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 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1374 (void) rsignal(sig, PL_csighandlerp);
1375 if (PL_sig_ignoring[sig]) return;
1377 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1378 if (PL_sig_defaulting[sig])
1379 #ifdef KILL_BY_SIGPRC
1380 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1395 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1396 /* Call the perl level handler now--
1397 * with risk we may be in malloc() etc. */
1398 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1399 (*PL_sighandlerp)(sig, NULL, NULL);
1401 (*PL_sighandlerp)(sig);
1404 S_raise_signal(aTHX_ sig);
1407 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1409 Perl_csighandler_init(void)
1412 if (PL_sig_handlers_initted) return;
1414 for (sig = 1; sig < SIG_SIZE; sig++) {
1415 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1417 PL_sig_defaulting[sig] = 1;
1418 (void) rsignal(sig, PL_csighandlerp);
1420 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1421 PL_sig_ignoring[sig] = 0;
1424 PL_sig_handlers_initted = 1;
1429 Perl_despatch_signals(pTHX)
1434 for (sig = 1; sig < SIG_SIZE; sig++) {
1435 if (PL_psig_pend[sig]) {
1436 PERL_BLOCKSIG_ADD(set, sig);
1437 PL_psig_pend[sig] = 0;
1438 PERL_BLOCKSIG_BLOCK(set);
1439 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1440 (*PL_sighandlerp)(sig, NULL, NULL);
1442 (*PL_sighandlerp)(sig);
1444 PERL_BLOCKSIG_UNBLOCK(set);
1450 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1455 /* Need to be careful with SvREFCNT_dec(), because that can have side
1456 * effects (due to closures). We must make sure that the new disposition
1457 * is in place before it is called.
1461 #ifdef HAS_SIGPROCMASK
1465 register const char *s = MgPV_const(mg,len);
1467 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1470 if (strEQ(s,"__DIE__"))
1472 else if (strEQ(s,"__WARN__"))
1475 Perl_croak(aTHX_ "No such hook: %s", s);
1478 if (*svp != PERL_WARNHOOK_FATAL)
1484 i = whichsig(s); /* ...no, a brick */
1486 if (ckWARN(WARN_SIGNAL))
1487 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1490 #ifdef HAS_SIGPROCMASK
1491 /* Avoid having the signal arrive at a bad time, if possible. */
1494 sigprocmask(SIG_BLOCK, &set, &save);
1496 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1497 SAVEFREESV(save_sv);
1498 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1501 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1502 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1504 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1505 PL_sig_ignoring[i] = 0;
1507 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1508 PL_sig_defaulting[i] = 0;
1510 SvREFCNT_dec(PL_psig_name[i]);
1511 to_dec = PL_psig_ptr[i];
1512 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1513 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1514 PL_psig_name[i] = newSVpvn(s, len);
1515 SvREADONLY_on(PL_psig_name[i]);
1517 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
1519 (void)rsignal(i, PL_csighandlerp);
1520 #ifdef HAS_SIGPROCMASK
1525 *svp = SvREFCNT_inc_simple_NN(sv);
1527 SvREFCNT_dec(to_dec);
1530 s = SvOK(sv) ? SvPV_force(sv,len) : "DEFAULT";
1531 if (strEQ(s,"IGNORE")) {
1533 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1534 PL_sig_ignoring[i] = 1;
1535 (void)rsignal(i, PL_csighandlerp);
1537 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1541 else if (strEQ(s,"DEFAULT") || !*s) {
1543 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1545 PL_sig_defaulting[i] = 1;
1546 (void)rsignal(i, PL_csighandlerp);
1549 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1554 * We should warn if HINT_STRICT_REFS, but without
1555 * access to a known hint bit in a known OP, we can't
1556 * tell whether HINT_STRICT_REFS is in force or not.
1558 if (!strchr(s,':') && !strchr(s,'\''))
1559 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1562 (void)rsignal(i, PL_csighandlerp);
1564 *svp = SvREFCNT_inc_simple_NN(sv);
1566 #ifdef HAS_SIGPROCMASK
1571 SvREFCNT_dec(to_dec);
1574 #endif /* !PERL_MICRO */
1577 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1582 PERL_ARGS_ASSERT_MAGIC_SETISA;
1583 PERL_UNUSED_ARG(sv);
1585 /* Bail out if destruction is going on */
1586 if(PL_dirty) return 0;
1588 /* Skip _isaelem because _isa will handle it shortly */
1589 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1592 /* XXX Once it's possible, we need to
1593 detect that our @ISA is aliased in
1594 other stashes, and act on the stashes
1595 of all of the aliases */
1597 /* The first case occurs via setisa,
1598 the second via setisa_elem, which
1599 calls this same magic */
1601 SvTYPE(mg->mg_obj) == SVt_PVGV
1603 : (GV*)SvMAGIC(mg->mg_obj)->mg_obj
1607 mro_isa_changed_in(stash);
1613 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1618 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1620 /* Bail out if destruction is going on */
1621 if(PL_dirty) return 0;
1625 /* XXX see comments in magic_setisa */
1627 SvTYPE(mg->mg_obj) == SVt_PVGV
1629 : (GV*)SvMAGIC(mg->mg_obj)->mg_obj
1633 mro_isa_changed_in(stash);
1639 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1642 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1643 PERL_UNUSED_ARG(sv);
1644 PERL_UNUSED_ARG(mg);
1645 PL_amagic_generation++;
1651 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1653 HV * const hv = (HV*)LvTARG(sv);
1656 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1657 PERL_UNUSED_ARG(mg);
1660 (void) hv_iterinit(hv);
1661 if (! SvTIED_mg((SV*)hv, PERL_MAGIC_tied))
1664 while (hv_iternext(hv))
1669 sv_setiv(sv, (IV)i);
1674 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1676 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1677 PERL_UNUSED_ARG(mg);
1679 hv_ksplit((HV*)LvTARG(sv), SvIV(sv));
1684 /* caller is responsible for stack switching/cleanup */
1686 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1691 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1695 PUSHs(SvTIED_obj(sv, mg));
1698 if (mg->mg_len >= 0)
1699 mPUSHp(mg->mg_ptr, mg->mg_len);
1700 else if (mg->mg_len == HEf_SVKEY)
1701 PUSHs((SV*)mg->mg_ptr);
1703 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1712 return call_method(meth, flags);
1716 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1720 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1724 PUSHSTACKi(PERLSI_MAGIC);
1726 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1727 sv_setsv(sv, *PL_stack_sp--);
1737 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1739 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1742 mg->mg_flags |= MGf_GSKIP;
1743 magic_methpack(sv,mg,"FETCH");
1748 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1752 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1755 PUSHSTACKi(PERLSI_MAGIC);
1756 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1763 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1765 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1767 return magic_methpack(sv,mg,"DELETE");
1772 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1777 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1781 PUSHSTACKi(PERLSI_MAGIC);
1782 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1783 sv = *PL_stack_sp--;
1784 retval = SvIV(sv)-1;
1786 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1791 return (U32) retval;
1795 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1799 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1802 PUSHSTACKi(PERLSI_MAGIC);
1804 XPUSHs(SvTIED_obj(sv, mg));
1806 call_method("CLEAR", G_SCALAR|G_DISCARD);
1814 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1817 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1819 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1823 PUSHSTACKi(PERLSI_MAGIC);
1826 PUSHs(SvTIED_obj(sv, mg));
1831 if (call_method(meth, G_SCALAR))
1832 sv_setsv(key, *PL_stack_sp--);
1841 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1843 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1845 return magic_methpack(sv,mg,"EXISTS");
1849 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1853 SV * const tied = SvTIED_obj((SV*)hv, mg);
1854 HV * const pkg = SvSTASH((SV*)SvRV(tied));
1856 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1858 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1860 if (HvEITER_get(hv))
1861 /* we are in an iteration so the hash cannot be empty */
1863 /* no xhv_eiter so now use FIRSTKEY */
1864 key = sv_newmortal();
1865 magic_nextpack((SV*)hv, mg, key);
1866 HvEITER_set(hv, NULL); /* need to reset iterator */
1867 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1870 /* there is a SCALAR method that we can call */
1872 PUSHSTACKi(PERLSI_MAGIC);
1878 if (call_method("SCALAR", G_SCALAR))
1879 retval = *PL_stack_sp--;
1881 retval = &PL_sv_undef;
1888 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1891 GV * const gv = PL_DBline;
1892 const I32 i = SvTRUE(sv);
1893 SV ** const svp = av_fetch(GvAV(gv),
1894 atoi(MgPV_nolen_const(mg)), FALSE);
1896 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1898 if (svp && SvIOKp(*svp)) {
1899 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1901 /* set or clear breakpoint in the relevant control op */
1903 o->op_flags |= OPf_SPECIAL;
1905 o->op_flags &= ~OPf_SPECIAL;
1912 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1915 const AV * const obj = (AV*)mg->mg_obj;
1917 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1920 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1928 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1931 AV * const obj = (AV*)mg->mg_obj;
1933 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1936 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1938 if (ckWARN(WARN_MISC))
1939 Perl_warner(aTHX_ packWARN(WARN_MISC),
1940 "Attempt to set length of freed array");
1946 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1950 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
1951 PERL_UNUSED_ARG(sv);
1953 /* during global destruction, mg_obj may already have been freed */
1954 if (PL_in_clean_all)
1957 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1960 /* arylen scalar holds a pointer back to the array, but doesn't own a
1961 reference. Hence the we (the array) are about to go away with it
1962 still pointing at us. Clear its pointer, else it would be pointing
1963 at free memory. See the comment in sv_magic about reference loops,
1964 and why it can't own a reference to us. */
1971 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1974 SV* const lsv = LvTARG(sv);
1976 PERL_ARGS_ASSERT_MAGIC_GETPOS;
1977 PERL_UNUSED_ARG(mg);
1979 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1980 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1981 if (found && found->mg_len >= 0) {
1982 I32 i = found->mg_len;
1984 sv_pos_b2u(lsv, &i);
1985 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1994 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1997 SV* const lsv = LvTARG(sv);
2003 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2004 PERL_UNUSED_ARG(mg);
2006 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2007 found = mg_find(lsv, PERL_MAGIC_regex_global);
2013 #ifdef PERL_OLD_COPY_ON_WRITE
2015 sv_force_normal_flags(lsv, 0);
2017 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2020 else if (!SvOK(sv)) {
2024 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2026 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2029 ulen = sv_len_utf8(lsv);
2039 else if (pos > (SSize_t)len)
2044 sv_pos_u2b(lsv, &p, 0);
2048 found->mg_len = pos;
2049 found->mg_flags &= ~MGf_MINMATCH;
2055 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2058 SV * const lsv = LvTARG(sv);
2059 const char * const tmps = SvPV_const(lsv,len);
2060 I32 offs = LvTARGOFF(sv);
2061 I32 rem = LvTARGLEN(sv);
2063 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2064 PERL_UNUSED_ARG(mg);
2067 sv_pos_u2b(lsv, &offs, &rem);
2068 if (offs > (I32)len)
2070 if (rem + offs > (I32)len)
2072 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
2079 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2083 const char * const tmps = SvPV_const(sv, len);
2084 SV * const lsv = LvTARG(sv);
2085 I32 lvoff = LvTARGOFF(sv);
2086 I32 lvlen = LvTARGLEN(sv);
2088 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2089 PERL_UNUSED_ARG(mg);
2092 sv_utf8_upgrade(lsv);
2093 sv_pos_u2b(lsv, &lvoff, &lvlen);
2094 sv_insert(lsv, lvoff, lvlen, tmps, len);
2095 LvTARGLEN(sv) = sv_len_utf8(sv);
2098 else if (lsv && SvUTF8(lsv)) {
2100 sv_pos_u2b(lsv, &lvoff, &lvlen);
2101 LvTARGLEN(sv) = len;
2102 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2103 sv_insert(lsv, lvoff, lvlen, utf8, len);
2107 sv_insert(lsv, lvoff, lvlen, tmps, len);
2108 LvTARGLEN(sv) = len;
2116 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2120 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2121 PERL_UNUSED_ARG(sv);
2123 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2128 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2132 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2133 PERL_UNUSED_ARG(sv);
2135 /* update taint status */
2144 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2146 SV * const lsv = LvTARG(sv);
2148 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2149 PERL_UNUSED_ARG(mg);
2152 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2160 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2162 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2163 PERL_UNUSED_ARG(mg);
2164 do_vecset(sv); /* XXX slurp this routine */
2169 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2174 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2176 if (LvTARGLEN(sv)) {
2178 SV * const ahv = LvTARG(sv);
2179 HE * const he = hv_fetch_ent((HV*)ahv, mg->mg_obj, FALSE, 0);
2184 AV* const av = (AV*)LvTARG(sv);
2185 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2186 targ = AvARRAY(av)[LvTARGOFF(sv)];
2188 if (targ && (targ != &PL_sv_undef)) {
2189 /* somebody else defined it for us */
2190 SvREFCNT_dec(LvTARG(sv));
2191 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2193 SvREFCNT_dec(mg->mg_obj);
2195 mg->mg_flags &= ~MGf_REFCOUNTED;
2200 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2205 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2207 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2208 PERL_UNUSED_ARG(mg);
2212 sv_setsv(LvTARG(sv), sv);
2213 SvSETMAGIC(LvTARG(sv));
2219 Perl_vivify_defelem(pTHX_ SV *sv)
2225 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2227 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2230 SV * const ahv = LvTARG(sv);
2231 HE * const he = hv_fetch_ent((HV*)ahv, mg->mg_obj, TRUE, 0);
2234 if (!value || value == &PL_sv_undef)
2235 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2238 AV* const av = (AV*)LvTARG(sv);
2239 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2240 LvTARG(sv) = NULL; /* array can't be extended */
2242 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2243 if (!svp || (value = *svp) == &PL_sv_undef)
2244 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2247 SvREFCNT_inc_simple_void(value);
2248 SvREFCNT_dec(LvTARG(sv));
2251 SvREFCNT_dec(mg->mg_obj);
2253 mg->mg_flags &= ~MGf_REFCOUNTED;
2257 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2259 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2260 return Perl_sv_kill_backrefs(aTHX_ sv, (AV*)mg->mg_obj);
2264 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2266 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2267 PERL_UNUSED_CONTEXT;
2274 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2276 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2278 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2280 if (uf && uf->uf_set)
2281 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2286 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2288 const char type = mg->mg_type;
2290 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2292 if (type == PERL_MAGIC_qr) {
2293 } else if (type == PERL_MAGIC_bm) {
2297 assert(type == PERL_MAGIC_fm);
2300 return sv_unmagic(sv, type);
2303 #ifdef USE_LOCALE_COLLATE
2305 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2307 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2310 * RenE<eacute> Descartes said "I think not."
2311 * and vanished with a faint plop.
2313 PERL_UNUSED_CONTEXT;
2314 PERL_UNUSED_ARG(sv);
2316 Safefree(mg->mg_ptr);
2322 #endif /* USE_LOCALE_COLLATE */
2324 /* Just clear the UTF-8 cache data. */
2326 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2328 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2329 PERL_UNUSED_CONTEXT;
2330 PERL_UNUSED_ARG(sv);
2331 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2333 mg->mg_len = -1; /* The mg_len holds the len cache. */
2338 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2341 register const char *s;
2343 register const REGEXP * rx;
2344 const char * const remaining = mg->mg_ptr + 1;
2348 PERL_ARGS_ASSERT_MAGIC_SET;
2350 switch (*mg->mg_ptr) {
2351 case '\015': /* $^MATCH */
2352 if (strEQ(remaining, "ATCH"))
2354 case '`': /* ${^PREMATCH} caught below */
2356 paren = RX_BUFF_IDX_PREMATCH;
2358 case '\'': /* ${^POSTMATCH} caught below */
2360 paren = RX_BUFF_IDX_POSTMATCH;
2364 paren = RX_BUFF_IDX_FULLMATCH;
2366 case '1': case '2': case '3': case '4':
2367 case '5': case '6': case '7': case '8': case '9':
2368 paren = atoi(mg->mg_ptr);
2370 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2371 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2374 /* Croak with a READONLY error when a numbered match var is
2375 * set without a previous pattern match. Unless it's C<local $1>
2377 if (!PL_localizing) {
2378 Perl_croak(aTHX_ PL_no_modify);
2381 case '\001': /* ^A */
2382 sv_setsv(PL_bodytarget, sv);
2384 case '\003': /* ^C */
2385 PL_minus_c = (bool)SvIV(sv);
2388 case '\004': /* ^D */
2390 s = SvPV_nolen_const(sv);
2391 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2392 DEBUG_x(dump_all());
2394 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2397 case '\005': /* ^E */
2398 if (*(mg->mg_ptr+1) == '\0') {
2399 #ifdef MACOS_TRADITIONAL
2400 gMacPerl_OSErr = SvIV(sv);
2403 set_vaxc_errno(SvIV(sv));
2406 SetLastError( SvIV(sv) );
2409 os2_setsyserrno(SvIV(sv));
2411 /* will anyone ever use this? */
2412 SETERRNO(SvIV(sv), 4);
2418 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2420 SvREFCNT_dec(PL_encoding);
2421 if (SvOK(sv) || SvGMAGICAL(sv)) {
2422 PL_encoding = newSVsv(sv);
2429 case '\006': /* ^F */
2430 PL_maxsysfd = SvIV(sv);
2432 case '\010': /* ^H */
2433 PL_hints = SvIV(sv);
2435 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2436 Safefree(PL_inplace);
2437 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2439 case '\017': /* ^O */
2440 if (*(mg->mg_ptr+1) == '\0') {
2441 Safefree(PL_osname);
2444 TAINT_PROPER("assigning to $^O");
2445 PL_osname = savesvpv(sv);
2448 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2450 const char *const start = SvPV(sv, len);
2451 const char *out = (const char*)memchr(start, '\0', len);
2453 struct refcounted_he *tmp_he;
2456 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2458 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2460 /* Opening for input is more common than opening for output, so
2461 ensure that hints for input are sooner on linked list. */
2462 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2463 SVs_TEMP | SvUTF8(sv))
2464 : newSVpvn_flags("", 0, SVs_TEMP | SvUTF8(sv));
2467 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2468 newSVpvs_flags("open>", SVs_TEMP),
2471 /* The UTF-8 setting is carried over */
2472 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2474 PL_compiling.cop_hints_hash
2475 = Perl_refcounted_he_new(aTHX_ tmp_he,
2476 newSVpvs_flags("open<", SVs_TEMP),
2480 case '\020': /* ^P */
2481 if (*remaining == '\0') { /* ^P */
2482 PL_perldb = SvIV(sv);
2483 if (PL_perldb && !PL_DBsingle)
2486 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2488 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2491 case '\024': /* ^T */
2493 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2495 PL_basetime = (Time_t)SvIV(sv);
2498 case '\025': /* ^UTF8CACHE */
2499 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2500 PL_utf8cache = (signed char) sv_2iv(sv);
2503 case '\027': /* ^W & $^WARNING_BITS */
2504 if (*(mg->mg_ptr+1) == '\0') {
2505 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2507 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2508 | (i ? G_WARN_ON : G_WARN_OFF) ;
2511 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2512 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2513 if (!SvPOK(sv) && PL_localizing) {
2514 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2515 PL_compiling.cop_warnings = pWARN_NONE;
2520 int accumulate = 0 ;
2521 int any_fatals = 0 ;
2522 const char * const ptr = SvPV_const(sv, len) ;
2523 for (i = 0 ; i < len ; ++i) {
2524 accumulate |= ptr[i] ;
2525 any_fatals |= (ptr[i] & 0xAA) ;
2528 if (!specialWARN(PL_compiling.cop_warnings))
2529 PerlMemShared_free(PL_compiling.cop_warnings);
2530 PL_compiling.cop_warnings = pWARN_NONE;
2532 /* Yuck. I can't see how to abstract this: */
2533 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2534 WARN_ALL) && !any_fatals) {
2535 if (!specialWARN(PL_compiling.cop_warnings))
2536 PerlMemShared_free(PL_compiling.cop_warnings);
2537 PL_compiling.cop_warnings = pWARN_ALL;
2538 PL_dowarn |= G_WARN_ONCE ;
2542 const char *const p = SvPV_const(sv, len);
2544 PL_compiling.cop_warnings
2545 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2548 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2549 PL_dowarn |= G_WARN_ONCE ;
2557 if (PL_localizing) {
2558 if (PL_localizing == 1)
2559 SAVESPTR(PL_last_in_gv);
2561 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2562 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2565 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2566 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2567 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2570 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2571 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2572 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2575 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2578 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2579 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2580 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2583 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2587 IO * const io = GvIOp(PL_defoutgv);
2590 if ((SvIV(sv)) == 0)
2591 IoFLAGS(io) &= ~IOf_FLUSH;
2593 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2594 PerlIO *ofp = IoOFP(io);
2596 (void)PerlIO_flush(ofp);
2597 IoFLAGS(io) |= IOf_FLUSH;
2603 SvREFCNT_dec(PL_rs);
2604 PL_rs = newSVsv(sv);
2608 SvREFCNT_dec(PL_ors_sv);
2609 if (SvOK(sv) || SvGMAGICAL(sv)) {
2610 PL_ors_sv = newSVsv(sv);
2618 SvREFCNT_dec(PL_ofs_sv);
2619 if (SvOK(sv) || SvGMAGICAL(sv)) {
2620 PL_ofs_sv = newSVsv(sv);
2627 CopARYBASE_set(&PL_compiling, SvIV(sv));
2630 #ifdef COMPLEX_STATUS
2631 if (PL_localizing == 2) {
2632 PL_statusvalue = LvTARGOFF(sv);
2633 PL_statusvalue_vms = LvTARGLEN(sv);
2637 #ifdef VMSISH_STATUS
2639 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2642 STATUS_UNIX_EXIT_SET(SvIV(sv));
2647 # define PERL_VMS_BANG vaxc$errno
2649 # define PERL_VMS_BANG 0
2651 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2652 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2657 if (PL_delaymagic) {
2658 PL_delaymagic |= DM_RUID;
2659 break; /* don't do magic till later */
2662 (void)setruid((Uid_t)PL_uid);
2665 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2667 #ifdef HAS_SETRESUID
2668 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2670 if (PL_uid == PL_euid) { /* special case $< = $> */
2672 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2673 if (PL_uid != 0 && PerlProc_getuid() == 0)
2674 (void)PerlProc_setuid(0);
2676 (void)PerlProc_setuid(PL_uid);
2678 PL_uid = PerlProc_getuid();
2679 Perl_croak(aTHX_ "setruid() not implemented");
2684 PL_uid = PerlProc_getuid();
2685 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2689 if (PL_delaymagic) {
2690 PL_delaymagic |= DM_EUID;
2691 break; /* don't do magic till later */
2694 (void)seteuid((Uid_t)PL_euid);
2697 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2699 #ifdef HAS_SETRESUID
2700 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2702 if (PL_euid == PL_uid) /* special case $> = $< */
2703 PerlProc_setuid(PL_euid);
2705 PL_euid = PerlProc_geteuid();
2706 Perl_croak(aTHX_ "seteuid() not implemented");
2711 PL_euid = PerlProc_geteuid();
2712 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2716 if (PL_delaymagic) {
2717 PL_delaymagic |= DM_RGID;
2718 break; /* don't do magic till later */
2721 (void)setrgid((Gid_t)PL_gid);
2724 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2726 #ifdef HAS_SETRESGID
2727 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2729 if (PL_gid == PL_egid) /* special case $( = $) */
2730 (void)PerlProc_setgid(PL_gid);
2732 PL_gid = PerlProc_getgid();
2733 Perl_croak(aTHX_ "setrgid() not implemented");
2738 PL_gid = PerlProc_getgid();
2739 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2742 #ifdef HAS_SETGROUPS
2744 const char *p = SvPV_const(sv, len);
2745 Groups_t *gary = NULL;
2750 for (i = 0; i < NGROUPS; ++i) {
2751 while (*p && !isSPACE(*p))
2758 Newx(gary, i + 1, Groups_t);
2760 Renew(gary, i + 1, Groups_t);
2764 (void)setgroups(i, gary);
2767 #else /* HAS_SETGROUPS */
2769 #endif /* HAS_SETGROUPS */
2770 if (PL_delaymagic) {
2771 PL_delaymagic |= DM_EGID;
2772 break; /* don't do magic till later */
2775 (void)setegid((Gid_t)PL_egid);
2778 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2780 #ifdef HAS_SETRESGID
2781 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2783 if (PL_egid == PL_gid) /* special case $) = $( */
2784 (void)PerlProc_setgid(PL_egid);
2786 PL_egid = PerlProc_getegid();
2787 Perl_croak(aTHX_ "setegid() not implemented");
2792 PL_egid = PerlProc_getegid();
2793 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2796 PL_chopset = SvPV_force(sv,len);
2798 #ifndef MACOS_TRADITIONAL
2800 LOCK_DOLLARZERO_MUTEX;
2801 #ifdef HAS_SETPROCTITLE
2802 /* The BSDs don't show the argv[] in ps(1) output, they
2803 * show a string from the process struct and provide
2804 * the setproctitle() routine to manipulate that. */
2805 if (PL_origalen != 1) {
2806 s = SvPV_const(sv, len);
2807 # if __FreeBSD_version > 410001
2808 /* The leading "-" removes the "perl: " prefix,
2809 * but not the "(perl) suffix from the ps(1)
2810 * output, because that's what ps(1) shows if the
2811 * argv[] is modified. */
2812 setproctitle("-%s", s);
2813 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2814 /* This doesn't really work if you assume that
2815 * $0 = 'foobar'; will wipe out 'perl' from the $0
2816 * because in ps(1) output the result will be like
2817 * sprintf("perl: %s (perl)", s)
2818 * I guess this is a security feature:
2819 * one (a user process) cannot get rid of the original name.
2821 setproctitle("%s", s);
2824 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2825 if (PL_origalen != 1) {
2827 s = SvPV_const(sv, len);
2828 un.pst_command = (char *)s;
2829 pstat(PSTAT_SETCMD, un, len, 0, 0);
2832 if (PL_origalen > 1) {
2833 /* PL_origalen is set in perl_parse(). */
2834 s = SvPV_force(sv,len);
2835 if (len >= (STRLEN)PL_origalen-1) {
2836 /* Longer than original, will be truncated. We assume that
2837 * PL_origalen bytes are available. */
2838 Copy(s, PL_origargv[0], PL_origalen-1, char);
2841 /* Shorter than original, will be padded. */
2843 /* Special case for Mac OS X: see [perl #38868] */
2846 /* Is the space counterintuitive? Yes.
2847 * (You were expecting \0?)
2848 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2850 const int pad = ' ';
2852 Copy(s, PL_origargv[0], len, char);
2853 PL_origargv[0][len] = 0;
2854 memset(PL_origargv[0] + len + 1,
2855 pad, PL_origalen - len - 1);
2857 PL_origargv[0][PL_origalen-1] = 0;
2858 for (i = 1; i < PL_origargc; i++)
2862 UNLOCK_DOLLARZERO_MUTEX;
2870 Perl_whichsig(pTHX_ const char *sig)
2872 register char* const* sigv;
2874 PERL_ARGS_ASSERT_WHICHSIG;
2875 PERL_UNUSED_CONTEXT;
2877 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2878 if (strEQ(sig,*sigv))
2879 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2881 if (strEQ(sig,"CHLD"))
2885 if (strEQ(sig,"CLD"))
2892 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2893 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2895 Perl_sighandler(int sig)
2898 #ifdef PERL_GET_SIG_CONTEXT
2899 dTHXa(PERL_GET_SIG_CONTEXT);
2906 SV * const tSv = PL_Sv;
2910 XPV * const tXpv = PL_Xpv;
2912 if (PL_savestack_ix + 15 <= PL_savestack_max)
2914 if (PL_markstack_ptr < PL_markstack_max - 2)
2916 if (PL_scopestack_ix < PL_scopestack_max - 3)
2919 if (!PL_psig_ptr[sig]) {
2920 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2925 /* Max number of items pushed there is 3*n or 4. We cannot fix
2926 infinity, so we fix 4 (in fact 5): */
2928 PL_savestack_ix += 5; /* Protect save in progress. */
2929 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2932 PL_markstack_ptr++; /* Protect mark. */
2934 PL_scopestack_ix += 1;
2935 /* sv_2cv is too complicated, try a simpler variant first: */
2936 if (!SvROK(PL_psig_ptr[sig]) || !(cv = (CV*)SvRV(PL_psig_ptr[sig]))
2937 || SvTYPE(cv) != SVt_PVCV) {
2939 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2942 if (!cv || !CvROOT(cv)) {
2943 if (ckWARN(WARN_SIGNAL))
2944 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2945 PL_sig_name[sig], (gv ? GvENAME(gv)
2952 if(PL_psig_name[sig]) {
2953 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2955 #if !defined(PERL_IMPLICIT_CONTEXT)
2959 sv = sv_newmortal();
2960 sv_setpv(sv,PL_sig_name[sig]);
2963 PUSHSTACKi(PERLSI_SIGNAL);
2966 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2968 struct sigaction oact;
2970 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2973 SV *rv = newRV_noinc((SV*)sih);
2974 /* The siginfo fields signo, code, errno, pid, uid,
2975 * addr, status, and band are defined by POSIX/SUSv3. */
2976 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2977 (void)hv_stores(sih, "code", newSViv(sip->si_code));
2978 #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. */
2979 hv_stores(sih, "errno", newSViv(sip->si_errno));
2980 hv_stores(sih, "status", newSViv(sip->si_status));
2981 hv_stores(sih, "uid", newSViv(sip->si_uid));
2982 hv_stores(sih, "pid", newSViv(sip->si_pid));
2983 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2984 hv_stores(sih, "band", newSViv(sip->si_band));
2988 mPUSHp((char *)sip, sizeof(*sip));
2996 call_sv((SV*)cv, G_DISCARD|G_EVAL);
2999 if (SvTRUE(ERRSV)) {
3001 #ifdef HAS_SIGPROCMASK
3002 /* Handler "died", for example to get out of a restart-able read().
3003 * Before we re-do that on its behalf re-enable the signal which was
3004 * blocked by the system when we entered.
3008 sigaddset(&set,sig);
3009 sigprocmask(SIG_UNBLOCK, &set, NULL);
3011 /* Not clear if this will work */
3012 (void)rsignal(sig, SIG_IGN);
3013 (void)rsignal(sig, PL_csighandlerp);
3015 #endif /* !PERL_MICRO */
3016 Perl_die(aTHX_ NULL);
3020 PL_savestack_ix -= 8; /* Unprotect save in progress. */
3024 PL_scopestack_ix -= 1;
3027 PL_op = myop; /* Apparently not needed... */
3029 PL_Sv = tSv; /* Restore global temporaries. */
3036 S_restore_magic(pTHX_ const void *p)
3039 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3040 SV* const sv = mgs->mgs_sv;
3045 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3047 #ifdef PERL_OLD_COPY_ON_WRITE
3048 /* While magic was saved (and off) sv_setsv may well have seen
3049 this SV as a prime candidate for COW. */
3051 sv_force_normal_flags(sv, 0);
3055 SvFLAGS(sv) |= mgs->mgs_flags;
3058 if (SvGMAGICAL(sv)) {
3059 /* downgrade public flags to private,
3060 and discard any other private flags */
3062 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3064 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3065 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3070 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3072 /* If we're still on top of the stack, pop us off. (That condition
3073 * will be satisfied if restore_magic was called explicitly, but *not*
3074 * if it's being called via leave_scope.)
3075 * The reason for doing this is that otherwise, things like sv_2cv()
3076 * may leave alloc gunk on the savestack, and some code
3077 * (e.g. sighandler) doesn't expect that...
3079 if (PL_savestack_ix == mgs->mgs_ss_ix)
3081 I32 popval = SSPOPINT;
3082 assert(popval == SAVEt_DESTRUCTOR_X);
3083 PL_savestack_ix -= 2;
3085 assert(popval == SAVEt_ALLOC);
3087 PL_savestack_ix -= popval;
3093 S_unwind_handler_stack(pTHX_ const void *p)
3096 const U32 flags = *(const U32*)p;
3098 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3101 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3102 #if !defined(PERL_IMPLICIT_CONTEXT)
3104 SvREFCNT_dec(PL_sig_sv);
3109 =for apidoc magic_sethint
3111 Triggered by a store to %^H, records the key/value pair to
3112 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3113 anything that would need a deep copy. Maybe we should warn if we find a
3119 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3122 SV *key = (mg->mg_len == HEf_SVKEY) ? (SV *)mg->mg_ptr
3123 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3125 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3127 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3128 an alternative leaf in there, with PL_compiling.cop_hints being used if
3129 it's NULL. If needed for threads, the alternative could lock a mutex,
3130 or take other more complex action. */
3132 /* Something changed in %^H, so it will need to be restored on scope exit.
3133 Doing this here saves a lot of doing it manually in perl code (and
3134 forgetting to do it, and consequent subtle errors. */
3135 PL_hints |= HINT_LOCALIZE_HH;
3136 PL_compiling.cop_hints_hash
3137 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
3142 =for apidoc magic_clearhint
3144 Triggered by a delete from %^H, records the key to
3145 C<PL_compiling.cop_hints_hash>.
3150 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3154 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3155 PERL_UNUSED_ARG(sv);
3157 assert(mg->mg_len == HEf_SVKEY);
3159 PERL_UNUSED_ARG(sv);
3161 PL_hints |= HINT_LOCALIZE_HH;
3162 PL_compiling.cop_hints_hash
3163 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3164 (SV *)mg->mg_ptr, &PL_sv_placeholder);
3170 * c-indentation-style: bsd
3172 * indent-tabs-mode: t
3175 * ex: set ts=8 sts=4 sw=4 noet: