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); /* $& is in [0] */
978 CALLREG_NUMBUF_FETCH(rx,paren,sv);
981 sv_setsv(sv,&PL_sv_undef);
985 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
986 if (RX_LASTPAREN(rx)) {
987 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
991 sv_setsv(sv,&PL_sv_undef);
993 case '\016': /* ^N */
994 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
995 if (RX_LASTCLOSEPAREN(rx)) {
996 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
1001 sv_setsv(sv,&PL_sv_undef);
1005 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1006 CALLREG_NUMBUF_FETCH(rx,-2,sv);
1009 sv_setsv(sv,&PL_sv_undef);
1013 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1014 CALLREG_NUMBUF_FETCH(rx,-1,sv);
1017 sv_setsv(sv,&PL_sv_undef);
1020 if (GvIO(PL_last_in_gv)) {
1021 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1026 sv_setiv(sv, (IV)STATUS_CURRENT);
1027 #ifdef COMPLEX_STATUS
1028 SvUPGRADE(sv, SVt_PVLV);
1029 LvTARGOFF(sv) = PL_statusvalue;
1030 LvTARGLEN(sv) = PL_statusvalue_vms;
1035 if (!isGV_with_GP(PL_defoutgv))
1037 else if (GvIOp(PL_defoutgv))
1038 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1042 sv_setpv(sv,GvENAME(PL_defoutgv));
1043 sv_catpvs(sv,"_TOP");
1047 if (!isGV_with_GP(PL_defoutgv))
1049 else if (GvIOp(PL_defoutgv))
1050 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1052 s = GvENAME(PL_defoutgv);
1056 if (GvIO(PL_defoutgv))
1057 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1060 if (GvIO(PL_defoutgv))
1061 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1064 if (GvIO(PL_defoutgv))
1065 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1072 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1075 if (GvIO(PL_defoutgv))
1076 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1080 sv_copypv(sv, PL_ors_sv);
1084 IV const pid = (IV)PerlProc_getpid();
1085 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid)
1086 /* never set manually, or at least not since last fork */
1088 /* else a value has been assigned manually, so do nothing */
1096 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1098 sv_setnv(sv, (NV)errno);
1101 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1102 sv_setpv(sv, os2error(Perl_rc));
1105 sv_setpv(sv, errno ? Strerror(errno) : "");
1107 SvPOK_on(sv); /* may have got removed during taint processing */
1112 SvNOK_on(sv); /* what a wonderful hack! */
1115 sv_setiv(sv, (IV)PL_uid);
1118 sv_setiv(sv, (IV)PL_euid);
1121 sv_setiv(sv, (IV)PL_gid);
1124 sv_setiv(sv, (IV)PL_egid);
1126 #ifdef HAS_GETGROUPS
1128 Groups_t *gary = NULL;
1129 I32 i, num_groups = getgroups(0, gary);
1130 Newx(gary, num_groups, Groups_t);
1131 num_groups = getgroups(num_groups, gary);
1132 for (i = 0; i < num_groups; i++)
1133 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1136 (void)SvIOK_on(sv); /* what a wonderful hack! */
1146 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1148 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1150 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1152 if (uf && uf->uf_val)
1153 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1158 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1161 STRLEN len = 0, klen;
1162 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1163 const char * const ptr = MgPV_const(mg,klen);
1166 PERL_ARGS_ASSERT_MAGIC_SETENV;
1168 #ifdef DYNAMIC_ENV_FETCH
1169 /* We just undefd an environment var. Is a replacement */
1170 /* waiting in the wings? */
1172 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1174 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1178 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1179 /* And you'll never guess what the dog had */
1180 /* in its mouth... */
1182 MgTAINTEDDIR_off(mg);
1184 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1185 char pathbuf[256], eltbuf[256], *cp, *elt;
1188 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1190 do { /* DCL$PATH may be a search list */
1191 while (1) { /* as may dev portion of any element */
1192 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1193 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1194 cando_by_name(S_IWUSR,0,elt) ) {
1195 MgTAINTEDDIR_on(mg);
1199 if ((cp = strchr(elt, ':')) != NULL)
1201 if (my_trnlnm(elt, eltbuf, j++))
1207 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1210 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1211 const char * const strend = s + len;
1213 while (s < strend) {
1217 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1218 const char path_sep = '|';
1220 const char path_sep = ':';
1222 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1223 s, strend, path_sep, &i);
1225 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1227 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1229 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1231 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1232 MgTAINTEDDIR_on(mg);
1238 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1244 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1246 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1247 PERL_UNUSED_ARG(sv);
1248 my_setenv(MgPV_nolen_const(mg),NULL);
1253 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1256 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1257 PERL_UNUSED_ARG(mg);
1259 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1261 if (PL_localizing) {
1264 hv_iterinit(MUTABLE_HV(sv));
1265 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1267 my_setenv(hv_iterkey(entry, &keylen),
1268 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1276 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1279 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1280 PERL_UNUSED_ARG(sv);
1281 PERL_UNUSED_ARG(mg);
1283 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1291 #ifdef HAS_SIGPROCMASK
1293 restore_sigmask(pTHX_ SV *save_sv)
1295 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1296 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1300 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1303 /* Are we fetching a signal entry? */
1304 int i = (I16)mg->mg_private;
1306 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1309 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1314 sv_setsv(sv,PL_psig_ptr[i]);
1316 Sighandler_t sigstate = rsignal_state(i);
1317 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1318 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1321 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1322 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1325 /* cache state so we don't fetch it again */
1326 if(sigstate == (Sighandler_t) SIG_IGN)
1327 sv_setpvs(sv,"IGNORE");
1329 sv_setsv(sv,&PL_sv_undef);
1330 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1337 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1339 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1341 magic_setsig(NULL, mg);
1342 return sv_unmagic(sv, mg->mg_type);
1346 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1347 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1349 Perl_csighandler(int sig)
1352 #ifdef PERL_GET_SIG_CONTEXT
1353 dTHXa(PERL_GET_SIG_CONTEXT);
1357 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1358 (void) rsignal(sig, PL_csighandlerp);
1359 if (PL_sig_ignoring[sig]) return;
1361 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1362 if (PL_sig_defaulting[sig])
1363 #ifdef KILL_BY_SIGPRC
1364 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1379 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1380 /* Call the perl level handler now--
1381 * with risk we may be in malloc() or being destructed etc. */
1382 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1383 (*PL_sighandlerp)(sig, NULL, NULL);
1385 (*PL_sighandlerp)(sig);
1388 if (!PL_psig_pend) return;
1389 /* Set a flag to say this signal is pending, that is awaiting delivery after
1390 * the current Perl opcode completes */
1391 PL_psig_pend[sig]++;
1393 #ifndef SIG_PENDING_DIE_COUNT
1394 # define SIG_PENDING_DIE_COUNT 120
1396 /* Add one to say _a_ signal is pending */
1397 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1398 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1399 (unsigned long)SIG_PENDING_DIE_COUNT);
1403 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1405 Perl_csighandler_init(void)
1408 if (PL_sig_handlers_initted) return;
1410 for (sig = 1; sig < SIG_SIZE; sig++) {
1411 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1413 PL_sig_defaulting[sig] = 1;
1414 (void) rsignal(sig, PL_csighandlerp);
1416 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1417 PL_sig_ignoring[sig] = 0;
1420 PL_sig_handlers_initted = 1;
1424 #if defined HAS_SIGPROCMASK
1426 unblock_sigmask(pTHX_ void* newset)
1428 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1433 Perl_despatch_signals(pTHX)
1438 for (sig = 1; sig < SIG_SIZE; sig++) {
1439 if (PL_psig_pend[sig]) {
1441 #ifdef HAS_SIGPROCMASK
1442 /* From sigaction(2) (FreeBSD man page):
1443 * | Signal routines normally execute with the signal that
1444 * | caused their invocation blocked, but other signals may
1446 * Emulation of this behavior (from within Perl) is enabled
1450 sigset_t newset, oldset;
1452 sigemptyset(&newset);
1453 sigaddset(&newset, sig);
1454 sigprocmask(SIG_BLOCK, &newset, &oldset);
1455 was_blocked = sigismember(&oldset, sig);
1457 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1459 SAVEFREESV(save_sv);
1460 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1463 PL_psig_pend[sig] = 0;
1464 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1465 (*PL_sighandlerp)(sig, NULL, NULL);
1467 (*PL_sighandlerp)(sig);
1469 #ifdef HAS_SIGPROCMASK
1478 /* sv of NULL signifies that we're acting as magic_clearsig. */
1480 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1485 /* Need to be careful with SvREFCNT_dec(), because that can have side
1486 * effects (due to closures). We must make sure that the new disposition
1487 * is in place before it is called.
1491 #ifdef HAS_SIGPROCMASK
1495 register const char *s = MgPV_const(mg,len);
1497 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1500 if (strEQ(s,"__DIE__"))
1502 else if (strEQ(s,"__WARN__")
1503 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1504 /* Merge the existing behaviours, which are as follows:
1505 magic_setsig, we always set svp to &PL_warnhook
1506 (hence we always change the warnings handler)
1507 For magic_clearsig, we don't change the warnings handler if it's
1508 set to the &PL_warnhook. */
1511 Perl_croak(aTHX_ "No such hook: %s", s);
1514 if (*svp != PERL_WARNHOOK_FATAL)
1520 i = (I16)mg->mg_private;
1522 i = whichsig(s); /* ...no, a brick */
1523 mg->mg_private = (U16)i;
1527 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1530 #ifdef HAS_SIGPROCMASK
1531 /* Avoid having the signal arrive at a bad time, if possible. */
1534 sigprocmask(SIG_BLOCK, &set, &save);
1536 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1537 SAVEFREESV(save_sv);
1538 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1541 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1542 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1544 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1545 PL_sig_ignoring[i] = 0;
1547 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1548 PL_sig_defaulting[i] = 0;
1550 to_dec = PL_psig_ptr[i];
1552 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1553 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1555 /* Signals don't change name during the program's execution, so once
1556 they're cached in the appropriate slot of PL_psig_name, they can
1559 Ideally we'd find some way of making SVs at (C) compile time, or
1560 at least, doing most of the work. */
1561 if (!PL_psig_name[i]) {
1562 PL_psig_name[i] = newSVpvn(s, len);
1563 SvREADONLY_on(PL_psig_name[i]);
1566 SvREFCNT_dec(PL_psig_name[i]);
1567 PL_psig_name[i] = NULL;
1568 PL_psig_ptr[i] = NULL;
1571 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1573 (void)rsignal(i, PL_csighandlerp);
1576 *svp = SvREFCNT_inc_simple_NN(sv);
1578 if (sv && SvOK(sv)) {
1579 s = SvPV_force(sv, len);
1583 if (sv && strEQ(s,"IGNORE")) {
1585 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1586 PL_sig_ignoring[i] = 1;
1587 (void)rsignal(i, PL_csighandlerp);
1589 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1593 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1595 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1596 PL_sig_defaulting[i] = 1;
1597 (void)rsignal(i, PL_csighandlerp);
1599 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1605 * We should warn if HINT_STRICT_REFS, but without
1606 * access to a known hint bit in a known OP, we can't
1607 * tell whether HINT_STRICT_REFS is in force or not.
1609 if (!strchr(s,':') && !strchr(s,'\''))
1610 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1613 (void)rsignal(i, PL_csighandlerp);
1615 *svp = SvREFCNT_inc_simple_NN(sv);
1619 #ifdef HAS_SIGPROCMASK
1623 SvREFCNT_dec(to_dec);
1626 #endif /* !PERL_MICRO */
1629 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1632 PERL_ARGS_ASSERT_MAGIC_SETISA;
1633 PERL_UNUSED_ARG(sv);
1635 /* Skip _isaelem because _isa will handle it shortly */
1636 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1639 return magic_clearisa(NULL, mg);
1642 /* sv of NULL signifies that we're acting as magic_setisa. */
1644 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1649 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1651 /* Bail out if destruction is going on */
1652 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1655 av_clear(MUTABLE_AV(sv));
1657 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1658 /* This occurs with setisa_elem magic, which calls this
1660 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1662 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1663 SV **svp = AvARRAY((AV *)mg->mg_obj);
1664 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1666 stash = GvSTASH((GV *)*svp++);
1667 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1674 (const GV *)mg->mg_obj
1677 /* The stash may have been detached from the symbol table, so check its
1678 name before doing anything. */
1679 if (stash && HvENAME_get(stash))
1680 mro_isa_changed_in(stash);
1686 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1689 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1690 PERL_UNUSED_ARG(sv);
1691 PERL_UNUSED_ARG(mg);
1692 PL_amagic_generation++;
1698 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1700 HV * const hv = MUTABLE_HV(LvTARG(sv));
1703 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1704 PERL_UNUSED_ARG(mg);
1707 (void) hv_iterinit(hv);
1708 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1711 while (hv_iternext(hv))
1716 sv_setiv(sv, (IV)i);
1721 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1723 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1724 PERL_UNUSED_ARG(mg);
1726 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1732 =for apidoc magic_methcall
1734 Invoke a magic method (like FETCH).
1736 * sv and mg are the tied thingy and the tie magic;
1737 * meth is the name of the method to call;
1738 * argc is the number of args (in addition to $self) to pass to the method;
1739 the args themselves are any values following the argc argument.
1741 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1742 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
1744 Returns the SV (if any) returned by the method, or NULL on failure.
1751 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1758 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1762 if (flags & G_WRITING_TO_STDERR) {
1766 SAVESPTR(PL_stderrgv);
1770 PUSHSTACKi(PERLSI_MAGIC);
1774 PUSHs(SvTIED_obj(sv, mg));
1775 if (flags & G_UNDEF_FILL) {
1777 PUSHs(&PL_sv_undef);
1779 } else if (argc > 0) {
1781 va_start(args, argc);
1784 SV *const sv = va_arg(args, SV *);
1791 if (flags & G_DISCARD) {
1792 call_method(meth, G_SCALAR|G_DISCARD);
1795 if (call_method(meth, G_SCALAR))
1796 ret = *PL_stack_sp--;
1799 if (flags & G_WRITING_TO_STDERR)
1806 /* wrapper for magic_methcall that creates the first arg */
1809 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1815 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1818 if (mg->mg_len >= 0) {
1819 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1821 else if (mg->mg_len == HEf_SVKEY)
1822 arg1 = MUTABLE_SV(mg->mg_ptr);
1824 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1825 arg1 = newSViv((IV)(mg->mg_len));
1829 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1831 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1835 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1840 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1842 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1849 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1851 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1853 if (mg->mg_type == PERL_MAGIC_tiedelem)
1854 mg->mg_flags |= MGf_GSKIP;
1855 magic_methpack(sv,mg,"FETCH");
1860 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1866 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1868 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1869 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1870 * public flags indicate its value based on copying from $val. Doing
1871 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1872 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1873 * wrong if $val happened to be tainted, as sv hasn't got magic
1874 * enabled, even though taint magic is in the chain. In which case,
1875 * fake up a temporary tainted value (this is easier than temporarily
1876 * re-enabling magic on sv). */
1878 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1879 && (tmg->mg_len & 1))
1881 val = sv_mortalcopy(sv);
1887 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1892 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1894 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1896 return magic_methpack(sv,mg,"DELETE");
1901 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1907 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1909 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1911 retval = SvIV(retsv)-1;
1913 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1915 return (U32) retval;
1919 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1923 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1925 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1930 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1935 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1937 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1938 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1945 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1947 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1949 return magic_methpack(sv,mg,"EXISTS");
1953 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1957 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1958 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1960 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1962 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1964 if (HvEITER_get(hv))
1965 /* we are in an iteration so the hash cannot be empty */
1967 /* no xhv_eiter so now use FIRSTKEY */
1968 key = sv_newmortal();
1969 magic_nextpack(MUTABLE_SV(hv), mg, key);
1970 HvEITER_set(hv, NULL); /* need to reset iterator */
1971 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1974 /* there is a SCALAR method that we can call */
1975 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
1977 retval = &PL_sv_undef;
1982 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1985 GV * const gv = PL_DBline;
1986 const I32 i = SvTRUE(sv);
1987 SV ** const svp = av_fetch(GvAV(gv),
1988 atoi(MgPV_nolen_const(mg)), FALSE);
1990 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1992 if (svp && SvIOKp(*svp)) {
1993 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1995 /* set or clear breakpoint in the relevant control op */
1997 o->op_flags |= OPf_SPECIAL;
1999 o->op_flags &= ~OPf_SPECIAL;
2006 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2009 AV * const obj = MUTABLE_AV(mg->mg_obj);
2011 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2014 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
2022 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2025 AV * const obj = MUTABLE_AV(mg->mg_obj);
2027 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2030 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
2032 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2033 "Attempt to set length of freed array");
2039 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2043 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2044 PERL_UNUSED_ARG(sv);
2046 /* during global destruction, mg_obj may already have been freed */
2047 if (PL_in_clean_all)
2050 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2053 /* arylen scalar holds a pointer back to the array, but doesn't own a
2054 reference. Hence the we (the array) are about to go away with it
2055 still pointing at us. Clear its pointer, else it would be pointing
2056 at free memory. See the comment in sv_magic about reference loops,
2057 and why it can't own a reference to us. */
2064 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2067 SV* const lsv = LvTARG(sv);
2069 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2070 PERL_UNUSED_ARG(mg);
2072 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2073 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2074 if (found && found->mg_len >= 0) {
2075 I32 i = found->mg_len;
2077 sv_pos_b2u(lsv, &i);
2078 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
2087 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2090 SV* const lsv = LvTARG(sv);
2096 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2097 PERL_UNUSED_ARG(mg);
2099 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2100 found = mg_find(lsv, PERL_MAGIC_regex_global);
2106 #ifdef PERL_OLD_COPY_ON_WRITE
2108 sv_force_normal_flags(lsv, 0);
2110 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2113 else if (!SvOK(sv)) {
2117 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2119 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2122 ulen = sv_len_utf8(lsv);
2132 else if (pos > (SSize_t)len)
2137 sv_pos_u2b(lsv, &p, 0);
2141 found->mg_len = pos;
2142 found->mg_flags &= ~MGf_MINMATCH;
2148 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2151 SV * const lsv = LvTARG(sv);
2152 const char * const tmps = SvPV_const(lsv,len);
2153 STRLEN offs = LvTARGOFF(sv);
2154 STRLEN rem = LvTARGLEN(sv);
2156 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2157 PERL_UNUSED_ARG(mg);
2160 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
2163 if (rem > len - offs)
2165 sv_setpvn(sv, tmps + offs, rem);
2172 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2176 const char * const tmps = SvPV_const(sv, len);
2177 SV * const lsv = LvTARG(sv);
2178 STRLEN lvoff = LvTARGOFF(sv);
2179 STRLEN lvlen = LvTARGLEN(sv);
2181 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2182 PERL_UNUSED_ARG(mg);
2185 sv_utf8_upgrade(lsv);
2186 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2187 sv_insert(lsv, lvoff, lvlen, tmps, len);
2188 LvTARGLEN(sv) = sv_len_utf8(sv);
2191 else if (lsv && SvUTF8(lsv)) {
2193 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2194 LvTARGLEN(sv) = len;
2195 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2196 sv_insert(lsv, lvoff, lvlen, utf8, len);
2200 sv_insert(lsv, lvoff, lvlen, tmps, len);
2201 LvTARGLEN(sv) = len;
2208 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2212 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2213 PERL_UNUSED_ARG(sv);
2215 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2220 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2224 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2225 PERL_UNUSED_ARG(sv);
2227 /* update taint status */
2236 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2238 SV * const lsv = LvTARG(sv);
2240 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2241 PERL_UNUSED_ARG(mg);
2244 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2252 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2254 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2255 PERL_UNUSED_ARG(mg);
2256 do_vecset(sv); /* XXX slurp this routine */
2261 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2266 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2268 if (LvTARGLEN(sv)) {
2270 SV * const ahv = LvTARG(sv);
2271 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2276 AV *const av = MUTABLE_AV(LvTARG(sv));
2277 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2278 targ = AvARRAY(av)[LvTARGOFF(sv)];
2280 if (targ && (targ != &PL_sv_undef)) {
2281 /* somebody else defined it for us */
2282 SvREFCNT_dec(LvTARG(sv));
2283 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2285 SvREFCNT_dec(mg->mg_obj);
2287 mg->mg_flags &= ~MGf_REFCOUNTED;
2292 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2297 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2299 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2300 PERL_UNUSED_ARG(mg);
2304 sv_setsv(LvTARG(sv), sv);
2305 SvSETMAGIC(LvTARG(sv));
2311 Perl_vivify_defelem(pTHX_ SV *sv)
2317 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2319 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2322 SV * const ahv = LvTARG(sv);
2323 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2326 if (!value || value == &PL_sv_undef)
2327 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2330 AV *const av = MUTABLE_AV(LvTARG(sv));
2331 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2332 LvTARG(sv) = NULL; /* array can't be extended */
2334 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2335 if (!svp || (value = *svp) == &PL_sv_undef)
2336 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2339 SvREFCNT_inc_simple_void(value);
2340 SvREFCNT_dec(LvTARG(sv));
2343 SvREFCNT_dec(mg->mg_obj);
2345 mg->mg_flags &= ~MGf_REFCOUNTED;
2349 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2351 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2352 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2357 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2359 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2360 PERL_UNUSED_CONTEXT;
2361 PERL_UNUSED_ARG(sv);
2367 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2369 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2371 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2373 if (uf && uf->uf_set)
2374 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2379 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2381 const char type = mg->mg_type;
2383 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2385 if (type == PERL_MAGIC_qr) {
2386 } else if (type == PERL_MAGIC_bm) {
2389 } else if (type == PERL_MAGIC_study) {
2390 if (!isGV_with_GP(sv))
2393 assert(type == PERL_MAGIC_fm);
2395 return sv_unmagic(sv, type);
2398 #ifdef USE_LOCALE_COLLATE
2400 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2402 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2405 * RenE<eacute> Descartes said "I think not."
2406 * and vanished with a faint plop.
2408 PERL_UNUSED_CONTEXT;
2409 PERL_UNUSED_ARG(sv);
2411 Safefree(mg->mg_ptr);
2417 #endif /* USE_LOCALE_COLLATE */
2419 /* Just clear the UTF-8 cache data. */
2421 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2423 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2424 PERL_UNUSED_CONTEXT;
2425 PERL_UNUSED_ARG(sv);
2426 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2428 mg->mg_len = -1; /* The mg_len holds the len cache. */
2433 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2436 register const char *s;
2438 register const REGEXP * rx;
2439 const char * const remaining = mg->mg_ptr + 1;
2444 PERL_ARGS_ASSERT_MAGIC_SET;
2446 switch (*mg->mg_ptr) {
2447 case '\015': /* $^MATCH */
2448 if (strEQ(remaining, "ATCH"))
2450 case '`': /* ${^PREMATCH} caught below */
2452 paren = RX_BUFF_IDX_PREMATCH;
2454 case '\'': /* ${^POSTMATCH} caught below */
2456 paren = RX_BUFF_IDX_POSTMATCH;
2460 paren = RX_BUFF_IDX_FULLMATCH;
2462 case '1': case '2': case '3': case '4':
2463 case '5': case '6': case '7': case '8': case '9':
2464 paren = atoi(mg->mg_ptr);
2466 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2467 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2469 /* Croak with a READONLY error when a numbered match var is
2470 * set without a previous pattern match. Unless it's C<local $1>
2472 if (!PL_localizing) {
2473 Perl_croak_no_modify(aTHX);
2477 case '\001': /* ^A */
2478 sv_setsv(PL_bodytarget, sv);
2479 /* mg_set() has temporarily made sv non-magical */
2481 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2482 SvTAINTED_on(PL_bodytarget);
2484 SvTAINTED_off(PL_bodytarget);
2487 case '\003': /* ^C */
2488 PL_minus_c = cBOOL(SvIV(sv));
2491 case '\004': /* ^D */
2493 s = SvPV_nolen_const(sv);
2494 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2495 if (DEBUG_x_TEST || DEBUG_B_TEST)
2496 dump_all_perl(!DEBUG_B_TEST);
2498 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2501 case '\005': /* ^E */
2502 if (*(mg->mg_ptr+1) == '\0') {
2504 set_vaxc_errno(SvIV(sv));
2507 SetLastError( SvIV(sv) );
2510 os2_setsyserrno(SvIV(sv));
2512 /* will anyone ever use this? */
2513 SETERRNO(SvIV(sv), 4);
2518 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2519 SvREFCNT_dec(PL_encoding);
2520 if (SvOK(sv) || SvGMAGICAL(sv)) {
2521 PL_encoding = newSVsv(sv);
2528 case '\006': /* ^F */
2529 PL_maxsysfd = SvIV(sv);
2531 case '\010': /* ^H */
2532 PL_hints = SvIV(sv);
2534 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2535 Safefree(PL_inplace);
2536 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2538 case '\017': /* ^O */
2539 if (*(mg->mg_ptr+1) == '\0') {
2540 Safefree(PL_osname);
2543 TAINT_PROPER("assigning to $^O");
2544 PL_osname = savesvpv(sv);
2547 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2549 const char *const start = SvPV(sv, len);
2550 const char *out = (const char*)memchr(start, '\0', len);
2554 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2555 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2557 /* Opening for input is more common than opening for output, so
2558 ensure that hints for input are sooner on linked list. */
2559 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2561 : newSVpvs_flags("", SvUTF8(sv));
2562 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2565 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2567 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2571 case '\020': /* ^P */
2572 if (*remaining == '\0') { /* ^P */
2573 PL_perldb = SvIV(sv);
2574 if (PL_perldb && !PL_DBsingle)
2577 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2579 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2583 case '\024': /* ^T */
2585 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2587 PL_basetime = (Time_t)SvIV(sv);
2590 case '\025': /* ^UTF8CACHE */
2591 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2592 PL_utf8cache = (signed char) sv_2iv(sv);
2595 case '\027': /* ^W & $^WARNING_BITS */
2596 if (*(mg->mg_ptr+1) == '\0') {
2597 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2599 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2600 | (i ? G_WARN_ON : G_WARN_OFF) ;
2603 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2604 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2605 if (!SvPOK(sv) && PL_localizing) {
2606 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2607 PL_compiling.cop_warnings = pWARN_NONE;
2612 int accumulate = 0 ;
2613 int any_fatals = 0 ;
2614 const char * const ptr = SvPV_const(sv, len) ;
2615 for (i = 0 ; i < len ; ++i) {
2616 accumulate |= ptr[i] ;
2617 any_fatals |= (ptr[i] & 0xAA) ;
2620 if (!specialWARN(PL_compiling.cop_warnings))
2621 PerlMemShared_free(PL_compiling.cop_warnings);
2622 PL_compiling.cop_warnings = pWARN_NONE;
2624 /* Yuck. I can't see how to abstract this: */
2625 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2626 WARN_ALL) && !any_fatals) {
2627 if (!specialWARN(PL_compiling.cop_warnings))
2628 PerlMemShared_free(PL_compiling.cop_warnings);
2629 PL_compiling.cop_warnings = pWARN_ALL;
2630 PL_dowarn |= G_WARN_ONCE ;
2634 const char *const p = SvPV_const(sv, len);
2636 PL_compiling.cop_warnings
2637 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2640 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2641 PL_dowarn |= G_WARN_ONCE ;
2649 if (PL_localizing) {
2650 if (PL_localizing == 1)
2651 SAVESPTR(PL_last_in_gv);
2653 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2654 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2657 if (isGV_with_GP(PL_defoutgv)) {
2658 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2659 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2660 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2664 if (isGV_with_GP(PL_defoutgv)) {
2665 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2666 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2667 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2671 if (isGV_with_GP(PL_defoutgv))
2672 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2675 if (isGV_with_GP(PL_defoutgv)) {
2676 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2677 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2678 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2682 if (isGV_with_GP(PL_defoutgv))
2683 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2687 IO * const io = GvIO(PL_defoutgv);
2690 if ((SvIV(sv)) == 0)
2691 IoFLAGS(io) &= ~IOf_FLUSH;
2693 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2694 PerlIO *ofp = IoOFP(io);
2696 (void)PerlIO_flush(ofp);
2697 IoFLAGS(io) |= IOf_FLUSH;
2703 SvREFCNT_dec(PL_rs);
2704 PL_rs = newSVsv(sv);
2707 SvREFCNT_dec(PL_ors_sv);
2708 if (SvOK(sv) || SvGMAGICAL(sv)) {
2709 PL_ors_sv = newSVsv(sv);
2716 CopARYBASE_set(&PL_compiling, SvIV(sv));
2719 #ifdef COMPLEX_STATUS
2720 if (PL_localizing == 2) {
2721 SvUPGRADE(sv, SVt_PVLV);
2722 PL_statusvalue = LvTARGOFF(sv);
2723 PL_statusvalue_vms = LvTARGLEN(sv);
2727 #ifdef VMSISH_STATUS
2729 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2732 STATUS_UNIX_EXIT_SET(SvIV(sv));
2737 # define PERL_VMS_BANG vaxc$errno
2739 # define PERL_VMS_BANG 0
2741 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2742 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2747 if (PL_delaymagic) {
2748 PL_delaymagic |= DM_RUID;
2749 break; /* don't do magic till later */
2752 (void)setruid((Uid_t)PL_uid);
2755 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2757 #ifdef HAS_SETRESUID
2758 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2760 if (PL_uid == PL_euid) { /* special case $< = $> */
2762 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2763 if (PL_uid != 0 && PerlProc_getuid() == 0)
2764 (void)PerlProc_setuid(0);
2766 (void)PerlProc_setuid(PL_uid);
2768 PL_uid = PerlProc_getuid();
2769 Perl_croak(aTHX_ "setruid() not implemented");
2774 PL_uid = PerlProc_getuid();
2778 if (PL_delaymagic) {
2779 PL_delaymagic |= DM_EUID;
2780 break; /* don't do magic till later */
2783 (void)seteuid((Uid_t)PL_euid);
2786 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2788 #ifdef HAS_SETRESUID
2789 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2791 if (PL_euid == PL_uid) /* special case $> = $< */
2792 PerlProc_setuid(PL_euid);
2794 PL_euid = PerlProc_geteuid();
2795 Perl_croak(aTHX_ "seteuid() not implemented");
2800 PL_euid = PerlProc_geteuid();
2804 if (PL_delaymagic) {
2805 PL_delaymagic |= DM_RGID;
2806 break; /* don't do magic till later */
2809 (void)setrgid((Gid_t)PL_gid);
2812 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2814 #ifdef HAS_SETRESGID
2815 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2817 if (PL_gid == PL_egid) /* special case $( = $) */
2818 (void)PerlProc_setgid(PL_gid);
2820 PL_gid = PerlProc_getgid();
2821 Perl_croak(aTHX_ "setrgid() not implemented");
2826 PL_gid = PerlProc_getgid();
2829 #ifdef HAS_SETGROUPS
2831 const char *p = SvPV_const(sv, len);
2832 Groups_t *gary = NULL;
2833 #ifdef _SC_NGROUPS_MAX
2834 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2839 int maxgrp = NGROUPS;
2845 for (i = 0; i < maxgrp; ++i) {
2846 while (*p && !isSPACE(*p))
2853 Newx(gary, i + 1, Groups_t);
2855 Renew(gary, i + 1, Groups_t);
2859 (void)setgroups(i, gary);
2862 #else /* HAS_SETGROUPS */
2864 #endif /* HAS_SETGROUPS */
2865 if (PL_delaymagic) {
2866 PL_delaymagic |= DM_EGID;
2867 break; /* don't do magic till later */
2870 (void)setegid((Gid_t)PL_egid);
2873 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2875 #ifdef HAS_SETRESGID
2876 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2878 if (PL_egid == PL_gid) /* special case $) = $( */
2879 (void)PerlProc_setgid(PL_egid);
2881 PL_egid = PerlProc_getegid();
2882 Perl_croak(aTHX_ "setegid() not implemented");
2887 PL_egid = PerlProc_getegid();
2890 PL_chopset = SvPV_force(sv,len);
2893 /* Store the pid in mg->mg_obj so we can tell when a fork has
2894 occurred. mg->mg_obj points to *$ by default, so clear it. */
2895 if (isGV(mg->mg_obj)) {
2896 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2897 SvREFCNT_dec(mg->mg_obj);
2898 mg->mg_flags |= MGf_REFCOUNTED;
2899 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2901 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2904 LOCK_DOLLARZERO_MUTEX;
2905 #ifdef HAS_SETPROCTITLE
2906 /* The BSDs don't show the argv[] in ps(1) output, they
2907 * show a string from the process struct and provide
2908 * the setproctitle() routine to manipulate that. */
2909 if (PL_origalen != 1) {
2910 s = SvPV_const(sv, len);
2911 # if __FreeBSD_version > 410001
2912 /* The leading "-" removes the "perl: " prefix,
2913 * but not the "(perl) suffix from the ps(1)
2914 * output, because that's what ps(1) shows if the
2915 * argv[] is modified. */
2916 setproctitle("-%s", s);
2917 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2918 /* This doesn't really work if you assume that
2919 * $0 = 'foobar'; will wipe out 'perl' from the $0
2920 * because in ps(1) output the result will be like
2921 * sprintf("perl: %s (perl)", s)
2922 * I guess this is a security feature:
2923 * one (a user process) cannot get rid of the original name.
2925 setproctitle("%s", s);
2928 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2929 if (PL_origalen != 1) {
2931 s = SvPV_const(sv, len);
2932 un.pst_command = (char *)s;
2933 pstat(PSTAT_SETCMD, un, len, 0, 0);
2936 if (PL_origalen > 1) {
2937 /* PL_origalen is set in perl_parse(). */
2938 s = SvPV_force(sv,len);
2939 if (len >= (STRLEN)PL_origalen-1) {
2940 /* Longer than original, will be truncated. We assume that
2941 * PL_origalen bytes are available. */
2942 Copy(s, PL_origargv[0], PL_origalen-1, char);
2945 /* Shorter than original, will be padded. */
2947 /* Special case for Mac OS X: see [perl #38868] */
2950 /* Is the space counterintuitive? Yes.
2951 * (You were expecting \0?)
2952 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2954 const int pad = ' ';
2956 Copy(s, PL_origargv[0], len, char);
2957 PL_origargv[0][len] = 0;
2958 memset(PL_origargv[0] + len + 1,
2959 pad, PL_origalen - len - 1);
2961 PL_origargv[0][PL_origalen-1] = 0;
2962 for (i = 1; i < PL_origargc; i++)
2964 #ifdef HAS_PRCTL_SET_NAME
2965 /* Set the legacy process name in addition to the POSIX name on Linux */
2966 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2967 /* diag_listed_as: SKIPME */
2968 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2973 UNLOCK_DOLLARZERO_MUTEX;
2980 Perl_whichsig(pTHX_ const char *sig)
2982 register char* const* sigv;
2984 PERL_ARGS_ASSERT_WHICHSIG;
2985 PERL_UNUSED_CONTEXT;
2987 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2988 if (strEQ(sig,*sigv))
2989 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2991 if (strEQ(sig,"CHLD"))
2995 if (strEQ(sig,"CLD"))
3002 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3003 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3005 Perl_sighandler(int sig)
3008 #ifdef PERL_GET_SIG_CONTEXT
3009 dTHXa(PERL_GET_SIG_CONTEXT);
3016 SV * const tSv = PL_Sv;
3020 XPV * const tXpv = PL_Xpv;
3021 I32 old_ss_ix = PL_savestack_ix;
3024 if (!PL_psig_ptr[sig]) {
3025 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3030 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3031 /* Max number of items pushed there is 3*n or 4. We cannot fix
3032 infinity, so we fix 4 (in fact 5): */
3033 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3035 PL_savestack_ix += 5; /* Protect save in progress. */
3036 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3039 /* sv_2cv is too complicated, try a simpler variant first: */
3040 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3041 || SvTYPE(cv) != SVt_PVCV) {
3043 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3046 if (!cv || !CvROOT(cv)) {
3047 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3048 PL_sig_name[sig], (gv ? GvENAME(gv)
3055 sv = PL_psig_name[sig]
3056 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3057 : newSVpv(PL_sig_name[sig],0);
3061 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3062 /* make sure our assumption about the size of the SAVEs are correct:
3063 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3064 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3067 PUSHSTACKi(PERLSI_SIGNAL);
3070 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3072 struct sigaction oact;
3074 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3077 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3078 /* The siginfo fields signo, code, errno, pid, uid,
3079 * addr, status, and band are defined by POSIX/SUSv3. */
3080 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3081 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3082 #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. */
3083 hv_stores(sih, "errno", newSViv(sip->si_errno));
3084 hv_stores(sih, "status", newSViv(sip->si_status));
3085 hv_stores(sih, "uid", newSViv(sip->si_uid));
3086 hv_stores(sih, "pid", newSViv(sip->si_pid));
3087 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3088 hv_stores(sih, "band", newSViv(sip->si_band));
3092 mPUSHp((char *)sip, sizeof(*sip));
3100 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3103 if (SvTRUE(ERRSV)) {
3105 /* Handler "died", for example to get out of a restart-able read().
3106 * Before we re-do that on its behalf re-enable the signal which was
3107 * blocked by the system when we entered.
3109 #ifdef HAS_SIGPROCMASK
3110 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3116 sigaddset(&set,sig);
3117 sigprocmask(SIG_UNBLOCK, &set, NULL);
3120 /* Not clear if this will work */
3121 (void)rsignal(sig, SIG_IGN);
3122 (void)rsignal(sig, PL_csighandlerp);
3124 #endif /* !PERL_MICRO */
3128 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3129 PL_savestack_ix = old_ss_ix;
3132 PL_op = myop; /* Apparently not needed... */
3134 PL_Sv = tSv; /* Restore global temporaries. */
3141 S_restore_magic(pTHX_ const void *p)
3144 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3145 SV* const sv = mgs->mgs_sv;
3151 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3153 #ifdef PERL_OLD_COPY_ON_WRITE
3154 /* While magic was saved (and off) sv_setsv may well have seen
3155 this SV as a prime candidate for COW. */
3157 sv_force_normal_flags(sv, 0);
3160 if (mgs->mgs_readonly)
3162 if (mgs->mgs_magical)
3163 SvFLAGS(sv) |= mgs->mgs_magical;
3166 if (SvGMAGICAL(sv)) {
3167 /* downgrade public flags to private,
3168 and discard any other private flags */
3170 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3172 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3173 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3178 bumped = mgs->mgs_bumped;
3179 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3181 /* If we're still on top of the stack, pop us off. (That condition
3182 * will be satisfied if restore_magic was called explicitly, but *not*
3183 * if it's being called via leave_scope.)
3184 * The reason for doing this is that otherwise, things like sv_2cv()
3185 * may leave alloc gunk on the savestack, and some code
3186 * (e.g. sighandler) doesn't expect that...
3188 if (PL_savestack_ix == mgs->mgs_ss_ix)
3190 UV popval = SSPOPUV;
3191 assert(popval == SAVEt_DESTRUCTOR_X);
3192 PL_savestack_ix -= 2;
3194 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3195 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3198 if (SvREFCNT(sv) == 1) {
3199 /* We hold the last reference to this SV, which implies that the
3200 SV was deleted as a side effect of the routines we called.
3201 So artificially keep it alive a bit longer.
3202 We avoid turning on the TEMP flag, which can cause the SV's
3203 buffer to get stolen (and maybe other stuff). */
3204 int was_temp = SvTEMP(sv);
3212 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
3216 /* clean up the mess created by Perl_sighandler().
3217 * Note that this is only called during an exit in a signal handler;
3218 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3222 S_unwind_handler_stack(pTHX_ const void *p)
3227 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3231 =for apidoc magic_sethint
3233 Triggered by a store to %^H, records the key/value pair to
3234 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3235 anything that would need a deep copy. Maybe we should warn if we find a
3241 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3244 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3245 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3247 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3249 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3250 an alternative leaf in there, with PL_compiling.cop_hints being used if
3251 it's NULL. If needed for threads, the alternative could lock a mutex,
3252 or take other more complex action. */
3254 /* Something changed in %^H, so it will need to be restored on scope exit.
3255 Doing this here saves a lot of doing it manually in perl code (and
3256 forgetting to do it, and consequent subtle errors. */
3257 PL_hints |= HINT_LOCALIZE_HH;
3258 CopHINTHASH_set(&PL_compiling,
3259 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3264 =for apidoc magic_clearhint
3266 Triggered by a delete from %^H, records the key to
3267 C<PL_compiling.cop_hints_hash>.
3272 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3276 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3277 PERL_UNUSED_ARG(sv);
3279 assert(mg->mg_len == HEf_SVKEY);
3281 PERL_UNUSED_ARG(sv);
3283 PL_hints |= HINT_LOCALIZE_HH;
3284 CopHINTHASH_set(&PL_compiling,
3285 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3286 MUTABLE_SV(mg->mg_ptr), 0, 0));
3291 =for apidoc magic_clearhints
3293 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3298 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3300 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3301 PERL_UNUSED_ARG(sv);
3302 PERL_UNUSED_ARG(mg);
3303 cophh_free(CopHINTHASH_get(&PL_compiling));
3304 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3310 * c-indentation-style: bsd
3312 * indent-tabs-mode: t
3315 * ex: set ts=8 sts=4 sw=4 noet: