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 i = whichsig(s); /* ...no, a brick */
1427 mg->mg_private = (U16)i;
1430 if (sv && ckWARN(WARN_SIGNAL))
1431 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1434 #ifdef HAS_SIGPROCMASK
1435 /* Avoid having the signal arrive at a bad time, if possible. */
1438 sigprocmask(SIG_BLOCK, &set, &save);
1440 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1441 SAVEFREESV(save_sv);
1442 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1445 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1446 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1448 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1449 PL_sig_ignoring[i] = 0;
1451 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1452 PL_sig_defaulting[i] = 0;
1454 to_dec = PL_psig_ptr[i];
1456 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1457 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1459 /* Signals don't change name during the program's execution, so once
1460 they're cached in the appropriate slot of PL_psig_name, they can
1463 Ideally we'd find some way of making SVs at (C) compile time, or
1464 at least, doing most of the work. */
1465 if (!PL_psig_name[i]) {
1466 PL_psig_name[i] = newSVpvn(s, len);
1467 SvREADONLY_on(PL_psig_name[i]);
1470 SvREFCNT_dec(PL_psig_name[i]);
1471 PL_psig_name[i] = NULL;
1472 PL_psig_ptr[i] = NULL;
1475 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1477 (void)rsignal(i, PL_csighandlerp);
1480 *svp = SvREFCNT_inc_simple_NN(sv);
1482 if (sv && SvOK(sv)) {
1483 s = SvPV_force(sv, len);
1487 if (sv && strEQ(s,"IGNORE")) {
1489 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1490 PL_sig_ignoring[i] = 1;
1491 (void)rsignal(i, PL_csighandlerp);
1493 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1497 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1499 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1500 PL_sig_defaulting[i] = 1;
1501 (void)rsignal(i, PL_csighandlerp);
1503 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1509 * We should warn if HINT_STRICT_REFS, but without
1510 * access to a known hint bit in a known OP, we can't
1511 * tell whether HINT_STRICT_REFS is in force or not.
1513 if (!strchr(s,':') && !strchr(s,'\''))
1514 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1517 (void)rsignal(i, PL_csighandlerp);
1519 *svp = SvREFCNT_inc_simple_NN(sv);
1523 #ifdef HAS_SIGPROCMASK
1528 SvREFCNT_dec(to_dec);
1531 #endif /* !PERL_MICRO */
1534 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1537 PERL_ARGS_ASSERT_MAGIC_SETISA;
1538 PERL_UNUSED_ARG(sv);
1540 /* Skip _isaelem because _isa will handle it shortly */
1541 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1544 return magic_clearisa(NULL, mg);
1547 /* sv of NULL signifies that we're acting as magic_setisa. */
1549 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1554 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1556 /* Bail out if destruction is going on */
1557 if(PL_dirty) return 0;
1560 av_clear(MUTABLE_AV(sv));
1562 /* XXX Once it's possible, we need to
1563 detect that our @ISA is aliased in
1564 other stashes, and act on the stashes
1565 of all of the aliases */
1567 /* The first case occurs via setisa,
1568 the second via setisa_elem, which
1569 calls this same magic */
1571 SvTYPE(mg->mg_obj) == SVt_PVGV
1572 ? (const GV *)mg->mg_obj
1573 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1577 mro_isa_changed_in(stash);
1583 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1586 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1587 PERL_UNUSED_ARG(sv);
1588 PERL_UNUSED_ARG(mg);
1589 PL_amagic_generation++;
1595 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1597 HV * const hv = MUTABLE_HV(LvTARG(sv));
1600 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1601 PERL_UNUSED_ARG(mg);
1604 (void) hv_iterinit(hv);
1605 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1608 while (hv_iternext(hv))
1613 sv_setiv(sv, (IV)i);
1618 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1620 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1621 PERL_UNUSED_ARG(mg);
1623 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1628 /* caller is responsible for stack switching/cleanup */
1630 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1635 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1639 PUSHs(SvTIED_obj(sv, mg));
1642 if (mg->mg_len >= 0)
1643 mPUSHp(mg->mg_ptr, mg->mg_len);
1644 else if (mg->mg_len == HEf_SVKEY)
1645 PUSHs(MUTABLE_SV(mg->mg_ptr));
1647 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1656 return call_method(meth, flags);
1660 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1664 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1668 PUSHSTACKi(PERLSI_MAGIC);
1670 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1671 sv_setsv(sv, *PL_stack_sp--);
1681 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1683 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1686 mg->mg_flags |= MGf_GSKIP;
1687 magic_methpack(sv,mg,"FETCH");
1692 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1696 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1699 PUSHSTACKi(PERLSI_MAGIC);
1700 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1707 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1709 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1711 return magic_methpack(sv,mg,"DELETE");
1716 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1721 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1725 PUSHSTACKi(PERLSI_MAGIC);
1726 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1727 sv = *PL_stack_sp--;
1728 retval = SvIV(sv)-1;
1730 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1735 return (U32) retval;
1739 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1743 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1746 PUSHSTACKi(PERLSI_MAGIC);
1748 XPUSHs(SvTIED_obj(sv, mg));
1750 call_method("CLEAR", G_SCALAR|G_DISCARD);
1758 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1761 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1763 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1767 PUSHSTACKi(PERLSI_MAGIC);
1770 PUSHs(SvTIED_obj(sv, mg));
1775 if (call_method(meth, G_SCALAR))
1776 sv_setsv(key, *PL_stack_sp--);
1785 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1787 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1789 return magic_methpack(sv,mg,"EXISTS");
1793 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1797 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1798 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1800 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1802 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1804 if (HvEITER_get(hv))
1805 /* we are in an iteration so the hash cannot be empty */
1807 /* no xhv_eiter so now use FIRSTKEY */
1808 key = sv_newmortal();
1809 magic_nextpack(MUTABLE_SV(hv), mg, key);
1810 HvEITER_set(hv, NULL); /* need to reset iterator */
1811 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1814 /* there is a SCALAR method that we can call */
1816 PUSHSTACKi(PERLSI_MAGIC);
1822 if (call_method("SCALAR", G_SCALAR))
1823 retval = *PL_stack_sp--;
1825 retval = &PL_sv_undef;
1832 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1835 GV * const gv = PL_DBline;
1836 const I32 i = SvTRUE(sv);
1837 SV ** const svp = av_fetch(GvAV(gv),
1838 atoi(MgPV_nolen_const(mg)), FALSE);
1840 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1842 if (svp && SvIOKp(*svp)) {
1843 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1845 /* set or clear breakpoint in the relevant control op */
1847 o->op_flags |= OPf_SPECIAL;
1849 o->op_flags &= ~OPf_SPECIAL;
1856 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1859 AV * const obj = MUTABLE_AV(mg->mg_obj);
1861 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1864 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1872 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1875 AV * const obj = MUTABLE_AV(mg->mg_obj);
1877 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1880 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1882 if (ckWARN(WARN_MISC))
1883 Perl_warner(aTHX_ packWARN(WARN_MISC),
1884 "Attempt to set length of freed array");
1890 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1894 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1895 PERL_UNUSED_ARG(sv);
1897 /* during global destruction, mg_obj may already have been freed */
1898 if (PL_in_clean_all)
1901 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1904 /* arylen scalar holds a pointer back to the array, but doesn't own a
1905 reference. Hence the we (the array) are about to go away with it
1906 still pointing at us. Clear its pointer, else it would be pointing
1907 at free memory. See the comment in sv_magic about reference loops,
1908 and why it can't own a reference to us. */
1915 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1918 SV* const lsv = LvTARG(sv);
1920 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1921 PERL_UNUSED_ARG(mg);
1923 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1924 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1925 if (found && found->mg_len >= 0) {
1926 I32 i = found->mg_len;
1928 sv_pos_b2u(lsv, &i);
1929 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1938 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1941 SV* const lsv = LvTARG(sv);
1947 PERL_ARGS_ASSERT_MAGIC_SETPOS;
1948 PERL_UNUSED_ARG(mg);
1950 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1951 found = mg_find(lsv, PERL_MAGIC_regex_global);
1957 #ifdef PERL_OLD_COPY_ON_WRITE
1959 sv_force_normal_flags(lsv, 0);
1961 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
1964 else if (!SvOK(sv)) {
1968 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1970 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
1973 ulen = sv_len_utf8(lsv);
1983 else if (pos > (SSize_t)len)
1988 sv_pos_u2b(lsv, &p, 0);
1992 found->mg_len = pos;
1993 found->mg_flags &= ~MGf_MINMATCH;
1999 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2002 SV * const lsv = LvTARG(sv);
2003 const char * const tmps = SvPV_const(lsv,len);
2004 I32 offs = LvTARGOFF(sv);
2005 I32 rem = LvTARGLEN(sv);
2007 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2008 PERL_UNUSED_ARG(mg);
2011 sv_pos_u2b(lsv, &offs, &rem);
2012 if (offs > (I32)len)
2014 if (rem + offs > (I32)len)
2016 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2023 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2027 const char * const tmps = SvPV_const(sv, len);
2028 SV * const lsv = LvTARG(sv);
2029 I32 lvoff = LvTARGOFF(sv);
2030 I32 lvlen = LvTARGLEN(sv);
2032 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2033 PERL_UNUSED_ARG(mg);
2036 sv_utf8_upgrade(lsv);
2037 sv_pos_u2b(lsv, &lvoff, &lvlen);
2038 sv_insert(lsv, lvoff, lvlen, tmps, len);
2039 LvTARGLEN(sv) = sv_len_utf8(sv);
2042 else if (lsv && SvUTF8(lsv)) {
2044 sv_pos_u2b(lsv, &lvoff, &lvlen);
2045 LvTARGLEN(sv) = len;
2046 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2047 sv_insert(lsv, lvoff, lvlen, utf8, len);
2051 sv_insert(lsv, lvoff, lvlen, tmps, len);
2052 LvTARGLEN(sv) = len;
2060 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2064 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2065 PERL_UNUSED_ARG(sv);
2067 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2072 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2076 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2077 PERL_UNUSED_ARG(sv);
2079 /* update taint status */
2088 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2090 SV * const lsv = LvTARG(sv);
2092 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2093 PERL_UNUSED_ARG(mg);
2096 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2104 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2106 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2107 PERL_UNUSED_ARG(mg);
2108 do_vecset(sv); /* XXX slurp this routine */
2113 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2118 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2120 if (LvTARGLEN(sv)) {
2122 SV * const ahv = LvTARG(sv);
2123 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2128 AV *const av = MUTABLE_AV(LvTARG(sv));
2129 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2130 targ = AvARRAY(av)[LvTARGOFF(sv)];
2132 if (targ && (targ != &PL_sv_undef)) {
2133 /* somebody else defined it for us */
2134 SvREFCNT_dec(LvTARG(sv));
2135 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2137 SvREFCNT_dec(mg->mg_obj);
2139 mg->mg_flags &= ~MGf_REFCOUNTED;
2144 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2149 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2151 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2152 PERL_UNUSED_ARG(mg);
2156 sv_setsv(LvTARG(sv), sv);
2157 SvSETMAGIC(LvTARG(sv));
2163 Perl_vivify_defelem(pTHX_ SV *sv)
2169 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2171 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2174 SV * const ahv = LvTARG(sv);
2175 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2178 if (!value || value == &PL_sv_undef)
2179 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2182 AV *const av = MUTABLE_AV(LvTARG(sv));
2183 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2184 LvTARG(sv) = NULL; /* array can't be extended */
2186 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2187 if (!svp || (value = *svp) == &PL_sv_undef)
2188 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2191 SvREFCNT_inc_simple_void(value);
2192 SvREFCNT_dec(LvTARG(sv));
2195 SvREFCNT_dec(mg->mg_obj);
2197 mg->mg_flags &= ~MGf_REFCOUNTED;
2201 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2203 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2204 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2208 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2210 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2211 PERL_UNUSED_CONTEXT;
2218 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2220 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2222 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2224 if (uf && uf->uf_set)
2225 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2230 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2232 const char type = mg->mg_type;
2234 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2236 if (type == PERL_MAGIC_qr) {
2237 } else if (type == PERL_MAGIC_bm) {
2241 assert(type == PERL_MAGIC_fm);
2244 return sv_unmagic(sv, type);
2247 #ifdef USE_LOCALE_COLLATE
2249 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2251 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2254 * RenE<eacute> Descartes said "I think not."
2255 * and vanished with a faint plop.
2257 PERL_UNUSED_CONTEXT;
2258 PERL_UNUSED_ARG(sv);
2260 Safefree(mg->mg_ptr);
2266 #endif /* USE_LOCALE_COLLATE */
2268 /* Just clear the UTF-8 cache data. */
2270 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2272 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2273 PERL_UNUSED_CONTEXT;
2274 PERL_UNUSED_ARG(sv);
2275 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2277 mg->mg_len = -1; /* The mg_len holds the len cache. */
2282 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2285 register const char *s;
2287 register const REGEXP * rx;
2288 const char * const remaining = mg->mg_ptr + 1;
2292 PERL_ARGS_ASSERT_MAGIC_SET;
2294 switch (*mg->mg_ptr) {
2295 case '\015': /* $^MATCH */
2296 if (strEQ(remaining, "ATCH"))
2298 case '`': /* ${^PREMATCH} caught below */
2300 paren = RX_BUFF_IDX_PREMATCH;
2302 case '\'': /* ${^POSTMATCH} caught below */
2304 paren = RX_BUFF_IDX_POSTMATCH;
2308 paren = RX_BUFF_IDX_FULLMATCH;
2310 case '1': case '2': case '3': case '4':
2311 case '5': case '6': case '7': case '8': case '9':
2312 paren = atoi(mg->mg_ptr);
2314 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2315 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2318 /* Croak with a READONLY error when a numbered match var is
2319 * set without a previous pattern match. Unless it's C<local $1>
2321 if (!PL_localizing) {
2322 Perl_croak(aTHX_ "%s", PL_no_modify);
2325 case '\001': /* ^A */
2326 sv_setsv(PL_bodytarget, sv);
2328 case '\003': /* ^C */
2329 PL_minus_c = (bool)SvIV(sv);
2332 case '\004': /* ^D */
2334 s = SvPV_nolen_const(sv);
2335 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2336 DEBUG_x(dump_all());
2338 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2341 case '\005': /* ^E */
2342 if (*(mg->mg_ptr+1) == '\0') {
2344 set_vaxc_errno(SvIV(sv));
2347 SetLastError( SvIV(sv) );
2350 os2_setsyserrno(SvIV(sv));
2352 /* will anyone ever use this? */
2353 SETERRNO(SvIV(sv), 4);
2358 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2360 SvREFCNT_dec(PL_encoding);
2361 if (SvOK(sv) || SvGMAGICAL(sv)) {
2362 PL_encoding = newSVsv(sv);
2369 case '\006': /* ^F */
2370 PL_maxsysfd = SvIV(sv);
2372 case '\010': /* ^H */
2373 PL_hints = SvIV(sv);
2375 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2376 Safefree(PL_inplace);
2377 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2379 case '\017': /* ^O */
2380 if (*(mg->mg_ptr+1) == '\0') {
2381 Safefree(PL_osname);
2384 TAINT_PROPER("assigning to $^O");
2385 PL_osname = savesvpv(sv);
2388 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2390 const char *const start = SvPV(sv, len);
2391 const char *out = (const char*)memchr(start, '\0', len);
2393 struct refcounted_he *tmp_he;
2396 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2398 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2400 /* Opening for input is more common than opening for output, so
2401 ensure that hints for input are sooner on linked list. */
2402 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2403 SVs_TEMP | SvUTF8(sv))
2404 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
2407 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2408 newSVpvs_flags("open>", SVs_TEMP),
2411 /* The UTF-8 setting is carried over */
2412 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2414 PL_compiling.cop_hints_hash
2415 = Perl_refcounted_he_new(aTHX_ tmp_he,
2416 newSVpvs_flags("open<", SVs_TEMP),
2420 case '\020': /* ^P */
2421 if (*remaining == '\0') { /* ^P */
2422 PL_perldb = SvIV(sv);
2423 if (PL_perldb && !PL_DBsingle)
2426 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2428 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2431 case '\024': /* ^T */
2433 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2435 PL_basetime = (Time_t)SvIV(sv);
2438 case '\025': /* ^UTF8CACHE */
2439 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2440 PL_utf8cache = (signed char) sv_2iv(sv);
2443 case '\027': /* ^W & $^WARNING_BITS */
2444 if (*(mg->mg_ptr+1) == '\0') {
2445 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2447 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2448 | (i ? G_WARN_ON : G_WARN_OFF) ;
2451 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2452 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2453 if (!SvPOK(sv) && PL_localizing) {
2454 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2455 PL_compiling.cop_warnings = pWARN_NONE;
2460 int accumulate = 0 ;
2461 int any_fatals = 0 ;
2462 const char * const ptr = SvPV_const(sv, len) ;
2463 for (i = 0 ; i < len ; ++i) {
2464 accumulate |= ptr[i] ;
2465 any_fatals |= (ptr[i] & 0xAA) ;
2468 if (!specialWARN(PL_compiling.cop_warnings))
2469 PerlMemShared_free(PL_compiling.cop_warnings);
2470 PL_compiling.cop_warnings = pWARN_NONE;
2472 /* Yuck. I can't see how to abstract this: */
2473 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2474 WARN_ALL) && !any_fatals) {
2475 if (!specialWARN(PL_compiling.cop_warnings))
2476 PerlMemShared_free(PL_compiling.cop_warnings);
2477 PL_compiling.cop_warnings = pWARN_ALL;
2478 PL_dowarn |= G_WARN_ONCE ;
2482 const char *const p = SvPV_const(sv, len);
2484 PL_compiling.cop_warnings
2485 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2488 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2489 PL_dowarn |= G_WARN_ONCE ;
2497 if (PL_localizing) {
2498 if (PL_localizing == 1)
2499 SAVESPTR(PL_last_in_gv);
2501 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2502 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2505 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2506 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2507 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2510 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2511 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2512 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2515 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2518 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2519 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2520 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2523 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2527 IO * const io = GvIOp(PL_defoutgv);
2530 if ((SvIV(sv)) == 0)
2531 IoFLAGS(io) &= ~IOf_FLUSH;
2533 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2534 PerlIO *ofp = IoOFP(io);
2536 (void)PerlIO_flush(ofp);
2537 IoFLAGS(io) |= IOf_FLUSH;
2543 SvREFCNT_dec(PL_rs);
2544 PL_rs = newSVsv(sv);
2548 SvREFCNT_dec(PL_ors_sv);
2549 if (SvOK(sv) || SvGMAGICAL(sv)) {
2550 PL_ors_sv = newSVsv(sv);
2557 CopARYBASE_set(&PL_compiling, SvIV(sv));
2560 #ifdef COMPLEX_STATUS
2561 if (PL_localizing == 2) {
2562 SvUPGRADE(sv, SVt_PVLV);
2563 PL_statusvalue = LvTARGOFF(sv);
2564 PL_statusvalue_vms = LvTARGLEN(sv);
2568 #ifdef VMSISH_STATUS
2570 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2573 STATUS_UNIX_EXIT_SET(SvIV(sv));
2578 # define PERL_VMS_BANG vaxc$errno
2580 # define PERL_VMS_BANG 0
2582 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2583 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2588 if (PL_delaymagic) {
2589 PL_delaymagic |= DM_RUID;
2590 break; /* don't do magic till later */
2593 (void)setruid((Uid_t)PL_uid);
2596 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2598 #ifdef HAS_SETRESUID
2599 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2601 if (PL_uid == PL_euid) { /* special case $< = $> */
2603 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2604 if (PL_uid != 0 && PerlProc_getuid() == 0)
2605 (void)PerlProc_setuid(0);
2607 (void)PerlProc_setuid(PL_uid);
2609 PL_uid = PerlProc_getuid();
2610 Perl_croak(aTHX_ "setruid() not implemented");
2615 PL_uid = PerlProc_getuid();
2616 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2620 if (PL_delaymagic) {
2621 PL_delaymagic |= DM_EUID;
2622 break; /* don't do magic till later */
2625 (void)seteuid((Uid_t)PL_euid);
2628 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2630 #ifdef HAS_SETRESUID
2631 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2633 if (PL_euid == PL_uid) /* special case $> = $< */
2634 PerlProc_setuid(PL_euid);
2636 PL_euid = PerlProc_geteuid();
2637 Perl_croak(aTHX_ "seteuid() not implemented");
2642 PL_euid = PerlProc_geteuid();
2643 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2647 if (PL_delaymagic) {
2648 PL_delaymagic |= DM_RGID;
2649 break; /* don't do magic till later */
2652 (void)setrgid((Gid_t)PL_gid);
2655 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2657 #ifdef HAS_SETRESGID
2658 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2660 if (PL_gid == PL_egid) /* special case $( = $) */
2661 (void)PerlProc_setgid(PL_gid);
2663 PL_gid = PerlProc_getgid();
2664 Perl_croak(aTHX_ "setrgid() not implemented");
2669 PL_gid = PerlProc_getgid();
2670 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2673 #ifdef HAS_SETGROUPS
2675 const char *p = SvPV_const(sv, len);
2676 Groups_t *gary = NULL;
2681 for (i = 0; i < NGROUPS; ++i) {
2682 while (*p && !isSPACE(*p))
2689 Newx(gary, i + 1, Groups_t);
2691 Renew(gary, i + 1, Groups_t);
2695 (void)setgroups(i, gary);
2698 #else /* HAS_SETGROUPS */
2700 #endif /* HAS_SETGROUPS */
2701 if (PL_delaymagic) {
2702 PL_delaymagic |= DM_EGID;
2703 break; /* don't do magic till later */
2706 (void)setegid((Gid_t)PL_egid);
2709 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2711 #ifdef HAS_SETRESGID
2712 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2714 if (PL_egid == PL_gid) /* special case $) = $( */
2715 (void)PerlProc_setgid(PL_egid);
2717 PL_egid = PerlProc_getegid();
2718 Perl_croak(aTHX_ "setegid() not implemented");
2723 PL_egid = PerlProc_getegid();
2724 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2727 PL_chopset = SvPV_force(sv,len);
2730 LOCK_DOLLARZERO_MUTEX;
2731 #ifdef HAS_SETPROCTITLE
2732 /* The BSDs don't show the argv[] in ps(1) output, they
2733 * show a string from the process struct and provide
2734 * the setproctitle() routine to manipulate that. */
2735 if (PL_origalen != 1) {
2736 s = SvPV_const(sv, len);
2737 # if __FreeBSD_version > 410001
2738 /* The leading "-" removes the "perl: " prefix,
2739 * but not the "(perl) suffix from the ps(1)
2740 * output, because that's what ps(1) shows if the
2741 * argv[] is modified. */
2742 setproctitle("-%s", s);
2743 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2744 /* This doesn't really work if you assume that
2745 * $0 = 'foobar'; will wipe out 'perl' from the $0
2746 * because in ps(1) output the result will be like
2747 * sprintf("perl: %s (perl)", s)
2748 * I guess this is a security feature:
2749 * one (a user process) cannot get rid of the original name.
2751 setproctitle("%s", s);
2754 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2755 if (PL_origalen != 1) {
2757 s = SvPV_const(sv, len);
2758 un.pst_command = (char *)s;
2759 pstat(PSTAT_SETCMD, un, len, 0, 0);
2762 if (PL_origalen > 1) {
2763 /* PL_origalen is set in perl_parse(). */
2764 s = SvPV_force(sv,len);
2765 if (len >= (STRLEN)PL_origalen-1) {
2766 /* Longer than original, will be truncated. We assume that
2767 * PL_origalen bytes are available. */
2768 Copy(s, PL_origargv[0], PL_origalen-1, char);
2771 /* Shorter than original, will be padded. */
2773 /* Special case for Mac OS X: see [perl #38868] */
2776 /* Is the space counterintuitive? Yes.
2777 * (You were expecting \0?)
2778 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2780 const int pad = ' ';
2782 Copy(s, PL_origargv[0], len, char);
2783 PL_origargv[0][len] = 0;
2784 memset(PL_origargv[0] + len + 1,
2785 pad, PL_origalen - len - 1);
2787 PL_origargv[0][PL_origalen-1] = 0;
2788 for (i = 1; i < PL_origargc; i++)
2792 UNLOCK_DOLLARZERO_MUTEX;
2799 Perl_whichsig(pTHX_ const char *sig)
2801 register char* const* sigv;
2803 PERL_ARGS_ASSERT_WHICHSIG;
2804 PERL_UNUSED_CONTEXT;
2806 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2807 if (strEQ(sig,*sigv))
2808 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2810 if (strEQ(sig,"CHLD"))
2814 if (strEQ(sig,"CLD"))
2821 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2822 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2824 Perl_sighandler(int sig)
2827 #ifdef PERL_GET_SIG_CONTEXT
2828 dTHXa(PERL_GET_SIG_CONTEXT);
2835 SV * const tSv = PL_Sv;
2839 XPV * const tXpv = PL_Xpv;
2841 if (PL_savestack_ix + 15 <= PL_savestack_max)
2843 if (PL_markstack_ptr < PL_markstack_max - 2)
2845 if (PL_scopestack_ix < PL_scopestack_max - 3)
2848 if (!PL_psig_ptr[sig]) {
2849 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2854 /* Max number of items pushed there is 3*n or 4. We cannot fix
2855 infinity, so we fix 4 (in fact 5): */
2857 PL_savestack_ix += 5; /* Protect save in progress. */
2858 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2861 PL_markstack_ptr++; /* Protect mark. */
2863 PL_scopestack_ix += 1;
2864 /* sv_2cv is too complicated, try a simpler variant first: */
2865 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2866 || SvTYPE(cv) != SVt_PVCV) {
2868 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2871 if (!cv || !CvROOT(cv)) {
2872 if (ckWARN(WARN_SIGNAL))
2873 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2874 PL_sig_name[sig], (gv ? GvENAME(gv)
2881 if(PL_psig_name[sig]) {
2882 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2884 #if !defined(PERL_IMPLICIT_CONTEXT)
2888 sv = sv_newmortal();
2889 sv_setpv(sv,PL_sig_name[sig]);
2892 PUSHSTACKi(PERLSI_SIGNAL);
2895 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2897 struct sigaction oact;
2899 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2902 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2903 /* The siginfo fields signo, code, errno, pid, uid,
2904 * addr, status, and band are defined by POSIX/SUSv3. */
2905 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2906 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2907 #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. */
2908 hv_stores(sih, "errno", newSViv(sip->si_errno));
2909 hv_stores(sih, "status", newSViv(sip->si_status));
2910 hv_stores(sih, "uid", newSViv(sip->si_uid));
2911 hv_stores(sih, "pid", newSViv(sip->si_pid));
2912 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2913 hv_stores(sih, "band", newSViv(sip->si_band));
2917 mPUSHp((char *)sip, sizeof(*sip));
2925 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2928 if (SvTRUE(ERRSV)) {
2930 #ifdef HAS_SIGPROCMASK
2931 /* Handler "died", for example to get out of a restart-able read().
2932 * Before we re-do that on its behalf re-enable the signal which was
2933 * blocked by the system when we entered.
2937 sigaddset(&set,sig);
2938 sigprocmask(SIG_UNBLOCK, &set, NULL);
2940 /* Not clear if this will work */
2941 (void)rsignal(sig, SIG_IGN);
2942 (void)rsignal(sig, PL_csighandlerp);
2944 #endif /* !PERL_MICRO */
2945 Perl_die(aTHX_ NULL);
2949 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2953 PL_scopestack_ix -= 1;
2956 PL_op = myop; /* Apparently not needed... */
2958 PL_Sv = tSv; /* Restore global temporaries. */
2965 S_restore_magic(pTHX_ const void *p)
2968 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2969 SV* const sv = mgs->mgs_sv;
2974 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2976 #ifdef PERL_OLD_COPY_ON_WRITE
2977 /* While magic was saved (and off) sv_setsv may well have seen
2978 this SV as a prime candidate for COW. */
2980 sv_force_normal_flags(sv, 0);
2984 SvFLAGS(sv) |= mgs->mgs_flags;
2987 if (SvGMAGICAL(sv)) {
2988 /* downgrade public flags to private,
2989 and discard any other private flags */
2991 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2993 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2994 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2999 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3001 /* If we're still on top of the stack, pop us off. (That condition
3002 * will be satisfied if restore_magic was called explicitly, but *not*
3003 * if it's being called via leave_scope.)
3004 * The reason for doing this is that otherwise, things like sv_2cv()
3005 * may leave alloc gunk on the savestack, and some code
3006 * (e.g. sighandler) doesn't expect that...
3008 if (PL_savestack_ix == mgs->mgs_ss_ix)
3010 I32 popval = SSPOPINT;
3011 assert(popval == SAVEt_DESTRUCTOR_X);
3012 PL_savestack_ix -= 2;
3014 assert(popval == SAVEt_ALLOC);
3016 PL_savestack_ix -= popval;
3022 S_unwind_handler_stack(pTHX_ const void *p)
3025 const U32 flags = *(const U32*)p;
3027 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3030 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3031 #if !defined(PERL_IMPLICIT_CONTEXT)
3033 SvREFCNT_dec(PL_sig_sv);
3038 =for apidoc magic_sethint
3040 Triggered by a store to %^H, records the key/value pair to
3041 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3042 anything that would need a deep copy. Maybe we should warn if we find a
3048 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3051 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3052 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3054 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3056 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3057 an alternative leaf in there, with PL_compiling.cop_hints being used if
3058 it's NULL. If needed for threads, the alternative could lock a mutex,
3059 or take other more complex action. */
3061 /* Something changed in %^H, so it will need to be restored on scope exit.
3062 Doing this here saves a lot of doing it manually in perl code (and
3063 forgetting to do it, and consequent subtle errors. */
3064 PL_hints |= HINT_LOCALIZE_HH;
3065 PL_compiling.cop_hints_hash
3066 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3071 =for apidoc magic_clearhint
3073 Triggered by a delete from %^H, records the key to
3074 C<PL_compiling.cop_hints_hash>.
3079 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3083 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3084 PERL_UNUSED_ARG(sv);
3086 assert(mg->mg_len == HEf_SVKEY);
3088 PERL_UNUSED_ARG(sv);
3090 PL_hints |= HINT_LOCALIZE_HH;
3091 PL_compiling.cop_hints_hash
3092 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3093 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3099 * c-indentation-style: bsd
3101 * indent-tabs-mode: t
3104 * ex: set ts=8 sts=4 sw=4 noet: