3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
19 =head1 Magical Functions
21 "Magic" is special data attached to SV structures in order to give them
22 "magical" properties. When any Perl code tries to read from, or assign to,
23 an SV marked as magical, it calls the 'get' or 'set' function associated
24 with that SV's magic. A get is called prior to reading an SV, in order to
25 give it a chance to update its internal value (get on $. writes the line
26 number of the last read filehandle into to the SV's IV slot), while
27 set is called after an SV has been written to, in order to allow it to make
28 use of its changed value (set on $/ copies the SV's new value to the
29 PL_rs global variable).
31 Magic is implemented as a linked list of MAGIC structures attached to the
32 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33 of functions that implement the get(), set(), length() etc functions,
34 plus space for some flags and pointers. For example, a tied variable has
35 a MAGIC structure that contains a pointer to the object associated with the
44 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
50 #if defined(HAS_SETGROUPS)
57 # include <sys/pstat.h>
60 #ifdef HAS_PRCTL_SET_NAME
61 # include <sys/prctl.h>
64 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
65 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
67 Signal_t Perl_csighandler(int sig);
71 /* Missing protos on LynxOS */
72 void setruid(uid_t id);
73 void seteuid(uid_t id);
74 void setrgid(uid_t id);
75 void setegid(uid_t id);
79 * Pre-magic setup and post-magic takedown.
80 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
90 /* MGS is typedef'ed to struct magic_state in perl.h */
93 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
99 PERL_ARGS_ASSERT_SAVE_MAGIC;
101 assert(SvMAGICAL(sv));
103 /* we shouldn't really be called here with RC==0, but it can sometimes
104 * happen via mg_clear() (which also shouldn't be called when RC==0,
105 * but it can happen). Handle this case gracefully(ish) by not RC++
106 * and thus avoiding the resultant double free */
107 if (SvREFCNT(sv) > 0) {
108 /* guard against sv getting freed midway through the mg clearing,
109 * by holding a private reference for the duration. */
110 SvREFCNT_inc_simple_void_NN(sv);
114 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
116 mgs = SSPTR(mgs_ix, MGS*);
118 mgs->mgs_magical = SvMAGICAL(sv);
119 mgs->mgs_readonly = SvREADONLY(sv) && !SvIsCOW(sv);
120 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
121 mgs->mgs_bumped = bumped;
124 /* Turning READONLY off for a copy-on-write scalar (including shared
125 hash keys) is a bad idea. */
126 if (!SvIsCOW(sv)) SvREADONLY_off(sv);
130 =for apidoc mg_magical
132 Turns on the magical status of an SV. See C<sv_magic>.
138 Perl_mg_magical(pTHX_ SV *sv)
141 PERL_ARGS_ASSERT_MG_MAGICAL;
145 if ((mg = SvMAGIC(sv))) {
147 const MGVTBL* const vtbl = mg->mg_virtual;
149 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
156 } while ((mg = mg->mg_moremagic));
157 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
165 Do magic before a value is retrieved from the SV. The type of SV must
166 be >= SVt_PVMG. See C<sv_magic>.
172 Perl_mg_get(pTHX_ SV *sv)
175 const I32 mgs_ix = SSNEW(sizeof(MGS));
178 MAGIC *newmg, *head, *cur, *mg;
180 PERL_ARGS_ASSERT_MG_GET;
182 if (PL_localizing == 1 && sv == DEFSV) return 0;
184 /* We must call svt_get(sv, mg) for each valid entry in the linked
185 list of magic. svt_get() may delete the current entry, add new
186 magic to the head of the list, or upgrade the SV. AMS 20010810 */
188 newmg = cur = head = mg = SvMAGIC(sv);
190 const MGVTBL * const vtbl = mg->mg_virtual;
191 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
193 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
195 /* taint's mg get is so dumb it doesn't need flag saving */
196 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
197 save_magic(mgs_ix, sv);
201 vtbl->svt_get(aTHX_ sv, mg);
203 /* guard against magic having been deleted - eg FETCH calling
206 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
210 /* recalculate flags if this entry was deleted. */
211 if (mg->mg_flags & MGf_GSKIP)
212 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
214 else if (vtbl == &PL_vtbl_utf8) {
215 /* get-magic can reallocate the PV */
216 magic_setutf8(sv, mg);
222 /* Have we finished with the new entries we saw? Start again
223 where we left off (unless there are more new entries). */
231 /* Were any new entries added? */
232 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
241 restore_magic(INT2PTR(void *, (IV)mgs_ix));
249 Do magic after a value is assigned to the SV. See C<sv_magic>.
255 Perl_mg_set(pTHX_ SV *sv)
258 const I32 mgs_ix = SSNEW(sizeof(MGS));
262 PERL_ARGS_ASSERT_MG_SET;
264 if (PL_localizing == 2 && sv == DEFSV) return 0;
266 save_magic(mgs_ix, sv);
268 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
269 const MGVTBL* vtbl = mg->mg_virtual;
270 nextmg = mg->mg_moremagic; /* it may delete itself */
271 if (mg->mg_flags & MGf_GSKIP) {
272 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
273 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
275 if (PL_localizing == 2
276 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
278 if (vtbl && vtbl->svt_set)
279 vtbl->svt_set(aTHX_ sv, mg);
282 restore_magic(INT2PTR(void*, (IV)mgs_ix));
287 =for apidoc mg_length
289 Reports on the SV's length in bytes, calling length magic if available,
290 but does not set the UTF8 flag on the sv. It will fall back to 'get'
291 magic if there is no 'length' magic, but with no indication as to
292 whether it called 'get' magic. It assumes the sv is a PVMG or
293 higher. Use sv_len() instead.
299 Perl_mg_length(pTHX_ SV *sv)
305 PERL_ARGS_ASSERT_MG_LENGTH;
307 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
308 const MGVTBL * const vtbl = mg->mg_virtual;
309 if (vtbl && vtbl->svt_len) {
310 const I32 mgs_ix = SSNEW(sizeof(MGS));
311 save_magic(mgs_ix, sv);
312 /* omit MGf_GSKIP -- not changed here */
313 len = vtbl->svt_len(aTHX_ sv, mg);
314 restore_magic(INT2PTR(void*, (IV)mgs_ix));
319 (void)SvPV_const(sv, len);
324 Perl_mg_size(pTHX_ SV *sv)
328 PERL_ARGS_ASSERT_MG_SIZE;
330 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
331 const MGVTBL* const vtbl = mg->mg_virtual;
332 if (vtbl && vtbl->svt_len) {
333 const I32 mgs_ix = SSNEW(sizeof(MGS));
335 save_magic(mgs_ix, sv);
336 /* omit MGf_GSKIP -- not changed here */
337 len = vtbl->svt_len(aTHX_ sv, mg);
338 restore_magic(INT2PTR(void*, (IV)mgs_ix));
345 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
349 Perl_croak(aTHX_ "Size magic not implemented");
358 Clear something magical that the SV represents. See C<sv_magic>.
364 Perl_mg_clear(pTHX_ SV *sv)
366 const I32 mgs_ix = SSNEW(sizeof(MGS));
370 PERL_ARGS_ASSERT_MG_CLEAR;
372 save_magic(mgs_ix, sv);
374 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
375 const MGVTBL* const vtbl = mg->mg_virtual;
376 /* omit GSKIP -- never set here */
378 nextmg = mg->mg_moremagic; /* it may delete itself */
380 if (vtbl && vtbl->svt_clear)
381 vtbl->svt_clear(aTHX_ sv, mg);
384 restore_magic(INT2PTR(void*, (IV)mgs_ix));
389 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
398 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
399 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
411 Finds the magic pointer for type matching the SV. See C<sv_magic>.
417 Perl_mg_find(pTHX_ const SV *sv, int type)
419 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
423 =for apidoc mg_findext
425 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
432 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
434 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
440 Copies the magic from one SV to another. See C<sv_magic>.
446 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
451 PERL_ARGS_ASSERT_MG_COPY;
453 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
454 const MGVTBL* const vtbl = mg->mg_virtual;
455 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
456 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
459 const char type = mg->mg_type;
460 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
462 (type == PERL_MAGIC_tied)
464 : (type == PERL_MAGIC_regdata && mg->mg_obj)
467 toLOWER(type), key, klen);
476 =for apidoc mg_localize
478 Copy some of the magic from an existing SV to new localized version of that
479 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
482 If setmagic is false then no set magic will be called on the new (empty) SV.
483 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
484 and that will handle the magic.
490 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
495 PERL_ARGS_ASSERT_MG_LOCALIZE;
500 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
501 const MGVTBL* const vtbl = mg->mg_virtual;
502 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
505 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
506 (void)vtbl->svt_local(aTHX_ nsv, mg);
508 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
509 mg->mg_ptr, mg->mg_len);
511 /* container types should remain read-only across localization */
512 if (!SvIsCOW(sv)) SvFLAGS(nsv) |= SvREADONLY(sv);
515 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
516 SvFLAGS(nsv) |= SvMAGICAL(sv);
525 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
527 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
529 const MGVTBL* const vtbl = mg->mg_virtual;
530 if (vtbl && vtbl->svt_free)
531 vtbl->svt_free(aTHX_ sv, mg);
532 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
533 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
534 Safefree(mg->mg_ptr);
535 else if (mg->mg_len == HEf_SVKEY)
536 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
538 if (mg->mg_flags & MGf_REFCOUNTED)
539 SvREFCNT_dec(mg->mg_obj);
546 Free any magic storage used by the SV. See C<sv_magic>.
552 Perl_mg_free(pTHX_ SV *sv)
557 PERL_ARGS_ASSERT_MG_FREE;
559 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
560 moremagic = mg->mg_moremagic;
561 mg_free_struct(sv, mg);
562 SvMAGIC_set(sv, moremagic);
564 SvMAGIC_set(sv, NULL);
570 =for apidoc Am|void|mg_free_type|SV *sv|int how
572 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
578 Perl_mg_free_type(pTHX_ SV *sv, int how)
580 MAGIC *mg, *prevmg, *moremg;
581 PERL_ARGS_ASSERT_MG_FREE_TYPE;
582 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
584 moremg = mg->mg_moremagic;
585 if (mg->mg_type == how) {
586 /* temporarily move to the head of the magic chain, in case
587 custom free code relies on this historical aspect of mg_free */
589 prevmg->mg_moremagic = moremg;
590 mg->mg_moremagic = SvMAGIC(sv);
593 newhead = mg->mg_moremagic;
594 mg_free_struct(sv, mg);
595 SvMAGIC_set(sv, newhead);
605 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
610 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
613 const REGEXP * const rx = PM_GETRE(PL_curpm);
615 if (mg->mg_obj) { /* @+ */
616 /* return the number possible */
617 return RX_NPARENS(rx);
619 I32 paren = RX_LASTPAREN(rx);
621 /* return the last filled */
623 && (RX_OFFS(rx)[paren].start == -1
624 || RX_OFFS(rx)[paren].end == -1) )
637 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
641 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
644 const REGEXP * const rx = PM_GETRE(PL_curpm);
646 const I32 paren = mg->mg_len;
651 if (paren <= (I32)RX_NPARENS(rx) &&
652 (s = RX_OFFS(rx)[paren].start) != -1 &&
653 (t = RX_OFFS(rx)[paren].end) != -1)
656 if (mg->mg_obj) /* @+ */
661 if (i > 0 && RX_MATCH_UTF8(rx)) {
662 const char * const b = RX_SUBBEG(rx);
664 i = RX_SUBCOFFSET(rx) +
666 (U8*)(b-RX_SUBOFFSET(rx)+i));
679 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
681 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
684 Perl_croak_no_modify();
685 NORETURN_FUNCTION_END;
688 #define SvRTRIM(sv) STMT_START { \
690 STRLEN len = SvCUR(sv); \
691 char * const p = SvPVX(sv); \
692 while (len > 0 && isSPACE(p[len-1])) \
694 SvCUR_set(sv, len); \
700 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
702 PERL_ARGS_ASSERT_EMULATE_COP_IO;
704 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
705 sv_setsv(sv, &PL_sv_undef);
709 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
710 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
715 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
716 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
729 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
733 const char *s = NULL;
735 const char * const remaining = mg->mg_ptr + 1;
736 const char nextchar = *remaining;
738 PERL_ARGS_ASSERT_MAGIC_GET;
740 switch (*mg->mg_ptr) {
741 case '\001': /* ^A */
742 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
743 else sv_setsv(sv, &PL_sv_undef);
744 if (SvTAINTED(PL_bodytarget))
747 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
748 if (nextchar == '\0') {
749 sv_setiv(sv, (IV)PL_minus_c);
751 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
752 sv_setiv(sv, (IV)STATUS_NATIVE);
756 case '\004': /* ^D */
757 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
759 case '\005': /* ^E */
760 if (nextchar == '\0') {
764 $DESCRIPTOR(msgdsc,msg);
765 sv_setnv(sv,(NV) vaxc$errno);
766 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
767 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
772 if (!(_emx_env & 0x200)) { /* Under DOS */
773 sv_setnv(sv, (NV)errno);
774 sv_setpv(sv, errno ? Strerror(errno) : "");
776 if (errno != errno_isOS2) {
777 const int tmp = _syserrno();
778 if (tmp) /* 2nd call to _syserrno() makes it 0 */
781 sv_setnv(sv, (NV)Perl_rc);
782 sv_setpv(sv, os2error(Perl_rc));
786 const DWORD dwErr = GetLastError();
787 sv_setnv(sv, (NV)dwErr);
789 PerlProc_GetOSError(sv, dwErr);
798 sv_setnv(sv, (NV)errno);
799 sv_setpv(sv, errno ? Strerror(errno) : "");
804 SvNOK_on(sv); /* what a wonderful hack! */
806 else if (strEQ(remaining, "NCODING"))
807 sv_setsv(sv, PL_encoding);
809 case '\006': /* ^F */
810 sv_setiv(sv, (IV)PL_maxsysfd);
812 case '\007': /* ^GLOBAL_PHASE */
813 if (strEQ(remaining, "LOBAL_PHASE")) {
814 sv_setpvn(sv, PL_phase_names[PL_phase],
815 strlen(PL_phase_names[PL_phase]));
818 case '\010': /* ^H */
819 sv_setiv(sv, (IV)PL_hints);
821 case '\011': /* ^I */ /* NOT \t in EBCDIC */
822 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
824 case '\014': /* ^LAST_FH */
825 if (strEQ(remaining, "AST_FH")) {
827 assert(isGV_with_GP(PL_last_in_gv));
828 SV_CHECK_THINKFIRST_COW_DROP(sv);
829 prepare_SV_for_RV(sv);
831 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
835 else sv_setsv_nomg(sv, NULL);
838 case '\017': /* ^O & ^OPEN */
839 if (nextchar == '\0') {
840 sv_setpv(sv, PL_osname);
843 else if (strEQ(remaining, "PEN")) {
844 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
848 if (nextchar == '\0') { /* ^P */
849 sv_setiv(sv, (IV)PL_perldb);
850 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
852 paren = RX_BUFF_IDX_CARET_PREMATCH;
853 goto do_numbuf_fetch;
854 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
855 paren = RX_BUFF_IDX_CARET_POSTMATCH;
856 goto do_numbuf_fetch;
859 case '\023': /* ^S */
860 if (nextchar == '\0') {
861 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
864 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
869 case '\024': /* ^T */
870 if (nextchar == '\0') {
872 sv_setnv(sv, PL_basetime);
874 sv_setiv(sv, (IV)PL_basetime);
877 else if (strEQ(remaining, "AINT"))
878 sv_setiv(sv, TAINTING_get
879 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
882 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
883 if (strEQ(remaining, "NICODE"))
884 sv_setuv(sv, (UV) PL_unicode);
885 else if (strEQ(remaining, "TF8LOCALE"))
886 sv_setuv(sv, (UV) PL_utf8locale);
887 else if (strEQ(remaining, "TF8CACHE"))
888 sv_setiv(sv, (IV) PL_utf8cache);
890 case '\027': /* ^W & $^WARNING_BITS */
891 if (nextchar == '\0')
892 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
893 else if (strEQ(remaining, "ARNING_BITS")) {
894 if (PL_compiling.cop_warnings == pWARN_NONE) {
895 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
897 else if (PL_compiling.cop_warnings == pWARN_STD) {
898 sv_setsv(sv, &PL_sv_undef);
901 else if (PL_compiling.cop_warnings == pWARN_ALL) {
902 /* Get the bit mask for $warnings::Bits{all}, because
903 * it could have been extended by warnings::register */
904 HV * const bits = get_hv("warnings::Bits", 0);
905 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
907 sv_copypv(sv, *bits_all);
909 sv_setpvn(sv, WARN_ALLstring, WARNsize);
912 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
913 *PL_compiling.cop_warnings);
917 case '\015': /* $^MATCH */
918 if (strEQ(remaining, "ATCH")) {
919 paren = RX_BUFF_IDX_CARET_FULLMATCH;
920 goto do_numbuf_fetch;
923 case '1': case '2': case '3': case '4':
924 case '5': case '6': case '7': case '8': case '9': case '&':
926 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
927 * XXX Does the new way break anything?
929 paren = atoi(mg->mg_ptr); /* $& is in [0] */
931 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
932 CALLREG_NUMBUF_FETCH(rx,paren,sv);
935 sv_setsv(sv,&PL_sv_undef);
938 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
939 paren = RX_LASTPAREN(rx);
941 goto do_numbuf_fetch;
943 sv_setsv(sv,&PL_sv_undef);
945 case '\016': /* ^N */
946 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
947 paren = RX_LASTCLOSEPAREN(rx);
949 goto do_numbuf_fetch;
951 sv_setsv(sv,&PL_sv_undef);
954 paren = RX_BUFF_IDX_PREMATCH;
955 goto do_numbuf_fetch;
957 paren = RX_BUFF_IDX_POSTMATCH;
958 goto do_numbuf_fetch;
960 if (GvIO(PL_last_in_gv)) {
961 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
966 sv_setiv(sv, (IV)STATUS_CURRENT);
967 #ifdef COMPLEX_STATUS
968 SvUPGRADE(sv, SVt_PVLV);
969 LvTARGOFF(sv) = PL_statusvalue;
970 LvTARGLEN(sv) = PL_statusvalue_vms;
975 if (GvIOp(PL_defoutgv))
976 s = IoTOP_NAME(GvIOp(PL_defoutgv));
980 sv_setpv(sv,GvENAME(PL_defoutgv));
981 sv_catpvs(sv,"_TOP");
985 if (GvIOp(PL_defoutgv))
986 s = IoFMT_NAME(GvIOp(PL_defoutgv));
988 s = GvENAME(PL_defoutgv);
992 if (GvIO(PL_defoutgv))
993 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
996 if (GvIO(PL_defoutgv))
997 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1000 if (GvIO(PL_defoutgv))
1001 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1011 if (GvIO(PL_defoutgv))
1012 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1016 sv_copypv(sv, PL_ors_sv);
1018 sv_setsv(sv, &PL_sv_undef);
1022 IV const pid = (IV)PerlProc_getpid();
1023 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1024 /* never set manually, or at least not since last fork */
1026 /* never unsafe, even if reading in a tainted expression */
1029 /* else a value has been assigned manually, so do nothing */
1037 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1039 sv_setnv(sv, (NV)errno);
1042 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1043 sv_setpv(sv, os2error(Perl_rc));
1046 sv_setpv(sv, errno ? Strerror(errno) : "");
1051 SvNOK_on(sv); /* what a wonderful hack! */
1054 sv_setiv(sv, (IV)PerlProc_getuid());
1057 sv_setiv(sv, (IV)PerlProc_geteuid());
1060 sv_setiv(sv, (IV)PerlProc_getgid());
1063 sv_setiv(sv, (IV)PerlProc_getegid());
1065 #ifdef HAS_GETGROUPS
1067 Groups_t *gary = NULL;
1068 I32 i, num_groups = getgroups(0, gary);
1069 Newx(gary, num_groups, Groups_t);
1070 num_groups = getgroups(num_groups, gary);
1071 for (i = 0; i < num_groups; i++)
1072 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1075 (void)SvIOK_on(sv); /* what a wonderful hack! */
1085 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1087 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1089 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1091 if (uf && uf->uf_val)
1092 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1097 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1100 STRLEN len = 0, klen;
1101 const char * const key = MgPV_const(mg,klen);
1104 PERL_ARGS_ASSERT_MAGIC_SETENV;
1108 /* defined environment variables are byte strings; unfortunately
1109 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1110 (void)SvPV_force_nomg_nolen(sv);
1111 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1113 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1119 my_setenv(key, s); /* does the deed */
1121 #ifdef DYNAMIC_ENV_FETCH
1122 /* We just undefd an environment var. Is a replacement */
1123 /* waiting in the wings? */
1125 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1127 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1131 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1132 /* And you'll never guess what the dog had */
1133 /* in its mouth... */
1135 MgTAINTEDDIR_off(mg);
1137 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
1138 char pathbuf[256], eltbuf[256], *cp, *elt;
1141 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1143 do { /* DCL$PATH may be a search list */
1144 while (1) { /* as may dev portion of any element */
1145 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1146 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1147 cando_by_name(S_IWUSR,0,elt) ) {
1148 MgTAINTEDDIR_on(mg);
1152 if ((cp = strchr(elt, ':')) != NULL)
1154 if (my_trnlnm(elt, eltbuf, j++))
1160 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1163 if (s && klen == 4 && strEQ(key,"PATH")) {
1164 const char * const strend = s + len;
1166 while (s < strend) {
1170 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1171 const char path_sep = '|';
1173 const char path_sep = ':';
1175 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1176 s, strend, path_sep, &i);
1178 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1180 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1182 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1184 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1185 MgTAINTEDDIR_on(mg);
1191 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1197 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1199 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1200 PERL_UNUSED_ARG(sv);
1201 my_setenv(MgPV_nolen_const(mg),NULL);
1206 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1209 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1210 PERL_UNUSED_ARG(mg);
1212 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1214 if (PL_localizing) {
1217 hv_iterinit(MUTABLE_HV(sv));
1218 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1220 my_setenv(hv_iterkey(entry, &keylen),
1221 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1229 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1232 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1233 PERL_UNUSED_ARG(sv);
1234 PERL_UNUSED_ARG(mg);
1236 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1244 #ifdef HAS_SIGPROCMASK
1246 restore_sigmask(pTHX_ SV *save_sv)
1248 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1249 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1253 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1256 /* Are we fetching a signal entry? */
1257 int i = (I16)mg->mg_private;
1259 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1263 const char * sig = MgPV_const(mg, siglen);
1264 mg->mg_private = i = whichsig_pvn(sig, siglen);
1269 sv_setsv(sv,PL_psig_ptr[i]);
1271 Sighandler_t sigstate = rsignal_state(i);
1272 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1273 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1276 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1277 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1280 /* cache state so we don't fetch it again */
1281 if(sigstate == (Sighandler_t) SIG_IGN)
1282 sv_setpvs(sv,"IGNORE");
1284 sv_setsv(sv,&PL_sv_undef);
1285 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1292 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1294 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1296 magic_setsig(NULL, mg);
1297 return sv_unmagic(sv, mg->mg_type);
1301 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1302 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1304 Perl_csighandler(int sig)
1307 #ifdef PERL_GET_SIG_CONTEXT
1308 dTHXa(PERL_GET_SIG_CONTEXT);
1312 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1313 (void) rsignal(sig, PL_csighandlerp);
1314 if (PL_sig_ignoring[sig]) return;
1316 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1317 if (PL_sig_defaulting[sig])
1318 #ifdef KILL_BY_SIGPRC
1319 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1334 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1335 /* Call the perl level handler now--
1336 * with risk we may be in malloc() or being destructed etc. */
1337 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1338 (*PL_sighandlerp)(sig, NULL, NULL);
1340 (*PL_sighandlerp)(sig);
1343 if (!PL_psig_pend) return;
1344 /* Set a flag to say this signal is pending, that is awaiting delivery after
1345 * the current Perl opcode completes */
1346 PL_psig_pend[sig]++;
1348 #ifndef SIG_PENDING_DIE_COUNT
1349 # define SIG_PENDING_DIE_COUNT 120
1351 /* Add one to say _a_ signal is pending */
1352 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1353 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1354 (unsigned long)SIG_PENDING_DIE_COUNT);
1358 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1360 Perl_csighandler_init(void)
1363 if (PL_sig_handlers_initted) return;
1365 for (sig = 1; sig < SIG_SIZE; sig++) {
1366 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1368 PL_sig_defaulting[sig] = 1;
1369 (void) rsignal(sig, PL_csighandlerp);
1371 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1372 PL_sig_ignoring[sig] = 0;
1375 PL_sig_handlers_initted = 1;
1379 #if defined HAS_SIGPROCMASK
1381 unblock_sigmask(pTHX_ void* newset)
1383 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1388 Perl_despatch_signals(pTHX)
1393 for (sig = 1; sig < SIG_SIZE; sig++) {
1394 if (PL_psig_pend[sig]) {
1396 #ifdef HAS_SIGPROCMASK
1397 /* From sigaction(2) (FreeBSD man page):
1398 * | Signal routines normally execute with the signal that
1399 * | caused their invocation blocked, but other signals may
1401 * Emulation of this behavior (from within Perl) is enabled
1405 sigset_t newset, oldset;
1407 sigemptyset(&newset);
1408 sigaddset(&newset, sig);
1409 sigprocmask(SIG_BLOCK, &newset, &oldset);
1410 was_blocked = sigismember(&oldset, sig);
1412 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1414 SAVEFREESV(save_sv);
1415 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1418 PL_psig_pend[sig] = 0;
1419 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1420 (*PL_sighandlerp)(sig, NULL, NULL);
1422 (*PL_sighandlerp)(sig);
1424 #ifdef HAS_SIGPROCMASK
1433 /* sv of NULL signifies that we're acting as magic_clearsig. */
1435 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1440 /* Need to be careful with SvREFCNT_dec(), because that can have side
1441 * effects (due to closures). We must make sure that the new disposition
1442 * is in place before it is called.
1446 #ifdef HAS_SIGPROCMASK
1450 const char *s = MgPV_const(mg,len);
1452 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1455 if (memEQs(s, len, "__DIE__"))
1457 else if (memEQs(s, len, "__WARN__")
1458 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1459 /* Merge the existing behaviours, which are as follows:
1460 magic_setsig, we always set svp to &PL_warnhook
1461 (hence we always change the warnings handler)
1462 For magic_clearsig, we don't change the warnings handler if it's
1463 set to the &PL_warnhook. */
1466 SV *tmp = sv_newmortal();
1467 Perl_croak(aTHX_ "No such hook: %s",
1468 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1472 if (*svp != PERL_WARNHOOK_FATAL)
1478 i = (I16)mg->mg_private;
1480 i = whichsig_pvn(s, len); /* ...no, a brick */
1481 mg->mg_private = (U16)i;
1485 SV *tmp = sv_newmortal();
1486 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1487 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1491 #ifdef HAS_SIGPROCMASK
1492 /* Avoid having the signal arrive at a bad time, if possible. */
1495 sigprocmask(SIG_BLOCK, &set, &save);
1497 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1498 SAVEFREESV(save_sv);
1499 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1502 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1503 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1505 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1506 PL_sig_ignoring[i] = 0;
1508 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1509 PL_sig_defaulting[i] = 0;
1511 to_dec = PL_psig_ptr[i];
1513 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1514 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1516 /* Signals don't change name during the program's execution, so once
1517 they're cached in the appropriate slot of PL_psig_name, they can
1520 Ideally we'd find some way of making SVs at (C) compile time, or
1521 at least, doing most of the work. */
1522 if (!PL_psig_name[i]) {
1523 PL_psig_name[i] = newSVpvn(s, len);
1524 SvREADONLY_on(PL_psig_name[i]);
1527 SvREFCNT_dec(PL_psig_name[i]);
1528 PL_psig_name[i] = NULL;
1529 PL_psig_ptr[i] = NULL;
1532 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1534 (void)rsignal(i, PL_csighandlerp);
1537 *svp = SvREFCNT_inc_simple_NN(sv);
1539 if (sv && SvOK(sv)) {
1540 s = SvPV_force(sv, len);
1544 if (sv && memEQs(s, len,"IGNORE")) {
1546 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1547 PL_sig_ignoring[i] = 1;
1548 (void)rsignal(i, PL_csighandlerp);
1550 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1554 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1556 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1557 PL_sig_defaulting[i] = 1;
1558 (void)rsignal(i, PL_csighandlerp);
1560 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1566 * We should warn if HINT_STRICT_REFS, but without
1567 * access to a known hint bit in a known OP, we can't
1568 * tell whether HINT_STRICT_REFS is in force or not.
1570 if (!strchr(s,':') && !strchr(s,'\''))
1571 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1574 (void)rsignal(i, PL_csighandlerp);
1576 *svp = SvREFCNT_inc_simple_NN(sv);
1580 #ifdef HAS_SIGPROCMASK
1584 SvREFCNT_dec(to_dec);
1587 #endif /* !PERL_MICRO */
1590 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1593 PERL_ARGS_ASSERT_MAGIC_SETISA;
1594 PERL_UNUSED_ARG(sv);
1596 /* Skip _isaelem because _isa will handle it shortly */
1597 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1600 return magic_clearisa(NULL, mg);
1603 /* sv of NULL signifies that we're acting as magic_setisa. */
1605 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1610 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1612 /* Bail out if destruction is going on */
1613 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1616 av_clear(MUTABLE_AV(sv));
1618 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1619 /* This occurs with setisa_elem magic, which calls this
1621 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1623 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1624 SV **svp = AvARRAY((AV *)mg->mg_obj);
1625 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1627 stash = GvSTASH((GV *)*svp++);
1628 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1635 (const GV *)mg->mg_obj
1638 /* The stash may have been detached from the symbol table, so check its
1639 name before doing anything. */
1640 if (stash && HvENAME_get(stash))
1641 mro_isa_changed_in(stash);
1647 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1649 HV * const hv = MUTABLE_HV(LvTARG(sv));
1652 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1653 PERL_UNUSED_ARG(mg);
1656 (void) hv_iterinit(hv);
1657 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1660 while (hv_iternext(hv))
1665 sv_setiv(sv, (IV)i);
1670 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1672 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1673 PERL_UNUSED_ARG(mg);
1675 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1681 =for apidoc magic_methcall
1683 Invoke a magic method (like FETCH).
1685 C<sv> and C<mg> are the tied thingy and the tie magic.
1687 C<meth> is the name of the method to call.
1689 C<argc> is the number of args (in addition to $self) to pass to the method.
1691 The C<flags> can be:
1693 G_DISCARD invoke method with G_DISCARD flag and don't
1695 G_UNDEF_FILL fill the stack with argc pointers to
1698 The arguments themselves are any values following the C<flags> argument.
1700 Returns the SV (if any) returned by the method, or NULL on failure.
1707 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1714 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1718 if (flags & G_WRITING_TO_STDERR) {
1722 SAVESPTR(PL_stderrgv);
1726 PUSHSTACKi(PERLSI_MAGIC);
1730 PUSHs(SvTIED_obj(sv, mg));
1731 if (flags & G_UNDEF_FILL) {
1733 PUSHs(&PL_sv_undef);
1735 } else if (argc > 0) {
1737 va_start(args, argc);
1740 SV *const sv = va_arg(args, SV *);
1747 if (flags & G_DISCARD) {
1748 call_method(meth, G_SCALAR|G_DISCARD);
1751 if (call_method(meth, G_SCALAR))
1752 ret = *PL_stack_sp--;
1755 if (flags & G_WRITING_TO_STDERR)
1762 /* wrapper for magic_methcall that creates the first arg */
1765 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1771 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1774 if (mg->mg_len >= 0) {
1775 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1777 else if (mg->mg_len == HEf_SVKEY)
1778 arg1 = MUTABLE_SV(mg->mg_ptr);
1780 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1781 arg1 = newSViv((IV)(mg->mg_len));
1785 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1787 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1791 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1796 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1798 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1805 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1807 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1809 if (mg->mg_type == PERL_MAGIC_tiedelem)
1810 mg->mg_flags |= MGf_GSKIP;
1811 magic_methpack(sv,mg,"FETCH");
1816 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1822 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1824 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1825 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1826 * public flags indicate its value based on copying from $val. Doing
1827 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1828 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1829 * wrong if $val happened to be tainted, as sv hasn't got magic
1830 * enabled, even though taint magic is in the chain. In which case,
1831 * fake up a temporary tainted value (this is easier than temporarily
1832 * re-enabling magic on sv). */
1834 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
1835 && (tmg->mg_len & 1))
1837 val = sv_mortalcopy(sv);
1843 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1848 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1850 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1852 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
1853 return magic_methpack(sv,mg,"DELETE");
1858 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1864 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1866 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1868 retval = SvIV(retsv)-1;
1870 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1872 return (U32) retval;
1876 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1880 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1882 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1887 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1892 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1894 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1895 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1902 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1904 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1906 return magic_methpack(sv,mg,"EXISTS");
1910 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1914 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1915 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1917 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1919 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1921 if (HvEITER_get(hv))
1922 /* we are in an iteration so the hash cannot be empty */
1924 /* no xhv_eiter so now use FIRSTKEY */
1925 key = sv_newmortal();
1926 magic_nextpack(MUTABLE_SV(hv), mg, key);
1927 HvEITER_set(hv, NULL); /* need to reset iterator */
1928 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1931 /* there is a SCALAR method that we can call */
1932 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
1934 retval = &PL_sv_undef;
1939 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1942 GV * const gv = PL_DBline;
1943 const I32 i = SvTRUE(sv);
1944 SV ** const svp = av_fetch(GvAV(gv),
1945 atoi(MgPV_nolen_const(mg)), FALSE);
1947 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1949 if (svp && SvIOKp(*svp)) {
1950 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1952 #ifdef PERL_DEBUG_READONLY_OPS
1953 Slab_to_rw(OpSLAB(o));
1955 /* set or clear breakpoint in the relevant control op */
1957 o->op_flags |= OPf_SPECIAL;
1959 o->op_flags &= ~OPf_SPECIAL;
1960 #ifdef PERL_DEBUG_READONLY_OPS
1961 Slab_to_ro(OpSLAB(o));
1969 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1972 AV * const obj = MUTABLE_AV(mg->mg_obj);
1974 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1977 sv_setiv(sv, AvFILL(obj));
1985 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1988 AV * const obj = MUTABLE_AV(mg->mg_obj);
1990 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1993 av_fill(obj, SvIV(sv));
1995 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
1996 "Attempt to set length of freed array");
2002 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2006 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2007 PERL_UNUSED_ARG(sv);
2009 /* Reset the iterator when the array is cleared */
2010 #if IVSIZE == I32SIZE
2011 *((IV *) &(mg->mg_len)) = 0;
2014 *((IV *) mg->mg_ptr) = 0;
2021 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2025 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2026 PERL_UNUSED_ARG(sv);
2028 /* during global destruction, mg_obj may already have been freed */
2029 if (PL_in_clean_all)
2032 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2035 /* arylen scalar holds a pointer back to the array, but doesn't own a
2036 reference. Hence the we (the array) are about to go away with it
2037 still pointing at us. Clear its pointer, else it would be pointing
2038 at free memory. See the comment in sv_magic about reference loops,
2039 and why it can't own a reference to us. */
2046 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2049 SV* const lsv = LvTARG(sv);
2051 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2052 PERL_UNUSED_ARG(mg);
2054 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2055 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2056 if (found && found->mg_len >= 0) {
2057 I32 i = found->mg_len;
2059 sv_pos_b2u(lsv, &i);
2069 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2072 SV* const lsv = LvTARG(sv);
2079 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2080 PERL_UNUSED_ARG(mg);
2082 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2083 found = mg_find(lsv, PERL_MAGIC_regex_global);
2089 #ifdef PERL_OLD_COPY_ON_WRITE
2091 sv_force_normal_flags(lsv, 0);
2093 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2096 else if (!SvOK(sv)) {
2100 s = SvPV_const(lsv, len);
2105 ulen = sv_or_pv_len_utf8(lsv, s, len);
2115 else if (pos > (SSize_t)len)
2119 pos = sv_or_pv_pos_u2b(lsv, s, pos, 0);
2122 found->mg_len = pos;
2123 found->mg_flags &= ~MGf_MINMATCH;
2129 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2132 SV * const lsv = LvTARG(sv);
2133 const char * const tmps = SvPV_const(lsv,len);
2134 STRLEN offs = LvTARGOFF(sv);
2135 STRLEN rem = LvTARGLEN(sv);
2136 const bool negoff = LvFLAGS(sv) & 1;
2137 const bool negrem = LvFLAGS(sv) & 2;
2139 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2140 PERL_UNUSED_ARG(mg);
2142 if (!translate_substr_offsets(
2143 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2144 negoff ? -(IV)offs : (IV)offs, !negoff,
2145 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2147 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2148 sv_setsv_nomg(sv, &PL_sv_undef);
2153 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2154 sv_setpvn(sv, tmps + offs, rem);
2161 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2164 STRLEN len, lsv_len, oldtarglen, newtarglen;
2165 const char * const tmps = SvPV_const(sv, len);
2166 SV * const lsv = LvTARG(sv);
2167 STRLEN lvoff = LvTARGOFF(sv);
2168 STRLEN lvlen = LvTARGLEN(sv);
2169 const bool negoff = LvFLAGS(sv) & 1;
2170 const bool neglen = LvFLAGS(sv) & 2;
2172 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2173 PERL_UNUSED_ARG(mg);
2177 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2178 "Attempt to use reference as lvalue in substr"
2180 SvPV_force_nomg(lsv,lsv_len);
2181 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2182 if (!translate_substr_offsets(
2184 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2185 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2187 Perl_croak(aTHX_ "substr outside of string");
2190 sv_utf8_upgrade_nomg(lsv);
2191 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2192 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2193 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2196 else if (SvUTF8(lsv)) {
2198 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2200 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2201 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2205 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2208 if (!neglen) LvTARGLEN(sv) = newtarglen;
2209 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2215 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2219 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2220 PERL_UNUSED_ARG(sv);
2221 #ifdef NO_TAINT_SUPPORT
2222 PERL_UNUSED_ARG(mg);
2225 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2230 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2234 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2235 PERL_UNUSED_ARG(sv);
2237 /* update taint status */
2246 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2248 SV * const lsv = LvTARG(sv);
2250 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2251 PERL_UNUSED_ARG(mg);
2254 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2262 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2264 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2265 PERL_UNUSED_ARG(mg);
2266 do_vecset(sv); /* XXX slurp this routine */
2271 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2276 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2278 if (LvTARGLEN(sv)) {
2280 SV * const ahv = LvTARG(sv);
2281 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2286 AV *const av = MUTABLE_AV(LvTARG(sv));
2287 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2288 targ = AvARRAY(av)[LvTARGOFF(sv)];
2290 if (targ && (targ != &PL_sv_undef)) {
2291 /* somebody else defined it for us */
2292 SvREFCNT_dec(LvTARG(sv));
2293 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2295 SvREFCNT_dec(mg->mg_obj);
2297 mg->mg_flags &= ~MGf_REFCOUNTED;
2302 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2307 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2309 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2310 PERL_UNUSED_ARG(mg);
2314 sv_setsv(LvTARG(sv), sv);
2315 SvSETMAGIC(LvTARG(sv));
2321 Perl_vivify_defelem(pTHX_ SV *sv)
2327 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2329 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2332 SV * const ahv = LvTARG(sv);
2333 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2336 if (!value || value == &PL_sv_undef)
2337 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2340 AV *const av = MUTABLE_AV(LvTARG(sv));
2341 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2342 LvTARG(sv) = NULL; /* array can't be extended */
2344 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2345 if (!svp || (value = *svp) == &PL_sv_undef)
2346 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2349 SvREFCNT_inc_simple_void(value);
2350 SvREFCNT_dec(LvTARG(sv));
2353 SvREFCNT_dec(mg->mg_obj);
2355 mg->mg_flags &= ~MGf_REFCOUNTED;
2359 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2361 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2362 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2367 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2369 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2370 PERL_UNUSED_CONTEXT;
2371 PERL_UNUSED_ARG(sv);
2377 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2379 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2381 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2383 if (uf && uf->uf_set)
2384 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2389 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2391 const char type = mg->mg_type;
2393 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2395 if (type == PERL_MAGIC_qr) {
2396 } else if (type == PERL_MAGIC_bm) {
2400 assert(type == PERL_MAGIC_fm);
2402 return sv_unmagic(sv, type);
2405 #ifdef USE_LOCALE_COLLATE
2407 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2409 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2412 * RenE<eacute> Descartes said "I think not."
2413 * and vanished with a faint plop.
2415 PERL_UNUSED_CONTEXT;
2416 PERL_UNUSED_ARG(sv);
2418 Safefree(mg->mg_ptr);
2424 #endif /* USE_LOCALE_COLLATE */
2426 /* Just clear the UTF-8 cache data. */
2428 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2430 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2431 PERL_UNUSED_CONTEXT;
2432 PERL_UNUSED_ARG(sv);
2433 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2435 mg->mg_len = -1; /* The mg_len holds the len cache. */
2440 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2446 const char * const remaining = mg->mg_ptr + 1;
2451 PERL_ARGS_ASSERT_MAGIC_SET;
2453 switch (*mg->mg_ptr) {
2454 case '\015': /* $^MATCH */
2455 if (strEQ(remaining, "ATCH"))
2457 case '`': /* ${^PREMATCH} caught below */
2459 paren = RX_BUFF_IDX_PREMATCH;
2461 case '\'': /* ${^POSTMATCH} caught below */
2463 paren = RX_BUFF_IDX_POSTMATCH;
2467 paren = RX_BUFF_IDX_FULLMATCH;
2469 case '1': case '2': case '3': case '4':
2470 case '5': case '6': case '7': case '8': case '9':
2471 paren = atoi(mg->mg_ptr);
2473 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2475 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2477 /* Croak with a READONLY error when a numbered match var is
2478 * set without a previous pattern match. Unless it's C<local $1>
2481 if (!PL_localizing) {
2482 Perl_croak_no_modify();
2486 case '\001': /* ^A */
2487 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2488 else SvOK_off(PL_bodytarget);
2489 FmLINES(PL_bodytarget) = 0;
2490 if (SvPOK(PL_bodytarget)) {
2491 char *s = SvPVX(PL_bodytarget);
2492 while ( ((s = strchr(s, '\n'))) ) {
2493 FmLINES(PL_bodytarget)++;
2497 /* mg_set() has temporarily made sv non-magical */
2499 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2500 SvTAINTED_on(PL_bodytarget);
2502 SvTAINTED_off(PL_bodytarget);
2505 case '\003': /* ^C */
2506 PL_minus_c = cBOOL(SvIV(sv));
2509 case '\004': /* ^D */
2511 s = SvPV_nolen_const(sv);
2512 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2513 if (DEBUG_x_TEST || DEBUG_B_TEST)
2514 dump_all_perl(!DEBUG_B_TEST);
2516 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2519 case '\005': /* ^E */
2520 if (*(mg->mg_ptr+1) == '\0') {
2522 set_vaxc_errno(SvIV(sv));
2525 SetLastError( SvIV(sv) );
2528 os2_setsyserrno(SvIV(sv));
2530 /* will anyone ever use this? */
2531 SETERRNO(SvIV(sv), 4);
2536 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2537 SvREFCNT_dec(PL_encoding);
2538 if (SvOK(sv) || SvGMAGICAL(sv)) {
2539 PL_encoding = newSVsv(sv);
2546 case '\006': /* ^F */
2547 PL_maxsysfd = SvIV(sv);
2549 case '\010': /* ^H */
2550 PL_hints = SvIV(sv);
2552 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2553 Safefree(PL_inplace);
2554 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2556 case '\016': /* ^N */
2557 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2558 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2560 case '\017': /* ^O */
2561 if (*(mg->mg_ptr+1) == '\0') {
2562 Safefree(PL_osname);
2565 TAINT_PROPER("assigning to $^O");
2566 PL_osname = savesvpv(sv);
2569 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2571 const char *const start = SvPV(sv, len);
2572 const char *out = (const char*)memchr(start, '\0', len);
2576 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2577 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2579 /* Opening for input is more common than opening for output, so
2580 ensure that hints for input are sooner on linked list. */
2581 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2583 : newSVpvs_flags("", SvUTF8(sv));
2584 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2587 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2589 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2593 case '\020': /* ^P */
2594 if (*remaining == '\0') { /* ^P */
2595 PL_perldb = SvIV(sv);
2596 if (PL_perldb && !PL_DBsingle)
2599 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2601 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2605 case '\024': /* ^T */
2607 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2609 PL_basetime = (Time_t)SvIV(sv);
2612 case '\025': /* ^UTF8CACHE */
2613 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2614 PL_utf8cache = (signed char) sv_2iv(sv);
2617 case '\027': /* ^W & $^WARNING_BITS */
2618 if (*(mg->mg_ptr+1) == '\0') {
2619 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2621 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2622 | (i ? G_WARN_ON : G_WARN_OFF) ;
2625 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2626 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2628 PL_compiling.cop_warnings = pWARN_STD;
2633 int accumulate = 0 ;
2634 int any_fatals = 0 ;
2635 const char * const ptr = SvPV_const(sv, len) ;
2636 for (i = 0 ; i < len ; ++i) {
2637 accumulate |= ptr[i] ;
2638 any_fatals |= (ptr[i] & 0xAA) ;
2641 if (!specialWARN(PL_compiling.cop_warnings))
2642 PerlMemShared_free(PL_compiling.cop_warnings);
2643 PL_compiling.cop_warnings = pWARN_NONE;
2645 /* Yuck. I can't see how to abstract this: */
2647 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2651 if (!specialWARN(PL_compiling.cop_warnings))
2652 PerlMemShared_free(PL_compiling.cop_warnings);
2653 PL_compiling.cop_warnings = pWARN_ALL;
2654 PL_dowarn |= G_WARN_ONCE ;
2658 const char *const p = SvPV_const(sv, len);
2660 PL_compiling.cop_warnings
2661 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2664 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2665 PL_dowarn |= G_WARN_ONCE ;
2673 if (PL_localizing) {
2674 if (PL_localizing == 1)
2675 SAVESPTR(PL_last_in_gv);
2677 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2678 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
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);
2686 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2687 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2688 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2691 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2694 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2695 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2696 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2699 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2703 IO * const io = GvIO(PL_defoutgv);
2706 if ((SvIV(sv)) == 0)
2707 IoFLAGS(io) &= ~IOf_FLUSH;
2709 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2710 PerlIO *ofp = IoOFP(io);
2712 (void)PerlIO_flush(ofp);
2713 IoFLAGS(io) |= IOf_FLUSH;
2719 SvREFCNT_dec(PL_rs);
2720 PL_rs = newSVsv(sv);
2723 SvREFCNT_dec(PL_ors_sv);
2725 PL_ors_sv = newSVsv(sv);
2733 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2736 #ifdef COMPLEX_STATUS
2737 if (PL_localizing == 2) {
2738 SvUPGRADE(sv, SVt_PVLV);
2739 PL_statusvalue = LvTARGOFF(sv);
2740 PL_statusvalue_vms = LvTARGLEN(sv);
2744 #ifdef VMSISH_STATUS
2746 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2749 STATUS_UNIX_EXIT_SET(SvIV(sv));
2754 # define PERL_VMS_BANG vaxc$errno
2756 # define PERL_VMS_BANG 0
2758 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2759 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2764 const IV new_uid = SvIV(sv);
2765 PL_delaymagic_uid = new_uid;
2766 if (PL_delaymagic) {
2767 PL_delaymagic |= DM_RUID;
2768 break; /* don't do magic till later */
2771 (void)setruid((Uid_t)new_uid);
2774 (void)setreuid((Uid_t)new_uid, (Uid_t)-1);
2776 #ifdef HAS_SETRESUID
2777 (void)setresuid((Uid_t)new_uid, (Uid_t)-1, (Uid_t)-1);
2779 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2781 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2782 if (new_uid != 0 && PerlProc_getuid() == 0)
2783 (void)PerlProc_setuid(0);
2785 (void)PerlProc_setuid(new_uid);
2787 Perl_croak(aTHX_ "setruid() not implemented");
2796 const UV new_euid = SvIV(sv);
2797 PL_delaymagic_euid = new_euid;
2798 if (PL_delaymagic) {
2799 PL_delaymagic |= DM_EUID;
2800 break; /* don't do magic till later */
2803 (void)seteuid((Uid_t)new_euid);
2806 (void)setreuid((Uid_t)-1, (Uid_t)new_euid);
2808 #ifdef HAS_SETRESUID
2809 (void)setresuid((Uid_t)-1, (Uid_t)new_euid, (Uid_t)-1);
2811 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
2812 PerlProc_setuid(new_euid);
2814 Perl_croak(aTHX_ "seteuid() not implemented");
2823 const UV new_gid = SvIV(sv);
2824 PL_delaymagic_gid = new_gid;
2825 if (PL_delaymagic) {
2826 PL_delaymagic |= DM_RGID;
2827 break; /* don't do magic till later */
2830 (void)setrgid((Gid_t)new_gid);
2833 (void)setregid((Gid_t)new_gid, (Gid_t)-1);
2835 #ifdef HAS_SETRESGID
2836 (void)setresgid((Gid_t)new_gid, (Gid_t)-1, (Gid_t) -1);
2838 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
2839 (void)PerlProc_setgid(new_gid);
2841 Perl_croak(aTHX_ "setrgid() not implemented");
2851 #ifdef HAS_SETGROUPS
2853 const char *p = SvPV_const(sv, len);
2854 Groups_t *gary = NULL;
2855 #ifdef _SC_NGROUPS_MAX
2856 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2861 int maxgrp = NGROUPS;
2867 for (i = 0; i < maxgrp; ++i) {
2868 while (*p && !isSPACE(*p))
2875 Newx(gary, i + 1, Groups_t);
2877 Renew(gary, i + 1, Groups_t);
2881 (void)setgroups(i, gary);
2884 #else /* HAS_SETGROUPS */
2885 new_egid = SvIV(sv);
2886 #endif /* HAS_SETGROUPS */
2887 PL_delaymagic_egid = new_egid;
2888 if (PL_delaymagic) {
2889 PL_delaymagic |= DM_EGID;
2890 break; /* don't do magic till later */
2893 (void)setegid((Gid_t)new_egid);
2896 (void)setregid((Gid_t)-1, (Gid_t)new_egid);
2898 #ifdef HAS_SETRESGID
2899 (void)setresgid((Gid_t)-1, (Gid_t)new_egid, (Gid_t)-1);
2901 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
2902 (void)PerlProc_setgid(new_egid);
2904 Perl_croak(aTHX_ "setegid() not implemented");
2912 PL_chopset = SvPV_force(sv,len);
2915 /* Store the pid in mg->mg_obj so we can tell when a fork has
2916 occurred. mg->mg_obj points to *$ by default, so clear it. */
2917 if (isGV(mg->mg_obj)) {
2918 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2919 SvREFCNT_dec(mg->mg_obj);
2920 mg->mg_flags |= MGf_REFCOUNTED;
2921 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2923 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2926 LOCK_DOLLARZERO_MUTEX;
2927 #ifdef HAS_SETPROCTITLE
2928 /* The BSDs don't show the argv[] in ps(1) output, they
2929 * show a string from the process struct and provide
2930 * the setproctitle() routine to manipulate that. */
2931 if (PL_origalen != 1) {
2932 s = SvPV_const(sv, len);
2933 # if __FreeBSD_version > 410001
2934 /* The leading "-" removes the "perl: " prefix,
2935 * but not the "(perl) suffix from the ps(1)
2936 * output, because that's what ps(1) shows if the
2937 * argv[] is modified. */
2938 setproctitle("-%s", s);
2939 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2940 /* This doesn't really work if you assume that
2941 * $0 = 'foobar'; will wipe out 'perl' from the $0
2942 * because in ps(1) output the result will be like
2943 * sprintf("perl: %s (perl)", s)
2944 * I guess this is a security feature:
2945 * one (a user process) cannot get rid of the original name.
2947 setproctitle("%s", s);
2950 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2951 if (PL_origalen != 1) {
2953 s = SvPV_const(sv, len);
2954 un.pst_command = (char *)s;
2955 pstat(PSTAT_SETCMD, un, len, 0, 0);
2958 if (PL_origalen > 1) {
2959 /* PL_origalen is set in perl_parse(). */
2960 s = SvPV_force(sv,len);
2961 if (len >= (STRLEN)PL_origalen-1) {
2962 /* Longer than original, will be truncated. We assume that
2963 * PL_origalen bytes are available. */
2964 Copy(s, PL_origargv[0], PL_origalen-1, char);
2967 /* Shorter than original, will be padded. */
2969 /* Special case for Mac OS X: see [perl #38868] */
2972 /* Is the space counterintuitive? Yes.
2973 * (You were expecting \0?)
2974 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2976 const int pad = ' ';
2978 Copy(s, PL_origargv[0], len, char);
2979 PL_origargv[0][len] = 0;
2980 memset(PL_origargv[0] + len + 1,
2981 pad, PL_origalen - len - 1);
2983 PL_origargv[0][PL_origalen-1] = 0;
2984 for (i = 1; i < PL_origargc; i++)
2986 #ifdef HAS_PRCTL_SET_NAME
2987 /* Set the legacy process name in addition to the POSIX name on Linux */
2988 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2989 /* diag_listed_as: SKIPME */
2990 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2995 UNLOCK_DOLLARZERO_MUTEX;
3002 Perl_whichsig_sv(pTHX_ SV *sigsv)
3006 PERL_ARGS_ASSERT_WHICHSIG_SV;
3007 PERL_UNUSED_CONTEXT;
3008 sigpv = SvPV_const(sigsv, siglen);
3009 return whichsig_pvn(sigpv, siglen);
3013 Perl_whichsig_pv(pTHX_ const char *sig)
3015 PERL_ARGS_ASSERT_WHICHSIG_PV;
3016 PERL_UNUSED_CONTEXT;
3017 return whichsig_pvn(sig, strlen(sig));
3021 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3025 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3026 PERL_UNUSED_CONTEXT;
3028 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3029 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3030 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3032 if (memEQs(sig, len, "CHLD"))
3036 if (memEQs(sig, len, "CLD"))
3043 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3044 Perl_sighandler(int sig, siginfo_t *sip, void *uap)
3046 Perl_sighandler(int sig)
3049 #ifdef PERL_GET_SIG_CONTEXT
3050 dTHXa(PERL_GET_SIG_CONTEXT);
3057 SV * const tSv = PL_Sv;
3061 XPV * const tXpv = PL_Xpv;
3062 I32 old_ss_ix = PL_savestack_ix;
3063 SV *errsv_save = NULL;
3066 if (!PL_psig_ptr[sig]) {
3067 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3072 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3073 /* Max number of items pushed there is 3*n or 4. We cannot fix
3074 infinity, so we fix 4 (in fact 5): */
3075 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3077 PL_savestack_ix += 5; /* Protect save in progress. */
3078 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3081 /* sv_2cv is too complicated, try a simpler variant first: */
3082 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3083 || SvTYPE(cv) != SVt_PVCV) {
3085 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3088 if (!cv || !CvROOT(cv)) {
3089 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3090 PL_sig_name[sig], (gv ? GvENAME(gv)
3097 sv = PL_psig_name[sig]
3098 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3099 : newSVpv(PL_sig_name[sig],0);
3103 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3104 /* make sure our assumption about the size of the SAVEs are correct:
3105 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3106 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3109 PUSHSTACKi(PERLSI_SIGNAL);
3112 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3114 struct sigaction oact;
3116 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3119 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3120 /* The siginfo fields signo, code, errno, pid, uid,
3121 * addr, status, and band are defined by POSIX/SUSv3. */
3122 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3123 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3124 #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. */
3125 hv_stores(sih, "errno", newSViv(sip->si_errno));
3126 hv_stores(sih, "status", newSViv(sip->si_status));
3127 hv_stores(sih, "uid", newSViv(sip->si_uid));
3128 hv_stores(sih, "pid", newSViv(sip->si_pid));
3129 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3130 hv_stores(sih, "band", newSViv(sip->si_band));
3134 mPUSHp((char *)sip, sizeof(*sip));
3142 errsv_save = newSVsv(ERRSV);
3144 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3148 SV * const errsv = ERRSV;
3149 if (SvTRUE_NN(errsv)) {
3150 SvREFCNT_dec(errsv_save);
3152 /* Handler "died", for example to get out of a restart-able read().
3153 * Before we re-do that on its behalf re-enable the signal which was
3154 * blocked by the system when we entered.
3156 #ifdef HAS_SIGPROCMASK
3157 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3163 sigaddset(&set,sig);
3164 sigprocmask(SIG_UNBLOCK, &set, NULL);
3167 /* Not clear if this will work */
3168 (void)rsignal(sig, SIG_IGN);
3169 (void)rsignal(sig, PL_csighandlerp);
3171 #endif /* !PERL_MICRO */
3175 sv_setsv(errsv, errsv_save);
3176 SvREFCNT_dec(errsv_save);
3181 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3182 PL_savestack_ix = old_ss_ix;
3185 PL_op = myop; /* Apparently not needed... */
3187 PL_Sv = tSv; /* Restore global temporaries. */
3194 S_restore_magic(pTHX_ const void *p)
3197 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3198 SV* const sv = mgs->mgs_sv;
3204 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3205 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3206 #ifdef PERL_OLD_COPY_ON_WRITE
3207 /* While magic was saved (and off) sv_setsv may well have seen
3208 this SV as a prime candidate for COW. */
3210 sv_force_normal_flags(sv, 0);
3212 if (mgs->mgs_readonly)
3214 if (mgs->mgs_magical)
3215 SvFLAGS(sv) |= mgs->mgs_magical;
3220 bumped = mgs->mgs_bumped;
3221 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3223 /* If we're still on top of the stack, pop us off. (That condition
3224 * will be satisfied if restore_magic was called explicitly, but *not*
3225 * if it's being called via leave_scope.)
3226 * The reason for doing this is that otherwise, things like sv_2cv()
3227 * may leave alloc gunk on the savestack, and some code
3228 * (e.g. sighandler) doesn't expect that...
3230 if (PL_savestack_ix == mgs->mgs_ss_ix)
3232 UV popval = SSPOPUV;
3233 assert(popval == SAVEt_DESTRUCTOR_X);
3234 PL_savestack_ix -= 2;
3236 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3237 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3240 if (SvREFCNT(sv) == 1) {
3241 /* We hold the last reference to this SV, which implies that the
3242 SV was deleted as a side effect of the routines we called.
3243 So artificially keep it alive a bit longer.
3244 We avoid turning on the TEMP flag, which can cause the SV's
3245 buffer to get stolen (and maybe other stuff). */
3250 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
3254 /* clean up the mess created by Perl_sighandler().
3255 * Note that this is only called during an exit in a signal handler;
3256 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3260 S_unwind_handler_stack(pTHX_ const void *p)
3265 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3269 =for apidoc magic_sethint
3271 Triggered by a store to %^H, records the key/value pair to
3272 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3273 anything that would need a deep copy. Maybe we should warn if we find a
3279 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3282 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3283 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3285 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3287 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3288 an alternative leaf in there, with PL_compiling.cop_hints being used if
3289 it's NULL. If needed for threads, the alternative could lock a mutex,
3290 or take other more complex action. */
3292 /* Something changed in %^H, so it will need to be restored on scope exit.
3293 Doing this here saves a lot of doing it manually in perl code (and
3294 forgetting to do it, and consequent subtle errors. */
3295 PL_hints |= HINT_LOCALIZE_HH;
3296 CopHINTHASH_set(&PL_compiling,
3297 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3302 =for apidoc magic_clearhint
3304 Triggered by a delete from %^H, records the key to
3305 C<PL_compiling.cop_hints_hash>.
3310 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3314 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3315 PERL_UNUSED_ARG(sv);
3317 PL_hints |= HINT_LOCALIZE_HH;
3318 CopHINTHASH_set(&PL_compiling,
3319 mg->mg_len == HEf_SVKEY
3320 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3321 MUTABLE_SV(mg->mg_ptr), 0, 0)
3322 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3323 mg->mg_ptr, mg->mg_len, 0, 0));
3328 =for apidoc magic_clearhints
3330 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3335 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3337 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3338 PERL_UNUSED_ARG(sv);
3339 PERL_UNUSED_ARG(mg);
3340 cophh_free(CopHINTHASH_get(&PL_compiling));
3341 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3346 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3347 const char *name, I32 namlen)
3351 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3352 PERL_UNUSED_ARG(sv);
3353 PERL_UNUSED_ARG(name);
3354 PERL_UNUSED_ARG(namlen);
3356 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3357 nmg = mg_find(nsv, mg->mg_type);
3358 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3359 nmg->mg_ptr = mg->mg_ptr;
3360 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3361 nmg->mg_flags |= MGf_REFCOUNTED;
3367 * c-indentation-style: bsd
3369 * indent-tabs-mode: nil
3372 * ex: set ts=8 sts=4 sw=4 et: