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.
88 /* MGS is typedef'ed to struct magic_state in perl.h */
91 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
96 PERL_ARGS_ASSERT_SAVE_MAGIC;
98 assert(SvMAGICAL(sv));
99 /* Turning READONLY off for a copy-on-write scalar (including shared
100 hash keys) is a bad idea. */
102 sv_force_normal_flags(sv, 0);
104 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
106 mgs = SSPTR(mgs_ix, MGS*);
108 mgs->mgs_magical = SvMAGICAL(sv);
109 mgs->mgs_readonly = SvREADONLY(sv) != 0;
110 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
114 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
115 /* No public flags are set, so promote any private flags to public. */
116 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
121 =for apidoc mg_magical
123 Turns on the magical status of an SV. See C<sv_magic>.
129 Perl_mg_magical(pTHX_ SV *sv)
132 PERL_ARGS_ASSERT_MG_MAGICAL;
136 if ((mg = SvMAGIC(sv))) {
138 const MGVTBL* const vtbl = mg->mg_virtual;
140 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 } while ((mg = mg->mg_moremagic));
148 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
154 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
157 S_is_container_magic(const MAGIC *mg)
160 switch (mg->mg_type) {
163 case PERL_MAGIC_regex_global:
164 case PERL_MAGIC_nkeys:
165 #ifdef USE_LOCALE_COLLATE
166 case PERL_MAGIC_collxfrm:
169 case PERL_MAGIC_taint:
171 case PERL_MAGIC_vstring:
172 case PERL_MAGIC_utf8:
173 case PERL_MAGIC_substr:
174 case PERL_MAGIC_defelem:
175 case PERL_MAGIC_arylen:
177 case PERL_MAGIC_backref:
178 case PERL_MAGIC_arylen_p:
179 case PERL_MAGIC_rhash:
180 case PERL_MAGIC_symtab:
181 case PERL_MAGIC_tied: /* treat as value, so 'local @tied' isn't tied */
182 case PERL_MAGIC_checkcall:
192 Do magic after a value is retrieved from the SV. See C<sv_magic>.
198 Perl_mg_get(pTHX_ SV *sv)
201 const I32 mgs_ix = SSNEW(sizeof(MGS));
202 const bool was_temp = cBOOL(SvTEMP(sv));
204 MAGIC *newmg, *head, *cur, *mg;
205 /* guard against sv having being freed midway by holding a private
208 PERL_ARGS_ASSERT_MG_GET;
210 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
211 cause the SV's buffer to get stolen (and maybe other stuff).
214 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
219 save_magic(mgs_ix, sv);
221 /* We must call svt_get(sv, mg) for each valid entry in the linked
222 list of magic. svt_get() may delete the current entry, add new
223 magic to the head of the list, or upgrade the SV. AMS 20010810 */
225 newmg = cur = head = mg = SvMAGIC(sv);
227 const MGVTBL * const vtbl = mg->mg_virtual;
228 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
230 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
231 vtbl->svt_get(aTHX_ sv, mg);
233 /* guard against magic having been deleted - eg FETCH calling
236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
240 /* recalculate flags if this entry was deleted. */
241 if (mg->mg_flags & MGf_GSKIP)
242 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
248 /* Have we finished with the new entries we saw? Start again
249 where we left off (unless there are more new entries). */
257 /* Were any new entries added? */
258 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
262 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
266 restore_magic(INT2PTR(void *, (IV)mgs_ix));
268 if (SvREFCNT(sv) == 1) {
269 /* We hold the last reference to this SV, which implies that the
270 SV was deleted as a side effect of the routines we called. */
279 Do magic after a value is assigned to the SV. See C<sv_magic>.
285 Perl_mg_set(pTHX_ SV *sv)
288 const I32 mgs_ix = SSNEW(sizeof(MGS));
292 PERL_ARGS_ASSERT_MG_SET;
294 save_magic(mgs_ix, sv);
296 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
297 const MGVTBL* vtbl = mg->mg_virtual;
298 nextmg = mg->mg_moremagic; /* it may delete itself */
299 if (mg->mg_flags & MGf_GSKIP) {
300 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
301 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
303 if (PL_localizing == 2 && !S_is_container_magic(mg))
305 if (vtbl && vtbl->svt_set)
306 vtbl->svt_set(aTHX_ sv, mg);
309 restore_magic(INT2PTR(void*, (IV)mgs_ix));
314 =for apidoc mg_length
316 Report on the SV's length. See C<sv_magic>.
322 Perl_mg_length(pTHX_ SV *sv)
328 PERL_ARGS_ASSERT_MG_LENGTH;
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));
334 save_magic(mgs_ix, sv);
335 /* omit MGf_GSKIP -- not changed here */
336 len = vtbl->svt_len(aTHX_ sv, mg);
337 restore_magic(INT2PTR(void*, (IV)mgs_ix));
343 /* You can't know whether it's UTF-8 until you get the string again...
345 const U8 *s = (U8*)SvPV_const(sv, len);
348 len = utf8_length(s, s + len);
355 Perl_mg_size(pTHX_ SV *sv)
359 PERL_ARGS_ASSERT_MG_SIZE;
361 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
362 const MGVTBL* const vtbl = mg->mg_virtual;
363 if (vtbl && vtbl->svt_len) {
364 const I32 mgs_ix = SSNEW(sizeof(MGS));
366 save_magic(mgs_ix, sv);
367 /* omit MGf_GSKIP -- not changed here */
368 len = vtbl->svt_len(aTHX_ sv, mg);
369 restore_magic(INT2PTR(void*, (IV)mgs_ix));
376 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
380 Perl_croak(aTHX_ "Size magic not implemented");
389 Clear something magical that the SV represents. See C<sv_magic>.
395 Perl_mg_clear(pTHX_ SV *sv)
397 const I32 mgs_ix = SSNEW(sizeof(MGS));
401 PERL_ARGS_ASSERT_MG_CLEAR;
403 save_magic(mgs_ix, sv);
405 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
406 const MGVTBL* const vtbl = mg->mg_virtual;
407 /* omit GSKIP -- never set here */
409 nextmg = mg->mg_moremagic; /* it may delete itself */
411 if (vtbl && vtbl->svt_clear)
412 vtbl->svt_clear(aTHX_ sv, mg);
415 restore_magic(INT2PTR(void*, (IV)mgs_ix));
420 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
429 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
430 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
442 Finds the magic pointer for type matching the SV. See C<sv_magic>.
448 Perl_mg_find(pTHX_ const SV *sv, int type)
450 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
454 =for apidoc mg_findext
456 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
463 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
465 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
471 Copies the magic from one SV to another. See C<sv_magic>.
477 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
482 PERL_ARGS_ASSERT_MG_COPY;
484 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
485 const MGVTBL* const vtbl = mg->mg_virtual;
486 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
487 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
490 const char type = mg->mg_type;
491 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
493 (type == PERL_MAGIC_tied)
495 : (type == PERL_MAGIC_regdata && mg->mg_obj)
498 toLOWER(type), key, klen);
507 =for apidoc mg_localize
509 Copy some of the magic from an existing SV to new localized version of that
510 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
513 If setmagic is false then no set magic will be called on the new (empty) SV.
514 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
515 and that will handle the magic.
521 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
526 PERL_ARGS_ASSERT_MG_LOCALIZE;
528 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
529 const MGVTBL* const vtbl = mg->mg_virtual;
530 if (!S_is_container_magic(mg))
533 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
534 (void)vtbl->svt_local(aTHX_ nsv, mg);
536 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
537 mg->mg_ptr, mg->mg_len);
539 /* container types should remain read-only across localization */
540 SvFLAGS(nsv) |= SvREADONLY(sv);
543 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
544 SvFLAGS(nsv) |= SvMAGICAL(sv);
553 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
555 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
557 const MGVTBL* const vtbl = mg->mg_virtual;
558 if (vtbl && vtbl->svt_free)
559 vtbl->svt_free(aTHX_ sv, mg);
560 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
561 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
562 Safefree(mg->mg_ptr);
563 else if (mg->mg_len == HEf_SVKEY)
564 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
566 if (mg->mg_flags & MGf_REFCOUNTED)
567 SvREFCNT_dec(mg->mg_obj);
574 Free any magic storage used by the SV. See C<sv_magic>.
580 Perl_mg_free(pTHX_ SV *sv)
585 PERL_ARGS_ASSERT_MG_FREE;
587 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
588 moremagic = mg->mg_moremagic;
589 mg_free_struct(sv, mg);
590 SvMAGIC_set(sv, moremagic);
592 SvMAGIC_set(sv, NULL);
598 =for apidoc Am|void|mg_free_type|SV *sv|int how
600 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
606 Perl_mg_free_type(pTHX_ SV *sv, int how)
608 MAGIC *mg, *prevmg, *moremg;
609 PERL_ARGS_ASSERT_MG_FREE_TYPE;
610 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
612 moremg = mg->mg_moremagic;
613 if (mg->mg_type == how) {
614 /* temporarily move to the head of the magic chain, in case
615 custom free code relies on this historical aspect of mg_free */
617 prevmg->mg_moremagic = moremg;
618 mg->mg_moremagic = SvMAGIC(sv);
621 newhead = mg->mg_moremagic;
622 mg_free_struct(sv, mg);
623 SvMAGIC_set(sv, newhead);
633 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
638 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
641 register const REGEXP * const rx = PM_GETRE(PL_curpm);
643 if (mg->mg_obj) { /* @+ */
644 /* return the number possible */
645 return RX_NPARENS(rx);
647 I32 paren = RX_LASTPAREN(rx);
649 /* return the last filled */
651 && (RX_OFFS(rx)[paren].start == -1
652 || RX_OFFS(rx)[paren].end == -1) )
663 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
667 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
670 register const REGEXP * const rx = PM_GETRE(PL_curpm);
672 register const I32 paren = mg->mg_len;
677 if (paren <= (I32)RX_NPARENS(rx) &&
678 (s = RX_OFFS(rx)[paren].start) != -1 &&
679 (t = RX_OFFS(rx)[paren].end) != -1)
682 if (mg->mg_obj) /* @+ */
687 if (i > 0 && RX_MATCH_UTF8(rx)) {
688 const char * const b = RX_SUBBEG(rx);
690 i = utf8_length((U8*)b, (U8*)(b+i));
701 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
703 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
706 Perl_croak_no_modify(aTHX);
707 NORETURN_FUNCTION_END;
711 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
716 register const REGEXP * rx;
717 const char * const remaining = mg->mg_ptr + 1;
719 PERL_ARGS_ASSERT_MAGIC_LEN;
721 switch (*mg->mg_ptr) {
723 if (*remaining == '\0') { /* ^P */
725 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
727 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
731 case '\015': /* $^MATCH */
732 if (strEQ(remaining, "ATCH")) {
739 paren = RX_BUFF_IDX_PREMATCH;
743 paren = RX_BUFF_IDX_POSTMATCH;
747 paren = RX_BUFF_IDX_FULLMATCH;
749 case '1': case '2': case '3': case '4':
750 case '5': case '6': case '7': case '8': case '9':
751 paren = atoi(mg->mg_ptr);
753 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
755 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
758 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
761 if (ckWARN(WARN_UNINITIALIZED))
766 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
767 paren = RX_LASTPAREN(rx);
772 case '\016': /* ^N */
773 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
774 paren = RX_LASTCLOSEPAREN(rx);
781 if (!SvPOK(sv) && SvNIOK(sv)) {
789 #define SvRTRIM(sv) STMT_START { \
791 STRLEN len = SvCUR(sv); \
792 char * const p = SvPVX(sv); \
793 while (len > 0 && isSPACE(p[len-1])) \
795 SvCUR_set(sv, len); \
801 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
803 PERL_ARGS_ASSERT_EMULATE_COP_IO;
805 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
806 sv_setsv(sv, &PL_sv_undef);
810 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
811 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
816 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
817 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
825 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
829 register const char *s = NULL;
831 const char * const remaining = mg->mg_ptr + 1;
832 const char nextchar = *remaining;
834 PERL_ARGS_ASSERT_MAGIC_GET;
836 switch (*mg->mg_ptr) {
837 case '\001': /* ^A */
838 sv_setsv(sv, PL_bodytarget);
839 if (SvTAINTED(PL_bodytarget))
842 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
843 if (nextchar == '\0') {
844 sv_setiv(sv, (IV)PL_minus_c);
846 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
847 sv_setiv(sv, (IV)STATUS_NATIVE);
851 case '\004': /* ^D */
852 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
854 case '\005': /* ^E */
855 if (nextchar == '\0') {
858 # include <descrip.h>
859 # include <starlet.h>
861 $DESCRIPTOR(msgdsc,msg);
862 sv_setnv(sv,(NV) vaxc$errno);
863 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
864 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
869 if (!(_emx_env & 0x200)) { /* Under DOS */
870 sv_setnv(sv, (NV)errno);
871 sv_setpv(sv, errno ? Strerror(errno) : "");
873 if (errno != errno_isOS2) {
874 const int tmp = _syserrno();
875 if (tmp) /* 2nd call to _syserrno() makes it 0 */
878 sv_setnv(sv, (NV)Perl_rc);
879 sv_setpv(sv, os2error(Perl_rc));
883 const DWORD dwErr = GetLastError();
884 sv_setnv(sv, (NV)dwErr);
886 PerlProc_GetOSError(sv, dwErr);
895 sv_setnv(sv, (NV)errno);
896 sv_setpv(sv, errno ? Strerror(errno) : "");
901 SvNOK_on(sv); /* what a wonderful hack! */
903 else if (strEQ(remaining, "NCODING"))
904 sv_setsv(sv, PL_encoding);
906 case '\006': /* ^F */
907 sv_setiv(sv, (IV)PL_maxsysfd);
909 case '\007': /* ^GLOBAL_PHASE */
910 if (strEQ(remaining, "LOBAL_PHASE")) {
911 sv_setpvn(sv, PL_phase_names[PL_phase],
912 strlen(PL_phase_names[PL_phase]));
915 case '\010': /* ^H */
916 sv_setiv(sv, (IV)PL_hints);
918 case '\011': /* ^I */ /* NOT \t in EBCDIC */
919 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
921 case '\017': /* ^O & ^OPEN */
922 if (nextchar == '\0') {
923 sv_setpv(sv, PL_osname);
926 else if (strEQ(remaining, "PEN")) {
927 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
931 if (nextchar == '\0') { /* ^P */
932 sv_setiv(sv, (IV)PL_perldb);
933 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
934 goto do_prematch_fetch;
935 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
936 goto do_postmatch_fetch;
939 case '\023': /* ^S */
940 if (nextchar == '\0') {
941 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
944 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
949 case '\024': /* ^T */
950 if (nextchar == '\0') {
952 sv_setnv(sv, PL_basetime);
954 sv_setiv(sv, (IV)PL_basetime);
957 else if (strEQ(remaining, "AINT"))
958 sv_setiv(sv, PL_tainting
959 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
962 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
963 if (strEQ(remaining, "NICODE"))
964 sv_setuv(sv, (UV) PL_unicode);
965 else if (strEQ(remaining, "TF8LOCALE"))
966 sv_setuv(sv, (UV) PL_utf8locale);
967 else if (strEQ(remaining, "TF8CACHE"))
968 sv_setiv(sv, (IV) PL_utf8cache);
970 case '\027': /* ^W & $^WARNING_BITS */
971 if (nextchar == '\0')
972 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
973 else if (strEQ(remaining, "ARNING_BITS")) {
974 if (PL_compiling.cop_warnings == pWARN_NONE) {
975 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
977 else if (PL_compiling.cop_warnings == pWARN_STD) {
980 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
984 else if (PL_compiling.cop_warnings == pWARN_ALL) {
985 /* Get the bit mask for $warnings::Bits{all}, because
986 * it could have been extended by warnings::register */
987 HV * const bits=get_hv("warnings::Bits", 0);
989 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
991 sv_setsv(sv, *bits_all);
994 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
998 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
999 *PL_compiling.cop_warnings);
1004 case '\015': /* $^MATCH */
1005 if (strEQ(remaining, "ATCH")) {
1006 case '1': case '2': case '3': case '4':
1007 case '5': case '6': case '7': case '8': case '9': case '&':
1008 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1010 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
1011 * XXX Does the new way break anything?
1013 paren = atoi(mg->mg_ptr); /* $& is in [0] */
1014 CALLREG_NUMBUF_FETCH(rx,paren,sv);
1017 sv_setsv(sv,&PL_sv_undef);
1021 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1022 if (RX_LASTPAREN(rx)) {
1023 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
1027 sv_setsv(sv,&PL_sv_undef);
1029 case '\016': /* ^N */
1030 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1031 if (RX_LASTCLOSEPAREN(rx)) {
1032 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
1037 sv_setsv(sv,&PL_sv_undef);
1041 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1042 CALLREG_NUMBUF_FETCH(rx,-2,sv);
1045 sv_setsv(sv,&PL_sv_undef);
1049 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1050 CALLREG_NUMBUF_FETCH(rx,-1,sv);
1053 sv_setsv(sv,&PL_sv_undef);
1056 if (GvIO(PL_last_in_gv)) {
1057 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1062 sv_setiv(sv, (IV)STATUS_CURRENT);
1063 #ifdef COMPLEX_STATUS
1064 SvUPGRADE(sv, SVt_PVLV);
1065 LvTARGOFF(sv) = PL_statusvalue;
1066 LvTARGLEN(sv) = PL_statusvalue_vms;
1071 if (!isGV_with_GP(PL_defoutgv))
1073 else if (GvIOp(PL_defoutgv))
1074 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1078 sv_setpv(sv,GvENAME(PL_defoutgv));
1079 sv_catpvs(sv,"_TOP");
1083 if (!isGV_with_GP(PL_defoutgv))
1085 else if (GvIOp(PL_defoutgv))
1086 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1088 s = GvENAME(PL_defoutgv);
1092 if (GvIO(PL_defoutgv))
1093 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1096 if (GvIO(PL_defoutgv))
1097 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1100 if (GvIO(PL_defoutgv))
1101 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1108 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1111 if (GvIO(PL_defoutgv))
1112 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1116 sv_copypv(sv, PL_ors_sv);
1122 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1124 sv_setnv(sv, (NV)errno);
1127 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1128 sv_setpv(sv, os2error(Perl_rc));
1131 sv_setpv(sv, errno ? Strerror(errno) : "");
1133 SvPOK_on(sv); /* may have got removed during taint processing */
1138 SvNOK_on(sv); /* what a wonderful hack! */
1141 sv_setiv(sv, (IV)PL_uid);
1144 sv_setiv(sv, (IV)PL_euid);
1147 sv_setiv(sv, (IV)PL_gid);
1150 sv_setiv(sv, (IV)PL_egid);
1152 #ifdef HAS_GETGROUPS
1154 Groups_t *gary = NULL;
1155 I32 i, num_groups = getgroups(0, gary);
1156 Newx(gary, num_groups, Groups_t);
1157 num_groups = getgroups(num_groups, gary);
1158 for (i = 0; i < num_groups; i++)
1159 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1162 (void)SvIOK_on(sv); /* what a wonderful hack! */
1172 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1174 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1176 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1178 if (uf && uf->uf_val)
1179 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1184 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1187 STRLEN len = 0, klen;
1188 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1189 const char * const ptr = MgPV_const(mg,klen);
1192 PERL_ARGS_ASSERT_MAGIC_SETENV;
1194 #ifdef DYNAMIC_ENV_FETCH
1195 /* We just undefd an environment var. Is a replacement */
1196 /* waiting in the wings? */
1198 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1200 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1204 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1205 /* And you'll never guess what the dog had */
1206 /* in its mouth... */
1208 MgTAINTEDDIR_off(mg);
1210 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1211 char pathbuf[256], eltbuf[256], *cp, *elt;
1215 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1217 do { /* DCL$PATH may be a search list */
1218 while (1) { /* as may dev portion of any element */
1219 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1220 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1221 cando_by_name(S_IWUSR,0,elt) ) {
1222 MgTAINTEDDIR_on(mg);
1226 if ((cp = strchr(elt, ':')) != NULL)
1228 if (my_trnlnm(elt, eltbuf, j++))
1234 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1237 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1238 const char * const strend = s + len;
1240 while (s < strend) {
1244 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1245 const char path_sep = '|';
1247 const char path_sep = ':';
1249 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1250 s, strend, path_sep, &i);
1252 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1254 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1256 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1258 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1259 MgTAINTEDDIR_on(mg);
1265 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1271 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1273 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1274 PERL_UNUSED_ARG(sv);
1275 my_setenv(MgPV_nolen_const(mg),NULL);
1280 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1283 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1284 PERL_UNUSED_ARG(mg);
1286 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1288 if (PL_localizing) {
1291 hv_iterinit(MUTABLE_HV(sv));
1292 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1294 my_setenv(hv_iterkey(entry, &keylen),
1295 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1303 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1306 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1307 PERL_UNUSED_ARG(sv);
1308 PERL_UNUSED_ARG(mg);
1310 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1318 #ifdef HAS_SIGPROCMASK
1320 restore_sigmask(pTHX_ SV *save_sv)
1322 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1323 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1327 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1330 /* Are we fetching a signal entry? */
1331 int i = (I16)mg->mg_private;
1333 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1336 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1341 sv_setsv(sv,PL_psig_ptr[i]);
1343 Sighandler_t sigstate = rsignal_state(i);
1344 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1345 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1348 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1349 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1352 /* cache state so we don't fetch it again */
1353 if(sigstate == (Sighandler_t) SIG_IGN)
1354 sv_setpvs(sv,"IGNORE");
1356 sv_setsv(sv,&PL_sv_undef);
1357 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1364 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1366 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1367 PERL_UNUSED_ARG(sv);
1369 magic_setsig(NULL, mg);
1370 return sv_unmagic(sv, mg->mg_type);
1374 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1375 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1377 Perl_csighandler(int sig)
1380 #ifdef PERL_GET_SIG_CONTEXT
1381 dTHXa(PERL_GET_SIG_CONTEXT);
1385 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1386 (void) rsignal(sig, PL_csighandlerp);
1387 if (PL_sig_ignoring[sig]) return;
1389 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1390 if (PL_sig_defaulting[sig])
1391 #ifdef KILL_BY_SIGPRC
1392 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1407 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1408 /* Call the perl level handler now--
1409 * with risk we may be in malloc() or being destructed etc. */
1410 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1411 (*PL_sighandlerp)(sig, NULL, NULL);
1413 (*PL_sighandlerp)(sig);
1416 if (!PL_psig_pend) return;
1417 /* Set a flag to say this signal is pending, that is awaiting delivery after
1418 * the current Perl opcode completes */
1419 PL_psig_pend[sig]++;
1421 #ifndef SIG_PENDING_DIE_COUNT
1422 # define SIG_PENDING_DIE_COUNT 120
1424 /* Add one to say _a_ signal is pending */
1425 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1426 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1427 (unsigned long)SIG_PENDING_DIE_COUNT);
1431 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1433 Perl_csighandler_init(void)
1436 if (PL_sig_handlers_initted) return;
1438 for (sig = 1; sig < SIG_SIZE; sig++) {
1439 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1441 PL_sig_defaulting[sig] = 1;
1442 (void) rsignal(sig, PL_csighandlerp);
1444 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1445 PL_sig_ignoring[sig] = 0;
1448 PL_sig_handlers_initted = 1;
1453 Perl_despatch_signals(pTHX)
1458 for (sig = 1; sig < SIG_SIZE; sig++) {
1459 if (PL_psig_pend[sig]) {
1461 PERL_BLOCKSIG_ADD(set, sig);
1462 PL_psig_pend[sig] = 0;
1463 PERL_BLOCKSIG_BLOCK(set);
1464 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1465 (*PL_sighandlerp)(sig, NULL, NULL);
1467 (*PL_sighandlerp)(sig);
1469 PERL_BLOCKSIG_UNBLOCK(set);
1475 /* sv of NULL signifies that we're acting as magic_clearsig. */
1477 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1482 /* Need to be careful with SvREFCNT_dec(), because that can have side
1483 * effects (due to closures). We must make sure that the new disposition
1484 * is in place before it is called.
1488 #ifdef HAS_SIGPROCMASK
1492 register const char *s = MgPV_const(mg,len);
1494 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1497 if (strEQ(s,"__DIE__"))
1499 else if (strEQ(s,"__WARN__")
1500 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1501 /* Merge the existing behaviours, which are as follows:
1502 magic_setsig, we always set svp to &PL_warnhook
1503 (hence we always change the warnings handler)
1504 For magic_clearsig, we don't change the warnings handler if it's
1505 set to the &PL_warnhook. */
1508 Perl_croak(aTHX_ "No such hook: %s", s);
1511 if (*svp != PERL_WARNHOOK_FATAL)
1517 i = (I16)mg->mg_private;
1519 i = whichsig(s); /* ...no, a brick */
1520 mg->mg_private = (U16)i;
1524 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1527 #ifdef HAS_SIGPROCMASK
1528 /* Avoid having the signal arrive at a bad time, if possible. */
1531 sigprocmask(SIG_BLOCK, &set, &save);
1533 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1534 SAVEFREESV(save_sv);
1535 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1538 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1539 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1541 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1542 PL_sig_ignoring[i] = 0;
1544 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1545 PL_sig_defaulting[i] = 0;
1547 to_dec = PL_psig_ptr[i];
1549 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1550 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1552 /* Signals don't change name during the program's execution, so once
1553 they're cached in the appropriate slot of PL_psig_name, they can
1556 Ideally we'd find some way of making SVs at (C) compile time, or
1557 at least, doing most of the work. */
1558 if (!PL_psig_name[i]) {
1559 PL_psig_name[i] = newSVpvn(s, len);
1560 SvREADONLY_on(PL_psig_name[i]);
1563 SvREFCNT_dec(PL_psig_name[i]);
1564 PL_psig_name[i] = NULL;
1565 PL_psig_ptr[i] = NULL;
1568 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1570 (void)rsignal(i, PL_csighandlerp);
1573 *svp = SvREFCNT_inc_simple_NN(sv);
1575 if (sv && SvOK(sv)) {
1576 s = SvPV_force(sv, len);
1580 if (sv && strEQ(s,"IGNORE")) {
1582 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1583 PL_sig_ignoring[i] = 1;
1584 (void)rsignal(i, PL_csighandlerp);
1586 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1590 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1592 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1593 PL_sig_defaulting[i] = 1;
1594 (void)rsignal(i, PL_csighandlerp);
1596 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1602 * We should warn if HINT_STRICT_REFS, but without
1603 * access to a known hint bit in a known OP, we can't
1604 * tell whether HINT_STRICT_REFS is in force or not.
1606 if (!strchr(s,':') && !strchr(s,'\''))
1607 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1610 (void)rsignal(i, PL_csighandlerp);
1612 *svp = SvREFCNT_inc_simple_NN(sv);
1616 #ifdef HAS_SIGPROCMASK
1620 SvREFCNT_dec(to_dec);
1623 #endif /* !PERL_MICRO */
1626 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1629 PERL_ARGS_ASSERT_MAGIC_SETISA;
1630 PERL_UNUSED_ARG(sv);
1632 /* Skip _isaelem because _isa will handle it shortly */
1633 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1636 return magic_clearisa(NULL, mg);
1639 /* sv of NULL signifies that we're acting as magic_setisa. */
1641 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1646 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1648 /* Bail out if destruction is going on */
1649 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1652 av_clear(MUTABLE_AV(sv));
1654 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1655 /* This occurs with setisa_elem magic, which calls this
1657 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1659 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1660 SV **svp = AvARRAY((AV *)mg->mg_obj);
1661 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1663 stash = GvSTASH((GV *)*svp++);
1664 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1671 (const GV *)mg->mg_obj
1674 /* The stash may have been detached from the symbol table, so check its
1675 name before doing anything. */
1676 if (stash && HvENAME_get(stash))
1677 mro_isa_changed_in(stash);
1683 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1686 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1687 PERL_UNUSED_ARG(sv);
1688 PERL_UNUSED_ARG(mg);
1689 PL_amagic_generation++;
1695 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1697 HV * const hv = MUTABLE_HV(LvTARG(sv));
1700 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1701 PERL_UNUSED_ARG(mg);
1704 (void) hv_iterinit(hv);
1705 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1708 while (hv_iternext(hv))
1713 sv_setiv(sv, (IV)i);
1718 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1720 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1721 PERL_UNUSED_ARG(mg);
1723 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1729 =for apidoc magic_methcall
1731 Invoke a magic method (like FETCH).
1733 * sv and mg are the tied thinggy and the tie magic;
1734 * meth is the name of the method to call;
1735 * argc is the number of args (in addition to $self) to pass to the method;
1736 the args themselves are any values following the argc argument.
1738 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1739 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
1741 Returns the SV (if any) returned by the method, or NULL on failure.
1748 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1755 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1758 PUSHSTACKi(PERLSI_MAGIC);
1762 PUSHs(SvTIED_obj(sv, mg));
1763 if (flags & G_UNDEF_FILL) {
1765 PUSHs(&PL_sv_undef);
1767 } else if (argc > 0) {
1769 va_start(args, argc);
1772 SV *const sv = va_arg(args, SV *);
1779 if (flags & G_DISCARD) {
1780 call_method(meth, G_SCALAR|G_DISCARD);
1783 if (call_method(meth, G_SCALAR))
1784 ret = *PL_stack_sp--;
1792 /* wrapper for magic_methcall that creates the first arg */
1795 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1801 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1804 if (mg->mg_len >= 0) {
1805 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1807 else if (mg->mg_len == HEf_SVKEY)
1808 arg1 = MUTABLE_SV(mg->mg_ptr);
1810 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1811 arg1 = newSViv((IV)(mg->mg_len));
1815 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1817 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1821 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1826 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1828 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1835 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1837 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1839 if (mg->mg_type == PERL_MAGIC_tiedelem)
1840 mg->mg_flags |= MGf_GSKIP;
1841 magic_methpack(sv,mg,"FETCH");
1846 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1852 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1854 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1855 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1856 * public flags indicate its value based on copying from $val. Doing
1857 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1858 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1859 * wrong if $val happened to be tainted, as sv hasn't got magic
1860 * enabled, even though taint magic is in the chain. In which case,
1861 * fake up a temporary tainted value (this is easier than temporarily
1862 * re-enabling magic on sv). */
1864 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1865 && (tmg->mg_len & 1))
1867 val = sv_mortalcopy(sv);
1873 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1878 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1880 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1882 return magic_methpack(sv,mg,"DELETE");
1887 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1893 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1895 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1897 retval = SvIV(retsv)-1;
1899 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1901 return (U32) retval;
1905 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1909 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1911 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1916 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1921 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1923 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1924 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1931 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1933 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1935 return magic_methpack(sv,mg,"EXISTS");
1939 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1943 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1944 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1946 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1948 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1950 if (HvEITER_get(hv))
1951 /* we are in an iteration so the hash cannot be empty */
1953 /* no xhv_eiter so now use FIRSTKEY */
1954 key = sv_newmortal();
1955 magic_nextpack(MUTABLE_SV(hv), mg, key);
1956 HvEITER_set(hv, NULL); /* need to reset iterator */
1957 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1960 /* there is a SCALAR method that we can call */
1961 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
1963 retval = &PL_sv_undef;
1968 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1971 GV * const gv = PL_DBline;
1972 const I32 i = SvTRUE(sv);
1973 SV ** const svp = av_fetch(GvAV(gv),
1974 atoi(MgPV_nolen_const(mg)), FALSE);
1976 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1978 if (svp && SvIOKp(*svp)) {
1979 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1981 /* set or clear breakpoint in the relevant control op */
1983 o->op_flags |= OPf_SPECIAL;
1985 o->op_flags &= ~OPf_SPECIAL;
1992 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1995 AV * const obj = MUTABLE_AV(mg->mg_obj);
1997 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2000 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
2008 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2011 AV * const obj = MUTABLE_AV(mg->mg_obj);
2013 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2016 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
2018 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2019 "Attempt to set length of freed array");
2025 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2029 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2030 PERL_UNUSED_ARG(sv);
2032 /* during global destruction, mg_obj may already have been freed */
2033 if (PL_in_clean_all)
2036 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2039 /* arylen scalar holds a pointer back to the array, but doesn't own a
2040 reference. Hence the we (the array) are about to go away with it
2041 still pointing at us. Clear its pointer, else it would be pointing
2042 at free memory. See the comment in sv_magic about reference loops,
2043 and why it can't own a reference to us. */
2050 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2053 SV* const lsv = LvTARG(sv);
2055 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2056 PERL_UNUSED_ARG(mg);
2058 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2059 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2060 if (found && found->mg_len >= 0) {
2061 I32 i = found->mg_len;
2063 sv_pos_b2u(lsv, &i);
2064 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
2073 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2076 SV* const lsv = LvTARG(sv);
2082 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2083 PERL_UNUSED_ARG(mg);
2085 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2086 found = mg_find(lsv, PERL_MAGIC_regex_global);
2092 #ifdef PERL_OLD_COPY_ON_WRITE
2094 sv_force_normal_flags(lsv, 0);
2096 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2099 else if (!SvOK(sv)) {
2103 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2105 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2108 ulen = sv_len_utf8(lsv);
2118 else if (pos > (SSize_t)len)
2123 sv_pos_u2b(lsv, &p, 0);
2127 found->mg_len = pos;
2128 found->mg_flags &= ~MGf_MINMATCH;
2134 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2137 SV * const lsv = LvTARG(sv);
2138 const char * const tmps = SvPV_const(lsv,len);
2139 STRLEN offs = LvTARGOFF(sv);
2140 STRLEN rem = LvTARGLEN(sv);
2142 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2143 PERL_UNUSED_ARG(mg);
2146 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
2149 if (rem > len - offs)
2151 sv_setpvn(sv, tmps + offs, rem);
2158 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2162 const char * const tmps = SvPV_const(sv, len);
2163 SV * const lsv = LvTARG(sv);
2164 STRLEN lvoff = LvTARGOFF(sv);
2165 STRLEN lvlen = LvTARGLEN(sv);
2167 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2168 PERL_UNUSED_ARG(mg);
2171 sv_utf8_upgrade(lsv);
2172 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2173 sv_insert(lsv, lvoff, lvlen, tmps, len);
2174 LvTARGLEN(sv) = sv_len_utf8(sv);
2177 else if (lsv && SvUTF8(lsv)) {
2179 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2180 LvTARGLEN(sv) = len;
2181 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2182 sv_insert(lsv, lvoff, lvlen, utf8, len);
2186 sv_insert(lsv, lvoff, lvlen, tmps, len);
2187 LvTARGLEN(sv) = len;
2194 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2198 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2199 PERL_UNUSED_ARG(sv);
2201 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2206 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2210 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2211 PERL_UNUSED_ARG(sv);
2213 /* update taint status */
2222 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2224 SV * const lsv = LvTARG(sv);
2226 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2227 PERL_UNUSED_ARG(mg);
2230 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2238 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2240 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2241 PERL_UNUSED_ARG(mg);
2242 do_vecset(sv); /* XXX slurp this routine */
2247 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2252 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2254 if (LvTARGLEN(sv)) {
2256 SV * const ahv = LvTARG(sv);
2257 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2262 AV *const av = MUTABLE_AV(LvTARG(sv));
2263 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2264 targ = AvARRAY(av)[LvTARGOFF(sv)];
2266 if (targ && (targ != &PL_sv_undef)) {
2267 /* somebody else defined it for us */
2268 SvREFCNT_dec(LvTARG(sv));
2269 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2271 SvREFCNT_dec(mg->mg_obj);
2273 mg->mg_flags &= ~MGf_REFCOUNTED;
2278 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2283 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2285 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2286 PERL_UNUSED_ARG(mg);
2290 sv_setsv(LvTARG(sv), sv);
2291 SvSETMAGIC(LvTARG(sv));
2297 Perl_vivify_defelem(pTHX_ SV *sv)
2303 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2305 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2308 SV * const ahv = LvTARG(sv);
2309 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2312 if (!value || value == &PL_sv_undef)
2313 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2316 AV *const av = MUTABLE_AV(LvTARG(sv));
2317 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2318 LvTARG(sv) = NULL; /* array can't be extended */
2320 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2321 if (!svp || (value = *svp) == &PL_sv_undef)
2322 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2325 SvREFCNT_inc_simple_void(value);
2326 SvREFCNT_dec(LvTARG(sv));
2329 SvREFCNT_dec(mg->mg_obj);
2331 mg->mg_flags &= ~MGf_REFCOUNTED;
2335 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2337 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2338 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2343 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2345 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2346 PERL_UNUSED_CONTEXT;
2348 if (!isGV_with_GP(sv))
2354 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2356 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2358 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2360 if (uf && uf->uf_set)
2361 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2366 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2368 const char type = mg->mg_type;
2370 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2372 if (type == PERL_MAGIC_qr) {
2373 } else if (type == PERL_MAGIC_bm) {
2377 assert(type == PERL_MAGIC_fm);
2380 return sv_unmagic(sv, type);
2383 #ifdef USE_LOCALE_COLLATE
2385 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2387 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2390 * RenE<eacute> Descartes said "I think not."
2391 * and vanished with a faint plop.
2393 PERL_UNUSED_CONTEXT;
2394 PERL_UNUSED_ARG(sv);
2396 Safefree(mg->mg_ptr);
2402 #endif /* USE_LOCALE_COLLATE */
2404 /* Just clear the UTF-8 cache data. */
2406 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2408 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2409 PERL_UNUSED_CONTEXT;
2410 PERL_UNUSED_ARG(sv);
2411 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2413 mg->mg_len = -1; /* The mg_len holds the len cache. */
2418 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2421 register const char *s;
2423 register const REGEXP * rx;
2424 const char * const remaining = mg->mg_ptr + 1;
2429 PERL_ARGS_ASSERT_MAGIC_SET;
2431 switch (*mg->mg_ptr) {
2432 case '\015': /* $^MATCH */
2433 if (strEQ(remaining, "ATCH"))
2435 case '`': /* ${^PREMATCH} caught below */
2437 paren = RX_BUFF_IDX_PREMATCH;
2439 case '\'': /* ${^POSTMATCH} caught below */
2441 paren = RX_BUFF_IDX_POSTMATCH;
2445 paren = RX_BUFF_IDX_FULLMATCH;
2447 case '1': case '2': case '3': case '4':
2448 case '5': case '6': case '7': case '8': case '9':
2449 paren = atoi(mg->mg_ptr);
2451 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2452 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2454 /* Croak with a READONLY error when a numbered match var is
2455 * set without a previous pattern match. Unless it's C<local $1>
2457 if (!PL_localizing) {
2458 Perl_croak_no_modify(aTHX);
2462 case '\001': /* ^A */
2463 sv_setsv(PL_bodytarget, sv);
2464 /* mg_set() has temporarily made sv non-magical */
2466 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2467 SvTAINTED_on(PL_bodytarget);
2469 SvTAINTED_off(PL_bodytarget);
2472 case '\003': /* ^C */
2473 PL_minus_c = cBOOL(SvIV(sv));
2476 case '\004': /* ^D */
2478 s = SvPV_nolen_const(sv);
2479 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2480 if (DEBUG_x_TEST || DEBUG_B_TEST)
2481 dump_all_perl(!DEBUG_B_TEST);
2483 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2486 case '\005': /* ^E */
2487 if (*(mg->mg_ptr+1) == '\0') {
2489 set_vaxc_errno(SvIV(sv));
2492 SetLastError( SvIV(sv) );
2495 os2_setsyserrno(SvIV(sv));
2497 /* will anyone ever use this? */
2498 SETERRNO(SvIV(sv), 4);
2503 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2504 SvREFCNT_dec(PL_encoding);
2505 if (SvOK(sv) || SvGMAGICAL(sv)) {
2506 PL_encoding = newSVsv(sv);
2513 case '\006': /* ^F */
2514 PL_maxsysfd = SvIV(sv);
2516 case '\010': /* ^H */
2517 PL_hints = SvIV(sv);
2519 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2520 Safefree(PL_inplace);
2521 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2523 case '\017': /* ^O */
2524 if (*(mg->mg_ptr+1) == '\0') {
2525 Safefree(PL_osname);
2528 TAINT_PROPER("assigning to $^O");
2529 PL_osname = savesvpv(sv);
2532 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2534 const char *const start = SvPV(sv, len);
2535 const char *out = (const char*)memchr(start, '\0', len);
2539 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2540 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2542 /* Opening for input is more common than opening for output, so
2543 ensure that hints for input are sooner on linked list. */
2544 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2546 : newSVpvs_flags("", SvUTF8(sv));
2547 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2550 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2552 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2556 case '\020': /* ^P */
2557 if (*remaining == '\0') { /* ^P */
2558 PL_perldb = SvIV(sv);
2559 if (PL_perldb && !PL_DBsingle)
2562 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2564 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2568 case '\024': /* ^T */
2570 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2572 PL_basetime = (Time_t)SvIV(sv);
2575 case '\025': /* ^UTF8CACHE */
2576 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2577 PL_utf8cache = (signed char) sv_2iv(sv);
2580 case '\027': /* ^W & $^WARNING_BITS */
2581 if (*(mg->mg_ptr+1) == '\0') {
2582 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2584 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2585 | (i ? G_WARN_ON : G_WARN_OFF) ;
2588 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2589 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2590 if (!SvPOK(sv) && PL_localizing) {
2591 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2592 PL_compiling.cop_warnings = pWARN_NONE;
2597 int accumulate = 0 ;
2598 int any_fatals = 0 ;
2599 const char * const ptr = SvPV_const(sv, len) ;
2600 for (i = 0 ; i < len ; ++i) {
2601 accumulate |= ptr[i] ;
2602 any_fatals |= (ptr[i] & 0xAA) ;
2605 if (!specialWARN(PL_compiling.cop_warnings))
2606 PerlMemShared_free(PL_compiling.cop_warnings);
2607 PL_compiling.cop_warnings = pWARN_NONE;
2609 /* Yuck. I can't see how to abstract this: */
2610 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2611 WARN_ALL) && !any_fatals) {
2612 if (!specialWARN(PL_compiling.cop_warnings))
2613 PerlMemShared_free(PL_compiling.cop_warnings);
2614 PL_compiling.cop_warnings = pWARN_ALL;
2615 PL_dowarn |= G_WARN_ONCE ;
2619 const char *const p = SvPV_const(sv, len);
2621 PL_compiling.cop_warnings
2622 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2625 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2626 PL_dowarn |= G_WARN_ONCE ;
2634 if (PL_localizing) {
2635 if (PL_localizing == 1)
2636 SAVESPTR(PL_last_in_gv);
2638 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2639 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2642 if (isGV_with_GP(PL_defoutgv)) {
2643 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2644 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2645 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2649 if (isGV_with_GP(PL_defoutgv)) {
2650 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2651 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2652 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2656 if (isGV_with_GP(PL_defoutgv))
2657 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2660 if (isGV_with_GP(PL_defoutgv)) {
2661 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2662 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2663 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2667 if (isGV_with_GP(PL_defoutgv))
2668 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2672 IO * const io = GvIO(PL_defoutgv);
2675 if ((SvIV(sv)) == 0)
2676 IoFLAGS(io) &= ~IOf_FLUSH;
2678 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2679 PerlIO *ofp = IoOFP(io);
2681 (void)PerlIO_flush(ofp);
2682 IoFLAGS(io) |= IOf_FLUSH;
2688 SvREFCNT_dec(PL_rs);
2689 PL_rs = newSVsv(sv);
2692 SvREFCNT_dec(PL_ors_sv);
2693 if (SvOK(sv) || SvGMAGICAL(sv)) {
2694 PL_ors_sv = newSVsv(sv);
2701 CopARYBASE_set(&PL_compiling, SvIV(sv));
2704 #ifdef COMPLEX_STATUS
2705 if (PL_localizing == 2) {
2706 SvUPGRADE(sv, SVt_PVLV);
2707 PL_statusvalue = LvTARGOFF(sv);
2708 PL_statusvalue_vms = LvTARGLEN(sv);
2712 #ifdef VMSISH_STATUS
2714 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2717 STATUS_UNIX_EXIT_SET(SvIV(sv));
2722 # define PERL_VMS_BANG vaxc$errno
2724 # define PERL_VMS_BANG 0
2726 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2727 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2732 if (PL_delaymagic) {
2733 PL_delaymagic |= DM_RUID;
2734 break; /* don't do magic till later */
2737 (void)setruid((Uid_t)PL_uid);
2740 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2742 #ifdef HAS_SETRESUID
2743 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2745 if (PL_uid == PL_euid) { /* special case $< = $> */
2747 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2748 if (PL_uid != 0 && PerlProc_getuid() == 0)
2749 (void)PerlProc_setuid(0);
2751 (void)PerlProc_setuid(PL_uid);
2753 PL_uid = PerlProc_getuid();
2754 Perl_croak(aTHX_ "setruid() not implemented");
2759 PL_uid = PerlProc_getuid();
2763 if (PL_delaymagic) {
2764 PL_delaymagic |= DM_EUID;
2765 break; /* don't do magic till later */
2768 (void)seteuid((Uid_t)PL_euid);
2771 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2773 #ifdef HAS_SETRESUID
2774 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2776 if (PL_euid == PL_uid) /* special case $> = $< */
2777 PerlProc_setuid(PL_euid);
2779 PL_euid = PerlProc_geteuid();
2780 Perl_croak(aTHX_ "seteuid() not implemented");
2785 PL_euid = PerlProc_geteuid();
2789 if (PL_delaymagic) {
2790 PL_delaymagic |= DM_RGID;
2791 break; /* don't do magic till later */
2794 (void)setrgid((Gid_t)PL_gid);
2797 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2799 #ifdef HAS_SETRESGID
2800 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2802 if (PL_gid == PL_egid) /* special case $( = $) */
2803 (void)PerlProc_setgid(PL_gid);
2805 PL_gid = PerlProc_getgid();
2806 Perl_croak(aTHX_ "setrgid() not implemented");
2811 PL_gid = PerlProc_getgid();
2814 #ifdef HAS_SETGROUPS
2816 const char *p = SvPV_const(sv, len);
2817 Groups_t *gary = NULL;
2818 #ifdef _SC_NGROUPS_MAX
2819 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2824 int maxgrp = NGROUPS;
2830 for (i = 0; i < maxgrp; ++i) {
2831 while (*p && !isSPACE(*p))
2838 Newx(gary, i + 1, Groups_t);
2840 Renew(gary, i + 1, Groups_t);
2844 (void)setgroups(i, gary);
2847 #else /* HAS_SETGROUPS */
2849 #endif /* HAS_SETGROUPS */
2850 if (PL_delaymagic) {
2851 PL_delaymagic |= DM_EGID;
2852 break; /* don't do magic till later */
2855 (void)setegid((Gid_t)PL_egid);
2858 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2860 #ifdef HAS_SETRESGID
2861 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2863 if (PL_egid == PL_gid) /* special case $) = $( */
2864 (void)PerlProc_setgid(PL_egid);
2866 PL_egid = PerlProc_getegid();
2867 Perl_croak(aTHX_ "setegid() not implemented");
2872 PL_egid = PerlProc_getegid();
2875 PL_chopset = SvPV_force(sv,len);
2878 LOCK_DOLLARZERO_MUTEX;
2879 #ifdef HAS_SETPROCTITLE
2880 /* The BSDs don't show the argv[] in ps(1) output, they
2881 * show a string from the process struct and provide
2882 * the setproctitle() routine to manipulate that. */
2883 if (PL_origalen != 1) {
2884 s = SvPV_const(sv, len);
2885 # if __FreeBSD_version > 410001
2886 /* The leading "-" removes the "perl: " prefix,
2887 * but not the "(perl) suffix from the ps(1)
2888 * output, because that's what ps(1) shows if the
2889 * argv[] is modified. */
2890 setproctitle("-%s", s);
2891 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2892 /* This doesn't really work if you assume that
2893 * $0 = 'foobar'; will wipe out 'perl' from the $0
2894 * because in ps(1) output the result will be like
2895 * sprintf("perl: %s (perl)", s)
2896 * I guess this is a security feature:
2897 * one (a user process) cannot get rid of the original name.
2899 setproctitle("%s", s);
2902 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2903 if (PL_origalen != 1) {
2905 s = SvPV_const(sv, len);
2906 un.pst_command = (char *)s;
2907 pstat(PSTAT_SETCMD, un, len, 0, 0);
2910 if (PL_origalen > 1) {
2911 /* PL_origalen is set in perl_parse(). */
2912 s = SvPV_force(sv,len);
2913 if (len >= (STRLEN)PL_origalen-1) {
2914 /* Longer than original, will be truncated. We assume that
2915 * PL_origalen bytes are available. */
2916 Copy(s, PL_origargv[0], PL_origalen-1, char);
2919 /* Shorter than original, will be padded. */
2921 /* Special case for Mac OS X: see [perl #38868] */
2924 /* Is the space counterintuitive? Yes.
2925 * (You were expecting \0?)
2926 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2928 const int pad = ' ';
2930 Copy(s, PL_origargv[0], len, char);
2931 PL_origargv[0][len] = 0;
2932 memset(PL_origargv[0] + len + 1,
2933 pad, PL_origalen - len - 1);
2935 PL_origargv[0][PL_origalen-1] = 0;
2936 for (i = 1; i < PL_origargc; i++)
2938 #ifdef HAS_PRCTL_SET_NAME
2939 /* Set the legacy process name in addition to the POSIX name on Linux */
2940 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2941 /* diag_listed_as: SKIPME */
2942 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2947 UNLOCK_DOLLARZERO_MUTEX;
2954 Perl_whichsig(pTHX_ const char *sig)
2956 register char* const* sigv;
2958 PERL_ARGS_ASSERT_WHICHSIG;
2959 PERL_UNUSED_CONTEXT;
2961 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2962 if (strEQ(sig,*sigv))
2963 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2965 if (strEQ(sig,"CHLD"))
2969 if (strEQ(sig,"CLD"))
2976 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2977 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2979 Perl_sighandler(int sig)
2982 #ifdef PERL_GET_SIG_CONTEXT
2983 dTHXa(PERL_GET_SIG_CONTEXT);
2990 SV * const tSv = PL_Sv;
2994 XPV * const tXpv = PL_Xpv;
2995 I32 old_ss_ix = PL_savestack_ix;
2998 if (!PL_psig_ptr[sig]) {
2999 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3004 /* Max number of items pushed there is 3*n or 4. We cannot fix
3005 infinity, so we fix 4 (in fact 5): */
3006 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3008 PL_savestack_ix += 5; /* Protect save in progress. */
3009 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3011 if (PL_markstack_ptr < PL_markstack_max - 2) {
3013 PL_markstack_ptr++; /* Protect mark. */
3015 if (PL_scopestack_ix < PL_scopestack_max - 3) {
3019 /* sv_2cv is too complicated, try a simpler variant first: */
3020 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3021 || SvTYPE(cv) != SVt_PVCV) {
3023 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3026 if (!cv || !CvROOT(cv)) {
3027 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3028 PL_sig_name[sig], (gv ? GvENAME(gv)
3035 sv = PL_psig_name[sig]
3036 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3037 : newSVpv(PL_sig_name[sig],0);
3041 /* make sure our assumption about the size of the SAVEs are correct:
3042 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3043 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3045 PUSHSTACKi(PERLSI_SIGNAL);
3048 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3050 struct sigaction oact;
3052 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3055 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3056 /* The siginfo fields signo, code, errno, pid, uid,
3057 * addr, status, and band are defined by POSIX/SUSv3. */
3058 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3059 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3060 #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. */
3061 hv_stores(sih, "errno", newSViv(sip->si_errno));
3062 hv_stores(sih, "status", newSViv(sip->si_status));
3063 hv_stores(sih, "uid", newSViv(sip->si_uid));
3064 hv_stores(sih, "pid", newSViv(sip->si_pid));
3065 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3066 hv_stores(sih, "band", newSViv(sip->si_band));
3070 mPUSHp((char *)sip, sizeof(*sip));
3078 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3081 if (SvTRUE(ERRSV)) {
3083 #ifdef HAS_SIGPROCMASK
3084 /* Handler "died", for example to get out of a restart-able read().
3085 * Before we re-do that on its behalf re-enable the signal which was
3086 * blocked by the system when we entered.
3090 sigaddset(&set,sig);
3091 sigprocmask(SIG_UNBLOCK, &set, NULL);
3093 /* Not clear if this will work */
3094 (void)rsignal(sig, SIG_IGN);
3095 (void)rsignal(sig, PL_csighandlerp);
3097 #endif /* !PERL_MICRO */
3101 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3102 PL_savestack_ix = old_ss_ix;
3106 PL_scopestack_ix -= 1;
3109 PL_op = myop; /* Apparently not needed... */
3111 PL_Sv = tSv; /* Restore global temporaries. */
3118 S_restore_magic(pTHX_ const void *p)
3121 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3122 SV* const sv = mgs->mgs_sv;
3127 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3129 #ifdef PERL_OLD_COPY_ON_WRITE
3130 /* While magic was saved (and off) sv_setsv may well have seen
3131 this SV as a prime candidate for COW. */
3133 sv_force_normal_flags(sv, 0);
3136 if (mgs->mgs_readonly)
3138 if (mgs->mgs_magical)
3139 SvFLAGS(sv) |= mgs->mgs_magical;
3142 if (SvGMAGICAL(sv)) {
3143 /* downgrade public flags to private,
3144 and discard any other private flags */
3146 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3148 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3149 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3154 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3156 /* If we're still on top of the stack, pop us off. (That condition
3157 * will be satisfied if restore_magic was called explicitly, but *not*
3158 * if it's being called via leave_scope.)
3159 * The reason for doing this is that otherwise, things like sv_2cv()
3160 * may leave alloc gunk on the savestack, and some code
3161 * (e.g. sighandler) doesn't expect that...
3163 if (PL_savestack_ix == mgs->mgs_ss_ix)
3165 UV popval = SSPOPUV;
3166 assert(popval == SAVEt_DESTRUCTOR_X);
3167 PL_savestack_ix -= 2;
3169 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3170 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3175 /* clean up the mess created by Perl_sighandler().
3176 * Note that this is only called during an exit in a signal handler;
3177 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3178 * skipped over. This is why we don't need to fix up the markstack and
3179 * scopestack - they're going to be set to 0 anyway */
3182 S_unwind_handler_stack(pTHX_ const void *p)
3187 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3191 =for apidoc magic_sethint
3193 Triggered by a store to %^H, records the key/value pair to
3194 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3195 anything that would need a deep copy. Maybe we should warn if we find a
3201 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3204 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3205 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3207 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3209 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3210 an alternative leaf in there, with PL_compiling.cop_hints being used if
3211 it's NULL. If needed for threads, the alternative could lock a mutex,
3212 or take other more complex action. */
3214 /* Something changed in %^H, so it will need to be restored on scope exit.
3215 Doing this here saves a lot of doing it manually in perl code (and
3216 forgetting to do it, and consequent subtle errors. */
3217 PL_hints |= HINT_LOCALIZE_HH;
3218 CopHINTHASH_set(&PL_compiling,
3219 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3224 =for apidoc magic_clearhint
3226 Triggered by a delete from %^H, records the key to
3227 C<PL_compiling.cop_hints_hash>.
3232 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3236 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3237 PERL_UNUSED_ARG(sv);
3239 assert(mg->mg_len == HEf_SVKEY);
3241 PERL_UNUSED_ARG(sv);
3243 PL_hints |= HINT_LOCALIZE_HH;
3244 CopHINTHASH_set(&PL_compiling,
3245 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3246 MUTABLE_SV(mg->mg_ptr), 0, 0));
3251 =for apidoc magic_clearhints
3253 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3258 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3260 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3261 PERL_UNUSED_ARG(sv);
3262 PERL_UNUSED_ARG(mg);
3263 cophh_free(CopHINTHASH_get(&PL_compiling));
3264 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3270 * c-indentation-style: bsd
3272 * indent-tabs-mode: t
3275 * ex: set ts=8 sts=4 sw=4 noet: