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 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
61 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
63 Signal_t Perl_csighandler(int sig);
67 /* Missing protos on LynxOS */
68 void setruid(uid_t id);
69 void seteuid(uid_t id);
70 void setrgid(uid_t id);
71 void setegid(uid_t id);
75 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
83 /* MGS is typedef'ed to struct magic_state in perl.h */
86 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
91 PERL_ARGS_ASSERT_SAVE_MAGIC;
93 assert(SvMAGICAL(sv));
94 /* Turning READONLY off for a copy-on-write scalar (including shared
95 hash keys) is a bad idea. */
97 sv_force_normal_flags(sv, 0);
99 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
101 mgs = SSPTR(mgs_ix, MGS*);
103 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
104 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
108 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
109 /* No public flags are set, so promote any private flags to public. */
110 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
115 =for apidoc mg_magical
117 Turns on the magical status of an SV. See C<sv_magic>.
123 Perl_mg_magical(pTHX_ SV *sv)
126 PERL_ARGS_ASSERT_MG_MAGICAL;
128 if ((mg = SvMAGIC(sv))) {
131 const MGVTBL* const vtbl = mg->mg_virtual;
133 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
140 } while ((mg = mg->mg_moremagic));
141 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
147 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
150 S_is_container_magic(const MAGIC *mg)
153 switch (mg->mg_type) {
156 case PERL_MAGIC_regex_global:
157 case PERL_MAGIC_nkeys:
158 #ifdef USE_LOCALE_COLLATE
159 case PERL_MAGIC_collxfrm:
162 case PERL_MAGIC_taint:
164 case PERL_MAGIC_vstring:
165 case PERL_MAGIC_utf8:
166 case PERL_MAGIC_substr:
167 case PERL_MAGIC_defelem:
168 case PERL_MAGIC_arylen:
170 case PERL_MAGIC_backref:
171 case PERL_MAGIC_arylen_p:
172 case PERL_MAGIC_rhash:
173 case PERL_MAGIC_symtab:
183 Do magic after a value is retrieved from the SV. See C<sv_magic>.
189 Perl_mg_get(pTHX_ SV *sv)
192 const I32 mgs_ix = SSNEW(sizeof(MGS));
193 const bool was_temp = (bool)SvTEMP(sv);
195 MAGIC *newmg, *head, *cur, *mg;
196 /* guard against sv having being freed midway by holding a private
199 PERL_ARGS_ASSERT_MG_GET;
201 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
202 cause the SV's buffer to get stolen (and maybe other stuff).
205 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
210 save_magic(mgs_ix, sv);
212 /* We must call svt_get(sv, mg) for each valid entry in the linked
213 list of magic. svt_get() may delete the current entry, add new
214 magic to the head of the list, or upgrade the SV. AMS 20010810 */
216 newmg = cur = head = mg = SvMAGIC(sv);
218 const MGVTBL * const vtbl = mg->mg_virtual;
220 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
221 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
223 /* guard against magic having been deleted - eg FETCH calling
228 /* Don't restore the flags for this entry if it was deleted. */
229 if (mg->mg_flags & MGf_GSKIP)
230 (SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
233 mg = mg->mg_moremagic;
236 /* Have we finished with the new entries we saw? Start again
237 where we left off (unless there are more new entries). */
245 /* Were any new entries added? */
246 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
253 restore_magic(INT2PTR(void *, (IV)mgs_ix));
255 if (SvREFCNT(sv) == 1) {
256 /* We hold the last reference to this SV, which implies that the
257 SV was deleted as a side effect of the routines we called. */
266 Do magic after a value is assigned to the SV. See C<sv_magic>.
272 Perl_mg_set(pTHX_ SV *sv)
275 const I32 mgs_ix = SSNEW(sizeof(MGS));
279 PERL_ARGS_ASSERT_MG_SET;
281 save_magic(mgs_ix, sv);
283 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
284 const MGVTBL* vtbl = mg->mg_virtual;
285 nextmg = mg->mg_moremagic; /* it may delete itself */
286 if (mg->mg_flags & MGf_GSKIP) {
287 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
288 (SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
290 if (PL_localizing == 2 && !S_is_container_magic(mg))
292 if (vtbl && vtbl->svt_set)
293 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
296 restore_magic(INT2PTR(void*, (IV)mgs_ix));
301 =for apidoc mg_length
303 Report on the SV's length. See C<sv_magic>.
309 Perl_mg_length(pTHX_ SV *sv)
315 PERL_ARGS_ASSERT_MG_LENGTH;
317 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
318 const MGVTBL * const vtbl = mg->mg_virtual;
319 if (vtbl && vtbl->svt_len) {
320 const I32 mgs_ix = SSNEW(sizeof(MGS));
321 save_magic(mgs_ix, sv);
322 /* omit MGf_GSKIP -- not changed here */
323 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
324 restore_magic(INT2PTR(void*, (IV)mgs_ix));
330 /* You can't know whether it's UTF-8 until you get the string again...
332 const U8 *s = (U8*)SvPV_const(sv, len);
335 len = utf8_length(s, s + len);
342 Perl_mg_size(pTHX_ SV *sv)
346 PERL_ARGS_ASSERT_MG_SIZE;
348 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
349 const MGVTBL* const vtbl = mg->mg_virtual;
350 if (vtbl && vtbl->svt_len) {
351 const I32 mgs_ix = SSNEW(sizeof(MGS));
353 save_magic(mgs_ix, sv);
354 /* omit MGf_GSKIP -- not changed here */
355 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
356 restore_magic(INT2PTR(void*, (IV)mgs_ix));
363 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
367 Perl_croak(aTHX_ "Size magic not implemented");
376 Clear something magical that the SV represents. See C<sv_magic>.
382 Perl_mg_clear(pTHX_ SV *sv)
384 const I32 mgs_ix = SSNEW(sizeof(MGS));
388 PERL_ARGS_ASSERT_MG_CLEAR;
390 save_magic(mgs_ix, sv);
392 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
393 const MGVTBL* const vtbl = mg->mg_virtual;
394 /* omit GSKIP -- never set here */
396 nextmg = mg->mg_moremagic; /* it may delete itself */
398 if (vtbl && vtbl->svt_clear)
399 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
402 restore_magic(INT2PTR(void*, (IV)mgs_ix));
409 Finds the magic pointer for type matching the SV. See C<sv_magic>.
415 Perl_mg_find(pTHX_ const SV *sv, int type)
420 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
421 if (mg->mg_type == type)
431 Copies the magic from one SV to another. See C<sv_magic>.
437 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
442 PERL_ARGS_ASSERT_MG_COPY;
444 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
445 const MGVTBL* const vtbl = mg->mg_virtual;
446 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
447 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
450 const char type = mg->mg_type;
451 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
453 (type == PERL_MAGIC_tied)
455 : (type == PERL_MAGIC_regdata && mg->mg_obj)
458 toLOWER(type), key, klen);
467 =for apidoc mg_localize
469 Copy some of the magic from an existing SV to new localized version of that
470 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
473 If setmagic is false then no set magic will be called on the new (empty) SV.
474 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
475 and that will handle the magic.
481 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
486 PERL_ARGS_ASSERT_MG_LOCALIZE;
488 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
489 const MGVTBL* const vtbl = mg->mg_virtual;
490 if (!S_is_container_magic(mg))
493 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
494 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
496 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
497 mg->mg_ptr, mg->mg_len);
499 /* container types should remain read-only across localization */
500 SvFLAGS(nsv) |= SvREADONLY(sv);
503 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
504 SvFLAGS(nsv) |= SvMAGICAL(sv);
516 Free any magic storage used by the SV. See C<sv_magic>.
522 Perl_mg_free(pTHX_ SV *sv)
527 PERL_ARGS_ASSERT_MG_FREE;
529 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
530 const MGVTBL* const vtbl = mg->mg_virtual;
531 moremagic = mg->mg_moremagic;
532 if (vtbl && vtbl->svt_free)
533 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
534 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
535 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
536 Safefree(mg->mg_ptr);
537 else if (mg->mg_len == HEf_SVKEY)
538 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
540 if (mg->mg_flags & MGf_REFCOUNTED)
541 SvREFCNT_dec(mg->mg_obj);
543 SvMAGIC_set(sv, moremagic);
545 SvMAGIC_set(sv, NULL);
553 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
558 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
561 register const REGEXP * const rx = PM_GETRE(PL_curpm);
563 if (mg->mg_obj) { /* @+ */
564 /* return the number possible */
565 return RX_NPARENS(rx);
567 I32 paren = RX_LASTPAREN(rx);
569 /* return the last filled */
571 && (RX_OFFS(rx)[paren].start == -1
572 || RX_OFFS(rx)[paren].end == -1) )
583 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
587 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
590 register const REGEXP * const rx = PM_GETRE(PL_curpm);
592 register const I32 paren = mg->mg_len;
597 if (paren <= (I32)RX_NPARENS(rx) &&
598 (s = RX_OFFS(rx)[paren].start) != -1 &&
599 (t = RX_OFFS(rx)[paren].end) != -1)
602 if (mg->mg_obj) /* @+ */
607 if (i > 0 && RX_MATCH_UTF8(rx)) {
608 const char * const b = RX_SUBBEG(rx);
610 i = utf8_length((U8*)b, (U8*)(b+i));
621 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
623 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
626 Perl_croak(aTHX_ "%s", PL_no_modify);
627 NORETURN_FUNCTION_END;
631 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
636 register const REGEXP * rx;
637 const char * const remaining = mg->mg_ptr + 1;
639 PERL_ARGS_ASSERT_MAGIC_LEN;
641 switch (*mg->mg_ptr) {
643 if (*remaining == '\0') { /* ^P */
645 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
647 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
651 case '\015': /* $^MATCH */
652 if (strEQ(remaining, "ATCH")) {
659 paren = RX_BUFF_IDX_PREMATCH;
663 paren = RX_BUFF_IDX_POSTMATCH;
667 paren = RX_BUFF_IDX_FULLMATCH;
669 case '1': case '2': case '3': case '4':
670 case '5': case '6': case '7': case '8': case '9':
671 paren = atoi(mg->mg_ptr);
673 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
675 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
678 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
681 if (ckWARN(WARN_UNINITIALIZED))
686 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
687 paren = RX_LASTPAREN(rx);
692 case '\016': /* ^N */
693 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
694 paren = RX_LASTCLOSEPAREN(rx);
701 if (!SvPOK(sv) && SvNIOK(sv)) {
709 #define SvRTRIM(sv) STMT_START { \
711 STRLEN len = SvCUR(sv); \
712 char * const p = SvPVX(sv); \
713 while (len > 0 && isSPACE(p[len-1])) \
715 SvCUR_set(sv, len); \
721 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
723 PERL_ARGS_ASSERT_EMULATE_COP_IO;
725 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
726 sv_setsv(sv, &PL_sv_undef);
730 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
731 SV *const value = Perl_refcounted_he_fetch(aTHX_
733 0, "open<", 5, 0, 0);
738 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
739 SV *const value = Perl_refcounted_he_fetch(aTHX_
741 0, "open>", 5, 0, 0);
749 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
753 register char *s = NULL;
755 const char * const remaining = mg->mg_ptr + 1;
756 const char nextchar = *remaining;
758 PERL_ARGS_ASSERT_MAGIC_GET;
760 switch (*mg->mg_ptr) {
761 case '\001': /* ^A */
762 sv_setsv(sv, PL_bodytarget);
764 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
765 if (nextchar == '\0') {
766 sv_setiv(sv, (IV)PL_minus_c);
768 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
769 sv_setiv(sv, (IV)STATUS_NATIVE);
773 case '\004': /* ^D */
774 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
776 case '\005': /* ^E */
777 if (nextchar == '\0') {
780 # include <descrip.h>
781 # include <starlet.h>
783 $DESCRIPTOR(msgdsc,msg);
784 sv_setnv(sv,(NV) vaxc$errno);
785 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
786 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
791 if (!(_emx_env & 0x200)) { /* Under DOS */
792 sv_setnv(sv, (NV)errno);
793 sv_setpv(sv, errno ? Strerror(errno) : "");
795 if (errno != errno_isOS2) {
796 const int tmp = _syserrno();
797 if (tmp) /* 2nd call to _syserrno() makes it 0 */
800 sv_setnv(sv, (NV)Perl_rc);
801 sv_setpv(sv, os2error(Perl_rc));
805 const DWORD dwErr = GetLastError();
806 sv_setnv(sv, (NV)dwErr);
808 PerlProc_GetOSError(sv, dwErr);
817 sv_setnv(sv, (NV)errno);
818 sv_setpv(sv, errno ? Strerror(errno) : "");
823 SvNOK_on(sv); /* what a wonderful hack! */
825 else if (strEQ(remaining, "NCODING"))
826 sv_setsv(sv, PL_encoding);
828 case '\006': /* ^F */
829 sv_setiv(sv, (IV)PL_maxsysfd);
831 case '\010': /* ^H */
832 sv_setiv(sv, (IV)PL_hints);
834 case '\011': /* ^I */ /* NOT \t in EBCDIC */
835 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
837 case '\017': /* ^O & ^OPEN */
838 if (nextchar == '\0') {
839 sv_setpv(sv, PL_osname);
842 else if (strEQ(remaining, "PEN")) {
843 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
847 if (nextchar == '\0') { /* ^P */
848 sv_setiv(sv, (IV)PL_perldb);
849 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
850 goto do_prematch_fetch;
851 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
852 goto do_postmatch_fetch;
855 case '\023': /* ^S */
856 if (nextchar == '\0') {
857 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
860 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
865 case '\024': /* ^T */
866 if (nextchar == '\0') {
868 sv_setnv(sv, PL_basetime);
870 sv_setiv(sv, (IV)PL_basetime);
873 else if (strEQ(remaining, "AINT"))
874 sv_setiv(sv, PL_tainting
875 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
878 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
879 if (strEQ(remaining, "NICODE"))
880 sv_setuv(sv, (UV) PL_unicode);
881 else if (strEQ(remaining, "TF8LOCALE"))
882 sv_setuv(sv, (UV) PL_utf8locale);
883 else if (strEQ(remaining, "TF8CACHE"))
884 sv_setiv(sv, (IV) PL_utf8cache);
886 case '\027': /* ^W & $^WARNING_BITS */
887 if (nextchar == '\0')
888 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
889 else if (strEQ(remaining, "ARNING_BITS")) {
890 if (PL_compiling.cop_warnings == pWARN_NONE) {
891 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
893 else if (PL_compiling.cop_warnings == pWARN_STD) {
896 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
900 else if (PL_compiling.cop_warnings == pWARN_ALL) {
901 /* Get the bit mask for $warnings::Bits{all}, because
902 * it could have been extended by warnings::register */
903 HV * const bits=get_hv("warnings::Bits", 0);
905 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
907 sv_setsv(sv, *bits_all);
910 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
914 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
915 *PL_compiling.cop_warnings);
920 case '\015': /* $^MATCH */
921 if (strEQ(remaining, "ATCH")) {
922 case '1': case '2': case '3': case '4':
923 case '5': case '6': case '7': case '8': case '9': case '&':
924 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
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); /* $& is in [0] */
930 CALLREG_NUMBUF_FETCH(rx,paren,sv);
933 sv_setsv(sv,&PL_sv_undef);
937 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
938 if (RX_LASTPAREN(rx)) {
939 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
943 sv_setsv(sv,&PL_sv_undef);
945 case '\016': /* ^N */
946 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
947 if (RX_LASTCLOSEPAREN(rx)) {
948 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
953 sv_setsv(sv,&PL_sv_undef);
957 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
958 CALLREG_NUMBUF_FETCH(rx,-2,sv);
961 sv_setsv(sv,&PL_sv_undef);
965 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
966 CALLREG_NUMBUF_FETCH(rx,-1,sv);
969 sv_setsv(sv,&PL_sv_undef);
972 if (GvIO(PL_last_in_gv)) {
973 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
978 sv_setiv(sv, (IV)STATUS_CURRENT);
979 #ifdef COMPLEX_STATUS
980 SvUPGRADE(sv, SVt_PVLV);
981 LvTARGOFF(sv) = PL_statusvalue;
982 LvTARGLEN(sv) = PL_statusvalue_vms;
987 if (GvIOp(PL_defoutgv))
988 s = IoTOP_NAME(GvIOp(PL_defoutgv));
992 sv_setpv(sv,GvENAME(PL_defoutgv));
993 sv_catpvs(sv,"_TOP");
997 if (GvIOp(PL_defoutgv))
998 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1000 s = GvENAME(PL_defoutgv);
1004 if (GvIOp(PL_defoutgv))
1005 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1008 if (GvIOp(PL_defoutgv))
1009 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1012 if (GvIOp(PL_defoutgv))
1013 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1020 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1023 if (GvIOp(PL_defoutgv))
1024 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1028 sv_copypv(sv, PL_ors_sv);
1032 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1033 sv_setpv(sv, errno ? Strerror(errno) : "");
1037 sv_setnv(sv, (NV)errno);
1039 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1040 sv_setpv(sv, os2error(Perl_rc));
1043 sv_setpv(sv, errno ? Strerror(errno) : "");
1048 SvNOK_on(sv); /* what a wonderful hack! */
1051 sv_setiv(sv, (IV)PL_uid);
1054 sv_setiv(sv, (IV)PL_euid);
1057 sv_setiv(sv, (IV)PL_gid);
1060 sv_setiv(sv, (IV)PL_egid);
1062 #ifdef HAS_GETGROUPS
1064 Groups_t *gary = NULL;
1065 I32 i, num_groups = getgroups(0, gary);
1066 Newx(gary, num_groups, Groups_t);
1067 num_groups = getgroups(num_groups, gary);
1068 for (i = 0; i < num_groups; i++)
1069 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1072 (void)SvIOK_on(sv); /* what a wonderful hack! */
1082 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1084 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1086 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1088 if (uf && uf->uf_val)
1089 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1094 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1097 STRLEN len = 0, klen;
1098 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1099 const char * const ptr = MgPV_const(mg,klen);
1102 PERL_ARGS_ASSERT_MAGIC_SETENV;
1104 #ifdef DYNAMIC_ENV_FETCH
1105 /* We just undefd an environment var. Is a replacement */
1106 /* waiting in the wings? */
1108 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1110 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1114 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1115 /* And you'll never guess what the dog had */
1116 /* in its mouth... */
1118 MgTAINTEDDIR_off(mg);
1120 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1121 char pathbuf[256], eltbuf[256], *cp, *elt;
1125 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1127 do { /* DCL$PATH may be a search list */
1128 while (1) { /* as may dev portion of any element */
1129 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1130 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1131 cando_by_name(S_IWUSR,0,elt) ) {
1132 MgTAINTEDDIR_on(mg);
1136 if ((cp = strchr(elt, ':')) != NULL)
1138 if (my_trnlnm(elt, eltbuf, j++))
1144 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1147 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1148 const char * const strend = s + len;
1150 while (s < strend) {
1154 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1155 const char path_sep = '|';
1157 const char path_sep = ':';
1159 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1160 s, strend, path_sep, &i);
1162 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1164 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1166 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1168 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1169 MgTAINTEDDIR_on(mg);
1175 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1181 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1183 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1184 PERL_UNUSED_ARG(sv);
1185 my_setenv(MgPV_nolen_const(mg),NULL);
1190 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1193 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1194 PERL_UNUSED_ARG(mg);
1196 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1198 if (PL_localizing) {
1201 hv_iterinit(MUTABLE_HV(sv));
1202 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1204 my_setenv(hv_iterkey(entry, &keylen),
1205 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1213 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1216 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1217 PERL_UNUSED_ARG(sv);
1218 PERL_UNUSED_ARG(mg);
1220 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1228 #ifdef HAS_SIGPROCMASK
1230 restore_sigmask(pTHX_ SV *save_sv)
1232 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1233 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1237 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1240 /* Are we fetching a signal entry? */
1241 int i = (I16)mg->mg_private;
1243 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1246 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1251 sv_setsv(sv,PL_psig_ptr[i]);
1253 Sighandler_t sigstate = rsignal_state(i);
1254 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1255 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1258 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1259 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1262 /* cache state so we don't fetch it again */
1263 if(sigstate == (Sighandler_t) SIG_IGN)
1264 sv_setpvs(sv,"IGNORE");
1266 sv_setsv(sv,&PL_sv_undef);
1267 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1274 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1276 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1277 PERL_UNUSED_ARG(sv);
1279 magic_setsig(NULL, mg);
1280 return sv_unmagic(sv, mg->mg_type);
1284 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1285 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1287 Perl_csighandler(int sig)
1290 #ifdef PERL_GET_SIG_CONTEXT
1291 dTHXa(PERL_GET_SIG_CONTEXT);
1295 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1296 (void) rsignal(sig, PL_csighandlerp);
1297 if (PL_sig_ignoring[sig]) return;
1299 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1300 if (PL_sig_defaulting[sig])
1301 #ifdef KILL_BY_SIGPRC
1302 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1317 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1318 /* Call the perl level handler now--
1319 * with risk we may be in malloc() etc. */
1320 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1321 (*PL_sighandlerp)(sig, NULL, NULL);
1323 (*PL_sighandlerp)(sig);
1326 /* Set a flag to say this signal is pending, that is awaiting delivery after
1327 * the current Perl opcode completes */
1328 PL_psig_pend[sig]++;
1330 #ifndef SIG_PENDING_DIE_COUNT
1331 # define SIG_PENDING_DIE_COUNT 120
1333 /* And one to say _a_ signal is pending */
1334 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1335 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1336 (unsigned long)SIG_PENDING_DIE_COUNT);
1340 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1342 Perl_csighandler_init(void)
1345 if (PL_sig_handlers_initted) return;
1347 for (sig = 1; sig < SIG_SIZE; sig++) {
1348 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1350 PL_sig_defaulting[sig] = 1;
1351 (void) rsignal(sig, PL_csighandlerp);
1353 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1354 PL_sig_ignoring[sig] = 0;
1357 PL_sig_handlers_initted = 1;
1362 Perl_despatch_signals(pTHX)
1367 for (sig = 1; sig < SIG_SIZE; sig++) {
1368 if (PL_psig_pend[sig]) {
1369 PERL_BLOCKSIG_ADD(set, sig);
1370 PL_psig_pend[sig] = 0;
1371 PERL_BLOCKSIG_BLOCK(set);
1372 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1373 (*PL_sighandlerp)(sig, NULL, NULL);
1375 (*PL_sighandlerp)(sig);
1377 PERL_BLOCKSIG_UNBLOCK(set);
1382 /* sv of NULL signifies that we're acting as magic_clearsig. */
1384 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1389 /* Need to be careful with SvREFCNT_dec(), because that can have side
1390 * effects (due to closures). We must make sure that the new disposition
1391 * is in place before it is called.
1395 #ifdef HAS_SIGPROCMASK
1399 register const char *s = MgPV_const(mg,len);
1401 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1404 if (strEQ(s,"__DIE__"))
1406 else if (strEQ(s,"__WARN__")
1407 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1408 /* Merge the existing behaviours, which are as follows:
1409 magic_setsig, we always set svp to &PL_warnhook
1410 (hence we always change the warnings handler)
1411 For magic_clearsig, we don't change the warnings handler if it's
1412 set to the &PL_warnhook. */
1415 Perl_croak(aTHX_ "No such hook: %s", s);
1418 if (*svp != PERL_WARNHOOK_FATAL)
1424 i = (I16)mg->mg_private;
1426 mg->mg_private = i = whichsig(s); /* ...no, a brick */
1429 if (sv && ckWARN(WARN_SIGNAL))
1430 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1433 #ifdef HAS_SIGPROCMASK
1434 /* Avoid having the signal arrive at a bad time, if possible. */
1437 sigprocmask(SIG_BLOCK, &set, &save);
1439 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1440 SAVEFREESV(save_sv);
1441 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1444 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1445 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1447 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1448 PL_sig_ignoring[i] = 0;
1450 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1451 PL_sig_defaulting[i] = 0;
1453 to_dec = PL_psig_ptr[i];
1455 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1456 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1458 /* Signals don't change name during the program's execution, so once
1459 they're cached in the appropriate slot of PL_psig_name, they can
1462 Ideally we'd find some way of making SVs at (C) compile time, or
1463 at least, doing most of the work. */
1464 if (!PL_psig_name[i]) {
1465 PL_psig_name[i] = newSVpvn(s, len);
1466 SvREADONLY_on(PL_psig_name[i]);
1469 SvREFCNT_dec(PL_psig_name[i]);
1470 PL_psig_name[i] = NULL;
1471 PL_psig_ptr[i] = NULL;
1474 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1476 (void)rsignal(i, PL_csighandlerp);
1479 *svp = SvREFCNT_inc_simple_NN(sv);
1481 if (sv && SvOK(sv)) {
1482 s = SvPV_force(sv, len);
1486 if (sv && strEQ(s,"IGNORE")) {
1488 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1489 PL_sig_ignoring[i] = 1;
1490 (void)rsignal(i, PL_csighandlerp);
1492 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1496 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1498 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1499 PL_sig_defaulting[i] = 1;
1500 (void)rsignal(i, PL_csighandlerp);
1502 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1508 * We should warn if HINT_STRICT_REFS, but without
1509 * access to a known hint bit in a known OP, we can't
1510 * tell whether HINT_STRICT_REFS is in force or not.
1512 if (!strchr(s,':') && !strchr(s,'\''))
1513 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1516 (void)rsignal(i, PL_csighandlerp);
1518 *svp = SvREFCNT_inc_simple_NN(sv);
1522 #ifdef HAS_SIGPROCMASK
1527 SvREFCNT_dec(to_dec);
1530 #endif /* !PERL_MICRO */
1533 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1536 PERL_ARGS_ASSERT_MAGIC_SETISA;
1537 PERL_UNUSED_ARG(sv);
1539 /* Skip _isaelem because _isa will handle it shortly */
1540 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1543 return magic_clearisa(NULL, mg);
1546 /* sv of NULL signifies that we're acting as magic_setisa. */
1548 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1553 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1555 /* Bail out if destruction is going on */
1556 if(PL_dirty) return 0;
1559 av_clear(MUTABLE_AV(sv));
1561 /* XXX Once it's possible, we need to
1562 detect that our @ISA is aliased in
1563 other stashes, and act on the stashes
1564 of all of the aliases */
1566 /* The first case occurs via setisa,
1567 the second via setisa_elem, which
1568 calls this same magic */
1570 SvTYPE(mg->mg_obj) == SVt_PVGV
1571 ? (const GV *)mg->mg_obj
1572 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1576 mro_isa_changed_in(stash);
1582 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1585 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1586 PERL_UNUSED_ARG(sv);
1587 PERL_UNUSED_ARG(mg);
1588 PL_amagic_generation++;
1594 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1596 HV * const hv = MUTABLE_HV(LvTARG(sv));
1599 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1600 PERL_UNUSED_ARG(mg);
1603 (void) hv_iterinit(hv);
1604 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1607 while (hv_iternext(hv))
1612 sv_setiv(sv, (IV)i);
1617 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1619 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1620 PERL_UNUSED_ARG(mg);
1622 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1627 /* caller is responsible for stack switching/cleanup */
1629 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1634 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1638 PUSHs(SvTIED_obj(sv, mg));
1641 if (mg->mg_len >= 0)
1642 mPUSHp(mg->mg_ptr, mg->mg_len);
1643 else if (mg->mg_len == HEf_SVKEY)
1644 PUSHs(MUTABLE_SV(mg->mg_ptr));
1646 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1655 return call_method(meth, flags);
1659 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1663 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1667 PUSHSTACKi(PERLSI_MAGIC);
1669 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1670 sv_setsv(sv, *PL_stack_sp--);
1680 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1682 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1685 mg->mg_flags |= MGf_GSKIP;
1686 magic_methpack(sv,mg,"FETCH");
1691 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1695 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1698 PUSHSTACKi(PERLSI_MAGIC);
1699 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1706 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1708 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1710 return magic_methpack(sv,mg,"DELETE");
1715 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1720 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1724 PUSHSTACKi(PERLSI_MAGIC);
1725 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1726 sv = *PL_stack_sp--;
1727 retval = SvIV(sv)-1;
1729 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1734 return (U32) retval;
1738 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1742 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1745 PUSHSTACKi(PERLSI_MAGIC);
1747 XPUSHs(SvTIED_obj(sv, mg));
1749 call_method("CLEAR", G_SCALAR|G_DISCARD);
1757 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1760 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1762 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1766 PUSHSTACKi(PERLSI_MAGIC);
1769 PUSHs(SvTIED_obj(sv, mg));
1774 if (call_method(meth, G_SCALAR))
1775 sv_setsv(key, *PL_stack_sp--);
1784 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1786 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1788 return magic_methpack(sv,mg,"EXISTS");
1792 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1796 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1797 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1799 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1801 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1803 if (HvEITER_get(hv))
1804 /* we are in an iteration so the hash cannot be empty */
1806 /* no xhv_eiter so now use FIRSTKEY */
1807 key = sv_newmortal();
1808 magic_nextpack(MUTABLE_SV(hv), mg, key);
1809 HvEITER_set(hv, NULL); /* need to reset iterator */
1810 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1813 /* there is a SCALAR method that we can call */
1815 PUSHSTACKi(PERLSI_MAGIC);
1821 if (call_method("SCALAR", G_SCALAR))
1822 retval = *PL_stack_sp--;
1824 retval = &PL_sv_undef;
1831 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1834 GV * const gv = PL_DBline;
1835 const I32 i = SvTRUE(sv);
1836 SV ** const svp = av_fetch(GvAV(gv),
1837 atoi(MgPV_nolen_const(mg)), FALSE);
1839 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1841 if (svp && SvIOKp(*svp)) {
1842 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1844 /* set or clear breakpoint in the relevant control op */
1846 o->op_flags |= OPf_SPECIAL;
1848 o->op_flags &= ~OPf_SPECIAL;
1855 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1858 AV * const obj = MUTABLE_AV(mg->mg_obj);
1860 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1863 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1871 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1874 AV * const obj = MUTABLE_AV(mg->mg_obj);
1876 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1879 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1881 if (ckWARN(WARN_MISC))
1882 Perl_warner(aTHX_ packWARN(WARN_MISC),
1883 "Attempt to set length of freed array");
1889 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1893 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1894 PERL_UNUSED_ARG(sv);
1896 /* during global destruction, mg_obj may already have been freed */
1897 if (PL_in_clean_all)
1900 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1903 /* arylen scalar holds a pointer back to the array, but doesn't own a
1904 reference. Hence the we (the array) are about to go away with it
1905 still pointing at us. Clear its pointer, else it would be pointing
1906 at free memory. See the comment in sv_magic about reference loops,
1907 and why it can't own a reference to us. */
1914 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1917 SV* const lsv = LvTARG(sv);
1919 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1920 PERL_UNUSED_ARG(mg);
1922 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1923 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1924 if (found && found->mg_len >= 0) {
1925 I32 i = found->mg_len;
1927 sv_pos_b2u(lsv, &i);
1928 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1937 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1940 SV* const lsv = LvTARG(sv);
1946 PERL_ARGS_ASSERT_MAGIC_SETPOS;
1947 PERL_UNUSED_ARG(mg);
1949 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1950 found = mg_find(lsv, PERL_MAGIC_regex_global);
1956 #ifdef PERL_OLD_COPY_ON_WRITE
1958 sv_force_normal_flags(lsv, 0);
1960 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
1963 else if (!SvOK(sv)) {
1967 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1969 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
1972 ulen = sv_len_utf8(lsv);
1982 else if (pos > (SSize_t)len)
1987 sv_pos_u2b(lsv, &p, 0);
1991 found->mg_len = pos;
1992 found->mg_flags &= ~MGf_MINMATCH;
1998 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2001 SV * const lsv = LvTARG(sv);
2002 const char * const tmps = SvPV_const(lsv,len);
2003 I32 offs = LvTARGOFF(sv);
2004 I32 rem = LvTARGLEN(sv);
2006 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2007 PERL_UNUSED_ARG(mg);
2010 sv_pos_u2b(lsv, &offs, &rem);
2011 if (offs > (I32)len)
2013 if (rem + offs > (I32)len)
2015 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2022 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2026 const char * const tmps = SvPV_const(sv, len);
2027 SV * const lsv = LvTARG(sv);
2028 I32 lvoff = LvTARGOFF(sv);
2029 I32 lvlen = LvTARGLEN(sv);
2031 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2032 PERL_UNUSED_ARG(mg);
2035 sv_utf8_upgrade(lsv);
2036 sv_pos_u2b(lsv, &lvoff, &lvlen);
2037 sv_insert(lsv, lvoff, lvlen, tmps, len);
2038 LvTARGLEN(sv) = sv_len_utf8(sv);
2041 else if (lsv && SvUTF8(lsv)) {
2043 sv_pos_u2b(lsv, &lvoff, &lvlen);
2044 LvTARGLEN(sv) = len;
2045 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2046 sv_insert(lsv, lvoff, lvlen, utf8, len);
2050 sv_insert(lsv, lvoff, lvlen, tmps, len);
2051 LvTARGLEN(sv) = len;
2059 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2063 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2064 PERL_UNUSED_ARG(sv);
2066 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2071 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2075 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2076 PERL_UNUSED_ARG(sv);
2078 /* update taint status */
2087 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2089 SV * const lsv = LvTARG(sv);
2091 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2092 PERL_UNUSED_ARG(mg);
2095 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2103 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2105 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2106 PERL_UNUSED_ARG(mg);
2107 do_vecset(sv); /* XXX slurp this routine */
2112 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2117 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2119 if (LvTARGLEN(sv)) {
2121 SV * const ahv = LvTARG(sv);
2122 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2127 AV *const av = MUTABLE_AV(LvTARG(sv));
2128 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2129 targ = AvARRAY(av)[LvTARGOFF(sv)];
2131 if (targ && (targ != &PL_sv_undef)) {
2132 /* somebody else defined it for us */
2133 SvREFCNT_dec(LvTARG(sv));
2134 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2136 SvREFCNT_dec(mg->mg_obj);
2138 mg->mg_flags &= ~MGf_REFCOUNTED;
2143 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2148 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2150 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2151 PERL_UNUSED_ARG(mg);
2155 sv_setsv(LvTARG(sv), sv);
2156 SvSETMAGIC(LvTARG(sv));
2162 Perl_vivify_defelem(pTHX_ SV *sv)
2168 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2170 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2173 SV * const ahv = LvTARG(sv);
2174 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2177 if (!value || value == &PL_sv_undef)
2178 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2181 AV *const av = MUTABLE_AV(LvTARG(sv));
2182 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2183 LvTARG(sv) = NULL; /* array can't be extended */
2185 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2186 if (!svp || (value = *svp) == &PL_sv_undef)
2187 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2190 SvREFCNT_inc_simple_void(value);
2191 SvREFCNT_dec(LvTARG(sv));
2194 SvREFCNT_dec(mg->mg_obj);
2196 mg->mg_flags &= ~MGf_REFCOUNTED;
2200 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2202 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2203 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2207 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2209 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2210 PERL_UNUSED_CONTEXT;
2217 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2219 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2221 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2223 if (uf && uf->uf_set)
2224 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2229 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2231 const char type = mg->mg_type;
2233 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2235 if (type == PERL_MAGIC_qr) {
2236 } else if (type == PERL_MAGIC_bm) {
2240 assert(type == PERL_MAGIC_fm);
2243 return sv_unmagic(sv, type);
2246 #ifdef USE_LOCALE_COLLATE
2248 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2250 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2253 * RenE<eacute> Descartes said "I think not."
2254 * and vanished with a faint plop.
2256 PERL_UNUSED_CONTEXT;
2257 PERL_UNUSED_ARG(sv);
2259 Safefree(mg->mg_ptr);
2265 #endif /* USE_LOCALE_COLLATE */
2267 /* Just clear the UTF-8 cache data. */
2269 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2271 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2272 PERL_UNUSED_CONTEXT;
2273 PERL_UNUSED_ARG(sv);
2274 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2276 mg->mg_len = -1; /* The mg_len holds the len cache. */
2281 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2284 register const char *s;
2286 register const REGEXP * rx;
2287 const char * const remaining = mg->mg_ptr + 1;
2291 PERL_ARGS_ASSERT_MAGIC_SET;
2293 switch (*mg->mg_ptr) {
2294 case '\015': /* $^MATCH */
2295 if (strEQ(remaining, "ATCH"))
2297 case '`': /* ${^PREMATCH} caught below */
2299 paren = RX_BUFF_IDX_PREMATCH;
2301 case '\'': /* ${^POSTMATCH} caught below */
2303 paren = RX_BUFF_IDX_POSTMATCH;
2307 paren = RX_BUFF_IDX_FULLMATCH;
2309 case '1': case '2': case '3': case '4':
2310 case '5': case '6': case '7': case '8': case '9':
2311 paren = atoi(mg->mg_ptr);
2313 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2314 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2317 /* Croak with a READONLY error when a numbered match var is
2318 * set without a previous pattern match. Unless it's C<local $1>
2320 if (!PL_localizing) {
2321 Perl_croak(aTHX_ "%s", PL_no_modify);
2324 case '\001': /* ^A */
2325 sv_setsv(PL_bodytarget, sv);
2327 case '\003': /* ^C */
2328 PL_minus_c = (bool)SvIV(sv);
2331 case '\004': /* ^D */
2333 s = SvPV_nolen_const(sv);
2334 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2335 DEBUG_x(dump_all());
2337 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2340 case '\005': /* ^E */
2341 if (*(mg->mg_ptr+1) == '\0') {
2343 set_vaxc_errno(SvIV(sv));
2346 SetLastError( SvIV(sv) );
2349 os2_setsyserrno(SvIV(sv));
2351 /* will anyone ever use this? */
2352 SETERRNO(SvIV(sv), 4);
2357 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2359 SvREFCNT_dec(PL_encoding);
2360 if (SvOK(sv) || SvGMAGICAL(sv)) {
2361 PL_encoding = newSVsv(sv);
2368 case '\006': /* ^F */
2369 PL_maxsysfd = SvIV(sv);
2371 case '\010': /* ^H */
2372 PL_hints = SvIV(sv);
2374 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2375 Safefree(PL_inplace);
2376 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2378 case '\017': /* ^O */
2379 if (*(mg->mg_ptr+1) == '\0') {
2380 Safefree(PL_osname);
2383 TAINT_PROPER("assigning to $^O");
2384 PL_osname = savesvpv(sv);
2387 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2389 const char *const start = SvPV(sv, len);
2390 const char *out = (const char*)memchr(start, '\0', len);
2392 struct refcounted_he *tmp_he;
2395 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2397 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2399 /* Opening for input is more common than opening for output, so
2400 ensure that hints for input are sooner on linked list. */
2401 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2402 SVs_TEMP | SvUTF8(sv))
2403 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
2406 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2407 newSVpvs_flags("open>", SVs_TEMP),
2410 /* The UTF-8 setting is carried over */
2411 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2413 PL_compiling.cop_hints_hash
2414 = Perl_refcounted_he_new(aTHX_ tmp_he,
2415 newSVpvs_flags("open<", SVs_TEMP),
2419 case '\020': /* ^P */
2420 if (*remaining == '\0') { /* ^P */
2421 PL_perldb = SvIV(sv);
2422 if (PL_perldb && !PL_DBsingle)
2425 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2427 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2430 case '\024': /* ^T */
2432 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2434 PL_basetime = (Time_t)SvIV(sv);
2437 case '\025': /* ^UTF8CACHE */
2438 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2439 PL_utf8cache = (signed char) sv_2iv(sv);
2442 case '\027': /* ^W & $^WARNING_BITS */
2443 if (*(mg->mg_ptr+1) == '\0') {
2444 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2446 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2447 | (i ? G_WARN_ON : G_WARN_OFF) ;
2450 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2451 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2452 if (!SvPOK(sv) && PL_localizing) {
2453 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2454 PL_compiling.cop_warnings = pWARN_NONE;
2459 int accumulate = 0 ;
2460 int any_fatals = 0 ;
2461 const char * const ptr = SvPV_const(sv, len) ;
2462 for (i = 0 ; i < len ; ++i) {
2463 accumulate |= ptr[i] ;
2464 any_fatals |= (ptr[i] & 0xAA) ;
2467 if (!specialWARN(PL_compiling.cop_warnings))
2468 PerlMemShared_free(PL_compiling.cop_warnings);
2469 PL_compiling.cop_warnings = pWARN_NONE;
2471 /* Yuck. I can't see how to abstract this: */
2472 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2473 WARN_ALL) && !any_fatals) {
2474 if (!specialWARN(PL_compiling.cop_warnings))
2475 PerlMemShared_free(PL_compiling.cop_warnings);
2476 PL_compiling.cop_warnings = pWARN_ALL;
2477 PL_dowarn |= G_WARN_ONCE ;
2481 const char *const p = SvPV_const(sv, len);
2483 PL_compiling.cop_warnings
2484 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2487 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2488 PL_dowarn |= G_WARN_ONCE ;
2496 if (PL_localizing) {
2497 if (PL_localizing == 1)
2498 SAVESPTR(PL_last_in_gv);
2500 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2501 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2504 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2505 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2506 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2509 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2510 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2511 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2514 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2517 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2518 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2519 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2522 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2526 IO * const io = GvIOp(PL_defoutgv);
2529 if ((SvIV(sv)) == 0)
2530 IoFLAGS(io) &= ~IOf_FLUSH;
2532 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2533 PerlIO *ofp = IoOFP(io);
2535 (void)PerlIO_flush(ofp);
2536 IoFLAGS(io) |= IOf_FLUSH;
2542 SvREFCNT_dec(PL_rs);
2543 PL_rs = newSVsv(sv);
2547 SvREFCNT_dec(PL_ors_sv);
2548 if (SvOK(sv) || SvGMAGICAL(sv)) {
2549 PL_ors_sv = newSVsv(sv);
2556 CopARYBASE_set(&PL_compiling, SvIV(sv));
2559 #ifdef COMPLEX_STATUS
2560 if (PL_localizing == 2) {
2561 SvUPGRADE(sv, SVt_PVLV);
2562 PL_statusvalue = LvTARGOFF(sv);
2563 PL_statusvalue_vms = LvTARGLEN(sv);
2567 #ifdef VMSISH_STATUS
2569 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2572 STATUS_UNIX_EXIT_SET(SvIV(sv));
2577 # define PERL_VMS_BANG vaxc$errno
2579 # define PERL_VMS_BANG 0
2581 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2582 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2587 if (PL_delaymagic) {
2588 PL_delaymagic |= DM_RUID;
2589 break; /* don't do magic till later */
2592 (void)setruid((Uid_t)PL_uid);
2595 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2597 #ifdef HAS_SETRESUID
2598 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2600 if (PL_uid == PL_euid) { /* special case $< = $> */
2602 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2603 if (PL_uid != 0 && PerlProc_getuid() == 0)
2604 (void)PerlProc_setuid(0);
2606 (void)PerlProc_setuid(PL_uid);
2608 PL_uid = PerlProc_getuid();
2609 Perl_croak(aTHX_ "setruid() not implemented");
2614 PL_uid = PerlProc_getuid();
2615 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2619 if (PL_delaymagic) {
2620 PL_delaymagic |= DM_EUID;
2621 break; /* don't do magic till later */
2624 (void)seteuid((Uid_t)PL_euid);
2627 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2629 #ifdef HAS_SETRESUID
2630 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2632 if (PL_euid == PL_uid) /* special case $> = $< */
2633 PerlProc_setuid(PL_euid);
2635 PL_euid = PerlProc_geteuid();
2636 Perl_croak(aTHX_ "seteuid() not implemented");
2641 PL_euid = PerlProc_geteuid();
2642 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2646 if (PL_delaymagic) {
2647 PL_delaymagic |= DM_RGID;
2648 break; /* don't do magic till later */
2651 (void)setrgid((Gid_t)PL_gid);
2654 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2656 #ifdef HAS_SETRESGID
2657 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2659 if (PL_gid == PL_egid) /* special case $( = $) */
2660 (void)PerlProc_setgid(PL_gid);
2662 PL_gid = PerlProc_getgid();
2663 Perl_croak(aTHX_ "setrgid() not implemented");
2668 PL_gid = PerlProc_getgid();
2669 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2672 #ifdef HAS_SETGROUPS
2674 const char *p = SvPV_const(sv, len);
2675 Groups_t *gary = NULL;
2680 for (i = 0; i < NGROUPS; ++i) {
2681 while (*p && !isSPACE(*p))
2688 Newx(gary, i + 1, Groups_t);
2690 Renew(gary, i + 1, Groups_t);
2694 (void)setgroups(i, gary);
2697 #else /* HAS_SETGROUPS */
2699 #endif /* HAS_SETGROUPS */
2700 if (PL_delaymagic) {
2701 PL_delaymagic |= DM_EGID;
2702 break; /* don't do magic till later */
2705 (void)setegid((Gid_t)PL_egid);
2708 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2710 #ifdef HAS_SETRESGID
2711 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2713 if (PL_egid == PL_gid) /* special case $) = $( */
2714 (void)PerlProc_setgid(PL_egid);
2716 PL_egid = PerlProc_getegid();
2717 Perl_croak(aTHX_ "setegid() not implemented");
2722 PL_egid = PerlProc_getegid();
2723 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2726 PL_chopset = SvPV_force(sv,len);
2729 LOCK_DOLLARZERO_MUTEX;
2730 #ifdef HAS_SETPROCTITLE
2731 /* The BSDs don't show the argv[] in ps(1) output, they
2732 * show a string from the process struct and provide
2733 * the setproctitle() routine to manipulate that. */
2734 if (PL_origalen != 1) {
2735 s = SvPV_const(sv, len);
2736 # if __FreeBSD_version > 410001
2737 /* The leading "-" removes the "perl: " prefix,
2738 * but not the "(perl) suffix from the ps(1)
2739 * output, because that's what ps(1) shows if the
2740 * argv[] is modified. */
2741 setproctitle("-%s", s);
2742 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2743 /* This doesn't really work if you assume that
2744 * $0 = 'foobar'; will wipe out 'perl' from the $0
2745 * because in ps(1) output the result will be like
2746 * sprintf("perl: %s (perl)", s)
2747 * I guess this is a security feature:
2748 * one (a user process) cannot get rid of the original name.
2750 setproctitle("%s", s);
2753 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2754 if (PL_origalen != 1) {
2756 s = SvPV_const(sv, len);
2757 un.pst_command = (char *)s;
2758 pstat(PSTAT_SETCMD, un, len, 0, 0);
2761 if (PL_origalen > 1) {
2762 /* PL_origalen is set in perl_parse(). */
2763 s = SvPV_force(sv,len);
2764 if (len >= (STRLEN)PL_origalen-1) {
2765 /* Longer than original, will be truncated. We assume that
2766 * PL_origalen bytes are available. */
2767 Copy(s, PL_origargv[0], PL_origalen-1, char);
2770 /* Shorter than original, will be padded. */
2772 /* Special case for Mac OS X: see [perl #38868] */
2775 /* Is the space counterintuitive? Yes.
2776 * (You were expecting \0?)
2777 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2779 const int pad = ' ';
2781 Copy(s, PL_origargv[0], len, char);
2782 PL_origargv[0][len] = 0;
2783 memset(PL_origargv[0] + len + 1,
2784 pad, PL_origalen - len - 1);
2786 PL_origargv[0][PL_origalen-1] = 0;
2787 for (i = 1; i < PL_origargc; i++)
2791 UNLOCK_DOLLARZERO_MUTEX;
2798 Perl_whichsig(pTHX_ const char *sig)
2800 register char* const* sigv;
2802 PERL_ARGS_ASSERT_WHICHSIG;
2803 PERL_UNUSED_CONTEXT;
2805 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2806 if (strEQ(sig,*sigv))
2807 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2809 if (strEQ(sig,"CHLD"))
2813 if (strEQ(sig,"CLD"))
2820 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2821 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2823 Perl_sighandler(int sig)
2826 #ifdef PERL_GET_SIG_CONTEXT
2827 dTHXa(PERL_GET_SIG_CONTEXT);
2834 SV * const tSv = PL_Sv;
2838 XPV * const tXpv = PL_Xpv;
2840 if (PL_savestack_ix + 15 <= PL_savestack_max)
2842 if (PL_markstack_ptr < PL_markstack_max - 2)
2844 if (PL_scopestack_ix < PL_scopestack_max - 3)
2847 if (!PL_psig_ptr[sig]) {
2848 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2853 /* Max number of items pushed there is 3*n or 4. We cannot fix
2854 infinity, so we fix 4 (in fact 5): */
2856 PL_savestack_ix += 5; /* Protect save in progress. */
2857 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2860 PL_markstack_ptr++; /* Protect mark. */
2862 PL_scopestack_ix += 1;
2863 /* sv_2cv is too complicated, try a simpler variant first: */
2864 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2865 || SvTYPE(cv) != SVt_PVCV) {
2867 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2870 if (!cv || !CvROOT(cv)) {
2871 if (ckWARN(WARN_SIGNAL))
2872 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2873 PL_sig_name[sig], (gv ? GvENAME(gv)
2880 if(PL_psig_name[sig]) {
2881 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2883 #if !defined(PERL_IMPLICIT_CONTEXT)
2887 sv = sv_newmortal();
2888 sv_setpv(sv,PL_sig_name[sig]);
2891 PUSHSTACKi(PERLSI_SIGNAL);
2894 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2896 struct sigaction oact;
2898 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2901 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2902 /* The siginfo fields signo, code, errno, pid, uid,
2903 * addr, status, and band are defined by POSIX/SUSv3. */
2904 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2905 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2906 #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. */
2907 hv_stores(sih, "errno", newSViv(sip->si_errno));
2908 hv_stores(sih, "status", newSViv(sip->si_status));
2909 hv_stores(sih, "uid", newSViv(sip->si_uid));
2910 hv_stores(sih, "pid", newSViv(sip->si_pid));
2911 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2912 hv_stores(sih, "band", newSViv(sip->si_band));
2916 mPUSHp((char *)sip, sizeof(*sip));
2924 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2927 if (SvTRUE(ERRSV)) {
2929 #ifdef HAS_SIGPROCMASK
2930 /* Handler "died", for example to get out of a restart-able read().
2931 * Before we re-do that on its behalf re-enable the signal which was
2932 * blocked by the system when we entered.
2936 sigaddset(&set,sig);
2937 sigprocmask(SIG_UNBLOCK, &set, NULL);
2939 /* Not clear if this will work */
2940 (void)rsignal(sig, SIG_IGN);
2941 (void)rsignal(sig, PL_csighandlerp);
2943 #endif /* !PERL_MICRO */
2944 Perl_die(aTHX_ NULL);
2948 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2952 PL_scopestack_ix -= 1;
2955 PL_op = myop; /* Apparently not needed... */
2957 PL_Sv = tSv; /* Restore global temporaries. */
2964 S_restore_magic(pTHX_ const void *p)
2967 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2968 SV* const sv = mgs->mgs_sv;
2973 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2975 #ifdef PERL_OLD_COPY_ON_WRITE
2976 /* While magic was saved (and off) sv_setsv may well have seen
2977 this SV as a prime candidate for COW. */
2979 sv_force_normal_flags(sv, 0);
2983 SvFLAGS(sv) |= mgs->mgs_flags;
2986 if (SvGMAGICAL(sv)) {
2987 /* downgrade public flags to private,
2988 and discard any other private flags */
2990 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2992 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2993 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2998 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3000 /* If we're still on top of the stack, pop us off. (That condition
3001 * will be satisfied if restore_magic was called explicitly, but *not*
3002 * if it's being called via leave_scope.)
3003 * The reason for doing this is that otherwise, things like sv_2cv()
3004 * may leave alloc gunk on the savestack, and some code
3005 * (e.g. sighandler) doesn't expect that...
3007 if (PL_savestack_ix == mgs->mgs_ss_ix)
3009 I32 popval = SSPOPINT;
3010 assert(popval == SAVEt_DESTRUCTOR_X);
3011 PL_savestack_ix -= 2;
3013 assert(popval == SAVEt_ALLOC);
3015 PL_savestack_ix -= popval;
3021 S_unwind_handler_stack(pTHX_ const void *p)
3024 const U32 flags = *(const U32*)p;
3026 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3029 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3030 #if !defined(PERL_IMPLICIT_CONTEXT)
3032 SvREFCNT_dec(PL_sig_sv);
3037 =for apidoc magic_sethint
3039 Triggered by a store to %^H, records the key/value pair to
3040 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3041 anything that would need a deep copy. Maybe we should warn if we find a
3047 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3050 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3051 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3053 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3055 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3056 an alternative leaf in there, with PL_compiling.cop_hints being used if
3057 it's NULL. If needed for threads, the alternative could lock a mutex,
3058 or take other more complex action. */
3060 /* Something changed in %^H, so it will need to be restored on scope exit.
3061 Doing this here saves a lot of doing it manually in perl code (and
3062 forgetting to do it, and consequent subtle errors. */
3063 PL_hints |= HINT_LOCALIZE_HH;
3064 PL_compiling.cop_hints_hash
3065 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3070 =for apidoc magic_clearhint
3072 Triggered by a delete from %^H, records the key to
3073 C<PL_compiling.cop_hints_hash>.
3078 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3082 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3083 PERL_UNUSED_ARG(sv);
3085 assert(mg->mg_len == HEf_SVKEY);
3087 PERL_UNUSED_ARG(sv);
3089 PL_hints |= HINT_LOCALIZE_HH;
3090 PL_compiling.cop_hints_hash
3091 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3092 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3098 * c-indentation-style: bsd
3100 * indent-tabs-mode: t
3103 * ex: set ts=8 sts=4 sw=4 noet: