3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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."
17 =head1 Magical Functions
19 "Magic" is special data attached to SV structures in order to give them
20 "magical" properties. When any Perl code tries to read from, or assign to,
21 an SV marked as magical, it calls the 'get' or 'set' function associated
22 with that SV's magic. A get is called prior to reading an SV, in order to
23 give it a chance to update its internal value (get on $. writes the line
24 number of the last read filehandle into to the SV's IV slot), while
25 set is called after an SV has been written to, in order to allow it to make
26 use of its changed value (set on $/ copies the SV's new value to the
27 PL_rs global variable).
29 Magic is implemented as a linked list of MAGIC structures attached to the
30 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
31 of functions that implement the get(), set(), length() etc functions,
32 plus space for some flags and pointers. For example, a tied variable has
33 a MAGIC structure that contains a pointer to the object associated with the
42 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
48 #if defined(HAS_SETGROUPS)
55 # include <sys/pstat.h>
58 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
59 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
61 Signal_t Perl_csighandler(int sig);
65 /* Missing protos on LynxOS */
66 void setruid(uid_t id);
67 void seteuid(uid_t id);
68 void setrgid(uid_t id);
69 void setegid(uid_t id);
73 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
81 /* MGS is typedef'ed to struct magic_state in perl.h */
84 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
89 PERL_ARGS_ASSERT_SAVE_MAGIC;
91 assert(SvMAGICAL(sv));
92 /* Turning READONLY off for a copy-on-write scalar (including shared
93 hash keys) is a bad idea. */
95 sv_force_normal_flags(sv, 0);
97 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
99 mgs = SSPTR(mgs_ix, MGS*);
101 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
102 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
106 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
107 /* No public flags are set, so promote any private flags to public. */
108 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
113 =for apidoc mg_magical
115 Turns on the magical status of an SV. See C<sv_magic>.
121 Perl_mg_magical(pTHX_ SV *sv)
124 PERL_ARGS_ASSERT_MG_MAGICAL;
126 if ((mg = SvMAGIC(sv))) {
129 const MGVTBL* const vtbl = mg->mg_virtual;
131 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
138 } while ((mg = mg->mg_moremagic));
139 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
145 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
148 S_is_container_magic(const MAGIC *mg)
151 switch (mg->mg_type) {
154 case PERL_MAGIC_regex_global:
155 case PERL_MAGIC_nkeys:
156 #ifdef USE_LOCALE_COLLATE
157 case PERL_MAGIC_collxfrm:
160 case PERL_MAGIC_taint:
162 case PERL_MAGIC_vstring:
163 case PERL_MAGIC_utf8:
164 case PERL_MAGIC_substr:
165 case PERL_MAGIC_defelem:
166 case PERL_MAGIC_arylen:
168 case PERL_MAGIC_backref:
169 case PERL_MAGIC_arylen_p:
170 case PERL_MAGIC_rhash:
171 case PERL_MAGIC_symtab:
181 Do magic after a value is retrieved from the SV. See C<sv_magic>.
187 Perl_mg_get(pTHX_ SV *sv)
190 const I32 mgs_ix = SSNEW(sizeof(MGS));
191 const bool was_temp = (bool)SvTEMP(sv);
193 MAGIC *newmg, *head, *cur, *mg;
194 /* guard against sv having being freed midway by holding a private
197 PERL_ARGS_ASSERT_MG_GET;
199 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
200 cause the SV's buffer to get stolen (and maybe other stuff).
203 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
208 save_magic(mgs_ix, sv);
210 /* We must call svt_get(sv, mg) for each valid entry in the linked
211 list of magic. svt_get() may delete the current entry, add new
212 magic to the head of the list, or upgrade the SV. AMS 20010810 */
214 newmg = cur = head = mg = SvMAGIC(sv);
216 const MGVTBL * const vtbl = mg->mg_virtual;
218 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
219 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
221 /* guard against magic having been deleted - eg FETCH calling
226 /* Don't restore the flags for this entry if it was deleted. */
227 if (mg->mg_flags & MGf_GSKIP)
228 (SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
231 mg = mg->mg_moremagic;
234 /* Have we finished with the new entries we saw? Start again
235 where we left off (unless there are more new entries). */
243 /* Were any new entries added? */
244 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
251 restore_magic(INT2PTR(void *, (IV)mgs_ix));
253 if (SvREFCNT(sv) == 1) {
254 /* We hold the last reference to this SV, which implies that the
255 SV was deleted as a side effect of the routines we called. */
264 Do magic after a value is assigned to the SV. See C<sv_magic>.
270 Perl_mg_set(pTHX_ SV *sv)
273 const I32 mgs_ix = SSNEW(sizeof(MGS));
277 PERL_ARGS_ASSERT_MG_SET;
279 save_magic(mgs_ix, sv);
281 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
282 const MGVTBL* vtbl = mg->mg_virtual;
283 nextmg = mg->mg_moremagic; /* it may delete itself */
284 if (mg->mg_flags & MGf_GSKIP) {
285 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
286 (SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
288 if (PL_localizing == 2 && !S_is_container_magic(mg))
290 if (vtbl && vtbl->svt_set)
291 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
294 restore_magic(INT2PTR(void*, (IV)mgs_ix));
299 =for apidoc mg_length
301 Report on the SV's length. See C<sv_magic>.
307 Perl_mg_length(pTHX_ SV *sv)
313 PERL_ARGS_ASSERT_MG_LENGTH;
315 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
316 const MGVTBL * const vtbl = mg->mg_virtual;
317 if (vtbl && vtbl->svt_len) {
318 const I32 mgs_ix = SSNEW(sizeof(MGS));
319 save_magic(mgs_ix, sv);
320 /* omit MGf_GSKIP -- not changed here */
321 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
322 restore_magic(INT2PTR(void*, (IV)mgs_ix));
328 /* You can't know whether it's UTF-8 until you get the string again...
330 const U8 *s = (U8*)SvPV_const(sv, len);
333 len = utf8_length(s, s + len);
340 Perl_mg_size(pTHX_ SV *sv)
344 PERL_ARGS_ASSERT_MG_SIZE;
346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
347 const MGVTBL* const vtbl = mg->mg_virtual;
348 if (vtbl && vtbl->svt_len) {
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
351 save_magic(mgs_ix, sv);
352 /* omit MGf_GSKIP -- not changed here */
353 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
361 return AvFILLp((AV *) sv); /* Fallback to non-tied array */
365 Perl_croak(aTHX_ "Size magic not implemented");
374 Clear something magical that the SV represents. See C<sv_magic>.
380 Perl_mg_clear(pTHX_ SV *sv)
382 const I32 mgs_ix = SSNEW(sizeof(MGS));
385 PERL_ARGS_ASSERT_MG_CLEAR;
387 save_magic(mgs_ix, sv);
389 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
390 const MGVTBL* const vtbl = mg->mg_virtual;
391 /* omit GSKIP -- never set here */
393 if (vtbl && vtbl->svt_clear)
394 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
397 restore_magic(INT2PTR(void*, (IV)mgs_ix));
404 Finds the magic pointer for type matching the SV. See C<sv_magic>.
410 Perl_mg_find(pTHX_ const SV *sv, int type)
415 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
416 if (mg->mg_type == type)
426 Copies the magic from one SV to another. See C<sv_magic>.
432 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
437 PERL_ARGS_ASSERT_MG_COPY;
439 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
440 const MGVTBL* const vtbl = mg->mg_virtual;
441 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
442 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
445 const char type = mg->mg_type;
446 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
448 (type == PERL_MAGIC_tied)
450 : (type == PERL_MAGIC_regdata && mg->mg_obj)
453 toLOWER(type), key, klen);
462 =for apidoc mg_localize
464 Copy some of the magic from an existing SV to new localized version of
465 that SV. Container magic (eg %ENV, $1, tie) gets copied, value magic
466 doesn't (eg taint, pos).
472 Perl_mg_localize(pTHX_ SV *sv, SV *nsv)
477 PERL_ARGS_ASSERT_MG_LOCALIZE;
479 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
480 const MGVTBL* const vtbl = mg->mg_virtual;
481 if (!S_is_container_magic(mg))
484 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
485 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
487 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
488 mg->mg_ptr, mg->mg_len);
490 /* container types should remain read-only across localization */
491 SvFLAGS(nsv) |= SvREADONLY(sv);
494 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
495 SvFLAGS(nsv) |= SvMAGICAL(sv);
505 Free any magic storage used by the SV. See C<sv_magic>.
511 Perl_mg_free(pTHX_ SV *sv)
516 PERL_ARGS_ASSERT_MG_FREE;
518 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
519 const MGVTBL* const vtbl = mg->mg_virtual;
520 moremagic = mg->mg_moremagic;
521 if (vtbl && vtbl->svt_free)
522 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
523 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
524 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
525 Safefree(mg->mg_ptr);
526 else if (mg->mg_len == HEf_SVKEY)
527 SvREFCNT_dec((SV*)mg->mg_ptr);
529 if (mg->mg_flags & MGf_REFCOUNTED)
530 SvREFCNT_dec(mg->mg_obj);
532 SvMAGIC_set(sv, moremagic);
534 SvMAGIC_set(sv, NULL);
541 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
546 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
549 register const REGEXP * const rx = PM_GETRE(PL_curpm);
551 if (mg->mg_obj) { /* @+ */
552 /* return the number possible */
553 return RX_NPARENS(rx);
555 I32 paren = RX_LASTPAREN(rx);
557 /* return the last filled */
559 && (RX_OFFS(rx)[paren].start == -1
560 || RX_OFFS(rx)[paren].end == -1) )
571 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
575 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
578 register const REGEXP * const rx = PM_GETRE(PL_curpm);
580 register const I32 paren = mg->mg_len;
585 if (paren <= (I32)RX_NPARENS(rx) &&
586 (s = RX_OFFS(rx)[paren].start) != -1 &&
587 (t = RX_OFFS(rx)[paren].end) != -1)
590 if (mg->mg_obj) /* @+ */
595 if (i > 0 && RX_MATCH_UTF8(rx)) {
596 const char * const b = RX_SUBBEG(rx);
598 i = utf8_length((U8*)b, (U8*)(b+i));
609 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
611 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
614 Perl_croak(aTHX_ PL_no_modify);
615 NORETURN_FUNCTION_END;
619 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
624 register const REGEXP * rx;
625 const char * const remaining = mg->mg_ptr + 1;
627 PERL_ARGS_ASSERT_MAGIC_LEN;
629 switch (*mg->mg_ptr) {
631 if (*remaining == '\0') { /* ^P */
633 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
635 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
639 case '\015': /* $^MATCH */
640 if (strEQ(remaining, "ATCH")) {
647 paren = RX_BUFF_IDX_PREMATCH;
651 paren = RX_BUFF_IDX_POSTMATCH;
655 paren = RX_BUFF_IDX_FULLMATCH;
657 case '1': case '2': case '3': case '4':
658 case '5': case '6': case '7': case '8': case '9':
659 paren = atoi(mg->mg_ptr);
661 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
663 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
666 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
669 if (ckWARN(WARN_UNINITIALIZED))
674 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
675 paren = RX_LASTPAREN(rx);
680 case '\016': /* ^N */
681 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
682 paren = RX_LASTCLOSEPAREN(rx);
689 if (!SvPOK(sv) && SvNIOK(sv)) {
697 #define SvRTRIM(sv) STMT_START { \
699 STRLEN len = SvCUR(sv); \
700 char * const p = SvPVX(sv); \
701 while (len > 0 && isSPACE(p[len-1])) \
703 SvCUR_set(sv, len); \
709 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
711 PERL_ARGS_ASSERT_EMULATE_COP_IO;
713 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
714 sv_setsv(sv, &PL_sv_undef);
718 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
719 SV *const value = Perl_refcounted_he_fetch(aTHX_
721 0, "open<", 5, 0, 0);
726 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
727 SV *const value = Perl_refcounted_he_fetch(aTHX_
729 0, "open>", 5, 0, 0);
737 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
741 register char *s = NULL;
743 const char * const remaining = mg->mg_ptr + 1;
744 const char nextchar = *remaining;
746 PERL_ARGS_ASSERT_MAGIC_GET;
748 switch (*mg->mg_ptr) {
749 case '\001': /* ^A */
750 sv_setsv(sv, PL_bodytarget);
752 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
753 if (nextchar == '\0') {
754 sv_setiv(sv, (IV)PL_minus_c);
756 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
757 sv_setiv(sv, (IV)STATUS_NATIVE);
761 case '\004': /* ^D */
762 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
764 case '\005': /* ^E */
765 if (nextchar == '\0') {
766 #if defined(MACOS_TRADITIONAL)
770 sv_setnv(sv,(double)gMacPerl_OSErr);
771 sv_setpv(sv, gMacPerl_OSErr ? GetSysErrText(gMacPerl_OSErr, msg) : "");
775 # include <descrip.h>
776 # include <starlet.h>
778 $DESCRIPTOR(msgdsc,msg);
779 sv_setnv(sv,(NV) vaxc$errno);
780 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
781 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
786 if (!(_emx_env & 0x200)) { /* Under DOS */
787 sv_setnv(sv, (NV)errno);
788 sv_setpv(sv, errno ? Strerror(errno) : "");
790 if (errno != errno_isOS2) {
791 const int tmp = _syserrno();
792 if (tmp) /* 2nd call to _syserrno() makes it 0 */
795 sv_setnv(sv, (NV)Perl_rc);
796 sv_setpv(sv, os2error(Perl_rc));
800 const DWORD dwErr = GetLastError();
801 sv_setnv(sv, (NV)dwErr);
803 PerlProc_GetOSError(sv, dwErr);
806 sv_setpvn(sv, "", 0);
811 const int saveerrno = errno;
812 sv_setnv(sv, (NV)errno);
813 sv_setpv(sv, errno ? Strerror(errno) : "");
818 SvNOK_on(sv); /* what a wonderful hack! */
820 else if (strEQ(remaining, "NCODING"))
821 sv_setsv(sv, PL_encoding);
823 case '\006': /* ^F */
824 sv_setiv(sv, (IV)PL_maxsysfd);
826 case '\010': /* ^H */
827 sv_setiv(sv, (IV)PL_hints);
829 case '\011': /* ^I */ /* NOT \t in EBCDIC */
830 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
832 case '\017': /* ^O & ^OPEN */
833 if (nextchar == '\0') {
834 sv_setpv(sv, PL_osname);
837 else if (strEQ(remaining, "PEN")) {
838 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
842 if (nextchar == '\0') { /* ^P */
843 sv_setiv(sv, (IV)PL_perldb);
844 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
845 goto do_prematch_fetch;
846 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
847 goto do_postmatch_fetch;
850 case '\023': /* ^S */
851 if (nextchar == '\0') {
852 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
855 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
860 case '\024': /* ^T */
861 if (nextchar == '\0') {
863 sv_setnv(sv, PL_basetime);
865 sv_setiv(sv, (IV)PL_basetime);
868 else if (strEQ(remaining, "AINT"))
869 sv_setiv(sv, PL_tainting
870 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
873 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
874 if (strEQ(remaining, "NICODE"))
875 sv_setuv(sv, (UV) PL_unicode);
876 else if (strEQ(remaining, "TF8LOCALE"))
877 sv_setuv(sv, (UV) PL_utf8locale);
878 else if (strEQ(remaining, "TF8CACHE"))
879 sv_setiv(sv, (IV) PL_utf8cache);
881 case '\027': /* ^W & $^WARNING_BITS */
882 if (nextchar == '\0')
883 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
884 else if (strEQ(remaining, "ARNING_BITS")) {
885 if (PL_compiling.cop_warnings == pWARN_NONE) {
886 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
888 else if (PL_compiling.cop_warnings == pWARN_STD) {
891 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
895 else if (PL_compiling.cop_warnings == pWARN_ALL) {
896 /* Get the bit mask for $warnings::Bits{all}, because
897 * it could have been extended by warnings::register */
898 HV * const bits=get_hv("warnings::Bits", FALSE);
900 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
902 sv_setsv(sv, *bits_all);
905 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
909 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
910 *PL_compiling.cop_warnings);
915 case '\015': /* $^MATCH */
916 if (strEQ(remaining, "ATCH")) {
917 case '1': case '2': case '3': case '4':
918 case '5': case '6': case '7': case '8': case '9': case '&':
919 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
921 * Pre-threads, this was paren = atoi(GvENAME((GV*)mg->mg_obj));
922 * XXX Does the new way break anything?
924 paren = atoi(mg->mg_ptr); /* $& is in [0] */
925 CALLREG_NUMBUF_FETCH(rx,paren,sv);
928 sv_setsv(sv,&PL_sv_undef);
932 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
933 if (RX_LASTPAREN(rx)) {
934 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
938 sv_setsv(sv,&PL_sv_undef);
940 case '\016': /* ^N */
941 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
942 if (RX_LASTCLOSEPAREN(rx)) {
943 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
948 sv_setsv(sv,&PL_sv_undef);
952 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
953 CALLREG_NUMBUF_FETCH(rx,-2,sv);
956 sv_setsv(sv,&PL_sv_undef);
960 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
961 CALLREG_NUMBUF_FETCH(rx,-1,sv);
964 sv_setsv(sv,&PL_sv_undef);
967 if (GvIO(PL_last_in_gv)) {
968 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
973 sv_setiv(sv, (IV)STATUS_CURRENT);
974 #ifdef COMPLEX_STATUS
975 LvTARGOFF(sv) = PL_statusvalue;
976 LvTARGLEN(sv) = PL_statusvalue_vms;
981 if (GvIOp(PL_defoutgv))
982 s = IoTOP_NAME(GvIOp(PL_defoutgv));
986 sv_setpv(sv,GvENAME(PL_defoutgv));
987 sv_catpvs(sv,"_TOP");
991 if (GvIOp(PL_defoutgv))
992 s = IoFMT_NAME(GvIOp(PL_defoutgv));
994 s = GvENAME(PL_defoutgv);
998 if (GvIOp(PL_defoutgv))
999 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1002 if (GvIOp(PL_defoutgv))
1003 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1006 if (GvIOp(PL_defoutgv))
1007 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1014 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1017 if (GvIOp(PL_defoutgv))
1018 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1024 sv_copypv(sv, PL_ors_sv);
1028 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1029 sv_setpv(sv, errno ? Strerror(errno) : "");
1032 const int saveerrno = errno;
1033 sv_setnv(sv, (NV)errno);
1035 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1036 sv_setpv(sv, os2error(Perl_rc));
1039 sv_setpv(sv, errno ? Strerror(errno) : "");
1044 SvNOK_on(sv); /* what a wonderful hack! */
1047 sv_setiv(sv, (IV)PL_uid);
1050 sv_setiv(sv, (IV)PL_euid);
1053 sv_setiv(sv, (IV)PL_gid);
1056 sv_setiv(sv, (IV)PL_egid);
1058 #ifdef HAS_GETGROUPS
1060 Groups_t *gary = NULL;
1061 I32 i, num_groups = getgroups(0, gary);
1062 Newx(gary, num_groups, Groups_t);
1063 num_groups = getgroups(num_groups, gary);
1064 for (i = 0; i < num_groups; i++)
1065 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1068 (void)SvIOK_on(sv); /* what a wonderful hack! */
1071 #ifndef MACOS_TRADITIONAL
1080 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1082 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1084 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1086 if (uf && uf->uf_val)
1087 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1092 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1095 STRLEN len = 0, klen;
1096 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1097 const char * const ptr = MgPV_const(mg,klen);
1100 PERL_ARGS_ASSERT_MAGIC_SETENV;
1102 #ifdef DYNAMIC_ENV_FETCH
1103 /* We just undefd an environment var. Is a replacement */
1104 /* waiting in the wings? */
1106 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1108 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1112 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1113 /* And you'll never guess what the dog had */
1114 /* in its mouth... */
1116 MgTAINTEDDIR_off(mg);
1118 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1119 char pathbuf[256], eltbuf[256], *cp, *elt;
1123 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1125 do { /* DCL$PATH may be a search list */
1126 while (1) { /* as may dev portion of any element */
1127 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1128 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1129 cando_by_name(S_IWUSR,0,elt) ) {
1130 MgTAINTEDDIR_on(mg);
1134 if ((cp = strchr(elt, ':')) != NULL)
1136 if (my_trnlnm(elt, eltbuf, j++))
1142 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1145 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1146 const char * const strend = s + len;
1148 while (s < strend) {
1152 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1153 const char path_sep = '|';
1155 const char path_sep = ':';
1157 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1158 s, strend, path_sep, &i);
1160 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1162 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1164 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1166 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1167 MgTAINTEDDIR_on(mg);
1173 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1179 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1181 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1182 PERL_UNUSED_ARG(sv);
1183 my_setenv(MgPV_nolen_const(mg),NULL);
1188 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1191 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1192 PERL_UNUSED_ARG(mg);
1194 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1196 if (PL_localizing) {
1199 hv_iterinit((HV*)sv);
1200 while ((entry = hv_iternext((HV*)sv))) {
1202 my_setenv(hv_iterkey(entry, &keylen),
1203 SvPV_nolen_const(hv_iterval((HV*)sv, entry)));
1211 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1214 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1215 PERL_UNUSED_ARG(sv);
1216 PERL_UNUSED_ARG(mg);
1218 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1226 #ifdef HAS_SIGPROCMASK
1228 restore_sigmask(pTHX_ SV *save_sv)
1230 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1231 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1235 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1238 /* Are we fetching a signal entry? */
1239 const I32 i = whichsig(MgPV_nolen_const(mg));
1241 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1245 sv_setsv(sv,PL_psig_ptr[i]);
1247 Sighandler_t sigstate = rsignal_state(i);
1248 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1249 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1252 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1253 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1256 /* cache state so we don't fetch it again */
1257 if(sigstate == (Sighandler_t) SIG_IGN)
1258 sv_setpvs(sv,"IGNORE");
1260 sv_setsv(sv,&PL_sv_undef);
1261 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1268 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1270 /* XXX Some of this code was copied from Perl_magic_setsig. A little
1271 * refactoring might be in order.
1274 register const char * const s = MgPV_nolen_const(mg);
1275 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1276 PERL_UNUSED_ARG(sv);
1279 if (strEQ(s,"__DIE__"))
1281 else if (strEQ(s,"__WARN__") && PL_warnhook != PERL_WARNHOOK_FATAL)
1284 SV *const to_dec = *svp;
1286 SvREFCNT_dec(to_dec);
1290 /* Are we clearing a signal entry? */
1291 const I32 i = whichsig(s);
1293 #ifdef HAS_SIGPROCMASK
1296 /* Avoid having the signal arrive at a bad time, if possible. */
1299 sigprocmask(SIG_BLOCK, &set, &save);
1301 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1302 SAVEFREESV(save_sv);
1303 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1306 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1307 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1309 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1310 PL_sig_defaulting[i] = 1;
1311 (void)rsignal(i, PL_csighandlerp);
1313 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1315 if(PL_psig_name[i]) {
1316 SvREFCNT_dec(PL_psig_name[i]);
1319 if(PL_psig_ptr[i]) {
1320 SV * const to_dec=PL_psig_ptr[i];
1323 SvREFCNT_dec(to_dec);
1333 * The signal handling nomenclature has gotten a bit confusing since the advent of
1334 * safe signals. S_raise_signal only raises signals by analogy with what the
1335 * underlying system's signal mechanism does. It might be more proper to say that
1336 * it defers signals that have already been raised and caught.
1338 * PL_sig_pending and PL_psig_pend likewise do not track signals that are pending
1339 * in the sense of being on the system's signal queue in between raising and delivery.
1340 * They are only pending on Perl's deferral list, i.e., they track deferred signals
1341 * awaiting delivery after the current Perl opcode completes and say nothing about
1342 * signals raised but not yet caught in the underlying signal implementation.
1345 #ifndef SIG_PENDING_DIE_COUNT
1346 # define SIG_PENDING_DIE_COUNT 120
1350 S_raise_signal(pTHX_ int sig)
1353 /* Set a flag to say this signal is pending */
1354 PL_psig_pend[sig]++;
1355 /* And one to say _a_ signal is pending */
1356 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1357 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1358 (unsigned long)SIG_PENDING_DIE_COUNT);
1362 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1363 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1365 Perl_csighandler(int sig)
1368 #ifdef PERL_GET_SIG_CONTEXT
1369 dTHXa(PERL_GET_SIG_CONTEXT);
1373 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1375 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1376 (void) rsignal(sig, PL_csighandlerp);
1377 if (PL_sig_ignoring[sig]) return;
1379 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1380 if (PL_sig_defaulting[sig])
1381 #ifdef KILL_BY_SIGPRC
1382 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1387 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1399 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1400 /* Call the perl level handler now--
1401 * with risk we may be in malloc() etc. */
1402 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1403 (*PL_sighandlerp)(sig, NULL, NULL);
1405 (*PL_sighandlerp)(sig);
1408 S_raise_signal(aTHX_ sig);
1411 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1413 Perl_csighandler_init(void)
1416 if (PL_sig_handlers_initted) return;
1418 for (sig = 1; sig < SIG_SIZE; sig++) {
1419 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1421 PL_sig_defaulting[sig] = 1;
1422 (void) rsignal(sig, PL_csighandlerp);
1424 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1425 PL_sig_ignoring[sig] = 0;
1428 PL_sig_handlers_initted = 1;
1433 Perl_despatch_signals(pTHX)
1438 for (sig = 1; sig < SIG_SIZE; sig++) {
1439 if (PL_psig_pend[sig]) {
1440 PERL_BLOCKSIG_ADD(set, sig);
1441 PL_psig_pend[sig] = 0;
1442 PERL_BLOCKSIG_BLOCK(set);
1443 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1444 (*PL_sighandlerp)(sig, NULL, NULL);
1446 (*PL_sighandlerp)(sig);
1448 PERL_BLOCKSIG_UNBLOCK(set);
1454 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1459 /* Need to be careful with SvREFCNT_dec(), because that can have side
1460 * effects (due to closures). We must make sure that the new disposition
1461 * is in place before it is called.
1465 #ifdef HAS_SIGPROCMASK
1469 register const char *s = MgPV_const(mg,len);
1471 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1474 if (strEQ(s,"__DIE__"))
1476 else if (strEQ(s,"__WARN__"))
1479 Perl_croak(aTHX_ "No such hook: %s", s);
1482 if (*svp != PERL_WARNHOOK_FATAL)
1488 i = whichsig(s); /* ...no, a brick */
1490 if (ckWARN(WARN_SIGNAL))
1491 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1494 #ifdef HAS_SIGPROCMASK
1495 /* Avoid having the signal arrive at a bad time, if possible. */
1498 sigprocmask(SIG_BLOCK, &set, &save);
1500 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1501 SAVEFREESV(save_sv);
1502 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1505 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1506 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1508 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1509 PL_sig_ignoring[i] = 0;
1511 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1512 PL_sig_defaulting[i] = 0;
1514 SvREFCNT_dec(PL_psig_name[i]);
1515 to_dec = PL_psig_ptr[i];
1516 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1517 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1518 PL_psig_name[i] = newSVpvn(s, len);
1519 SvREADONLY_on(PL_psig_name[i]);
1521 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
1523 (void)rsignal(i, PL_csighandlerp);
1524 #ifdef HAS_SIGPROCMASK
1529 *svp = SvREFCNT_inc_simple_NN(sv);
1531 SvREFCNT_dec(to_dec);
1534 s = SvOK(sv) ? SvPV_force(sv,len) : "DEFAULT";
1535 if (strEQ(s,"IGNORE")) {
1537 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1538 PL_sig_ignoring[i] = 1;
1539 (void)rsignal(i, PL_csighandlerp);
1541 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1545 else if (strEQ(s,"DEFAULT") || !*s) {
1547 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1549 PL_sig_defaulting[i] = 1;
1550 (void)rsignal(i, PL_csighandlerp);
1553 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1558 * We should warn if HINT_STRICT_REFS, but without
1559 * access to a known hint bit in a known OP, we can't
1560 * tell whether HINT_STRICT_REFS is in force or not.
1562 if (!strchr(s,':') && !strchr(s,'\''))
1563 Perl_sv_insert(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"));
1565 (void)rsignal(i, PL_csighandlerp);
1567 *svp = SvREFCNT_inc_simple_NN(sv);
1569 #ifdef HAS_SIGPROCMASK
1574 SvREFCNT_dec(to_dec);
1577 #endif /* !PERL_MICRO */
1580 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1585 PERL_ARGS_ASSERT_MAGIC_SETISA;
1586 PERL_UNUSED_ARG(sv);
1588 /* Bail out if destruction is going on */
1589 if(PL_dirty) return 0;
1591 /* Skip _isaelem because _isa will handle it shortly */
1592 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1595 /* XXX Once it's possible, we need to
1596 detect that our @ISA is aliased in
1597 other stashes, and act on the stashes
1598 of all of the aliases */
1600 /* The first case occurs via setisa,
1601 the second via setisa_elem, which
1602 calls this same magic */
1604 SvTYPE(mg->mg_obj) == SVt_PVGV
1606 : (GV*)SvMAGIC(mg->mg_obj)->mg_obj
1609 mro_isa_changed_in(stash);
1615 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1620 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1622 /* Bail out if destruction is going on */
1623 if(PL_dirty) return 0;
1627 /* XXX see comments in magic_setisa */
1629 SvTYPE(mg->mg_obj) == SVt_PVGV
1631 : (GV*)SvMAGIC(mg->mg_obj)->mg_obj
1634 mro_isa_changed_in(stash);
1640 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1643 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1644 PERL_UNUSED_ARG(sv);
1645 PERL_UNUSED_ARG(mg);
1646 PL_amagic_generation++;
1652 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1654 HV * const hv = (HV*)LvTARG(sv);
1657 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1658 PERL_UNUSED_ARG(mg);
1661 (void) hv_iterinit(hv);
1662 if (! SvTIED_mg((SV*)hv, PERL_MAGIC_tied))
1665 while (hv_iternext(hv))
1670 sv_setiv(sv, (IV)i);
1675 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1677 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1678 PERL_UNUSED_ARG(mg);
1680 hv_ksplit((HV*)LvTARG(sv), SvIV(sv));
1685 /* caller is responsible for stack switching/cleanup */
1687 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1692 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1696 PUSHs(SvTIED_obj(sv, mg));
1699 if (mg->mg_len >= 0)
1700 mPUSHp(mg->mg_ptr, mg->mg_len);
1701 else if (mg->mg_len == HEf_SVKEY)
1702 PUSHs((SV*)mg->mg_ptr);
1704 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1713 return call_method(meth, flags);
1717 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1721 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1725 PUSHSTACKi(PERLSI_MAGIC);
1727 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1728 sv_setsv(sv, *PL_stack_sp--);
1738 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1740 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1743 mg->mg_flags |= MGf_GSKIP;
1744 magic_methpack(sv,mg,"FETCH");
1749 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1753 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1756 PUSHSTACKi(PERLSI_MAGIC);
1757 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1764 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1766 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1768 return magic_methpack(sv,mg,"DELETE");
1773 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1778 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1782 PUSHSTACKi(PERLSI_MAGIC);
1783 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1784 sv = *PL_stack_sp--;
1785 retval = SvIV(sv)-1;
1787 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1792 return (U32) retval;
1796 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1800 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1803 PUSHSTACKi(PERLSI_MAGIC);
1805 XPUSHs(SvTIED_obj(sv, mg));
1807 call_method("CLEAR", G_SCALAR|G_DISCARD);
1815 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1818 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1820 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1824 PUSHSTACKi(PERLSI_MAGIC);
1827 PUSHs(SvTIED_obj(sv, mg));
1832 if (call_method(meth, G_SCALAR))
1833 sv_setsv(key, *PL_stack_sp--);
1842 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1844 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1846 return magic_methpack(sv,mg,"EXISTS");
1850 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1854 SV * const tied = SvTIED_obj((SV*)hv, mg);
1855 HV * const pkg = SvSTASH((SV*)SvRV(tied));
1857 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1859 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1861 if (HvEITER_get(hv))
1862 /* we are in an iteration so the hash cannot be empty */
1864 /* no xhv_eiter so now use FIRSTKEY */
1865 key = sv_newmortal();
1866 magic_nextpack((SV*)hv, mg, key);
1867 HvEITER_set(hv, NULL); /* need to reset iterator */
1868 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1871 /* there is a SCALAR method that we can call */
1873 PUSHSTACKi(PERLSI_MAGIC);
1879 if (call_method("SCALAR", G_SCALAR))
1880 retval = *PL_stack_sp--;
1882 retval = &PL_sv_undef;
1889 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1892 GV * const gv = PL_DBline;
1893 const I32 i = SvTRUE(sv);
1894 SV ** const svp = av_fetch(GvAV(gv),
1895 atoi(MgPV_nolen_const(mg)), FALSE);
1897 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1899 if (svp && SvIOKp(*svp)) {
1900 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1902 /* set or clear breakpoint in the relevant control op */
1904 o->op_flags |= OPf_SPECIAL;
1906 o->op_flags &= ~OPf_SPECIAL;
1913 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1916 const AV * const obj = (AV*)mg->mg_obj;
1918 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1921 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1929 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1932 AV * const obj = (AV*)mg->mg_obj;
1934 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1937 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1939 if (ckWARN(WARN_MISC))
1940 Perl_warner(aTHX_ packWARN(WARN_MISC),
1941 "Attempt to set length of freed array");
1947 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1951 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1952 PERL_UNUSED_ARG(sv);
1954 /* during global destruction, mg_obj may already have been freed */
1955 if (PL_in_clean_all)
1958 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1961 /* arylen scalar holds a pointer back to the array, but doesn't own a
1962 reference. Hence the we (the array) are about to go away with it
1963 still pointing at us. Clear its pointer, else it would be pointing
1964 at free memory. See the comment in sv_magic about reference loops,
1965 and why it can't own a reference to us. */
1972 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1975 SV* const lsv = LvTARG(sv);
1977 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1978 PERL_UNUSED_ARG(mg);
1980 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1981 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1982 if (found && found->mg_len >= 0) {
1983 I32 i = found->mg_len;
1985 sv_pos_b2u(lsv, &i);
1986 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1995 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1998 SV* const lsv = LvTARG(sv);
2004 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2005 PERL_UNUSED_ARG(mg);
2007 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2008 found = mg_find(lsv, PERL_MAGIC_regex_global);
2014 #ifdef PERL_OLD_COPY_ON_WRITE
2016 sv_force_normal_flags(lsv, 0);
2018 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2021 else if (!SvOK(sv)) {
2025 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2027 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2030 ulen = sv_len_utf8(lsv);
2040 else if (pos > (SSize_t)len)
2045 sv_pos_u2b(lsv, &p, 0);
2049 found->mg_len = pos;
2050 found->mg_flags &= ~MGf_MINMATCH;
2056 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2059 SV * const lsv = LvTARG(sv);
2060 const char * const tmps = SvPV_const(lsv,len);
2061 I32 offs = LvTARGOFF(sv);
2062 I32 rem = LvTARGLEN(sv);
2064 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2065 PERL_UNUSED_ARG(mg);
2068 sv_pos_u2b(lsv, &offs, &rem);
2069 if (offs > (I32)len)
2071 if (rem + offs > (I32)len)
2073 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2080 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2084 const char * const tmps = SvPV_const(sv, len);
2085 SV * const lsv = LvTARG(sv);
2086 I32 lvoff = LvTARGOFF(sv);
2087 I32 lvlen = LvTARGLEN(sv);
2089 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2090 PERL_UNUSED_ARG(mg);
2093 sv_utf8_upgrade(lsv);
2094 sv_pos_u2b(lsv, &lvoff, &lvlen);
2095 sv_insert(lsv, lvoff, lvlen, tmps, len);
2096 LvTARGLEN(sv) = sv_len_utf8(sv);
2099 else if (lsv && SvUTF8(lsv)) {
2101 sv_pos_u2b(lsv, &lvoff, &lvlen);
2102 LvTARGLEN(sv) = len;
2103 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2104 sv_insert(lsv, lvoff, lvlen, utf8, len);
2108 sv_insert(lsv, lvoff, lvlen, tmps, len);
2109 LvTARGLEN(sv) = len;
2117 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2121 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2122 PERL_UNUSED_ARG(sv);
2124 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2129 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2133 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2134 PERL_UNUSED_ARG(sv);
2136 /* update taint status */
2145 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2147 SV * const lsv = LvTARG(sv);
2149 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2150 PERL_UNUSED_ARG(mg);
2153 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2161 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2163 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2164 PERL_UNUSED_ARG(mg);
2165 do_vecset(sv); /* XXX slurp this routine */
2170 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2175 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2177 if (LvTARGLEN(sv)) {
2179 SV * const ahv = LvTARG(sv);
2180 HE * const he = hv_fetch_ent((HV*)ahv, mg->mg_obj, FALSE, 0);
2185 AV* const av = (AV*)LvTARG(sv);
2186 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2187 targ = AvARRAY(av)[LvTARGOFF(sv)];
2189 if (targ && (targ != &PL_sv_undef)) {
2190 /* somebody else defined it for us */
2191 SvREFCNT_dec(LvTARG(sv));
2192 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2194 SvREFCNT_dec(mg->mg_obj);
2196 mg->mg_flags &= ~MGf_REFCOUNTED;
2201 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2206 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2208 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2209 PERL_UNUSED_ARG(mg);
2213 sv_setsv(LvTARG(sv), sv);
2214 SvSETMAGIC(LvTARG(sv));
2220 Perl_vivify_defelem(pTHX_ SV *sv)
2226 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2228 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2231 SV * const ahv = LvTARG(sv);
2232 HE * const he = hv_fetch_ent((HV*)ahv, mg->mg_obj, TRUE, 0);
2235 if (!value || value == &PL_sv_undef)
2236 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2239 AV* const av = (AV*)LvTARG(sv);
2240 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2241 LvTARG(sv) = NULL; /* array can't be extended */
2243 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2244 if (!svp || (value = *svp) == &PL_sv_undef)
2245 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2248 SvREFCNT_inc_simple_void(value);
2249 SvREFCNT_dec(LvTARG(sv));
2252 SvREFCNT_dec(mg->mg_obj);
2254 mg->mg_flags &= ~MGf_REFCOUNTED;
2258 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2260 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2261 return Perl_sv_kill_backrefs(aTHX_ sv, (AV*)mg->mg_obj);
2265 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2267 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2268 PERL_UNUSED_CONTEXT;
2275 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2277 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2279 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2281 if (uf && uf->uf_set)
2282 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2287 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2289 const char type = mg->mg_type;
2291 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2293 if (type == PERL_MAGIC_qr) {
2294 } else if (type == PERL_MAGIC_bm) {
2298 assert(type == PERL_MAGIC_fm);
2301 return sv_unmagic(sv, type);
2304 #ifdef USE_LOCALE_COLLATE
2306 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2308 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2311 * RenE<eacute> Descartes said "I think not."
2312 * and vanished with a faint plop.
2314 PERL_UNUSED_CONTEXT;
2315 PERL_UNUSED_ARG(sv);
2317 Safefree(mg->mg_ptr);
2323 #endif /* USE_LOCALE_COLLATE */
2325 /* Just clear the UTF-8 cache data. */
2327 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2329 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2330 PERL_UNUSED_CONTEXT;
2331 PERL_UNUSED_ARG(sv);
2332 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2334 mg->mg_len = -1; /* The mg_len holds the len cache. */
2339 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2342 register const char *s;
2344 register const REGEXP * rx;
2345 const char * const remaining = mg->mg_ptr + 1;
2349 PERL_ARGS_ASSERT_MAGIC_SET;
2351 switch (*mg->mg_ptr) {
2352 case '\015': /* $^MATCH */
2353 if (strEQ(remaining, "ATCH"))
2355 case '`': /* ${^PREMATCH} caught below */
2357 paren = RX_BUFF_IDX_PREMATCH;
2359 case '\'': /* ${^POSTMATCH} caught below */
2361 paren = RX_BUFF_IDX_POSTMATCH;
2365 paren = RX_BUFF_IDX_FULLMATCH;
2367 case '1': case '2': case '3': case '4':
2368 case '5': case '6': case '7': case '8': case '9':
2369 paren = atoi(mg->mg_ptr);
2371 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2372 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2375 /* Croak with a READONLY error when a numbered match var is
2376 * set without a previous pattern match. Unless it's C<local $1>
2378 if (!PL_localizing) {
2379 Perl_croak(aTHX_ PL_no_modify);
2382 case '\001': /* ^A */
2383 sv_setsv(PL_bodytarget, sv);
2385 case '\003': /* ^C */
2386 PL_minus_c = (bool)SvIV(sv);
2389 case '\004': /* ^D */
2391 s = SvPV_nolen_const(sv);
2392 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2393 DEBUG_x(dump_all());
2395 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2398 case '\005': /* ^E */
2399 if (*(mg->mg_ptr+1) == '\0') {
2400 #ifdef MACOS_TRADITIONAL
2401 gMacPerl_OSErr = SvIV(sv);
2404 set_vaxc_errno(SvIV(sv));
2407 SetLastError( SvIV(sv) );
2410 os2_setsyserrno(SvIV(sv));
2412 /* will anyone ever use this? */
2413 SETERRNO(SvIV(sv), 4);
2419 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2421 SvREFCNT_dec(PL_encoding);
2422 if (SvOK(sv) || SvGMAGICAL(sv)) {
2423 PL_encoding = newSVsv(sv);
2430 case '\006': /* ^F */
2431 PL_maxsysfd = SvIV(sv);
2433 case '\010': /* ^H */
2434 PL_hints = SvIV(sv);
2436 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2437 Safefree(PL_inplace);
2438 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2440 case '\017': /* ^O */
2441 if (*(mg->mg_ptr+1) == '\0') {
2442 Safefree(PL_osname);
2445 TAINT_PROPER("assigning to $^O");
2446 PL_osname = savesvpv(sv);
2449 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2451 const char *const start = SvPV(sv, len);
2452 const char *out = (const char*)memchr(start, '\0', len);
2454 struct refcounted_he *tmp_he;
2457 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2459 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2461 /* Opening for input is more common than opening for output, so
2462 ensure that hints for input are sooner on linked list. */
2463 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2464 SVs_TEMP | SvUTF8(sv))
2465 : newSVpvn_flags("", 0, SVs_TEMP | SvUTF8(sv));
2468 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2469 newSVpvs_flags("open>", SVs_TEMP),
2472 /* The UTF-8 setting is carried over */
2473 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2475 PL_compiling.cop_hints_hash
2476 = Perl_refcounted_he_new(aTHX_ tmp_he,
2477 newSVpvs_flags("open<", SVs_TEMP),
2481 case '\020': /* ^P */
2482 if (*remaining == '\0') { /* ^P */
2483 PL_perldb = SvIV(sv);
2484 if (PL_perldb && !PL_DBsingle)
2487 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2489 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2492 case '\024': /* ^T */
2494 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2496 PL_basetime = (Time_t)SvIV(sv);
2499 case '\025': /* ^UTF8CACHE */
2500 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2501 PL_utf8cache = (signed char) sv_2iv(sv);
2504 case '\027': /* ^W & $^WARNING_BITS */
2505 if (*(mg->mg_ptr+1) == '\0') {
2506 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2508 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2509 | (i ? G_WARN_ON : G_WARN_OFF) ;
2512 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2513 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2514 if (!SvPOK(sv) && PL_localizing) {
2515 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2516 PL_compiling.cop_warnings = pWARN_NONE;
2521 int accumulate = 0 ;
2522 int any_fatals = 0 ;
2523 const char * const ptr = SvPV_const(sv, len) ;
2524 for (i = 0 ; i < len ; ++i) {
2525 accumulate |= ptr[i] ;
2526 any_fatals |= (ptr[i] & 0xAA) ;
2529 if (!specialWARN(PL_compiling.cop_warnings))
2530 PerlMemShared_free(PL_compiling.cop_warnings);
2531 PL_compiling.cop_warnings = pWARN_NONE;
2533 /* Yuck. I can't see how to abstract this: */
2534 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2535 WARN_ALL) && !any_fatals) {
2536 if (!specialWARN(PL_compiling.cop_warnings))
2537 PerlMemShared_free(PL_compiling.cop_warnings);
2538 PL_compiling.cop_warnings = pWARN_ALL;
2539 PL_dowarn |= G_WARN_ONCE ;
2543 const char *const p = SvPV_const(sv, len);
2545 PL_compiling.cop_warnings
2546 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2549 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2550 PL_dowarn |= G_WARN_ONCE ;
2558 if (PL_localizing) {
2559 if (PL_localizing == 1)
2560 SAVESPTR(PL_last_in_gv);
2562 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2563 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2566 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2567 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2568 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2571 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2572 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2573 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2576 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2579 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2580 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2581 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2584 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2588 IO * const io = GvIOp(PL_defoutgv);
2591 if ((SvIV(sv)) == 0)
2592 IoFLAGS(io) &= ~IOf_FLUSH;
2594 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2595 PerlIO *ofp = IoOFP(io);
2597 (void)PerlIO_flush(ofp);
2598 IoFLAGS(io) |= IOf_FLUSH;
2604 SvREFCNT_dec(PL_rs);
2605 PL_rs = newSVsv(sv);
2609 SvREFCNT_dec(PL_ors_sv);
2610 if (SvOK(sv) || SvGMAGICAL(sv)) {
2611 PL_ors_sv = newSVsv(sv);
2619 SvREFCNT_dec(PL_ofs_sv);
2620 if (SvOK(sv) || SvGMAGICAL(sv)) {
2621 PL_ofs_sv = newSVsv(sv);
2628 CopARYBASE_set(&PL_compiling, SvIV(sv));
2631 #ifdef COMPLEX_STATUS
2632 if (PL_localizing == 2) {
2633 PL_statusvalue = LvTARGOFF(sv);
2634 PL_statusvalue_vms = LvTARGLEN(sv);
2638 #ifdef VMSISH_STATUS
2640 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2643 STATUS_UNIX_EXIT_SET(SvIV(sv));
2648 # define PERL_VMS_BANG vaxc$errno
2650 # define PERL_VMS_BANG 0
2652 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2653 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2658 if (PL_delaymagic) {
2659 PL_delaymagic |= DM_RUID;
2660 break; /* don't do magic till later */
2663 (void)setruid((Uid_t)PL_uid);
2666 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2668 #ifdef HAS_SETRESUID
2669 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2671 if (PL_uid == PL_euid) { /* special case $< = $> */
2673 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2674 if (PL_uid != 0 && PerlProc_getuid() == 0)
2675 (void)PerlProc_setuid(0);
2677 (void)PerlProc_setuid(PL_uid);
2679 PL_uid = PerlProc_getuid();
2680 Perl_croak(aTHX_ "setruid() not implemented");
2685 PL_uid = PerlProc_getuid();
2686 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2690 if (PL_delaymagic) {
2691 PL_delaymagic |= DM_EUID;
2692 break; /* don't do magic till later */
2695 (void)seteuid((Uid_t)PL_euid);
2698 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2700 #ifdef HAS_SETRESUID
2701 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2703 if (PL_euid == PL_uid) /* special case $> = $< */
2704 PerlProc_setuid(PL_euid);
2706 PL_euid = PerlProc_geteuid();
2707 Perl_croak(aTHX_ "seteuid() not implemented");
2712 PL_euid = PerlProc_geteuid();
2713 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2717 if (PL_delaymagic) {
2718 PL_delaymagic |= DM_RGID;
2719 break; /* don't do magic till later */
2722 (void)setrgid((Gid_t)PL_gid);
2725 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2727 #ifdef HAS_SETRESGID
2728 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2730 if (PL_gid == PL_egid) /* special case $( = $) */
2731 (void)PerlProc_setgid(PL_gid);
2733 PL_gid = PerlProc_getgid();
2734 Perl_croak(aTHX_ "setrgid() not implemented");
2739 PL_gid = PerlProc_getgid();
2740 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2743 #ifdef HAS_SETGROUPS
2745 const char *p = SvPV_const(sv, len);
2746 Groups_t *gary = NULL;
2751 for (i = 0; i < NGROUPS; ++i) {
2752 while (*p && !isSPACE(*p))
2759 Newx(gary, i + 1, Groups_t);
2761 Renew(gary, i + 1, Groups_t);
2765 (void)setgroups(i, gary);
2768 #else /* HAS_SETGROUPS */
2770 #endif /* HAS_SETGROUPS */
2771 if (PL_delaymagic) {
2772 PL_delaymagic |= DM_EGID;
2773 break; /* don't do magic till later */
2776 (void)setegid((Gid_t)PL_egid);
2779 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2781 #ifdef HAS_SETRESGID
2782 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2784 if (PL_egid == PL_gid) /* special case $) = $( */
2785 (void)PerlProc_setgid(PL_egid);
2787 PL_egid = PerlProc_getegid();
2788 Perl_croak(aTHX_ "setegid() not implemented");
2793 PL_egid = PerlProc_getegid();
2794 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2797 PL_chopset = SvPV_force(sv,len);
2799 #ifndef MACOS_TRADITIONAL
2801 LOCK_DOLLARZERO_MUTEX;
2802 #ifdef HAS_SETPROCTITLE
2803 /* The BSDs don't show the argv[] in ps(1) output, they
2804 * show a string from the process struct and provide
2805 * the setproctitle() routine to manipulate that. */
2806 if (PL_origalen != 1) {
2807 s = SvPV_const(sv, len);
2808 # if __FreeBSD_version > 410001
2809 /* The leading "-" removes the "perl: " prefix,
2810 * but not the "(perl) suffix from the ps(1)
2811 * output, because that's what ps(1) shows if the
2812 * argv[] is modified. */
2813 setproctitle("-%s", s);
2814 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2815 /* This doesn't really work if you assume that
2816 * $0 = 'foobar'; will wipe out 'perl' from the $0
2817 * because in ps(1) output the result will be like
2818 * sprintf("perl: %s (perl)", s)
2819 * I guess this is a security feature:
2820 * one (a user process) cannot get rid of the original name.
2822 setproctitle("%s", s);
2825 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2826 if (PL_origalen != 1) {
2828 s = SvPV_const(sv, len);
2829 un.pst_command = (char *)s;
2830 pstat(PSTAT_SETCMD, un, len, 0, 0);
2833 if (PL_origalen > 1) {
2834 /* PL_origalen is set in perl_parse(). */
2835 s = SvPV_force(sv,len);
2836 if (len >= (STRLEN)PL_origalen-1) {
2837 /* Longer than original, will be truncated. We assume that
2838 * PL_origalen bytes are available. */
2839 Copy(s, PL_origargv[0], PL_origalen-1, char);
2842 /* Shorter than original, will be padded. */
2844 /* Special case for Mac OS X: see [perl #38868] */
2847 /* Is the space counterintuitive? Yes.
2848 * (You were expecting \0?)
2849 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2851 const int pad = ' ';
2853 Copy(s, PL_origargv[0], len, char);
2854 PL_origargv[0][len] = 0;
2855 memset(PL_origargv[0] + len + 1,
2856 pad, PL_origalen - len - 1);
2858 PL_origargv[0][PL_origalen-1] = 0;
2859 for (i = 1; i < PL_origargc; i++)
2863 UNLOCK_DOLLARZERO_MUTEX;
2871 Perl_whichsig(pTHX_ const char *sig)
2873 register char* const* sigv;
2875 PERL_ARGS_ASSERT_WHICHSIG;
2876 PERL_UNUSED_CONTEXT;
2878 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2879 if (strEQ(sig,*sigv))
2880 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2882 if (strEQ(sig,"CHLD"))
2886 if (strEQ(sig,"CLD"))
2893 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2894 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2896 Perl_sighandler(int sig)
2899 #ifdef PERL_GET_SIG_CONTEXT
2900 dTHXa(PERL_GET_SIG_CONTEXT);
2907 SV * const tSv = PL_Sv;
2911 XPV * const tXpv = PL_Xpv;
2913 if (PL_savestack_ix + 15 <= PL_savestack_max)
2915 if (PL_markstack_ptr < PL_markstack_max - 2)
2917 if (PL_scopestack_ix < PL_scopestack_max - 3)
2920 if (!PL_psig_ptr[sig]) {
2921 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2926 /* Max number of items pushed there is 3*n or 4. We cannot fix
2927 infinity, so we fix 4 (in fact 5): */
2929 PL_savestack_ix += 5; /* Protect save in progress. */
2930 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2933 PL_markstack_ptr++; /* Protect mark. */
2935 PL_scopestack_ix += 1;
2936 /* sv_2cv is too complicated, try a simpler variant first: */
2937 if (!SvROK(PL_psig_ptr[sig]) || !(cv = (CV*)SvRV(PL_psig_ptr[sig]))
2938 || SvTYPE(cv) != SVt_PVCV) {
2940 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2943 if (!cv || !CvROOT(cv)) {
2944 if (ckWARN(WARN_SIGNAL))
2945 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2946 PL_sig_name[sig], (gv ? GvENAME(gv)
2953 if(PL_psig_name[sig]) {
2954 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2956 #if !defined(PERL_IMPLICIT_CONTEXT)
2960 sv = sv_newmortal();
2961 sv_setpv(sv,PL_sig_name[sig]);
2964 PUSHSTACKi(PERLSI_SIGNAL);
2967 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2969 struct sigaction oact;
2971 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2974 SV *rv = newRV_noinc((SV*)sih);
2975 /* The siginfo fields signo, code, errno, pid, uid,
2976 * addr, status, and band are defined by POSIX/SUSv3. */
2977 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2978 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2979 #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. */
2980 hv_stores(sih, "errno", newSViv(sip->si_errno));
2981 hv_stores(sih, "status", newSViv(sip->si_status));
2982 hv_stores(sih, "uid", newSViv(sip->si_uid));
2983 hv_stores(sih, "pid", newSViv(sip->si_pid));
2984 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2985 hv_stores(sih, "band", newSViv(sip->si_band));
2989 mPUSHp((char *)sip, sizeof(*sip));
2997 call_sv((SV*)cv, G_DISCARD|G_EVAL);
3000 if (SvTRUE(ERRSV)) {
3002 #ifdef HAS_SIGPROCMASK
3003 /* Handler "died", for example to get out of a restart-able read().
3004 * Before we re-do that on its behalf re-enable the signal which was
3005 * blocked by the system when we entered.
3009 sigaddset(&set,sig);
3010 sigprocmask(SIG_UNBLOCK, &set, NULL);
3012 /* Not clear if this will work */
3013 (void)rsignal(sig, SIG_IGN);
3014 (void)rsignal(sig, PL_csighandlerp);
3016 #endif /* !PERL_MICRO */
3017 Perl_die(aTHX_ NULL);
3021 PL_savestack_ix -= 8; /* Unprotect save in progress. */
3025 PL_scopestack_ix -= 1;
3028 PL_op = myop; /* Apparently not needed... */
3030 PL_Sv = tSv; /* Restore global temporaries. */
3037 S_restore_magic(pTHX_ const void *p)
3040 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3041 SV* const sv = mgs->mgs_sv;
3046 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3048 #ifdef PERL_OLD_COPY_ON_WRITE
3049 /* While magic was saved (and off) sv_setsv may well have seen
3050 this SV as a prime candidate for COW. */
3052 sv_force_normal_flags(sv, 0);
3056 SvFLAGS(sv) |= mgs->mgs_flags;
3059 if (SvGMAGICAL(sv)) {
3060 /* downgrade public flags to private,
3061 and discard any other private flags */
3063 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3065 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3066 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3071 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3073 /* If we're still on top of the stack, pop us off. (That condition
3074 * will be satisfied if restore_magic was called explicitly, but *not*
3075 * if it's being called via leave_scope.)
3076 * The reason for doing this is that otherwise, things like sv_2cv()
3077 * may leave alloc gunk on the savestack, and some code
3078 * (e.g. sighandler) doesn't expect that...
3080 if (PL_savestack_ix == mgs->mgs_ss_ix)
3082 I32 popval = SSPOPINT;
3083 assert(popval == SAVEt_DESTRUCTOR_X);
3084 PL_savestack_ix -= 2;
3086 assert(popval == SAVEt_ALLOC);
3088 PL_savestack_ix -= popval;
3094 S_unwind_handler_stack(pTHX_ const void *p)
3097 const U32 flags = *(const U32*)p;
3099 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3102 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3103 #if !defined(PERL_IMPLICIT_CONTEXT)
3105 SvREFCNT_dec(PL_sig_sv);
3110 =for apidoc magic_sethint
3112 Triggered by a store to %^H, records the key/value pair to
3113 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3114 anything that would need a deep copy. Maybe we should warn if we find a
3120 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3123 SV *key = (mg->mg_len == HEf_SVKEY) ? (SV *)mg->mg_ptr
3124 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3126 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3128 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3129 an alternative leaf in there, with PL_compiling.cop_hints being used if
3130 it's NULL. If needed for threads, the alternative could lock a mutex,
3131 or take other more complex action. */
3133 /* Something changed in %^H, so it will need to be restored on scope exit.
3134 Doing this here saves a lot of doing it manually in perl code (and
3135 forgetting to do it, and consequent subtle errors. */
3136 PL_hints |= HINT_LOCALIZE_HH;
3137 PL_compiling.cop_hints_hash
3138 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3143 =for apidoc magic_clearhint
3145 Triggered by a delete from %^H, records the key to
3146 C<PL_compiling.cop_hints_hash>.
3151 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3155 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3156 PERL_UNUSED_ARG(sv);
3158 assert(mg->mg_len == HEf_SVKEY);
3160 PERL_UNUSED_ARG(sv);
3162 PL_hints |= HINT_LOCALIZE_HH;
3163 PL_compiling.cop_hints_hash
3164 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3165 (SV *)mg->mg_ptr, &PL_sv_placeholder);
3171 * c-indentation-style: bsd
3173 * indent-tabs-mode: t
3176 * ex: set ts=8 sts=4 sw=4 noet: