3357 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3358 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3360 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3362 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3363 an alternative leaf in there, with PL_compiling.cop_hints being used if
3364 it's NULL. If needed for threads, the alternative could lock a mutex,
3365 or take other more complex action. */
3367 /* Something changed in %^H, so it will need to be restored on scope exit.
3368 Doing this here saves a lot of doing it manually in perl code (and
3369 forgetting to do it, and consequent subtle errors. */
3370 PL_hints |= HINT_LOCALIZE_HH;
3371 CopHINTHASH_set(&PL_compiling,
3372 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3377 =for apidoc magic_clearhint
3379 Triggered by a delete from %^H, records the key to
3380 C<PL_compiling.cop_hints_hash>.
3385 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3389 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3390 PERL_UNUSED_ARG(sv);
3392 PL_hints |= HINT_LOCALIZE_HH;
3393 CopHINTHASH_set(&PL_compiling,
3394 mg->mg_len == HEf_SVKEY
3395 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3396 MUTABLE_SV(mg->mg_ptr), 0, 0)
3397 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3398 mg->mg_ptr, mg->mg_len, 0, 0));
3403 =for apidoc magic_clearhints
3405 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3410 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3412 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3413 PERL_UNUSED_ARG(sv);
3414 PERL_UNUSED_ARG(mg);
3415 cophh_free(CopHINTHASH_get(&PL_compiling));
3416 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3421 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3422 const char *name, I32 namlen)
3426 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3427 PERL_UNUSED_ARG(sv);
3428 PERL_UNUSED_ARG(name);
3429 PERL_UNUSED_ARG(namlen);
3431 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3432 nmg = mg_find(nsv, mg->mg_type);
3433 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3434 nmg->mg_ptr = mg->mg_ptr;
3435 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3436 nmg->mg_flags |= MGf_REFCOUNTED;
3442 * c-indentation-style: bsd
3444 * indent-tabs-mode: nil
3447 * ex: set ts=8 sts=4 sw=4 et: