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, ...);
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)
88 assert(SvMAGICAL(sv));
89 /* Turning READONLY off for a copy-on-write scalar (including shared
90 hash keys) is a bad idea. */
92 sv_force_normal_flags(sv, 0);
94 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
96 mgs = SSPTR(mgs_ix, MGS*);
98 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
99 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
103 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
104 /* No public flags are set, so promote any private flags to public. */
105 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
110 =for apidoc mg_magical
112 Turns on the magical status of an SV. See C<sv_magic>.
118 Perl_mg_magical(pTHX_ SV *sv)
122 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
123 const MGVTBL* const vtbl = mg->mg_virtual;
125 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
129 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
136 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
139 S_is_container_magic(const MAGIC *mg)
141 switch (mg->mg_type) {
144 case PERL_MAGIC_regex_global:
145 case PERL_MAGIC_nkeys:
146 #ifdef USE_LOCALE_COLLATE
147 case PERL_MAGIC_collxfrm:
150 case PERL_MAGIC_taint:
152 case PERL_MAGIC_vstring:
153 case PERL_MAGIC_utf8:
154 case PERL_MAGIC_substr:
155 case PERL_MAGIC_defelem:
156 case PERL_MAGIC_arylen:
158 case PERL_MAGIC_backref:
159 case PERL_MAGIC_arylen_p:
160 case PERL_MAGIC_rhash:
161 case PERL_MAGIC_symtab:
171 Do magic after a value is retrieved from the SV. See C<sv_magic>.
177 Perl_mg_get(pTHX_ SV *sv)
180 const I32 mgs_ix = SSNEW(sizeof(MGS));
181 const bool was_temp = (bool)SvTEMP(sv);
183 MAGIC *newmg, *head, *cur, *mg;
184 /* guard against sv having being freed midway by holding a private
187 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
188 cause the SV's buffer to get stolen (and maybe other stuff).
191 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
196 save_magic(mgs_ix, sv);
198 /* We must call svt_get(sv, mg) for each valid entry in the linked
199 list of magic. svt_get() may delete the current entry, add new
200 magic to the head of the list, or upgrade the SV. AMS 20010810 */
202 newmg = cur = head = mg = SvMAGIC(sv);
204 const MGVTBL * const vtbl = mg->mg_virtual;
206 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
207 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
209 /* guard against magic having been deleted - eg FETCH calling
214 /* Don't restore the flags for this entry if it was deleted. */
215 if (mg->mg_flags & MGf_GSKIP)
216 (SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
219 mg = mg->mg_moremagic;
222 /* Have we finished with the new entries we saw? Start again
223 where we left off (unless there are more new entries). */
231 /* Were any new entries added? */
232 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
239 restore_magic(INT2PTR(void *, (IV)mgs_ix));
241 if (SvREFCNT(sv) == 1) {
242 /* We hold the last reference to this SV, which implies that the
243 SV was deleted as a side effect of the routines we called. */
252 Do magic after a value is assigned to the SV. See C<sv_magic>.
258 Perl_mg_set(pTHX_ SV *sv)
261 const I32 mgs_ix = SSNEW(sizeof(MGS));
265 save_magic(mgs_ix, sv);
267 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
268 const MGVTBL* vtbl = mg->mg_virtual;
269 nextmg = mg->mg_moremagic; /* it may delete itself */
270 if (mg->mg_flags & MGf_GSKIP) {
271 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
272 (SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
274 if (PL_localizing == 2 && !S_is_container_magic(mg))
276 if (vtbl && vtbl->svt_set)
277 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
285 =for apidoc mg_length
287 Report on the SV's length. See C<sv_magic>.
293 Perl_mg_length(pTHX_ SV *sv)
299 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
300 const MGVTBL * const vtbl = mg->mg_virtual;
301 if (vtbl && vtbl->svt_len) {
302 const I32 mgs_ix = SSNEW(sizeof(MGS));
303 save_magic(mgs_ix, sv);
304 /* omit MGf_GSKIP -- not changed here */
305 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
306 restore_magic(INT2PTR(void*, (IV)mgs_ix));
312 const U8 *s = (U8*)SvPV_const(sv, len);
313 len = utf8_length(s, s + len);
316 (void)SvPV_const(sv, len);
321 Perl_mg_size(pTHX_ SV *sv)
325 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
326 const MGVTBL* const vtbl = mg->mg_virtual;
327 if (vtbl && vtbl->svt_len) {
328 const I32 mgs_ix = SSNEW(sizeof(MGS));
330 save_magic(mgs_ix, sv);
331 /* omit MGf_GSKIP -- not changed here */
332 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
333 restore_magic(INT2PTR(void*, (IV)mgs_ix));
340 return AvFILLp((AV *) sv); /* Fallback to non-tied array */
344 Perl_croak(aTHX_ "Size magic not implemented");
353 Clear something magical that the SV represents. See C<sv_magic>.
359 Perl_mg_clear(pTHX_ SV *sv)
361 const I32 mgs_ix = SSNEW(sizeof(MGS));
364 save_magic(mgs_ix, sv);
366 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
367 const MGVTBL* const vtbl = mg->mg_virtual;
368 /* omit GSKIP -- never set here */
370 if (vtbl && vtbl->svt_clear)
371 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
374 restore_magic(INT2PTR(void*, (IV)mgs_ix));
381 Finds the magic pointer for type matching the SV. See C<sv_magic>.
387 Perl_mg_find(pTHX_ const SV *sv, int type)
392 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
393 if (mg->mg_type == type)
403 Copies the magic from one SV to another. See C<sv_magic>.
409 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
413 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
414 const MGVTBL* const vtbl = mg->mg_virtual;
415 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
416 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
419 const char type = mg->mg_type;
420 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
422 (type == PERL_MAGIC_tied)
424 : (type == PERL_MAGIC_regdata && mg->mg_obj)
427 toLOWER(type), key, klen);
436 =for apidoc mg_localize
438 Copy some of the magic from an existing SV to new localized version of
439 that SV. Container magic (eg %ENV, $1, tie) gets copied, value magic
440 doesn't (eg taint, pos).
446 Perl_mg_localize(pTHX_ SV *sv, SV *nsv)
450 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
451 const MGVTBL* const vtbl = mg->mg_virtual;
452 if (!S_is_container_magic(mg))
455 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
456 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
458 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
459 mg->mg_ptr, mg->mg_len);
461 /* container types should remain read-only across localization */
462 SvFLAGS(nsv) |= SvREADONLY(sv);
465 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
466 SvFLAGS(nsv) |= SvMAGICAL(sv);
476 Free any magic storage used by the SV. See C<sv_magic>.
482 Perl_mg_free(pTHX_ SV *sv)
486 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
487 const MGVTBL* const vtbl = mg->mg_virtual;
488 moremagic = mg->mg_moremagic;
489 if (vtbl && vtbl->svt_free)
490 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
491 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
492 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
493 Safefree(mg->mg_ptr);
494 else if (mg->mg_len == HEf_SVKEY)
495 SvREFCNT_dec((SV*)mg->mg_ptr);
497 if (mg->mg_flags & MGf_REFCOUNTED)
498 SvREFCNT_dec(mg->mg_obj);
501 SvMAGIC_set(sv, NULL);
508 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
514 register const REGEXP * const rx = PM_GETRE(PL_curpm);
516 if (mg->mg_obj) { /* @+ */
517 /* return the number possible */
520 I32 paren = rx->lastparen;
522 /* return the last filled */
524 && (rx->offs[paren].start == -1
525 || rx->offs[paren].end == -1) )
536 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
540 register const REGEXP * const rx = PM_GETRE(PL_curpm);
542 register const I32 paren = mg->mg_len;
547 if (paren <= (I32)rx->nparens &&
548 (s = rx->offs[paren].start) != -1 &&
549 (t = rx->offs[paren].end) != -1)
552 if (mg->mg_obj) /* @+ */
557 if (i > 0 && RX_MATCH_UTF8(rx)) {
558 const char * const b = rx->subbeg;
560 i = utf8_length((U8*)b, (U8*)(b+i));
571 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
575 Perl_croak(aTHX_ PL_no_modify);
576 NORETURN_FUNCTION_END;
580 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
585 register const REGEXP * rx;
586 const char * const remaining = mg->mg_ptr + 1;
588 switch (*mg->mg_ptr) {
590 if (*remaining == '\0') { /* ^P */
592 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
594 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
598 case '\015': /* $^MATCH */
599 if (strEQ(remaining, "ATCH")) {
616 case '1': case '2': case '3': case '4':
617 case '5': case '6': case '7': case '8': case '9':
618 paren = atoi(mg->mg_ptr);
620 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
622 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
625 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
628 if (ckWARN(WARN_UNINITIALIZED))
633 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
634 paren = rx->lastparen;
639 case '\016': /* ^N */
640 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
641 paren = rx->lastcloseparen;
648 if (!SvPOK(sv) && SvNIOK(sv)) {
656 #define SvRTRIM(sv) STMT_START { \
658 STRLEN len = SvCUR(sv); \
659 char * const p = SvPVX(sv); \
660 while (len > 0 && isSPACE(p[len-1])) \
662 SvCUR_set(sv, len); \
668 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
670 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
671 sv_setsv(sv, &PL_sv_undef);
675 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
676 SV *const value = Perl_refcounted_he_fetch(aTHX_
678 0, "open<", 5, 0, 0);
683 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
684 SV *const value = Perl_refcounted_he_fetch(aTHX_
686 0, "open>", 5, 0, 0);
694 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
698 register char *s = NULL;
700 const char * const remaining = mg->mg_ptr + 1;
701 const char nextchar = *remaining;
703 switch (*mg->mg_ptr) {
704 case '\001': /* ^A */
705 sv_setsv(sv, PL_bodytarget);
707 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
708 if (nextchar == '\0') {
709 sv_setiv(sv, (IV)PL_minus_c);
711 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
712 sv_setiv(sv, (IV)STATUS_NATIVE);
716 case '\004': /* ^D */
717 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
719 case '\005': /* ^E */
720 if (nextchar == '\0') {
721 #if defined(MACOS_TRADITIONAL)
725 sv_setnv(sv,(double)gMacPerl_OSErr);
726 sv_setpv(sv, gMacPerl_OSErr ? GetSysErrText(gMacPerl_OSErr, msg) : "");
730 # include <descrip.h>
731 # include <starlet.h>
733 $DESCRIPTOR(msgdsc,msg);
734 sv_setnv(sv,(NV) vaxc$errno);
735 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
736 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
741 if (!(_emx_env & 0x200)) { /* Under DOS */
742 sv_setnv(sv, (NV)errno);
743 sv_setpv(sv, errno ? Strerror(errno) : "");
745 if (errno != errno_isOS2) {
746 const int tmp = _syserrno();
747 if (tmp) /* 2nd call to _syserrno() makes it 0 */
750 sv_setnv(sv, (NV)Perl_rc);
751 sv_setpv(sv, os2error(Perl_rc));
755 const DWORD dwErr = GetLastError();
756 sv_setnv(sv, (NV)dwErr);
758 PerlProc_GetOSError(sv, dwErr);
761 sv_setpvn(sv, "", 0);
766 const int saveerrno = errno;
767 sv_setnv(sv, (NV)errno);
768 sv_setpv(sv, errno ? Strerror(errno) : "");
773 SvNOK_on(sv); /* what a wonderful hack! */
775 else if (strEQ(remaining, "NCODING"))
776 sv_setsv(sv, PL_encoding);
778 case '\006': /* ^F */
779 sv_setiv(sv, (IV)PL_maxsysfd);
781 case '\010': /* ^H */
782 sv_setiv(sv, (IV)PL_hints);
784 case '\011': /* ^I */ /* NOT \t in EBCDIC */
786 sv_setpv(sv, PL_inplace);
788 sv_setsv(sv, &PL_sv_undef);
790 case '\017': /* ^O & ^OPEN */
791 if (nextchar == '\0') {
792 sv_setpv(sv, PL_osname);
795 else if (strEQ(remaining, "PEN")) {
796 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
800 if (nextchar == '\0') { /* ^P */
801 sv_setiv(sv, (IV)PL_perldb);
802 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
803 goto do_prematch_fetch;
804 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
805 goto do_postmatch_fetch;
808 case '\023': /* ^S */
809 if (nextchar == '\0') {
810 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
813 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
818 case '\024': /* ^T */
819 if (nextchar == '\0') {
821 sv_setnv(sv, PL_basetime);
823 sv_setiv(sv, (IV)PL_basetime);
826 else if (strEQ(remaining, "AINT"))
827 sv_setiv(sv, PL_tainting
828 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
831 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
832 if (strEQ(remaining, "NICODE"))
833 sv_setuv(sv, (UV) PL_unicode);
834 else if (strEQ(remaining, "TF8LOCALE"))
835 sv_setuv(sv, (UV) PL_utf8locale);
836 else if (strEQ(remaining, "TF8CACHE"))
837 sv_setiv(sv, (IV) PL_utf8cache);
839 case '\027': /* ^W & $^WARNING_BITS */
840 if (nextchar == '\0')
841 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
842 else if (strEQ(remaining, "ARNING_BITS")) {
843 if (PL_compiling.cop_warnings == pWARN_NONE) {
844 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
846 else if (PL_compiling.cop_warnings == pWARN_STD) {
849 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
853 else if (PL_compiling.cop_warnings == pWARN_ALL) {
854 /* Get the bit mask for $warnings::Bits{all}, because
855 * it could have been extended by warnings::register */
856 HV * const bits=get_hv("warnings::Bits", FALSE);
858 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
860 sv_setsv(sv, *bits_all);
863 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
867 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
868 *PL_compiling.cop_warnings);
873 case '\015': /* $^MATCH */
874 if (strEQ(remaining, "ATCH")) {
875 case '1': case '2': case '3': case '4':
876 case '5': case '6': case '7': case '8': case '9': case '&':
877 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
879 * Pre-threads, this was paren = atoi(GvENAME((GV*)mg->mg_obj));
880 * XXX Does the new way break anything?
882 paren = atoi(mg->mg_ptr); /* $& is in [0] */
883 CALLREG_NUMBUF_FETCH(rx,paren,sv);
886 sv_setsv(sv,&PL_sv_undef);
890 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
892 CALLREG_NUMBUF_FETCH(rx,rx->lastparen,sv);
896 sv_setsv(sv,&PL_sv_undef);
898 case '\016': /* ^N */
899 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
900 if (rx->lastcloseparen) {
901 CALLREG_NUMBUF_FETCH(rx,rx->lastcloseparen,sv);
906 sv_setsv(sv,&PL_sv_undef);
910 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
911 CALLREG_NUMBUF_FETCH(rx,-2,sv);
914 sv_setsv(sv,&PL_sv_undef);
918 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
919 CALLREG_NUMBUF_FETCH(rx,-1,sv);
922 sv_setsv(sv,&PL_sv_undef);
925 if (GvIO(PL_last_in_gv)) {
926 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
931 sv_setiv(sv, (IV)STATUS_CURRENT);
932 #ifdef COMPLEX_STATUS
933 LvTARGOFF(sv) = PL_statusvalue;
934 LvTARGLEN(sv) = PL_statusvalue_vms;
939 if (GvIOp(PL_defoutgv))
940 s = IoTOP_NAME(GvIOp(PL_defoutgv));
944 sv_setpv(sv,GvENAME(PL_defoutgv));
949 if (GvIOp(PL_defoutgv))
950 s = IoFMT_NAME(GvIOp(PL_defoutgv));
952 s = GvENAME(PL_defoutgv);
956 if (GvIOp(PL_defoutgv))
957 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
960 if (GvIOp(PL_defoutgv))
961 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
964 if (GvIOp(PL_defoutgv))
965 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
972 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
975 if (GvIOp(PL_defoutgv))
976 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
982 sv_copypv(sv, PL_ors_sv);
986 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
987 sv_setpv(sv, errno ? Strerror(errno) : "");
990 const int saveerrno = errno;
991 sv_setnv(sv, (NV)errno);
993 if (errno == errno_isOS2 || errno == errno_isOS2_set)
994 sv_setpv(sv, os2error(Perl_rc));
997 sv_setpv(sv, errno ? Strerror(errno) : "");
1002 SvNOK_on(sv); /* what a wonderful hack! */
1005 sv_setiv(sv, (IV)PL_uid);
1008 sv_setiv(sv, (IV)PL_euid);
1011 sv_setiv(sv, (IV)PL_gid);
1014 sv_setiv(sv, (IV)PL_egid);
1016 #ifdef HAS_GETGROUPS
1018 Groups_t *gary = NULL;
1019 I32 i, num_groups = getgroups(0, gary);
1020 Newx(gary, num_groups, Groups_t);
1021 num_groups = getgroups(num_groups, gary);
1022 for (i = 0; i < num_groups; i++)
1023 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1026 (void)SvIOK_on(sv); /* what a wonderful hack! */
1029 #ifndef MACOS_TRADITIONAL
1038 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1040 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1042 if (uf && uf->uf_val)
1043 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1048 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1051 STRLEN len = 0, klen;
1052 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1053 const char * const ptr = MgPV_const(mg,klen);
1056 #ifdef DYNAMIC_ENV_FETCH
1057 /* We just undefd an environment var. Is a replacement */
1058 /* waiting in the wings? */
1060 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1062 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1066 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1067 /* And you'll never guess what the dog had */
1068 /* in its mouth... */
1070 MgTAINTEDDIR_off(mg);
1072 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1073 char pathbuf[256], eltbuf[256], *cp, *elt;
1077 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1079 do { /* DCL$PATH may be a search list */
1080 while (1) { /* as may dev portion of any element */
1081 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1082 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1083 cando_by_name(S_IWUSR,0,elt) ) {
1084 MgTAINTEDDIR_on(mg);
1088 if ((cp = strchr(elt, ':')) != NULL)
1090 if (my_trnlnm(elt, eltbuf, j++))
1096 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1099 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1100 const char * const strend = s + len;
1102 while (s < strend) {
1106 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1107 const char path_sep = '|';
1109 const char path_sep = ':';
1111 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1112 s, strend, path_sep, &i);
1114 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1116 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1118 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1120 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1121 MgTAINTEDDIR_on(mg);
1127 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1133 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1135 PERL_UNUSED_ARG(sv);
1136 my_setenv(MgPV_nolen_const(mg),NULL);
1141 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1144 PERL_UNUSED_ARG(mg);
1146 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1148 if (PL_localizing) {
1151 hv_iterinit((HV*)sv);
1152 while ((entry = hv_iternext((HV*)sv))) {
1154 my_setenv(hv_iterkey(entry, &keylen),
1155 SvPV_nolen_const(hv_iterval((HV*)sv, entry)));
1163 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1166 PERL_UNUSED_ARG(sv);
1167 PERL_UNUSED_ARG(mg);
1169 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1177 #ifdef HAS_SIGPROCMASK
1179 restore_sigmask(pTHX_ SV *save_sv)
1181 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1182 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1186 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1189 /* Are we fetching a signal entry? */
1190 const I32 i = whichsig(MgPV_nolen_const(mg));
1193 sv_setsv(sv,PL_psig_ptr[i]);
1195 Sighandler_t sigstate = rsignal_state(i);
1196 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1197 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1200 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1201 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1204 /* cache state so we don't fetch it again */
1205 if(sigstate == (Sighandler_t) SIG_IGN)
1206 sv_setpvs(sv,"IGNORE");
1208 sv_setsv(sv,&PL_sv_undef);
1209 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1216 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1218 /* XXX Some of this code was copied from Perl_magic_setsig. A little
1219 * refactoring might be in order.
1222 register const char * const s = MgPV_nolen_const(mg);
1223 PERL_UNUSED_ARG(sv);
1226 if (strEQ(s,"__DIE__"))
1228 else if (strEQ(s,"__WARN__") && PL_warnhook != PERL_WARNHOOK_FATAL)
1231 SV *const to_dec = *svp;
1233 SvREFCNT_dec(to_dec);
1237 /* Are we clearing a signal entry? */
1238 const I32 i = whichsig(s);
1240 #ifdef HAS_SIGPROCMASK
1243 /* Avoid having the signal arrive at a bad time, if possible. */
1246 sigprocmask(SIG_BLOCK, &set, &save);
1248 save_sv = newSVpv((char *)(&save), sizeof(sigset_t));
1249 SAVEFREESV(save_sv);
1250 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1253 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1254 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1256 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1257 PL_sig_defaulting[i] = 1;
1258 (void)rsignal(i, PL_csighandlerp);
1260 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1262 if(PL_psig_name[i]) {
1263 SvREFCNT_dec(PL_psig_name[i]);
1266 if(PL_psig_ptr[i]) {
1267 SV * const to_dec=PL_psig_ptr[i];
1270 SvREFCNT_dec(to_dec);
1280 * The signal handling nomenclature has gotten a bit confusing since the advent of
1281 * safe signals. S_raise_signal only raises signals by analogy with what the
1282 * underlying system's signal mechanism does. It might be more proper to say that
1283 * it defers signals that have already been raised and caught.
1285 * PL_sig_pending and PL_psig_pend likewise do not track signals that are pending
1286 * in the sense of being on the system's signal queue in between raising and delivery.
1287 * They are only pending on Perl's deferral list, i.e., they track deferred signals
1288 * awaiting delivery after the current Perl opcode completes and say nothing about
1289 * signals raised but not yet caught in the underlying signal implementation.
1292 #ifndef SIG_PENDING_DIE_COUNT
1293 # define SIG_PENDING_DIE_COUNT 120
1297 S_raise_signal(pTHX_ int sig)
1300 /* Set a flag to say this signal is pending */
1301 PL_psig_pend[sig]++;
1302 /* And one to say _a_ signal is pending */
1303 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1304 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1305 (unsigned long)SIG_PENDING_DIE_COUNT);
1309 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1310 Perl_csighandler(int sig, ...)
1312 Perl_csighandler(int sig)
1315 #ifdef PERL_GET_SIG_CONTEXT
1316 dTHXa(PERL_GET_SIG_CONTEXT);
1320 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1321 (void) rsignal(sig, PL_csighandlerp);
1322 if (PL_sig_ignoring[sig]) return;
1324 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1325 if (PL_sig_defaulting[sig])
1326 #ifdef KILL_BY_SIGPRC
1327 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1342 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1343 /* Call the perl level handler now--
1344 * with risk we may be in malloc() etc. */
1345 (*PL_sighandlerp)(sig);
1347 S_raise_signal(aTHX_ sig);
1350 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1352 Perl_csighandler_init(void)
1355 if (PL_sig_handlers_initted) return;
1357 for (sig = 1; sig < SIG_SIZE; sig++) {
1358 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1360 PL_sig_defaulting[sig] = 1;
1361 (void) rsignal(sig, PL_csighandlerp);
1363 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1364 PL_sig_ignoring[sig] = 0;
1367 PL_sig_handlers_initted = 1;
1372 Perl_despatch_signals(pTHX)
1377 for (sig = 1; sig < SIG_SIZE; sig++) {
1378 if (PL_psig_pend[sig]) {
1379 PERL_BLOCKSIG_ADD(set, sig);
1380 PL_psig_pend[sig] = 0;
1381 PERL_BLOCKSIG_BLOCK(set);
1382 (*PL_sighandlerp)(sig);
1383 PERL_BLOCKSIG_UNBLOCK(set);
1389 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1394 /* Need to be careful with SvREFCNT_dec(), because that can have side
1395 * effects (due to closures). We must make sure that the new disposition
1396 * is in place before it is called.
1400 #ifdef HAS_SIGPROCMASK
1405 register const char *s = MgPV_const(mg,len);
1407 if (strEQ(s,"__DIE__"))
1409 else if (strEQ(s,"__WARN__"))
1412 Perl_croak(aTHX_ "No such hook: %s", s);
1415 if (*svp != PERL_WARNHOOK_FATAL)
1421 i = whichsig(s); /* ...no, a brick */
1423 if (ckWARN(WARN_SIGNAL))
1424 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1427 #ifdef HAS_SIGPROCMASK
1428 /* Avoid having the signal arrive at a bad time, if possible. */
1431 sigprocmask(SIG_BLOCK, &set, &save);
1433 save_sv = newSVpv((char *)(&save), sizeof(sigset_t));
1434 SAVEFREESV(save_sv);
1435 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1438 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1439 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1441 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1442 PL_sig_ignoring[i] = 0;
1444 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1445 PL_sig_defaulting[i] = 0;
1447 SvREFCNT_dec(PL_psig_name[i]);
1448 to_dec = PL_psig_ptr[i];
1449 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1450 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1451 PL_psig_name[i] = newSVpvn(s, len);
1452 SvREADONLY_on(PL_psig_name[i]);
1454 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
1456 (void)rsignal(i, PL_csighandlerp);
1457 #ifdef HAS_SIGPROCMASK
1462 *svp = SvREFCNT_inc_simple_NN(sv);
1464 SvREFCNT_dec(to_dec);
1467 s = SvOK(sv) ? SvPV_force(sv,len) : "DEFAULT";
1468 if (strEQ(s,"IGNORE")) {
1470 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1471 PL_sig_ignoring[i] = 1;
1472 (void)rsignal(i, PL_csighandlerp);
1474 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1478 else if (strEQ(s,"DEFAULT") || !*s) {
1480 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1482 PL_sig_defaulting[i] = 1;
1483 (void)rsignal(i, PL_csighandlerp);
1486 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1491 * We should warn if HINT_STRICT_REFS, but without
1492 * access to a known hint bit in a known OP, we can't
1493 * tell whether HINT_STRICT_REFS is in force or not.
1495 if (!strchr(s,':') && !strchr(s,'\''))
1496 Perl_sv_insert(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"));
1498 (void)rsignal(i, PL_csighandlerp);
1500 *svp = SvREFCNT_inc_simple_NN(sv);
1502 #ifdef HAS_SIGPROCMASK
1507 SvREFCNT_dec(to_dec);
1510 #endif /* !PERL_MICRO */
1513 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1517 PERL_UNUSED_ARG(sv);
1519 /* Bail out if destruction is going on */
1520 if(PL_dirty) return 0;
1522 /* The first case occurs via setisa,
1523 the second via setisa_elem, which
1524 calls this same magic */
1526 SvTYPE(mg->mg_obj) == SVt_PVGV
1528 : (GV*)SvMAGIC(mg->mg_obj)->mg_obj
1532 PL_delayedisa = stash;
1534 mro_isa_changed_in(stash);
1540 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1543 PERL_UNUSED_ARG(sv);
1544 PERL_UNUSED_ARG(mg);
1545 PL_amagic_generation++;
1551 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1553 HV * const hv = (HV*)LvTARG(sv);
1555 PERL_UNUSED_ARG(mg);
1558 (void) hv_iterinit(hv);
1559 if (! SvTIED_mg((SV*)hv, PERL_MAGIC_tied))
1562 while (hv_iternext(hv))
1567 sv_setiv(sv, (IV)i);
1572 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1574 PERL_UNUSED_ARG(mg);
1576 hv_ksplit((HV*)LvTARG(sv), SvIV(sv));
1581 /* caller is responsible for stack switching/cleanup */
1583 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1590 PUSHs(SvTIED_obj(sv, mg));
1593 if (mg->mg_len >= 0)
1594 PUSHs(sv_2mortal(newSVpvn(mg->mg_ptr, mg->mg_len)));
1595 else if (mg->mg_len == HEf_SVKEY)
1596 PUSHs((SV*)mg->mg_ptr);
1598 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1599 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
1607 return call_method(meth, flags);
1611 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1617 PUSHSTACKi(PERLSI_MAGIC);
1619 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1620 sv_setsv(sv, *PL_stack_sp--);
1630 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1633 mg->mg_flags |= MGf_GSKIP;
1634 magic_methpack(sv,mg,"FETCH");
1639 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1643 PUSHSTACKi(PERLSI_MAGIC);
1644 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1651 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1653 return magic_methpack(sv,mg,"DELETE");
1658 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1665 PUSHSTACKi(PERLSI_MAGIC);
1666 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1667 sv = *PL_stack_sp--;
1668 retval = SvIV(sv)-1;
1670 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1675 return (U32) retval;
1679 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1684 PUSHSTACKi(PERLSI_MAGIC);
1686 XPUSHs(SvTIED_obj(sv, mg));
1688 call_method("CLEAR", G_SCALAR|G_DISCARD);
1696 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1699 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1703 PUSHSTACKi(PERLSI_MAGIC);
1706 PUSHs(SvTIED_obj(sv, mg));
1711 if (call_method(meth, G_SCALAR))
1712 sv_setsv(key, *PL_stack_sp--);
1721 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1723 return magic_methpack(sv,mg,"EXISTS");
1727 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1731 SV * const tied = SvTIED_obj((SV*)hv, mg);
1732 HV * const pkg = SvSTASH((SV*)SvRV(tied));
1734 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1736 if (HvEITER_get(hv))
1737 /* we are in an iteration so the hash cannot be empty */
1739 /* no xhv_eiter so now use FIRSTKEY */
1740 key = sv_newmortal();
1741 magic_nextpack((SV*)hv, mg, key);
1742 HvEITER_set(hv, NULL); /* need to reset iterator */
1743 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1746 /* there is a SCALAR method that we can call */
1748 PUSHSTACKi(PERLSI_MAGIC);
1754 if (call_method("SCALAR", G_SCALAR))
1755 retval = *PL_stack_sp--;
1757 retval = &PL_sv_undef;
1764 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1767 GV * const gv = PL_DBline;
1768 const I32 i = SvTRUE(sv);
1769 SV ** const svp = av_fetch(GvAV(gv),
1770 atoi(MgPV_nolen_const(mg)), FALSE);
1771 if (svp && SvIOKp(*svp)) {
1772 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1774 /* set or clear breakpoint in the relevant control op */
1776 o->op_flags |= OPf_SPECIAL;
1778 o->op_flags &= ~OPf_SPECIAL;
1785 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1788 const AV * const obj = (AV*)mg->mg_obj;
1790 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
1798 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1801 AV * const obj = (AV*)mg->mg_obj;
1803 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
1805 if (ckWARN(WARN_MISC))
1806 Perl_warner(aTHX_ packWARN(WARN_MISC),
1807 "Attempt to set length of freed array");
1813 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1816 PERL_UNUSED_ARG(sv);
1817 /* during global destruction, mg_obj may already have been freed */
1818 if (PL_in_clean_all)
1821 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1824 /* arylen scalar holds a pointer back to the array, but doesn't own a
1825 reference. Hence the we (the array) are about to go away with it
1826 still pointing at us. Clear its pointer, else it would be pointing
1827 at free memory. See the comment in sv_magic about reference loops,
1828 and why it can't own a reference to us. */
1835 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1838 SV* const lsv = LvTARG(sv);
1839 PERL_UNUSED_ARG(mg);
1841 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1842 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1843 if (found && found->mg_len >= 0) {
1844 I32 i = found->mg_len;
1846 sv_pos_b2u(lsv, &i);
1847 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
1856 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1859 SV* const lsv = LvTARG(sv);
1865 PERL_UNUSED_ARG(mg);
1867 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1868 found = mg_find(lsv, PERL_MAGIC_regex_global);
1874 #ifdef PERL_OLD_COPY_ON_WRITE
1876 sv_force_normal_flags(lsv, 0);
1878 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
1881 else if (!SvOK(sv)) {
1885 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1887 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
1890 ulen = sv_len_utf8(lsv);
1900 else if (pos > (SSize_t)len)
1905 sv_pos_u2b(lsv, &p, 0);
1909 found->mg_len = pos;
1910 found->mg_flags &= ~MGf_MINMATCH;
1916 Perl_magic_setglob(pTHX_ SV *sv, MAGIC *mg)
1919 PERL_UNUSED_ARG(mg);
1921 Perl_croak(aTHX_ "Perl_magic_setglob is dead code?");
1925 if (isGV_with_GP(sv)) {
1926 /* We're actually already a typeglob, so don't need the stuff below.
1930 gv = gv_fetchsv(sv, GV_ADD, SVt_PVGV);
1935 GvGP(sv) = gp_ref(GvGP(gv));
1940 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
1943 SV * const lsv = LvTARG(sv);
1944 const char * const tmps = SvPV_const(lsv,len);
1945 I32 offs = LvTARGOFF(sv);
1946 I32 rem = LvTARGLEN(sv);
1947 PERL_UNUSED_ARG(mg);
1950 sv_pos_u2b(lsv, &offs, &rem);
1951 if (offs > (I32)len)
1953 if (rem + offs > (I32)len)
1955 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
1962 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
1966 const char * const tmps = SvPV_const(sv, len);
1967 SV * const lsv = LvTARG(sv);
1968 I32 lvoff = LvTARGOFF(sv);
1969 I32 lvlen = LvTARGLEN(sv);
1970 PERL_UNUSED_ARG(mg);
1973 sv_utf8_upgrade(lsv);
1974 sv_pos_u2b(lsv, &lvoff, &lvlen);
1975 sv_insert(lsv, lvoff, lvlen, tmps, len);
1976 LvTARGLEN(sv) = sv_len_utf8(sv);
1979 else if (lsv && SvUTF8(lsv)) {
1981 sv_pos_u2b(lsv, &lvoff, &lvlen);
1982 LvTARGLEN(sv) = len;
1983 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
1984 sv_insert(lsv, lvoff, lvlen, utf8, len);
1988 sv_insert(lsv, lvoff, lvlen, tmps, len);
1989 LvTARGLEN(sv) = len;
1997 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2000 PERL_UNUSED_ARG(sv);
2001 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2006 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2009 PERL_UNUSED_ARG(sv);
2010 /* update taint status */
2019 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2021 SV * const lsv = LvTARG(sv);
2022 PERL_UNUSED_ARG(mg);
2025 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2033 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2035 PERL_UNUSED_ARG(mg);
2036 do_vecset(sv); /* XXX slurp this routine */
2041 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2045 if (LvTARGLEN(sv)) {
2047 SV * const ahv = LvTARG(sv);
2048 HE * const he = hv_fetch_ent((HV*)ahv, mg->mg_obj, FALSE, 0);
2053 AV* const av = (AV*)LvTARG(sv);
2054 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2055 targ = AvARRAY(av)[LvTARGOFF(sv)];
2057 if (targ && (targ != &PL_sv_undef)) {
2058 /* somebody else defined it for us */
2059 SvREFCNT_dec(LvTARG(sv));
2060 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2062 SvREFCNT_dec(mg->mg_obj);
2064 mg->mg_flags &= ~MGf_REFCOUNTED;
2069 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2074 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2076 PERL_UNUSED_ARG(mg);
2080 sv_setsv(LvTARG(sv), sv);
2081 SvSETMAGIC(LvTARG(sv));
2087 Perl_vivify_defelem(pTHX_ SV *sv)
2093 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2096 SV * const ahv = LvTARG(sv);
2097 HE * const he = hv_fetch_ent((HV*)ahv, mg->mg_obj, TRUE, 0);
2100 if (!value || value == &PL_sv_undef)
2101 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2104 AV* const av = (AV*)LvTARG(sv);
2105 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2106 LvTARG(sv) = NULL; /* array can't be extended */
2108 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2109 if (!svp || (value = *svp) == &PL_sv_undef)
2110 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2113 SvREFCNT_inc_simple_void(value);
2114 SvREFCNT_dec(LvTARG(sv));
2117 SvREFCNT_dec(mg->mg_obj);
2119 mg->mg_flags &= ~MGf_REFCOUNTED;
2123 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2125 return Perl_sv_kill_backrefs(aTHX_ sv, (AV*)mg->mg_obj);
2129 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2131 PERL_UNUSED_CONTEXT;
2138 Perl_magic_setbm(pTHX_ SV *sv, MAGIC *mg)
2140 PERL_UNUSED_ARG(mg);
2141 sv_unmagic(sv, PERL_MAGIC_bm);
2148 Perl_magic_setfm(pTHX_ SV *sv, MAGIC *mg)
2150 PERL_UNUSED_ARG(mg);
2151 sv_unmagic(sv, PERL_MAGIC_fm);
2157 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2159 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2161 if (uf && uf->uf_set)
2162 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2167 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2169 PERL_UNUSED_ARG(mg);
2170 sv_unmagic(sv, PERL_MAGIC_qr);
2175 Perl_magic_freeregexp(pTHX_ SV *sv, MAGIC *mg)
2178 regexp * const re = (regexp *)mg->mg_obj;
2179 PERL_UNUSED_ARG(sv);
2185 #ifdef USE_LOCALE_COLLATE
2187 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2190 * RenE<eacute> Descartes said "I think not."
2191 * and vanished with a faint plop.
2193 PERL_UNUSED_CONTEXT;
2194 PERL_UNUSED_ARG(sv);
2196 Safefree(mg->mg_ptr);
2202 #endif /* USE_LOCALE_COLLATE */
2204 /* Just clear the UTF-8 cache data. */
2206 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2208 PERL_UNUSED_CONTEXT;
2209 PERL_UNUSED_ARG(sv);
2210 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2212 mg->mg_len = -1; /* The mg_len holds the len cache. */
2217 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2220 register const char *s;
2222 register const REGEXP * rx;
2223 const char * const remaining = mg->mg_ptr + 1;
2227 switch (*mg->mg_ptr) {
2228 case '\015': /* $^MATCH */
2229 if (strEQ(remaining, "ATCH"))
2231 case '`': /* ${^PREMATCH} caught below */
2235 case '\'': /* ${^POSTMATCH} caught below */
2243 case '1': case '2': case '3': case '4':
2244 case '5': case '6': case '7': case '8': case '9':
2245 paren = atoi(mg->mg_ptr);
2247 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2248 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2251 /* Croak with a READONLY error when a numbered match var is
2252 * set without a previous pattern match. Unless it's C<local $1>
2254 if (!PL_localizing) {
2255 Perl_croak(aTHX_ PL_no_modify);
2258 case '\001': /* ^A */
2259 sv_setsv(PL_bodytarget, sv);
2261 case '\003': /* ^C */
2262 PL_minus_c = (bool)SvIV(sv);
2265 case '\004': /* ^D */
2267 s = SvPV_nolen_const(sv);
2268 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2269 DEBUG_x(dump_all());
2271 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2274 case '\005': /* ^E */
2275 if (*(mg->mg_ptr+1) == '\0') {
2276 #ifdef MACOS_TRADITIONAL
2277 gMacPerl_OSErr = SvIV(sv);
2280 set_vaxc_errno(SvIV(sv));
2283 SetLastError( SvIV(sv) );
2286 os2_setsyserrno(SvIV(sv));
2288 /* will anyone ever use this? */
2289 SETERRNO(SvIV(sv), 4);
2295 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2297 SvREFCNT_dec(PL_encoding);
2298 if (SvOK(sv) || SvGMAGICAL(sv)) {
2299 PL_encoding = newSVsv(sv);
2306 case '\006': /* ^F */
2307 PL_maxsysfd = SvIV(sv);
2309 case '\010': /* ^H */
2310 PL_hints = SvIV(sv);
2312 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2313 Safefree(PL_inplace);
2314 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2316 case '\017': /* ^O */
2317 if (*(mg->mg_ptr+1) == '\0') {
2318 Safefree(PL_osname);
2321 TAINT_PROPER("assigning to $^O");
2322 PL_osname = savesvpv(sv);
2325 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2327 const char *const start = SvPV(sv, len);
2328 const char *out = (const char*)memchr(start, '\0', len);
2330 struct refcounted_he *tmp_he;
2333 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2335 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2337 /* Opening for input is more common than opening for output, so
2338 ensure that hints for input are sooner on linked list. */
2339 tmp = sv_2mortal(out ? newSVpvn(out + 1, start + len - out - 1)
2341 SvFLAGS(tmp) |= SvUTF8(sv);
2344 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
2345 sv_2mortal(newSVpvs("open>")), tmp);
2347 /* The UTF-8 setting is carried over */
2348 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2350 PL_compiling.cop_hints_hash
2351 = Perl_refcounted_he_new(aTHX_ tmp_he,
2352 sv_2mortal(newSVpvs("open<")), tmp);
2355 case '\020': /* ^P */
2356 if (*remaining == '\0') { /* ^P */
2357 PL_perldb = SvIV(sv);
2358 if (PL_perldb && !PL_DBsingle)
2361 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2363 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2366 case '\024': /* ^T */
2368 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2370 PL_basetime = (Time_t)SvIV(sv);
2373 case '\025': /* ^UTF8CACHE */
2374 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2375 PL_utf8cache = (signed char) sv_2iv(sv);
2378 case '\027': /* ^W & $^WARNING_BITS */
2379 if (*(mg->mg_ptr+1) == '\0') {
2380 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2382 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2383 | (i ? G_WARN_ON : G_WARN_OFF) ;
2386 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2387 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2388 if (!SvPOK(sv) && PL_localizing) {
2389 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2390 PL_compiling.cop_warnings = pWARN_NONE;
2395 int accumulate = 0 ;
2396 int any_fatals = 0 ;
2397 const char * const ptr = SvPV_const(sv, len) ;
2398 for (i = 0 ; i < len ; ++i) {
2399 accumulate |= ptr[i] ;
2400 any_fatals |= (ptr[i] & 0xAA) ;
2403 if (!specialWARN(PL_compiling.cop_warnings))
2404 PerlMemShared_free(PL_compiling.cop_warnings);
2405 PL_compiling.cop_warnings = pWARN_NONE;
2407 /* Yuck. I can't see how to abstract this: */
2408 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2409 WARN_ALL) && !any_fatals) {
2410 if (!specialWARN(PL_compiling.cop_warnings))
2411 PerlMemShared_free(PL_compiling.cop_warnings);
2412 PL_compiling.cop_warnings = pWARN_ALL;
2413 PL_dowarn |= G_WARN_ONCE ;
2417 const char *const p = SvPV_const(sv, len);
2419 PL_compiling.cop_warnings
2420 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2423 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2424 PL_dowarn |= G_WARN_ONCE ;
2432 if (PL_localizing) {
2433 if (PL_localizing == 1)
2434 SAVESPTR(PL_last_in_gv);
2436 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2437 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2440 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2441 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2442 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2445 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2446 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2447 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2450 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2453 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2454 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2455 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2458 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2462 IO * const io = GvIOp(PL_defoutgv);
2465 if ((SvIV(sv)) == 0)
2466 IoFLAGS(io) &= ~IOf_FLUSH;
2468 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2469 PerlIO *ofp = IoOFP(io);
2471 (void)PerlIO_flush(ofp);
2472 IoFLAGS(io) |= IOf_FLUSH;
2478 SvREFCNT_dec(PL_rs);
2479 PL_rs = newSVsv(sv);
2483 SvREFCNT_dec(PL_ors_sv);
2484 if (SvOK(sv) || SvGMAGICAL(sv)) {
2485 PL_ors_sv = newSVsv(sv);
2493 SvREFCNT_dec(PL_ofs_sv);
2494 if (SvOK(sv) || SvGMAGICAL(sv)) {
2495 PL_ofs_sv = newSVsv(sv);
2502 CopARYBASE_set(&PL_compiling, SvIV(sv));
2505 #ifdef COMPLEX_STATUS
2506 if (PL_localizing == 2) {
2507 PL_statusvalue = LvTARGOFF(sv);
2508 PL_statusvalue_vms = LvTARGLEN(sv);
2512 #ifdef VMSISH_STATUS
2514 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2517 STATUS_UNIX_EXIT_SET(SvIV(sv));
2522 # define PERL_VMS_BANG vaxc$errno
2524 # define PERL_VMS_BANG 0
2526 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2527 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2532 if (PL_delaymagic) {
2533 PL_delaymagic |= DM_RUID;
2534 break; /* don't do magic till later */
2537 (void)setruid((Uid_t)PL_uid);
2540 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2542 #ifdef HAS_SETRESUID
2543 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2545 if (PL_uid == PL_euid) { /* special case $< = $> */
2547 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2548 if (PL_uid != 0 && PerlProc_getuid() == 0)
2549 (void)PerlProc_setuid(0);
2551 (void)PerlProc_setuid(PL_uid);
2553 PL_uid = PerlProc_getuid();
2554 Perl_croak(aTHX_ "setruid() not implemented");
2559 PL_uid = PerlProc_getuid();
2560 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2564 if (PL_delaymagic) {
2565 PL_delaymagic |= DM_EUID;
2566 break; /* don't do magic till later */
2569 (void)seteuid((Uid_t)PL_euid);
2572 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2574 #ifdef HAS_SETRESUID
2575 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2577 if (PL_euid == PL_uid) /* special case $> = $< */
2578 PerlProc_setuid(PL_euid);
2580 PL_euid = PerlProc_geteuid();
2581 Perl_croak(aTHX_ "seteuid() not implemented");
2586 PL_euid = PerlProc_geteuid();
2587 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2591 if (PL_delaymagic) {
2592 PL_delaymagic |= DM_RGID;
2593 break; /* don't do magic till later */
2596 (void)setrgid((Gid_t)PL_gid);
2599 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2601 #ifdef HAS_SETRESGID
2602 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2604 if (PL_gid == PL_egid) /* special case $( = $) */
2605 (void)PerlProc_setgid(PL_gid);
2607 PL_gid = PerlProc_getgid();
2608 Perl_croak(aTHX_ "setrgid() not implemented");
2613 PL_gid = PerlProc_getgid();
2614 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2617 #ifdef HAS_SETGROUPS
2619 const char *p = SvPV_const(sv, len);
2620 Groups_t *gary = NULL;
2625 for (i = 0; i < NGROUPS; ++i) {
2626 while (*p && !isSPACE(*p))
2633 Newx(gary, i + 1, Groups_t);
2635 Renew(gary, i + 1, Groups_t);
2639 (void)setgroups(i, gary);
2642 #else /* HAS_SETGROUPS */
2644 #endif /* HAS_SETGROUPS */
2645 if (PL_delaymagic) {
2646 PL_delaymagic |= DM_EGID;
2647 break; /* don't do magic till later */
2650 (void)setegid((Gid_t)PL_egid);
2653 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2655 #ifdef HAS_SETRESGID
2656 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2658 if (PL_egid == PL_gid) /* special case $) = $( */
2659 (void)PerlProc_setgid(PL_egid);
2661 PL_egid = PerlProc_getegid();
2662 Perl_croak(aTHX_ "setegid() not implemented");
2667 PL_egid = PerlProc_getegid();
2668 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2671 PL_chopset = SvPV_force(sv,len);
2673 #ifndef MACOS_TRADITIONAL
2675 LOCK_DOLLARZERO_MUTEX;
2676 #ifdef HAS_SETPROCTITLE
2677 /* The BSDs don't show the argv[] in ps(1) output, they
2678 * show a string from the process struct and provide
2679 * the setproctitle() routine to manipulate that. */
2680 if (PL_origalen != 1) {
2681 s = SvPV_const(sv, len);
2682 # if __FreeBSD_version > 410001
2683 /* The leading "-" removes the "perl: " prefix,
2684 * but not the "(perl) suffix from the ps(1)
2685 * output, because that's what ps(1) shows if the
2686 * argv[] is modified. */
2687 setproctitle("-%s", s);
2688 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2689 /* This doesn't really work if you assume that
2690 * $0 = 'foobar'; will wipe out 'perl' from the $0
2691 * because in ps(1) output the result will be like
2692 * sprintf("perl: %s (perl)", s)
2693 * I guess this is a security feature:
2694 * one (a user process) cannot get rid of the original name.
2696 setproctitle("%s", s);
2699 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2700 if (PL_origalen != 1) {
2702 s = SvPV_const(sv, len);
2703 un.pst_command = (char *)s;
2704 pstat(PSTAT_SETCMD, un, len, 0, 0);
2707 if (PL_origalen > 1) {
2708 /* PL_origalen is set in perl_parse(). */
2709 s = SvPV_force(sv,len);
2710 if (len >= (STRLEN)PL_origalen-1) {
2711 /* Longer than original, will be truncated. We assume that
2712 * PL_origalen bytes are available. */
2713 Copy(s, PL_origargv[0], PL_origalen-1, char);
2716 /* Shorter than original, will be padded. */
2718 /* Special case for Mac OS X: see [perl #38868] */
2721 /* Is the space counterintuitive? Yes.
2722 * (You were expecting \0?)
2723 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2725 const int pad = ' ';
2727 Copy(s, PL_origargv[0], len, char);
2728 PL_origargv[0][len] = 0;
2729 memset(PL_origargv[0] + len + 1,
2730 pad, PL_origalen - len - 1);
2732 PL_origargv[0][PL_origalen-1] = 0;
2733 for (i = 1; i < PL_origargc; i++)
2737 UNLOCK_DOLLARZERO_MUTEX;
2745 Perl_whichsig(pTHX_ const char *sig)
2747 register char* const* sigv;
2748 PERL_UNUSED_CONTEXT;
2750 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2751 if (strEQ(sig,*sigv))
2752 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2754 if (strEQ(sig,"CHLD"))
2758 if (strEQ(sig,"CLD"))
2765 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2766 Perl_sighandler(int sig, ...)
2768 Perl_sighandler(int sig)
2771 #ifdef PERL_GET_SIG_CONTEXT
2772 dTHXa(PERL_GET_SIG_CONTEXT);
2779 SV * const tSv = PL_Sv;
2783 XPV * const tXpv = PL_Xpv;
2785 if (PL_savestack_ix + 15 <= PL_savestack_max)
2787 if (PL_markstack_ptr < PL_markstack_max - 2)
2789 if (PL_scopestack_ix < PL_scopestack_max - 3)
2792 if (!PL_psig_ptr[sig]) {
2793 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2798 /* Max number of items pushed there is 3*n or 4. We cannot fix
2799 infinity, so we fix 4 (in fact 5): */
2801 PL_savestack_ix += 5; /* Protect save in progress. */
2802 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
2805 PL_markstack_ptr++; /* Protect mark. */
2807 PL_scopestack_ix += 1;
2808 /* sv_2cv is too complicated, try a simpler variant first: */
2809 if (!SvROK(PL_psig_ptr[sig]) || !(cv = (CV*)SvRV(PL_psig_ptr[sig]))
2810 || SvTYPE(cv) != SVt_PVCV) {
2812 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
2815 if (!cv || !CvROOT(cv)) {
2816 if (ckWARN(WARN_SIGNAL))
2817 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2818 PL_sig_name[sig], (gv ? GvENAME(gv)
2825 if(PL_psig_name[sig]) {
2826 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
2828 #if !defined(PERL_IMPLICIT_CONTEXT)
2832 sv = sv_newmortal();
2833 sv_setpv(sv,PL_sig_name[sig]);
2836 PUSHSTACKi(PERLSI_SIGNAL);
2839 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2841 struct sigaction oact;
2843 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
2847 va_start(args, sig);
2848 sip = (siginfo_t*)va_arg(args, siginfo_t*);
2851 SV *rv = newRV_noinc((SV*)sih);
2852 /* The siginfo fields signo, code, errno, pid, uid,
2853 * addr, status, and band are defined by POSIX/SUSv3. */
2854 hv_store(sih, "signo", 5, newSViv(sip->si_signo), 0);
2855 hv_store(sih, "code", 4, newSViv(sip->si_code), 0);
2856 #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. */
2857 hv_store(sih, "errno", 5, newSViv(sip->si_errno), 0);
2858 hv_store(sih, "status", 6, newSViv(sip->si_status), 0);
2859 hv_store(sih, "uid", 3, newSViv(sip->si_uid), 0);
2860 hv_store(sih, "pid", 3, newSViv(sip->si_pid), 0);
2861 hv_store(sih, "addr", 4, newSVuv(PTR2UV(sip->si_addr)), 0);
2862 hv_store(sih, "band", 4, newSViv(sip->si_band), 0);
2866 PUSHs(newSVpv((char *)sip, sizeof(*sip)));
2875 call_sv((SV*)cv, G_DISCARD|G_EVAL);
2878 if (SvTRUE(ERRSV)) {
2880 #ifdef HAS_SIGPROCMASK
2881 /* Handler "died", for example to get out of a restart-able read().
2882 * Before we re-do that on its behalf re-enable the signal which was
2883 * blocked by the system when we entered.
2887 sigaddset(&set,sig);
2888 sigprocmask(SIG_UNBLOCK, &set, NULL);
2890 /* Not clear if this will work */
2891 (void)rsignal(sig, SIG_IGN);
2892 (void)rsignal(sig, PL_csighandlerp);
2894 #endif /* !PERL_MICRO */
2895 Perl_die(aTHX_ NULL);
2899 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2903 PL_scopestack_ix -= 1;
2906 PL_op = myop; /* Apparently not needed... */
2908 PL_Sv = tSv; /* Restore global temporaries. */
2915 S_restore_magic(pTHX_ const void *p)
2918 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2919 SV* const sv = mgs->mgs_sv;
2924 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2926 #ifdef PERL_OLD_COPY_ON_WRITE
2927 /* While magic was saved (and off) sv_setsv may well have seen
2928 this SV as a prime candidate for COW. */
2930 sv_force_normal_flags(sv, 0);
2934 SvFLAGS(sv) |= mgs->mgs_flags;
2937 if (SvGMAGICAL(sv)) {
2938 /* downgrade public flags to private,
2939 and discard any other private flags */
2941 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2943 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2944 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2949 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
2951 /* If we're still on top of the stack, pop us off. (That condition
2952 * will be satisfied if restore_magic was called explicitly, but *not*
2953 * if it's being called via leave_scope.)
2954 * The reason for doing this is that otherwise, things like sv_2cv()
2955 * may leave alloc gunk on the savestack, and some code
2956 * (e.g. sighandler) doesn't expect that...
2958 if (PL_savestack_ix == mgs->mgs_ss_ix)
2960 I32 popval = SSPOPINT;
2961 assert(popval == SAVEt_DESTRUCTOR_X);
2962 PL_savestack_ix -= 2;
2964 assert(popval == SAVEt_ALLOC);
2966 PL_savestack_ix -= popval;
2972 S_unwind_handler_stack(pTHX_ const void *p)
2975 const U32 flags = *(const U32*)p;
2978 PL_savestack_ix -= 5; /* Unprotect save in progress. */
2979 #if !defined(PERL_IMPLICIT_CONTEXT)
2981 SvREFCNT_dec(PL_sig_sv);
2986 =for apidoc magic_sethint
2988 Triggered by a store to %^H, records the key/value pair to
2989 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
2990 anything that would need a deep copy. Maybe we should warn if we find a
2996 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
2999 assert(mg->mg_len == HEf_SVKEY);
3001 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3002 an alternative leaf in there, with PL_compiling.cop_hints being used if
3003 it's NULL. If needed for threads, the alternative could lock a mutex,
3004 or take other more complex action. */
3006 /* Something changed in %^H, so it will need to be restored on scope exit.
3007 Doing this here saves a lot of doing it manually in perl code (and
3008 forgetting to do it, and consequent subtle errors. */
3009 PL_hints |= HINT_LOCALIZE_HH;
3010 PL_compiling.cop_hints_hash
3011 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3012 (SV *)mg->mg_ptr, sv);
3017 =for apidoc magic_sethint
3019 Triggered by a delete from %^H, records the key to
3020 C<PL_compiling.cop_hints_hash>.
3025 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3028 PERL_UNUSED_ARG(sv);
3030 assert(mg->mg_len == HEf_SVKEY);
3032 PERL_UNUSED_ARG(sv);
3034 PL_hints |= HINT_LOCALIZE_HH;
3035 PL_compiling.cop_hints_hash
3036 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
3037 (SV *)mg->mg_ptr, &PL_sv_placeholder);
3043 * c-indentation-style: bsd
3045 * indent-tabs-mode: t
3048 * ex: set ts=8 sts=4 sw=4 noet: