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.
84 /* MGS is typedef'ed to struct magic_state in perl.h */
87 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
92 PERL_ARGS_ASSERT_SAVE_MAGIC;
94 assert(SvMAGICAL(sv));
95 /* Turning READONLY off for a copy-on-write scalar (including shared
96 hash keys) is a bad idea. */
98 sv_force_normal_flags(sv, 0);
100 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
102 mgs = SSPTR(mgs_ix, MGS*);
104 mgs->mgs_magical = SvMAGICAL(sv);
105 mgs->mgs_readonly = SvREADONLY(sv) != 0;
106 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
110 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
111 /* No public flags are set, so promote any private flags to public. */
112 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
117 =for apidoc mg_magical
119 Turns on the magical status of an SV. See C<sv_magic>.
125 Perl_mg_magical(pTHX_ SV *sv)
128 PERL_ARGS_ASSERT_MG_MAGICAL;
132 if ((mg = SvMAGIC(sv))) {
134 const MGVTBL* const vtbl = mg->mg_virtual;
136 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
143 } while ((mg = mg->mg_moremagic));
144 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
150 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
153 S_is_container_magic(const MAGIC *mg)
156 switch (mg->mg_type) {
159 case PERL_MAGIC_regex_global:
160 case PERL_MAGIC_nkeys:
161 #ifdef USE_LOCALE_COLLATE
162 case PERL_MAGIC_collxfrm:
165 case PERL_MAGIC_taint:
167 case PERL_MAGIC_vstring:
168 case PERL_MAGIC_utf8:
169 case PERL_MAGIC_substr:
170 case PERL_MAGIC_defelem:
171 case PERL_MAGIC_arylen:
173 case PERL_MAGIC_backref:
174 case PERL_MAGIC_arylen_p:
175 case PERL_MAGIC_rhash:
176 case PERL_MAGIC_symtab:
186 Do magic after a value is retrieved from the SV. See C<sv_magic>.
192 Perl_mg_get(pTHX_ SV *sv)
195 const I32 mgs_ix = SSNEW(sizeof(MGS));
196 const bool was_temp = (bool)SvTEMP(sv);
198 MAGIC *newmg, *head, *cur, *mg;
199 /* guard against sv having being freed midway by holding a private
202 PERL_ARGS_ASSERT_MG_GET;
204 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
205 cause the SV's buffer to get stolen (and maybe other stuff).
208 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
213 save_magic(mgs_ix, sv);
215 /* We must call svt_get(sv, mg) for each valid entry in the linked
216 list of magic. svt_get() may delete the current entry, add new
217 magic to the head of the list, or upgrade the SV. AMS 20010810 */
219 newmg = cur = head = mg = SvMAGIC(sv);
221 const MGVTBL * const vtbl = mg->mg_virtual;
222 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
224 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
225 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
227 /* guard against magic having been deleted - eg FETCH calling
230 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
234 /* recalculate flags if this entry was deleted. */
235 if (mg->mg_flags & MGf_GSKIP)
236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
242 /* Have we finished with the new entries we saw? Start again
243 where we left off (unless there are more new entries). */
251 /* Were any new entries added? */
252 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
256 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
260 restore_magic(INT2PTR(void *, (IV)mgs_ix));
262 if (SvREFCNT(sv) == 1) {
263 /* We hold the last reference to this SV, which implies that the
264 SV was deleted as a side effect of the routines we called. */
273 Do magic after a value is assigned to the SV. See C<sv_magic>.
279 Perl_mg_set(pTHX_ SV *sv)
282 const I32 mgs_ix = SSNEW(sizeof(MGS));
286 PERL_ARGS_ASSERT_MG_SET;
288 save_magic(mgs_ix, sv);
290 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
291 const MGVTBL* vtbl = mg->mg_virtual;
292 nextmg = mg->mg_moremagic; /* it may delete itself */
293 if (mg->mg_flags & MGf_GSKIP) {
294 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
295 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
297 if (PL_localizing == 2 && !S_is_container_magic(mg))
299 if (vtbl && vtbl->svt_set)
300 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
303 restore_magic(INT2PTR(void*, (IV)mgs_ix));
308 =for apidoc mg_length
310 Report on the SV's length. See C<sv_magic>.
316 Perl_mg_length(pTHX_ SV *sv)
322 PERL_ARGS_ASSERT_MG_LENGTH;
324 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
325 const MGVTBL * const vtbl = mg->mg_virtual;
326 if (vtbl && vtbl->svt_len) {
327 const I32 mgs_ix = SSNEW(sizeof(MGS));
328 save_magic(mgs_ix, sv);
329 /* omit MGf_GSKIP -- not changed here */
330 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
331 restore_magic(INT2PTR(void*, (IV)mgs_ix));
337 /* You can't know whether it's UTF-8 until you get the string again...
339 const U8 *s = (U8*)SvPV_const(sv, len);
342 len = utf8_length(s, s + len);
349 Perl_mg_size(pTHX_ SV *sv)
353 PERL_ARGS_ASSERT_MG_SIZE;
355 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
356 const MGVTBL* const vtbl = mg->mg_virtual;
357 if (vtbl && vtbl->svt_len) {
358 const I32 mgs_ix = SSNEW(sizeof(MGS));
360 save_magic(mgs_ix, sv);
361 /* omit MGf_GSKIP -- not changed here */
362 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
363 restore_magic(INT2PTR(void*, (IV)mgs_ix));
370 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
374 Perl_croak(aTHX_ "Size magic not implemented");
383 Clear something magical that the SV represents. See C<sv_magic>.
389 Perl_mg_clear(pTHX_ SV *sv)
391 const I32 mgs_ix = SSNEW(sizeof(MGS));
395 PERL_ARGS_ASSERT_MG_CLEAR;
397 save_magic(mgs_ix, sv);
399 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
400 const MGVTBL* const vtbl = mg->mg_virtual;
401 /* omit GSKIP -- never set here */
403 nextmg = mg->mg_moremagic; /* it may delete itself */
405 if (vtbl && vtbl->svt_clear)
406 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
409 restore_magic(INT2PTR(void*, (IV)mgs_ix));
416 Finds the magic pointer for type matching the SV. See C<sv_magic>.
422 Perl_mg_find(pTHX_ const SV *sv, int type)
427 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
428 if (mg->mg_type == type)
438 Copies the magic from one SV to another. See C<sv_magic>.
444 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
449 PERL_ARGS_ASSERT_MG_COPY;
451 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
452 const MGVTBL* const vtbl = mg->mg_virtual;
453 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
454 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
457 const char type = mg->mg_type;
458 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
460 (type == PERL_MAGIC_tied)
462 : (type == PERL_MAGIC_regdata && mg->mg_obj)
465 toLOWER(type), key, klen);
474 =for apidoc mg_localize
476 Copy some of the magic from an existing SV to new localized version of that
477 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
480 If setmagic is false then no set magic will be called on the new (empty) SV.
481 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
482 and that will handle the magic.
488 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
493 PERL_ARGS_ASSERT_MG_LOCALIZE;
495 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
496 const MGVTBL* const vtbl = mg->mg_virtual;
497 if (!S_is_container_magic(mg))
500 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
501 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
503 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
504 mg->mg_ptr, mg->mg_len);
506 /* container types should remain read-only across localization */
507 SvFLAGS(nsv) |= SvREADONLY(sv);
510 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
511 SvFLAGS(nsv) |= SvMAGICAL(sv);
523 Free any magic storage used by the SV. See C<sv_magic>.
529 Perl_mg_free(pTHX_ SV *sv)
534 PERL_ARGS_ASSERT_MG_FREE;
536 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
537 const MGVTBL* const vtbl = mg->mg_virtual;
538 moremagic = mg->mg_moremagic;
539 if (vtbl && vtbl->svt_free)
540 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
541 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
542 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
543 Safefree(mg->mg_ptr);
544 else if (mg->mg_len == HEf_SVKEY)
545 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
547 if (mg->mg_flags & MGf_REFCOUNTED)
548 SvREFCNT_dec(mg->mg_obj);
550 SvMAGIC_set(sv, moremagic);
552 SvMAGIC_set(sv, NULL);
560 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
565 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
568 register const REGEXP * const rx = PM_GETRE(PL_curpm);
570 if (mg->mg_obj) { /* @+ */
571 /* return the number possible */
572 return RX_NPARENS(rx);
574 I32 paren = RX_LASTPAREN(rx);
576 /* return the last filled */
578 && (RX_OFFS(rx)[paren].start == -1
579 || RX_OFFS(rx)[paren].end == -1) )
590 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
594 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
597 register const REGEXP * const rx = PM_GETRE(PL_curpm);
599 register const I32 paren = mg->mg_len;
604 if (paren <= (I32)RX_NPARENS(rx) &&
605 (s = RX_OFFS(rx)[paren].start) != -1 &&
606 (t = RX_OFFS(rx)[paren].end) != -1)
609 if (mg->mg_obj) /* @+ */
614 if (i > 0 && RX_MATCH_UTF8(rx)) {
615 const char * const b = RX_SUBBEG(rx);
617 i = utf8_length((U8*)b, (U8*)(b+i));
628 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
630 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
633 Perl_croak(aTHX_ "%s", PL_no_modify);
634 NORETURN_FUNCTION_END;
638 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
643 register const REGEXP * rx;
644 const char * const remaining = mg->mg_ptr + 1;
646 PERL_ARGS_ASSERT_MAGIC_LEN;
648 switch (*mg->mg_ptr) {
650 if (*remaining == '\0') { /* ^P */
652 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
654 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
658 case '\015': /* $^MATCH */
659 if (strEQ(remaining, "ATCH")) {
666 paren = RX_BUFF_IDX_PREMATCH;
670 paren = RX_BUFF_IDX_POSTMATCH;
674 paren = RX_BUFF_IDX_FULLMATCH;
676 case '1': case '2': case '3': case '4':
677 case '5': case '6': case '7': case '8': case '9':
678 paren = atoi(mg->mg_ptr);
680 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
682 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
685 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
688 if (ckWARN(WARN_UNINITIALIZED))
693 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
694 paren = RX_LASTPAREN(rx);
699 case '\016': /* ^N */
700 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
701 paren = RX_LASTCLOSEPAREN(rx);
708 if (!SvPOK(sv) && SvNIOK(sv)) {
716 #define SvRTRIM(sv) STMT_START { \
718 STRLEN len = SvCUR(sv); \
719 char * const p = SvPVX(sv); \
720 while (len > 0 && isSPACE(p[len-1])) \
722 SvCUR_set(sv, len); \
728 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
730 PERL_ARGS_ASSERT_EMULATE_COP_IO;
732 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
733 sv_setsv(sv, &PL_sv_undef);
737 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
738 SV *const value = Perl_refcounted_he_fetch(aTHX_
740 0, "open<", 5, 0, 0);
745 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
746 SV *const value = Perl_refcounted_he_fetch(aTHX_
748 0, "open>", 5, 0, 0);
756 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
760 register char *s = NULL;
762 const char * const remaining = mg->mg_ptr + 1;
763 const char nextchar = *remaining;
765 PERL_ARGS_ASSERT_MAGIC_GET;
767 switch (*mg->mg_ptr) {
768 case '\001': /* ^A */
769 sv_setsv(sv, PL_bodytarget);
771 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
772 if (nextchar == '\0') {
773 sv_setiv(sv, (IV)PL_minus_c);
775 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
776 sv_setiv(sv, (IV)STATUS_NATIVE);
780 case '\004': /* ^D */
781 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
783 case '\005': /* ^E */
784 if (nextchar == '\0') {
787 # include <descrip.h>
788 # include <starlet.h>
790 $DESCRIPTOR(msgdsc,msg);
791 sv_setnv(sv,(NV) vaxc$errno);
792 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
793 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
798 if (!(_emx_env & 0x200)) { /* Under DOS */
799 sv_setnv(sv, (NV)errno);
800 sv_setpv(sv, errno ? Strerror(errno) : "");
802 if (errno != errno_isOS2) {
803 const int tmp = _syserrno();
804 if (tmp) /* 2nd call to _syserrno() makes it 0 */
807 sv_setnv(sv, (NV)Perl_rc);
808 sv_setpv(sv, os2error(Perl_rc));
812 const DWORD dwErr = GetLastError();
813 sv_setnv(sv, (NV)dwErr);
815 PerlProc_GetOSError(sv, dwErr);
824 sv_setnv(sv, (NV)errno);
825 sv_setpv(sv, errno ? Strerror(errno) : "");
830 SvNOK_on(sv); /* what a wonderful hack! */
832 else if (strEQ(remaining, "NCODING"))
833 sv_setsv(sv, PL_encoding);
835 case '\006': /* ^F */
836 sv_setiv(sv, (IV)PL_maxsysfd);
838 case '\010': /* ^H */
839 sv_setiv(sv, (IV)PL_hints);
841 case '\011': /* ^I */ /* NOT \t in EBCDIC */
842 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
844 case '\017': /* ^O & ^OPEN */
845 if (nextchar == '\0') {
846 sv_setpv(sv, PL_osname);
849 else if (strEQ(remaining, "PEN")) {
850 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
854 if (nextchar == '\0') { /* ^P */
855 sv_setiv(sv, (IV)PL_perldb);
856 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
857 goto do_prematch_fetch;
858 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
859 goto do_postmatch_fetch;
862 case '\023': /* ^S */
863 if (nextchar == '\0') {
864 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
867 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
872 case '\024': /* ^T */
873 if (nextchar == '\0') {
875 sv_setnv(sv, PL_basetime);
877 sv_setiv(sv, (IV)PL_basetime);
880 else if (strEQ(remaining, "AINT"))
881 sv_setiv(sv, PL_tainting
882 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
885 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
886 if (strEQ(remaining, "NICODE"))
887 sv_setuv(sv, (UV) PL_unicode);
888 else if (strEQ(remaining, "TF8LOCALE"))
889 sv_setuv(sv, (UV) PL_utf8locale);
890 else if (strEQ(remaining, "TF8CACHE"))
891 sv_setiv(sv, (IV) PL_utf8cache);
893 case '\027': /* ^W & $^WARNING_BITS */
894 if (nextchar == '\0')
895 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
896 else if (strEQ(remaining, "ARNING_BITS")) {
897 if (PL_compiling.cop_warnings == pWARN_NONE) {
898 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
900 else if (PL_compiling.cop_warnings == pWARN_STD) {
903 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
907 else if (PL_compiling.cop_warnings == pWARN_ALL) {
908 /* Get the bit mask for $warnings::Bits{all}, because
909 * it could have been extended by warnings::register */
910 HV * const bits=get_hv("warnings::Bits", 0);
912 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
914 sv_setsv(sv, *bits_all);
917 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
921 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
922 *PL_compiling.cop_warnings);
927 case '\015': /* $^MATCH */
928 if (strEQ(remaining, "ATCH")) {
929 case '1': case '2': case '3': case '4':
930 case '5': case '6': case '7': case '8': case '9': case '&':
931 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
933 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
934 * XXX Does the new way break anything?
936 paren = atoi(mg->mg_ptr); /* $& is in [0] */
937 CALLREG_NUMBUF_FETCH(rx,paren,sv);
940 sv_setsv(sv,&PL_sv_undef);
944 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
945 if (RX_LASTPAREN(rx)) {
946 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
950 sv_setsv(sv,&PL_sv_undef);
952 case '\016': /* ^N */
953 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
954 if (RX_LASTCLOSEPAREN(rx)) {
955 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
960 sv_setsv(sv,&PL_sv_undef);
964 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
965 CALLREG_NUMBUF_FETCH(rx,-2,sv);
968 sv_setsv(sv,&PL_sv_undef);
972 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
973 CALLREG_NUMBUF_FETCH(rx,-1,sv);
976 sv_setsv(sv,&PL_sv_undef);
979 if (GvIO(PL_last_in_gv)) {
980 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
985 sv_setiv(sv, (IV)STATUS_CURRENT);
986 #ifdef COMPLEX_STATUS
987 SvUPGRADE(sv, SVt_PVLV);
988 LvTARGOFF(sv) = PL_statusvalue;
989 LvTARGLEN(sv) = PL_statusvalue_vms;
994 if (GvIOp(PL_defoutgv))
995 s = IoTOP_NAME(GvIOp(PL_defoutgv));
999 sv_setpv(sv,GvENAME(PL_defoutgv));
1000 sv_catpvs(sv,"_TOP");
1004 if (GvIOp(PL_defoutgv))
1005 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1007 s = GvENAME(PL_defoutgv);
1011 if (GvIOp(PL_defoutgv))
1012 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1015 if (GvIOp(PL_defoutgv))
1016 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1019 if (GvIOp(PL_defoutgv))
1020 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1027 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1030 if (GvIOp(PL_defoutgv))
1031 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1035 sv_copypv(sv, PL_ors_sv);
1041 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1043 sv_setnv(sv, (NV)errno);
1046 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1047 sv_setpv(sv, os2error(Perl_rc));
1050 sv_setpv(sv, errno ? Strerror(errno) : "");
1051 SvPOK_on(sv); /* may have got removed during taint processing */
1056 SvNOK_on(sv); /* what a wonderful hack! */
1059 sv_setiv(sv, (IV)PL_uid);
1062 sv_setiv(sv, (IV)PL_euid);
1065 sv_setiv(sv, (IV)PL_gid);
1068 sv_setiv(sv, (IV)PL_egid);
1070 #ifdef HAS_GETGROUPS
1072 Groups_t *gary = NULL;
1073 I32 i, num_groups = getgroups(0, gary);
1074 Newx(gary, num_groups, Groups_t);
1075 num_groups = getgroups(num_groups, gary);
1076 for (i = 0; i < num_groups; i++)
1077 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1080 (void)SvIOK_on(sv); /* what a wonderful hack! */
1090 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1092 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1094 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1096 if (uf && uf->uf_val)
1097 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1102 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1105 STRLEN len = 0, klen;
1106 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1107 const char * const ptr = MgPV_const(mg,klen);
1110 PERL_ARGS_ASSERT_MAGIC_SETENV;
1112 #ifdef DYNAMIC_ENV_FETCH
1113 /* We just undefd an environment var. Is a replacement */
1114 /* waiting in the wings? */
1116 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1118 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1122 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1123 /* And you'll never guess what the dog had */
1124 /* in its mouth... */
1126 MgTAINTEDDIR_off(mg);
1128 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1129 char pathbuf[256], eltbuf[256], *cp, *elt;
1133 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1135 do { /* DCL$PATH may be a search list */
1136 while (1) { /* as may dev portion of any element */
1137 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1138 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1139 cando_by_name(S_IWUSR,0,elt) ) {
1140 MgTAINTEDDIR_on(mg);
1144 if ((cp = strchr(elt, ':')) != NULL)
1146 if (my_trnlnm(elt, eltbuf, j++))
1152 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1155 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1156 const char * const strend = s + len;
1158 while (s < strend) {
1162 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1163 const char path_sep = '|';
1165 const char path_sep = ':';
1167 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1168 s, strend, path_sep, &i);
1170 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1172 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1174 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1176 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1177 MgTAINTEDDIR_on(mg);
1183 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1189 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1191 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1192 PERL_UNUSED_ARG(sv);
1193 my_setenv(MgPV_nolen_const(mg),NULL);
1198 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1201 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1202 PERL_UNUSED_ARG(mg);
1204 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1206 if (PL_localizing) {
1209 hv_iterinit(MUTABLE_HV(sv));
1210 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1212 my_setenv(hv_iterkey(entry, &keylen),
1213 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1221 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1224 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1225 PERL_UNUSED_ARG(sv);
1226 PERL_UNUSED_ARG(mg);
1228 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1236 #ifdef HAS_SIGPROCMASK
1238 restore_sigmask(pTHX_ SV *save_sv)
1240 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1241 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1245 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1248 /* Are we fetching a signal entry? */
1249 int i = (I16)mg->mg_private;
1251 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1254 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1259 sv_setsv(sv,PL_psig_ptr[i]);
1261 Sighandler_t sigstate = rsignal_state(i);
1262 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1263 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1266 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1267 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1270 /* cache state so we don't fetch it again */
1271 if(sigstate == (Sighandler_t) SIG_IGN)
1272 sv_setpvs(sv,"IGNORE");
1274 sv_setsv(sv,&PL_sv_undef);
1275 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1282 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1284 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1285 PERL_UNUSED_ARG(sv);
1287 magic_setsig(NULL, mg);
1288 return sv_unmagic(sv, mg->mg_type);
1292 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1293 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1295 Perl_csighandler(int sig)
1298 #ifdef PERL_GET_SIG_CONTEXT
1299 dTHXa(PERL_GET_SIG_CONTEXT);
1303 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1304 (void) rsignal(sig, PL_csighandlerp);
1305 if (PL_sig_ignoring[sig]) return;
1307 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1308 if (PL_sig_defaulting[sig])
1309 #ifdef KILL_BY_SIGPRC
1310 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1325 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1326 /* Call the perl level handler now--
1327 * with risk we may be in malloc() or being destructed etc. */
1328 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1329 (*PL_sighandlerp)(sig, NULL, NULL);
1331 (*PL_sighandlerp)(sig);
1334 if (!PL_psig_pend) return;
1335 /* Set a flag to say this signal is pending, that is awaiting delivery after
1336 * the current Perl opcode completes */
1337 PL_psig_pend[sig]++;
1339 #ifndef SIG_PENDING_DIE_COUNT
1340 # define SIG_PENDING_DIE_COUNT 120
1342 /* Add one to say _a_ signal is pending */
1343 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1344 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1345 (unsigned long)SIG_PENDING_DIE_COUNT);
1349 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1351 Perl_csighandler_init(void)
1354 if (PL_sig_handlers_initted) return;
1356 for (sig = 1; sig < SIG_SIZE; sig++) {
1357 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1359 PL_sig_defaulting[sig] = 1;
1360 (void) rsignal(sig, PL_csighandlerp);
1362 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1363 PL_sig_ignoring[sig] = 0;
1366 PL_sig_handlers_initted = 1;
1371 Perl_despatch_signals(pTHX)
1376 for (sig = 1; sig < SIG_SIZE; sig++) {
1377 if (PL_psig_pend[sig]) {
1378 PERL_BLOCKSIG_ADD(set, sig);
1379 PL_psig_pend[sig] = 0;
1380 PERL_BLOCKSIG_BLOCK(set);
1381 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1382 (*PL_sighandlerp)(sig, NULL, NULL);
1384 (*PL_sighandlerp)(sig);
1386 PERL_BLOCKSIG_UNBLOCK(set);
1391 /* sv of NULL signifies that we're acting as magic_clearsig. */
1393 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1398 /* Need to be careful with SvREFCNT_dec(), because that can have side
1399 * effects (due to closures). We must make sure that the new disposition
1400 * is in place before it is called.
1404 #ifdef HAS_SIGPROCMASK
1408 register const char *s = MgPV_const(mg,len);
1410 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1413 if (strEQ(s,"__DIE__"))
1415 else if (strEQ(s,"__WARN__")
1416 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1417 /* Merge the existing behaviours, which are as follows:
1418 magic_setsig, we always set svp to &PL_warnhook
1419 (hence we always change the warnings handler)
1420 For magic_clearsig, we don't change the warnings handler if it's
1421 set to the &PL_warnhook. */
1424 Perl_croak(aTHX_ "No such hook: %s", s);
1427 if (*svp != PERL_WARNHOOK_FATAL)
1433 i = (I16)mg->mg_private;
1435 i = whichsig(s); /* ...no, a brick */
1436 mg->mg_private = (U16)i;
1440 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1443 #ifdef HAS_SIGPROCMASK
1444 /* Avoid having the signal arrive at a bad time, if possible. */
1447 sigprocmask(SIG_BLOCK, &set, &save);
1449 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1450 SAVEFREESV(save_sv);
1451 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1454 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1455 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1457 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1458 PL_sig_ignoring[i] = 0;
1460 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1461 PL_sig_defaulting[i] = 0;
1463 to_dec = PL_psig_ptr[i];
1465 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1466 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1468 /* Signals don't change name during the program's execution, so once
1469 they're cached in the appropriate slot of PL_psig_name, they can
1472 Ideally we'd find some way of making SVs at (C) compile time, or
1473 at least, doing most of the work. */
1474 if (!PL_psig_name[i]) {
1475 PL_psig_name[i] = newSVpvn(s, len);
1476 SvREADONLY_on(PL_psig_name[i]);
1479 SvREFCNT_dec(PL_psig_name[i]);
1480 PL_psig_name[i] = NULL;
1481 PL_psig_ptr[i] = NULL;
1484 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1486 (void)rsignal(i, PL_csighandlerp);
1489 *svp = SvREFCNT_inc_simple_NN(sv);
1491 if (sv && SvOK(sv)) {
1492 s = SvPV_force(sv, len);
1496 if (sv && strEQ(s,"IGNORE")) {
1498 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1499 PL_sig_ignoring[i] = 1;
1500 (void)rsignal(i, PL_csighandlerp);
1502 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1506 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1508 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1509 PL_sig_defaulting[i] = 1;
1510 (void)rsignal(i, PL_csighandlerp);
1512 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1518 * We should warn if HINT_STRICT_REFS, but without
1519 * access to a known hint bit in a known OP, we can't
1520 * tell whether HINT_STRICT_REFS is in force or not.
1522 if (!strchr(s,':') && !strchr(s,'\''))
1523 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1526 (void)rsignal(i, PL_csighandlerp);
1528 *svp = SvREFCNT_inc_simple_NN(sv);
1532 #ifdef HAS_SIGPROCMASK
1536 SvREFCNT_dec(to_dec);
1539 #endif /* !PERL_MICRO */
1542 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1545 PERL_ARGS_ASSERT_MAGIC_SETISA;
1546 PERL_UNUSED_ARG(sv);
1548 /* Skip _isaelem because _isa will handle it shortly */
1549 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1552 return magic_clearisa(NULL, mg);
1555 /* sv of NULL signifies that we're acting as magic_setisa. */
1557 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1562 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1564 /* Bail out if destruction is going on */
1565 if(PL_dirty) return 0;
1568 av_clear(MUTABLE_AV(sv));
1570 /* XXX Once it's possible, we need to
1571 detect that our @ISA is aliased in
1572 other stashes, and act on the stashes
1573 of all of the aliases */
1575 /* The first case occurs via setisa,
1576 the second via setisa_elem, which
1577 calls this same magic */
1579 SvTYPE(mg->mg_obj) == SVt_PVGV
1580 ? (const GV *)mg->mg_obj
1581 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
1585 mro_isa_changed_in(stash);
1591 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1594 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1595 PERL_UNUSED_ARG(sv);
1596 PERL_UNUSED_ARG(mg);
1597 PL_amagic_generation++;
1603 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1605 HV * const hv = MUTABLE_HV(LvTARG(sv));
1608 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1609 PERL_UNUSED_ARG(mg);
1612 (void) hv_iterinit(hv);
1613 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1616 while (hv_iternext(hv))
1621 sv_setiv(sv, (IV)i);
1626 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1628 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1629 PERL_UNUSED_ARG(mg);
1631 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1636 /* caller is responsible for stack switching/cleanup */
1638 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1643 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1647 PUSHs(SvTIED_obj(sv, mg));
1650 if (mg->mg_len >= 0)
1651 mPUSHp(mg->mg_ptr, mg->mg_len);
1652 else if (mg->mg_len == HEf_SVKEY)
1653 PUSHs(MUTABLE_SV(mg->mg_ptr));
1655 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1664 return call_method(meth, flags);
1668 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1672 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1676 PUSHSTACKi(PERLSI_MAGIC);
1678 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1679 sv_setsv(sv, *PL_stack_sp--);
1689 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1691 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1694 mg->mg_flags |= MGf_GSKIP;
1695 magic_methpack(sv,mg,"FETCH");
1700 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1704 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1707 PUSHSTACKi(PERLSI_MAGIC);
1708 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1715 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1717 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1719 return magic_methpack(sv,mg,"DELETE");
1724 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1729 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1733 PUSHSTACKi(PERLSI_MAGIC);
1734 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1735 sv = *PL_stack_sp--;
1736 retval = SvIV(sv)-1;
1738 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1743 return (U32) retval;
1747 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1751 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1754 PUSHSTACKi(PERLSI_MAGIC);
1756 XPUSHs(SvTIED_obj(sv, mg));
1758 call_method("CLEAR", G_SCALAR|G_DISCARD);
1766 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1769 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1771 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1775 PUSHSTACKi(PERLSI_MAGIC);
1778 PUSHs(SvTIED_obj(sv, mg));
1783 if (call_method(meth, G_SCALAR))
1784 sv_setsv(key, *PL_stack_sp--);
1793 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1795 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1797 return magic_methpack(sv,mg,"EXISTS");
1801 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1805 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1806 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1808 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1810 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1812 if (HvEITER_get(hv))
1813 /* we are in an iteration so the hash cannot be empty */
1815 /* no xhv_eiter so now use FIRSTKEY */
1816 key = sv_newmortal();
1817 magic_nextpack(MUTABLE_SV(hv), mg, key);
1818 HvEITER_set(hv, NULL); /* need to reset iterator */
1819 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1822 /* there is a SCALAR method that we can call */
1824 PUSHSTACKi(PERLSI_MAGIC);
1830 if (call_method("SCALAR", G_SCALAR))
1831 retval = *PL_stack_sp--;
1833 retval = &PL_sv_undef;
1840 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1843 GV * const gv = PL_DBline;
1844 const I32 i = SvTRUE(sv);
1845 SV ** const svp = av_fetch(GvAV(gv),
1846 atoi(MgPV_nolen_const(mg)), FALSE);
1848 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1850 if (svp && SvIOKp(*svp)) {
1851 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1853 /* set or clear breakpoint in the relevant control op */
1855 o->op_flags |= OPf_SPECIAL;
1857 o->op_flags &= ~OPf_SPECIAL;
1864 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1867 AV * const obj = MUTABLE_AV(mg->mg_obj);
1869 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1872 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1880 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1883 AV * const obj = MUTABLE_AV(mg->mg_obj);
1885 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1888 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1890 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
1891 "Attempt to set length of freed array");
1897 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1901 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1902 PERL_UNUSED_ARG(sv);
1904 /* during global destruction, mg_obj may already have been freed */
1905 if (PL_in_clean_all)
1908 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1911 /* arylen scalar holds a pointer back to the array, but doesn't own a
1912 reference. Hence the we (the array) are about to go away with it
1913 still pointing at us. Clear its pointer, else it would be pointing
1914 at free memory. See the comment in sv_magic about reference loops,
1915 and why it can't own a reference to us. */
1922 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1925 SV* const lsv = LvTARG(sv);
1927 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1928 PERL_UNUSED_ARG(mg);
1930 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1931 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1932 if (found && found->mg_len >= 0) {
1933 I32 i = found->mg_len;
1935 sv_pos_b2u(lsv, &i);
1936 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1945 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1948 SV* const lsv = LvTARG(sv);
1954 PERL_ARGS_ASSERT_MAGIC_SETPOS;
1955 PERL_UNUSED_ARG(mg);
1957 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1958 found = mg_find(lsv, PERL_MAGIC_regex_global);
1964 #ifdef PERL_OLD_COPY_ON_WRITE
1966 sv_force_normal_flags(lsv, 0);
1968 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
1971 else if (!SvOK(sv)) {
1975 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1977 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
1980 ulen = sv_len_utf8(lsv);
1990 else if (pos > (SSize_t)len)
1995 sv_pos_u2b(lsv, &p, 0);
1999 found->mg_len = pos;
2000 found->mg_flags &= ~MGf_MINMATCH;
2006 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2009 SV * const lsv = LvTARG(sv);
2010 const char * const tmps = SvPV_const(lsv,len);
2011 I32 offs = LvTARGOFF(sv);
2012 I32 rem = LvTARGLEN(sv);
2014 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2015 PERL_UNUSED_ARG(mg);
2018 sv_pos_u2b(lsv, &offs, &rem);
2019 if (offs > (I32)len)
2021 if (rem + offs > (I32)len)
2023 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2030 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2034 const char * const tmps = SvPV_const(sv, len);
2035 SV * const lsv = LvTARG(sv);
2036 I32 lvoff = LvTARGOFF(sv);
2037 I32 lvlen = LvTARGLEN(sv);
2039 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2040 PERL_UNUSED_ARG(mg);
2043 sv_utf8_upgrade(lsv);
2044 sv_pos_u2b(lsv, &lvoff, &lvlen);
2045 sv_insert(lsv, lvoff, lvlen, tmps, len);
2046 LvTARGLEN(sv) = sv_len_utf8(sv);
2049 else if (lsv && SvUTF8(lsv)) {
2051 sv_pos_u2b(lsv, &lvoff, &lvlen);
2052 LvTARGLEN(sv) = len;
2053 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2054 sv_insert(lsv, lvoff, lvlen, utf8, len);
2058 sv_insert(lsv, lvoff, lvlen, tmps, len);
2059 LvTARGLEN(sv) = len;
2067 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2071 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2072 PERL_UNUSED_ARG(sv);
2074 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2079 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2083 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2084 PERL_UNUSED_ARG(sv);
2086 /* update taint status */
2095 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2097 SV * const lsv = LvTARG(sv);
2099 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2100 PERL_UNUSED_ARG(mg);
2103 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2111 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2113 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2114 PERL_UNUSED_ARG(mg);
2115 do_vecset(sv); /* XXX slurp this routine */
2120 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2125 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2127 if (LvTARGLEN(sv)) {
2129 SV * const ahv = LvTARG(sv);
2130 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2135 AV *const av = MUTABLE_AV(LvTARG(sv));
2136 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2137 targ = AvARRAY(av)[LvTARGOFF(sv)];
2139 if (targ && (targ != &PL_sv_undef)) {
2140 /* somebody else defined it for us */
2141 SvREFCNT_dec(LvTARG(sv));
2142 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2144 SvREFCNT_dec(mg->mg_obj);
2146 mg->mg_flags &= ~MGf_REFCOUNTED;
2151 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2156 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2158 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2159 PERL_UNUSED_ARG(mg);
2163 sv_setsv(LvTARG(sv), sv);
2164 SvSETMAGIC(LvTARG(sv));
2170 Perl_vivify_defelem(pTHX_ SV *sv)
2176 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2178 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2181 SV * const ahv = LvTARG(sv);
2182 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2185 if (!value || value == &PL_sv_undef)
2186 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2189 AV *const av = MUTABLE_AV(LvTARG(sv));
2190 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2191 LvTARG(sv) = NULL; /* array can't be extended */
2193 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2194 if (!svp || (value = *svp) == &PL_sv_undef)
2195 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2198 SvREFCNT_inc_simple_void(value);
2199 SvREFCNT_dec(LvTARG(sv));
2202 SvREFCNT_dec(mg->mg_obj);
2204 mg->mg_flags &= ~MGf_REFCOUNTED;
2208 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2210 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2211 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2215 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2217 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2218 PERL_UNUSED_CONTEXT;
2225 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2227 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2229 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2231 if (uf && uf->uf_set)
2232 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2237 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2239 const char type = mg->mg_type;
2241 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2243 if (type == PERL_MAGIC_qr) {
2244 } else if (type == PERL_MAGIC_bm) {
2248 assert(type == PERL_MAGIC_fm);
2251 return sv_unmagic(sv, type);
2254 #ifdef USE_LOCALE_COLLATE
2256 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2258 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2261 * RenE<eacute> Descartes said "I think not."
2262 * and vanished with a faint plop.
2264 PERL_UNUSED_CONTEXT;
2265 PERL_UNUSED_ARG(sv);
2267 Safefree(mg->mg_ptr);
2273 #endif /* USE_LOCALE_COLLATE */
2275 /* Just clear the UTF-8 cache data. */
2277 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2279 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2280 PERL_UNUSED_CONTEXT;
2281 PERL_UNUSED_ARG(sv);
2282 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2284 mg->mg_len = -1; /* The mg_len holds the len cache. */
2289 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2292 register const char *s;
2294 register const REGEXP * rx;
2295 const char * const remaining = mg->mg_ptr + 1;
2299 PERL_ARGS_ASSERT_MAGIC_SET;
2301 switch (*mg->mg_ptr) {
2302 case '\015': /* $^MATCH */
2303 if (strEQ(remaining, "ATCH"))
2305 case '`': /* ${^PREMATCH} caught below */
2307 paren = RX_BUFF_IDX_PREMATCH;
2309 case '\'': /* ${^POSTMATCH} caught below */
2311 paren = RX_BUFF_IDX_POSTMATCH;
2315 paren = RX_BUFF_IDX_FULLMATCH;
2317 case '1': case '2': case '3': case '4':
2318 case '5': case '6': case '7': case '8': case '9':
2319 paren = atoi(mg->mg_ptr);
2321 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2322 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2325 /* Croak with a READONLY error when a numbered match var is
2326 * set without a previous pattern match. Unless it's C<local $1>
2328 if (!PL_localizing) {
2329 Perl_croak(aTHX_ "%s", PL_no_modify);
2332 case '\001': /* ^A */
2333 sv_setsv(PL_bodytarget, sv);
2335 case '\003': /* ^C */
2336 PL_minus_c = (bool)SvIV(sv);
2339 case '\004': /* ^D */
2341 s = SvPV_nolen_const(sv);
2342 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2343 if (DEBUG_x_TEST || DEBUG_B_TEST)
2344 dump_all_perl(!DEBUG_B_TEST);
2346 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2349 case '\005': /* ^E */
2350 if (*(mg->mg_ptr+1) == '\0') {
2352 set_vaxc_errno(SvIV(sv));
2355 SetLastError( SvIV(sv) );
2358 os2_setsyserrno(SvIV(sv));
2360 /* will anyone ever use this? */
2361 SETERRNO(SvIV(sv), 4);
2366 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2367 SvREFCNT_dec(PL_encoding);
2368 if (SvOK(sv) || SvGMAGICAL(sv)) {
2369 PL_encoding = newSVsv(sv);
2376 case '\006': /* ^F */
2377 PL_maxsysfd = SvIV(sv);
2379 case '\010': /* ^H */
2380 PL_hints = SvIV(sv);
2382 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2383 Safefree(PL_inplace);
2384 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2386 case '\017': /* ^O */
2387 if (*(mg->mg_ptr+1) == '\0') {
2388 Safefree(PL_osname);
2391 TAINT_PROPER("assigning to $^O");
2392 PL_osname = savesvpv(sv);
2395 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2397 const char *const start = SvPV(sv, len);
2398 const char *out = (const char*)memchr(start, '\0', len);
2402 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2403 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2405 /* Opening for input is more common than opening for output, so
2406 ensure that hints for input are sooner on linked list. */
2407 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2409 : newSVpvs_flags("", SvUTF8(sv));
2410 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2413 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2415 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2419 case '\020': /* ^P */
2420 if (*remaining == '\0') { /* ^P */
2421 PL_perldb = SvIV(sv);
2422 if (PL_perldb && !PL_DBsingle)
2425 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2427 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2430 case '\024': /* ^T */
2432 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2434 PL_basetime = (Time_t)SvIV(sv);
2437 case '\025': /* ^UTF8CACHE */
2438 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2439 PL_utf8cache = (signed char) sv_2iv(sv);
2442 case '\027': /* ^W & $^WARNING_BITS */
2443 if (*(mg->mg_ptr+1) == '\0') {
2444 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2446 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2447 | (i ? G_WARN_ON : G_WARN_OFF) ;
2450 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2451 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2452 if (!SvPOK(sv) && PL_localizing) {
2453 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2454 PL_compiling.cop_warnings = pWARN_NONE;
2459 int accumulate = 0 ;
2460 int any_fatals = 0 ;
2461 const char * const ptr = SvPV_const(sv, len) ;
2462 for (i = 0 ; i < len ; ++i) {
2463 accumulate |= ptr[i] ;
2464 any_fatals |= (ptr[i] & 0xAA) ;
2467 if (!specialWARN(PL_compiling.cop_warnings))
2468 PerlMemShared_free(PL_compiling.cop_warnings);
2469 PL_compiling.cop_warnings = pWARN_NONE;
2471 /* Yuck. I can't see how to abstract this: */
2472 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2473 WARN_ALL) && !any_fatals) {
2474 if (!specialWARN(PL_compiling.cop_warnings))
2475 PerlMemShared_free(PL_compiling.cop_warnings);
2476 PL_compiling.cop_warnings = pWARN_ALL;
2477 PL_dowarn |= G_WARN_ONCE ;
2481 const char *const p = SvPV_const(sv, len);
2483 PL_compiling.cop_warnings
2484 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2487 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2488 PL_dowarn |= G_WARN_ONCE ;
2496 if (PL_localizing) {
2497 if (PL_localizing == 1)
2498 SAVESPTR(PL_last_in_gv);
2500 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2501 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2504 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2505 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2506 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2509 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2510 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2511 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2514 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2517 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2518 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2519 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2522 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2526 IO * const io = GvIOp(PL_defoutgv);
2529 if ((SvIV(sv)) == 0)
2530 IoFLAGS(io) &= ~IOf_FLUSH;
2532 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2533 PerlIO *ofp = IoOFP(io);
2535 (void)PerlIO_flush(ofp);
2536 IoFLAGS(io) |= IOf_FLUSH;
2542 SvREFCNT_dec(PL_rs);
2543 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 SvUPGRADE(sv, SVt_PVLV);
2561 PL_statusvalue = LvTARGOFF(sv);
2562 PL_statusvalue_vms = LvTARGLEN(sv);
2566 #ifdef VMSISH_STATUS
2568 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2571 STATUS_UNIX_EXIT_SET(SvIV(sv));
2576 # define PERL_VMS_BANG vaxc$errno
2578 # define PERL_VMS_BANG 0
2580 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2581 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2586 if (PL_delaymagic) {
2587 PL_delaymagic |= DM_RUID;
2588 break; /* don't do magic till later */
2591 (void)setruid((Uid_t)PL_uid);
2594 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2596 #ifdef HAS_SETRESUID
2597 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2599 if (PL_uid == PL_euid) { /* special case $< = $> */
2601 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2602 if (PL_uid != 0 && PerlProc_getuid() == 0)
2603 (void)PerlProc_setuid(0);
2605 (void)PerlProc_setuid(PL_uid);
2607 PL_uid = PerlProc_getuid();
2608 Perl_croak(aTHX_ "setruid() not implemented");
2613 PL_uid = PerlProc_getuid();
2614 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2618 if (PL_delaymagic) {
2619 PL_delaymagic |= DM_EUID;
2620 break; /* don't do magic till later */
2623 (void)seteuid((Uid_t)PL_euid);
2626 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2628 #ifdef HAS_SETRESUID
2629 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2631 if (PL_euid == PL_uid) /* special case $> = $< */
2632 PerlProc_setuid(PL_euid);
2634 PL_euid = PerlProc_geteuid();
2635 Perl_croak(aTHX_ "seteuid() not implemented");
2640 PL_euid = PerlProc_geteuid();
2641 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2645 if (PL_delaymagic) {
2646 PL_delaymagic |= DM_RGID;
2647 break; /* don't do magic till later */
2650 (void)setrgid((Gid_t)PL_gid);
2653 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2655 #ifdef HAS_SETRESGID
2656 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2658 if (PL_gid == PL_egid) /* special case $( = $) */
2659 (void)PerlProc_setgid(PL_gid);
2661 PL_gid = PerlProc_getgid();
2662 Perl_croak(aTHX_ "setrgid() not implemented");
2667 PL_gid = PerlProc_getgid();
2668 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2671 #ifdef HAS_SETGROUPS
2673 const char *p = SvPV_const(sv, len);
2674 Groups_t *gary = NULL;
2675 #ifdef _SC_NGROUPS_MAX
2676 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2681 int maxgrp = NGROUPS;
2687 for (i = 0; i < maxgrp; ++i) {
2688 while (*p && !isSPACE(*p))
2695 Newx(gary, i + 1, Groups_t);
2697 Renew(gary, i + 1, Groups_t);
2701 (void)setgroups(i, gary);
2704 #else /* HAS_SETGROUPS */
2706 #endif /* HAS_SETGROUPS */
2707 if (PL_delaymagic) {
2708 PL_delaymagic |= DM_EGID;
2709 break; /* don't do magic till later */
2712 (void)setegid((Gid_t)PL_egid);
2715 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2717 #ifdef HAS_SETRESGID
2718 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2720 if (PL_egid == PL_gid) /* special case $) = $( */
2721 (void)PerlProc_setgid(PL_egid);
2723 PL_egid = PerlProc_getegid();
2724 Perl_croak(aTHX_ "setegid() not implemented");
2729 PL_egid = PerlProc_getegid();
2730 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2733 PL_chopset = SvPV_force(sv,len);
2736 LOCK_DOLLARZERO_MUTEX;
2737 #ifdef HAS_SETPROCTITLE
2738 /* The BSDs don't show the argv[] in ps(1) output, they
2739 * show a string from the process struct and provide
2740 * the setproctitle() routine to manipulate that. */
2741 if (PL_origalen != 1) {
2742 s = SvPV_const(sv, len);
2743 # if __FreeBSD_version > 410001
2744 /* The leading "-" removes the "perl: " prefix,
2745 * but not the "(perl) suffix from the ps(1)
2746 * output, because that's what ps(1) shows if the
2747 * argv[] is modified. */
2748 setproctitle("-%s", s);
2749 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2750 /* This doesn't really work if you assume that
2751 * $0 = 'foobar'; will wipe out 'perl' from the $0
2752 * because in ps(1) output the result will be like
2753 * sprintf("perl: %s (perl)", s)
2754 * I guess this is a security feature:
2755 * one (a user process) cannot get rid of the original name.
2757 setproctitle("%s", s);
2760 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2761 if (PL_origalen != 1) {
2763 s = SvPV_const(sv, len);
2764 un.pst_command = (char *)s;
2765 pstat(PSTAT_SETCMD, un, len, 0, 0);
2768 if (PL_origalen > 1) {
2769 /* PL_origalen is set in perl_parse(). */
2770 s = SvPV_force(sv,len);
2771 if (len >= (STRLEN)PL_origalen-1) {
2772 /* Longer than original, will be truncated. We assume that
2773 * PL_origalen bytes are available. */
2774 Copy(s, PL_origargv[0], PL_origalen-1, char);
2777 /* Shorter than original, will be padded. */
2779 /* Special case for Mac OS X: see [perl #38868] */
2782 /* Is the space counterintuitive? Yes.
2783 * (You were expecting \0?)
2784 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2786 const int pad = ' ';
2788 Copy(s, PL_origargv[0], len, char);
2789 PL_origargv[0][len] = 0;
2790 memset(PL_origargv[0] + len + 1,
2791 pad, PL_origalen - len - 1);
2793 PL_origargv[0][PL_origalen-1] = 0;
2794 for (i = 1; i < PL_origargc; i++)
2798 UNLOCK_DOLLARZERO_MUTEX;
2805 Perl_whichsig(pTHX_ const char *sig)
2807 register char* const* sigv;
2809 PERL_ARGS_ASSERT_WHICHSIG;
2810 PERL_UNUSED_CONTEXT;
2812 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2813 if (strEQ(sig,*sigv))
2814 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2816 if (strEQ(sig,"CHLD"))
2820 if (strEQ(sig,"CLD"))
2827 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2828 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2830 Perl_sighandler(int sig)
2833 #ifdef PERL_GET_SIG_CONTEXT
2834 dTHXa(PERL_GET_SIG_CONTEXT);
2841 SV * const tSv = PL_Sv;
2845 XPV * const tXpv = PL_Xpv;
2847 if (PL_savestack_ix + 15 <= PL_savestack_max)
2849 if (PL_markstack_ptr < PL_markstack_max - 2)
2851 if (PL_scopestack_ix < PL_scopestack_max - 3)
2854 if (!PL_psig_ptr[sig]) {
2855 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2860 /* Max number of items pushed there is 3*n or 4. We cannot fix
2861 infinity, so we fix 4 (in fact 5): */
2863 PL_savestack_ix += 5; /* Protect save in progress. */
2864 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2867 PL_markstack_ptr++; /* Protect mark. */
2869 PL_scopestack_ix += 1;
2870 /* sv_2cv is too complicated, try a simpler variant first: */
2871 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
2872 || SvTYPE(cv) != SVt_PVCV) {
2874 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2877 if (!cv || !CvROOT(cv)) {
2878 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2879 PL_sig_name[sig], (gv ? GvENAME(gv)
2886 if(PL_psig_name[sig]) {
2887 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2889 #if !defined(PERL_IMPLICIT_CONTEXT)
2893 sv = sv_newmortal();
2894 sv_setpv(sv,PL_sig_name[sig]);
2897 PUSHSTACKi(PERLSI_SIGNAL);
2900 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2902 struct sigaction oact;
2904 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2907 SV *rv = newRV_noinc(MUTABLE_SV(sih));
2908 /* The siginfo fields signo, code, errno, pid, uid,
2909 * addr, status, and band are defined by POSIX/SUSv3. */
2910 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2911 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2912 #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. */
2913 hv_stores(sih, "errno", newSViv(sip->si_errno));
2914 hv_stores(sih, "status", newSViv(sip->si_status));
2915 hv_stores(sih, "uid", newSViv(sip->si_uid));
2916 hv_stores(sih, "pid", newSViv(sip->si_pid));
2917 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2918 hv_stores(sih, "band", newSViv(sip->si_band));
2922 mPUSHp((char *)sip, sizeof(*sip));
2930 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
2933 if (SvTRUE(ERRSV)) {
2935 #ifdef HAS_SIGPROCMASK
2936 /* Handler "died", for example to get out of a restart-able read().
2937 * Before we re-do that on its behalf re-enable the signal which was
2938 * blocked by the system when we entered.
2942 sigaddset(&set,sig);
2943 sigprocmask(SIG_UNBLOCK, &set, NULL);
2945 /* Not clear if this will work */
2946 (void)rsignal(sig, SIG_IGN);
2947 (void)rsignal(sig, PL_csighandlerp);
2949 #endif /* !PERL_MICRO */
2950 Perl_die(aTHX_ NULL);
2954 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2958 PL_scopestack_ix -= 1;
2961 PL_op = myop; /* Apparently not needed... */
2963 PL_Sv = tSv; /* Restore global temporaries. */
2970 S_restore_magic(pTHX_ const void *p)
2973 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2974 SV* const sv = mgs->mgs_sv;
2979 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2981 #ifdef PERL_OLD_COPY_ON_WRITE
2982 /* While magic was saved (and off) sv_setsv may well have seen
2983 this SV as a prime candidate for COW. */
2985 sv_force_normal_flags(sv, 0);
2988 if (mgs->mgs_readonly)
2990 if (mgs->mgs_magical)
2991 SvFLAGS(sv) |= mgs->mgs_magical;
2994 if (SvGMAGICAL(sv)) {
2995 /* downgrade public flags to private,
2996 and discard any other private flags */
2998 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3000 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3001 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3006 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3008 /* If we're still on top of the stack, pop us off. (That condition
3009 * will be satisfied if restore_magic was called explicitly, but *not*
3010 * if it's being called via leave_scope.)
3011 * The reason for doing this is that otherwise, things like sv_2cv()
3012 * may leave alloc gunk on the savestack, and some code
3013 * (e.g. sighandler) doesn't expect that...
3015 if (PL_savestack_ix == mgs->mgs_ss_ix)
3017 I32 popval = SSPOPINT;
3018 assert(popval == SAVEt_DESTRUCTOR_X);
3019 PL_savestack_ix -= 2;
3021 assert(popval == SAVEt_ALLOC);
3023 PL_savestack_ix -= popval;
3029 S_unwind_handler_stack(pTHX_ const void *p)
3032 const U32 flags = *(const U32*)p;
3034 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3037 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3038 #if !defined(PERL_IMPLICIT_CONTEXT)
3040 SvREFCNT_dec(PL_sig_sv);
3045 =for apidoc magic_sethint
3047 Triggered by a store to %^H, records the key/value pair to
3048 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3049 anything that would need a deep copy. Maybe we should warn if we find a
3055 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3058 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3059 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3061 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3063 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3064 an alternative leaf in there, with PL_compiling.cop_hints being used if
3065 it's NULL. If needed for threads, the alternative could lock a mutex,
3066 or take other more complex action. */
3068 /* Something changed in %^H, so it will need to be restored on scope exit.
3069 Doing this here saves a lot of doing it manually in perl code (and
3070 forgetting to do it, and consequent subtle errors. */
3071 PL_hints |= HINT_LOCALIZE_HH;
3072 PL_compiling.cop_hints_hash
3073 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3078 =for apidoc magic_clearhint
3080 Triggered by a delete from %^H, records the key to
3081 C<PL_compiling.cop_hints_hash>.
3086 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3090 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3091 PERL_UNUSED_ARG(sv);
3093 assert(mg->mg_len == HEf_SVKEY);
3095 PERL_UNUSED_ARG(sv);
3097 PL_hints |= HINT_LOCALIZE_HH;
3098 PL_compiling.cop_hints_hash
3099 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3100 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
3105 =for apidoc magic_clearhints
3107 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3112 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3114 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3115 PERL_UNUSED_ARG(sv);
3116 PERL_UNUSED_ARG(mg);
3117 if (PL_compiling.cop_hints_hash) {
3118 Perl_refcounted_he_free(aTHX_ PL_compiling.cop_hints_hash);
3119 PL_compiling.cop_hints_hash = NULL;
3126 * c-indentation-style: bsd
3128 * indent-tabs-mode: t
3131 * ex: set ts=8 sts=4 sw=4 noet: