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 #ifdef HAS_PRCTL_SET_NAME
61 # include <sys/prctl.h>
64 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
65 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
67 Signal_t Perl_csighandler(int sig);
71 /* Missing protos on LynxOS */
72 void setruid(uid_t id);
73 void seteuid(uid_t id);
74 void setrgid(uid_t id);
75 void setegid(uid_t id);
79 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
88 /* MGS is typedef'ed to struct magic_state in perl.h */
91 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
96 PERL_ARGS_ASSERT_SAVE_MAGIC;
98 assert(SvMAGICAL(sv));
99 /* Turning READONLY off for a copy-on-write scalar (including shared
100 hash keys) is a bad idea. */
102 sv_force_normal_flags(sv, 0);
104 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
106 mgs = SSPTR(mgs_ix, MGS*);
108 mgs->mgs_magical = SvMAGICAL(sv);
109 mgs->mgs_readonly = SvREADONLY(sv) != 0;
110 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
114 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
115 /* No public flags are set, so promote any private flags to public. */
116 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
121 =for apidoc mg_magical
123 Turns on the magical status of an SV. See C<sv_magic>.
129 Perl_mg_magical(pTHX_ SV *sv)
132 PERL_ARGS_ASSERT_MG_MAGICAL;
136 if ((mg = SvMAGIC(sv))) {
138 const MGVTBL* const vtbl = mg->mg_virtual;
140 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 } while ((mg = mg->mg_moremagic));
148 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
154 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
157 S_is_container_magic(const MAGIC *mg)
160 switch (mg->mg_type) {
163 case PERL_MAGIC_regex_global:
164 case PERL_MAGIC_nkeys:
165 #ifdef USE_LOCALE_COLLATE
166 case PERL_MAGIC_collxfrm:
169 case PERL_MAGIC_taint:
171 case PERL_MAGIC_vstring:
172 case PERL_MAGIC_utf8:
173 case PERL_MAGIC_substr:
174 case PERL_MAGIC_defelem:
175 case PERL_MAGIC_arylen:
177 case PERL_MAGIC_backref:
178 case PERL_MAGIC_arylen_p:
179 case PERL_MAGIC_rhash:
180 case PERL_MAGIC_symtab:
181 case PERL_MAGIC_tied: /* treat as value, so 'local @tied' isn't tied */
191 Do magic after a value is retrieved from the SV. See C<sv_magic>.
197 Perl_mg_get(pTHX_ SV *sv)
200 const I32 mgs_ix = SSNEW(sizeof(MGS));
201 const bool was_temp = cBOOL(SvTEMP(sv));
203 MAGIC *newmg, *head, *cur, *mg;
204 /* guard against sv having being freed midway by holding a private
207 PERL_ARGS_ASSERT_MG_GET;
209 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
210 cause the SV's buffer to get stolen (and maybe other stuff).
213 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
218 save_magic(mgs_ix, sv);
220 /* We must call svt_get(sv, mg) for each valid entry in the linked
221 list of magic. svt_get() may delete the current entry, add new
222 magic to the head of the list, or upgrade the SV. AMS 20010810 */
224 newmg = cur = head = mg = SvMAGIC(sv);
226 const MGVTBL * const vtbl = mg->mg_virtual;
227 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
229 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
230 vtbl->svt_get(aTHX_ sv, mg);
232 /* guard against magic having been deleted - eg FETCH calling
235 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
239 /* recalculate flags if this entry was deleted. */
240 if (mg->mg_flags & MGf_GSKIP)
241 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
247 /* Have we finished with the new entries we saw? Start again
248 where we left off (unless there are more new entries). */
256 /* Were any new entries added? */
257 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
261 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
265 restore_magic(INT2PTR(void *, (IV)mgs_ix));
267 if (SvREFCNT(sv) == 1) {
268 /* We hold the last reference to this SV, which implies that the
269 SV was deleted as a side effect of the routines we called. */
278 Do magic after a value is assigned to the SV. See C<sv_magic>.
284 Perl_mg_set(pTHX_ SV *sv)
287 const I32 mgs_ix = SSNEW(sizeof(MGS));
291 PERL_ARGS_ASSERT_MG_SET;
293 save_magic(mgs_ix, sv);
295 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
296 const MGVTBL* vtbl = mg->mg_virtual;
297 nextmg = mg->mg_moremagic; /* it may delete itself */
298 if (mg->mg_flags & MGf_GSKIP) {
299 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
300 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
302 if (PL_localizing == 2 && !S_is_container_magic(mg))
304 if (vtbl && vtbl->svt_set)
305 vtbl->svt_set(aTHX_ sv, mg);
308 restore_magic(INT2PTR(void*, (IV)mgs_ix));
313 =for apidoc mg_length
315 Report on the SV's length. See C<sv_magic>.
321 Perl_mg_length(pTHX_ SV *sv)
327 PERL_ARGS_ASSERT_MG_LENGTH;
329 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
330 const MGVTBL * const vtbl = mg->mg_virtual;
331 if (vtbl && vtbl->svt_len) {
332 const I32 mgs_ix = SSNEW(sizeof(MGS));
333 save_magic(mgs_ix, sv);
334 /* omit MGf_GSKIP -- not changed here */
335 len = vtbl->svt_len(aTHX_ sv, mg);
336 restore_magic(INT2PTR(void*, (IV)mgs_ix));
342 /* You can't know whether it's UTF-8 until you get the string again...
344 const U8 *s = (U8*)SvPV_const(sv, len);
347 len = utf8_length(s, s + len);
354 Perl_mg_size(pTHX_ SV *sv)
358 PERL_ARGS_ASSERT_MG_SIZE;
360 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
361 const MGVTBL* const vtbl = mg->mg_virtual;
362 if (vtbl && vtbl->svt_len) {
363 const I32 mgs_ix = SSNEW(sizeof(MGS));
365 save_magic(mgs_ix, sv);
366 /* omit MGf_GSKIP -- not changed here */
367 len = vtbl->svt_len(aTHX_ sv, mg);
368 restore_magic(INT2PTR(void*, (IV)mgs_ix));
375 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
379 Perl_croak(aTHX_ "Size magic not implemented");
388 Clear something magical that the SV represents. See C<sv_magic>.
394 Perl_mg_clear(pTHX_ SV *sv)
396 const I32 mgs_ix = SSNEW(sizeof(MGS));
400 PERL_ARGS_ASSERT_MG_CLEAR;
402 save_magic(mgs_ix, sv);
404 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
405 const MGVTBL* const vtbl = mg->mg_virtual;
406 /* omit GSKIP -- never set here */
408 nextmg = mg->mg_moremagic; /* it may delete itself */
410 if (vtbl && vtbl->svt_clear)
411 vtbl->svt_clear(aTHX_ sv, mg);
414 restore_magic(INT2PTR(void*, (IV)mgs_ix));
421 Finds the magic pointer for type matching the SV. See C<sv_magic>.
427 Perl_mg_find(pTHX_ const SV *sv, int type)
432 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
433 if (mg->mg_type == type)
443 Copies the magic from one SV to another. See C<sv_magic>.
449 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
454 PERL_ARGS_ASSERT_MG_COPY;
456 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
457 const MGVTBL* const vtbl = mg->mg_virtual;
458 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
459 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
462 const char type = mg->mg_type;
463 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
465 (type == PERL_MAGIC_tied)
467 : (type == PERL_MAGIC_regdata && mg->mg_obj)
470 toLOWER(type), key, klen);
479 =for apidoc mg_localize
481 Copy some of the magic from an existing SV to new localized version of that
482 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
485 If setmagic is false then no set magic will be called on the new (empty) SV.
486 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
487 and that will handle the magic.
493 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
498 PERL_ARGS_ASSERT_MG_LOCALIZE;
500 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
501 const MGVTBL* const vtbl = mg->mg_virtual;
502 if (!S_is_container_magic(mg))
505 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
506 (void)vtbl->svt_local(aTHX_ nsv, mg);
508 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
509 mg->mg_ptr, mg->mg_len);
511 /* container types should remain read-only across localization */
512 SvFLAGS(nsv) |= SvREADONLY(sv);
515 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
516 SvFLAGS(nsv) |= SvMAGICAL(sv);
528 Free any magic storage used by the SV. See C<sv_magic>.
534 Perl_mg_free(pTHX_ SV *sv)
539 PERL_ARGS_ASSERT_MG_FREE;
541 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
542 const MGVTBL* const vtbl = mg->mg_virtual;
543 moremagic = mg->mg_moremagic;
544 if (vtbl && vtbl->svt_free)
545 vtbl->svt_free(aTHX_ sv, mg);
546 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
547 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
548 Safefree(mg->mg_ptr);
549 else if (mg->mg_len == HEf_SVKEY)
550 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
552 if (mg->mg_flags & MGf_REFCOUNTED)
553 SvREFCNT_dec(mg->mg_obj);
555 SvMAGIC_set(sv, moremagic);
557 SvMAGIC_set(sv, NULL);
565 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
570 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
573 register const REGEXP * const rx = PM_GETRE(PL_curpm);
575 if (mg->mg_obj) { /* @+ */
576 /* return the number possible */
577 return RX_NPARENS(rx);
579 I32 paren = RX_LASTPAREN(rx);
581 /* return the last filled */
583 && (RX_OFFS(rx)[paren].start == -1
584 || RX_OFFS(rx)[paren].end == -1) )
595 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
599 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
602 register const REGEXP * const rx = PM_GETRE(PL_curpm);
604 register const I32 paren = mg->mg_len;
609 if (paren <= (I32)RX_NPARENS(rx) &&
610 (s = RX_OFFS(rx)[paren].start) != -1 &&
611 (t = RX_OFFS(rx)[paren].end) != -1)
614 if (mg->mg_obj) /* @+ */
619 if (i > 0 && RX_MATCH_UTF8(rx)) {
620 const char * const b = RX_SUBBEG(rx);
622 i = utf8_length((U8*)b, (U8*)(b+i));
633 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
635 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
638 Perl_croak_no_modify(aTHX);
639 NORETURN_FUNCTION_END;
643 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
648 register const REGEXP * rx;
649 const char * const remaining = mg->mg_ptr + 1;
651 PERL_ARGS_ASSERT_MAGIC_LEN;
653 switch (*mg->mg_ptr) {
655 if (*remaining == '\0') { /* ^P */
657 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
659 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
663 case '\015': /* $^MATCH */
664 if (strEQ(remaining, "ATCH")) {
671 paren = RX_BUFF_IDX_PREMATCH;
675 paren = RX_BUFF_IDX_POSTMATCH;
679 paren = RX_BUFF_IDX_FULLMATCH;
681 case '1': case '2': case '3': case '4':
682 case '5': case '6': case '7': case '8': case '9':
683 paren = atoi(mg->mg_ptr);
685 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
687 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
690 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
693 if (ckWARN(WARN_UNINITIALIZED))
698 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
699 paren = RX_LASTPAREN(rx);
704 case '\016': /* ^N */
705 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
706 paren = RX_LASTCLOSEPAREN(rx);
713 if (!SvPOK(sv) && SvNIOK(sv)) {
721 #define SvRTRIM(sv) STMT_START { \
723 STRLEN len = SvCUR(sv); \
724 char * const p = SvPVX(sv); \
725 while (len > 0 && isSPACE(p[len-1])) \
727 SvCUR_set(sv, len); \
733 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
735 PERL_ARGS_ASSERT_EMULATE_COP_IO;
737 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
738 sv_setsv(sv, &PL_sv_undef);
742 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
743 SV *const value = Perl_refcounted_he_fetch(aTHX_
745 0, "open<", 5, 0, 0);
750 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
751 SV *const value = Perl_refcounted_he_fetch(aTHX_
753 0, "open>", 5, 0, 0);
761 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
765 register const char *s = NULL;
767 const char * const remaining = mg->mg_ptr + 1;
768 const char nextchar = *remaining;
770 PERL_ARGS_ASSERT_MAGIC_GET;
772 switch (*mg->mg_ptr) {
773 case '\001': /* ^A */
774 sv_setsv(sv, PL_bodytarget);
776 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
777 if (nextchar == '\0') {
778 sv_setiv(sv, (IV)PL_minus_c);
780 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
781 sv_setiv(sv, (IV)STATUS_NATIVE);
785 case '\004': /* ^D */
786 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
788 case '\005': /* ^E */
789 if (nextchar == '\0') {
792 # include <descrip.h>
793 # include <starlet.h>
795 $DESCRIPTOR(msgdsc,msg);
796 sv_setnv(sv,(NV) vaxc$errno);
797 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
798 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
803 if (!(_emx_env & 0x200)) { /* Under DOS */
804 sv_setnv(sv, (NV)errno);
805 sv_setpv(sv, errno ? Strerror(errno) : "");
807 if (errno != errno_isOS2) {
808 const int tmp = _syserrno();
809 if (tmp) /* 2nd call to _syserrno() makes it 0 */
812 sv_setnv(sv, (NV)Perl_rc);
813 sv_setpv(sv, os2error(Perl_rc));
817 const DWORD dwErr = GetLastError();
818 sv_setnv(sv, (NV)dwErr);
820 PerlProc_GetOSError(sv, dwErr);
829 sv_setnv(sv, (NV)errno);
830 sv_setpv(sv, errno ? Strerror(errno) : "");
835 SvNOK_on(sv); /* what a wonderful hack! */
837 else if (strEQ(remaining, "NCODING"))
838 sv_setsv(sv, PL_encoding);
840 case '\006': /* ^F */
841 sv_setiv(sv, (IV)PL_maxsysfd);
843 case '\010': /* ^H */
844 sv_setiv(sv, (IV)PL_hints);
846 case '\011': /* ^I */ /* NOT \t in EBCDIC */
847 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
849 case '\017': /* ^O & ^OPEN */
850 if (nextchar == '\0') {
851 sv_setpv(sv, PL_osname);
854 else if (strEQ(remaining, "PEN")) {
855 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
859 if (nextchar == '\0') { /* ^P */
860 sv_setiv(sv, (IV)PL_perldb);
861 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
862 goto do_prematch_fetch;
863 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
864 goto do_postmatch_fetch;
867 case '\023': /* ^S */
868 if (nextchar == '\0') {
869 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
872 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
877 case '\024': /* ^T */
878 if (nextchar == '\0') {
880 sv_setnv(sv, PL_basetime);
882 sv_setiv(sv, (IV)PL_basetime);
885 else if (strEQ(remaining, "AINT"))
886 sv_setiv(sv, PL_tainting
887 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
890 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
891 if (strEQ(remaining, "NICODE"))
892 sv_setuv(sv, (UV) PL_unicode);
893 else if (strEQ(remaining, "TF8LOCALE"))
894 sv_setuv(sv, (UV) PL_utf8locale);
895 else if (strEQ(remaining, "TF8CACHE"))
896 sv_setiv(sv, (IV) PL_utf8cache);
898 case '\027': /* ^W & $^WARNING_BITS */
899 if (nextchar == '\0')
900 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
901 else if (strEQ(remaining, "ARNING_BITS")) {
902 if (PL_compiling.cop_warnings == pWARN_NONE) {
903 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
905 else if (PL_compiling.cop_warnings == pWARN_STD) {
908 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
912 else if (PL_compiling.cop_warnings == pWARN_ALL) {
913 /* Get the bit mask for $warnings::Bits{all}, because
914 * it could have been extended by warnings::register */
915 HV * const bits=get_hv("warnings::Bits", 0);
917 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
919 sv_setsv(sv, *bits_all);
922 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
926 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
927 *PL_compiling.cop_warnings);
932 case '\015': /* $^MATCH */
933 if (strEQ(remaining, "ATCH")) {
934 case '1': case '2': case '3': case '4':
935 case '5': case '6': case '7': case '8': case '9': case '&':
936 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
938 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
939 * XXX Does the new way break anything?
941 paren = atoi(mg->mg_ptr); /* $& is in [0] */
942 CALLREG_NUMBUF_FETCH(rx,paren,sv);
945 sv_setsv(sv,&PL_sv_undef);
949 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
950 if (RX_LASTPAREN(rx)) {
951 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
955 sv_setsv(sv,&PL_sv_undef);
957 case '\016': /* ^N */
958 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
959 if (RX_LASTCLOSEPAREN(rx)) {
960 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
965 sv_setsv(sv,&PL_sv_undef);
969 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
970 CALLREG_NUMBUF_FETCH(rx,-2,sv);
973 sv_setsv(sv,&PL_sv_undef);
977 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
978 CALLREG_NUMBUF_FETCH(rx,-1,sv);
981 sv_setsv(sv,&PL_sv_undef);
984 if (GvIO(PL_last_in_gv)) {
985 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
990 sv_setiv(sv, (IV)STATUS_CURRENT);
991 #ifdef COMPLEX_STATUS
992 SvUPGRADE(sv, SVt_PVLV);
993 LvTARGOFF(sv) = PL_statusvalue;
994 LvTARGLEN(sv) = PL_statusvalue_vms;
999 if (!isGV_with_GP(PL_defoutgv))
1001 else if (GvIOp(PL_defoutgv))
1002 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1006 sv_setpv(sv,GvENAME(PL_defoutgv));
1007 sv_catpvs(sv,"_TOP");
1011 if (!isGV_with_GP(PL_defoutgv))
1013 else if (GvIOp(PL_defoutgv))
1014 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1016 s = GvENAME(PL_defoutgv);
1020 if (GvIO(PL_defoutgv))
1021 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1024 if (GvIO(PL_defoutgv))
1025 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1028 if (GvIO(PL_defoutgv))
1029 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1036 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1039 if (GvIO(PL_defoutgv))
1040 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1044 sv_copypv(sv, PL_ors_sv);
1050 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1052 sv_setnv(sv, (NV)errno);
1055 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1056 sv_setpv(sv, os2error(Perl_rc));
1059 sv_setpv(sv, errno ? Strerror(errno) : "");
1061 SvPOK_on(sv); /* may have got removed during taint processing */
1066 SvNOK_on(sv); /* what a wonderful hack! */
1069 sv_setiv(sv, (IV)PL_uid);
1072 sv_setiv(sv, (IV)PL_euid);
1075 sv_setiv(sv, (IV)PL_gid);
1078 sv_setiv(sv, (IV)PL_egid);
1080 #ifdef HAS_GETGROUPS
1082 Groups_t *gary = NULL;
1083 I32 i, num_groups = getgroups(0, gary);
1084 Newx(gary, num_groups, Groups_t);
1085 num_groups = getgroups(num_groups, gary);
1086 for (i = 0; i < num_groups; i++)
1087 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1090 (void)SvIOK_on(sv); /* what a wonderful hack! */
1100 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1102 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1104 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1106 if (uf && uf->uf_val)
1107 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1112 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1115 STRLEN len = 0, klen;
1116 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1117 const char * const ptr = MgPV_const(mg,klen);
1120 PERL_ARGS_ASSERT_MAGIC_SETENV;
1122 #ifdef DYNAMIC_ENV_FETCH
1123 /* We just undefd an environment var. Is a replacement */
1124 /* waiting in the wings? */
1126 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1128 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1132 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1133 /* And you'll never guess what the dog had */
1134 /* in its mouth... */
1136 MgTAINTEDDIR_off(mg);
1138 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1139 char pathbuf[256], eltbuf[256], *cp, *elt;
1143 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1145 do { /* DCL$PATH may be a search list */
1146 while (1) { /* as may dev portion of any element */
1147 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1148 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1149 cando_by_name(S_IWUSR,0,elt) ) {
1150 MgTAINTEDDIR_on(mg);
1154 if ((cp = strchr(elt, ':')) != NULL)
1156 if (my_trnlnm(elt, eltbuf, j++))
1162 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1165 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1166 const char * const strend = s + len;
1168 while (s < strend) {
1172 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1173 const char path_sep = '|';
1175 const char path_sep = ':';
1177 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1178 s, strend, path_sep, &i);
1180 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1182 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1184 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1186 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1187 MgTAINTEDDIR_on(mg);
1193 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1199 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1201 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1202 PERL_UNUSED_ARG(sv);
1203 my_setenv(MgPV_nolen_const(mg),NULL);
1208 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1211 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1212 PERL_UNUSED_ARG(mg);
1214 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1216 if (PL_localizing) {
1219 hv_iterinit(MUTABLE_HV(sv));
1220 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1222 my_setenv(hv_iterkey(entry, &keylen),
1223 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1231 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1234 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1235 PERL_UNUSED_ARG(sv);
1236 PERL_UNUSED_ARG(mg);
1238 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1246 #ifdef HAS_SIGPROCMASK
1248 restore_sigmask(pTHX_ SV *save_sv)
1250 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1251 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1255 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1258 /* Are we fetching a signal entry? */
1259 int i = (I16)mg->mg_private;
1261 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1264 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1269 sv_setsv(sv,PL_psig_ptr[i]);
1271 Sighandler_t sigstate = rsignal_state(i);
1272 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1273 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1276 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1277 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1280 /* cache state so we don't fetch it again */
1281 if(sigstate == (Sighandler_t) SIG_IGN)
1282 sv_setpvs(sv,"IGNORE");
1284 sv_setsv(sv,&PL_sv_undef);
1285 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1292 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1294 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1295 PERL_UNUSED_ARG(sv);
1297 magic_setsig(NULL, mg);
1298 return sv_unmagic(sv, mg->mg_type);
1302 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1303 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1305 Perl_csighandler(int sig)
1308 #ifdef PERL_GET_SIG_CONTEXT
1309 dTHXa(PERL_GET_SIG_CONTEXT);
1313 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1314 (void) rsignal(sig, PL_csighandlerp);
1315 if (PL_sig_ignoring[sig]) return;
1317 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1318 if (PL_sig_defaulting[sig])
1319 #ifdef KILL_BY_SIGPRC
1320 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1335 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1336 /* Call the perl level handler now--
1337 * with risk we may be in malloc() or being destructed etc. */
1338 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1339 (*PL_sighandlerp)(sig, NULL, NULL);
1341 (*PL_sighandlerp)(sig);
1344 if (!PL_psig_pend) return;
1345 /* Set a flag to say this signal is pending, that is awaiting delivery after
1346 * the current Perl opcode completes */
1347 PL_psig_pend[sig]++;
1349 #ifndef SIG_PENDING_DIE_COUNT
1350 # define SIG_PENDING_DIE_COUNT 120
1352 /* Add one to say _a_ signal is pending */
1353 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1354 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1355 (unsigned long)SIG_PENDING_DIE_COUNT);
1359 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1361 Perl_csighandler_init(void)
1364 if (PL_sig_handlers_initted) return;
1366 for (sig = 1; sig < SIG_SIZE; sig++) {
1367 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1369 PL_sig_defaulting[sig] = 1;
1370 (void) rsignal(sig, PL_csighandlerp);
1372 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1373 PL_sig_ignoring[sig] = 0;
1376 PL_sig_handlers_initted = 1;
1381 Perl_despatch_signals(pTHX)
1386 for (sig = 1; sig < SIG_SIZE; sig++) {
1387 if (PL_psig_pend[sig]) {
1389 PERL_BLOCKSIG_ADD(set, sig);
1390 PL_psig_pend[sig] = 0;
1391 PERL_BLOCKSIG_BLOCK(set);
1392 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1393 (*PL_sighandlerp)(sig, NULL, NULL);
1395 (*PL_sighandlerp)(sig);
1397 PERL_BLOCKSIG_UNBLOCK(set);
1403 /* sv of NULL signifies that we're acting as magic_clearsig. */
1405 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1410 /* Need to be careful with SvREFCNT_dec(), because that can have side
1411 * effects (due to closures). We must make sure that the new disposition
1412 * is in place before it is called.
1416 #ifdef HAS_SIGPROCMASK
1420 register const char *s = MgPV_const(mg,len);
1422 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1425 if (strEQ(s,"__DIE__"))
1427 else if (strEQ(s,"__WARN__")
1428 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1429 /* Merge the existing behaviours, which are as follows:
1430 magic_setsig, we always set svp to &PL_warnhook
1431 (hence we always change the warnings handler)
1432 For magic_clearsig, we don't change the warnings handler if it's
1433 set to the &PL_warnhook. */
1436 Perl_croak(aTHX_ "No such hook: %s", s);
1439 if (*svp != PERL_WARNHOOK_FATAL)
1445 i = (I16)mg->mg_private;
1447 i = whichsig(s); /* ...no, a brick */
1448 mg->mg_private = (U16)i;
1452 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1455 #ifdef HAS_SIGPROCMASK
1456 /* Avoid having the signal arrive at a bad time, if possible. */
1459 sigprocmask(SIG_BLOCK, &set, &save);
1461 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1462 SAVEFREESV(save_sv);
1463 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1466 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1467 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1469 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1470 PL_sig_ignoring[i] = 0;
1472 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1473 PL_sig_defaulting[i] = 0;
1475 to_dec = PL_psig_ptr[i];
1477 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1478 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1480 /* Signals don't change name during the program's execution, so once
1481 they're cached in the appropriate slot of PL_psig_name, they can
1484 Ideally we'd find some way of making SVs at (C) compile time, or
1485 at least, doing most of the work. */
1486 if (!PL_psig_name[i]) {
1487 PL_psig_name[i] = newSVpvn(s, len);
1488 SvREADONLY_on(PL_psig_name[i]);
1491 SvREFCNT_dec(PL_psig_name[i]);
1492 PL_psig_name[i] = NULL;
1493 PL_psig_ptr[i] = NULL;
1496 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1498 (void)rsignal(i, PL_csighandlerp);
1501 *svp = SvREFCNT_inc_simple_NN(sv);
1503 if (sv && SvOK(sv)) {
1504 s = SvPV_force(sv, len);
1508 if (sv && strEQ(s,"IGNORE")) {
1510 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1511 PL_sig_ignoring[i] = 1;
1512 (void)rsignal(i, PL_csighandlerp);
1514 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1518 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1520 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1521 PL_sig_defaulting[i] = 1;
1522 (void)rsignal(i, PL_csighandlerp);
1524 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1530 * We should warn if HINT_STRICT_REFS, but without
1531 * access to a known hint bit in a known OP, we can't
1532 * tell whether HINT_STRICT_REFS is in force or not.
1534 if (!strchr(s,':') && !strchr(s,'\''))
1535 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1538 (void)rsignal(i, PL_csighandlerp);
1540 *svp = SvREFCNT_inc_simple_NN(sv);
1544 #ifdef HAS_SIGPROCMASK
1548 SvREFCNT_dec(to_dec);
1551 #endif /* !PERL_MICRO */
1554 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1557 PERL_ARGS_ASSERT_MAGIC_SETISA;
1558 PERL_UNUSED_ARG(sv);
1560 /* Skip _isaelem because _isa will handle it shortly */
1561 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1564 return magic_clearisa(NULL, mg);
1567 /* sv of NULL signifies that we're acting as magic_setisa. */
1569 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1574 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1576 /* Bail out if destruction is going on */
1577 if(PL_dirty) return 0;
1580 av_clear(MUTABLE_AV(sv));
1582 /* XXX Once it's possible, we need to
1583 detect that our @ISA is aliased in
1584 other stashes, and act on the stashes
1585 of all of the aliases */
1587 /* The first case occurs via setisa,
1588 the second via setisa_elem, which
1589 calls this same magic */
1591 SvTYPE(mg->mg_obj) == SVt_PVGV
1592 ? (const GV *)mg->mg_obj
1593 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1597 mro_isa_changed_in(stash);
1603 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1606 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1607 PERL_UNUSED_ARG(sv);
1608 PERL_UNUSED_ARG(mg);
1609 PL_amagic_generation++;
1615 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1617 HV * const hv = MUTABLE_HV(LvTARG(sv));
1620 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1621 PERL_UNUSED_ARG(mg);
1624 (void) hv_iterinit(hv);
1625 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1628 while (hv_iternext(hv))
1633 sv_setiv(sv, (IV)i);
1638 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1640 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1641 PERL_UNUSED_ARG(mg);
1643 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1649 =for apidoc magic_methcall
1651 Invoke a magic method (like FETCH).
1653 * sv and mg are the tied thinggy and the tie magic;
1654 * meth is the name of the method to call;
1655 * argc is the number of args (in addition to $self) to pass to the method;
1656 the args themselves are any values following the argc argument.
1658 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1659 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
1661 Returns the SV (if any) returned by the method, or NULL on failure.
1668 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1675 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1678 PUSHSTACKi(PERLSI_MAGIC);
1682 PUSHs(SvTIED_obj(sv, mg));
1683 if (flags & G_UNDEF_FILL) {
1685 PUSHs(&PL_sv_undef);
1687 } else if (argc > 0) {
1689 va_start(args, argc);
1692 SV *const sv = va_arg(args, SV *);
1699 if (flags & G_DISCARD) {
1700 call_method(meth, G_SCALAR|G_DISCARD);
1703 if (call_method(meth, G_SCALAR))
1704 ret = *PL_stack_sp--;
1712 /* wrapper for magic_methcall that creates the first arg */
1715 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1721 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1724 if (mg->mg_len >= 0) {
1725 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1727 else if (mg->mg_len == HEf_SVKEY)
1728 arg1 = MUTABLE_SV(mg->mg_ptr);
1730 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1731 arg1 = newSViv((IV)(mg->mg_len));
1735 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1737 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1741 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1746 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1748 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1755 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1757 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1759 if (mg->mg_type == PERL_MAGIC_tiedelem)
1760 mg->mg_flags |= MGf_GSKIP;
1761 magic_methpack(sv,mg,"FETCH");
1766 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1772 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1774 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1775 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1776 * public flags indicate its value based on copying from $val. Doing
1777 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1778 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1779 * wrong if $val happened to be tainted, as sv hasn't got magic
1780 * enabled, even though taint magic is in the chain. In which case,
1781 * fake up a temporary tainted value (this is easier than temporarily
1782 * re-enabling magic on sv). */
1784 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1785 && (tmg->mg_len & 1))
1787 val = sv_mortalcopy(sv);
1793 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1798 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1800 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1802 return magic_methpack(sv,mg,"DELETE");
1807 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1813 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1815 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1817 retval = SvIV(retsv)-1;
1819 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1821 return (U32) retval;
1825 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1829 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1831 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1836 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1841 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1843 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1844 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1851 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1853 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1855 return magic_methpack(sv,mg,"EXISTS");
1859 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1863 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1864 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1866 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1868 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1870 if (HvEITER_get(hv))
1871 /* we are in an iteration so the hash cannot be empty */
1873 /* no xhv_eiter so now use FIRSTKEY */
1874 key = sv_newmortal();
1875 magic_nextpack(MUTABLE_SV(hv), mg, key);
1876 HvEITER_set(hv, NULL); /* need to reset iterator */
1877 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1880 /* there is a SCALAR method that we can call */
1881 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
1883 retval = &PL_sv_undef;
1888 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1891 GV * const gv = PL_DBline;
1892 const I32 i = SvTRUE(sv);
1893 SV ** const svp = av_fetch(GvAV(gv),
1894 atoi(MgPV_nolen_const(mg)), FALSE);
1896 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1898 if (svp && SvIOKp(*svp)) {
1899 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1901 /* set or clear breakpoint in the relevant control op */
1903 o->op_flags |= OPf_SPECIAL;
1905 o->op_flags &= ~OPf_SPECIAL;
1912 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1915 AV * const obj = MUTABLE_AV(mg->mg_obj);
1917 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1920 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1928 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1931 AV * const obj = MUTABLE_AV(mg->mg_obj);
1933 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1936 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1938 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
1939 "Attempt to set length of freed array");
1945 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1949 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1950 PERL_UNUSED_ARG(sv);
1952 /* during global destruction, mg_obj may already have been freed */
1953 if (PL_in_clean_all)
1956 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1959 /* arylen scalar holds a pointer back to the array, but doesn't own a
1960 reference. Hence the we (the array) are about to go away with it
1961 still pointing at us. Clear its pointer, else it would be pointing
1962 at free memory. See the comment in sv_magic about reference loops,
1963 and why it can't own a reference to us. */
1970 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1973 SV* const lsv = LvTARG(sv);
1975 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1976 PERL_UNUSED_ARG(mg);
1978 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1979 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1980 if (found && found->mg_len >= 0) {
1981 I32 i = found->mg_len;
1983 sv_pos_b2u(lsv, &i);
1984 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1993 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1996 SV* const lsv = LvTARG(sv);
2002 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2003 PERL_UNUSED_ARG(mg);
2005 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2006 found = mg_find(lsv, PERL_MAGIC_regex_global);
2012 #ifdef PERL_OLD_COPY_ON_WRITE
2014 sv_force_normal_flags(lsv, 0);
2016 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2019 else if (!SvOK(sv)) {
2023 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2025 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2028 ulen = sv_len_utf8(lsv);
2038 else if (pos > (SSize_t)len)
2043 sv_pos_u2b(lsv, &p, 0);
2047 found->mg_len = pos;
2048 found->mg_flags &= ~MGf_MINMATCH;
2054 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2057 SV * const lsv = LvTARG(sv);
2058 const char * const tmps = SvPV_const(lsv,len);
2059 STRLEN offs = LvTARGOFF(sv);
2060 STRLEN rem = LvTARGLEN(sv);
2062 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2063 PERL_UNUSED_ARG(mg);
2066 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
2069 if (rem > len - offs)
2071 sv_setpvn(sv, tmps + offs, rem);
2078 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2082 const char * const tmps = SvPV_const(sv, len);
2083 SV * const lsv = LvTARG(sv);
2084 STRLEN lvoff = LvTARGOFF(sv);
2085 STRLEN lvlen = LvTARGLEN(sv);
2087 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2088 PERL_UNUSED_ARG(mg);
2091 sv_utf8_upgrade(lsv);
2092 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2093 sv_insert(lsv, lvoff, lvlen, tmps, len);
2094 LvTARGLEN(sv) = sv_len_utf8(sv);
2097 else if (lsv && SvUTF8(lsv)) {
2099 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2100 LvTARGLEN(sv) = len;
2101 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2102 sv_insert(lsv, lvoff, lvlen, utf8, len);
2106 sv_insert(lsv, lvoff, lvlen, tmps, len);
2107 LvTARGLEN(sv) = len;
2114 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2118 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2119 PERL_UNUSED_ARG(sv);
2121 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2126 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2130 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2131 PERL_UNUSED_ARG(sv);
2133 /* update taint status */
2142 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2144 SV * const lsv = LvTARG(sv);
2146 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2147 PERL_UNUSED_ARG(mg);
2150 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2158 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2160 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2161 PERL_UNUSED_ARG(mg);
2162 do_vecset(sv); /* XXX slurp this routine */
2167 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2172 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2174 if (LvTARGLEN(sv)) {
2176 SV * const ahv = LvTARG(sv);
2177 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2182 AV *const av = MUTABLE_AV(LvTARG(sv));
2183 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2184 targ = AvARRAY(av)[LvTARGOFF(sv)];
2186 if (targ && (targ != &PL_sv_undef)) {
2187 /* somebody else defined it for us */
2188 SvREFCNT_dec(LvTARG(sv));
2189 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2191 SvREFCNT_dec(mg->mg_obj);
2193 mg->mg_flags &= ~MGf_REFCOUNTED;
2198 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2203 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2205 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2206 PERL_UNUSED_ARG(mg);
2210 sv_setsv(LvTARG(sv), sv);
2211 SvSETMAGIC(LvTARG(sv));
2217 Perl_vivify_defelem(pTHX_ SV *sv)
2223 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2225 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2228 SV * const ahv = LvTARG(sv);
2229 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2232 if (!value || value == &PL_sv_undef)
2233 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2236 AV *const av = MUTABLE_AV(LvTARG(sv));
2237 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2238 LvTARG(sv) = NULL; /* array can't be extended */
2240 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2241 if (!svp || (value = *svp) == &PL_sv_undef)
2242 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2245 SvREFCNT_inc_simple_void(value);
2246 SvREFCNT_dec(LvTARG(sv));
2249 SvREFCNT_dec(mg->mg_obj);
2251 mg->mg_flags &= ~MGf_REFCOUNTED;
2255 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2257 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2258 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2263 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2265 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2266 PERL_UNUSED_CONTEXT;
2268 if (!isGV_with_GP(sv))
2274 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2276 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2278 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2280 if (uf && uf->uf_set)
2281 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2286 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2288 const char type = mg->mg_type;
2290 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2292 if (type == PERL_MAGIC_qr) {
2293 } else if (type == PERL_MAGIC_bm) {
2297 assert(type == PERL_MAGIC_fm);
2300 return sv_unmagic(sv, type);
2303 #ifdef USE_LOCALE_COLLATE
2305 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2307 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2310 * RenE<eacute> Descartes said "I think not."
2311 * and vanished with a faint plop.
2313 PERL_UNUSED_CONTEXT;
2314 PERL_UNUSED_ARG(sv);
2316 Safefree(mg->mg_ptr);
2322 #endif /* USE_LOCALE_COLLATE */
2324 /* Just clear the UTF-8 cache data. */
2326 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2328 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2329 PERL_UNUSED_CONTEXT;
2330 PERL_UNUSED_ARG(sv);
2331 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2333 mg->mg_len = -1; /* The mg_len holds the len cache. */
2338 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2341 register const char *s;
2343 register const REGEXP * rx;
2344 const char * const remaining = mg->mg_ptr + 1;
2348 PERL_ARGS_ASSERT_MAGIC_SET;
2350 switch (*mg->mg_ptr) {
2351 case '\015': /* $^MATCH */
2352 if (strEQ(remaining, "ATCH"))
2354 case '`': /* ${^PREMATCH} caught below */
2356 paren = RX_BUFF_IDX_PREMATCH;
2358 case '\'': /* ${^POSTMATCH} caught below */
2360 paren = RX_BUFF_IDX_POSTMATCH;
2364 paren = RX_BUFF_IDX_FULLMATCH;
2366 case '1': case '2': case '3': case '4':
2367 case '5': case '6': case '7': case '8': case '9':
2368 paren = atoi(mg->mg_ptr);
2370 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2371 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2373 /* Croak with a READONLY error when a numbered match var is
2374 * set without a previous pattern match. Unless it's C<local $1>
2376 if (!PL_localizing) {
2377 Perl_croak_no_modify(aTHX);
2381 case '\001': /* ^A */
2382 sv_setsv(PL_bodytarget, sv);
2384 case '\003': /* ^C */
2385 PL_minus_c = cBOOL(SvIV(sv));
2388 case '\004': /* ^D */
2390 s = SvPV_nolen_const(sv);
2391 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2392 if (DEBUG_x_TEST || DEBUG_B_TEST)
2393 dump_all_perl(!DEBUG_B_TEST);
2395 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2398 case '\005': /* ^E */
2399 if (*(mg->mg_ptr+1) == '\0') {
2401 set_vaxc_errno(SvIV(sv));
2404 SetLastError( SvIV(sv) );
2407 os2_setsyserrno(SvIV(sv));
2409 /* will anyone ever use this? */
2410 SETERRNO(SvIV(sv), 4);
2415 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2416 SvREFCNT_dec(PL_encoding);
2417 if (SvOK(sv) || SvGMAGICAL(sv)) {
2418 PL_encoding = newSVsv(sv);
2425 case '\006': /* ^F */
2426 PL_maxsysfd = SvIV(sv);
2428 case '\010': /* ^H */
2429 PL_hints = SvIV(sv);
2431 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2432 Safefree(PL_inplace);
2433 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2435 case '\017': /* ^O */
2436 if (*(mg->mg_ptr+1) == '\0') {
2437 Safefree(PL_osname);
2440 TAINT_PROPER("assigning to $^O");
2441 PL_osname = savesvpv(sv);
2444 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2446 const char *const start = SvPV(sv, len);
2447 const char *out = (const char*)memchr(start, '\0', len);
2451 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2452 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2454 /* Opening for input is more common than opening for output, so
2455 ensure that hints for input are sooner on linked list. */
2456 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2458 : newSVpvs_flags("", SvUTF8(sv));
2459 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2462 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2464 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2468 case '\020': /* ^P */
2469 if (*remaining == '\0') { /* ^P */
2470 PL_perldb = SvIV(sv);
2471 if (PL_perldb && !PL_DBsingle)
2474 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2476 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2480 case '\024': /* ^T */
2482 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2484 PL_basetime = (Time_t)SvIV(sv);
2487 case '\025': /* ^UTF8CACHE */
2488 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2489 PL_utf8cache = (signed char) sv_2iv(sv);
2492 case '\027': /* ^W & $^WARNING_BITS */
2493 if (*(mg->mg_ptr+1) == '\0') {
2494 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2496 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2497 | (i ? G_WARN_ON : G_WARN_OFF) ;
2500 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2501 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2502 if (!SvPOK(sv) && PL_localizing) {
2503 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2504 PL_compiling.cop_warnings = pWARN_NONE;
2509 int accumulate = 0 ;
2510 int any_fatals = 0 ;
2511 const char * const ptr = SvPV_const(sv, len) ;
2512 for (i = 0 ; i < len ; ++i) {
2513 accumulate |= ptr[i] ;
2514 any_fatals |= (ptr[i] & 0xAA) ;
2517 if (!specialWARN(PL_compiling.cop_warnings))
2518 PerlMemShared_free(PL_compiling.cop_warnings);
2519 PL_compiling.cop_warnings = pWARN_NONE;
2521 /* Yuck. I can't see how to abstract this: */
2522 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2523 WARN_ALL) && !any_fatals) {
2524 if (!specialWARN(PL_compiling.cop_warnings))
2525 PerlMemShared_free(PL_compiling.cop_warnings);
2526 PL_compiling.cop_warnings = pWARN_ALL;
2527 PL_dowarn |= G_WARN_ONCE ;
2531 const char *const p = SvPV_const(sv, len);
2533 PL_compiling.cop_warnings
2534 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2537 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2538 PL_dowarn |= G_WARN_ONCE ;
2546 if (PL_localizing) {
2547 if (PL_localizing == 1)
2548 SAVESPTR(PL_last_in_gv);
2550 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2551 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2554 if (isGV_with_GP(PL_defoutgv)) {
2555 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2556 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2557 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2561 if (isGV_with_GP(PL_defoutgv)) {
2562 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2563 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2564 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2568 if (isGV_with_GP(PL_defoutgv))
2569 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2572 if (isGV_with_GP(PL_defoutgv)) {
2573 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2574 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2575 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2579 if (isGV_with_GP(PL_defoutgv))
2580 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2584 IO * const io = GvIO(PL_defoutgv);
2587 if ((SvIV(sv)) == 0)
2588 IoFLAGS(io) &= ~IOf_FLUSH;
2590 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2591 PerlIO *ofp = IoOFP(io);
2593 (void)PerlIO_flush(ofp);
2594 IoFLAGS(io) |= IOf_FLUSH;
2600 SvREFCNT_dec(PL_rs);
2601 PL_rs = newSVsv(sv);
2604 SvREFCNT_dec(PL_ors_sv);
2605 if (SvOK(sv) || SvGMAGICAL(sv)) {
2606 PL_ors_sv = newSVsv(sv);
2613 CopARYBASE_set(&PL_compiling, SvIV(sv));
2616 #ifdef COMPLEX_STATUS
2617 if (PL_localizing == 2) {
2618 SvUPGRADE(sv, SVt_PVLV);
2619 PL_statusvalue = LvTARGOFF(sv);
2620 PL_statusvalue_vms = LvTARGLEN(sv);
2624 #ifdef VMSISH_STATUS
2626 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2629 STATUS_UNIX_EXIT_SET(SvIV(sv));
2634 # define PERL_VMS_BANG vaxc$errno
2636 # define PERL_VMS_BANG 0
2638 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2639 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2644 if (PL_delaymagic) {
2645 PL_delaymagic |= DM_RUID;
2646 break; /* don't do magic till later */
2649 (void)setruid((Uid_t)PL_uid);
2652 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2654 #ifdef HAS_SETRESUID
2655 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2657 if (PL_uid == PL_euid) { /* special case $< = $> */
2659 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2660 if (PL_uid != 0 && PerlProc_getuid() == 0)
2661 (void)PerlProc_setuid(0);
2663 (void)PerlProc_setuid(PL_uid);
2665 PL_uid = PerlProc_getuid();
2666 Perl_croak(aTHX_ "setruid() not implemented");
2671 PL_uid = PerlProc_getuid();
2675 if (PL_delaymagic) {
2676 PL_delaymagic |= DM_EUID;
2677 break; /* don't do magic till later */
2680 (void)seteuid((Uid_t)PL_euid);
2683 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2685 #ifdef HAS_SETRESUID
2686 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2688 if (PL_euid == PL_uid) /* special case $> = $< */
2689 PerlProc_setuid(PL_euid);
2691 PL_euid = PerlProc_geteuid();
2692 Perl_croak(aTHX_ "seteuid() not implemented");
2697 PL_euid = PerlProc_geteuid();
2701 if (PL_delaymagic) {
2702 PL_delaymagic |= DM_RGID;
2703 break; /* don't do magic till later */
2706 (void)setrgid((Gid_t)PL_gid);
2709 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2711 #ifdef HAS_SETRESGID
2712 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2714 if (PL_gid == PL_egid) /* special case $( = $) */
2715 (void)PerlProc_setgid(PL_gid);
2717 PL_gid = PerlProc_getgid();
2718 Perl_croak(aTHX_ "setrgid() not implemented");
2723 PL_gid = PerlProc_getgid();
2726 #ifdef HAS_SETGROUPS
2728 const char *p = SvPV_const(sv, len);
2729 Groups_t *gary = NULL;
2730 #ifdef _SC_NGROUPS_MAX
2731 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2736 int maxgrp = NGROUPS;
2742 for (i = 0; i < maxgrp; ++i) {
2743 while (*p && !isSPACE(*p))
2750 Newx(gary, i + 1, Groups_t);
2752 Renew(gary, i + 1, Groups_t);
2756 (void)setgroups(i, gary);
2759 #else /* HAS_SETGROUPS */
2761 #endif /* HAS_SETGROUPS */
2762 if (PL_delaymagic) {
2763 PL_delaymagic |= DM_EGID;
2764 break; /* don't do magic till later */
2767 (void)setegid((Gid_t)PL_egid);
2770 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2772 #ifdef HAS_SETRESGID
2773 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2775 if (PL_egid == PL_gid) /* special case $) = $( */
2776 (void)PerlProc_setgid(PL_egid);
2778 PL_egid = PerlProc_getegid();
2779 Perl_croak(aTHX_ "setegid() not implemented");
2784 PL_egid = PerlProc_getegid();
2787 PL_chopset = SvPV_force(sv,len);
2790 LOCK_DOLLARZERO_MUTEX;
2791 #ifdef HAS_SETPROCTITLE
2792 /* The BSDs don't show the argv[] in ps(1) output, they
2793 * show a string from the process struct and provide
2794 * the setproctitle() routine to manipulate that. */
2795 if (PL_origalen != 1) {
2796 s = SvPV_const(sv, len);
2797 # if __FreeBSD_version > 410001
2798 /* The leading "-" removes the "perl: " prefix,
2799 * but not the "(perl) suffix from the ps(1)
2800 * output, because that's what ps(1) shows if the
2801 * argv[] is modified. */
2802 setproctitle("-%s", s);
2803 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2804 /* This doesn't really work if you assume that
2805 * $0 = 'foobar'; will wipe out 'perl' from the $0
2806 * because in ps(1) output the result will be like
2807 * sprintf("perl: %s (perl)", s)
2808 * I guess this is a security feature:
2809 * one (a user process) cannot get rid of the original name.
2811 setproctitle("%s", s);
2814 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2815 if (PL_origalen != 1) {
2817 s = SvPV_const(sv, len);
2818 un.pst_command = (char *)s;
2819 pstat(PSTAT_SETCMD, un, len, 0, 0);
2822 if (PL_origalen > 1) {
2823 /* PL_origalen is set in perl_parse(). */
2824 s = SvPV_force(sv,len);
2825 if (len >= (STRLEN)PL_origalen-1) {
2826 /* Longer than original, will be truncated. We assume that
2827 * PL_origalen bytes are available. */
2828 Copy(s, PL_origargv[0], PL_origalen-1, char);
2831 /* Shorter than original, will be padded. */
2833 /* Special case for Mac OS X: see [perl #38868] */
2836 /* Is the space counterintuitive? Yes.
2837 * (You were expecting \0?)
2838 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2840 const int pad = ' ';
2842 Copy(s, PL_origargv[0], len, char);
2843 PL_origargv[0][len] = 0;
2844 memset(PL_origargv[0] + len + 1,
2845 pad, PL_origalen - len - 1);
2847 PL_origargv[0][PL_origalen-1] = 0;
2848 for (i = 1; i < PL_origargc; i++)
2850 #ifdef HAS_PRCTL_SET_NAME
2851 /* Set the legacy process name in addition to the POSIX name on Linux */
2852 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2853 /* diag_listed_as: SKIPME */
2854 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2859 UNLOCK_DOLLARZERO_MUTEX;
2866 Perl_whichsig(pTHX_ const char *sig)
2868 register char* const* sigv;
2870 PERL_ARGS_ASSERT_WHICHSIG;
2871 PERL_UNUSED_CONTEXT;
2873 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2874 if (strEQ(sig,*sigv))
2875 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2877 if (strEQ(sig,"CHLD"))
2881 if (strEQ(sig,"CLD"))
2888 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2889 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2891 Perl_sighandler(int sig)
2894 #ifdef PERL_GET_SIG_CONTEXT
2895 dTHXa(PERL_GET_SIG_CONTEXT);
2902 SV * const tSv = PL_Sv;
2906 XPV * const tXpv = PL_Xpv;
2908 if (PL_savestack_ix + 15 <= PL_savestack_max)
2910 if (PL_markstack_ptr < PL_markstack_max - 2)
2912 if (PL_scopestack_ix < PL_scopestack_max - 3)
2915 if (!PL_psig_ptr[sig]) {
2916 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2921 /* Max number of items pushed there is 3*n or 4. We cannot fix
2922 infinity, so we fix 4 (in fact 5): */
2924 PL_savestack_ix += 5; /* Protect save in progress. */
2925 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2928 PL_markstack_ptr++; /* Protect mark. */
2930 PL_scopestack_ix += 1;
2931 /* sv_2cv is too complicated, try a simpler variant first: */
2932 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2933 || SvTYPE(cv) != SVt_PVCV) {
2935 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2938 if (!cv || !CvROOT(cv)) {
2939 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2940 PL_sig_name[sig], (gv ? GvENAME(gv)
2947 if(PL_psig_name[sig]) {
2948 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2950 #if !defined(PERL_IMPLICIT_CONTEXT)
2954 sv = sv_newmortal();
2955 sv_setpv(sv,PL_sig_name[sig]);
2958 PUSHSTACKi(PERLSI_SIGNAL);
2961 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2963 struct sigaction oact;
2965 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2968 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2969 /* The siginfo fields signo, code, errno, pid, uid,
2970 * addr, status, and band are defined by POSIX/SUSv3. */
2971 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2972 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2973 #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. */
2974 hv_stores(sih, "errno", newSViv(sip->si_errno));
2975 hv_stores(sih, "status", newSViv(sip->si_status));
2976 hv_stores(sih, "uid", newSViv(sip->si_uid));
2977 hv_stores(sih, "pid", newSViv(sip->si_pid));
2978 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2979 hv_stores(sih, "band", newSViv(sip->si_band));
2983 mPUSHp((char *)sip, sizeof(*sip));
2991 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2994 if (SvTRUE(ERRSV)) {
2996 #ifdef HAS_SIGPROCMASK
2997 /* Handler "died", for example to get out of a restart-able read().
2998 * Before we re-do that on its behalf re-enable the signal which was
2999 * blocked by the system when we entered.
3003 sigaddset(&set,sig);
3004 sigprocmask(SIG_UNBLOCK, &set, NULL);
3006 /* Not clear if this will work */
3007 (void)rsignal(sig, SIG_IGN);
3008 (void)rsignal(sig, PL_csighandlerp);
3010 #endif /* !PERL_MICRO */
3015 PL_savestack_ix -= 8; /* Unprotect save in progress. */
3019 PL_scopestack_ix -= 1;
3022 PL_op = myop; /* Apparently not needed... */
3024 PL_Sv = tSv; /* Restore global temporaries. */
3031 S_restore_magic(pTHX_ const void *p)
3034 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3035 SV* const sv = mgs->mgs_sv;
3040 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3042 #ifdef PERL_OLD_COPY_ON_WRITE
3043 /* While magic was saved (and off) sv_setsv may well have seen
3044 this SV as a prime candidate for COW. */
3046 sv_force_normal_flags(sv, 0);
3049 if (mgs->mgs_readonly)
3051 if (mgs->mgs_magical)
3052 SvFLAGS(sv) |= mgs->mgs_magical;
3055 if (SvGMAGICAL(sv)) {
3056 /* downgrade public flags to private,
3057 and discard any other private flags */
3059 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3061 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3062 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3067 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3069 /* If we're still on top of the stack, pop us off. (That condition
3070 * will be satisfied if restore_magic was called explicitly, but *not*
3071 * if it's being called via leave_scope.)
3072 * The reason for doing this is that otherwise, things like sv_2cv()
3073 * may leave alloc gunk on the savestack, and some code
3074 * (e.g. sighandler) doesn't expect that...
3076 if (PL_savestack_ix == mgs->mgs_ss_ix)
3078 UV popval = SSPOPUV;
3079 assert(popval == SAVEt_DESTRUCTOR_X);
3080 PL_savestack_ix -= 2;
3082 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3083 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3089 S_unwind_handler_stack(pTHX_ const void *p)
3092 const U32 flags = *(const U32*)p;
3094 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3097 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3098 #if !defined(PERL_IMPLICIT_CONTEXT)
3100 SvREFCNT_dec(PL_sig_sv);
3105 =for apidoc magic_sethint
3107 Triggered by a store to %^H, records the key/value pair to
3108 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3109 anything that would need a deep copy. Maybe we should warn if we find a
3115 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3118 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3119 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3121 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3123 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3124 an alternative leaf in there, with PL_compiling.cop_hints being used if
3125 it's NULL. If needed for threads, the alternative could lock a mutex,
3126 or take other more complex action. */
3128 /* Something changed in %^H, so it will need to be restored on scope exit.
3129 Doing this here saves a lot of doing it manually in perl code (and
3130 forgetting to do it, and consequent subtle errors. */
3131 PL_hints |= HINT_LOCALIZE_HH;
3132 PL_compiling.cop_hints_hash
3133 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3138 =for apidoc magic_clearhint
3140 Triggered by a delete from %^H, records the key to
3141 C<PL_compiling.cop_hints_hash>.
3146 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3150 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3151 PERL_UNUSED_ARG(sv);
3153 assert(mg->mg_len == HEf_SVKEY);
3155 PERL_UNUSED_ARG(sv);
3157 PL_hints |= HINT_LOCALIZE_HH;
3158 PL_compiling.cop_hints_hash
3159 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3160 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3165 =for apidoc magic_clearhints
3167 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3172 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3174 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3175 PERL_UNUSED_ARG(sv);
3176 PERL_UNUSED_ARG(mg);
3177 if (PL_compiling.cop_hints_hash) {
3178 Perl_refcounted_he_free(aTHX_ PL_compiling.cop_hints_hash);
3179 PL_compiling.cop_hints_hash = NULL;
3186 * c-indentation-style: bsd
3188 * indent-tabs-mode: t
3191 * ex: set ts=8 sts=4 sw=4 noet: