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 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
89 /* MGS is typedef'ed to struct magic_state in perl.h */
92 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
98 PERL_ARGS_ASSERT_SAVE_MAGIC;
100 /* we shouldn't really be called here with RC==0, but it can sometimes
101 * happen via mg_clear() (which also shouldn't be called when RC==0,
102 * but it can happen). Handle this case gracefully(ish) by not RC++
103 * and thus avoiding the resultant double free */
104 if (SvREFCNT(sv) > 0) {
105 /* guard against sv getting freed midway through the mg clearing,
106 * by holding a private reference for the duration. */
107 SvREFCNT_inc_simple_void_NN(sv);
111 assert(SvMAGICAL(sv));
112 /* Turning READONLY off for a copy-on-write scalar (including shared
113 hash keys) is a bad idea. */
115 sv_force_normal_flags(sv, 0);
117 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
119 mgs = SSPTR(mgs_ix, MGS*);
121 mgs->mgs_magical = SvMAGICAL(sv);
122 mgs->mgs_readonly = SvREADONLY(sv) != 0;
123 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
124 mgs->mgs_bumped = bumped;
128 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
129 /* No public flags are set, so promote any private flags to public. */
130 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
135 =for apidoc mg_magical
137 Turns on the magical status of an SV. See C<sv_magic>.
143 Perl_mg_magical(pTHX_ SV *sv)
146 PERL_ARGS_ASSERT_MG_MAGICAL;
150 if ((mg = SvMAGIC(sv))) {
152 const MGVTBL* const vtbl = mg->mg_virtual;
154 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
161 } while ((mg = mg->mg_moremagic));
162 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
170 Do magic after a value is retrieved from the SV. See C<sv_magic>.
176 Perl_mg_get(pTHX_ SV *sv)
179 const I32 mgs_ix = SSNEW(sizeof(MGS));
181 MAGIC *newmg, *head, *cur, *mg;
183 PERL_ARGS_ASSERT_MG_GET;
185 save_magic(mgs_ix, sv);
187 /* We must call svt_get(sv, mg) for each valid entry in the linked
188 list of magic. svt_get() may delete the current entry, add new
189 magic to the head of the list, or upgrade the SV. AMS 20010810 */
191 newmg = cur = head = mg = SvMAGIC(sv);
193 const MGVTBL * const vtbl = mg->mg_virtual;
194 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
196 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
197 vtbl->svt_get(aTHX_ sv, mg);
199 /* guard against magic having been deleted - eg FETCH calling
202 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
206 /* recalculate flags if this entry was deleted. */
207 if (mg->mg_flags & MGf_GSKIP)
208 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
214 /* Have we finished with the new entries we saw? Start again
215 where we left off (unless there are more new entries). */
223 /* Were any new entries added? */
224 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
228 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
232 restore_magic(INT2PTR(void *, (IV)mgs_ix));
239 Do magic after a value is assigned to the SV. See C<sv_magic>.
245 Perl_mg_set(pTHX_ SV *sv)
248 const I32 mgs_ix = SSNEW(sizeof(MGS));
252 PERL_ARGS_ASSERT_MG_SET;
254 save_magic(mgs_ix, sv);
256 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
257 const MGVTBL* vtbl = mg->mg_virtual;
258 nextmg = mg->mg_moremagic; /* it may delete itself */
259 if (mg->mg_flags & MGf_GSKIP) {
260 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
261 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
263 if (PL_localizing == 2
264 && (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type) || sv == DEFSV))
266 if (vtbl && vtbl->svt_set)
267 vtbl->svt_set(aTHX_ sv, mg);
270 restore_magic(INT2PTR(void*, (IV)mgs_ix));
275 =for apidoc mg_length
277 Report on the SV's length. See C<sv_magic>.
283 Perl_mg_length(pTHX_ SV *sv)
289 PERL_ARGS_ASSERT_MG_LENGTH;
291 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
292 const MGVTBL * const vtbl = mg->mg_virtual;
293 if (vtbl && vtbl->svt_len) {
294 const I32 mgs_ix = SSNEW(sizeof(MGS));
295 save_magic(mgs_ix, sv);
296 /* omit MGf_GSKIP -- not changed here */
297 len = vtbl->svt_len(aTHX_ sv, mg);
298 restore_magic(INT2PTR(void*, (IV)mgs_ix));
304 /* You can't know whether it's UTF-8 until you get the string again...
306 const U8 *s = (U8*)SvPV_const(sv, len);
309 len = utf8_length(s, s + len);
316 Perl_mg_size(pTHX_ SV *sv)
320 PERL_ARGS_ASSERT_MG_SIZE;
322 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
323 const MGVTBL* const vtbl = mg->mg_virtual;
324 if (vtbl && vtbl->svt_len) {
325 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));
337 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
341 Perl_croak(aTHX_ "Size magic not implemented");
350 Clear something magical that the SV represents. See C<sv_magic>.
356 Perl_mg_clear(pTHX_ SV *sv)
358 const I32 mgs_ix = SSNEW(sizeof(MGS));
362 PERL_ARGS_ASSERT_MG_CLEAR;
364 save_magic(mgs_ix, sv);
366 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
367 const MGVTBL* const vtbl = mg->mg_virtual;
368 /* omit GSKIP -- never set here */
370 nextmg = mg->mg_moremagic; /* it may delete itself */
372 if (vtbl && vtbl->svt_clear)
373 vtbl->svt_clear(aTHX_ sv, mg);
376 restore_magic(INT2PTR(void*, (IV)mgs_ix));
381 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
390 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
391 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
403 Finds the magic pointer for type matching the SV. See C<sv_magic>.
409 Perl_mg_find(pTHX_ const SV *sv, int type)
411 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
415 =for apidoc mg_findext
417 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
424 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
426 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
432 Copies the magic from one SV to another. See C<sv_magic>.
438 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
443 PERL_ARGS_ASSERT_MG_COPY;
445 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
446 const MGVTBL* const vtbl = mg->mg_virtual;
447 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
448 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
451 const char type = mg->mg_type;
452 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
454 (type == PERL_MAGIC_tied)
456 : (type == PERL_MAGIC_regdata && mg->mg_obj)
459 toLOWER(type), key, klen);
468 =for apidoc mg_localize
470 Copy some of the magic from an existing SV to new localized version of that
471 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
474 If setmagic is false then no set magic will be called on the new (empty) SV.
475 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
476 and that will handle the magic.
482 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
487 PERL_ARGS_ASSERT_MG_LOCALIZE;
492 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
493 const MGVTBL* const vtbl = mg->mg_virtual;
494 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
497 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
498 (void)vtbl->svt_local(aTHX_ nsv, mg);
500 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
501 mg->mg_ptr, mg->mg_len);
503 /* container types should remain read-only across localization */
504 if (!SvIsCOW(sv)) SvFLAGS(nsv) |= SvREADONLY(sv);
507 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
508 SvFLAGS(nsv) |= SvMAGICAL(sv);
517 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
519 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
521 const MGVTBL* const vtbl = mg->mg_virtual;
522 if (vtbl && vtbl->svt_free)
523 vtbl->svt_free(aTHX_ sv, mg);
524 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
525 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
526 Safefree(mg->mg_ptr);
527 else if (mg->mg_len == HEf_SVKEY)
528 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
530 if (mg->mg_flags & MGf_REFCOUNTED)
531 SvREFCNT_dec(mg->mg_obj);
538 Free any magic storage used by the SV. See C<sv_magic>.
544 Perl_mg_free(pTHX_ SV *sv)
549 PERL_ARGS_ASSERT_MG_FREE;
551 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
552 moremagic = mg->mg_moremagic;
553 mg_free_struct(sv, mg);
554 SvMAGIC_set(sv, moremagic);
556 SvMAGIC_set(sv, NULL);
562 =for apidoc Am|void|mg_free_type|SV *sv|int how
564 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
570 Perl_mg_free_type(pTHX_ SV *sv, int how)
572 MAGIC *mg, *prevmg, *moremg;
573 PERL_ARGS_ASSERT_MG_FREE_TYPE;
574 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
576 moremg = mg->mg_moremagic;
577 if (mg->mg_type == how) {
578 /* temporarily move to the head of the magic chain, in case
579 custom free code relies on this historical aspect of mg_free */
581 prevmg->mg_moremagic = moremg;
582 mg->mg_moremagic = SvMAGIC(sv);
585 newhead = mg->mg_moremagic;
586 mg_free_struct(sv, mg);
587 SvMAGIC_set(sv, newhead);
597 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
602 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
605 register const REGEXP * const rx = PM_GETRE(PL_curpm);
607 if (mg->mg_obj) { /* @+ */
608 /* return the number possible */
609 return RX_NPARENS(rx);
611 I32 paren = RX_LASTPAREN(rx);
613 /* return the last filled */
615 && (RX_OFFS(rx)[paren].start == -1
616 || RX_OFFS(rx)[paren].end == -1) )
627 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
631 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
634 register const REGEXP * const rx = PM_GETRE(PL_curpm);
636 register const I32 paren = mg->mg_len;
641 if (paren <= (I32)RX_NPARENS(rx) &&
642 (s = RX_OFFS(rx)[paren].start) != -1 &&
643 (t = RX_OFFS(rx)[paren].end) != -1)
646 if (mg->mg_obj) /* @+ */
651 if (i > 0 && RX_MATCH_UTF8(rx)) {
652 const char * const b = RX_SUBBEG(rx);
654 i = utf8_length((U8*)b, (U8*)(b+i));
665 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
667 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
670 Perl_croak_no_modify(aTHX);
671 NORETURN_FUNCTION_END;
675 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
680 register const REGEXP * rx;
681 const char * const remaining = mg->mg_ptr + 1;
683 PERL_ARGS_ASSERT_MAGIC_LEN;
685 switch (*mg->mg_ptr) {
687 if (*remaining == '\0') { /* ^P */
689 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
691 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
695 case '\015': /* $^MATCH */
696 if (strEQ(remaining, "ATCH")) {
703 paren = RX_BUFF_IDX_PREMATCH;
707 paren = RX_BUFF_IDX_POSTMATCH;
711 paren = RX_BUFF_IDX_FULLMATCH;
713 case '1': case '2': case '3': case '4':
714 case '5': case '6': case '7': case '8': case '9':
715 paren = atoi(mg->mg_ptr);
717 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
719 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
722 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
725 if (ckWARN(WARN_UNINITIALIZED))
730 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
731 paren = RX_LASTPAREN(rx);
736 case '\016': /* ^N */
737 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
738 paren = RX_LASTCLOSEPAREN(rx);
745 if (!SvPOK(sv) && SvNIOK(sv)) {
753 #define SvRTRIM(sv) STMT_START { \
755 STRLEN len = SvCUR(sv); \
756 char * const p = SvPVX(sv); \
757 while (len > 0 && isSPACE(p[len-1])) \
759 SvCUR_set(sv, len); \
765 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
767 PERL_ARGS_ASSERT_EMULATE_COP_IO;
769 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
770 sv_setsv(sv, &PL_sv_undef);
774 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
775 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
780 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
781 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
789 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
793 register const char *s = NULL;
795 const char * const remaining = mg->mg_ptr + 1;
796 const char nextchar = *remaining;
798 PERL_ARGS_ASSERT_MAGIC_GET;
800 switch (*mg->mg_ptr) {
801 case '\001': /* ^A */
802 sv_setsv(sv, PL_bodytarget);
803 if (SvTAINTED(PL_bodytarget))
806 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
807 if (nextchar == '\0') {
808 sv_setiv(sv, (IV)PL_minus_c);
810 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
811 sv_setiv(sv, (IV)STATUS_NATIVE);
815 case '\004': /* ^D */
816 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
818 case '\005': /* ^E */
819 if (nextchar == '\0') {
822 # include <descrip.h>
823 # include <starlet.h>
825 $DESCRIPTOR(msgdsc,msg);
826 sv_setnv(sv,(NV) vaxc$errno);
827 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
828 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
833 if (!(_emx_env & 0x200)) { /* Under DOS */
834 sv_setnv(sv, (NV)errno);
835 sv_setpv(sv, errno ? Strerror(errno) : "");
837 if (errno != errno_isOS2) {
838 const int tmp = _syserrno();
839 if (tmp) /* 2nd call to _syserrno() makes it 0 */
842 sv_setnv(sv, (NV)Perl_rc);
843 sv_setpv(sv, os2error(Perl_rc));
847 const DWORD dwErr = GetLastError();
848 sv_setnv(sv, (NV)dwErr);
850 PerlProc_GetOSError(sv, dwErr);
859 sv_setnv(sv, (NV)errno);
860 sv_setpv(sv, errno ? Strerror(errno) : "");
865 SvNOK_on(sv); /* what a wonderful hack! */
867 else if (strEQ(remaining, "NCODING"))
868 sv_setsv(sv, PL_encoding);
870 case '\006': /* ^F */
871 sv_setiv(sv, (IV)PL_maxsysfd);
873 case '\007': /* ^GLOBAL_PHASE */
874 if (strEQ(remaining, "LOBAL_PHASE")) {
875 sv_setpvn(sv, PL_phase_names[PL_phase],
876 strlen(PL_phase_names[PL_phase]));
879 case '\010': /* ^H */
880 sv_setiv(sv, (IV)PL_hints);
882 case '\011': /* ^I */ /* NOT \t in EBCDIC */
883 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
885 case '\017': /* ^O & ^OPEN */
886 if (nextchar == '\0') {
887 sv_setpv(sv, PL_osname);
890 else if (strEQ(remaining, "PEN")) {
891 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
895 if (nextchar == '\0') { /* ^P */
896 sv_setiv(sv, (IV)PL_perldb);
897 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
898 goto do_prematch_fetch;
899 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
900 goto do_postmatch_fetch;
903 case '\023': /* ^S */
904 if (nextchar == '\0') {
905 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
908 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
913 case '\024': /* ^T */
914 if (nextchar == '\0') {
916 sv_setnv(sv, PL_basetime);
918 sv_setiv(sv, (IV)PL_basetime);
921 else if (strEQ(remaining, "AINT"))
922 sv_setiv(sv, PL_tainting
923 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
926 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
927 if (strEQ(remaining, "NICODE"))
928 sv_setuv(sv, (UV) PL_unicode);
929 else if (strEQ(remaining, "TF8LOCALE"))
930 sv_setuv(sv, (UV) PL_utf8locale);
931 else if (strEQ(remaining, "TF8CACHE"))
932 sv_setiv(sv, (IV) PL_utf8cache);
934 case '\027': /* ^W & $^WARNING_BITS */
935 if (nextchar == '\0')
936 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
937 else if (strEQ(remaining, "ARNING_BITS")) {
938 if (PL_compiling.cop_warnings == pWARN_NONE) {
939 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
941 else if (PL_compiling.cop_warnings == pWARN_STD) {
944 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
948 else if (PL_compiling.cop_warnings == pWARN_ALL) {
949 /* Get the bit mask for $warnings::Bits{all}, because
950 * it could have been extended by warnings::register */
951 HV * const bits=get_hv("warnings::Bits", 0);
953 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
955 sv_setsv(sv, *bits_all);
958 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
962 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
963 *PL_compiling.cop_warnings);
968 case '\015': /* $^MATCH */
969 if (strEQ(remaining, "ATCH")) {
970 case '1': case '2': case '3': case '4':
971 case '5': case '6': case '7': case '8': case '9': case '&':
972 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
974 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
975 * XXX Does the new way break anything?
977 paren = atoi(mg->mg_ptr); /* $& is in [0] */
978 CALLREG_NUMBUF_FETCH(rx,paren,sv);
981 sv_setsv(sv,&PL_sv_undef);
985 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
986 if (RX_LASTPAREN(rx)) {
987 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
991 sv_setsv(sv,&PL_sv_undef);
993 case '\016': /* ^N */
994 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
995 if (RX_LASTCLOSEPAREN(rx)) {
996 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
1001 sv_setsv(sv,&PL_sv_undef);
1005 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1006 CALLREG_NUMBUF_FETCH(rx,-2,sv);
1009 sv_setsv(sv,&PL_sv_undef);
1013 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1014 CALLREG_NUMBUF_FETCH(rx,-1,sv);
1017 sv_setsv(sv,&PL_sv_undef);
1020 if (GvIO(PL_last_in_gv)) {
1021 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1026 sv_setiv(sv, (IV)STATUS_CURRENT);
1027 #ifdef COMPLEX_STATUS
1028 SvUPGRADE(sv, SVt_PVLV);
1029 LvTARGOFF(sv) = PL_statusvalue;
1030 LvTARGLEN(sv) = PL_statusvalue_vms;
1035 if (GvIOp(PL_defoutgv))
1036 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1040 sv_setpv(sv,GvENAME(PL_defoutgv));
1041 sv_catpvs(sv,"_TOP");
1045 if (GvIOp(PL_defoutgv))
1046 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1048 s = GvENAME(PL_defoutgv);
1052 if (GvIO(PL_defoutgv))
1053 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1056 if (GvIO(PL_defoutgv))
1057 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1060 if (GvIO(PL_defoutgv))
1061 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1071 if (GvIO(PL_defoutgv))
1072 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1076 sv_copypv(sv, PL_ors_sv);
1080 IV const pid = (IV)PerlProc_getpid();
1081 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid)
1082 /* never set manually, or at least not since last fork */
1084 /* else a value has been assigned manually, so do nothing */
1092 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1094 sv_setnv(sv, (NV)errno);
1097 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1098 sv_setpv(sv, os2error(Perl_rc));
1101 sv_setpv(sv, errno ? Strerror(errno) : "");
1103 SvPOK_on(sv); /* may have got removed during taint processing */
1108 SvNOK_on(sv); /* what a wonderful hack! */
1111 sv_setiv(sv, (IV)PL_uid);
1114 sv_setiv(sv, (IV)PL_euid);
1117 sv_setiv(sv, (IV)PL_gid);
1120 sv_setiv(sv, (IV)PL_egid);
1122 #ifdef HAS_GETGROUPS
1124 Groups_t *gary = NULL;
1125 I32 i, num_groups = getgroups(0, gary);
1126 Newx(gary, num_groups, Groups_t);
1127 num_groups = getgroups(num_groups, gary);
1128 for (i = 0; i < num_groups; i++)
1129 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1132 (void)SvIOK_on(sv); /* what a wonderful hack! */
1142 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1144 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1146 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1148 if (uf && uf->uf_val)
1149 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1154 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1157 STRLEN len = 0, klen;
1158 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1159 const char * const ptr = MgPV_const(mg,klen);
1162 PERL_ARGS_ASSERT_MAGIC_SETENV;
1164 #ifdef DYNAMIC_ENV_FETCH
1165 /* We just undefd an environment var. Is a replacement */
1166 /* waiting in the wings? */
1168 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1170 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1174 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1175 /* And you'll never guess what the dog had */
1176 /* in its mouth... */
1178 MgTAINTEDDIR_off(mg);
1180 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1181 char pathbuf[256], eltbuf[256], *cp, *elt;
1184 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1186 do { /* DCL$PATH may be a search list */
1187 while (1) { /* as may dev portion of any element */
1188 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1189 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1190 cando_by_name(S_IWUSR,0,elt) ) {
1191 MgTAINTEDDIR_on(mg);
1195 if ((cp = strchr(elt, ':')) != NULL)
1197 if (my_trnlnm(elt, eltbuf, j++))
1203 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1206 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1207 const char * const strend = s + len;
1209 while (s < strend) {
1213 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1214 const char path_sep = '|';
1216 const char path_sep = ':';
1218 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1219 s, strend, path_sep, &i);
1221 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1223 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1225 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1227 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1228 MgTAINTEDDIR_on(mg);
1234 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1240 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1242 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1243 PERL_UNUSED_ARG(sv);
1244 my_setenv(MgPV_nolen_const(mg),NULL);
1249 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1252 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1253 PERL_UNUSED_ARG(mg);
1255 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1257 if (PL_localizing) {
1260 hv_iterinit(MUTABLE_HV(sv));
1261 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1263 my_setenv(hv_iterkey(entry, &keylen),
1264 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1272 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1275 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1276 PERL_UNUSED_ARG(sv);
1277 PERL_UNUSED_ARG(mg);
1279 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1287 #ifdef HAS_SIGPROCMASK
1289 restore_sigmask(pTHX_ SV *save_sv)
1291 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1292 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1296 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1299 /* Are we fetching a signal entry? */
1300 int i = (I16)mg->mg_private;
1302 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1305 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1310 sv_setsv(sv,PL_psig_ptr[i]);
1312 Sighandler_t sigstate = rsignal_state(i);
1313 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1314 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1317 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1318 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1321 /* cache state so we don't fetch it again */
1322 if(sigstate == (Sighandler_t) SIG_IGN)
1323 sv_setpvs(sv,"IGNORE");
1325 sv_setsv(sv,&PL_sv_undef);
1326 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1333 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1335 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1337 magic_setsig(NULL, mg);
1338 return sv_unmagic(sv, mg->mg_type);
1342 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1343 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1345 Perl_csighandler(int sig)
1348 #ifdef PERL_GET_SIG_CONTEXT
1349 dTHXa(PERL_GET_SIG_CONTEXT);
1353 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1354 (void) rsignal(sig, PL_csighandlerp);
1355 if (PL_sig_ignoring[sig]) return;
1357 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1358 if (PL_sig_defaulting[sig])
1359 #ifdef KILL_BY_SIGPRC
1360 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1375 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1376 /* Call the perl level handler now--
1377 * with risk we may be in malloc() or being destructed etc. */
1378 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1379 (*PL_sighandlerp)(sig, NULL, NULL);
1381 (*PL_sighandlerp)(sig);
1384 if (!PL_psig_pend) return;
1385 /* Set a flag to say this signal is pending, that is awaiting delivery after
1386 * the current Perl opcode completes */
1387 PL_psig_pend[sig]++;
1389 #ifndef SIG_PENDING_DIE_COUNT
1390 # define SIG_PENDING_DIE_COUNT 120
1392 /* Add one to say _a_ signal is pending */
1393 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1394 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1395 (unsigned long)SIG_PENDING_DIE_COUNT);
1399 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1401 Perl_csighandler_init(void)
1404 if (PL_sig_handlers_initted) return;
1406 for (sig = 1; sig < SIG_SIZE; sig++) {
1407 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1409 PL_sig_defaulting[sig] = 1;
1410 (void) rsignal(sig, PL_csighandlerp);
1412 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1413 PL_sig_ignoring[sig] = 0;
1416 PL_sig_handlers_initted = 1;
1420 #if defined HAS_SIGPROCMASK
1422 unblock_sigmask(pTHX_ void* newset)
1424 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1429 Perl_despatch_signals(pTHX)
1434 for (sig = 1; sig < SIG_SIZE; sig++) {
1435 if (PL_psig_pend[sig]) {
1437 #ifdef HAS_SIGPROCMASK
1438 /* From sigaction(2) (FreeBSD man page):
1439 * | Signal routines normally execute with the signal that
1440 * | caused their invocation blocked, but other signals may
1442 * Emulation of this behavior (from within Perl) is enabled
1446 sigset_t newset, oldset;
1448 sigemptyset(&newset);
1449 sigaddset(&newset, sig);
1450 sigprocmask(SIG_BLOCK, &newset, &oldset);
1451 was_blocked = sigismember(&oldset, sig);
1453 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1455 SAVEFREESV(save_sv);
1456 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1459 PL_psig_pend[sig] = 0;
1460 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1461 (*PL_sighandlerp)(sig, NULL, NULL);
1463 (*PL_sighandlerp)(sig);
1465 #ifdef HAS_SIGPROCMASK
1474 /* sv of NULL signifies that we're acting as magic_clearsig. */
1476 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1481 /* Need to be careful with SvREFCNT_dec(), because that can have side
1482 * effects (due to closures). We must make sure that the new disposition
1483 * is in place before it is called.
1487 #ifdef HAS_SIGPROCMASK
1491 register const char *s = MgPV_const(mg,len);
1493 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1496 if (strEQ(s,"__DIE__"))
1498 else if (strEQ(s,"__WARN__")
1499 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1500 /* Merge the existing behaviours, which are as follows:
1501 magic_setsig, we always set svp to &PL_warnhook
1502 (hence we always change the warnings handler)
1503 For magic_clearsig, we don't change the warnings handler if it's
1504 set to the &PL_warnhook. */
1507 Perl_croak(aTHX_ "No such hook: %s", s);
1510 if (*svp != PERL_WARNHOOK_FATAL)
1516 i = (I16)mg->mg_private;
1518 i = whichsig(s); /* ...no, a brick */
1519 mg->mg_private = (U16)i;
1523 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1526 #ifdef HAS_SIGPROCMASK
1527 /* Avoid having the signal arrive at a bad time, if possible. */
1530 sigprocmask(SIG_BLOCK, &set, &save);
1532 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1533 SAVEFREESV(save_sv);
1534 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1537 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1538 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1540 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1541 PL_sig_ignoring[i] = 0;
1543 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1544 PL_sig_defaulting[i] = 0;
1546 to_dec = PL_psig_ptr[i];
1548 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1549 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1551 /* Signals don't change name during the program's execution, so once
1552 they're cached in the appropriate slot of PL_psig_name, they can
1555 Ideally we'd find some way of making SVs at (C) compile time, or
1556 at least, doing most of the work. */
1557 if (!PL_psig_name[i]) {
1558 PL_psig_name[i] = newSVpvn(s, len);
1559 SvREADONLY_on(PL_psig_name[i]);
1562 SvREFCNT_dec(PL_psig_name[i]);
1563 PL_psig_name[i] = NULL;
1564 PL_psig_ptr[i] = NULL;
1567 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1569 (void)rsignal(i, PL_csighandlerp);
1572 *svp = SvREFCNT_inc_simple_NN(sv);
1574 if (sv && SvOK(sv)) {
1575 s = SvPV_force(sv, len);
1579 if (sv && strEQ(s,"IGNORE")) {
1581 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1582 PL_sig_ignoring[i] = 1;
1583 (void)rsignal(i, PL_csighandlerp);
1585 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1589 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1591 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1592 PL_sig_defaulting[i] = 1;
1593 (void)rsignal(i, PL_csighandlerp);
1595 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1601 * We should warn if HINT_STRICT_REFS, but without
1602 * access to a known hint bit in a known OP, we can't
1603 * tell whether HINT_STRICT_REFS is in force or not.
1605 if (!strchr(s,':') && !strchr(s,'\''))
1606 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1609 (void)rsignal(i, PL_csighandlerp);
1611 *svp = SvREFCNT_inc_simple_NN(sv);
1615 #ifdef HAS_SIGPROCMASK
1619 SvREFCNT_dec(to_dec);
1622 #endif /* !PERL_MICRO */
1625 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1628 PERL_ARGS_ASSERT_MAGIC_SETISA;
1629 PERL_UNUSED_ARG(sv);
1631 /* Skip _isaelem because _isa will handle it shortly */
1632 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1635 return magic_clearisa(NULL, mg);
1638 /* sv of NULL signifies that we're acting as magic_setisa. */
1640 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1645 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1647 /* Bail out if destruction is going on */
1648 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1651 av_clear(MUTABLE_AV(sv));
1653 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1654 /* This occurs with setisa_elem magic, which calls this
1656 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1658 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1659 SV **svp = AvARRAY((AV *)mg->mg_obj);
1660 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1662 stash = GvSTASH((GV *)*svp++);
1663 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1670 (const GV *)mg->mg_obj
1673 /* The stash may have been detached from the symbol table, so check its
1674 name before doing anything. */
1675 if (stash && HvENAME_get(stash))
1676 mro_isa_changed_in(stash);
1682 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1685 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1686 PERL_UNUSED_ARG(sv);
1687 PERL_UNUSED_ARG(mg);
1688 PL_amagic_generation++;
1694 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1696 HV * const hv = MUTABLE_HV(LvTARG(sv));
1699 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1700 PERL_UNUSED_ARG(mg);
1703 (void) hv_iterinit(hv);
1704 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1707 while (hv_iternext(hv))
1712 sv_setiv(sv, (IV)i);
1717 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1719 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1720 PERL_UNUSED_ARG(mg);
1722 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1728 =for apidoc magic_methcall
1730 Invoke a magic method (like FETCH).
1732 C<sv> and C<mg> are the tied thingy and the tie magic.
1734 C<meth> is the name of the method to call.
1736 C<argc> is the number of args (in addition to $self) to pass to the method.
1738 The C<flags> can be:
1740 G_DISCARD invoke method with G_DISCARD flag and don't
1742 G_UNDEF_FILL fill the stack with argc pointers to
1745 The arguments themselves are any values following the C<flags> argument.
1747 Returns the SV (if any) returned by the method, or NULL on failure.
1754 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1761 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1765 if (flags & G_WRITING_TO_STDERR) {
1769 SAVESPTR(PL_stderrgv);
1773 PUSHSTACKi(PERLSI_MAGIC);
1777 PUSHs(SvTIED_obj(sv, mg));
1778 if (flags & G_UNDEF_FILL) {
1780 PUSHs(&PL_sv_undef);
1782 } else if (argc > 0) {
1784 va_start(args, argc);
1787 SV *const sv = va_arg(args, SV *);
1794 if (flags & G_DISCARD) {
1795 call_method(meth, G_SCALAR|G_DISCARD);
1798 if (call_method(meth, G_SCALAR))
1799 ret = *PL_stack_sp--;
1802 if (flags & G_WRITING_TO_STDERR)
1809 /* wrapper for magic_methcall that creates the first arg */
1812 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1818 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1821 if (mg->mg_len >= 0) {
1822 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1824 else if (mg->mg_len == HEf_SVKEY)
1825 arg1 = MUTABLE_SV(mg->mg_ptr);
1827 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1828 arg1 = newSViv((IV)(mg->mg_len));
1832 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1834 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1838 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1843 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1845 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1852 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1854 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1856 if (mg->mg_type == PERL_MAGIC_tiedelem)
1857 mg->mg_flags |= MGf_GSKIP;
1858 magic_methpack(sv,mg,"FETCH");
1863 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1869 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1871 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1872 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1873 * public flags indicate its value based on copying from $val. Doing
1874 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1875 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1876 * wrong if $val happened to be tainted, as sv hasn't got magic
1877 * enabled, even though taint magic is in the chain. In which case,
1878 * fake up a temporary tainted value (this is easier than temporarily
1879 * re-enabling magic on sv). */
1881 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1882 && (tmg->mg_len & 1))
1884 val = sv_mortalcopy(sv);
1890 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1895 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1897 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1899 return magic_methpack(sv,mg,"DELETE");
1904 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1910 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1912 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1914 retval = SvIV(retsv)-1;
1916 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1918 return (U32) retval;
1922 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1926 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1928 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1933 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1938 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1940 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1941 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1948 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1950 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1952 return magic_methpack(sv,mg,"EXISTS");
1956 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1960 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1961 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1963 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1965 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1967 if (HvEITER_get(hv))
1968 /* we are in an iteration so the hash cannot be empty */
1970 /* no xhv_eiter so now use FIRSTKEY */
1971 key = sv_newmortal();
1972 magic_nextpack(MUTABLE_SV(hv), mg, key);
1973 HvEITER_set(hv, NULL); /* need to reset iterator */
1974 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1977 /* there is a SCALAR method that we can call */
1978 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
1980 retval = &PL_sv_undef;
1985 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1988 GV * const gv = PL_DBline;
1989 const I32 i = SvTRUE(sv);
1990 SV ** const svp = av_fetch(GvAV(gv),
1991 atoi(MgPV_nolen_const(mg)), FALSE);
1993 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1995 if (svp && SvIOKp(*svp)) {
1996 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1998 /* set or clear breakpoint in the relevant control op */
2000 o->op_flags |= OPf_SPECIAL;
2002 o->op_flags &= ~OPf_SPECIAL;
2009 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2012 AV * const obj = MUTABLE_AV(mg->mg_obj);
2014 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2017 sv_setiv(sv, AvFILL(obj));
2025 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2028 AV * const obj = MUTABLE_AV(mg->mg_obj);
2030 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2033 av_fill(obj, SvIV(sv));
2035 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2036 "Attempt to set length of freed array");
2042 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2046 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2047 PERL_UNUSED_ARG(sv);
2049 /* during global destruction, mg_obj may already have been freed */
2050 if (PL_in_clean_all)
2053 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2056 /* arylen scalar holds a pointer back to the array, but doesn't own a
2057 reference. Hence the we (the array) are about to go away with it
2058 still pointing at us. Clear its pointer, else it would be pointing
2059 at free memory. See the comment in sv_magic about reference loops,
2060 and why it can't own a reference to us. */
2067 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2070 SV* const lsv = LvTARG(sv);
2072 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2073 PERL_UNUSED_ARG(mg);
2075 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2076 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2077 if (found && found->mg_len >= 0) {
2078 I32 i = found->mg_len;
2080 sv_pos_b2u(lsv, &i);
2090 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2093 SV* const lsv = LvTARG(sv);
2099 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2100 PERL_UNUSED_ARG(mg);
2102 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2103 found = mg_find(lsv, PERL_MAGIC_regex_global);
2109 #ifdef PERL_OLD_COPY_ON_WRITE
2111 sv_force_normal_flags(lsv, 0);
2113 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2116 else if (!SvOK(sv)) {
2120 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2125 ulen = sv_len_utf8(lsv);
2135 else if (pos > (SSize_t)len)
2140 sv_pos_u2b(lsv, &p, 0);
2144 found->mg_len = pos;
2145 found->mg_flags &= ~MGf_MINMATCH;
2151 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2154 SV * const lsv = LvTARG(sv);
2155 const char * const tmps = SvPV_const(lsv,len);
2156 STRLEN offs = LvTARGOFF(sv);
2157 STRLEN rem = LvTARGLEN(sv);
2159 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2160 PERL_UNUSED_ARG(mg);
2163 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
2166 if (rem > len - offs)
2168 sv_setpvn(sv, tmps + offs, rem);
2175 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2179 const char * const tmps = SvPV_const(sv, len);
2180 SV * const lsv = LvTARG(sv);
2181 STRLEN lvoff = LvTARGOFF(sv);
2182 STRLEN lvlen = LvTARGLEN(sv);
2184 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2185 PERL_UNUSED_ARG(mg);
2188 sv_utf8_upgrade(lsv);
2189 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2190 sv_insert(lsv, lvoff, lvlen, tmps, len);
2191 LvTARGLEN(sv) = sv_len_utf8(sv);
2194 else if (lsv && SvUTF8(lsv)) {
2196 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2197 LvTARGLEN(sv) = len;
2198 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2199 sv_insert(lsv, lvoff, lvlen, utf8, len);
2203 sv_insert(lsv, lvoff, lvlen, tmps, len);
2204 LvTARGLEN(sv) = len;
2211 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2215 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2216 PERL_UNUSED_ARG(sv);
2218 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2223 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2227 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2228 PERL_UNUSED_ARG(sv);
2230 /* update taint status */
2239 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2241 SV * const lsv = LvTARG(sv);
2243 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2244 PERL_UNUSED_ARG(mg);
2247 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2255 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2257 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2258 PERL_UNUSED_ARG(mg);
2259 do_vecset(sv); /* XXX slurp this routine */
2264 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2269 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2271 if (LvTARGLEN(sv)) {
2273 SV * const ahv = LvTARG(sv);
2274 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2279 AV *const av = MUTABLE_AV(LvTARG(sv));
2280 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2281 targ = AvARRAY(av)[LvTARGOFF(sv)];
2283 if (targ && (targ != &PL_sv_undef)) {
2284 /* somebody else defined it for us */
2285 SvREFCNT_dec(LvTARG(sv));
2286 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2288 SvREFCNT_dec(mg->mg_obj);
2290 mg->mg_flags &= ~MGf_REFCOUNTED;
2295 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2300 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2302 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2303 PERL_UNUSED_ARG(mg);
2307 sv_setsv(LvTARG(sv), sv);
2308 SvSETMAGIC(LvTARG(sv));
2314 Perl_vivify_defelem(pTHX_ SV *sv)
2320 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2322 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2325 SV * const ahv = LvTARG(sv);
2326 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2329 if (!value || value == &PL_sv_undef)
2330 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2333 AV *const av = MUTABLE_AV(LvTARG(sv));
2334 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2335 LvTARG(sv) = NULL; /* array can't be extended */
2337 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2338 if (!svp || (value = *svp) == &PL_sv_undef)
2339 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2342 SvREFCNT_inc_simple_void(value);
2343 SvREFCNT_dec(LvTARG(sv));
2346 SvREFCNT_dec(mg->mg_obj);
2348 mg->mg_flags &= ~MGf_REFCOUNTED;
2352 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2354 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2355 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2360 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2362 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2363 PERL_UNUSED_CONTEXT;
2364 PERL_UNUSED_ARG(sv);
2370 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2372 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2374 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2376 if (uf && uf->uf_set)
2377 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2382 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2384 const char type = mg->mg_type;
2386 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2388 if (type == PERL_MAGIC_qr) {
2389 } else if (type == PERL_MAGIC_bm) {
2392 } else if (type == PERL_MAGIC_study) {
2393 if (!isGV_with_GP(sv))
2396 assert(type == PERL_MAGIC_fm);
2398 return sv_unmagic(sv, type);
2401 #ifdef USE_LOCALE_COLLATE
2403 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2405 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2408 * RenE<eacute> Descartes said "I think not."
2409 * and vanished with a faint plop.
2411 PERL_UNUSED_CONTEXT;
2412 PERL_UNUSED_ARG(sv);
2414 Safefree(mg->mg_ptr);
2420 #endif /* USE_LOCALE_COLLATE */
2422 /* Just clear the UTF-8 cache data. */
2424 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2426 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2427 PERL_UNUSED_CONTEXT;
2428 PERL_UNUSED_ARG(sv);
2429 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2431 mg->mg_len = -1; /* The mg_len holds the len cache. */
2436 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2439 register const char *s;
2441 register const REGEXP * rx;
2442 const char * const remaining = mg->mg_ptr + 1;
2447 PERL_ARGS_ASSERT_MAGIC_SET;
2449 switch (*mg->mg_ptr) {
2450 case '\015': /* $^MATCH */
2451 if (strEQ(remaining, "ATCH"))
2453 case '`': /* ${^PREMATCH} caught below */
2455 paren = RX_BUFF_IDX_PREMATCH;
2457 case '\'': /* ${^POSTMATCH} caught below */
2459 paren = RX_BUFF_IDX_POSTMATCH;
2463 paren = RX_BUFF_IDX_FULLMATCH;
2465 case '1': case '2': case '3': case '4':
2466 case '5': case '6': case '7': case '8': case '9':
2467 paren = atoi(mg->mg_ptr);
2469 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2470 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2472 /* Croak with a READONLY error when a numbered match var is
2473 * set without a previous pattern match. Unless it's C<local $1>
2475 if (!PL_localizing) {
2476 Perl_croak_no_modify(aTHX);
2480 case '\001': /* ^A */
2481 sv_setsv(PL_bodytarget, sv);
2482 FmLINES(PL_bodytarget) = 0;
2483 if (SvPOK(PL_bodytarget)) {
2484 char *s = SvPVX(PL_bodytarget);
2485 while ( ((s = strchr(s, '\n'))) ) {
2486 FmLINES(PL_bodytarget)++;
2490 /* mg_set() has temporarily made sv non-magical */
2492 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2493 SvTAINTED_on(PL_bodytarget);
2495 SvTAINTED_off(PL_bodytarget);
2498 case '\003': /* ^C */
2499 PL_minus_c = cBOOL(SvIV(sv));
2502 case '\004': /* ^D */
2504 s = SvPV_nolen_const(sv);
2505 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2506 if (DEBUG_x_TEST || DEBUG_B_TEST)
2507 dump_all_perl(!DEBUG_B_TEST);
2509 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2512 case '\005': /* ^E */
2513 if (*(mg->mg_ptr+1) == '\0') {
2515 set_vaxc_errno(SvIV(sv));
2518 SetLastError( SvIV(sv) );
2521 os2_setsyserrno(SvIV(sv));
2523 /* will anyone ever use this? */
2524 SETERRNO(SvIV(sv), 4);
2529 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2530 SvREFCNT_dec(PL_encoding);
2531 if (SvOK(sv) || SvGMAGICAL(sv)) {
2532 PL_encoding = newSVsv(sv);
2539 case '\006': /* ^F */
2540 PL_maxsysfd = SvIV(sv);
2542 case '\010': /* ^H */
2543 PL_hints = SvIV(sv);
2545 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2546 Safefree(PL_inplace);
2547 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2549 case '\017': /* ^O */
2550 if (*(mg->mg_ptr+1) == '\0') {
2551 Safefree(PL_osname);
2554 TAINT_PROPER("assigning to $^O");
2555 PL_osname = savesvpv(sv);
2558 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2560 const char *const start = SvPV(sv, len);
2561 const char *out = (const char*)memchr(start, '\0', len);
2565 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2566 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2568 /* Opening for input is more common than opening for output, so
2569 ensure that hints for input are sooner on linked list. */
2570 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2572 : newSVpvs_flags("", SvUTF8(sv));
2573 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2576 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2578 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2582 case '\020': /* ^P */
2583 if (*remaining == '\0') { /* ^P */
2584 PL_perldb = SvIV(sv);
2585 if (PL_perldb && !PL_DBsingle)
2588 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2590 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2594 case '\024': /* ^T */
2596 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2598 PL_basetime = (Time_t)SvIV(sv);
2601 case '\025': /* ^UTF8CACHE */
2602 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2603 PL_utf8cache = (signed char) sv_2iv(sv);
2606 case '\027': /* ^W & $^WARNING_BITS */
2607 if (*(mg->mg_ptr+1) == '\0') {
2608 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2610 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2611 | (i ? G_WARN_ON : G_WARN_OFF) ;
2614 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2615 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2616 if (!SvPOK(sv) && PL_localizing) {
2617 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2618 PL_compiling.cop_warnings = pWARN_NONE;
2623 int accumulate = 0 ;
2624 int any_fatals = 0 ;
2625 const char * const ptr = SvPV_const(sv, len) ;
2626 for (i = 0 ; i < len ; ++i) {
2627 accumulate |= ptr[i] ;
2628 any_fatals |= (ptr[i] & 0xAA) ;
2631 if (!specialWARN(PL_compiling.cop_warnings))
2632 PerlMemShared_free(PL_compiling.cop_warnings);
2633 PL_compiling.cop_warnings = pWARN_NONE;
2635 /* Yuck. I can't see how to abstract this: */
2636 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2637 WARN_ALL) && !any_fatals) {
2638 if (!specialWARN(PL_compiling.cop_warnings))
2639 PerlMemShared_free(PL_compiling.cop_warnings);
2640 PL_compiling.cop_warnings = pWARN_ALL;
2641 PL_dowarn |= G_WARN_ONCE ;
2645 const char *const p = SvPV_const(sv, len);
2647 PL_compiling.cop_warnings
2648 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2651 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2652 PL_dowarn |= G_WARN_ONCE ;
2660 if (PL_localizing) {
2661 if (PL_localizing == 1)
2662 SAVESPTR(PL_last_in_gv);
2664 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2665 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2668 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2669 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2670 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2673 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2674 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2675 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2678 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2681 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2682 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2683 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2686 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2690 IO * const io = GvIO(PL_defoutgv);
2693 if ((SvIV(sv)) == 0)
2694 IoFLAGS(io) &= ~IOf_FLUSH;
2696 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2697 PerlIO *ofp = IoOFP(io);
2699 (void)PerlIO_flush(ofp);
2700 IoFLAGS(io) |= IOf_FLUSH;
2706 SvREFCNT_dec(PL_rs);
2707 PL_rs = newSVsv(sv);
2710 SvREFCNT_dec(PL_ors_sv);
2711 if (SvOK(sv) || SvGMAGICAL(sv)) {
2712 PL_ors_sv = newSVsv(sv);
2720 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2723 #ifdef COMPLEX_STATUS
2724 if (PL_localizing == 2) {
2725 SvUPGRADE(sv, SVt_PVLV);
2726 PL_statusvalue = LvTARGOFF(sv);
2727 PL_statusvalue_vms = LvTARGLEN(sv);
2731 #ifdef VMSISH_STATUS
2733 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2736 STATUS_UNIX_EXIT_SET(SvIV(sv));
2741 # define PERL_VMS_BANG vaxc$errno
2743 # define PERL_VMS_BANG 0
2745 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2746 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2751 if (PL_delaymagic) {
2752 PL_delaymagic |= DM_RUID;
2753 break; /* don't do magic till later */
2756 (void)setruid((Uid_t)PL_uid);
2759 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2761 #ifdef HAS_SETRESUID
2762 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2764 if (PL_uid == PL_euid) { /* special case $< = $> */
2766 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2767 if (PL_uid != 0 && PerlProc_getuid() == 0)
2768 (void)PerlProc_setuid(0);
2770 (void)PerlProc_setuid(PL_uid);
2772 PL_uid = PerlProc_getuid();
2773 Perl_croak(aTHX_ "setruid() not implemented");
2778 PL_uid = PerlProc_getuid();
2782 if (PL_delaymagic) {
2783 PL_delaymagic |= DM_EUID;
2784 break; /* don't do magic till later */
2787 (void)seteuid((Uid_t)PL_euid);
2790 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2792 #ifdef HAS_SETRESUID
2793 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2795 if (PL_euid == PL_uid) /* special case $> = $< */
2796 PerlProc_setuid(PL_euid);
2798 PL_euid = PerlProc_geteuid();
2799 Perl_croak(aTHX_ "seteuid() not implemented");
2804 PL_euid = PerlProc_geteuid();
2808 if (PL_delaymagic) {
2809 PL_delaymagic |= DM_RGID;
2810 break; /* don't do magic till later */
2813 (void)setrgid((Gid_t)PL_gid);
2816 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2818 #ifdef HAS_SETRESGID
2819 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2821 if (PL_gid == PL_egid) /* special case $( = $) */
2822 (void)PerlProc_setgid(PL_gid);
2824 PL_gid = PerlProc_getgid();
2825 Perl_croak(aTHX_ "setrgid() not implemented");
2830 PL_gid = PerlProc_getgid();
2833 #ifdef HAS_SETGROUPS
2835 const char *p = SvPV_const(sv, len);
2836 Groups_t *gary = NULL;
2837 #ifdef _SC_NGROUPS_MAX
2838 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2843 int maxgrp = NGROUPS;
2849 for (i = 0; i < maxgrp; ++i) {
2850 while (*p && !isSPACE(*p))
2857 Newx(gary, i + 1, Groups_t);
2859 Renew(gary, i + 1, Groups_t);
2863 (void)setgroups(i, gary);
2866 #else /* HAS_SETGROUPS */
2868 #endif /* HAS_SETGROUPS */
2869 if (PL_delaymagic) {
2870 PL_delaymagic |= DM_EGID;
2871 break; /* don't do magic till later */
2874 (void)setegid((Gid_t)PL_egid);
2877 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2879 #ifdef HAS_SETRESGID
2880 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2882 if (PL_egid == PL_gid) /* special case $) = $( */
2883 (void)PerlProc_setgid(PL_egid);
2885 PL_egid = PerlProc_getegid();
2886 Perl_croak(aTHX_ "setegid() not implemented");
2891 PL_egid = PerlProc_getegid();
2894 PL_chopset = SvPV_force(sv,len);
2897 /* Store the pid in mg->mg_obj so we can tell when a fork has
2898 occurred. mg->mg_obj points to *$ by default, so clear it. */
2899 if (isGV(mg->mg_obj)) {
2900 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2901 SvREFCNT_dec(mg->mg_obj);
2902 mg->mg_flags |= MGf_REFCOUNTED;
2903 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2905 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2908 LOCK_DOLLARZERO_MUTEX;
2909 #ifdef HAS_SETPROCTITLE
2910 /* The BSDs don't show the argv[] in ps(1) output, they
2911 * show a string from the process struct and provide
2912 * the setproctitle() routine to manipulate that. */
2913 if (PL_origalen != 1) {
2914 s = SvPV_const(sv, len);
2915 # if __FreeBSD_version > 410001
2916 /* The leading "-" removes the "perl: " prefix,
2917 * but not the "(perl) suffix from the ps(1)
2918 * output, because that's what ps(1) shows if the
2919 * argv[] is modified. */
2920 setproctitle("-%s", s);
2921 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2922 /* This doesn't really work if you assume that
2923 * $0 = 'foobar'; will wipe out 'perl' from the $0
2924 * because in ps(1) output the result will be like
2925 * sprintf("perl: %s (perl)", s)
2926 * I guess this is a security feature:
2927 * one (a user process) cannot get rid of the original name.
2929 setproctitle("%s", s);
2932 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2933 if (PL_origalen != 1) {
2935 s = SvPV_const(sv, len);
2936 un.pst_command = (char *)s;
2937 pstat(PSTAT_SETCMD, un, len, 0, 0);
2940 if (PL_origalen > 1) {
2941 /* PL_origalen is set in perl_parse(). */
2942 s = SvPV_force(sv,len);
2943 if (len >= (STRLEN)PL_origalen-1) {
2944 /* Longer than original, will be truncated. We assume that
2945 * PL_origalen bytes are available. */
2946 Copy(s, PL_origargv[0], PL_origalen-1, char);
2949 /* Shorter than original, will be padded. */
2951 /* Special case for Mac OS X: see [perl #38868] */
2954 /* Is the space counterintuitive? Yes.
2955 * (You were expecting \0?)
2956 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2958 const int pad = ' ';
2960 Copy(s, PL_origargv[0], len, char);
2961 PL_origargv[0][len] = 0;
2962 memset(PL_origargv[0] + len + 1,
2963 pad, PL_origalen - len - 1);
2965 PL_origargv[0][PL_origalen-1] = 0;
2966 for (i = 1; i < PL_origargc; i++)
2968 #ifdef HAS_PRCTL_SET_NAME
2969 /* Set the legacy process name in addition to the POSIX name on Linux */
2970 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2971 /* diag_listed_as: SKIPME */
2972 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2977 UNLOCK_DOLLARZERO_MUTEX;
2984 Perl_whichsig(pTHX_ const char *sig)
2986 register char* const* sigv;
2988 PERL_ARGS_ASSERT_WHICHSIG;
2989 PERL_UNUSED_CONTEXT;
2991 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2992 if (strEQ(sig,*sigv))
2993 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2995 if (strEQ(sig,"CHLD"))
2999 if (strEQ(sig,"CLD"))
3006 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3007 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3009 Perl_sighandler(int sig)
3012 #ifdef PERL_GET_SIG_CONTEXT
3013 dTHXa(PERL_GET_SIG_CONTEXT);
3020 SV * const tSv = PL_Sv;
3024 XPV * const tXpv = PL_Xpv;
3025 I32 old_ss_ix = PL_savestack_ix;
3028 if (!PL_psig_ptr[sig]) {
3029 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3034 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3035 /* Max number of items pushed there is 3*n or 4. We cannot fix
3036 infinity, so we fix 4 (in fact 5): */
3037 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3039 PL_savestack_ix += 5; /* Protect save in progress. */
3040 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3043 /* sv_2cv is too complicated, try a simpler variant first: */
3044 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3045 || SvTYPE(cv) != SVt_PVCV) {
3047 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3050 if (!cv || !CvROOT(cv)) {
3051 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3052 PL_sig_name[sig], (gv ? GvENAME(gv)
3059 sv = PL_psig_name[sig]
3060 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3061 : newSVpv(PL_sig_name[sig],0);
3065 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3066 /* make sure our assumption about the size of the SAVEs are correct:
3067 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3068 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3071 PUSHSTACKi(PERLSI_SIGNAL);
3074 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3076 struct sigaction oact;
3078 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3081 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3082 /* The siginfo fields signo, code, errno, pid, uid,
3083 * addr, status, and band are defined by POSIX/SUSv3. */
3084 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3085 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3086 #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. */
3087 hv_stores(sih, "errno", newSViv(sip->si_errno));
3088 hv_stores(sih, "status", newSViv(sip->si_status));
3089 hv_stores(sih, "uid", newSViv(sip->si_uid));
3090 hv_stores(sih, "pid", newSViv(sip->si_pid));
3091 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3092 hv_stores(sih, "band", newSViv(sip->si_band));
3096 mPUSHp((char *)sip, sizeof(*sip));
3104 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3107 if (SvTRUE(ERRSV)) {
3109 /* Handler "died", for example to get out of a restart-able read().
3110 * Before we re-do that on its behalf re-enable the signal which was
3111 * blocked by the system when we entered.
3113 #ifdef HAS_SIGPROCMASK
3114 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3120 sigaddset(&set,sig);
3121 sigprocmask(SIG_UNBLOCK, &set, NULL);
3124 /* Not clear if this will work */
3125 (void)rsignal(sig, SIG_IGN);
3126 (void)rsignal(sig, PL_csighandlerp);
3128 #endif /* !PERL_MICRO */
3132 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3133 PL_savestack_ix = old_ss_ix;
3136 PL_op = myop; /* Apparently not needed... */
3138 PL_Sv = tSv; /* Restore global temporaries. */
3145 S_restore_magic(pTHX_ const void *p)
3148 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3149 SV* const sv = mgs->mgs_sv;
3155 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3157 #ifdef PERL_OLD_COPY_ON_WRITE
3158 /* While magic was saved (and off) sv_setsv may well have seen
3159 this SV as a prime candidate for COW. */
3161 sv_force_normal_flags(sv, 0);
3164 if (mgs->mgs_readonly)
3166 if (mgs->mgs_magical)
3167 SvFLAGS(sv) |= mgs->mgs_magical;
3170 if (SvGMAGICAL(sv)) {
3171 /* downgrade public flags to private,
3172 and discard any other private flags */
3174 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3176 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3177 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3182 bumped = mgs->mgs_bumped;
3183 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3185 /* If we're still on top of the stack, pop us off. (That condition
3186 * will be satisfied if restore_magic was called explicitly, but *not*
3187 * if it's being called via leave_scope.)
3188 * The reason for doing this is that otherwise, things like sv_2cv()
3189 * may leave alloc gunk on the savestack, and some code
3190 * (e.g. sighandler) doesn't expect that...
3192 if (PL_savestack_ix == mgs->mgs_ss_ix)
3194 UV popval = SSPOPUV;
3195 assert(popval == SAVEt_DESTRUCTOR_X);
3196 PL_savestack_ix -= 2;
3198 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3199 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3202 if (SvREFCNT(sv) == 1) {
3203 /* We hold the last reference to this SV, which implies that the
3204 SV was deleted as a side effect of the routines we called.
3205 So artificially keep it alive a bit longer.
3206 We avoid turning on the TEMP flag, which can cause the SV's
3207 buffer to get stolen (and maybe other stuff). */
3208 int was_temp = SvTEMP(sv);
3216 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
3220 /* clean up the mess created by Perl_sighandler().
3221 * Note that this is only called during an exit in a signal handler;
3222 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3226 S_unwind_handler_stack(pTHX_ const void *p)
3231 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3235 =for apidoc magic_sethint
3237 Triggered by a store to %^H, records the key/value pair to
3238 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3239 anything that would need a deep copy. Maybe we should warn if we find a
3245 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3248 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3249 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3251 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3253 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3254 an alternative leaf in there, with PL_compiling.cop_hints being used if
3255 it's NULL. If needed for threads, the alternative could lock a mutex,
3256 or take other more complex action. */
3258 /* Something changed in %^H, so it will need to be restored on scope exit.
3259 Doing this here saves a lot of doing it manually in perl code (and
3260 forgetting to do it, and consequent subtle errors. */
3261 PL_hints |= HINT_LOCALIZE_HH;
3262 CopHINTHASH_set(&PL_compiling,
3263 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3268 =for apidoc magic_clearhint
3270 Triggered by a delete from %^H, records the key to
3271 C<PL_compiling.cop_hints_hash>.
3276 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3280 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3281 PERL_UNUSED_ARG(sv);
3283 assert(mg->mg_len == HEf_SVKEY);
3285 PERL_UNUSED_ARG(sv);
3287 PL_hints |= HINT_LOCALIZE_HH;
3288 CopHINTHASH_set(&PL_compiling,
3289 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3290 MUTABLE_SV(mg->mg_ptr), 0, 0));
3295 =for apidoc magic_clearhints
3297 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3302 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3304 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3305 PERL_UNUSED_ARG(sv);
3306 PERL_UNUSED_ARG(mg);
3307 cophh_free(CopHINTHASH_get(&PL_compiling));
3308 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3314 * c-indentation-style: bsd
3316 * indent-tabs-mode: t
3319 * ex: set ts=8 sts=4 sw=4 noet: