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)))
168 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
171 S_is_container_magic(const MAGIC *mg)
174 switch (mg->mg_type) {
177 case PERL_MAGIC_regex_global:
178 case PERL_MAGIC_nkeys:
179 #ifdef USE_LOCALE_COLLATE
180 case PERL_MAGIC_collxfrm:
183 case PERL_MAGIC_taint:
185 case PERL_MAGIC_vstring:
186 case PERL_MAGIC_utf8:
187 case PERL_MAGIC_substr:
188 case PERL_MAGIC_defelem:
189 case PERL_MAGIC_arylen:
191 case PERL_MAGIC_backref:
192 case PERL_MAGIC_arylen_p:
193 case PERL_MAGIC_rhash:
194 case PERL_MAGIC_symtab:
195 case PERL_MAGIC_tied: /* treat as value, so 'local @tied' isn't tied */
196 case PERL_MAGIC_checkcall:
206 Do magic after a value is retrieved from the SV. See C<sv_magic>.
212 Perl_mg_get(pTHX_ SV *sv)
215 const I32 mgs_ix = SSNEW(sizeof(MGS));
217 MAGIC *newmg, *head, *cur, *mg;
219 PERL_ARGS_ASSERT_MG_GET;
221 save_magic(mgs_ix, sv);
223 /* We must call svt_get(sv, mg) for each valid entry in the linked
224 list of magic. svt_get() may delete the current entry, add new
225 magic to the head of the list, or upgrade the SV. AMS 20010810 */
227 newmg = cur = head = mg = SvMAGIC(sv);
229 const MGVTBL * const vtbl = mg->mg_virtual;
230 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
232 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
233 vtbl->svt_get(aTHX_ sv, mg);
235 /* guard against magic having been deleted - eg FETCH calling
238 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
242 /* recalculate flags if this entry was deleted. */
243 if (mg->mg_flags & MGf_GSKIP)
244 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
250 /* Have we finished with the new entries we saw? Start again
251 where we left off (unless there are more new entries). */
259 /* Were any new entries added? */
260 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
264 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
268 restore_magic(INT2PTR(void *, (IV)mgs_ix));
275 Do magic after a value is assigned to the SV. See C<sv_magic>.
281 Perl_mg_set(pTHX_ SV *sv)
284 const I32 mgs_ix = SSNEW(sizeof(MGS));
288 PERL_ARGS_ASSERT_MG_SET;
290 save_magic(mgs_ix, sv);
292 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
293 const MGVTBL* vtbl = mg->mg_virtual;
294 nextmg = mg->mg_moremagic; /* it may delete itself */
295 if (mg->mg_flags & MGf_GSKIP) {
296 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
297 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
299 if (PL_localizing == 2 && (!S_is_container_magic(mg) || sv == DEFSV))
301 if (vtbl && vtbl->svt_set)
302 vtbl->svt_set(aTHX_ sv, mg);
305 restore_magic(INT2PTR(void*, (IV)mgs_ix));
310 =for apidoc mg_length
312 Report on the SV's length. See C<sv_magic>.
318 Perl_mg_length(pTHX_ SV *sv)
324 PERL_ARGS_ASSERT_MG_LENGTH;
326 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
327 const MGVTBL * const vtbl = mg->mg_virtual;
328 if (vtbl && vtbl->svt_len) {
329 const I32 mgs_ix = SSNEW(sizeof(MGS));
330 save_magic(mgs_ix, sv);
331 /* omit MGf_GSKIP -- not changed here */
332 len = vtbl->svt_len(aTHX_ sv, mg);
333 restore_magic(INT2PTR(void*, (IV)mgs_ix));
339 /* You can't know whether it's UTF-8 until you get the string again...
341 const U8 *s = (U8*)SvPV_const(sv, len);
344 len = utf8_length(s, s + len);
351 Perl_mg_size(pTHX_ SV *sv)
355 PERL_ARGS_ASSERT_MG_SIZE;
357 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
358 const MGVTBL* const vtbl = mg->mg_virtual;
359 if (vtbl && vtbl->svt_len) {
360 const I32 mgs_ix = SSNEW(sizeof(MGS));
362 save_magic(mgs_ix, sv);
363 /* omit MGf_GSKIP -- not changed here */
364 len = vtbl->svt_len(aTHX_ sv, mg);
365 restore_magic(INT2PTR(void*, (IV)mgs_ix));
372 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
376 Perl_croak(aTHX_ "Size magic not implemented");
385 Clear something magical that the SV represents. See C<sv_magic>.
391 Perl_mg_clear(pTHX_ SV *sv)
393 const I32 mgs_ix = SSNEW(sizeof(MGS));
397 PERL_ARGS_ASSERT_MG_CLEAR;
399 save_magic(mgs_ix, sv);
401 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
402 const MGVTBL* const vtbl = mg->mg_virtual;
403 /* omit GSKIP -- never set here */
405 nextmg = mg->mg_moremagic; /* it may delete itself */
407 if (vtbl && vtbl->svt_clear)
408 vtbl->svt_clear(aTHX_ sv, mg);
411 restore_magic(INT2PTR(void*, (IV)mgs_ix));
416 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
425 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
426 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
438 Finds the magic pointer for type matching the SV. See C<sv_magic>.
444 Perl_mg_find(pTHX_ const SV *sv, int type)
446 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
450 =for apidoc mg_findext
452 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
459 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
461 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
467 Copies the magic from one SV to another. See C<sv_magic>.
473 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
478 PERL_ARGS_ASSERT_MG_COPY;
480 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
481 const MGVTBL* const vtbl = mg->mg_virtual;
482 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
483 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
486 const char type = mg->mg_type;
487 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
489 (type == PERL_MAGIC_tied)
491 : (type == PERL_MAGIC_regdata && mg->mg_obj)
494 toLOWER(type), key, klen);
503 =for apidoc mg_localize
505 Copy some of the magic from an existing SV to new localized version of that
506 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
509 If setmagic is false then no set magic will be called on the new (empty) SV.
510 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
511 and that will handle the magic.
517 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
528 const MGVTBL* const vtbl = mg->mg_virtual;
529 if (!S_is_container_magic(mg))
532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
533 (void)vtbl->svt_local(aTHX_ nsv, mg);
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
538 /* container types should remain read-only across localization */
539 SvFLAGS(nsv) |= SvREADONLY(sv);
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
552 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
554 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
559 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
573 Free any magic storage used by the SV. See C<sv_magic>.
579 Perl_mg_free(pTHX_ SV *sv)
584 PERL_ARGS_ASSERT_MG_FREE;
586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
587 moremagic = mg->mg_moremagic;
588 mg_free_struct(sv, mg);
589 SvMAGIC_set(sv, moremagic);
591 SvMAGIC_set(sv, NULL);
597 =for apidoc Am|void|mg_free_type|SV *sv|int how
599 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
605 Perl_mg_free_type(pTHX_ SV *sv, int how)
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
611 moremg = mg->mg_moremagic;
612 if (mg->mg_type == how) {
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
632 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
637 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
640 register const REGEXP * const rx = PM_GETRE(PL_curpm);
642 if (mg->mg_obj) { /* @+ */
643 /* return the number possible */
644 return RX_NPARENS(rx);
646 I32 paren = RX_LASTPAREN(rx);
648 /* return the last filled */
650 && (RX_OFFS(rx)[paren].start == -1
651 || RX_OFFS(rx)[paren].end == -1) )
662 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
666 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
669 register const REGEXP * const rx = PM_GETRE(PL_curpm);
671 register const I32 paren = mg->mg_len;
676 if (paren <= (I32)RX_NPARENS(rx) &&
677 (s = RX_OFFS(rx)[paren].start) != -1 &&
678 (t = RX_OFFS(rx)[paren].end) != -1)
681 if (mg->mg_obj) /* @+ */
686 if (i > 0 && RX_MATCH_UTF8(rx)) {
687 const char * const b = RX_SUBBEG(rx);
689 i = utf8_length((U8*)b, (U8*)(b+i));
700 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
702 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
705 Perl_croak_no_modify(aTHX);
706 NORETURN_FUNCTION_END;
710 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
715 register const REGEXP * rx;
716 const char * const remaining = mg->mg_ptr + 1;
718 PERL_ARGS_ASSERT_MAGIC_LEN;
720 switch (*mg->mg_ptr) {
722 if (*remaining == '\0') { /* ^P */
724 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
726 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
730 case '\015': /* $^MATCH */
731 if (strEQ(remaining, "ATCH")) {
738 paren = RX_BUFF_IDX_PREMATCH;
742 paren = RX_BUFF_IDX_POSTMATCH;
746 paren = RX_BUFF_IDX_FULLMATCH;
748 case '1': case '2': case '3': case '4':
749 case '5': case '6': case '7': case '8': case '9':
750 paren = atoi(mg->mg_ptr);
752 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
754 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
757 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
760 if (ckWARN(WARN_UNINITIALIZED))
765 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
766 paren = RX_LASTPAREN(rx);
771 case '\016': /* ^N */
772 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
773 paren = RX_LASTCLOSEPAREN(rx);
780 if (!SvPOK(sv) && SvNIOK(sv)) {
788 #define SvRTRIM(sv) STMT_START { \
790 STRLEN len = SvCUR(sv); \
791 char * const p = SvPVX(sv); \
792 while (len > 0 && isSPACE(p[len-1])) \
794 SvCUR_set(sv, len); \
800 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
802 PERL_ARGS_ASSERT_EMULATE_COP_IO;
804 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
805 sv_setsv(sv, &PL_sv_undef);
809 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
810 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
815 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
816 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
824 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
828 register const char *s = NULL;
830 const char * const remaining = mg->mg_ptr + 1;
831 const char nextchar = *remaining;
833 PERL_ARGS_ASSERT_MAGIC_GET;
835 switch (*mg->mg_ptr) {
836 case '\001': /* ^A */
837 sv_setsv(sv, PL_bodytarget);
838 if (SvTAINTED(PL_bodytarget))
841 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
842 if (nextchar == '\0') {
843 sv_setiv(sv, (IV)PL_minus_c);
845 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
846 sv_setiv(sv, (IV)STATUS_NATIVE);
850 case '\004': /* ^D */
851 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
853 case '\005': /* ^E */
854 if (nextchar == '\0') {
857 # include <descrip.h>
858 # include <starlet.h>
860 $DESCRIPTOR(msgdsc,msg);
861 sv_setnv(sv,(NV) vaxc$errno);
862 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
863 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
868 if (!(_emx_env & 0x200)) { /* Under DOS */
869 sv_setnv(sv, (NV)errno);
870 sv_setpv(sv, errno ? Strerror(errno) : "");
872 if (errno != errno_isOS2) {
873 const int tmp = _syserrno();
874 if (tmp) /* 2nd call to _syserrno() makes it 0 */
877 sv_setnv(sv, (NV)Perl_rc);
878 sv_setpv(sv, os2error(Perl_rc));
882 const DWORD dwErr = GetLastError();
883 sv_setnv(sv, (NV)dwErr);
885 PerlProc_GetOSError(sv, dwErr);
894 sv_setnv(sv, (NV)errno);
895 sv_setpv(sv, errno ? Strerror(errno) : "");
900 SvNOK_on(sv); /* what a wonderful hack! */
902 else if (strEQ(remaining, "NCODING"))
903 sv_setsv(sv, PL_encoding);
905 case '\006': /* ^F */
906 sv_setiv(sv, (IV)PL_maxsysfd);
908 case '\007': /* ^GLOBAL_PHASE */
909 if (strEQ(remaining, "LOBAL_PHASE")) {
910 sv_setpvn(sv, PL_phase_names[PL_phase],
911 strlen(PL_phase_names[PL_phase]));
914 case '\010': /* ^H */
915 sv_setiv(sv, (IV)PL_hints);
917 case '\011': /* ^I */ /* NOT \t in EBCDIC */
918 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
920 case '\017': /* ^O & ^OPEN */
921 if (nextchar == '\0') {
922 sv_setpv(sv, PL_osname);
925 else if (strEQ(remaining, "PEN")) {
926 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
930 if (nextchar == '\0') { /* ^P */
931 sv_setiv(sv, (IV)PL_perldb);
932 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
933 goto do_prematch_fetch;
934 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
935 goto do_postmatch_fetch;
938 case '\023': /* ^S */
939 if (nextchar == '\0') {
940 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
943 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
948 case '\024': /* ^T */
949 if (nextchar == '\0') {
951 sv_setnv(sv, PL_basetime);
953 sv_setiv(sv, (IV)PL_basetime);
956 else if (strEQ(remaining, "AINT"))
957 sv_setiv(sv, PL_tainting
958 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
961 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
962 if (strEQ(remaining, "NICODE"))
963 sv_setuv(sv, (UV) PL_unicode);
964 else if (strEQ(remaining, "TF8LOCALE"))
965 sv_setuv(sv, (UV) PL_utf8locale);
966 else if (strEQ(remaining, "TF8CACHE"))
967 sv_setiv(sv, (IV) PL_utf8cache);
969 case '\027': /* ^W & $^WARNING_BITS */
970 if (nextchar == '\0')
971 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
972 else if (strEQ(remaining, "ARNING_BITS")) {
973 if (PL_compiling.cop_warnings == pWARN_NONE) {
974 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
976 else if (PL_compiling.cop_warnings == pWARN_STD) {
979 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
983 else if (PL_compiling.cop_warnings == pWARN_ALL) {
984 /* Get the bit mask for $warnings::Bits{all}, because
985 * it could have been extended by warnings::register */
986 HV * const bits=get_hv("warnings::Bits", 0);
988 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
990 sv_setsv(sv, *bits_all);
993 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
997 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
998 *PL_compiling.cop_warnings);
1003 case '\015': /* $^MATCH */
1004 if (strEQ(remaining, "ATCH")) {
1005 case '1': case '2': case '3': case '4':
1006 case '5': case '6': case '7': case '8': case '9': case '&':
1007 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1009 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
1010 * XXX Does the new way break anything?
1012 paren = atoi(mg->mg_ptr); /* $& is in [0] */
1013 CALLREG_NUMBUF_FETCH(rx,paren,sv);
1016 sv_setsv(sv,&PL_sv_undef);
1020 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1021 if (RX_LASTPAREN(rx)) {
1022 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
1026 sv_setsv(sv,&PL_sv_undef);
1028 case '\016': /* ^N */
1029 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1030 if (RX_LASTCLOSEPAREN(rx)) {
1031 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
1036 sv_setsv(sv,&PL_sv_undef);
1040 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1041 CALLREG_NUMBUF_FETCH(rx,-2,sv);
1044 sv_setsv(sv,&PL_sv_undef);
1048 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1049 CALLREG_NUMBUF_FETCH(rx,-1,sv);
1052 sv_setsv(sv,&PL_sv_undef);
1055 if (GvIO(PL_last_in_gv)) {
1056 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1061 sv_setiv(sv, (IV)STATUS_CURRENT);
1062 #ifdef COMPLEX_STATUS
1063 SvUPGRADE(sv, SVt_PVLV);
1064 LvTARGOFF(sv) = PL_statusvalue;
1065 LvTARGLEN(sv) = PL_statusvalue_vms;
1070 if (!isGV_with_GP(PL_defoutgv))
1072 else if (GvIOp(PL_defoutgv))
1073 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1077 sv_setpv(sv,GvENAME(PL_defoutgv));
1078 sv_catpvs(sv,"_TOP");
1082 if (!isGV_with_GP(PL_defoutgv))
1084 else if (GvIOp(PL_defoutgv))
1085 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1087 s = GvENAME(PL_defoutgv);
1091 if (GvIO(PL_defoutgv))
1092 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1095 if (GvIO(PL_defoutgv))
1096 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1099 if (GvIO(PL_defoutgv))
1100 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1107 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1110 if (GvIO(PL_defoutgv))
1111 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1115 sv_copypv(sv, PL_ors_sv);
1121 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1123 sv_setnv(sv, (NV)errno);
1126 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1127 sv_setpv(sv, os2error(Perl_rc));
1130 sv_setpv(sv, errno ? Strerror(errno) : "");
1132 SvPOK_on(sv); /* may have got removed during taint processing */
1137 SvNOK_on(sv); /* what a wonderful hack! */
1140 sv_setiv(sv, (IV)PL_uid);
1143 sv_setiv(sv, (IV)PL_euid);
1146 sv_setiv(sv, (IV)PL_gid);
1149 sv_setiv(sv, (IV)PL_egid);
1151 #ifdef HAS_GETGROUPS
1153 Groups_t *gary = NULL;
1154 I32 i, num_groups = getgroups(0, gary);
1155 Newx(gary, num_groups, Groups_t);
1156 num_groups = getgroups(num_groups, gary);
1157 for (i = 0; i < num_groups; i++)
1158 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1161 (void)SvIOK_on(sv); /* what a wonderful hack! */
1171 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1173 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1175 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1177 if (uf && uf->uf_val)
1178 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1183 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1186 STRLEN len = 0, klen;
1187 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1188 const char * const ptr = MgPV_const(mg,klen);
1191 PERL_ARGS_ASSERT_MAGIC_SETENV;
1193 #ifdef DYNAMIC_ENV_FETCH
1194 /* We just undefd an environment var. Is a replacement */
1195 /* waiting in the wings? */
1197 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1199 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1203 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1204 /* And you'll never guess what the dog had */
1205 /* in its mouth... */
1207 MgTAINTEDDIR_off(mg);
1209 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1210 char pathbuf[256], eltbuf[256], *cp, *elt;
1213 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1215 do { /* DCL$PATH may be a search list */
1216 while (1) { /* as may dev portion of any element */
1217 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1218 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1219 cando_by_name(S_IWUSR,0,elt) ) {
1220 MgTAINTEDDIR_on(mg);
1224 if ((cp = strchr(elt, ':')) != NULL)
1226 if (my_trnlnm(elt, eltbuf, j++))
1232 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1235 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1236 const char * const strend = s + len;
1238 while (s < strend) {
1242 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1243 const char path_sep = '|';
1245 const char path_sep = ':';
1247 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1248 s, strend, path_sep, &i);
1250 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1252 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1254 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1256 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1257 MgTAINTEDDIR_on(mg);
1263 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1269 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1271 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1272 PERL_UNUSED_ARG(sv);
1273 my_setenv(MgPV_nolen_const(mg),NULL);
1278 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1281 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1282 PERL_UNUSED_ARG(mg);
1284 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1286 if (PL_localizing) {
1289 hv_iterinit(MUTABLE_HV(sv));
1290 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1292 my_setenv(hv_iterkey(entry, &keylen),
1293 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1301 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1304 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1305 PERL_UNUSED_ARG(sv);
1306 PERL_UNUSED_ARG(mg);
1308 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1316 #ifdef HAS_SIGPROCMASK
1318 restore_sigmask(pTHX_ SV *save_sv)
1320 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1321 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1325 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1328 /* Are we fetching a signal entry? */
1329 int i = (I16)mg->mg_private;
1331 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1334 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1339 sv_setsv(sv,PL_psig_ptr[i]);
1341 Sighandler_t sigstate = rsignal_state(i);
1342 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1343 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1346 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1347 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1350 /* cache state so we don't fetch it again */
1351 if(sigstate == (Sighandler_t) SIG_IGN)
1352 sv_setpvs(sv,"IGNORE");
1354 sv_setsv(sv,&PL_sv_undef);
1355 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1362 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1364 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1366 magic_setsig(NULL, mg);
1367 return sv_unmagic(sv, mg->mg_type);
1371 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1372 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1374 Perl_csighandler(int sig)
1377 #ifdef PERL_GET_SIG_CONTEXT
1378 dTHXa(PERL_GET_SIG_CONTEXT);
1382 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1383 (void) rsignal(sig, PL_csighandlerp);
1384 if (PL_sig_ignoring[sig]) return;
1386 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1387 if (PL_sig_defaulting[sig])
1388 #ifdef KILL_BY_SIGPRC
1389 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1404 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1405 /* Call the perl level handler now--
1406 * with risk we may be in malloc() or being destructed etc. */
1407 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1408 (*PL_sighandlerp)(sig, NULL, NULL);
1410 (*PL_sighandlerp)(sig);
1413 if (!PL_psig_pend) return;
1414 /* Set a flag to say this signal is pending, that is awaiting delivery after
1415 * the current Perl opcode completes */
1416 PL_psig_pend[sig]++;
1418 #ifndef SIG_PENDING_DIE_COUNT
1419 # define SIG_PENDING_DIE_COUNT 120
1421 /* Add one to say _a_ signal is pending */
1422 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1423 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1424 (unsigned long)SIG_PENDING_DIE_COUNT);
1428 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1430 Perl_csighandler_init(void)
1433 if (PL_sig_handlers_initted) return;
1435 for (sig = 1; sig < SIG_SIZE; sig++) {
1436 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1438 PL_sig_defaulting[sig] = 1;
1439 (void) rsignal(sig, PL_csighandlerp);
1441 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1442 PL_sig_ignoring[sig] = 0;
1445 PL_sig_handlers_initted = 1;
1449 #if defined HAS_SIGPROCMASK
1451 unblock_sigmask(pTHX_ void* newset)
1453 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1458 Perl_despatch_signals(pTHX)
1463 for (sig = 1; sig < SIG_SIZE; sig++) {
1464 if (PL_psig_pend[sig]) {
1466 #ifdef HAS_SIGPROCMASK
1467 /* From sigaction(2) (FreeBSD man page):
1468 * | Signal routines normally execute with the signal that
1469 * | caused their invocation blocked, but other signals may
1471 * Emulation of this behavior (from within Perl) is enabled
1475 sigset_t newset, oldset;
1477 sigemptyset(&newset);
1478 sigaddset(&newset, sig);
1479 sigprocmask(SIG_BLOCK, &newset, &oldset);
1480 was_blocked = sigismember(&oldset, sig);
1482 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1484 SAVEFREESV(save_sv);
1485 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1488 PL_psig_pend[sig] = 0;
1489 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1490 (*PL_sighandlerp)(sig, NULL, NULL);
1492 (*PL_sighandlerp)(sig);
1494 #ifdef HAS_SIGPROCMASK
1503 /* sv of NULL signifies that we're acting as magic_clearsig. */
1505 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1510 /* Need to be careful with SvREFCNT_dec(), because that can have side
1511 * effects (due to closures). We must make sure that the new disposition
1512 * is in place before it is called.
1516 #ifdef HAS_SIGPROCMASK
1520 register const char *s = MgPV_const(mg,len);
1522 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1525 if (strEQ(s,"__DIE__"))
1527 else if (strEQ(s,"__WARN__")
1528 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1529 /* Merge the existing behaviours, which are as follows:
1530 magic_setsig, we always set svp to &PL_warnhook
1531 (hence we always change the warnings handler)
1532 For magic_clearsig, we don't change the warnings handler if it's
1533 set to the &PL_warnhook. */
1536 Perl_croak(aTHX_ "No such hook: %s", s);
1539 if (*svp != PERL_WARNHOOK_FATAL)
1545 i = (I16)mg->mg_private;
1547 i = whichsig(s); /* ...no, a brick */
1548 mg->mg_private = (U16)i;
1552 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1555 #ifdef HAS_SIGPROCMASK
1556 /* Avoid having the signal arrive at a bad time, if possible. */
1559 sigprocmask(SIG_BLOCK, &set, &save);
1561 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1562 SAVEFREESV(save_sv);
1563 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1566 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1567 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1569 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1570 PL_sig_ignoring[i] = 0;
1572 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1573 PL_sig_defaulting[i] = 0;
1575 to_dec = PL_psig_ptr[i];
1577 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1578 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1580 /* Signals don't change name during the program's execution, so once
1581 they're cached in the appropriate slot of PL_psig_name, they can
1584 Ideally we'd find some way of making SVs at (C) compile time, or
1585 at least, doing most of the work. */
1586 if (!PL_psig_name[i]) {
1587 PL_psig_name[i] = newSVpvn(s, len);
1588 SvREADONLY_on(PL_psig_name[i]);
1591 SvREFCNT_dec(PL_psig_name[i]);
1592 PL_psig_name[i] = NULL;
1593 PL_psig_ptr[i] = NULL;
1596 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1598 (void)rsignal(i, PL_csighandlerp);
1601 *svp = SvREFCNT_inc_simple_NN(sv);
1603 if (sv && SvOK(sv)) {
1604 s = SvPV_force(sv, len);
1608 if (sv && strEQ(s,"IGNORE")) {
1610 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1611 PL_sig_ignoring[i] = 1;
1612 (void)rsignal(i, PL_csighandlerp);
1614 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1618 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1620 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1621 PL_sig_defaulting[i] = 1;
1622 (void)rsignal(i, PL_csighandlerp);
1624 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1630 * We should warn if HINT_STRICT_REFS, but without
1631 * access to a known hint bit in a known OP, we can't
1632 * tell whether HINT_STRICT_REFS is in force or not.
1634 if (!strchr(s,':') && !strchr(s,'\''))
1635 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1638 (void)rsignal(i, PL_csighandlerp);
1640 *svp = SvREFCNT_inc_simple_NN(sv);
1644 #ifdef HAS_SIGPROCMASK
1648 SvREFCNT_dec(to_dec);
1651 #endif /* !PERL_MICRO */
1654 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1657 PERL_ARGS_ASSERT_MAGIC_SETISA;
1658 PERL_UNUSED_ARG(sv);
1660 /* Skip _isaelem because _isa will handle it shortly */
1661 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1664 return magic_clearisa(NULL, mg);
1667 /* sv of NULL signifies that we're acting as magic_setisa. */
1669 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1674 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1676 /* Bail out if destruction is going on */
1677 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1680 av_clear(MUTABLE_AV(sv));
1682 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1683 /* This occurs with setisa_elem magic, which calls this
1685 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1687 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1688 SV **svp = AvARRAY((AV *)mg->mg_obj);
1689 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1691 stash = GvSTASH((GV *)*svp++);
1692 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1699 (const GV *)mg->mg_obj
1702 /* The stash may have been detached from the symbol table, so check its
1703 name before doing anything. */
1704 if (stash && HvENAME_get(stash))
1705 mro_isa_changed_in(stash);
1711 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1714 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1715 PERL_UNUSED_ARG(sv);
1716 PERL_UNUSED_ARG(mg);
1717 PL_amagic_generation++;
1723 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1725 HV * const hv = MUTABLE_HV(LvTARG(sv));
1728 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1729 PERL_UNUSED_ARG(mg);
1732 (void) hv_iterinit(hv);
1733 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1736 while (hv_iternext(hv))
1741 sv_setiv(sv, (IV)i);
1746 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1748 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1749 PERL_UNUSED_ARG(mg);
1751 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1757 =for apidoc magic_methcall
1759 Invoke a magic method (like FETCH).
1761 * sv and mg are the tied thingy and the tie magic;
1762 * meth is the name of the method to call;
1763 * argc is the number of args (in addition to $self) to pass to the method;
1764 the args themselves are any values following the argc argument.
1766 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1767 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
1769 Returns the SV (if any) returned by the method, or NULL on failure.
1776 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1783 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1787 if (flags & G_WRITING_TO_STDERR) {
1791 SAVESPTR(PL_stderrgv);
1795 PUSHSTACKi(PERLSI_MAGIC);
1799 PUSHs(SvTIED_obj(sv, mg));
1800 if (flags & G_UNDEF_FILL) {
1802 PUSHs(&PL_sv_undef);
1804 } else if (argc > 0) {
1806 va_start(args, argc);
1809 SV *const sv = va_arg(args, SV *);
1816 if (flags & G_DISCARD) {
1817 call_method(meth, G_SCALAR|G_DISCARD);
1820 if (call_method(meth, G_SCALAR))
1821 ret = *PL_stack_sp--;
1824 if (flags & G_WRITING_TO_STDERR)
1831 /* wrapper for magic_methcall that creates the first arg */
1834 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1840 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1843 if (mg->mg_len >= 0) {
1844 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1846 else if (mg->mg_len == HEf_SVKEY)
1847 arg1 = MUTABLE_SV(mg->mg_ptr);
1849 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1850 arg1 = newSViv((IV)(mg->mg_len));
1854 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1856 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1860 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1865 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1867 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1874 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1876 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1878 if (mg->mg_type == PERL_MAGIC_tiedelem)
1879 mg->mg_flags |= MGf_GSKIP;
1880 magic_methpack(sv,mg,"FETCH");
1885 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1891 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1893 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1894 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1895 * public flags indicate its value based on copying from $val. Doing
1896 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1897 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1898 * wrong if $val happened to be tainted, as sv hasn't got magic
1899 * enabled, even though taint magic is in the chain. In which case,
1900 * fake up a temporary tainted value (this is easier than temporarily
1901 * re-enabling magic on sv). */
1903 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1904 && (tmg->mg_len & 1))
1906 val = sv_mortalcopy(sv);
1912 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1917 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1919 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1921 return magic_methpack(sv,mg,"DELETE");
1926 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1932 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1934 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1936 retval = SvIV(retsv)-1;
1938 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1940 return (U32) retval;
1944 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1948 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1950 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1955 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1960 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1962 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1963 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1970 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1972 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1974 return magic_methpack(sv,mg,"EXISTS");
1978 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1982 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1983 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1985 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1987 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1989 if (HvEITER_get(hv))
1990 /* we are in an iteration so the hash cannot be empty */
1992 /* no xhv_eiter so now use FIRSTKEY */
1993 key = sv_newmortal();
1994 magic_nextpack(MUTABLE_SV(hv), mg, key);
1995 HvEITER_set(hv, NULL); /* need to reset iterator */
1996 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1999 /* there is a SCALAR method that we can call */
2000 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
2002 retval = &PL_sv_undef;
2007 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2010 GV * const gv = PL_DBline;
2011 const I32 i = SvTRUE(sv);
2012 SV ** const svp = av_fetch(GvAV(gv),
2013 atoi(MgPV_nolen_const(mg)), FALSE);
2015 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2017 if (svp && SvIOKp(*svp)) {
2018 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2020 /* set or clear breakpoint in the relevant control op */
2022 o->op_flags |= OPf_SPECIAL;
2024 o->op_flags &= ~OPf_SPECIAL;
2031 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2034 AV * const obj = MUTABLE_AV(mg->mg_obj);
2036 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2039 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
2047 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2050 AV * const obj = MUTABLE_AV(mg->mg_obj);
2052 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2055 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
2057 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2058 "Attempt to set length of freed array");
2064 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2068 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2069 PERL_UNUSED_ARG(sv);
2071 /* during global destruction, mg_obj may already have been freed */
2072 if (PL_in_clean_all)
2075 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2078 /* arylen scalar holds a pointer back to the array, but doesn't own a
2079 reference. Hence the we (the array) are about to go away with it
2080 still pointing at us. Clear its pointer, else it would be pointing
2081 at free memory. See the comment in sv_magic about reference loops,
2082 and why it can't own a reference to us. */
2089 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2092 SV* const lsv = LvTARG(sv);
2094 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2095 PERL_UNUSED_ARG(mg);
2097 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2098 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2099 if (found && found->mg_len >= 0) {
2100 I32 i = found->mg_len;
2102 sv_pos_b2u(lsv, &i);
2103 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
2112 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2115 SV* const lsv = LvTARG(sv);
2121 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2122 PERL_UNUSED_ARG(mg);
2124 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2125 found = mg_find(lsv, PERL_MAGIC_regex_global);
2131 #ifdef PERL_OLD_COPY_ON_WRITE
2133 sv_force_normal_flags(lsv, 0);
2135 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2138 else if (!SvOK(sv)) {
2142 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2144 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2147 ulen = sv_len_utf8(lsv);
2157 else if (pos > (SSize_t)len)
2162 sv_pos_u2b(lsv, &p, 0);
2166 found->mg_len = pos;
2167 found->mg_flags &= ~MGf_MINMATCH;
2173 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2176 SV * const lsv = LvTARG(sv);
2177 const char * const tmps = SvPV_const(lsv,len);
2178 STRLEN offs = LvTARGOFF(sv);
2179 STRLEN rem = LvTARGLEN(sv);
2181 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2182 PERL_UNUSED_ARG(mg);
2185 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
2188 if (rem > len - offs)
2190 sv_setpvn(sv, tmps + offs, rem);
2197 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2201 const char * const tmps = SvPV_const(sv, len);
2202 SV * const lsv = LvTARG(sv);
2203 STRLEN lvoff = LvTARGOFF(sv);
2204 STRLEN lvlen = LvTARGLEN(sv);
2206 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2207 PERL_UNUSED_ARG(mg);
2210 sv_utf8_upgrade(lsv);
2211 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2212 sv_insert(lsv, lvoff, lvlen, tmps, len);
2213 LvTARGLEN(sv) = sv_len_utf8(sv);
2216 else if (lsv && SvUTF8(lsv)) {
2218 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2219 LvTARGLEN(sv) = len;
2220 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2221 sv_insert(lsv, lvoff, lvlen, utf8, len);
2225 sv_insert(lsv, lvoff, lvlen, tmps, len);
2226 LvTARGLEN(sv) = len;
2233 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2237 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2238 PERL_UNUSED_ARG(sv);
2240 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2245 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2249 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2250 PERL_UNUSED_ARG(sv);
2252 /* update taint status */
2261 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2263 SV * const lsv = LvTARG(sv);
2265 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2266 PERL_UNUSED_ARG(mg);
2269 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2277 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2279 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2280 PERL_UNUSED_ARG(mg);
2281 do_vecset(sv); /* XXX slurp this routine */
2286 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2291 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2293 if (LvTARGLEN(sv)) {
2295 SV * const ahv = LvTARG(sv);
2296 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2301 AV *const av = MUTABLE_AV(LvTARG(sv));
2302 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2303 targ = AvARRAY(av)[LvTARGOFF(sv)];
2305 if (targ && (targ != &PL_sv_undef)) {
2306 /* somebody else defined it for us */
2307 SvREFCNT_dec(LvTARG(sv));
2308 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2310 SvREFCNT_dec(mg->mg_obj);
2312 mg->mg_flags &= ~MGf_REFCOUNTED;
2317 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2322 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2324 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2325 PERL_UNUSED_ARG(mg);
2329 sv_setsv(LvTARG(sv), sv);
2330 SvSETMAGIC(LvTARG(sv));
2336 Perl_vivify_defelem(pTHX_ SV *sv)
2342 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2344 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2347 SV * const ahv = LvTARG(sv);
2348 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2351 if (!value || value == &PL_sv_undef)
2352 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2355 AV *const av = MUTABLE_AV(LvTARG(sv));
2356 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2357 LvTARG(sv) = NULL; /* array can't be extended */
2359 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2360 if (!svp || (value = *svp) == &PL_sv_undef)
2361 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2364 SvREFCNT_inc_simple_void(value);
2365 SvREFCNT_dec(LvTARG(sv));
2368 SvREFCNT_dec(mg->mg_obj);
2370 mg->mg_flags &= ~MGf_REFCOUNTED;
2374 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2376 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2377 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2382 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2384 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2385 PERL_UNUSED_CONTEXT;
2387 if (!isGV_with_GP(sv))
2393 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2395 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2397 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2399 if (uf && uf->uf_set)
2400 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2405 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2407 const char type = mg->mg_type;
2409 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2411 if (type == PERL_MAGIC_qr) {
2412 } else if (type == PERL_MAGIC_bm) {
2416 assert(type == PERL_MAGIC_fm);
2418 return sv_unmagic(sv, type);
2421 #ifdef USE_LOCALE_COLLATE
2423 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2425 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2428 * RenE<eacute> Descartes said "I think not."
2429 * and vanished with a faint plop.
2431 PERL_UNUSED_CONTEXT;
2432 PERL_UNUSED_ARG(sv);
2434 Safefree(mg->mg_ptr);
2440 #endif /* USE_LOCALE_COLLATE */
2442 /* Just clear the UTF-8 cache data. */
2444 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2446 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2447 PERL_UNUSED_CONTEXT;
2448 PERL_UNUSED_ARG(sv);
2449 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2451 mg->mg_len = -1; /* The mg_len holds the len cache. */
2456 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2459 register const char *s;
2461 register const REGEXP * rx;
2462 const char * const remaining = mg->mg_ptr + 1;
2467 PERL_ARGS_ASSERT_MAGIC_SET;
2469 switch (*mg->mg_ptr) {
2470 case '\015': /* $^MATCH */
2471 if (strEQ(remaining, "ATCH"))
2473 case '`': /* ${^PREMATCH} caught below */
2475 paren = RX_BUFF_IDX_PREMATCH;
2477 case '\'': /* ${^POSTMATCH} caught below */
2479 paren = RX_BUFF_IDX_POSTMATCH;
2483 paren = RX_BUFF_IDX_FULLMATCH;
2485 case '1': case '2': case '3': case '4':
2486 case '5': case '6': case '7': case '8': case '9':
2487 paren = atoi(mg->mg_ptr);
2489 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2490 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2492 /* Croak with a READONLY error when a numbered match var is
2493 * set without a previous pattern match. Unless it's C<local $1>
2495 if (!PL_localizing) {
2496 Perl_croak_no_modify(aTHX);
2500 case '\001': /* ^A */
2501 sv_setsv(PL_bodytarget, sv);
2502 /* mg_set() has temporarily made sv non-magical */
2504 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2505 SvTAINTED_on(PL_bodytarget);
2507 SvTAINTED_off(PL_bodytarget);
2510 case '\003': /* ^C */
2511 PL_minus_c = cBOOL(SvIV(sv));
2514 case '\004': /* ^D */
2516 s = SvPV_nolen_const(sv);
2517 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2518 if (DEBUG_x_TEST || DEBUG_B_TEST)
2519 dump_all_perl(!DEBUG_B_TEST);
2521 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2524 case '\005': /* ^E */
2525 if (*(mg->mg_ptr+1) == '\0') {
2527 set_vaxc_errno(SvIV(sv));
2530 SetLastError( SvIV(sv) );
2533 os2_setsyserrno(SvIV(sv));
2535 /* will anyone ever use this? */
2536 SETERRNO(SvIV(sv), 4);
2541 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2542 SvREFCNT_dec(PL_encoding);
2543 if (SvOK(sv) || SvGMAGICAL(sv)) {
2544 PL_encoding = newSVsv(sv);
2551 case '\006': /* ^F */
2552 PL_maxsysfd = SvIV(sv);
2554 case '\010': /* ^H */
2555 PL_hints = SvIV(sv);
2557 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2558 Safefree(PL_inplace);
2559 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2561 case '\017': /* ^O */
2562 if (*(mg->mg_ptr+1) == '\0') {
2563 Safefree(PL_osname);
2566 TAINT_PROPER("assigning to $^O");
2567 PL_osname = savesvpv(sv);
2570 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2572 const char *const start = SvPV(sv, len);
2573 const char *out = (const char*)memchr(start, '\0', len);
2577 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2578 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2580 /* Opening for input is more common than opening for output, so
2581 ensure that hints for input are sooner on linked list. */
2582 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2584 : newSVpvs_flags("", SvUTF8(sv));
2585 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2588 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2590 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2594 case '\020': /* ^P */
2595 if (*remaining == '\0') { /* ^P */
2596 PL_perldb = SvIV(sv);
2597 if (PL_perldb && !PL_DBsingle)
2600 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2602 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2606 case '\024': /* ^T */
2608 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2610 PL_basetime = (Time_t)SvIV(sv);
2613 case '\025': /* ^UTF8CACHE */
2614 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2615 PL_utf8cache = (signed char) sv_2iv(sv);
2618 case '\027': /* ^W & $^WARNING_BITS */
2619 if (*(mg->mg_ptr+1) == '\0') {
2620 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2622 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2623 | (i ? G_WARN_ON : G_WARN_OFF) ;
2626 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2627 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2628 if (!SvPOK(sv) && PL_localizing) {
2629 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2630 PL_compiling.cop_warnings = pWARN_NONE;
2635 int accumulate = 0 ;
2636 int any_fatals = 0 ;
2637 const char * const ptr = SvPV_const(sv, len) ;
2638 for (i = 0 ; i < len ; ++i) {
2639 accumulate |= ptr[i] ;
2640 any_fatals |= (ptr[i] & 0xAA) ;
2643 if (!specialWARN(PL_compiling.cop_warnings))
2644 PerlMemShared_free(PL_compiling.cop_warnings);
2645 PL_compiling.cop_warnings = pWARN_NONE;
2647 /* Yuck. I can't see how to abstract this: */
2648 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2649 WARN_ALL) && !any_fatals) {
2650 if (!specialWARN(PL_compiling.cop_warnings))
2651 PerlMemShared_free(PL_compiling.cop_warnings);
2652 PL_compiling.cop_warnings = pWARN_ALL;
2653 PL_dowarn |= G_WARN_ONCE ;
2657 const char *const p = SvPV_const(sv, len);
2659 PL_compiling.cop_warnings
2660 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2663 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2664 PL_dowarn |= G_WARN_ONCE ;
2672 if (PL_localizing) {
2673 if (PL_localizing == 1)
2674 SAVESPTR(PL_last_in_gv);
2676 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2677 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2680 if (isGV_with_GP(PL_defoutgv)) {
2681 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2682 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2683 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2687 if (isGV_with_GP(PL_defoutgv)) {
2688 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2689 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2690 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2694 if (isGV_with_GP(PL_defoutgv))
2695 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2698 if (isGV_with_GP(PL_defoutgv)) {
2699 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2700 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2701 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2705 if (isGV_with_GP(PL_defoutgv))
2706 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2710 IO * const io = GvIO(PL_defoutgv);
2713 if ((SvIV(sv)) == 0)
2714 IoFLAGS(io) &= ~IOf_FLUSH;
2716 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2717 PerlIO *ofp = IoOFP(io);
2719 (void)PerlIO_flush(ofp);
2720 IoFLAGS(io) |= IOf_FLUSH;
2726 SvREFCNT_dec(PL_rs);
2727 PL_rs = newSVsv(sv);
2730 SvREFCNT_dec(PL_ors_sv);
2731 if (SvOK(sv) || SvGMAGICAL(sv)) {
2732 PL_ors_sv = newSVsv(sv);
2739 CopARYBASE_set(&PL_compiling, SvIV(sv));
2742 #ifdef COMPLEX_STATUS
2743 if (PL_localizing == 2) {
2744 SvUPGRADE(sv, SVt_PVLV);
2745 PL_statusvalue = LvTARGOFF(sv);
2746 PL_statusvalue_vms = LvTARGLEN(sv);
2750 #ifdef VMSISH_STATUS
2752 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2755 STATUS_UNIX_EXIT_SET(SvIV(sv));
2760 # define PERL_VMS_BANG vaxc$errno
2762 # define PERL_VMS_BANG 0
2764 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2765 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2770 if (PL_delaymagic) {
2771 PL_delaymagic |= DM_RUID;
2772 break; /* don't do magic till later */
2775 (void)setruid((Uid_t)PL_uid);
2778 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2780 #ifdef HAS_SETRESUID
2781 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2783 if (PL_uid == PL_euid) { /* special case $< = $> */
2785 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2786 if (PL_uid != 0 && PerlProc_getuid() == 0)
2787 (void)PerlProc_setuid(0);
2789 (void)PerlProc_setuid(PL_uid);
2791 PL_uid = PerlProc_getuid();
2792 Perl_croak(aTHX_ "setruid() not implemented");
2797 PL_uid = PerlProc_getuid();
2801 if (PL_delaymagic) {
2802 PL_delaymagic |= DM_EUID;
2803 break; /* don't do magic till later */
2806 (void)seteuid((Uid_t)PL_euid);
2809 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2811 #ifdef HAS_SETRESUID
2812 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2814 if (PL_euid == PL_uid) /* special case $> = $< */
2815 PerlProc_setuid(PL_euid);
2817 PL_euid = PerlProc_geteuid();
2818 Perl_croak(aTHX_ "seteuid() not implemented");
2823 PL_euid = PerlProc_geteuid();
2827 if (PL_delaymagic) {
2828 PL_delaymagic |= DM_RGID;
2829 break; /* don't do magic till later */
2832 (void)setrgid((Gid_t)PL_gid);
2835 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2837 #ifdef HAS_SETRESGID
2838 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2840 if (PL_gid == PL_egid) /* special case $( = $) */
2841 (void)PerlProc_setgid(PL_gid);
2843 PL_gid = PerlProc_getgid();
2844 Perl_croak(aTHX_ "setrgid() not implemented");
2849 PL_gid = PerlProc_getgid();
2852 #ifdef HAS_SETGROUPS
2854 const char *p = SvPV_const(sv, len);
2855 Groups_t *gary = NULL;
2856 #ifdef _SC_NGROUPS_MAX
2857 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2862 int maxgrp = NGROUPS;
2868 for (i = 0; i < maxgrp; ++i) {
2869 while (*p && !isSPACE(*p))
2876 Newx(gary, i + 1, Groups_t);
2878 Renew(gary, i + 1, Groups_t);
2882 (void)setgroups(i, gary);
2885 #else /* HAS_SETGROUPS */
2887 #endif /* HAS_SETGROUPS */
2888 if (PL_delaymagic) {
2889 PL_delaymagic |= DM_EGID;
2890 break; /* don't do magic till later */
2893 (void)setegid((Gid_t)PL_egid);
2896 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2898 #ifdef HAS_SETRESGID
2899 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2901 if (PL_egid == PL_gid) /* special case $) = $( */
2902 (void)PerlProc_setgid(PL_egid);
2904 PL_egid = PerlProc_getegid();
2905 Perl_croak(aTHX_ "setegid() not implemented");
2910 PL_egid = PerlProc_getegid();
2913 PL_chopset = SvPV_force(sv,len);
2916 LOCK_DOLLARZERO_MUTEX;
2917 #ifdef HAS_SETPROCTITLE
2918 /* The BSDs don't show the argv[] in ps(1) output, they
2919 * show a string from the process struct and provide
2920 * the setproctitle() routine to manipulate that. */
2921 if (PL_origalen != 1) {
2922 s = SvPV_const(sv, len);
2923 # if __FreeBSD_version > 410001
2924 /* The leading "-" removes the "perl: " prefix,
2925 * but not the "(perl) suffix from the ps(1)
2926 * output, because that's what ps(1) shows if the
2927 * argv[] is modified. */
2928 setproctitle("-%s", s);
2929 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2930 /* This doesn't really work if you assume that
2931 * $0 = 'foobar'; will wipe out 'perl' from the $0
2932 * because in ps(1) output the result will be like
2933 * sprintf("perl: %s (perl)", s)
2934 * I guess this is a security feature:
2935 * one (a user process) cannot get rid of the original name.
2937 setproctitle("%s", s);
2940 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2941 if (PL_origalen != 1) {
2943 s = SvPV_const(sv, len);
2944 un.pst_command = (char *)s;
2945 pstat(PSTAT_SETCMD, un, len, 0, 0);
2948 if (PL_origalen > 1) {
2949 /* PL_origalen is set in perl_parse(). */
2950 s = SvPV_force(sv,len);
2951 if (len >= (STRLEN)PL_origalen-1) {
2952 /* Longer than original, will be truncated. We assume that
2953 * PL_origalen bytes are available. */
2954 Copy(s, PL_origargv[0], PL_origalen-1, char);
2957 /* Shorter than original, will be padded. */
2959 /* Special case for Mac OS X: see [perl #38868] */
2962 /* Is the space counterintuitive? Yes.
2963 * (You were expecting \0?)
2964 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2966 const int pad = ' ';
2968 Copy(s, PL_origargv[0], len, char);
2969 PL_origargv[0][len] = 0;
2970 memset(PL_origargv[0] + len + 1,
2971 pad, PL_origalen - len - 1);
2973 PL_origargv[0][PL_origalen-1] = 0;
2974 for (i = 1; i < PL_origargc; i++)
2976 #ifdef HAS_PRCTL_SET_NAME
2977 /* Set the legacy process name in addition to the POSIX name on Linux */
2978 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2979 /* diag_listed_as: SKIPME */
2980 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2985 UNLOCK_DOLLARZERO_MUTEX;
2992 Perl_whichsig(pTHX_ const char *sig)
2994 register char* const* sigv;
2996 PERL_ARGS_ASSERT_WHICHSIG;
2997 PERL_UNUSED_CONTEXT;
2999 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3000 if (strEQ(sig,*sigv))
3001 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3003 if (strEQ(sig,"CHLD"))
3007 if (strEQ(sig,"CLD"))
3014 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3015 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3017 Perl_sighandler(int sig)
3020 #ifdef PERL_GET_SIG_CONTEXT
3021 dTHXa(PERL_GET_SIG_CONTEXT);
3028 SV * const tSv = PL_Sv;
3032 XPV * const tXpv = PL_Xpv;
3033 I32 old_ss_ix = PL_savestack_ix;
3036 if (!PL_psig_ptr[sig]) {
3037 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3042 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3043 /* Max number of items pushed there is 3*n or 4. We cannot fix
3044 infinity, so we fix 4 (in fact 5): */
3045 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3047 PL_savestack_ix += 5; /* Protect save in progress. */
3048 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3051 /* sv_2cv is too complicated, try a simpler variant first: */
3052 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3053 || SvTYPE(cv) != SVt_PVCV) {
3055 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3058 if (!cv || !CvROOT(cv)) {
3059 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3060 PL_sig_name[sig], (gv ? GvENAME(gv)
3067 sv = PL_psig_name[sig]
3068 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3069 : newSVpv(PL_sig_name[sig],0);
3073 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3074 /* make sure our assumption about the size of the SAVEs are correct:
3075 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3076 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3079 PUSHSTACKi(PERLSI_SIGNAL);
3082 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3084 struct sigaction oact;
3086 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3089 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3090 /* The siginfo fields signo, code, errno, pid, uid,
3091 * addr, status, and band are defined by POSIX/SUSv3. */
3092 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3093 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3094 #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. */
3095 hv_stores(sih, "errno", newSViv(sip->si_errno));
3096 hv_stores(sih, "status", newSViv(sip->si_status));
3097 hv_stores(sih, "uid", newSViv(sip->si_uid));
3098 hv_stores(sih, "pid", newSViv(sip->si_pid));
3099 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3100 hv_stores(sih, "band", newSViv(sip->si_band));
3104 mPUSHp((char *)sip, sizeof(*sip));
3112 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3115 if (SvTRUE(ERRSV)) {
3117 /* Handler "died", for example to get out of a restart-able read().
3118 * Before we re-do that on its behalf re-enable the signal which was
3119 * blocked by the system when we entered.
3121 #ifdef HAS_SIGPROCMASK
3122 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3128 sigaddset(&set,sig);
3129 sigprocmask(SIG_UNBLOCK, &set, NULL);
3132 /* Not clear if this will work */
3133 (void)rsignal(sig, SIG_IGN);
3134 (void)rsignal(sig, PL_csighandlerp);
3136 #endif /* !PERL_MICRO */
3140 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3141 PL_savestack_ix = old_ss_ix;
3144 PL_op = myop; /* Apparently not needed... */
3146 PL_Sv = tSv; /* Restore global temporaries. */
3153 S_restore_magic(pTHX_ const void *p)
3156 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3157 SV* const sv = mgs->mgs_sv;
3163 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3165 #ifdef PERL_OLD_COPY_ON_WRITE
3166 /* While magic was saved (and off) sv_setsv may well have seen
3167 this SV as a prime candidate for COW. */
3169 sv_force_normal_flags(sv, 0);
3172 if (mgs->mgs_readonly)
3174 if (mgs->mgs_magical)
3175 SvFLAGS(sv) |= mgs->mgs_magical;
3178 if (SvGMAGICAL(sv)) {
3179 /* downgrade public flags to private,
3180 and discard any other private flags */
3182 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3184 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3185 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3190 bumped = mgs->mgs_bumped;
3191 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3193 /* If we're still on top of the stack, pop us off. (That condition
3194 * will be satisfied if restore_magic was called explicitly, but *not*
3195 * if it's being called via leave_scope.)
3196 * The reason for doing this is that otherwise, things like sv_2cv()
3197 * may leave alloc gunk on the savestack, and some code
3198 * (e.g. sighandler) doesn't expect that...
3200 if (PL_savestack_ix == mgs->mgs_ss_ix)
3202 UV popval = SSPOPUV;
3203 assert(popval == SAVEt_DESTRUCTOR_X);
3204 PL_savestack_ix -= 2;
3206 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3207 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3210 if (SvREFCNT(sv) == 1) {
3211 /* We hold the last reference to this SV, which implies that the
3212 SV was deleted as a side effect of the routines we called.
3213 So artificially keep it alive a bit longer.
3214 We avoid turning on the TEMP flag, which can cause the SV's
3215 buffer to get stolen (and maybe other stuff). */
3216 int was_temp = SvTEMP(sv);
3224 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
3228 /* clean up the mess created by Perl_sighandler().
3229 * Note that this is only called during an exit in a signal handler;
3230 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3234 S_unwind_handler_stack(pTHX_ const void *p)
3239 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3243 =for apidoc magic_sethint
3245 Triggered by a store to %^H, records the key/value pair to
3246 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3247 anything that would need a deep copy. Maybe we should warn if we find a
3253 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3256 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3257 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3259 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3261 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3262 an alternative leaf in there, with PL_compiling.cop_hints being used if
3263 it's NULL. If needed for threads, the alternative could lock a mutex,
3264 or take other more complex action. */
3266 /* Something changed in %^H, so it will need to be restored on scope exit.
3267 Doing this here saves a lot of doing it manually in perl code (and
3268 forgetting to do it, and consequent subtle errors. */
3269 PL_hints |= HINT_LOCALIZE_HH;
3270 CopHINTHASH_set(&PL_compiling,
3271 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3276 =for apidoc magic_clearhint
3278 Triggered by a delete from %^H, records the key to
3279 C<PL_compiling.cop_hints_hash>.
3284 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3288 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3289 PERL_UNUSED_ARG(sv);
3291 assert(mg->mg_len == HEf_SVKEY);
3293 PERL_UNUSED_ARG(sv);
3295 PL_hints |= HINT_LOCALIZE_HH;
3296 CopHINTHASH_set(&PL_compiling,
3297 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3298 MUTABLE_SV(mg->mg_ptr), 0, 0));
3303 =for apidoc magic_clearhints
3305 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3310 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3312 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3313 PERL_UNUSED_ARG(sv);
3314 PERL_UNUSED_ARG(mg);
3315 cophh_free(CopHINTHASH_get(&PL_compiling));
3316 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3322 * c-indentation-style: bsd
3324 * indent-tabs-mode: t
3327 * ex: set ts=8 sts=4 sw=4 noet: