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 int i = (I16)mg->mg_private;
1242 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1245 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1250 sv_setsv(sv,PL_psig_ptr[i]);
1252 Sighandler_t sigstate = rsignal_state(i);
1253 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1254 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1257 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1258 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1261 /* cache state so we don't fetch it again */
1262 if(sigstate == (Sighandler_t) SIG_IGN)
1263 sv_setpvs(sv,"IGNORE");
1265 sv_setsv(sv,&PL_sv_undef);
1266 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1273 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1275 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1276 PERL_UNUSED_ARG(sv);
1278 magic_setsig(NULL, mg);
1279 return sv_unmagic(sv, mg->mg_type);
1283 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1284 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1286 Perl_csighandler(int sig)
1289 #ifdef PERL_GET_SIG_CONTEXT
1290 dTHXa(PERL_GET_SIG_CONTEXT);
1294 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1295 (void) rsignal(sig, PL_csighandlerp);
1296 if (PL_sig_ignoring[sig]) return;
1298 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1299 if (PL_sig_defaulting[sig])
1300 #ifdef KILL_BY_SIGPRC
1301 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1316 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1317 /* Call the perl level handler now--
1318 * with risk we may be in malloc() etc. */
1319 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1320 (*PL_sighandlerp)(sig, NULL, NULL);
1322 (*PL_sighandlerp)(sig);
1325 /* Set a flag to say this signal is pending, that is awaiting delivery after
1326 * the current Perl opcode completes */
1327 PL_psig_pend[sig]++;
1329 #ifndef SIG_PENDING_DIE_COUNT
1330 # define SIG_PENDING_DIE_COUNT 120
1332 /* And one to say _a_ signal is pending */
1333 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1334 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1335 (unsigned long)SIG_PENDING_DIE_COUNT);
1339 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1341 Perl_csighandler_init(void)
1344 if (PL_sig_handlers_initted) return;
1346 for (sig = 1; sig < SIG_SIZE; sig++) {
1347 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1349 PL_sig_defaulting[sig] = 1;
1350 (void) rsignal(sig, PL_csighandlerp);
1352 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1353 PL_sig_ignoring[sig] = 0;
1356 PL_sig_handlers_initted = 1;
1361 Perl_despatch_signals(pTHX)
1366 for (sig = 1; sig < SIG_SIZE; sig++) {
1367 if (PL_psig_pend[sig]) {
1368 PERL_BLOCKSIG_ADD(set, sig);
1369 PL_psig_pend[sig] = 0;
1370 PERL_BLOCKSIG_BLOCK(set);
1371 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1372 (*PL_sighandlerp)(sig, NULL, NULL);
1374 (*PL_sighandlerp)(sig);
1376 PERL_BLOCKSIG_UNBLOCK(set);
1381 /* sv of NULL signifies that we're acting as magic_clearsig. */
1383 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1388 /* Need to be careful with SvREFCNT_dec(), because that can have side
1389 * effects (due to closures). We must make sure that the new disposition
1390 * is in place before it is called.
1394 #ifdef HAS_SIGPROCMASK
1398 register const char *s = MgPV_const(mg,len);
1400 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1403 if (strEQ(s,"__DIE__"))
1405 else if (strEQ(s,"__WARN__")
1406 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1407 /* Merge the existing behaviours, which are as follows:
1408 magic_setsig, we always set svp to &PL_warnhook
1409 (hence we always change the warnings handler)
1410 For magic_clearsig, we don't change the warnings handler if it's
1411 set to the &PL_warnhook. */
1414 Perl_croak(aTHX_ "No such hook: %s", s);
1417 if (*svp != PERL_WARNHOOK_FATAL)
1423 i = (I16)mg->mg_private;
1425 mg->mg_private = i = whichsig(s); /* ...no, a brick */
1428 if (sv && ckWARN(WARN_SIGNAL))
1429 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1432 #ifdef HAS_SIGPROCMASK
1433 /* Avoid having the signal arrive at a bad time, if possible. */
1436 sigprocmask(SIG_BLOCK, &set, &save);
1438 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1439 SAVEFREESV(save_sv);
1440 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1443 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1444 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1446 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1447 PL_sig_ignoring[i] = 0;
1449 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1450 PL_sig_defaulting[i] = 0;
1452 to_dec = PL_psig_ptr[i];
1454 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1455 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1457 /* Signals don't change name during the program's execution, so once
1458 they're cached in the appropriate slot of PL_psig_name, they can
1461 Ideally we'd find some way of making SVs at (C) compile time, or
1462 at least, doing most of the work. */
1463 if (!PL_psig_name[i]) {
1464 PL_psig_name[i] = newSVpvn(s, len);
1465 SvREADONLY_on(PL_psig_name[i]);
1468 SvREFCNT_dec(PL_psig_name[i]);
1469 PL_psig_name[i] = NULL;
1470 PL_psig_ptr[i] = NULL;
1473 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1475 (void)rsignal(i, PL_csighandlerp);
1478 *svp = SvREFCNT_inc_simple_NN(sv);
1480 if (sv && SvOK(sv)) {
1481 s = SvPV_force(sv, len);
1485 if (sv && strEQ(s,"IGNORE")) {
1487 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1488 PL_sig_ignoring[i] = 1;
1489 (void)rsignal(i, PL_csighandlerp);
1491 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1495 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1497 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1498 PL_sig_defaulting[i] = 1;
1499 (void)rsignal(i, PL_csighandlerp);
1501 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1507 * We should warn if HINT_STRICT_REFS, but without
1508 * access to a known hint bit in a known OP, we can't
1509 * tell whether HINT_STRICT_REFS is in force or not.
1511 if (!strchr(s,':') && !strchr(s,'\''))
1512 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1515 (void)rsignal(i, PL_csighandlerp);
1517 *svp = SvREFCNT_inc_simple_NN(sv);
1521 #ifdef HAS_SIGPROCMASK
1526 SvREFCNT_dec(to_dec);
1529 #endif /* !PERL_MICRO */
1532 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1535 PERL_ARGS_ASSERT_MAGIC_SETISA;
1536 PERL_UNUSED_ARG(sv);
1538 /* Skip _isaelem because _isa will handle it shortly */
1539 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1542 return magic_clearisa(NULL, mg);
1545 /* sv of NULL signifies that we're acting as magic_setisa. */
1547 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1552 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1554 /* Bail out if destruction is going on */
1555 if(PL_dirty) return 0;
1558 av_clear(MUTABLE_AV(sv));
1560 /* XXX Once it's possible, we need to
1561 detect that our @ISA is aliased in
1562 other stashes, and act on the stashes
1563 of all of the aliases */
1565 /* The first case occurs via setisa,
1566 the second via setisa_elem, which
1567 calls this same magic */
1569 SvTYPE(mg->mg_obj) == SVt_PVGV
1570 ? (const GV *)mg->mg_obj
1571 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1575 mro_isa_changed_in(stash);
1581 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1584 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1585 PERL_UNUSED_ARG(sv);
1586 PERL_UNUSED_ARG(mg);
1587 PL_amagic_generation++;
1593 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1595 HV * const hv = MUTABLE_HV(LvTARG(sv));
1598 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1599 PERL_UNUSED_ARG(mg);
1602 (void) hv_iterinit(hv);
1603 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1606 while (hv_iternext(hv))
1611 sv_setiv(sv, (IV)i);
1616 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1618 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1619 PERL_UNUSED_ARG(mg);
1621 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1626 /* caller is responsible for stack switching/cleanup */
1628 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1633 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1637 PUSHs(SvTIED_obj(sv, mg));
1640 if (mg->mg_len >= 0)
1641 mPUSHp(mg->mg_ptr, mg->mg_len);
1642 else if (mg->mg_len == HEf_SVKEY)
1643 PUSHs(MUTABLE_SV(mg->mg_ptr));
1645 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1654 return call_method(meth, flags);
1658 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1662 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1666 PUSHSTACKi(PERLSI_MAGIC);
1668 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1669 sv_setsv(sv, *PL_stack_sp--);
1679 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1681 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1684 mg->mg_flags |= MGf_GSKIP;
1685 magic_methpack(sv,mg,"FETCH");
1690 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1694 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1697 PUSHSTACKi(PERLSI_MAGIC);
1698 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1705 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1707 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1709 return magic_methpack(sv,mg,"DELETE");
1714 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1719 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1723 PUSHSTACKi(PERLSI_MAGIC);
1724 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1725 sv = *PL_stack_sp--;
1726 retval = SvIV(sv)-1;
1728 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1733 return (U32) retval;
1737 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1741 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1744 PUSHSTACKi(PERLSI_MAGIC);
1746 XPUSHs(SvTIED_obj(sv, mg));
1748 call_method("CLEAR", G_SCALAR|G_DISCARD);
1756 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1759 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1761 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1765 PUSHSTACKi(PERLSI_MAGIC);
1768 PUSHs(SvTIED_obj(sv, mg));
1773 if (call_method(meth, G_SCALAR))
1774 sv_setsv(key, *PL_stack_sp--);
1783 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1785 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1787 return magic_methpack(sv,mg,"EXISTS");
1791 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1795 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1796 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1798 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1800 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1802 if (HvEITER_get(hv))
1803 /* we are in an iteration so the hash cannot be empty */
1805 /* no xhv_eiter so now use FIRSTKEY */
1806 key = sv_newmortal();
1807 magic_nextpack(MUTABLE_SV(hv), mg, key);
1808 HvEITER_set(hv, NULL); /* need to reset iterator */
1809 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1812 /* there is a SCALAR method that we can call */
1814 PUSHSTACKi(PERLSI_MAGIC);
1820 if (call_method("SCALAR", G_SCALAR))
1821 retval = *PL_stack_sp--;
1823 retval = &PL_sv_undef;
1830 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1833 GV * const gv = PL_DBline;
1834 const I32 i = SvTRUE(sv);
1835 SV ** const svp = av_fetch(GvAV(gv),
1836 atoi(MgPV_nolen_const(mg)), FALSE);
1838 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1840 if (svp && SvIOKp(*svp)) {
1841 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1843 /* set or clear breakpoint in the relevant control op */
1845 o->op_flags |= OPf_SPECIAL;
1847 o->op_flags &= ~OPf_SPECIAL;
1854 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1857 AV * const obj = MUTABLE_AV(mg->mg_obj);
1859 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1862 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1870 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1873 AV * const obj = MUTABLE_AV(mg->mg_obj);
1875 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1878 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1880 if (ckWARN(WARN_MISC))
1881 Perl_warner(aTHX_ packWARN(WARN_MISC),
1882 "Attempt to set length of freed array");
1888 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1892 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1893 PERL_UNUSED_ARG(sv);
1895 /* during global destruction, mg_obj may already have been freed */
1896 if (PL_in_clean_all)
1899 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1902 /* arylen scalar holds a pointer back to the array, but doesn't own a
1903 reference. Hence the we (the array) are about to go away with it
1904 still pointing at us. Clear its pointer, else it would be pointing
1905 at free memory. See the comment in sv_magic about reference loops,
1906 and why it can't own a reference to us. */
1913 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1916 SV* const lsv = LvTARG(sv);
1918 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1919 PERL_UNUSED_ARG(mg);
1921 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1922 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1923 if (found && found->mg_len >= 0) {
1924 I32 i = found->mg_len;
1926 sv_pos_b2u(lsv, &i);
1927 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1936 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1939 SV* const lsv = LvTARG(sv);
1945 PERL_ARGS_ASSERT_MAGIC_SETPOS;
1946 PERL_UNUSED_ARG(mg);
1948 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1949 found = mg_find(lsv, PERL_MAGIC_regex_global);
1955 #ifdef PERL_OLD_COPY_ON_WRITE
1957 sv_force_normal_flags(lsv, 0);
1959 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
1962 else if (!SvOK(sv)) {
1966 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1968 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
1971 ulen = sv_len_utf8(lsv);
1981 else if (pos > (SSize_t)len)
1986 sv_pos_u2b(lsv, &p, 0);
1990 found->mg_len = pos;
1991 found->mg_flags &= ~MGf_MINMATCH;
1997 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2000 SV * const lsv = LvTARG(sv);
2001 const char * const tmps = SvPV_const(lsv,len);
2002 I32 offs = LvTARGOFF(sv);
2003 I32 rem = LvTARGLEN(sv);
2005 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2006 PERL_UNUSED_ARG(mg);
2009 sv_pos_u2b(lsv, &offs, &rem);
2010 if (offs > (I32)len)
2012 if (rem + offs > (I32)len)
2014 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2021 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2025 const char * const tmps = SvPV_const(sv, len);
2026 SV * const lsv = LvTARG(sv);
2027 I32 lvoff = LvTARGOFF(sv);
2028 I32 lvlen = LvTARGLEN(sv);
2030 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2031 PERL_UNUSED_ARG(mg);
2034 sv_utf8_upgrade(lsv);
2035 sv_pos_u2b(lsv, &lvoff, &lvlen);
2036 sv_insert(lsv, lvoff, lvlen, tmps, len);
2037 LvTARGLEN(sv) = sv_len_utf8(sv);
2040 else if (lsv && SvUTF8(lsv)) {
2042 sv_pos_u2b(lsv, &lvoff, &lvlen);
2043 LvTARGLEN(sv) = len;
2044 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2045 sv_insert(lsv, lvoff, lvlen, utf8, len);
2049 sv_insert(lsv, lvoff, lvlen, tmps, len);
2050 LvTARGLEN(sv) = len;
2058 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2062 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2063 PERL_UNUSED_ARG(sv);
2065 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2070 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2074 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2075 PERL_UNUSED_ARG(sv);
2077 /* update taint status */
2086 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2088 SV * const lsv = LvTARG(sv);
2090 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2091 PERL_UNUSED_ARG(mg);
2094 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2102 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2104 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2105 PERL_UNUSED_ARG(mg);
2106 do_vecset(sv); /* XXX slurp this routine */
2111 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2116 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2118 if (LvTARGLEN(sv)) {
2120 SV * const ahv = LvTARG(sv);
2121 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2126 AV *const av = MUTABLE_AV(LvTARG(sv));
2127 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2128 targ = AvARRAY(av)[LvTARGOFF(sv)];
2130 if (targ && (targ != &PL_sv_undef)) {
2131 /* somebody else defined it for us */
2132 SvREFCNT_dec(LvTARG(sv));
2133 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2135 SvREFCNT_dec(mg->mg_obj);
2137 mg->mg_flags &= ~MGf_REFCOUNTED;
2142 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2147 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2149 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2150 PERL_UNUSED_ARG(mg);
2154 sv_setsv(LvTARG(sv), sv);
2155 SvSETMAGIC(LvTARG(sv));
2161 Perl_vivify_defelem(pTHX_ SV *sv)
2167 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2169 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2172 SV * const ahv = LvTARG(sv);
2173 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2176 if (!value || value == &PL_sv_undef)
2177 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2180 AV *const av = MUTABLE_AV(LvTARG(sv));
2181 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2182 LvTARG(sv) = NULL; /* array can't be extended */
2184 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2185 if (!svp || (value = *svp) == &PL_sv_undef)
2186 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2189 SvREFCNT_inc_simple_void(value);
2190 SvREFCNT_dec(LvTARG(sv));
2193 SvREFCNT_dec(mg->mg_obj);
2195 mg->mg_flags &= ~MGf_REFCOUNTED;
2199 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2201 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2202 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2206 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2208 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2209 PERL_UNUSED_CONTEXT;
2216 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2218 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2220 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2222 if (uf && uf->uf_set)
2223 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2228 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2230 const char type = mg->mg_type;
2232 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2234 if (type == PERL_MAGIC_qr) {
2235 } else if (type == PERL_MAGIC_bm) {
2239 assert(type == PERL_MAGIC_fm);
2242 return sv_unmagic(sv, type);
2245 #ifdef USE_LOCALE_COLLATE
2247 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2249 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2252 * RenE<eacute> Descartes said "I think not."
2253 * and vanished with a faint plop.
2255 PERL_UNUSED_CONTEXT;
2256 PERL_UNUSED_ARG(sv);
2258 Safefree(mg->mg_ptr);
2264 #endif /* USE_LOCALE_COLLATE */
2266 /* Just clear the UTF-8 cache data. */
2268 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2270 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2271 PERL_UNUSED_CONTEXT;
2272 PERL_UNUSED_ARG(sv);
2273 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2275 mg->mg_len = -1; /* The mg_len holds the len cache. */
2280 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2283 register const char *s;
2285 register const REGEXP * rx;
2286 const char * const remaining = mg->mg_ptr + 1;
2290 PERL_ARGS_ASSERT_MAGIC_SET;
2292 switch (*mg->mg_ptr) {
2293 case '\015': /* $^MATCH */
2294 if (strEQ(remaining, "ATCH"))
2296 case '`': /* ${^PREMATCH} caught below */
2298 paren = RX_BUFF_IDX_PREMATCH;
2300 case '\'': /* ${^POSTMATCH} caught below */
2302 paren = RX_BUFF_IDX_POSTMATCH;
2306 paren = RX_BUFF_IDX_FULLMATCH;
2308 case '1': case '2': case '3': case '4':
2309 case '5': case '6': case '7': case '8': case '9':
2310 paren = atoi(mg->mg_ptr);
2312 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2313 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2316 /* Croak with a READONLY error when a numbered match var is
2317 * set without a previous pattern match. Unless it's C<local $1>
2319 if (!PL_localizing) {
2320 Perl_croak(aTHX_ "%s", PL_no_modify);
2323 case '\001': /* ^A */
2324 sv_setsv(PL_bodytarget, sv);
2326 case '\003': /* ^C */
2327 PL_minus_c = (bool)SvIV(sv);
2330 case '\004': /* ^D */
2332 s = SvPV_nolen_const(sv);
2333 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2334 DEBUG_x(dump_all());
2336 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2339 case '\005': /* ^E */
2340 if (*(mg->mg_ptr+1) == '\0') {
2342 set_vaxc_errno(SvIV(sv));
2345 SetLastError( SvIV(sv) );
2348 os2_setsyserrno(SvIV(sv));
2350 /* will anyone ever use this? */
2351 SETERRNO(SvIV(sv), 4);
2356 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2358 SvREFCNT_dec(PL_encoding);
2359 if (SvOK(sv) || SvGMAGICAL(sv)) {
2360 PL_encoding = newSVsv(sv);
2367 case '\006': /* ^F */
2368 PL_maxsysfd = SvIV(sv);
2370 case '\010': /* ^H */
2371 PL_hints = SvIV(sv);
2373 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2374 Safefree(PL_inplace);
2375 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2377 case '\017': /* ^O */
2378 if (*(mg->mg_ptr+1) == '\0') {
2379 Safefree(PL_osname);
2382 TAINT_PROPER("assigning to $^O");
2383 PL_osname = savesvpv(sv);
2386 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2388 const char *const start = SvPV(sv, len);
2389 const char *out = (const char*)memchr(start, '\0', len);
2391 struct refcounted_he *tmp_he;
2394 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2396 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2398 /* Opening for input is more common than opening for output, so
2399 ensure that hints for input are sooner on linked list. */
2400 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2401 SVs_TEMP | SvUTF8(sv))
2402 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
2405 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2406 newSVpvs_flags("open>", SVs_TEMP),
2409 /* The UTF-8 setting is carried over */
2410 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2412 PL_compiling.cop_hints_hash
2413 = Perl_refcounted_he_new(aTHX_ tmp_he,
2414 newSVpvs_flags("open<", SVs_TEMP),
2418 case '\020': /* ^P */
2419 if (*remaining == '\0') { /* ^P */
2420 PL_perldb = SvIV(sv);
2421 if (PL_perldb && !PL_DBsingle)
2424 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2426 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2429 case '\024': /* ^T */
2431 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2433 PL_basetime = (Time_t)SvIV(sv);
2436 case '\025': /* ^UTF8CACHE */
2437 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2438 PL_utf8cache = (signed char) sv_2iv(sv);
2441 case '\027': /* ^W & $^WARNING_BITS */
2442 if (*(mg->mg_ptr+1) == '\0') {
2443 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2445 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2446 | (i ? G_WARN_ON : G_WARN_OFF) ;
2449 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2450 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2451 if (!SvPOK(sv) && PL_localizing) {
2452 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2453 PL_compiling.cop_warnings = pWARN_NONE;
2458 int accumulate = 0 ;
2459 int any_fatals = 0 ;
2460 const char * const ptr = SvPV_const(sv, len) ;
2461 for (i = 0 ; i < len ; ++i) {
2462 accumulate |= ptr[i] ;
2463 any_fatals |= (ptr[i] & 0xAA) ;
2466 if (!specialWARN(PL_compiling.cop_warnings))
2467 PerlMemShared_free(PL_compiling.cop_warnings);
2468 PL_compiling.cop_warnings = pWARN_NONE;
2470 /* Yuck. I can't see how to abstract this: */
2471 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2472 WARN_ALL) && !any_fatals) {
2473 if (!specialWARN(PL_compiling.cop_warnings))
2474 PerlMemShared_free(PL_compiling.cop_warnings);
2475 PL_compiling.cop_warnings = pWARN_ALL;
2476 PL_dowarn |= G_WARN_ONCE ;
2480 const char *const p = SvPV_const(sv, len);
2482 PL_compiling.cop_warnings
2483 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2486 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2487 PL_dowarn |= G_WARN_ONCE ;
2495 if (PL_localizing) {
2496 if (PL_localizing == 1)
2497 SAVESPTR(PL_last_in_gv);
2499 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2500 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2503 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2504 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2505 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2508 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2509 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2510 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2513 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2516 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2517 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2518 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2521 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2525 IO * const io = GvIOp(PL_defoutgv);
2528 if ((SvIV(sv)) == 0)
2529 IoFLAGS(io) &= ~IOf_FLUSH;
2531 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2532 PerlIO *ofp = IoOFP(io);
2534 (void)PerlIO_flush(ofp);
2535 IoFLAGS(io) |= IOf_FLUSH;
2541 SvREFCNT_dec(PL_rs);
2542 PL_rs = newSVsv(sv);
2546 SvREFCNT_dec(PL_ors_sv);
2547 if (SvOK(sv) || SvGMAGICAL(sv)) {
2548 PL_ors_sv = newSVsv(sv);
2555 CopARYBASE_set(&PL_compiling, SvIV(sv));
2558 #ifdef COMPLEX_STATUS
2559 if (PL_localizing == 2) {
2560 PL_statusvalue = LvTARGOFF(sv);
2561 PL_statusvalue_vms = LvTARGLEN(sv);
2565 #ifdef VMSISH_STATUS
2567 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2570 STATUS_UNIX_EXIT_SET(SvIV(sv));
2575 # define PERL_VMS_BANG vaxc$errno
2577 # define PERL_VMS_BANG 0
2579 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2580 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2585 if (PL_delaymagic) {
2586 PL_delaymagic |= DM_RUID;
2587 break; /* don't do magic till later */
2590 (void)setruid((Uid_t)PL_uid);
2593 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2595 #ifdef HAS_SETRESUID
2596 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2598 if (PL_uid == PL_euid) { /* special case $< = $> */
2600 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2601 if (PL_uid != 0 && PerlProc_getuid() == 0)
2602 (void)PerlProc_setuid(0);
2604 (void)PerlProc_setuid(PL_uid);
2606 PL_uid = PerlProc_getuid();
2607 Perl_croak(aTHX_ "setruid() not implemented");
2612 PL_uid = PerlProc_getuid();
2613 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2617 if (PL_delaymagic) {
2618 PL_delaymagic |= DM_EUID;
2619 break; /* don't do magic till later */
2622 (void)seteuid((Uid_t)PL_euid);
2625 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2627 #ifdef HAS_SETRESUID
2628 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2630 if (PL_euid == PL_uid) /* special case $> = $< */
2631 PerlProc_setuid(PL_euid);
2633 PL_euid = PerlProc_geteuid();
2634 Perl_croak(aTHX_ "seteuid() not implemented");
2639 PL_euid = PerlProc_geteuid();
2640 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2644 if (PL_delaymagic) {
2645 PL_delaymagic |= DM_RGID;
2646 break; /* don't do magic till later */
2649 (void)setrgid((Gid_t)PL_gid);
2652 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2654 #ifdef HAS_SETRESGID
2655 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2657 if (PL_gid == PL_egid) /* special case $( = $) */
2658 (void)PerlProc_setgid(PL_gid);
2660 PL_gid = PerlProc_getgid();
2661 Perl_croak(aTHX_ "setrgid() not implemented");
2666 PL_gid = PerlProc_getgid();
2667 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2670 #ifdef HAS_SETGROUPS
2672 const char *p = SvPV_const(sv, len);
2673 Groups_t *gary = NULL;
2678 for (i = 0; i < NGROUPS; ++i) {
2679 while (*p && !isSPACE(*p))
2686 Newx(gary, i + 1, Groups_t);
2688 Renew(gary, i + 1, Groups_t);
2692 (void)setgroups(i, gary);
2695 #else /* HAS_SETGROUPS */
2697 #endif /* HAS_SETGROUPS */
2698 if (PL_delaymagic) {
2699 PL_delaymagic |= DM_EGID;
2700 break; /* don't do magic till later */
2703 (void)setegid((Gid_t)PL_egid);
2706 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2708 #ifdef HAS_SETRESGID
2709 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2711 if (PL_egid == PL_gid) /* special case $) = $( */
2712 (void)PerlProc_setgid(PL_egid);
2714 PL_egid = PerlProc_getegid();
2715 Perl_croak(aTHX_ "setegid() not implemented");
2720 PL_egid = PerlProc_getegid();
2721 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2724 PL_chopset = SvPV_force(sv,len);
2727 LOCK_DOLLARZERO_MUTEX;
2728 #ifdef HAS_SETPROCTITLE
2729 /* The BSDs don't show the argv[] in ps(1) output, they
2730 * show a string from the process struct and provide
2731 * the setproctitle() routine to manipulate that. */
2732 if (PL_origalen != 1) {
2733 s = SvPV_const(sv, len);
2734 # if __FreeBSD_version > 410001
2735 /* The leading "-" removes the "perl: " prefix,
2736 * but not the "(perl) suffix from the ps(1)
2737 * output, because that's what ps(1) shows if the
2738 * argv[] is modified. */
2739 setproctitle("-%s", s);
2740 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2741 /* This doesn't really work if you assume that
2742 * $0 = 'foobar'; will wipe out 'perl' from the $0
2743 * because in ps(1) output the result will be like
2744 * sprintf("perl: %s (perl)", s)
2745 * I guess this is a security feature:
2746 * one (a user process) cannot get rid of the original name.
2748 setproctitle("%s", s);
2751 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2752 if (PL_origalen != 1) {
2754 s = SvPV_const(sv, len);
2755 un.pst_command = (char *)s;
2756 pstat(PSTAT_SETCMD, un, len, 0, 0);
2759 if (PL_origalen > 1) {
2760 /* PL_origalen is set in perl_parse(). */
2761 s = SvPV_force(sv,len);
2762 if (len >= (STRLEN)PL_origalen-1) {
2763 /* Longer than original, will be truncated. We assume that
2764 * PL_origalen bytes are available. */
2765 Copy(s, PL_origargv[0], PL_origalen-1, char);
2768 /* Shorter than original, will be padded. */
2770 /* Special case for Mac OS X: see [perl #38868] */
2773 /* Is the space counterintuitive? Yes.
2774 * (You were expecting \0?)
2775 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2777 const int pad = ' ';
2779 Copy(s, PL_origargv[0], len, char);
2780 PL_origargv[0][len] = 0;
2781 memset(PL_origargv[0] + len + 1,
2782 pad, PL_origalen - len - 1);
2784 PL_origargv[0][PL_origalen-1] = 0;
2785 for (i = 1; i < PL_origargc; i++)
2789 UNLOCK_DOLLARZERO_MUTEX;
2796 Perl_whichsig(pTHX_ const char *sig)
2798 register char* const* sigv;
2800 PERL_ARGS_ASSERT_WHICHSIG;
2801 PERL_UNUSED_CONTEXT;
2803 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2804 if (strEQ(sig,*sigv))
2805 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2807 if (strEQ(sig,"CHLD"))
2811 if (strEQ(sig,"CLD"))
2818 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2819 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2821 Perl_sighandler(int sig)
2824 #ifdef PERL_GET_SIG_CONTEXT
2825 dTHXa(PERL_GET_SIG_CONTEXT);
2832 SV * const tSv = PL_Sv;
2836 XPV * const tXpv = PL_Xpv;
2838 if (PL_savestack_ix + 15 <= PL_savestack_max)
2840 if (PL_markstack_ptr < PL_markstack_max - 2)
2842 if (PL_scopestack_ix < PL_scopestack_max - 3)
2845 if (!PL_psig_ptr[sig]) {
2846 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2851 /* Max number of items pushed there is 3*n or 4. We cannot fix
2852 infinity, so we fix 4 (in fact 5): */
2854 PL_savestack_ix += 5; /* Protect save in progress. */
2855 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2858 PL_markstack_ptr++; /* Protect mark. */
2860 PL_scopestack_ix += 1;
2861 /* sv_2cv is too complicated, try a simpler variant first: */
2862 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2863 || SvTYPE(cv) != SVt_PVCV) {
2865 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2868 if (!cv || !CvROOT(cv)) {
2869 if (ckWARN(WARN_SIGNAL))
2870 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2871 PL_sig_name[sig], (gv ? GvENAME(gv)
2878 if(PL_psig_name[sig]) {
2879 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2881 #if !defined(PERL_IMPLICIT_CONTEXT)
2885 sv = sv_newmortal();
2886 sv_setpv(sv,PL_sig_name[sig]);
2889 PUSHSTACKi(PERLSI_SIGNAL);
2892 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2894 struct sigaction oact;
2896 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2899 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2900 /* The siginfo fields signo, code, errno, pid, uid,
2901 * addr, status, and band are defined by POSIX/SUSv3. */
2902 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2903 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2904 #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. */
2905 hv_stores(sih, "errno", newSViv(sip->si_errno));
2906 hv_stores(sih, "status", newSViv(sip->si_status));
2907 hv_stores(sih, "uid", newSViv(sip->si_uid));
2908 hv_stores(sih, "pid", newSViv(sip->si_pid));
2909 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2910 hv_stores(sih, "band", newSViv(sip->si_band));
2914 mPUSHp((char *)sip, sizeof(*sip));
2922 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2925 if (SvTRUE(ERRSV)) {
2927 #ifdef HAS_SIGPROCMASK
2928 /* Handler "died", for example to get out of a restart-able read().
2929 * Before we re-do that on its behalf re-enable the signal which was
2930 * blocked by the system when we entered.
2934 sigaddset(&set,sig);
2935 sigprocmask(SIG_UNBLOCK, &set, NULL);
2937 /* Not clear if this will work */
2938 (void)rsignal(sig, SIG_IGN);
2939 (void)rsignal(sig, PL_csighandlerp);
2941 #endif /* !PERL_MICRO */
2942 Perl_die(aTHX_ NULL);
2946 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2950 PL_scopestack_ix -= 1;
2953 PL_op = myop; /* Apparently not needed... */
2955 PL_Sv = tSv; /* Restore global temporaries. */
2962 S_restore_magic(pTHX_ const void *p)
2965 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2966 SV* const sv = mgs->mgs_sv;
2971 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2973 #ifdef PERL_OLD_COPY_ON_WRITE
2974 /* While magic was saved (and off) sv_setsv may well have seen
2975 this SV as a prime candidate for COW. */
2977 sv_force_normal_flags(sv, 0);
2981 SvFLAGS(sv) |= mgs->mgs_flags;
2984 if (SvGMAGICAL(sv)) {
2985 /* downgrade public flags to private,
2986 and discard any other private flags */
2988 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2990 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2991 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2996 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
2998 /* If we're still on top of the stack, pop us off. (That condition
2999 * will be satisfied if restore_magic was called explicitly, but *not*
3000 * if it's being called via leave_scope.)
3001 * The reason for doing this is that otherwise, things like sv_2cv()
3002 * may leave alloc gunk on the savestack, and some code
3003 * (e.g. sighandler) doesn't expect that...
3005 if (PL_savestack_ix == mgs->mgs_ss_ix)
3007 I32 popval = SSPOPINT;
3008 assert(popval == SAVEt_DESTRUCTOR_X);
3009 PL_savestack_ix -= 2;
3011 assert(popval == SAVEt_ALLOC);
3013 PL_savestack_ix -= popval;
3019 S_unwind_handler_stack(pTHX_ const void *p)
3022 const U32 flags = *(const U32*)p;
3024 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3027 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3028 #if !defined(PERL_IMPLICIT_CONTEXT)
3030 SvREFCNT_dec(PL_sig_sv);
3035 =for apidoc magic_sethint
3037 Triggered by a store to %^H, records the key/value pair to
3038 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3039 anything that would need a deep copy. Maybe we should warn if we find a
3045 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3048 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3049 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3051 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3053 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3054 an alternative leaf in there, with PL_compiling.cop_hints being used if
3055 it's NULL. If needed for threads, the alternative could lock a mutex,
3056 or take other more complex action. */
3058 /* Something changed in %^H, so it will need to be restored on scope exit.
3059 Doing this here saves a lot of doing it manually in perl code (and
3060 forgetting to do it, and consequent subtle errors. */
3061 PL_hints |= HINT_LOCALIZE_HH;
3062 PL_compiling.cop_hints_hash
3063 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3068 =for apidoc magic_clearhint
3070 Triggered by a delete from %^H, records the key to
3071 C<PL_compiling.cop_hints_hash>.
3076 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3080 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3081 PERL_UNUSED_ARG(sv);
3083 assert(mg->mg_len == HEf_SVKEY);
3085 PERL_UNUSED_ARG(sv);
3087 PL_hints |= HINT_LOCALIZE_HH;
3088 PL_compiling.cop_hints_hash
3089 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3090 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3096 * c-indentation-style: bsd
3098 * indent-tabs-mode: t
3101 * ex: set ts=8 sts=4 sw=4 noet: