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); /* $& is in [0] */
930 CALLREG_NUMBUF_FETCH(rx,paren,sv);
933 sv_setsv(sv,&PL_sv_undef);
937 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
938 if (RX_LASTPAREN(rx)) {
939 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
943 sv_setsv(sv,&PL_sv_undef);
945 case '\016': /* ^N */
946 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
947 if (RX_LASTCLOSEPAREN(rx)) {
948 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
953 sv_setsv(sv,&PL_sv_undef);
957 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
958 CALLREG_NUMBUF_FETCH(rx,-2,sv);
961 sv_setsv(sv,&PL_sv_undef);
965 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
966 CALLREG_NUMBUF_FETCH(rx,-1,sv);
969 sv_setsv(sv,&PL_sv_undef);
972 if (GvIO(PL_last_in_gv)) {
973 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
978 sv_setiv(sv, (IV)STATUS_CURRENT);
979 #ifdef COMPLEX_STATUS
980 LvTARGOFF(sv) = PL_statusvalue;
981 LvTARGLEN(sv) = PL_statusvalue_vms;
986 if (GvIOp(PL_defoutgv))
987 s = IoTOP_NAME(GvIOp(PL_defoutgv));
991 sv_setpv(sv,GvENAME(PL_defoutgv));
992 sv_catpvs(sv,"_TOP");
996 if (GvIOp(PL_defoutgv))
997 s = IoFMT_NAME(GvIOp(PL_defoutgv));
999 s = GvENAME(PL_defoutgv);
1003 if (GvIOp(PL_defoutgv))
1004 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1007 if (GvIOp(PL_defoutgv))
1008 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1011 if (GvIOp(PL_defoutgv))
1012 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1019 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1022 if (GvIOp(PL_defoutgv))
1023 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1027 sv_copypv(sv, PL_ors_sv);
1031 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1032 sv_setpv(sv, errno ? Strerror(errno) : "");
1036 sv_setnv(sv, (NV)errno);
1038 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1039 sv_setpv(sv, os2error(Perl_rc));
1042 sv_setpv(sv, errno ? Strerror(errno) : "");
1047 SvNOK_on(sv); /* what a wonderful hack! */
1050 sv_setiv(sv, (IV)PL_uid);
1053 sv_setiv(sv, (IV)PL_euid);
1056 sv_setiv(sv, (IV)PL_gid);
1059 sv_setiv(sv, (IV)PL_egid);
1061 #ifdef HAS_GETGROUPS
1063 Groups_t *gary = NULL;
1064 I32 i, num_groups = getgroups(0, gary);
1065 Newx(gary, num_groups, Groups_t);
1066 num_groups = getgroups(num_groups, gary);
1067 for (i = 0; i < num_groups; i++)
1068 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1071 (void)SvIOK_on(sv); /* what a wonderful hack! */
1081 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1083 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1085 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1087 if (uf && uf->uf_val)
1088 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1093 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1096 STRLEN len = 0, klen;
1097 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1098 const char * const ptr = MgPV_const(mg,klen);
1101 PERL_ARGS_ASSERT_MAGIC_SETENV;
1103 #ifdef DYNAMIC_ENV_FETCH
1104 /* We just undefd an environment var. Is a replacement */
1105 /* waiting in the wings? */
1107 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1109 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1113 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1114 /* And you'll never guess what the dog had */
1115 /* in its mouth... */
1117 MgTAINTEDDIR_off(mg);
1119 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1120 char pathbuf[256], eltbuf[256], *cp, *elt;
1124 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1126 do { /* DCL$PATH may be a search list */
1127 while (1) { /* as may dev portion of any element */
1128 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1129 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1130 cando_by_name(S_IWUSR,0,elt) ) {
1131 MgTAINTEDDIR_on(mg);
1135 if ((cp = strchr(elt, ':')) != NULL)
1137 if (my_trnlnm(elt, eltbuf, j++))
1143 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1146 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1147 const char * const strend = s + len;
1149 while (s < strend) {
1153 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1154 const char path_sep = '|';
1156 const char path_sep = ':';
1158 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1159 s, strend, path_sep, &i);
1161 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1163 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1165 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1167 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1168 MgTAINTEDDIR_on(mg);
1174 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1180 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1182 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1183 PERL_UNUSED_ARG(sv);
1184 my_setenv(MgPV_nolen_const(mg),NULL);
1189 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1192 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1193 PERL_UNUSED_ARG(mg);
1195 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1197 if (PL_localizing) {
1200 hv_iterinit(MUTABLE_HV(sv));
1201 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1203 my_setenv(hv_iterkey(entry, &keylen),
1204 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1212 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1215 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1216 PERL_UNUSED_ARG(sv);
1217 PERL_UNUSED_ARG(mg);
1219 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1227 #ifdef HAS_SIGPROCMASK
1229 restore_sigmask(pTHX_ SV *save_sv)
1231 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1232 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1236 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1239 /* Are we fetching a signal entry? */
1240 const I32 i = whichsig(MgPV_nolen_const(mg));
1242 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1246 sv_setsv(sv,PL_psig_ptr[i]);
1248 Sighandler_t sigstate = rsignal_state(i);
1249 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1250 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1253 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1254 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1257 /* cache state so we don't fetch it again */
1258 if(sigstate == (Sighandler_t) SIG_IGN)
1259 sv_setpvs(sv,"IGNORE");
1261 sv_setsv(sv,&PL_sv_undef);
1262 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1269 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1271 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1272 PERL_UNUSED_ARG(sv);
1274 magic_setsig(NULL, mg);
1275 return sv_unmagic(sv, mg->mg_type);
1279 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1280 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1282 Perl_csighandler(int sig)
1285 #ifdef PERL_GET_SIG_CONTEXT
1286 dTHXa(PERL_GET_SIG_CONTEXT);
1290 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1291 (void) rsignal(sig, PL_csighandlerp);
1292 if (PL_sig_ignoring[sig]) return;
1294 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1295 if (PL_sig_defaulting[sig])
1296 #ifdef KILL_BY_SIGPRC
1297 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1312 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1313 /* Call the perl level handler now--
1314 * with risk we may be in malloc() etc. */
1315 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1316 (*PL_sighandlerp)(sig, NULL, NULL);
1318 (*PL_sighandlerp)(sig);
1321 /* Set a flag to say this signal is pending, that is awaiting delivery after
1322 * the current Perl opcode completes */
1323 PL_psig_pend[sig]++;
1325 #ifndef SIG_PENDING_DIE_COUNT
1326 # define SIG_PENDING_DIE_COUNT 120
1328 /* And one to say _a_ signal is pending */
1329 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1330 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1331 (unsigned long)SIG_PENDING_DIE_COUNT);
1335 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1337 Perl_csighandler_init(void)
1340 if (PL_sig_handlers_initted) return;
1342 for (sig = 1; sig < SIG_SIZE; sig++) {
1343 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1345 PL_sig_defaulting[sig] = 1;
1346 (void) rsignal(sig, PL_csighandlerp);
1348 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1349 PL_sig_ignoring[sig] = 0;
1352 PL_sig_handlers_initted = 1;
1357 Perl_despatch_signals(pTHX)
1362 for (sig = 1; sig < SIG_SIZE; sig++) {
1363 if (PL_psig_pend[sig]) {
1364 PERL_BLOCKSIG_ADD(set, sig);
1365 PL_psig_pend[sig] = 0;
1366 PERL_BLOCKSIG_BLOCK(set);
1367 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1368 (*PL_sighandlerp)(sig, NULL, NULL);
1370 (*PL_sighandlerp)(sig);
1372 PERL_BLOCKSIG_UNBLOCK(set);
1377 /* sv of NULL signifies that we're acting as magic_clearsig. */
1379 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1384 /* Need to be careful with SvREFCNT_dec(), because that can have side
1385 * effects (due to closures). We must make sure that the new disposition
1386 * is in place before it is called.
1390 #ifdef HAS_SIGPROCMASK
1394 register const char *s = MgPV_const(mg,len);
1396 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1399 if (strEQ(s,"__DIE__"))
1401 else if (strEQ(s,"__WARN__")
1402 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1403 /* Merge the existing behaviours, which are as follows:
1404 magic_setsig, we always set svp to &PL_warnhook
1405 (hence we always change the warnings handler)
1406 For magic_clearsig, we don't change the warnings handler if it's
1407 set to the &PL_warnhook. */
1410 Perl_croak(aTHX_ "No such hook: %s", s);
1413 if (*svp != PERL_WARNHOOK_FATAL)
1419 i = whichsig(s); /* ...no, a brick */
1421 if (sv && ckWARN(WARN_SIGNAL))
1422 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1425 #ifdef HAS_SIGPROCMASK
1426 /* Avoid having the signal arrive at a bad time, if possible. */
1429 sigprocmask(SIG_BLOCK, &set, &save);
1431 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1432 SAVEFREESV(save_sv);
1433 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1436 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1437 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1439 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1440 PL_sig_ignoring[i] = 0;
1442 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1443 PL_sig_defaulting[i] = 0;
1445 to_dec = PL_psig_ptr[i];
1447 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1448 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1450 /* Signals don't change name during the program's execution, so once
1451 they're cached in the appropriate slot of PL_psig_name, they can
1454 Ideally we'd find some way of making SVs at (C) compile time, or
1455 at least, doing most of the work. */
1456 if (!PL_psig_name[i]) {
1457 PL_psig_name[i] = newSVpvn(s, len);
1458 SvREADONLY_on(PL_psig_name[i]);
1461 SvREFCNT_dec(PL_psig_name[i]);
1462 PL_psig_name[i] = NULL;
1463 PL_psig_ptr[i] = NULL;
1466 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1468 (void)rsignal(i, PL_csighandlerp);
1471 *svp = SvREFCNT_inc_simple_NN(sv);
1473 if (sv && SvOK(sv)) {
1474 s = SvPV_force(sv, len);
1478 if (sv && strEQ(s,"IGNORE")) {
1480 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1481 PL_sig_ignoring[i] = 1;
1482 (void)rsignal(i, PL_csighandlerp);
1484 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1488 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1490 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1491 PL_sig_defaulting[i] = 1;
1492 (void)rsignal(i, PL_csighandlerp);
1494 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1500 * We should warn if HINT_STRICT_REFS, but without
1501 * access to a known hint bit in a known OP, we can't
1502 * tell whether HINT_STRICT_REFS is in force or not.
1504 if (!strchr(s,':') && !strchr(s,'\''))
1505 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1508 (void)rsignal(i, PL_csighandlerp);
1510 *svp = SvREFCNT_inc_simple_NN(sv);
1514 #ifdef HAS_SIGPROCMASK
1519 SvREFCNT_dec(to_dec);
1522 #endif /* !PERL_MICRO */
1525 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1530 PERL_ARGS_ASSERT_MAGIC_SETISA;
1531 PERL_UNUSED_ARG(sv);
1533 /* Bail out if destruction is going on */
1534 if(PL_dirty) return 0;
1536 /* Skip _isaelem because _isa will handle it shortly */
1537 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1540 /* XXX Once it's possible, we need to
1541 detect that our @ISA is aliased in
1542 other stashes, and act on the stashes
1543 of all of the aliases */
1545 /* The first case occurs via setisa,
1546 the second via setisa_elem, which
1547 calls this same magic */
1549 SvTYPE(mg->mg_obj) == SVt_PVGV
1550 ? (const GV *)mg->mg_obj
1551 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1555 mro_isa_changed_in(stash);
1561 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1566 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1568 /* Bail out if destruction is going on */
1569 if(PL_dirty) return 0;
1571 av_clear(MUTABLE_AV(sv));
1573 /* XXX see comments in magic_setisa */
1575 SvTYPE(mg->mg_obj) == SVt_PVGV
1576 ? (const GV *)mg->mg_obj
1577 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1581 mro_isa_changed_in(stash);
1587 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1590 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1591 PERL_UNUSED_ARG(sv);
1592 PERL_UNUSED_ARG(mg);
1593 PL_amagic_generation++;
1599 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1601 HV * const hv = MUTABLE_HV(LvTARG(sv));
1604 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1605 PERL_UNUSED_ARG(mg);
1608 (void) hv_iterinit(hv);
1609 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1612 while (hv_iternext(hv))
1617 sv_setiv(sv, (IV)i);
1622 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1624 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1625 PERL_UNUSED_ARG(mg);
1627 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1632 /* caller is responsible for stack switching/cleanup */
1634 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1639 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1643 PUSHs(SvTIED_obj(sv, mg));
1646 if (mg->mg_len >= 0)
1647 mPUSHp(mg->mg_ptr, mg->mg_len);
1648 else if (mg->mg_len == HEf_SVKEY)
1649 PUSHs(MUTABLE_SV(mg->mg_ptr));
1651 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1660 return call_method(meth, flags);
1664 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1668 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1672 PUSHSTACKi(PERLSI_MAGIC);
1674 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1675 sv_setsv(sv, *PL_stack_sp--);
1685 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1687 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1690 mg->mg_flags |= MGf_GSKIP;
1691 magic_methpack(sv,mg,"FETCH");
1696 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1700 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1703 PUSHSTACKi(PERLSI_MAGIC);
1704 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1711 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1713 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1715 return magic_methpack(sv,mg,"DELETE");
1720 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1725 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1729 PUSHSTACKi(PERLSI_MAGIC);
1730 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1731 sv = *PL_stack_sp--;
1732 retval = SvIV(sv)-1;
1734 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1739 return (U32) retval;
1743 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1747 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1750 PUSHSTACKi(PERLSI_MAGIC);
1752 XPUSHs(SvTIED_obj(sv, mg));
1754 call_method("CLEAR", G_SCALAR|G_DISCARD);
1762 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1765 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1767 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1771 PUSHSTACKi(PERLSI_MAGIC);
1774 PUSHs(SvTIED_obj(sv, mg));
1779 if (call_method(meth, G_SCALAR))
1780 sv_setsv(key, *PL_stack_sp--);
1789 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1791 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1793 return magic_methpack(sv,mg,"EXISTS");
1797 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1801 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1802 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1804 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1806 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1808 if (HvEITER_get(hv))
1809 /* we are in an iteration so the hash cannot be empty */
1811 /* no xhv_eiter so now use FIRSTKEY */
1812 key = sv_newmortal();
1813 magic_nextpack(MUTABLE_SV(hv), mg, key);
1814 HvEITER_set(hv, NULL); /* need to reset iterator */
1815 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1818 /* there is a SCALAR method that we can call */
1820 PUSHSTACKi(PERLSI_MAGIC);
1826 if (call_method("SCALAR", G_SCALAR))
1827 retval = *PL_stack_sp--;
1829 retval = &PL_sv_undef;
1836 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1839 GV * const gv = PL_DBline;
1840 const I32 i = SvTRUE(sv);
1841 SV ** const svp = av_fetch(GvAV(gv),
1842 atoi(MgPV_nolen_const(mg)), FALSE);
1844 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1846 if (svp && SvIOKp(*svp)) {
1847 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1849 /* set or clear breakpoint in the relevant control op */
1851 o->op_flags |= OPf_SPECIAL;
1853 o->op_flags &= ~OPf_SPECIAL;
1860 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1863 AV * const obj = MUTABLE_AV(mg->mg_obj);
1865 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1868 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1876 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1879 AV * const obj = MUTABLE_AV(mg->mg_obj);
1881 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1884 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1886 if (ckWARN(WARN_MISC))
1887 Perl_warner(aTHX_ packWARN(WARN_MISC),
1888 "Attempt to set length of freed array");
1894 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1898 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1899 PERL_UNUSED_ARG(sv);
1901 /* during global destruction, mg_obj may already have been freed */
1902 if (PL_in_clean_all)
1905 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1908 /* arylen scalar holds a pointer back to the array, but doesn't own a
1909 reference. Hence the we (the array) are about to go away with it
1910 still pointing at us. Clear its pointer, else it would be pointing
1911 at free memory. See the comment in sv_magic about reference loops,
1912 and why it can't own a reference to us. */
1919 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1922 SV* const lsv = LvTARG(sv);
1924 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1925 PERL_UNUSED_ARG(mg);
1927 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1928 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1929 if (found && found->mg_len >= 0) {
1930 I32 i = found->mg_len;
1932 sv_pos_b2u(lsv, &i);
1933 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1942 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1945 SV* const lsv = LvTARG(sv);
1951 PERL_ARGS_ASSERT_MAGIC_SETPOS;
1952 PERL_UNUSED_ARG(mg);
1954 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1955 found = mg_find(lsv, PERL_MAGIC_regex_global);
1961 #ifdef PERL_OLD_COPY_ON_WRITE
1963 sv_force_normal_flags(lsv, 0);
1965 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
1968 else if (!SvOK(sv)) {
1972 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1974 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
1977 ulen = sv_len_utf8(lsv);
1987 else if (pos > (SSize_t)len)
1992 sv_pos_u2b(lsv, &p, 0);
1996 found->mg_len = pos;
1997 found->mg_flags &= ~MGf_MINMATCH;
2003 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2006 SV * const lsv = LvTARG(sv);
2007 const char * const tmps = SvPV_const(lsv,len);
2008 I32 offs = LvTARGOFF(sv);
2009 I32 rem = LvTARGLEN(sv);
2011 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2012 PERL_UNUSED_ARG(mg);
2015 sv_pos_u2b(lsv, &offs, &rem);
2016 if (offs > (I32)len)
2018 if (rem + offs > (I32)len)
2020 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2027 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2031 const char * const tmps = SvPV_const(sv, len);
2032 SV * const lsv = LvTARG(sv);
2033 I32 lvoff = LvTARGOFF(sv);
2034 I32 lvlen = LvTARGLEN(sv);
2036 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2037 PERL_UNUSED_ARG(mg);
2040 sv_utf8_upgrade(lsv);
2041 sv_pos_u2b(lsv, &lvoff, &lvlen);
2042 sv_insert(lsv, lvoff, lvlen, tmps, len);
2043 LvTARGLEN(sv) = sv_len_utf8(sv);
2046 else if (lsv && SvUTF8(lsv)) {
2048 sv_pos_u2b(lsv, &lvoff, &lvlen);
2049 LvTARGLEN(sv) = len;
2050 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2051 sv_insert(lsv, lvoff, lvlen, utf8, len);
2055 sv_insert(lsv, lvoff, lvlen, tmps, len);
2056 LvTARGLEN(sv) = len;
2064 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2068 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2069 PERL_UNUSED_ARG(sv);
2071 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2076 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2080 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2081 PERL_UNUSED_ARG(sv);
2083 /* update taint status */
2092 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2094 SV * const lsv = LvTARG(sv);
2096 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2097 PERL_UNUSED_ARG(mg);
2100 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2108 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2110 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2111 PERL_UNUSED_ARG(mg);
2112 do_vecset(sv); /* XXX slurp this routine */
2117 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2122 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2124 if (LvTARGLEN(sv)) {
2126 SV * const ahv = LvTARG(sv);
2127 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2132 AV *const av = MUTABLE_AV(LvTARG(sv));
2133 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2134 targ = AvARRAY(av)[LvTARGOFF(sv)];
2136 if (targ && (targ != &PL_sv_undef)) {
2137 /* somebody else defined it for us */
2138 SvREFCNT_dec(LvTARG(sv));
2139 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2141 SvREFCNT_dec(mg->mg_obj);
2143 mg->mg_flags &= ~MGf_REFCOUNTED;
2148 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2153 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2155 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2156 PERL_UNUSED_ARG(mg);
2160 sv_setsv(LvTARG(sv), sv);
2161 SvSETMAGIC(LvTARG(sv));
2167 Perl_vivify_defelem(pTHX_ SV *sv)
2173 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2175 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2178 SV * const ahv = LvTARG(sv);
2179 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2182 if (!value || value == &PL_sv_undef)
2183 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2186 AV *const av = MUTABLE_AV(LvTARG(sv));
2187 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2188 LvTARG(sv) = NULL; /* array can't be extended */
2190 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2191 if (!svp || (value = *svp) == &PL_sv_undef)
2192 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2195 SvREFCNT_inc_simple_void(value);
2196 SvREFCNT_dec(LvTARG(sv));
2199 SvREFCNT_dec(mg->mg_obj);
2201 mg->mg_flags &= ~MGf_REFCOUNTED;
2205 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2207 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2208 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2212 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2214 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2215 PERL_UNUSED_CONTEXT;
2222 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2224 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2226 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2228 if (uf && uf->uf_set)
2229 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2234 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2236 const char type = mg->mg_type;
2238 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2240 if (type == PERL_MAGIC_qr) {
2241 } else if (type == PERL_MAGIC_bm) {
2245 assert(type == PERL_MAGIC_fm);
2248 return sv_unmagic(sv, type);
2251 #ifdef USE_LOCALE_COLLATE
2253 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2255 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2258 * RenE<eacute> Descartes said "I think not."
2259 * and vanished with a faint plop.
2261 PERL_UNUSED_CONTEXT;
2262 PERL_UNUSED_ARG(sv);
2264 Safefree(mg->mg_ptr);
2270 #endif /* USE_LOCALE_COLLATE */
2272 /* Just clear the UTF-8 cache data. */
2274 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2276 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2277 PERL_UNUSED_CONTEXT;
2278 PERL_UNUSED_ARG(sv);
2279 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2281 mg->mg_len = -1; /* The mg_len holds the len cache. */
2286 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2289 register const char *s;
2291 register const REGEXP * rx;
2292 const char * const remaining = mg->mg_ptr + 1;
2296 PERL_ARGS_ASSERT_MAGIC_SET;
2298 switch (*mg->mg_ptr) {
2299 case '\015': /* $^MATCH */
2300 if (strEQ(remaining, "ATCH"))
2302 case '`': /* ${^PREMATCH} caught below */
2304 paren = RX_BUFF_IDX_PREMATCH;
2306 case '\'': /* ${^POSTMATCH} caught below */
2308 paren = RX_BUFF_IDX_POSTMATCH;
2312 paren = RX_BUFF_IDX_FULLMATCH;
2314 case '1': case '2': case '3': case '4':
2315 case '5': case '6': case '7': case '8': case '9':
2316 paren = atoi(mg->mg_ptr);
2318 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2319 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2322 /* Croak with a READONLY error when a numbered match var is
2323 * set without a previous pattern match. Unless it's C<local $1>
2325 if (!PL_localizing) {
2326 Perl_croak(aTHX_ "%s", PL_no_modify);
2329 case '\001': /* ^A */
2330 sv_setsv(PL_bodytarget, sv);
2332 case '\003': /* ^C */
2333 PL_minus_c = (bool)SvIV(sv);
2336 case '\004': /* ^D */
2338 s = SvPV_nolen_const(sv);
2339 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2340 DEBUG_x(dump_all());
2342 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2345 case '\005': /* ^E */
2346 if (*(mg->mg_ptr+1) == '\0') {
2348 set_vaxc_errno(SvIV(sv));
2351 SetLastError( SvIV(sv) );
2354 os2_setsyserrno(SvIV(sv));
2356 /* will anyone ever use this? */
2357 SETERRNO(SvIV(sv), 4);
2362 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2364 SvREFCNT_dec(PL_encoding);
2365 if (SvOK(sv) || SvGMAGICAL(sv)) {
2366 PL_encoding = newSVsv(sv);
2373 case '\006': /* ^F */
2374 PL_maxsysfd = SvIV(sv);
2376 case '\010': /* ^H */
2377 PL_hints = SvIV(sv);
2379 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2380 Safefree(PL_inplace);
2381 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2383 case '\017': /* ^O */
2384 if (*(mg->mg_ptr+1) == '\0') {
2385 Safefree(PL_osname);
2388 TAINT_PROPER("assigning to $^O");
2389 PL_osname = savesvpv(sv);
2392 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2394 const char *const start = SvPV(sv, len);
2395 const char *out = (const char*)memchr(start, '\0', len);
2397 struct refcounted_he *tmp_he;
2400 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2402 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2404 /* Opening for input is more common than opening for output, so
2405 ensure that hints for input are sooner on linked list. */
2406 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2407 SVs_TEMP | SvUTF8(sv))
2408 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
2411 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2412 newSVpvs_flags("open>", SVs_TEMP),
2415 /* The UTF-8 setting is carried over */
2416 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2418 PL_compiling.cop_hints_hash
2419 = Perl_refcounted_he_new(aTHX_ tmp_he,
2420 newSVpvs_flags("open<", SVs_TEMP),
2424 case '\020': /* ^P */
2425 if (*remaining == '\0') { /* ^P */
2426 PL_perldb = SvIV(sv);
2427 if (PL_perldb && !PL_DBsingle)
2430 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2432 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2435 case '\024': /* ^T */
2437 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2439 PL_basetime = (Time_t)SvIV(sv);
2442 case '\025': /* ^UTF8CACHE */
2443 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2444 PL_utf8cache = (signed char) sv_2iv(sv);
2447 case '\027': /* ^W & $^WARNING_BITS */
2448 if (*(mg->mg_ptr+1) == '\0') {
2449 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2451 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2452 | (i ? G_WARN_ON : G_WARN_OFF) ;
2455 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2456 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2457 if (!SvPOK(sv) && PL_localizing) {
2458 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2459 PL_compiling.cop_warnings = pWARN_NONE;
2464 int accumulate = 0 ;
2465 int any_fatals = 0 ;
2466 const char * const ptr = SvPV_const(sv, len) ;
2467 for (i = 0 ; i < len ; ++i) {
2468 accumulate |= ptr[i] ;
2469 any_fatals |= (ptr[i] & 0xAA) ;
2472 if (!specialWARN(PL_compiling.cop_warnings))
2473 PerlMemShared_free(PL_compiling.cop_warnings);
2474 PL_compiling.cop_warnings = pWARN_NONE;
2476 /* Yuck. I can't see how to abstract this: */
2477 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2478 WARN_ALL) && !any_fatals) {
2479 if (!specialWARN(PL_compiling.cop_warnings))
2480 PerlMemShared_free(PL_compiling.cop_warnings);
2481 PL_compiling.cop_warnings = pWARN_ALL;
2482 PL_dowarn |= G_WARN_ONCE ;
2486 const char *const p = SvPV_const(sv, len);
2488 PL_compiling.cop_warnings
2489 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2492 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2493 PL_dowarn |= G_WARN_ONCE ;
2501 if (PL_localizing) {
2502 if (PL_localizing == 1)
2503 SAVESPTR(PL_last_in_gv);
2505 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2506 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2509 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2510 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2511 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2514 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2515 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2516 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2519 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2522 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2523 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2524 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2527 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2531 IO * const io = GvIOp(PL_defoutgv);
2534 if ((SvIV(sv)) == 0)
2535 IoFLAGS(io) &= ~IOf_FLUSH;
2537 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2538 PerlIO *ofp = IoOFP(io);
2540 (void)PerlIO_flush(ofp);
2541 IoFLAGS(io) |= IOf_FLUSH;
2547 SvREFCNT_dec(PL_rs);
2548 PL_rs = newSVsv(sv);
2552 SvREFCNT_dec(PL_ors_sv);
2553 if (SvOK(sv) || SvGMAGICAL(sv)) {
2554 PL_ors_sv = newSVsv(sv);
2561 CopARYBASE_set(&PL_compiling, SvIV(sv));
2564 #ifdef COMPLEX_STATUS
2565 if (PL_localizing == 2) {
2566 PL_statusvalue = LvTARGOFF(sv);
2567 PL_statusvalue_vms = LvTARGLEN(sv);
2571 #ifdef VMSISH_STATUS
2573 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2576 STATUS_UNIX_EXIT_SET(SvIV(sv));
2581 # define PERL_VMS_BANG vaxc$errno
2583 # define PERL_VMS_BANG 0
2585 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2586 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2591 if (PL_delaymagic) {
2592 PL_delaymagic |= DM_RUID;
2593 break; /* don't do magic till later */
2596 (void)setruid((Uid_t)PL_uid);
2599 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2601 #ifdef HAS_SETRESUID
2602 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2604 if (PL_uid == PL_euid) { /* special case $< = $> */
2606 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2607 if (PL_uid != 0 && PerlProc_getuid() == 0)
2608 (void)PerlProc_setuid(0);
2610 (void)PerlProc_setuid(PL_uid);
2612 PL_uid = PerlProc_getuid();
2613 Perl_croak(aTHX_ "setruid() not implemented");
2618 PL_uid = PerlProc_getuid();
2619 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2623 if (PL_delaymagic) {
2624 PL_delaymagic |= DM_EUID;
2625 break; /* don't do magic till later */
2628 (void)seteuid((Uid_t)PL_euid);
2631 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2633 #ifdef HAS_SETRESUID
2634 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2636 if (PL_euid == PL_uid) /* special case $> = $< */
2637 PerlProc_setuid(PL_euid);
2639 PL_euid = PerlProc_geteuid();
2640 Perl_croak(aTHX_ "seteuid() not implemented");
2645 PL_euid = PerlProc_geteuid();
2646 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2650 if (PL_delaymagic) {
2651 PL_delaymagic |= DM_RGID;
2652 break; /* don't do magic till later */
2655 (void)setrgid((Gid_t)PL_gid);
2658 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2660 #ifdef HAS_SETRESGID
2661 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2663 if (PL_gid == PL_egid) /* special case $( = $) */
2664 (void)PerlProc_setgid(PL_gid);
2666 PL_gid = PerlProc_getgid();
2667 Perl_croak(aTHX_ "setrgid() not implemented");
2672 PL_gid = PerlProc_getgid();
2673 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2676 #ifdef HAS_SETGROUPS
2678 const char *p = SvPV_const(sv, len);
2679 Groups_t *gary = NULL;
2684 for (i = 0; i < NGROUPS; ++i) {
2685 while (*p && !isSPACE(*p))
2692 Newx(gary, i + 1, Groups_t);
2694 Renew(gary, i + 1, Groups_t);
2698 (void)setgroups(i, gary);
2701 #else /* HAS_SETGROUPS */
2703 #endif /* HAS_SETGROUPS */
2704 if (PL_delaymagic) {
2705 PL_delaymagic |= DM_EGID;
2706 break; /* don't do magic till later */
2709 (void)setegid((Gid_t)PL_egid);
2712 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2714 #ifdef HAS_SETRESGID
2715 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2717 if (PL_egid == PL_gid) /* special case $) = $( */
2718 (void)PerlProc_setgid(PL_egid);
2720 PL_egid = PerlProc_getegid();
2721 Perl_croak(aTHX_ "setegid() not implemented");
2726 PL_egid = PerlProc_getegid();
2727 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2730 PL_chopset = SvPV_force(sv,len);
2733 LOCK_DOLLARZERO_MUTEX;
2734 #ifdef HAS_SETPROCTITLE
2735 /* The BSDs don't show the argv[] in ps(1) output, they
2736 * show a string from the process struct and provide
2737 * the setproctitle() routine to manipulate that. */
2738 if (PL_origalen != 1) {
2739 s = SvPV_const(sv, len);
2740 # if __FreeBSD_version > 410001
2741 /* The leading "-" removes the "perl: " prefix,
2742 * but not the "(perl) suffix from the ps(1)
2743 * output, because that's what ps(1) shows if the
2744 * argv[] is modified. */
2745 setproctitle("-%s", s);
2746 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2747 /* This doesn't really work if you assume that
2748 * $0 = 'foobar'; will wipe out 'perl' from the $0
2749 * because in ps(1) output the result will be like
2750 * sprintf("perl: %s (perl)", s)
2751 * I guess this is a security feature:
2752 * one (a user process) cannot get rid of the original name.
2754 setproctitle("%s", s);
2757 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2758 if (PL_origalen != 1) {
2760 s = SvPV_const(sv, len);
2761 un.pst_command = (char *)s;
2762 pstat(PSTAT_SETCMD, un, len, 0, 0);
2765 if (PL_origalen > 1) {
2766 /* PL_origalen is set in perl_parse(). */
2767 s = SvPV_force(sv,len);
2768 if (len >= (STRLEN)PL_origalen-1) {
2769 /* Longer than original, will be truncated. We assume that
2770 * PL_origalen bytes are available. */
2771 Copy(s, PL_origargv[0], PL_origalen-1, char);
2774 /* Shorter than original, will be padded. */
2776 /* Special case for Mac OS X: see [perl #38868] */
2779 /* Is the space counterintuitive? Yes.
2780 * (You were expecting \0?)
2781 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2783 const int pad = ' ';
2785 Copy(s, PL_origargv[0], len, char);
2786 PL_origargv[0][len] = 0;
2787 memset(PL_origargv[0] + len + 1,
2788 pad, PL_origalen - len - 1);
2790 PL_origargv[0][PL_origalen-1] = 0;
2791 for (i = 1; i < PL_origargc; i++)
2795 UNLOCK_DOLLARZERO_MUTEX;
2802 Perl_whichsig(pTHX_ const char *sig)
2804 register char* const* sigv;
2806 PERL_ARGS_ASSERT_WHICHSIG;
2807 PERL_UNUSED_CONTEXT;
2809 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2810 if (strEQ(sig,*sigv))
2811 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2813 if (strEQ(sig,"CHLD"))
2817 if (strEQ(sig,"CLD"))
2824 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2825 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2827 Perl_sighandler(int sig)
2830 #ifdef PERL_GET_SIG_CONTEXT
2831 dTHXa(PERL_GET_SIG_CONTEXT);
2838 SV * const tSv = PL_Sv;
2842 XPV * const tXpv = PL_Xpv;
2844 if (PL_savestack_ix + 15 <= PL_savestack_max)
2846 if (PL_markstack_ptr < PL_markstack_max - 2)
2848 if (PL_scopestack_ix < PL_scopestack_max - 3)
2851 if (!PL_psig_ptr[sig]) {
2852 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2857 /* Max number of items pushed there is 3*n or 4. We cannot fix
2858 infinity, so we fix 4 (in fact 5): */
2860 PL_savestack_ix += 5; /* Protect save in progress. */
2861 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2864 PL_markstack_ptr++; /* Protect mark. */
2866 PL_scopestack_ix += 1;
2867 /* sv_2cv is too complicated, try a simpler variant first: */
2868 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2869 || SvTYPE(cv) != SVt_PVCV) {
2871 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2874 if (!cv || !CvROOT(cv)) {
2875 if (ckWARN(WARN_SIGNAL))
2876 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2877 PL_sig_name[sig], (gv ? GvENAME(gv)
2884 if(PL_psig_name[sig]) {
2885 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2887 #if !defined(PERL_IMPLICIT_CONTEXT)
2891 sv = sv_newmortal();
2892 sv_setpv(sv,PL_sig_name[sig]);
2895 PUSHSTACKi(PERLSI_SIGNAL);
2898 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2900 struct sigaction oact;
2902 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2905 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2906 /* The siginfo fields signo, code, errno, pid, uid,
2907 * addr, status, and band are defined by POSIX/SUSv3. */
2908 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2909 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2910 #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. */
2911 hv_stores(sih, "errno", newSViv(sip->si_errno));
2912 hv_stores(sih, "status", newSViv(sip->si_status));
2913 hv_stores(sih, "uid", newSViv(sip->si_uid));
2914 hv_stores(sih, "pid", newSViv(sip->si_pid));
2915 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2916 hv_stores(sih, "band", newSViv(sip->si_band));
2920 mPUSHp((char *)sip, sizeof(*sip));
2928 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2931 if (SvTRUE(ERRSV)) {
2933 #ifdef HAS_SIGPROCMASK
2934 /* Handler "died", for example to get out of a restart-able read().
2935 * Before we re-do that on its behalf re-enable the signal which was
2936 * blocked by the system when we entered.
2940 sigaddset(&set,sig);
2941 sigprocmask(SIG_UNBLOCK, &set, NULL);
2943 /* Not clear if this will work */
2944 (void)rsignal(sig, SIG_IGN);
2945 (void)rsignal(sig, PL_csighandlerp);
2947 #endif /* !PERL_MICRO */
2948 Perl_die(aTHX_ NULL);
2952 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2956 PL_scopestack_ix -= 1;
2959 PL_op = myop; /* Apparently not needed... */
2961 PL_Sv = tSv; /* Restore global temporaries. */
2968 S_restore_magic(pTHX_ const void *p)
2971 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2972 SV* const sv = mgs->mgs_sv;
2977 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2979 #ifdef PERL_OLD_COPY_ON_WRITE
2980 /* While magic was saved (and off) sv_setsv may well have seen
2981 this SV as a prime candidate for COW. */
2983 sv_force_normal_flags(sv, 0);
2987 SvFLAGS(sv) |= mgs->mgs_flags;
2990 if (SvGMAGICAL(sv)) {
2991 /* downgrade public flags to private,
2992 and discard any other private flags */
2994 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2996 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2997 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3002 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3004 /* If we're still on top of the stack, pop us off. (That condition
3005 * will be satisfied if restore_magic was called explicitly, but *not*
3006 * if it's being called via leave_scope.)
3007 * The reason for doing this is that otherwise, things like sv_2cv()
3008 * may leave alloc gunk on the savestack, and some code
3009 * (e.g. sighandler) doesn't expect that...
3011 if (PL_savestack_ix == mgs->mgs_ss_ix)
3013 I32 popval = SSPOPINT;
3014 assert(popval == SAVEt_DESTRUCTOR_X);
3015 PL_savestack_ix -= 2;
3017 assert(popval == SAVEt_ALLOC);
3019 PL_savestack_ix -= popval;
3025 S_unwind_handler_stack(pTHX_ const void *p)
3028 const U32 flags = *(const U32*)p;
3030 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3033 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3034 #if !defined(PERL_IMPLICIT_CONTEXT)
3036 SvREFCNT_dec(PL_sig_sv);
3041 =for apidoc magic_sethint
3043 Triggered by a store to %^H, records the key/value pair to
3044 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3045 anything that would need a deep copy. Maybe we should warn if we find a
3051 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3054 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3055 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3057 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3059 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3060 an alternative leaf in there, with PL_compiling.cop_hints being used if
3061 it's NULL. If needed for threads, the alternative could lock a mutex,
3062 or take other more complex action. */
3064 /* Something changed in %^H, so it will need to be restored on scope exit.
3065 Doing this here saves a lot of doing it manually in perl code (and
3066 forgetting to do it, and consequent subtle errors. */
3067 PL_hints |= HINT_LOCALIZE_HH;
3068 PL_compiling.cop_hints_hash
3069 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3074 =for apidoc magic_clearhint
3076 Triggered by a delete from %^H, records the key to
3077 C<PL_compiling.cop_hints_hash>.
3082 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3086 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3087 PERL_UNUSED_ARG(sv);
3089 assert(mg->mg_len == HEf_SVKEY);
3091 PERL_UNUSED_ARG(sv);
3093 PL_hints |= HINT_LOCALIZE_HH;
3094 PL_compiling.cop_hints_hash
3095 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3096 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3102 * c-indentation-style: bsd
3104 * indent-tabs-mode: t
3107 * ex: set ts=8 sts=4 sw=4 noet: