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));
387 PERL_ARGS_ASSERT_MG_CLEAR;
389 save_magic(mgs_ix, sv);
391 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
392 const MGVTBL* const vtbl = mg->mg_virtual;
393 /* omit GSKIP -- never set here */
395 if (vtbl && vtbl->svt_clear)
396 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
399 restore_magic(INT2PTR(void*, (IV)mgs_ix));
406 Finds the magic pointer for type matching the SV. See C<sv_magic>.
412 Perl_mg_find(pTHX_ const SV *sv, int type)
417 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
418 if (mg->mg_type == type)
428 Copies the magic from one SV to another. See C<sv_magic>.
434 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
439 PERL_ARGS_ASSERT_MG_COPY;
441 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
442 const MGVTBL* const vtbl = mg->mg_virtual;
443 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
444 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
447 const char type = mg->mg_type;
448 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
450 (type == PERL_MAGIC_tied)
452 : (type == PERL_MAGIC_regdata && mg->mg_obj)
455 toLOWER(type), key, klen);
464 =for apidoc mg_localize
466 Copy some of the magic from an existing SV to new localized version of that
467 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
470 If setmagic is false then no set magic will be called on the new (empty) SV.
471 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
472 and that will handle the magic.
478 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
483 PERL_ARGS_ASSERT_MG_LOCALIZE;
485 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
486 const MGVTBL* const vtbl = mg->mg_virtual;
487 if (!S_is_container_magic(mg))
490 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
491 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
493 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
494 mg->mg_ptr, mg->mg_len);
496 /* container types should remain read-only across localization */
497 SvFLAGS(nsv) |= SvREADONLY(sv);
500 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
501 SvFLAGS(nsv) |= SvMAGICAL(sv);
513 Free any magic storage used by the SV. See C<sv_magic>.
519 Perl_mg_free(pTHX_ SV *sv)
524 PERL_ARGS_ASSERT_MG_FREE;
526 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
527 const MGVTBL* const vtbl = mg->mg_virtual;
528 moremagic = mg->mg_moremagic;
529 if (vtbl && vtbl->svt_free)
530 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
531 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
532 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
533 Safefree(mg->mg_ptr);
534 else if (mg->mg_len == HEf_SVKEY)
535 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
537 if (mg->mg_flags & MGf_REFCOUNTED)
538 SvREFCNT_dec(mg->mg_obj);
540 SvMAGIC_set(sv, moremagic);
542 SvMAGIC_set(sv, NULL);
550 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
555 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
558 register const REGEXP * const rx = PM_GETRE(PL_curpm);
560 if (mg->mg_obj) { /* @+ */
561 /* return the number possible */
562 return RX_NPARENS(rx);
564 I32 paren = RX_LASTPAREN(rx);
566 /* return the last filled */
568 && (RX_OFFS(rx)[paren].start == -1
569 || RX_OFFS(rx)[paren].end == -1) )
580 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
584 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
587 register const REGEXP * const rx = PM_GETRE(PL_curpm);
589 register const I32 paren = mg->mg_len;
594 if (paren <= (I32)RX_NPARENS(rx) &&
595 (s = RX_OFFS(rx)[paren].start) != -1 &&
596 (t = RX_OFFS(rx)[paren].end) != -1)
599 if (mg->mg_obj) /* @+ */
604 if (i > 0 && RX_MATCH_UTF8(rx)) {
605 const char * const b = RX_SUBBEG(rx);
607 i = utf8_length((U8*)b, (U8*)(b+i));
618 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
620 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
623 Perl_croak(aTHX_ "%s", PL_no_modify);
624 NORETURN_FUNCTION_END;
628 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
633 register const REGEXP * rx;
634 const char * const remaining = mg->mg_ptr + 1;
636 PERL_ARGS_ASSERT_MAGIC_LEN;
638 switch (*mg->mg_ptr) {
640 if (*remaining == '\0') { /* ^P */
642 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
644 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
648 case '\015': /* $^MATCH */
649 if (strEQ(remaining, "ATCH")) {
656 paren = RX_BUFF_IDX_PREMATCH;
660 paren = RX_BUFF_IDX_POSTMATCH;
664 paren = RX_BUFF_IDX_FULLMATCH;
666 case '1': case '2': case '3': case '4':
667 case '5': case '6': case '7': case '8': case '9':
668 paren = atoi(mg->mg_ptr);
670 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
672 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
675 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
678 if (ckWARN(WARN_UNINITIALIZED))
683 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
684 paren = RX_LASTPAREN(rx);
689 case '\016': /* ^N */
690 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
691 paren = RX_LASTCLOSEPAREN(rx);
698 if (!SvPOK(sv) && SvNIOK(sv)) {
706 #define SvRTRIM(sv) STMT_START { \
708 STRLEN len = SvCUR(sv); \
709 char * const p = SvPVX(sv); \
710 while (len > 0 && isSPACE(p[len-1])) \
712 SvCUR_set(sv, len); \
718 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
720 PERL_ARGS_ASSERT_EMULATE_COP_IO;
722 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
723 sv_setsv(sv, &PL_sv_undef);
727 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
728 SV *const value = Perl_refcounted_he_fetch(aTHX_
730 0, "open<", 5, 0, 0);
735 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
736 SV *const value = Perl_refcounted_he_fetch(aTHX_
738 0, "open>", 5, 0, 0);
746 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
750 register char *s = NULL;
752 const char * const remaining = mg->mg_ptr + 1;
753 const char nextchar = *remaining;
755 PERL_ARGS_ASSERT_MAGIC_GET;
757 switch (*mg->mg_ptr) {
758 case '\001': /* ^A */
759 sv_setsv(sv, PL_bodytarget);
761 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
762 if (nextchar == '\0') {
763 sv_setiv(sv, (IV)PL_minus_c);
765 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
766 sv_setiv(sv, (IV)STATUS_NATIVE);
770 case '\004': /* ^D */
771 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
773 case '\005': /* ^E */
774 if (nextchar == '\0') {
777 # include <descrip.h>
778 # include <starlet.h>
780 $DESCRIPTOR(msgdsc,msg);
781 sv_setnv(sv,(NV) vaxc$errno);
782 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
783 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
788 if (!(_emx_env & 0x200)) { /* Under DOS */
789 sv_setnv(sv, (NV)errno);
790 sv_setpv(sv, errno ? Strerror(errno) : "");
792 if (errno != errno_isOS2) {
793 const int tmp = _syserrno();
794 if (tmp) /* 2nd call to _syserrno() makes it 0 */
797 sv_setnv(sv, (NV)Perl_rc);
798 sv_setpv(sv, os2error(Perl_rc));
802 const DWORD dwErr = GetLastError();
803 sv_setnv(sv, (NV)dwErr);
805 PerlProc_GetOSError(sv, dwErr);
814 sv_setnv(sv, (NV)errno);
815 sv_setpv(sv, errno ? Strerror(errno) : "");
820 SvNOK_on(sv); /* what a wonderful hack! */
822 else if (strEQ(remaining, "NCODING"))
823 sv_setsv(sv, PL_encoding);
825 case '\006': /* ^F */
826 sv_setiv(sv, (IV)PL_maxsysfd);
828 case '\010': /* ^H */
829 sv_setiv(sv, (IV)PL_hints);
831 case '\011': /* ^I */ /* NOT \t in EBCDIC */
832 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
834 case '\017': /* ^O & ^OPEN */
835 if (nextchar == '\0') {
836 sv_setpv(sv, PL_osname);
839 else if (strEQ(remaining, "PEN")) {
840 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
844 if (nextchar == '\0') { /* ^P */
845 sv_setiv(sv, (IV)PL_perldb);
846 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
847 goto do_prematch_fetch;
848 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
849 goto do_postmatch_fetch;
852 case '\023': /* ^S */
853 if (nextchar == '\0') {
854 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
857 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
862 case '\024': /* ^T */
863 if (nextchar == '\0') {
865 sv_setnv(sv, PL_basetime);
867 sv_setiv(sv, (IV)PL_basetime);
870 else if (strEQ(remaining, "AINT"))
871 sv_setiv(sv, PL_tainting
872 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
875 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
876 if (strEQ(remaining, "NICODE"))
877 sv_setuv(sv, (UV) PL_unicode);
878 else if (strEQ(remaining, "TF8LOCALE"))
879 sv_setuv(sv, (UV) PL_utf8locale);
880 else if (strEQ(remaining, "TF8CACHE"))
881 sv_setiv(sv, (IV) PL_utf8cache);
883 case '\027': /* ^W & $^WARNING_BITS */
884 if (nextchar == '\0')
885 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
886 else if (strEQ(remaining, "ARNING_BITS")) {
887 if (PL_compiling.cop_warnings == pWARN_NONE) {
888 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
890 else if (PL_compiling.cop_warnings == pWARN_STD) {
893 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
897 else if (PL_compiling.cop_warnings == pWARN_ALL) {
898 /* Get the bit mask for $warnings::Bits{all}, because
899 * it could have been extended by warnings::register */
900 HV * const bits=get_hv("warnings::Bits", 0);
902 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
904 sv_setsv(sv, *bits_all);
907 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
911 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
912 *PL_compiling.cop_warnings);
917 case '\015': /* $^MATCH */
918 if (strEQ(remaining, "ATCH")) {
919 case '1': case '2': case '3': case '4':
920 case '5': case '6': case '7': case '8': case '9': case '&':
921 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
923 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
924 * XXX Does the new way break anything?
926 paren = atoi(mg->mg_ptr); /* $& is in [0] */
927 CALLREG_NUMBUF_FETCH(rx,paren,sv);
930 sv_setsv(sv,&PL_sv_undef);
934 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
935 if (RX_LASTPAREN(rx)) {
936 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
940 sv_setsv(sv,&PL_sv_undef);
942 case '\016': /* ^N */
943 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
944 if (RX_LASTCLOSEPAREN(rx)) {
945 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
950 sv_setsv(sv,&PL_sv_undef);
954 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
955 CALLREG_NUMBUF_FETCH(rx,-2,sv);
958 sv_setsv(sv,&PL_sv_undef);
962 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
963 CALLREG_NUMBUF_FETCH(rx,-1,sv);
966 sv_setsv(sv,&PL_sv_undef);
969 if (GvIO(PL_last_in_gv)) {
970 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
975 sv_setiv(sv, (IV)STATUS_CURRENT);
976 #ifdef COMPLEX_STATUS
977 LvTARGOFF(sv) = PL_statusvalue;
978 LvTARGLEN(sv) = PL_statusvalue_vms;
983 if (GvIOp(PL_defoutgv))
984 s = IoTOP_NAME(GvIOp(PL_defoutgv));
988 sv_setpv(sv,GvENAME(PL_defoutgv));
989 sv_catpvs(sv,"_TOP");
993 if (GvIOp(PL_defoutgv))
994 s = IoFMT_NAME(GvIOp(PL_defoutgv));
996 s = GvENAME(PL_defoutgv);
1000 if (GvIOp(PL_defoutgv))
1001 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1004 if (GvIOp(PL_defoutgv))
1005 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1008 if (GvIOp(PL_defoutgv))
1009 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1016 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1019 if (GvIOp(PL_defoutgv))
1020 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1024 sv_copypv(sv, PL_ors_sv);
1028 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1029 sv_setpv(sv, errno ? Strerror(errno) : "");
1033 sv_setnv(sv, (NV)errno);
1035 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1036 sv_setpv(sv, os2error(Perl_rc));
1039 sv_setpv(sv, errno ? Strerror(errno) : "");
1044 SvNOK_on(sv); /* what a wonderful hack! */
1047 sv_setiv(sv, (IV)PL_uid);
1050 sv_setiv(sv, (IV)PL_euid);
1053 sv_setiv(sv, (IV)PL_gid);
1056 sv_setiv(sv, (IV)PL_egid);
1058 #ifdef HAS_GETGROUPS
1060 Groups_t *gary = NULL;
1061 I32 i, num_groups = getgroups(0, gary);
1062 Newx(gary, num_groups, Groups_t);
1063 num_groups = getgroups(num_groups, gary);
1064 for (i = 0; i < num_groups; i++)
1065 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1068 (void)SvIOK_on(sv); /* what a wonderful hack! */
1078 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1080 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1082 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1084 if (uf && uf->uf_val)
1085 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1090 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1093 STRLEN len = 0, klen;
1094 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1095 const char * const ptr = MgPV_const(mg,klen);
1098 PERL_ARGS_ASSERT_MAGIC_SETENV;
1100 #ifdef DYNAMIC_ENV_FETCH
1101 /* We just undefd an environment var. Is a replacement */
1102 /* waiting in the wings? */
1104 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1106 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1110 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1111 /* And you'll never guess what the dog had */
1112 /* in its mouth... */
1114 MgTAINTEDDIR_off(mg);
1116 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1117 char pathbuf[256], eltbuf[256], *cp, *elt;
1121 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1123 do { /* DCL$PATH may be a search list */
1124 while (1) { /* as may dev portion of any element */
1125 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1126 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1127 cando_by_name(S_IWUSR,0,elt) ) {
1128 MgTAINTEDDIR_on(mg);
1132 if ((cp = strchr(elt, ':')) != NULL)
1134 if (my_trnlnm(elt, eltbuf, j++))
1140 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1143 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1144 const char * const strend = s + len;
1146 while (s < strend) {
1150 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1151 const char path_sep = '|';
1153 const char path_sep = ':';
1155 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1156 s, strend, path_sep, &i);
1158 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1160 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1162 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1164 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1165 MgTAINTEDDIR_on(mg);
1171 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1177 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1179 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1180 PERL_UNUSED_ARG(sv);
1181 my_setenv(MgPV_nolen_const(mg),NULL);
1186 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1189 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1190 PERL_UNUSED_ARG(mg);
1192 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1194 if (PL_localizing) {
1197 hv_iterinit(MUTABLE_HV(sv));
1198 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1200 my_setenv(hv_iterkey(entry, &keylen),
1201 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1209 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1212 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1213 PERL_UNUSED_ARG(sv);
1214 PERL_UNUSED_ARG(mg);
1216 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1224 #ifdef HAS_SIGPROCMASK
1226 restore_sigmask(pTHX_ SV *save_sv)
1228 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1229 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1233 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1236 /* Are we fetching a signal entry? */
1237 const I32 i = whichsig(MgPV_nolen_const(mg));
1239 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1243 sv_setsv(sv,PL_psig_ptr[i]);
1245 Sighandler_t sigstate = rsignal_state(i);
1246 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1247 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1250 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1251 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1254 /* cache state so we don't fetch it again */
1255 if(sigstate == (Sighandler_t) SIG_IGN)
1256 sv_setpvs(sv,"IGNORE");
1258 sv_setsv(sv,&PL_sv_undef);
1259 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1266 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1268 /* XXX Some of this code was copied from Perl_magic_setsig. A little
1269 * refactoring might be in order.
1272 register const char * const s = MgPV_nolen_const(mg);
1273 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1274 PERL_UNUSED_ARG(sv);
1277 if (strEQ(s,"__DIE__"))
1279 else if (strEQ(s,"__WARN__") && PL_warnhook != PERL_WARNHOOK_FATAL)
1282 SV *const to_dec = *svp;
1284 SvREFCNT_dec(to_dec);
1288 /* Are we clearing a signal entry? */
1289 const I32 i = whichsig(s);
1291 #ifdef HAS_SIGPROCMASK
1294 /* Avoid having the signal arrive at a bad time, if possible. */
1297 sigprocmask(SIG_BLOCK, &set, &save);
1299 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1300 SAVEFREESV(save_sv);
1301 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1304 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1305 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1307 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1308 PL_sig_defaulting[i] = 1;
1309 (void)rsignal(i, PL_csighandlerp);
1311 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1313 if(PL_psig_name[i]) {
1314 SvREFCNT_dec(PL_psig_name[i]);
1317 if(PL_psig_ptr[i]) {
1318 SV * const to_dec=PL_psig_ptr[i];
1320 #ifdef HAS_SIGPROCMASK
1323 SvREFCNT_dec(to_dec);
1325 #ifdef HAS_SIGPROCMASK
1335 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1336 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1338 Perl_csighandler(int sig)
1341 #ifdef PERL_GET_SIG_CONTEXT
1342 dTHXa(PERL_GET_SIG_CONTEXT);
1346 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1347 (void) rsignal(sig, PL_csighandlerp);
1348 if (PL_sig_ignoring[sig]) return;
1350 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1351 if (PL_sig_defaulting[sig])
1352 #ifdef KILL_BY_SIGPRC
1353 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1368 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1369 /* Call the perl level handler now--
1370 * with risk we may be in malloc() etc. */
1371 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1372 (*PL_sighandlerp)(sig, NULL, NULL);
1374 (*PL_sighandlerp)(sig);
1377 /* Set a flag to say this signal is pending, that is awaiting delivery after
1378 * the current Perl opcode completes */
1379 PL_psig_pend[sig]++;
1381 #ifndef SIG_PENDING_DIE_COUNT
1382 # define SIG_PENDING_DIE_COUNT 120
1384 /* And one to say _a_ signal is pending */
1385 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1386 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1387 (unsigned long)SIG_PENDING_DIE_COUNT);
1391 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1393 Perl_csighandler_init(void)
1396 if (PL_sig_handlers_initted) return;
1398 for (sig = 1; sig < SIG_SIZE; sig++) {
1399 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1401 PL_sig_defaulting[sig] = 1;
1402 (void) rsignal(sig, PL_csighandlerp);
1404 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1405 PL_sig_ignoring[sig] = 0;
1408 PL_sig_handlers_initted = 1;
1413 Perl_despatch_signals(pTHX)
1418 for (sig = 1; sig < SIG_SIZE; sig++) {
1419 if (PL_psig_pend[sig]) {
1420 PERL_BLOCKSIG_ADD(set, sig);
1421 PL_psig_pend[sig] = 0;
1422 PERL_BLOCKSIG_BLOCK(set);
1423 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1424 (*PL_sighandlerp)(sig, NULL, NULL);
1426 (*PL_sighandlerp)(sig);
1428 PERL_BLOCKSIG_UNBLOCK(set);
1434 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1439 /* Need to be careful with SvREFCNT_dec(), because that can have side
1440 * effects (due to closures). We must make sure that the new disposition
1441 * is in place before it is called.
1445 #ifdef HAS_SIGPROCMASK
1449 register const char *s = MgPV_const(mg,len);
1451 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1454 if (strEQ(s,"__DIE__"))
1456 else if (strEQ(s,"__WARN__"))
1459 Perl_croak(aTHX_ "No such hook: %s", s);
1462 if (*svp != PERL_WARNHOOK_FATAL)
1468 i = whichsig(s); /* ...no, a brick */
1470 if (ckWARN(WARN_SIGNAL))
1471 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1474 #ifdef HAS_SIGPROCMASK
1475 /* Avoid having the signal arrive at a bad time, if possible. */
1478 sigprocmask(SIG_BLOCK, &set, &save);
1480 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1481 SAVEFREESV(save_sv);
1482 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1485 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1486 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1488 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1489 PL_sig_ignoring[i] = 0;
1491 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1492 PL_sig_defaulting[i] = 0;
1494 SvREFCNT_dec(PL_psig_name[i]);
1495 to_dec = PL_psig_ptr[i];
1496 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1497 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1498 PL_psig_name[i] = newSVpvn(s, len);
1499 SvREADONLY_on(PL_psig_name[i]);
1501 if (isGV_with_GP(sv) || SvROK(sv)) {
1503 (void)rsignal(i, PL_csighandlerp);
1504 #ifdef HAS_SIGPROCMASK
1509 *svp = SvREFCNT_inc_simple_NN(sv);
1511 SvREFCNT_dec(to_dec);
1514 s = SvOK(sv) ? SvPV_force(sv,len) : "DEFAULT";
1515 if (strEQ(s,"IGNORE")) {
1517 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1518 PL_sig_ignoring[i] = 1;
1519 (void)rsignal(i, PL_csighandlerp);
1521 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1525 else if (strEQ(s,"DEFAULT") || !*s) {
1527 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1528 PL_sig_defaulting[i] = 1;
1529 (void)rsignal(i, PL_csighandlerp);
1531 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1537 * We should warn if HINT_STRICT_REFS, but without
1538 * access to a known hint bit in a known OP, we can't
1539 * tell whether HINT_STRICT_REFS is in force or not.
1541 if (!strchr(s,':') && !strchr(s,'\''))
1542 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1545 (void)rsignal(i, PL_csighandlerp);
1547 *svp = SvREFCNT_inc_simple_NN(sv);
1549 #ifdef HAS_SIGPROCMASK
1554 SvREFCNT_dec(to_dec);
1557 #endif /* !PERL_MICRO */
1560 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1565 PERL_ARGS_ASSERT_MAGIC_SETISA;
1566 PERL_UNUSED_ARG(sv);
1568 /* Bail out if destruction is going on */
1569 if(PL_dirty) return 0;
1571 /* Skip _isaelem because _isa will handle it shortly */
1572 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1575 /* XXX Once it's possible, we need to
1576 detect that our @ISA is aliased in
1577 other stashes, and act on the stashes
1578 of all of the aliases */
1580 /* The first case occurs via setisa,
1581 the second via setisa_elem, which
1582 calls this same magic */
1584 SvTYPE(mg->mg_obj) == SVt_PVGV
1585 ? (const GV *)mg->mg_obj
1586 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1590 mro_isa_changed_in(stash);
1596 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1601 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1603 /* Bail out if destruction is going on */
1604 if(PL_dirty) return 0;
1606 av_clear(MUTABLE_AV(sv));
1608 /* XXX see comments in magic_setisa */
1610 SvTYPE(mg->mg_obj) == SVt_PVGV
1611 ? (const GV *)mg->mg_obj
1612 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1616 mro_isa_changed_in(stash);
1622 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1625 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1626 PERL_UNUSED_ARG(sv);
1627 PERL_UNUSED_ARG(mg);
1628 PL_amagic_generation++;
1634 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1636 HV * const hv = MUTABLE_HV(LvTARG(sv));
1639 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1640 PERL_UNUSED_ARG(mg);
1643 (void) hv_iterinit(hv);
1644 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1647 while (hv_iternext(hv))
1652 sv_setiv(sv, (IV)i);
1657 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1659 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1660 PERL_UNUSED_ARG(mg);
1662 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1667 /* caller is responsible for stack switching/cleanup */
1669 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1674 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1678 PUSHs(SvTIED_obj(sv, mg));
1681 if (mg->mg_len >= 0)
1682 mPUSHp(mg->mg_ptr, mg->mg_len);
1683 else if (mg->mg_len == HEf_SVKEY)
1684 PUSHs(MUTABLE_SV(mg->mg_ptr));
1686 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1695 return call_method(meth, flags);
1699 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1703 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1707 PUSHSTACKi(PERLSI_MAGIC);
1709 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1710 sv_setsv(sv, *PL_stack_sp--);
1720 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1722 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1725 mg->mg_flags |= MGf_GSKIP;
1726 magic_methpack(sv,mg,"FETCH");
1731 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1735 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1738 PUSHSTACKi(PERLSI_MAGIC);
1739 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1746 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1748 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1750 return magic_methpack(sv,mg,"DELETE");
1755 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1760 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1764 PUSHSTACKi(PERLSI_MAGIC);
1765 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1766 sv = *PL_stack_sp--;
1767 retval = SvIV(sv)-1;
1769 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1774 return (U32) retval;
1778 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1782 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1785 PUSHSTACKi(PERLSI_MAGIC);
1787 XPUSHs(SvTIED_obj(sv, mg));
1789 call_method("CLEAR", G_SCALAR|G_DISCARD);
1797 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1800 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1802 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1806 PUSHSTACKi(PERLSI_MAGIC);
1809 PUSHs(SvTIED_obj(sv, mg));
1814 if (call_method(meth, G_SCALAR))
1815 sv_setsv(key, *PL_stack_sp--);
1824 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1826 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1828 return magic_methpack(sv,mg,"EXISTS");
1832 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1836 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1837 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1839 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1841 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1843 if (HvEITER_get(hv))
1844 /* we are in an iteration so the hash cannot be empty */
1846 /* no xhv_eiter so now use FIRSTKEY */
1847 key = sv_newmortal();
1848 magic_nextpack(MUTABLE_SV(hv), mg, key);
1849 HvEITER_set(hv, NULL); /* need to reset iterator */
1850 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1853 /* there is a SCALAR method that we can call */
1855 PUSHSTACKi(PERLSI_MAGIC);
1861 if (call_method("SCALAR", G_SCALAR))
1862 retval = *PL_stack_sp--;
1864 retval = &PL_sv_undef;
1871 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1874 GV * const gv = PL_DBline;
1875 const I32 i = SvTRUE(sv);
1876 SV ** const svp = av_fetch(GvAV(gv),
1877 atoi(MgPV_nolen_const(mg)), FALSE);
1879 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1881 if (svp && SvIOKp(*svp)) {
1882 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1884 /* set or clear breakpoint in the relevant control op */
1886 o->op_flags |= OPf_SPECIAL;
1888 o->op_flags &= ~OPf_SPECIAL;
1895 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1898 AV * const obj = MUTABLE_AV(mg->mg_obj);
1900 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1903 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1911 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1914 AV * const obj = MUTABLE_AV(mg->mg_obj);
1916 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1919 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1921 if (ckWARN(WARN_MISC))
1922 Perl_warner(aTHX_ packWARN(WARN_MISC),
1923 "Attempt to set length of freed array");
1929 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1933 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1934 PERL_UNUSED_ARG(sv);
1936 /* during global destruction, mg_obj may already have been freed */
1937 if (PL_in_clean_all)
1940 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1943 /* arylen scalar holds a pointer back to the array, but doesn't own a
1944 reference. Hence the we (the array) are about to go away with it
1945 still pointing at us. Clear its pointer, else it would be pointing
1946 at free memory. See the comment in sv_magic about reference loops,
1947 and why it can't own a reference to us. */
1954 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1957 SV* const lsv = LvTARG(sv);
1959 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1960 PERL_UNUSED_ARG(mg);
1962 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1963 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1964 if (found && found->mg_len >= 0) {
1965 I32 i = found->mg_len;
1967 sv_pos_b2u(lsv, &i);
1968 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1977 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1980 SV* const lsv = LvTARG(sv);
1986 PERL_ARGS_ASSERT_MAGIC_SETPOS;
1987 PERL_UNUSED_ARG(mg);
1989 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1990 found = mg_find(lsv, PERL_MAGIC_regex_global);
1996 #ifdef PERL_OLD_COPY_ON_WRITE
1998 sv_force_normal_flags(lsv, 0);
2000 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2003 else if (!SvOK(sv)) {
2007 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2009 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2012 ulen = sv_len_utf8(lsv);
2022 else if (pos > (SSize_t)len)
2027 sv_pos_u2b(lsv, &p, 0);
2031 found->mg_len = pos;
2032 found->mg_flags &= ~MGf_MINMATCH;
2038 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2041 SV * const lsv = LvTARG(sv);
2042 const char * const tmps = SvPV_const(lsv,len);
2043 I32 offs = LvTARGOFF(sv);
2044 I32 rem = LvTARGLEN(sv);
2046 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2047 PERL_UNUSED_ARG(mg);
2050 sv_pos_u2b(lsv, &offs, &rem);
2051 if (offs > (I32)len)
2053 if (rem + offs > (I32)len)
2055 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2062 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2066 const char * const tmps = SvPV_const(sv, len);
2067 SV * const lsv = LvTARG(sv);
2068 I32 lvoff = LvTARGOFF(sv);
2069 I32 lvlen = LvTARGLEN(sv);
2071 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2072 PERL_UNUSED_ARG(mg);
2075 sv_utf8_upgrade(lsv);
2076 sv_pos_u2b(lsv, &lvoff, &lvlen);
2077 sv_insert(lsv, lvoff, lvlen, tmps, len);
2078 LvTARGLEN(sv) = sv_len_utf8(sv);
2081 else if (lsv && SvUTF8(lsv)) {
2083 sv_pos_u2b(lsv, &lvoff, &lvlen);
2084 LvTARGLEN(sv) = len;
2085 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2086 sv_insert(lsv, lvoff, lvlen, utf8, len);
2090 sv_insert(lsv, lvoff, lvlen, tmps, len);
2091 LvTARGLEN(sv) = len;
2099 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2103 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2104 PERL_UNUSED_ARG(sv);
2106 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2111 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2115 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2116 PERL_UNUSED_ARG(sv);
2118 /* update taint status */
2127 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2129 SV * const lsv = LvTARG(sv);
2131 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2132 PERL_UNUSED_ARG(mg);
2135 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2143 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2145 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2146 PERL_UNUSED_ARG(mg);
2147 do_vecset(sv); /* XXX slurp this routine */
2152 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2157 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2159 if (LvTARGLEN(sv)) {
2161 SV * const ahv = LvTARG(sv);
2162 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2167 AV *const av = MUTABLE_AV(LvTARG(sv));
2168 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2169 targ = AvARRAY(av)[LvTARGOFF(sv)];
2171 if (targ && (targ != &PL_sv_undef)) {
2172 /* somebody else defined it for us */
2173 SvREFCNT_dec(LvTARG(sv));
2174 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2176 SvREFCNT_dec(mg->mg_obj);
2178 mg->mg_flags &= ~MGf_REFCOUNTED;
2183 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2188 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2190 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2191 PERL_UNUSED_ARG(mg);
2195 sv_setsv(LvTARG(sv), sv);
2196 SvSETMAGIC(LvTARG(sv));
2202 Perl_vivify_defelem(pTHX_ SV *sv)
2208 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2210 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2213 SV * const ahv = LvTARG(sv);
2214 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2217 if (!value || value == &PL_sv_undef)
2218 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2221 AV *const av = MUTABLE_AV(LvTARG(sv));
2222 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2223 LvTARG(sv) = NULL; /* array can't be extended */
2225 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2226 if (!svp || (value = *svp) == &PL_sv_undef)
2227 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2230 SvREFCNT_inc_simple_void(value);
2231 SvREFCNT_dec(LvTARG(sv));
2234 SvREFCNT_dec(mg->mg_obj);
2236 mg->mg_flags &= ~MGf_REFCOUNTED;
2240 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2242 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2243 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2247 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2249 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2250 PERL_UNUSED_CONTEXT;
2257 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2259 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2261 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2263 if (uf && uf->uf_set)
2264 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2269 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2271 const char type = mg->mg_type;
2273 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2275 if (type == PERL_MAGIC_qr) {
2276 } else if (type == PERL_MAGIC_bm) {
2280 assert(type == PERL_MAGIC_fm);
2283 return sv_unmagic(sv, type);
2286 #ifdef USE_LOCALE_COLLATE
2288 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2290 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2293 * RenE<eacute> Descartes said "I think not."
2294 * and vanished with a faint plop.
2296 PERL_UNUSED_CONTEXT;
2297 PERL_UNUSED_ARG(sv);
2299 Safefree(mg->mg_ptr);
2305 #endif /* USE_LOCALE_COLLATE */
2307 /* Just clear the UTF-8 cache data. */
2309 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2311 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2312 PERL_UNUSED_CONTEXT;
2313 PERL_UNUSED_ARG(sv);
2314 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2316 mg->mg_len = -1; /* The mg_len holds the len cache. */
2321 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2324 register const char *s;
2326 register const REGEXP * rx;
2327 const char * const remaining = mg->mg_ptr + 1;
2331 PERL_ARGS_ASSERT_MAGIC_SET;
2333 switch (*mg->mg_ptr) {
2334 case '\015': /* $^MATCH */
2335 if (strEQ(remaining, "ATCH"))
2337 case '`': /* ${^PREMATCH} caught below */
2339 paren = RX_BUFF_IDX_PREMATCH;
2341 case '\'': /* ${^POSTMATCH} caught below */
2343 paren = RX_BUFF_IDX_POSTMATCH;
2347 paren = RX_BUFF_IDX_FULLMATCH;
2349 case '1': case '2': case '3': case '4':
2350 case '5': case '6': case '7': case '8': case '9':
2351 paren = atoi(mg->mg_ptr);
2353 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2354 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2357 /* Croak with a READONLY error when a numbered match var is
2358 * set without a previous pattern match. Unless it's C<local $1>
2360 if (!PL_localizing) {
2361 Perl_croak(aTHX_ "%s", PL_no_modify);
2364 case '\001': /* ^A */
2365 sv_setsv(PL_bodytarget, sv);
2367 case '\003': /* ^C */
2368 PL_minus_c = (bool)SvIV(sv);
2371 case '\004': /* ^D */
2373 s = SvPV_nolen_const(sv);
2374 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2375 DEBUG_x(dump_all());
2377 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2380 case '\005': /* ^E */
2381 if (*(mg->mg_ptr+1) == '\0') {
2383 set_vaxc_errno(SvIV(sv));
2386 SetLastError( SvIV(sv) );
2389 os2_setsyserrno(SvIV(sv));
2391 /* will anyone ever use this? */
2392 SETERRNO(SvIV(sv), 4);
2397 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2399 SvREFCNT_dec(PL_encoding);
2400 if (SvOK(sv) || SvGMAGICAL(sv)) {
2401 PL_encoding = newSVsv(sv);
2408 case '\006': /* ^F */
2409 PL_maxsysfd = SvIV(sv);
2411 case '\010': /* ^H */
2412 PL_hints = SvIV(sv);
2414 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2415 Safefree(PL_inplace);
2416 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2418 case '\017': /* ^O */
2419 if (*(mg->mg_ptr+1) == '\0') {
2420 Safefree(PL_osname);
2423 TAINT_PROPER("assigning to $^O");
2424 PL_osname = savesvpv(sv);
2427 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2429 const char *const start = SvPV(sv, len);
2430 const char *out = (const char*)memchr(start, '\0', len);
2432 struct refcounted_he *tmp_he;
2435 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2437 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2439 /* Opening for input is more common than opening for output, so
2440 ensure that hints for input are sooner on linked list. */
2441 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2442 SVs_TEMP | SvUTF8(sv))
2443 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
2446 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2447 newSVpvs_flags("open>", SVs_TEMP),
2450 /* The UTF-8 setting is carried over */
2451 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2453 PL_compiling.cop_hints_hash
2454 = Perl_refcounted_he_new(aTHX_ tmp_he,
2455 newSVpvs_flags("open<", SVs_TEMP),
2459 case '\020': /* ^P */
2460 if (*remaining == '\0') { /* ^P */
2461 PL_perldb = SvIV(sv);
2462 if (PL_perldb && !PL_DBsingle)
2465 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2467 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2470 case '\024': /* ^T */
2472 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2474 PL_basetime = (Time_t)SvIV(sv);
2477 case '\025': /* ^UTF8CACHE */
2478 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2479 PL_utf8cache = (signed char) sv_2iv(sv);
2482 case '\027': /* ^W & $^WARNING_BITS */
2483 if (*(mg->mg_ptr+1) == '\0') {
2484 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2486 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2487 | (i ? G_WARN_ON : G_WARN_OFF) ;
2490 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2491 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2492 if (!SvPOK(sv) && PL_localizing) {
2493 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2494 PL_compiling.cop_warnings = pWARN_NONE;
2499 int accumulate = 0 ;
2500 int any_fatals = 0 ;
2501 const char * const ptr = SvPV_const(sv, len) ;
2502 for (i = 0 ; i < len ; ++i) {
2503 accumulate |= ptr[i] ;
2504 any_fatals |= (ptr[i] & 0xAA) ;
2507 if (!specialWARN(PL_compiling.cop_warnings))
2508 PerlMemShared_free(PL_compiling.cop_warnings);
2509 PL_compiling.cop_warnings = pWARN_NONE;
2511 /* Yuck. I can't see how to abstract this: */
2512 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2513 WARN_ALL) && !any_fatals) {
2514 if (!specialWARN(PL_compiling.cop_warnings))
2515 PerlMemShared_free(PL_compiling.cop_warnings);
2516 PL_compiling.cop_warnings = pWARN_ALL;
2517 PL_dowarn |= G_WARN_ONCE ;
2521 const char *const p = SvPV_const(sv, len);
2523 PL_compiling.cop_warnings
2524 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2527 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2528 PL_dowarn |= G_WARN_ONCE ;
2536 if (PL_localizing) {
2537 if (PL_localizing == 1)
2538 SAVESPTR(PL_last_in_gv);
2540 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2541 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2544 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2545 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2546 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2549 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2550 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2551 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2554 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2557 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2558 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2559 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2562 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2566 IO * const io = GvIOp(PL_defoutgv);
2569 if ((SvIV(sv)) == 0)
2570 IoFLAGS(io) &= ~IOf_FLUSH;
2572 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2573 PerlIO *ofp = IoOFP(io);
2575 (void)PerlIO_flush(ofp);
2576 IoFLAGS(io) |= IOf_FLUSH;
2582 SvREFCNT_dec(PL_rs);
2583 PL_rs = newSVsv(sv);
2587 SvREFCNT_dec(PL_ors_sv);
2588 if (SvOK(sv) || SvGMAGICAL(sv)) {
2589 PL_ors_sv = newSVsv(sv);
2596 CopARYBASE_set(&PL_compiling, SvIV(sv));
2599 #ifdef COMPLEX_STATUS
2600 if (PL_localizing == 2) {
2601 PL_statusvalue = LvTARGOFF(sv);
2602 PL_statusvalue_vms = LvTARGLEN(sv);
2606 #ifdef VMSISH_STATUS
2608 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2611 STATUS_UNIX_EXIT_SET(SvIV(sv));
2616 # define PERL_VMS_BANG vaxc$errno
2618 # define PERL_VMS_BANG 0
2620 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2621 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2626 if (PL_delaymagic) {
2627 PL_delaymagic |= DM_RUID;
2628 break; /* don't do magic till later */
2631 (void)setruid((Uid_t)PL_uid);
2634 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2636 #ifdef HAS_SETRESUID
2637 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2639 if (PL_uid == PL_euid) { /* special case $< = $> */
2641 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2642 if (PL_uid != 0 && PerlProc_getuid() == 0)
2643 (void)PerlProc_setuid(0);
2645 (void)PerlProc_setuid(PL_uid);
2647 PL_uid = PerlProc_getuid();
2648 Perl_croak(aTHX_ "setruid() not implemented");
2653 PL_uid = PerlProc_getuid();
2654 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2658 if (PL_delaymagic) {
2659 PL_delaymagic |= DM_EUID;
2660 break; /* don't do magic till later */
2663 (void)seteuid((Uid_t)PL_euid);
2666 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2668 #ifdef HAS_SETRESUID
2669 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2671 if (PL_euid == PL_uid) /* special case $> = $< */
2672 PerlProc_setuid(PL_euid);
2674 PL_euid = PerlProc_geteuid();
2675 Perl_croak(aTHX_ "seteuid() not implemented");
2680 PL_euid = PerlProc_geteuid();
2681 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2685 if (PL_delaymagic) {
2686 PL_delaymagic |= DM_RGID;
2687 break; /* don't do magic till later */
2690 (void)setrgid((Gid_t)PL_gid);
2693 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2695 #ifdef HAS_SETRESGID
2696 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2698 if (PL_gid == PL_egid) /* special case $( = $) */
2699 (void)PerlProc_setgid(PL_gid);
2701 PL_gid = PerlProc_getgid();
2702 Perl_croak(aTHX_ "setrgid() not implemented");
2707 PL_gid = PerlProc_getgid();
2708 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2711 #ifdef HAS_SETGROUPS
2713 const char *p = SvPV_const(sv, len);
2714 Groups_t *gary = NULL;
2719 for (i = 0; i < NGROUPS; ++i) {
2720 while (*p && !isSPACE(*p))
2727 Newx(gary, i + 1, Groups_t);
2729 Renew(gary, i + 1, Groups_t);
2733 (void)setgroups(i, gary);
2736 #else /* HAS_SETGROUPS */
2738 #endif /* HAS_SETGROUPS */
2739 if (PL_delaymagic) {
2740 PL_delaymagic |= DM_EGID;
2741 break; /* don't do magic till later */
2744 (void)setegid((Gid_t)PL_egid);
2747 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2749 #ifdef HAS_SETRESGID
2750 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2752 if (PL_egid == PL_gid) /* special case $) = $( */
2753 (void)PerlProc_setgid(PL_egid);
2755 PL_egid = PerlProc_getegid();
2756 Perl_croak(aTHX_ "setegid() not implemented");
2761 PL_egid = PerlProc_getegid();
2762 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2765 PL_chopset = SvPV_force(sv,len);
2768 LOCK_DOLLARZERO_MUTEX;
2769 #ifdef HAS_SETPROCTITLE
2770 /* The BSDs don't show the argv[] in ps(1) output, they
2771 * show a string from the process struct and provide
2772 * the setproctitle() routine to manipulate that. */
2773 if (PL_origalen != 1) {
2774 s = SvPV_const(sv, len);
2775 # if __FreeBSD_version > 410001
2776 /* The leading "-" removes the "perl: " prefix,
2777 * but not the "(perl) suffix from the ps(1)
2778 * output, because that's what ps(1) shows if the
2779 * argv[] is modified. */
2780 setproctitle("-%s", s);
2781 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2782 /* This doesn't really work if you assume that
2783 * $0 = 'foobar'; will wipe out 'perl' from the $0
2784 * because in ps(1) output the result will be like
2785 * sprintf("perl: %s (perl)", s)
2786 * I guess this is a security feature:
2787 * one (a user process) cannot get rid of the original name.
2789 setproctitle("%s", s);
2792 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2793 if (PL_origalen != 1) {
2795 s = SvPV_const(sv, len);
2796 un.pst_command = (char *)s;
2797 pstat(PSTAT_SETCMD, un, len, 0, 0);
2800 if (PL_origalen > 1) {
2801 /* PL_origalen is set in perl_parse(). */
2802 s = SvPV_force(sv,len);
2803 if (len >= (STRLEN)PL_origalen-1) {
2804 /* Longer than original, will be truncated. We assume that
2805 * PL_origalen bytes are available. */
2806 Copy(s, PL_origargv[0], PL_origalen-1, char);
2809 /* Shorter than original, will be padded. */
2811 /* Special case for Mac OS X: see [perl #38868] */
2814 /* Is the space counterintuitive? Yes.
2815 * (You were expecting \0?)
2816 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2818 const int pad = ' ';
2820 Copy(s, PL_origargv[0], len, char);
2821 PL_origargv[0][len] = 0;
2822 memset(PL_origargv[0] + len + 1,
2823 pad, PL_origalen - len - 1);
2825 PL_origargv[0][PL_origalen-1] = 0;
2826 for (i = 1; i < PL_origargc; i++)
2830 UNLOCK_DOLLARZERO_MUTEX;
2837 Perl_whichsig(pTHX_ const char *sig)
2839 register char* const* sigv;
2841 PERL_ARGS_ASSERT_WHICHSIG;
2842 PERL_UNUSED_CONTEXT;
2844 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2845 if (strEQ(sig,*sigv))
2846 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2848 if (strEQ(sig,"CHLD"))
2852 if (strEQ(sig,"CLD"))
2859 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2860 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2862 Perl_sighandler(int sig)
2865 #ifdef PERL_GET_SIG_CONTEXT
2866 dTHXa(PERL_GET_SIG_CONTEXT);
2873 SV * const tSv = PL_Sv;
2877 XPV * const tXpv = PL_Xpv;
2879 if (PL_savestack_ix + 15 <= PL_savestack_max)
2881 if (PL_markstack_ptr < PL_markstack_max - 2)
2883 if (PL_scopestack_ix < PL_scopestack_max - 3)
2886 if (!PL_psig_ptr[sig]) {
2887 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2892 /* Max number of items pushed there is 3*n or 4. We cannot fix
2893 infinity, so we fix 4 (in fact 5): */
2895 PL_savestack_ix += 5; /* Protect save in progress. */
2896 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2899 PL_markstack_ptr++; /* Protect mark. */
2901 PL_scopestack_ix += 1;
2902 /* sv_2cv is too complicated, try a simpler variant first: */
2903 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2904 || SvTYPE(cv) != SVt_PVCV) {
2906 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2909 if (!cv || !CvROOT(cv)) {
2910 if (ckWARN(WARN_SIGNAL))
2911 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2912 PL_sig_name[sig], (gv ? GvENAME(gv)
2919 if(PL_psig_name[sig]) {
2920 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2922 #if !defined(PERL_IMPLICIT_CONTEXT)
2926 sv = sv_newmortal();
2927 sv_setpv(sv,PL_sig_name[sig]);
2930 PUSHSTACKi(PERLSI_SIGNAL);
2933 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2935 struct sigaction oact;
2937 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2940 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2941 /* The siginfo fields signo, code, errno, pid, uid,
2942 * addr, status, and band are defined by POSIX/SUSv3. */
2943 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2944 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2945 #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. */
2946 hv_stores(sih, "errno", newSViv(sip->si_errno));
2947 hv_stores(sih, "status", newSViv(sip->si_status));
2948 hv_stores(sih, "uid", newSViv(sip->si_uid));
2949 hv_stores(sih, "pid", newSViv(sip->si_pid));
2950 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2951 hv_stores(sih, "band", newSViv(sip->si_band));
2955 mPUSHp((char *)sip, sizeof(*sip));
2963 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2966 if (SvTRUE(ERRSV)) {
2968 #ifdef HAS_SIGPROCMASK
2969 /* Handler "died", for example to get out of a restart-able read().
2970 * Before we re-do that on its behalf re-enable the signal which was
2971 * blocked by the system when we entered.
2975 sigaddset(&set,sig);
2976 sigprocmask(SIG_UNBLOCK, &set, NULL);
2978 /* Not clear if this will work */
2979 (void)rsignal(sig, SIG_IGN);
2980 (void)rsignal(sig, PL_csighandlerp);
2982 #endif /* !PERL_MICRO */
2983 Perl_die(aTHX_ NULL);
2987 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2991 PL_scopestack_ix -= 1;
2994 PL_op = myop; /* Apparently not needed... */
2996 PL_Sv = tSv; /* Restore global temporaries. */
3003 S_restore_magic(pTHX_ const void *p)
3006 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3007 SV* const sv = mgs->mgs_sv;
3012 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3014 #ifdef PERL_OLD_COPY_ON_WRITE
3015 /* While magic was saved (and off) sv_setsv may well have seen
3016 this SV as a prime candidate for COW. */
3018 sv_force_normal_flags(sv, 0);
3022 SvFLAGS(sv) |= mgs->mgs_flags;
3025 if (SvGMAGICAL(sv)) {
3026 /* downgrade public flags to private,
3027 and discard any other private flags */
3029 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3031 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3032 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3037 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3039 /* If we're still on top of the stack, pop us off. (That condition
3040 * will be satisfied if restore_magic was called explicitly, but *not*
3041 * if it's being called via leave_scope.)
3042 * The reason for doing this is that otherwise, things like sv_2cv()
3043 * may leave alloc gunk on the savestack, and some code
3044 * (e.g. sighandler) doesn't expect that...
3046 if (PL_savestack_ix == mgs->mgs_ss_ix)
3048 I32 popval = SSPOPINT;
3049 assert(popval == SAVEt_DESTRUCTOR_X);
3050 PL_savestack_ix -= 2;
3052 assert(popval == SAVEt_ALLOC);
3054 PL_savestack_ix -= popval;
3060 S_unwind_handler_stack(pTHX_ const void *p)
3063 const U32 flags = *(const U32*)p;
3065 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3068 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3069 #if !defined(PERL_IMPLICIT_CONTEXT)
3071 SvREFCNT_dec(PL_sig_sv);
3076 =for apidoc magic_sethint
3078 Triggered by a store to %^H, records the key/value pair to
3079 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3080 anything that would need a deep copy. Maybe we should warn if we find a
3086 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3089 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3090 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3092 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3094 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3095 an alternative leaf in there, with PL_compiling.cop_hints being used if
3096 it's NULL. If needed for threads, the alternative could lock a mutex,
3097 or take other more complex action. */
3099 /* Something changed in %^H, so it will need to be restored on scope exit.
3100 Doing this here saves a lot of doing it manually in perl code (and
3101 forgetting to do it, and consequent subtle errors. */
3102 PL_hints |= HINT_LOCALIZE_HH;
3103 PL_compiling.cop_hints_hash
3104 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3109 =for apidoc magic_clearhint
3111 Triggered by a delete from %^H, records the key to
3112 C<PL_compiling.cop_hints_hash>.
3117 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3121 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3122 PERL_UNUSED_ARG(sv);
3124 assert(mg->mg_len == HEf_SVKEY);
3126 PERL_UNUSED_ARG(sv);
3128 PL_hints |= HINT_LOCALIZE_HH;
3129 PL_compiling.cop_hints_hash
3130 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3131 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3137 * c-indentation-style: bsd
3139 * indent-tabs-mode: t
3142 * ex: set ts=8 sts=4 sw=4 noet: