3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
19 =head1 Magical Functions
21 "Magic" is special data attached to SV structures in order to give them
22 "magical" properties. When any Perl code tries to read from, or assign to,
23 an SV marked as magical, it calls the 'get' or 'set' function associated
24 with that SV's magic. A get is called prior to reading an SV, in order to
25 give it a chance to update its internal value (get on $. writes the line
26 number of the last read filehandle into to the SV's IV slot), while
27 set is called after an SV has been written to, in order to allow it to make
28 use of its changed value (set on $/ copies the SV's new value to the
29 PL_rs global variable).
31 Magic is implemented as a linked list of MAGIC structures attached to the
32 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33 of functions that implement the get(), set(), length() etc functions,
34 plus space for some flags and pointers. For example, a tied variable has
35 a MAGIC structure that contains a pointer to the object associated with the
44 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
50 #if defined(HAS_SETGROUPS)
57 # include <sys/pstat.h>
60 #ifdef HAS_PRCTL_SET_NAME
61 # include <sys/prctl.h>
64 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
65 Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
67 Signal_t Perl_csighandler(int sig);
71 /* Missing protos on LynxOS */
72 void setruid(uid_t id);
73 void seteuid(uid_t id);
74 void setrgid(uid_t id);
75 void setegid(uid_t id);
79 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
88 /* MGS is typedef'ed to struct magic_state in perl.h */
91 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
96 PERL_ARGS_ASSERT_SAVE_MAGIC;
98 /* guard against sv having being freed midway by holding a private
100 SvREFCNT_inc_simple_void_NN(sv);
102 assert(SvMAGICAL(sv));
103 /* Turning READONLY off for a copy-on-write scalar (including shared
104 hash keys) is a bad idea. */
106 sv_force_normal_flags(sv, 0);
108 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
110 mgs = SSPTR(mgs_ix, MGS*);
112 mgs->mgs_magical = SvMAGICAL(sv);
113 mgs->mgs_readonly = SvREADONLY(sv) != 0;
114 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
118 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
119 /* No public flags are set, so promote any private flags to public. */
120 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
125 =for apidoc mg_magical
127 Turns on the magical status of an SV. See C<sv_magic>.
133 Perl_mg_magical(pTHX_ SV *sv)
136 PERL_ARGS_ASSERT_MG_MAGICAL;
140 if ((mg = SvMAGIC(sv))) {
142 const MGVTBL* const vtbl = mg->mg_virtual;
144 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
151 } while ((mg = mg->mg_moremagic));
152 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
158 /* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
161 S_is_container_magic(const MAGIC *mg)
164 switch (mg->mg_type) {
167 case PERL_MAGIC_regex_global:
168 case PERL_MAGIC_nkeys:
169 #ifdef USE_LOCALE_COLLATE
170 case PERL_MAGIC_collxfrm:
173 case PERL_MAGIC_taint:
175 case PERL_MAGIC_vstring:
176 case PERL_MAGIC_utf8:
177 case PERL_MAGIC_substr:
178 case PERL_MAGIC_defelem:
179 case PERL_MAGIC_arylen:
181 case PERL_MAGIC_backref:
182 case PERL_MAGIC_arylen_p:
183 case PERL_MAGIC_rhash:
184 case PERL_MAGIC_symtab:
185 case PERL_MAGIC_tied: /* treat as value, so 'local @tied' isn't tied */
186 case PERL_MAGIC_checkcall:
196 Do magic after a value is retrieved from the SV. See C<sv_magic>.
202 Perl_mg_get(pTHX_ SV *sv)
205 const I32 mgs_ix = SSNEW(sizeof(MGS));
207 MAGIC *newmg, *head, *cur, *mg;
209 PERL_ARGS_ASSERT_MG_GET;
211 save_magic(mgs_ix, sv);
213 /* We must call svt_get(sv, mg) for each valid entry in the linked
214 list of magic. svt_get() may delete the current entry, add new
215 magic to the head of the list, or upgrade the SV. AMS 20010810 */
217 newmg = cur = head = mg = SvMAGIC(sv);
219 const MGVTBL * const vtbl = mg->mg_virtual;
220 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
222 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
223 vtbl->svt_get(aTHX_ sv, mg);
225 /* guard against magic having been deleted - eg FETCH calling
228 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
232 /* recalculate flags if this entry was deleted. */
233 if (mg->mg_flags & MGf_GSKIP)
234 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
240 /* Have we finished with the new entries we saw? Start again
241 where we left off (unless there are more new entries). */
249 /* Were any new entries added? */
250 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
254 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
258 restore_magic(INT2PTR(void *, (IV)mgs_ix));
265 Do magic after a value is assigned to the SV. See C<sv_magic>.
271 Perl_mg_set(pTHX_ SV *sv)
274 const I32 mgs_ix = SSNEW(sizeof(MGS));
278 PERL_ARGS_ASSERT_MG_SET;
280 save_magic(mgs_ix, sv);
282 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
283 const MGVTBL* vtbl = mg->mg_virtual;
284 nextmg = mg->mg_moremagic; /* it may delete itself */
285 if (mg->mg_flags & MGf_GSKIP) {
286 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
287 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
289 if (PL_localizing == 2 && !S_is_container_magic(mg))
291 if (vtbl && vtbl->svt_set)
292 vtbl->svt_set(aTHX_ sv, mg);
295 restore_magic(INT2PTR(void*, (IV)mgs_ix));
300 =for apidoc mg_length
302 Report on the SV's length. See C<sv_magic>.
308 Perl_mg_length(pTHX_ SV *sv)
314 PERL_ARGS_ASSERT_MG_LENGTH;
316 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
317 const MGVTBL * const vtbl = mg->mg_virtual;
318 if (vtbl && vtbl->svt_len) {
319 const I32 mgs_ix = SSNEW(sizeof(MGS));
320 save_magic(mgs_ix, sv);
321 /* omit MGf_GSKIP -- not changed here */
322 len = vtbl->svt_len(aTHX_ sv, mg);
323 restore_magic(INT2PTR(void*, (IV)mgs_ix));
329 /* You can't know whether it's UTF-8 until you get the string again...
331 const U8 *s = (U8*)SvPV_const(sv, len);
334 len = utf8_length(s, s + len);
341 Perl_mg_size(pTHX_ SV *sv)
345 PERL_ARGS_ASSERT_MG_SIZE;
347 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
348 const MGVTBL* const vtbl = mg->mg_virtual;
349 if (vtbl && vtbl->svt_len) {
350 const I32 mgs_ix = SSNEW(sizeof(MGS));
352 save_magic(mgs_ix, sv);
353 /* omit MGf_GSKIP -- not changed here */
354 len = vtbl->svt_len(aTHX_ sv, mg);
355 restore_magic(INT2PTR(void*, (IV)mgs_ix));
362 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
366 Perl_croak(aTHX_ "Size magic not implemented");
375 Clear something magical that the SV represents. See C<sv_magic>.
381 Perl_mg_clear(pTHX_ SV *sv)
383 const I32 mgs_ix = SSNEW(sizeof(MGS));
387 PERL_ARGS_ASSERT_MG_CLEAR;
389 save_magic(mgs_ix, sv);
391 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
392 const MGVTBL* const vtbl = mg->mg_virtual;
393 /* omit GSKIP -- never set here */
395 nextmg = mg->mg_moremagic; /* it may delete itself */
397 if (vtbl && vtbl->svt_clear)
398 vtbl->svt_clear(aTHX_ sv, mg);
401 restore_magic(INT2PTR(void*, (IV)mgs_ix));
406 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
415 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
416 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
428 Finds the magic pointer for type matching the SV. See C<sv_magic>.
434 Perl_mg_find(pTHX_ const SV *sv, int type)
436 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
440 =for apidoc mg_findext
442 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
449 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
451 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
457 Copies the magic from one SV to another. See C<sv_magic>.
463 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
468 PERL_ARGS_ASSERT_MG_COPY;
470 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
471 const MGVTBL* const vtbl = mg->mg_virtual;
472 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
473 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
476 const char type = mg->mg_type;
477 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
479 (type == PERL_MAGIC_tied)
481 : (type == PERL_MAGIC_regdata && mg->mg_obj)
484 toLOWER(type), key, klen);
493 =for apidoc mg_localize
495 Copy some of the magic from an existing SV to new localized version of that
496 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
499 If setmagic is false then no set magic will be called on the new (empty) SV.
500 This typically means that assignment will soon follow (e.g. 'local $x = $y'),
501 and that will handle the magic.
507 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
512 PERL_ARGS_ASSERT_MG_LOCALIZE;
514 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
515 const MGVTBL* const vtbl = mg->mg_virtual;
516 if (!S_is_container_magic(mg))
519 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
520 (void)vtbl->svt_local(aTHX_ nsv, mg);
522 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
523 mg->mg_ptr, mg->mg_len);
525 /* container types should remain read-only across localization */
526 SvFLAGS(nsv) |= SvREADONLY(sv);
529 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
530 SvFLAGS(nsv) |= SvMAGICAL(sv);
539 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
541 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
543 const MGVTBL* const vtbl = mg->mg_virtual;
544 if (vtbl && vtbl->svt_free)
545 vtbl->svt_free(aTHX_ sv, mg);
546 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
547 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
548 Safefree(mg->mg_ptr);
549 else if (mg->mg_len == HEf_SVKEY)
550 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
552 if (mg->mg_flags & MGf_REFCOUNTED)
553 SvREFCNT_dec(mg->mg_obj);
560 Free any magic storage used by the SV. See C<sv_magic>.
566 Perl_mg_free(pTHX_ SV *sv)
571 PERL_ARGS_ASSERT_MG_FREE;
573 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
574 moremagic = mg->mg_moremagic;
575 mg_free_struct(sv, mg);
576 SvMAGIC_set(sv, moremagic);
578 SvMAGIC_set(sv, NULL);
584 =for apidoc Am|void|mg_free_type|SV *sv|int how
586 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
592 Perl_mg_free_type(pTHX_ SV *sv, int how)
594 MAGIC *mg, *prevmg, *moremg;
595 PERL_ARGS_ASSERT_MG_FREE_TYPE;
596 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
598 moremg = mg->mg_moremagic;
599 if (mg->mg_type == how) {
600 /* temporarily move to the head of the magic chain, in case
601 custom free code relies on this historical aspect of mg_free */
603 prevmg->mg_moremagic = moremg;
604 mg->mg_moremagic = SvMAGIC(sv);
607 newhead = mg->mg_moremagic;
608 mg_free_struct(sv, mg);
609 SvMAGIC_set(sv, newhead);
619 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
624 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
627 register const REGEXP * const rx = PM_GETRE(PL_curpm);
629 if (mg->mg_obj) { /* @+ */
630 /* return the number possible */
631 return RX_NPARENS(rx);
633 I32 paren = RX_LASTPAREN(rx);
635 /* return the last filled */
637 && (RX_OFFS(rx)[paren].start == -1
638 || RX_OFFS(rx)[paren].end == -1) )
649 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
653 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
656 register const REGEXP * const rx = PM_GETRE(PL_curpm);
658 register const I32 paren = mg->mg_len;
663 if (paren <= (I32)RX_NPARENS(rx) &&
664 (s = RX_OFFS(rx)[paren].start) != -1 &&
665 (t = RX_OFFS(rx)[paren].end) != -1)
668 if (mg->mg_obj) /* @+ */
673 if (i > 0 && RX_MATCH_UTF8(rx)) {
674 const char * const b = RX_SUBBEG(rx);
676 i = utf8_length((U8*)b, (U8*)(b+i));
687 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
689 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
692 Perl_croak_no_modify(aTHX);
693 NORETURN_FUNCTION_END;
697 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
702 register const REGEXP * rx;
703 const char * const remaining = mg->mg_ptr + 1;
705 PERL_ARGS_ASSERT_MAGIC_LEN;
707 switch (*mg->mg_ptr) {
709 if (*remaining == '\0') { /* ^P */
711 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
713 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
717 case '\015': /* $^MATCH */
718 if (strEQ(remaining, "ATCH")) {
725 paren = RX_BUFF_IDX_PREMATCH;
729 paren = RX_BUFF_IDX_POSTMATCH;
733 paren = RX_BUFF_IDX_FULLMATCH;
735 case '1': case '2': case '3': case '4':
736 case '5': case '6': case '7': case '8': case '9':
737 paren = atoi(mg->mg_ptr);
739 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
741 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
744 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
747 if (ckWARN(WARN_UNINITIALIZED))
752 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
753 paren = RX_LASTPAREN(rx);
758 case '\016': /* ^N */
759 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
760 paren = RX_LASTCLOSEPAREN(rx);
767 if (!SvPOK(sv) && SvNIOK(sv)) {
775 #define SvRTRIM(sv) STMT_START { \
777 STRLEN len = SvCUR(sv); \
778 char * const p = SvPVX(sv); \
779 while (len > 0 && isSPACE(p[len-1])) \
781 SvCUR_set(sv, len); \
787 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
789 PERL_ARGS_ASSERT_EMULATE_COP_IO;
791 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
792 sv_setsv(sv, &PL_sv_undef);
796 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
797 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
802 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
803 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
811 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
815 register const char *s = NULL;
817 const char * const remaining = mg->mg_ptr + 1;
818 const char nextchar = *remaining;
820 PERL_ARGS_ASSERT_MAGIC_GET;
822 switch (*mg->mg_ptr) {
823 case '\001': /* ^A */
824 sv_setsv(sv, PL_bodytarget);
825 if (SvTAINTED(PL_bodytarget))
828 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
829 if (nextchar == '\0') {
830 sv_setiv(sv, (IV)PL_minus_c);
832 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
833 sv_setiv(sv, (IV)STATUS_NATIVE);
837 case '\004': /* ^D */
838 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
840 case '\005': /* ^E */
841 if (nextchar == '\0') {
844 # include <descrip.h>
845 # include <starlet.h>
847 $DESCRIPTOR(msgdsc,msg);
848 sv_setnv(sv,(NV) vaxc$errno);
849 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
850 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
855 if (!(_emx_env & 0x200)) { /* Under DOS */
856 sv_setnv(sv, (NV)errno);
857 sv_setpv(sv, errno ? Strerror(errno) : "");
859 if (errno != errno_isOS2) {
860 const int tmp = _syserrno();
861 if (tmp) /* 2nd call to _syserrno() makes it 0 */
864 sv_setnv(sv, (NV)Perl_rc);
865 sv_setpv(sv, os2error(Perl_rc));
869 const DWORD dwErr = GetLastError();
870 sv_setnv(sv, (NV)dwErr);
872 PerlProc_GetOSError(sv, dwErr);
881 sv_setnv(sv, (NV)errno);
882 sv_setpv(sv, errno ? Strerror(errno) : "");
887 SvNOK_on(sv); /* what a wonderful hack! */
889 else if (strEQ(remaining, "NCODING"))
890 sv_setsv(sv, PL_encoding);
892 case '\006': /* ^F */
893 sv_setiv(sv, (IV)PL_maxsysfd);
895 case '\007': /* ^GLOBAL_PHASE */
896 if (strEQ(remaining, "LOBAL_PHASE")) {
897 sv_setpvn(sv, PL_phase_names[PL_phase],
898 strlen(PL_phase_names[PL_phase]));
901 case '\010': /* ^H */
902 sv_setiv(sv, (IV)PL_hints);
904 case '\011': /* ^I */ /* NOT \t in EBCDIC */
905 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
907 case '\017': /* ^O & ^OPEN */
908 if (nextchar == '\0') {
909 sv_setpv(sv, PL_osname);
912 else if (strEQ(remaining, "PEN")) {
913 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
917 if (nextchar == '\0') { /* ^P */
918 sv_setiv(sv, (IV)PL_perldb);
919 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
920 goto do_prematch_fetch;
921 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
922 goto do_postmatch_fetch;
925 case '\023': /* ^S */
926 if (nextchar == '\0') {
927 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
930 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
935 case '\024': /* ^T */
936 if (nextchar == '\0') {
938 sv_setnv(sv, PL_basetime);
940 sv_setiv(sv, (IV)PL_basetime);
943 else if (strEQ(remaining, "AINT"))
944 sv_setiv(sv, PL_tainting
945 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
948 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
949 if (strEQ(remaining, "NICODE"))
950 sv_setuv(sv, (UV) PL_unicode);
951 else if (strEQ(remaining, "TF8LOCALE"))
952 sv_setuv(sv, (UV) PL_utf8locale);
953 else if (strEQ(remaining, "TF8CACHE"))
954 sv_setiv(sv, (IV) PL_utf8cache);
956 case '\027': /* ^W & $^WARNING_BITS */
957 if (nextchar == '\0')
958 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
959 else if (strEQ(remaining, "ARNING_BITS")) {
960 if (PL_compiling.cop_warnings == pWARN_NONE) {
961 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
963 else if (PL_compiling.cop_warnings == pWARN_STD) {
966 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
970 else if (PL_compiling.cop_warnings == pWARN_ALL) {
971 /* Get the bit mask for $warnings::Bits{all}, because
972 * it could have been extended by warnings::register */
973 HV * const bits=get_hv("warnings::Bits", 0);
975 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
977 sv_setsv(sv, *bits_all);
980 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
984 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
985 *PL_compiling.cop_warnings);
990 case '\015': /* $^MATCH */
991 if (strEQ(remaining, "ATCH")) {
992 case '1': case '2': case '3': case '4':
993 case '5': case '6': case '7': case '8': case '9': case '&':
994 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
996 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
997 * XXX Does the new way break anything?
999 paren = atoi(mg->mg_ptr); /* $& is in [0] */
1000 CALLREG_NUMBUF_FETCH(rx,paren,sv);
1003 sv_setsv(sv,&PL_sv_undef);
1007 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1008 if (RX_LASTPAREN(rx)) {
1009 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
1013 sv_setsv(sv,&PL_sv_undef);
1015 case '\016': /* ^N */
1016 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1017 if (RX_LASTCLOSEPAREN(rx)) {
1018 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
1023 sv_setsv(sv,&PL_sv_undef);
1027 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1028 CALLREG_NUMBUF_FETCH(rx,-2,sv);
1031 sv_setsv(sv,&PL_sv_undef);
1035 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1036 CALLREG_NUMBUF_FETCH(rx,-1,sv);
1039 sv_setsv(sv,&PL_sv_undef);
1042 if (GvIO(PL_last_in_gv)) {
1043 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1048 sv_setiv(sv, (IV)STATUS_CURRENT);
1049 #ifdef COMPLEX_STATUS
1050 SvUPGRADE(sv, SVt_PVLV);
1051 LvTARGOFF(sv) = PL_statusvalue;
1052 LvTARGLEN(sv) = PL_statusvalue_vms;
1057 if (!isGV_with_GP(PL_defoutgv))
1059 else if (GvIOp(PL_defoutgv))
1060 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1064 sv_setpv(sv,GvENAME(PL_defoutgv));
1065 sv_catpvs(sv,"_TOP");
1069 if (!isGV_with_GP(PL_defoutgv))
1071 else if (GvIOp(PL_defoutgv))
1072 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1074 s = GvENAME(PL_defoutgv);
1078 if (GvIO(PL_defoutgv))
1079 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1082 if (GvIO(PL_defoutgv))
1083 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1086 if (GvIO(PL_defoutgv))
1087 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1094 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
1097 if (GvIO(PL_defoutgv))
1098 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1102 sv_copypv(sv, PL_ors_sv);
1108 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1110 sv_setnv(sv, (NV)errno);
1113 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1114 sv_setpv(sv, os2error(Perl_rc));
1117 sv_setpv(sv, errno ? Strerror(errno) : "");
1119 SvPOK_on(sv); /* may have got removed during taint processing */
1124 SvNOK_on(sv); /* what a wonderful hack! */
1127 sv_setiv(sv, (IV)PL_uid);
1130 sv_setiv(sv, (IV)PL_euid);
1133 sv_setiv(sv, (IV)PL_gid);
1136 sv_setiv(sv, (IV)PL_egid);
1138 #ifdef HAS_GETGROUPS
1140 Groups_t *gary = NULL;
1141 I32 i, num_groups = getgroups(0, gary);
1142 Newx(gary, num_groups, Groups_t);
1143 num_groups = getgroups(num_groups, gary);
1144 for (i = 0; i < num_groups; i++)
1145 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1148 (void)SvIOK_on(sv); /* what a wonderful hack! */
1158 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1160 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1162 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1164 if (uf && uf->uf_val)
1165 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1170 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1173 STRLEN len = 0, klen;
1174 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
1175 const char * const ptr = MgPV_const(mg,klen);
1178 PERL_ARGS_ASSERT_MAGIC_SETENV;
1180 #ifdef DYNAMIC_ENV_FETCH
1181 /* We just undefd an environment var. Is a replacement */
1182 /* waiting in the wings? */
1184 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1186 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1190 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
1191 /* And you'll never guess what the dog had */
1192 /* in its mouth... */
1194 MgTAINTEDDIR_off(mg);
1196 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
1197 char pathbuf[256], eltbuf[256], *cp, *elt;
1200 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1202 do { /* DCL$PATH may be a search list */
1203 while (1) { /* as may dev portion of any element */
1204 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1205 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1206 cando_by_name(S_IWUSR,0,elt) ) {
1207 MgTAINTEDDIR_on(mg);
1211 if ((cp = strchr(elt, ':')) != NULL)
1213 if (my_trnlnm(elt, eltbuf, j++))
1219 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1222 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1223 const char * const strend = s + len;
1225 while (s < strend) {
1229 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1230 const char path_sep = '|';
1232 const char path_sep = ':';
1234 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1235 s, strend, path_sep, &i);
1237 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1239 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1241 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1243 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1244 MgTAINTEDDIR_on(mg);
1250 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1256 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1258 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1259 PERL_UNUSED_ARG(sv);
1260 my_setenv(MgPV_nolen_const(mg),NULL);
1265 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1268 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1269 PERL_UNUSED_ARG(mg);
1271 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1273 if (PL_localizing) {
1276 hv_iterinit(MUTABLE_HV(sv));
1277 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1279 my_setenv(hv_iterkey(entry, &keylen),
1280 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1288 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1291 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1292 PERL_UNUSED_ARG(sv);
1293 PERL_UNUSED_ARG(mg);
1295 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1303 #ifdef HAS_SIGPROCMASK
1305 restore_sigmask(pTHX_ SV *save_sv)
1307 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1308 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1312 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1315 /* Are we fetching a signal entry? */
1316 int i = (I16)mg->mg_private;
1318 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1321 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1326 sv_setsv(sv,PL_psig_ptr[i]);
1328 Sighandler_t sigstate = rsignal_state(i);
1329 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1330 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1333 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1334 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1337 /* cache state so we don't fetch it again */
1338 if(sigstate == (Sighandler_t) SIG_IGN)
1339 sv_setpvs(sv,"IGNORE");
1341 sv_setsv(sv,&PL_sv_undef);
1342 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1349 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1351 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1352 PERL_UNUSED_ARG(sv);
1354 magic_setsig(NULL, mg);
1355 return sv_unmagic(sv, mg->mg_type);
1359 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1360 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1362 Perl_csighandler(int sig)
1365 #ifdef PERL_GET_SIG_CONTEXT
1366 dTHXa(PERL_GET_SIG_CONTEXT);
1370 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1371 (void) rsignal(sig, PL_csighandlerp);
1372 if (PL_sig_ignoring[sig]) return;
1374 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1375 if (PL_sig_defaulting[sig])
1376 #ifdef KILL_BY_SIGPRC
1377 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1392 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1393 /* Call the perl level handler now--
1394 * with risk we may be in malloc() or being destructed etc. */
1395 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1396 (*PL_sighandlerp)(sig, NULL, NULL);
1398 (*PL_sighandlerp)(sig);
1401 if (!PL_psig_pend) return;
1402 /* Set a flag to say this signal is pending, that is awaiting delivery after
1403 * the current Perl opcode completes */
1404 PL_psig_pend[sig]++;
1406 #ifndef SIG_PENDING_DIE_COUNT
1407 # define SIG_PENDING_DIE_COUNT 120
1409 /* Add one to say _a_ signal is pending */
1410 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1411 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1412 (unsigned long)SIG_PENDING_DIE_COUNT);
1416 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1418 Perl_csighandler_init(void)
1421 if (PL_sig_handlers_initted) return;
1423 for (sig = 1; sig < SIG_SIZE; sig++) {
1424 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1426 PL_sig_defaulting[sig] = 1;
1427 (void) rsignal(sig, PL_csighandlerp);
1429 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1430 PL_sig_ignoring[sig] = 0;
1433 PL_sig_handlers_initted = 1;
1438 Perl_despatch_signals(pTHX)
1443 for (sig = 1; sig < SIG_SIZE; sig++) {
1444 if (PL_psig_pend[sig]) {
1446 PERL_BLOCKSIG_ADD(set, sig);
1447 PL_psig_pend[sig] = 0;
1448 PERL_BLOCKSIG_BLOCK(set);
1449 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
1450 (*PL_sighandlerp)(sig, NULL, NULL);
1452 (*PL_sighandlerp)(sig);
1454 PERL_BLOCKSIG_UNBLOCK(set);
1460 /* sv of NULL signifies that we're acting as magic_clearsig. */
1462 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1467 /* Need to be careful with SvREFCNT_dec(), because that can have side
1468 * effects (due to closures). We must make sure that the new disposition
1469 * is in place before it is called.
1473 #ifdef HAS_SIGPROCMASK
1477 register const char *s = MgPV_const(mg,len);
1479 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1482 if (strEQ(s,"__DIE__"))
1484 else if (strEQ(s,"__WARN__")
1485 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1486 /* Merge the existing behaviours, which are as follows:
1487 magic_setsig, we always set svp to &PL_warnhook
1488 (hence we always change the warnings handler)
1489 For magic_clearsig, we don't change the warnings handler if it's
1490 set to the &PL_warnhook. */
1493 Perl_croak(aTHX_ "No such hook: %s", s);
1496 if (*svp != PERL_WARNHOOK_FATAL)
1502 i = (I16)mg->mg_private;
1504 i = whichsig(s); /* ...no, a brick */
1505 mg->mg_private = (U16)i;
1509 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1512 #ifdef HAS_SIGPROCMASK
1513 /* Avoid having the signal arrive at a bad time, if possible. */
1516 sigprocmask(SIG_BLOCK, &set, &save);
1518 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1519 SAVEFREESV(save_sv);
1520 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1523 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1524 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1526 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1527 PL_sig_ignoring[i] = 0;
1529 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1530 PL_sig_defaulting[i] = 0;
1532 to_dec = PL_psig_ptr[i];
1534 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1535 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1537 /* Signals don't change name during the program's execution, so once
1538 they're cached in the appropriate slot of PL_psig_name, they can
1541 Ideally we'd find some way of making SVs at (C) compile time, or
1542 at least, doing most of the work. */
1543 if (!PL_psig_name[i]) {
1544 PL_psig_name[i] = newSVpvn(s, len);
1545 SvREADONLY_on(PL_psig_name[i]);
1548 SvREFCNT_dec(PL_psig_name[i]);
1549 PL_psig_name[i] = NULL;
1550 PL_psig_ptr[i] = NULL;
1553 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1555 (void)rsignal(i, PL_csighandlerp);
1558 *svp = SvREFCNT_inc_simple_NN(sv);
1560 if (sv && SvOK(sv)) {
1561 s = SvPV_force(sv, len);
1565 if (sv && strEQ(s,"IGNORE")) {
1567 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1568 PL_sig_ignoring[i] = 1;
1569 (void)rsignal(i, PL_csighandlerp);
1571 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1575 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1577 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1578 PL_sig_defaulting[i] = 1;
1579 (void)rsignal(i, PL_csighandlerp);
1581 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1587 * We should warn if HINT_STRICT_REFS, but without
1588 * access to a known hint bit in a known OP, we can't
1589 * tell whether HINT_STRICT_REFS is in force or not.
1591 if (!strchr(s,':') && !strchr(s,'\''))
1592 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1595 (void)rsignal(i, PL_csighandlerp);
1597 *svp = SvREFCNT_inc_simple_NN(sv);
1601 #ifdef HAS_SIGPROCMASK
1605 SvREFCNT_dec(to_dec);
1608 #endif /* !PERL_MICRO */
1611 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1614 PERL_ARGS_ASSERT_MAGIC_SETISA;
1615 PERL_UNUSED_ARG(sv);
1617 /* Skip _isaelem because _isa will handle it shortly */
1618 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1621 return magic_clearisa(NULL, mg);
1624 /* sv of NULL signifies that we're acting as magic_setisa. */
1626 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1631 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1633 /* Bail out if destruction is going on */
1634 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1637 av_clear(MUTABLE_AV(sv));
1639 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1640 /* This occurs with setisa_elem magic, which calls this
1642 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1644 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1645 SV **svp = AvARRAY((AV *)mg->mg_obj);
1646 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1648 stash = GvSTASH((GV *)*svp++);
1649 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1656 (const GV *)mg->mg_obj
1659 /* The stash may have been detached from the symbol table, so check its
1660 name before doing anything. */
1661 if (stash && HvENAME_get(stash))
1662 mro_isa_changed_in(stash);
1668 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1671 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
1672 PERL_UNUSED_ARG(sv);
1673 PERL_UNUSED_ARG(mg);
1674 PL_amagic_generation++;
1680 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1682 HV * const hv = MUTABLE_HV(LvTARG(sv));
1685 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1686 PERL_UNUSED_ARG(mg);
1689 (void) hv_iterinit(hv);
1690 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1693 while (hv_iternext(hv))
1698 sv_setiv(sv, (IV)i);
1703 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1705 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1706 PERL_UNUSED_ARG(mg);
1708 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1714 =for apidoc magic_methcall
1716 Invoke a magic method (like FETCH).
1718 * sv and mg are the tied thinggy and the tie magic;
1719 * meth is the name of the method to call;
1720 * argc is the number of args (in addition to $self) to pass to the method;
1721 the args themselves are any values following the argc argument.
1723 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1724 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
1726 Returns the SV (if any) returned by the method, or NULL on failure.
1733 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1740 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1744 if (flags & G_WRITING_TO_STDERR) {
1748 SAVESPTR(PL_stderrgv);
1752 PUSHSTACKi(PERLSI_MAGIC);
1756 PUSHs(SvTIED_obj(sv, mg));
1757 if (flags & G_UNDEF_FILL) {
1759 PUSHs(&PL_sv_undef);
1761 } else if (argc > 0) {
1763 va_start(args, argc);
1766 SV *const sv = va_arg(args, SV *);
1773 if (flags & G_DISCARD) {
1774 call_method(meth, G_SCALAR|G_DISCARD);
1777 if (call_method(meth, G_SCALAR))
1778 ret = *PL_stack_sp--;
1781 if (flags & G_WRITING_TO_STDERR)
1788 /* wrapper for magic_methcall that creates the first arg */
1791 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
1797 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1800 if (mg->mg_len >= 0) {
1801 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
1803 else if (mg->mg_len == HEf_SVKEY)
1804 arg1 = MUTABLE_SV(mg->mg_ptr);
1806 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1807 arg1 = newSViv((IV)(mg->mg_len));
1811 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
1813 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
1817 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1822 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1824 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1831 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1833 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1835 if (mg->mg_type == PERL_MAGIC_tiedelem)
1836 mg->mg_flags |= MGf_GSKIP;
1837 magic_methpack(sv,mg,"FETCH");
1842 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1848 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1850 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1851 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1852 * public flags indicate its value based on copying from $val. Doing
1853 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1854 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1855 * wrong if $val happened to be tainted, as sv hasn't got magic
1856 * enabled, even though taint magic is in the chain. In which case,
1857 * fake up a temporary tainted value (this is easier than temporarily
1858 * re-enabling magic on sv). */
1860 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1861 && (tmg->mg_len & 1))
1863 val = sv_mortalcopy(sv);
1869 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
1874 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1876 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1878 return magic_methpack(sv,mg,"DELETE");
1883 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1889 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1891 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1893 retval = SvIV(retsv)-1;
1895 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
1897 return (U32) retval;
1901 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1905 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1907 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
1912 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1917 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1919 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1920 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
1927 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
1929 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1931 return magic_methpack(sv,mg,"EXISTS");
1935 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1939 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1940 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
1942 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1944 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1946 if (HvEITER_get(hv))
1947 /* we are in an iteration so the hash cannot be empty */
1949 /* no xhv_eiter so now use FIRSTKEY */
1950 key = sv_newmortal();
1951 magic_nextpack(MUTABLE_SV(hv), mg, key);
1952 HvEITER_set(hv, NULL); /* need to reset iterator */
1953 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1956 /* there is a SCALAR method that we can call */
1957 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
1959 retval = &PL_sv_undef;
1964 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1967 GV * const gv = PL_DBline;
1968 const I32 i = SvTRUE(sv);
1969 SV ** const svp = av_fetch(GvAV(gv),
1970 atoi(MgPV_nolen_const(mg)), FALSE);
1972 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1974 if (svp && SvIOKp(*svp)) {
1975 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1977 /* set or clear breakpoint in the relevant control op */
1979 o->op_flags |= OPf_SPECIAL;
1981 o->op_flags &= ~OPf_SPECIAL;
1988 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
1991 AV * const obj = MUTABLE_AV(mg->mg_obj);
1993 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1996 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
2004 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2007 AV * const obj = MUTABLE_AV(mg->mg_obj);
2009 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2012 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
2014 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2015 "Attempt to set length of freed array");
2021 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2025 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2026 PERL_UNUSED_ARG(sv);
2028 /* during global destruction, mg_obj may already have been freed */
2029 if (PL_in_clean_all)
2032 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2035 /* arylen scalar holds a pointer back to the array, but doesn't own a
2036 reference. Hence the we (the array) are about to go away with it
2037 still pointing at us. Clear its pointer, else it would be pointing
2038 at free memory. See the comment in sv_magic about reference loops,
2039 and why it can't own a reference to us. */
2046 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2049 SV* const lsv = LvTARG(sv);
2051 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2052 PERL_UNUSED_ARG(mg);
2054 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
2055 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2056 if (found && found->mg_len >= 0) {
2057 I32 i = found->mg_len;
2059 sv_pos_b2u(lsv, &i);
2060 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
2069 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2072 SV* const lsv = LvTARG(sv);
2078 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2079 PERL_UNUSED_ARG(mg);
2081 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
2082 found = mg_find(lsv, PERL_MAGIC_regex_global);
2088 #ifdef PERL_OLD_COPY_ON_WRITE
2090 sv_force_normal_flags(lsv, 0);
2092 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
2095 else if (!SvOK(sv)) {
2099 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2101 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
2104 ulen = sv_len_utf8(lsv);
2114 else if (pos > (SSize_t)len)
2119 sv_pos_u2b(lsv, &p, 0);
2123 found->mg_len = pos;
2124 found->mg_flags &= ~MGf_MINMATCH;
2130 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2133 SV * const lsv = LvTARG(sv);
2134 const char * const tmps = SvPV_const(lsv,len);
2135 STRLEN offs = LvTARGOFF(sv);
2136 STRLEN rem = LvTARGLEN(sv);
2138 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2139 PERL_UNUSED_ARG(mg);
2142 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
2145 if (rem > len - offs)
2147 sv_setpvn(sv, tmps + offs, rem);
2154 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2158 const char * const tmps = SvPV_const(sv, len);
2159 SV * const lsv = LvTARG(sv);
2160 STRLEN lvoff = LvTARGOFF(sv);
2161 STRLEN lvlen = LvTARGLEN(sv);
2163 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2164 PERL_UNUSED_ARG(mg);
2167 sv_utf8_upgrade(lsv);
2168 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2169 sv_insert(lsv, lvoff, lvlen, tmps, len);
2170 LvTARGLEN(sv) = sv_len_utf8(sv);
2173 else if (lsv && SvUTF8(lsv)) {
2175 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2176 LvTARGLEN(sv) = len;
2177 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2178 sv_insert(lsv, lvoff, lvlen, utf8, len);
2182 sv_insert(lsv, lvoff, lvlen, tmps, len);
2183 LvTARGLEN(sv) = len;
2190 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2194 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2195 PERL_UNUSED_ARG(sv);
2197 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
2202 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2206 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2207 PERL_UNUSED_ARG(sv);
2209 /* update taint status */
2218 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2220 SV * const lsv = LvTARG(sv);
2222 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2223 PERL_UNUSED_ARG(mg);
2226 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2234 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2236 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2237 PERL_UNUSED_ARG(mg);
2238 do_vecset(sv); /* XXX slurp this routine */
2243 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2248 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2250 if (LvTARGLEN(sv)) {
2252 SV * const ahv = LvTARG(sv);
2253 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2258 AV *const av = MUTABLE_AV(LvTARG(sv));
2259 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2260 targ = AvARRAY(av)[LvTARGOFF(sv)];
2262 if (targ && (targ != &PL_sv_undef)) {
2263 /* somebody else defined it for us */
2264 SvREFCNT_dec(LvTARG(sv));
2265 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2267 SvREFCNT_dec(mg->mg_obj);
2269 mg->mg_flags &= ~MGf_REFCOUNTED;
2274 sv_setsv(sv, targ ? targ : &PL_sv_undef);
2279 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2281 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2282 PERL_UNUSED_ARG(mg);
2286 sv_setsv(LvTARG(sv), sv);
2287 SvSETMAGIC(LvTARG(sv));
2293 Perl_vivify_defelem(pTHX_ SV *sv)
2299 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2301 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2304 SV * const ahv = LvTARG(sv);
2305 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2308 if (!value || value == &PL_sv_undef)
2309 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2312 AV *const av = MUTABLE_AV(LvTARG(sv));
2313 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
2314 LvTARG(sv) = NULL; /* array can't be extended */
2316 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
2317 if (!svp || (value = *svp) == &PL_sv_undef)
2318 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
2321 SvREFCNT_inc_simple_void(value);
2322 SvREFCNT_dec(LvTARG(sv));
2325 SvREFCNT_dec(mg->mg_obj);
2327 mg->mg_flags &= ~MGf_REFCOUNTED;
2331 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2333 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2334 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2339 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2341 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2342 PERL_UNUSED_CONTEXT;
2344 if (!isGV_with_GP(sv))
2350 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2352 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2354 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2356 if (uf && uf->uf_set)
2357 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2362 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2364 const char type = mg->mg_type;
2366 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2368 if (type == PERL_MAGIC_qr) {
2369 } else if (type == PERL_MAGIC_bm) {
2373 assert(type == PERL_MAGIC_fm);
2376 return sv_unmagic(sv, type);
2379 #ifdef USE_LOCALE_COLLATE
2381 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2383 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2386 * RenE<eacute> Descartes said "I think not."
2387 * and vanished with a faint plop.
2389 PERL_UNUSED_CONTEXT;
2390 PERL_UNUSED_ARG(sv);
2392 Safefree(mg->mg_ptr);
2398 #endif /* USE_LOCALE_COLLATE */
2400 /* Just clear the UTF-8 cache data. */
2402 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2404 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2405 PERL_UNUSED_CONTEXT;
2406 PERL_UNUSED_ARG(sv);
2407 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2409 mg->mg_len = -1; /* The mg_len holds the len cache. */
2414 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2417 register const char *s;
2419 register const REGEXP * rx;
2420 const char * const remaining = mg->mg_ptr + 1;
2425 PERL_ARGS_ASSERT_MAGIC_SET;
2427 switch (*mg->mg_ptr) {
2428 case '\015': /* $^MATCH */
2429 if (strEQ(remaining, "ATCH"))
2431 case '`': /* ${^PREMATCH} caught below */
2433 paren = RX_BUFF_IDX_PREMATCH;
2435 case '\'': /* ${^POSTMATCH} caught below */
2437 paren = RX_BUFF_IDX_POSTMATCH;
2441 paren = RX_BUFF_IDX_FULLMATCH;
2443 case '1': case '2': case '3': case '4':
2444 case '5': case '6': case '7': case '8': case '9':
2445 paren = atoi(mg->mg_ptr);
2447 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2448 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2450 /* Croak with a READONLY error when a numbered match var is
2451 * set without a previous pattern match. Unless it's C<local $1>
2453 if (!PL_localizing) {
2454 Perl_croak_no_modify(aTHX);
2458 case '\001': /* ^A */
2459 sv_setsv(PL_bodytarget, sv);
2460 /* mg_set() has temporarily made sv non-magical */
2462 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2463 SvTAINTED_on(PL_bodytarget);
2465 SvTAINTED_off(PL_bodytarget);
2468 case '\003': /* ^C */
2469 PL_minus_c = cBOOL(SvIV(sv));
2472 case '\004': /* ^D */
2474 s = SvPV_nolen_const(sv);
2475 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2476 if (DEBUG_x_TEST || DEBUG_B_TEST)
2477 dump_all_perl(!DEBUG_B_TEST);
2479 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2482 case '\005': /* ^E */
2483 if (*(mg->mg_ptr+1) == '\0') {
2485 set_vaxc_errno(SvIV(sv));
2488 SetLastError( SvIV(sv) );
2491 os2_setsyserrno(SvIV(sv));
2493 /* will anyone ever use this? */
2494 SETERRNO(SvIV(sv), 4);
2499 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2500 SvREFCNT_dec(PL_encoding);
2501 if (SvOK(sv) || SvGMAGICAL(sv)) {
2502 PL_encoding = newSVsv(sv);
2509 case '\006': /* ^F */
2510 PL_maxsysfd = SvIV(sv);
2512 case '\010': /* ^H */
2513 PL_hints = SvIV(sv);
2515 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2516 Safefree(PL_inplace);
2517 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2519 case '\017': /* ^O */
2520 if (*(mg->mg_ptr+1) == '\0') {
2521 Safefree(PL_osname);
2524 TAINT_PROPER("assigning to $^O");
2525 PL_osname = savesvpv(sv);
2528 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2530 const char *const start = SvPV(sv, len);
2531 const char *out = (const char*)memchr(start, '\0', len);
2535 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2536 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2538 /* Opening for input is more common than opening for output, so
2539 ensure that hints for input are sooner on linked list. */
2540 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2542 : newSVpvs_flags("", SvUTF8(sv));
2543 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2546 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2548 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2552 case '\020': /* ^P */
2553 if (*remaining == '\0') { /* ^P */
2554 PL_perldb = SvIV(sv);
2555 if (PL_perldb && !PL_DBsingle)
2558 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2560 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2564 case '\024': /* ^T */
2566 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2568 PL_basetime = (Time_t)SvIV(sv);
2571 case '\025': /* ^UTF8CACHE */
2572 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2573 PL_utf8cache = (signed char) sv_2iv(sv);
2576 case '\027': /* ^W & $^WARNING_BITS */
2577 if (*(mg->mg_ptr+1) == '\0') {
2578 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2580 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2581 | (i ? G_WARN_ON : G_WARN_OFF) ;
2584 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2585 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2586 if (!SvPOK(sv) && PL_localizing) {
2587 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2588 PL_compiling.cop_warnings = pWARN_NONE;
2593 int accumulate = 0 ;
2594 int any_fatals = 0 ;
2595 const char * const ptr = SvPV_const(sv, len) ;
2596 for (i = 0 ; i < len ; ++i) {
2597 accumulate |= ptr[i] ;
2598 any_fatals |= (ptr[i] & 0xAA) ;
2601 if (!specialWARN(PL_compiling.cop_warnings))
2602 PerlMemShared_free(PL_compiling.cop_warnings);
2603 PL_compiling.cop_warnings = pWARN_NONE;
2605 /* Yuck. I can't see how to abstract this: */
2606 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2607 WARN_ALL) && !any_fatals) {
2608 if (!specialWARN(PL_compiling.cop_warnings))
2609 PerlMemShared_free(PL_compiling.cop_warnings);
2610 PL_compiling.cop_warnings = pWARN_ALL;
2611 PL_dowarn |= G_WARN_ONCE ;
2615 const char *const p = SvPV_const(sv, len);
2617 PL_compiling.cop_warnings
2618 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2621 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2622 PL_dowarn |= G_WARN_ONCE ;
2630 if (PL_localizing) {
2631 if (PL_localizing == 1)
2632 SAVESPTR(PL_last_in_gv);
2634 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2635 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2638 if (isGV_with_GP(PL_defoutgv)) {
2639 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2640 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2641 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2645 if (isGV_with_GP(PL_defoutgv)) {
2646 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2647 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2648 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2652 if (isGV_with_GP(PL_defoutgv))
2653 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
2656 if (isGV_with_GP(PL_defoutgv)) {
2657 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2658 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2659 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2663 if (isGV_with_GP(PL_defoutgv))
2664 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
2668 IO * const io = GvIO(PL_defoutgv);
2671 if ((SvIV(sv)) == 0)
2672 IoFLAGS(io) &= ~IOf_FLUSH;
2674 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2675 PerlIO *ofp = IoOFP(io);
2677 (void)PerlIO_flush(ofp);
2678 IoFLAGS(io) |= IOf_FLUSH;
2684 SvREFCNT_dec(PL_rs);
2685 PL_rs = newSVsv(sv);
2688 SvREFCNT_dec(PL_ors_sv);
2689 if (SvOK(sv) || SvGMAGICAL(sv)) {
2690 PL_ors_sv = newSVsv(sv);
2697 CopARYBASE_set(&PL_compiling, SvIV(sv));
2700 #ifdef COMPLEX_STATUS
2701 if (PL_localizing == 2) {
2702 SvUPGRADE(sv, SVt_PVLV);
2703 PL_statusvalue = LvTARGOFF(sv);
2704 PL_statusvalue_vms = LvTARGLEN(sv);
2708 #ifdef VMSISH_STATUS
2710 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
2713 STATUS_UNIX_EXIT_SET(SvIV(sv));
2718 # define PERL_VMS_BANG vaxc$errno
2720 # define PERL_VMS_BANG 0
2722 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2723 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2728 if (PL_delaymagic) {
2729 PL_delaymagic |= DM_RUID;
2730 break; /* don't do magic till later */
2733 (void)setruid((Uid_t)PL_uid);
2736 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2738 #ifdef HAS_SETRESUID
2739 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2741 if (PL_uid == PL_euid) { /* special case $< = $> */
2743 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2744 if (PL_uid != 0 && PerlProc_getuid() == 0)
2745 (void)PerlProc_setuid(0);
2747 (void)PerlProc_setuid(PL_uid);
2749 PL_uid = PerlProc_getuid();
2750 Perl_croak(aTHX_ "setruid() not implemented");
2755 PL_uid = PerlProc_getuid();
2759 if (PL_delaymagic) {
2760 PL_delaymagic |= DM_EUID;
2761 break; /* don't do magic till later */
2764 (void)seteuid((Uid_t)PL_euid);
2767 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2769 #ifdef HAS_SETRESUID
2770 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2772 if (PL_euid == PL_uid) /* special case $> = $< */
2773 PerlProc_setuid(PL_euid);
2775 PL_euid = PerlProc_geteuid();
2776 Perl_croak(aTHX_ "seteuid() not implemented");
2781 PL_euid = PerlProc_geteuid();
2785 if (PL_delaymagic) {
2786 PL_delaymagic |= DM_RGID;
2787 break; /* don't do magic till later */
2790 (void)setrgid((Gid_t)PL_gid);
2793 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2795 #ifdef HAS_SETRESGID
2796 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2798 if (PL_gid == PL_egid) /* special case $( = $) */
2799 (void)PerlProc_setgid(PL_gid);
2801 PL_gid = PerlProc_getgid();
2802 Perl_croak(aTHX_ "setrgid() not implemented");
2807 PL_gid = PerlProc_getgid();
2810 #ifdef HAS_SETGROUPS
2812 const char *p = SvPV_const(sv, len);
2813 Groups_t *gary = NULL;
2814 #ifdef _SC_NGROUPS_MAX
2815 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2820 int maxgrp = NGROUPS;
2826 for (i = 0; i < maxgrp; ++i) {
2827 while (*p && !isSPACE(*p))
2834 Newx(gary, i + 1, Groups_t);
2836 Renew(gary, i + 1, Groups_t);
2840 (void)setgroups(i, gary);
2843 #else /* HAS_SETGROUPS */
2845 #endif /* HAS_SETGROUPS */
2846 if (PL_delaymagic) {
2847 PL_delaymagic |= DM_EGID;
2848 break; /* don't do magic till later */
2851 (void)setegid((Gid_t)PL_egid);
2854 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2856 #ifdef HAS_SETRESGID
2857 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2859 if (PL_egid == PL_gid) /* special case $) = $( */
2860 (void)PerlProc_setgid(PL_egid);
2862 PL_egid = PerlProc_getegid();
2863 Perl_croak(aTHX_ "setegid() not implemented");
2868 PL_egid = PerlProc_getegid();
2871 PL_chopset = SvPV_force(sv,len);
2874 LOCK_DOLLARZERO_MUTEX;
2875 #ifdef HAS_SETPROCTITLE
2876 /* The BSDs don't show the argv[] in ps(1) output, they
2877 * show a string from the process struct and provide
2878 * the setproctitle() routine to manipulate that. */
2879 if (PL_origalen != 1) {
2880 s = SvPV_const(sv, len);
2881 # if __FreeBSD_version > 410001
2882 /* The leading "-" removes the "perl: " prefix,
2883 * but not the "(perl) suffix from the ps(1)
2884 * output, because that's what ps(1) shows if the
2885 * argv[] is modified. */
2886 setproctitle("-%s", s);
2887 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2888 /* This doesn't really work if you assume that
2889 * $0 = 'foobar'; will wipe out 'perl' from the $0
2890 * because in ps(1) output the result will be like
2891 * sprintf("perl: %s (perl)", s)
2892 * I guess this is a security feature:
2893 * one (a user process) cannot get rid of the original name.
2895 setproctitle("%s", s);
2898 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2899 if (PL_origalen != 1) {
2901 s = SvPV_const(sv, len);
2902 un.pst_command = (char *)s;
2903 pstat(PSTAT_SETCMD, un, len, 0, 0);
2906 if (PL_origalen > 1) {
2907 /* PL_origalen is set in perl_parse(). */
2908 s = SvPV_force(sv,len);
2909 if (len >= (STRLEN)PL_origalen-1) {
2910 /* Longer than original, will be truncated. We assume that
2911 * PL_origalen bytes are available. */
2912 Copy(s, PL_origargv[0], PL_origalen-1, char);
2915 /* Shorter than original, will be padded. */
2917 /* Special case for Mac OS X: see [perl #38868] */
2920 /* Is the space counterintuitive? Yes.
2921 * (You were expecting \0?)
2922 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2924 const int pad = ' ';
2926 Copy(s, PL_origargv[0], len, char);
2927 PL_origargv[0][len] = 0;
2928 memset(PL_origargv[0] + len + 1,
2929 pad, PL_origalen - len - 1);
2931 PL_origargv[0][PL_origalen-1] = 0;
2932 for (i = 1; i < PL_origargc; i++)
2934 #ifdef HAS_PRCTL_SET_NAME
2935 /* Set the legacy process name in addition to the POSIX name on Linux */
2936 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2937 /* diag_listed_as: SKIPME */
2938 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2943 UNLOCK_DOLLARZERO_MUTEX;
2950 Perl_whichsig(pTHX_ const char *sig)
2952 register char* const* sigv;
2954 PERL_ARGS_ASSERT_WHICHSIG;
2955 PERL_UNUSED_CONTEXT;
2957 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2958 if (strEQ(sig,*sigv))
2959 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2961 if (strEQ(sig,"CHLD"))
2965 if (strEQ(sig,"CLD"))
2972 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2973 Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
2975 Perl_sighandler(int sig)
2978 #ifdef PERL_GET_SIG_CONTEXT
2979 dTHXa(PERL_GET_SIG_CONTEXT);
2986 SV * const tSv = PL_Sv;
2990 XPV * const tXpv = PL_Xpv;
2991 I32 old_ss_ix = PL_savestack_ix;
2994 if (!PL_psig_ptr[sig]) {
2995 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3000 /* Max number of items pushed there is 3*n or 4. We cannot fix
3001 infinity, so we fix 4 (in fact 5): */
3002 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3004 PL_savestack_ix += 5; /* Protect save in progress. */
3005 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3007 if (PL_markstack_ptr < PL_markstack_max - 2) {
3009 PL_markstack_ptr++; /* Protect mark. */
3011 if (PL_scopestack_ix < PL_scopestack_max - 3) {
3015 /* sv_2cv is too complicated, try a simpler variant first: */
3016 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3017 || SvTYPE(cv) != SVt_PVCV) {
3019 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3022 if (!cv || !CvROOT(cv)) {
3023 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3024 PL_sig_name[sig], (gv ? GvENAME(gv)
3031 sv = PL_psig_name[sig]
3032 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3033 : newSVpv(PL_sig_name[sig],0);
3037 /* make sure our assumption about the size of the SAVEs are correct:
3038 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3039 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3041 PUSHSTACKi(PERLSI_SIGNAL);
3044 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3046 struct sigaction oact;
3048 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3051 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3052 /* The siginfo fields signo, code, errno, pid, uid,
3053 * addr, status, and band are defined by POSIX/SUSv3. */
3054 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3055 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3056 #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. */
3057 hv_stores(sih, "errno", newSViv(sip->si_errno));
3058 hv_stores(sih, "status", newSViv(sip->si_status));
3059 hv_stores(sih, "uid", newSViv(sip->si_uid));
3060 hv_stores(sih, "pid", newSViv(sip->si_pid));
3061 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3062 hv_stores(sih, "band", newSViv(sip->si_band));
3066 mPUSHp((char *)sip, sizeof(*sip));
3074 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3077 if (SvTRUE(ERRSV)) {
3079 #ifdef HAS_SIGPROCMASK
3080 /* Handler "died", for example to get out of a restart-able read().
3081 * Before we re-do that on its behalf re-enable the signal which was
3082 * blocked by the system when we entered.
3086 sigaddset(&set,sig);
3087 sigprocmask(SIG_UNBLOCK, &set, NULL);
3089 /* Not clear if this will work */
3090 (void)rsignal(sig, SIG_IGN);
3091 (void)rsignal(sig, PL_csighandlerp);
3093 #endif /* !PERL_MICRO */
3097 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3098 PL_savestack_ix = old_ss_ix;
3102 PL_scopestack_ix -= 1;
3105 PL_op = myop; /* Apparently not needed... */
3107 PL_Sv = tSv; /* Restore global temporaries. */
3114 S_restore_magic(pTHX_ const void *p)
3117 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3118 SV* const sv = mgs->mgs_sv;
3123 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3125 #ifdef PERL_OLD_COPY_ON_WRITE
3126 /* While magic was saved (and off) sv_setsv may well have seen
3127 this SV as a prime candidate for COW. */
3129 sv_force_normal_flags(sv, 0);
3132 if (mgs->mgs_readonly)
3134 if (mgs->mgs_magical)
3135 SvFLAGS(sv) |= mgs->mgs_magical;
3138 if (SvGMAGICAL(sv)) {
3139 /* downgrade public flags to private,
3140 and discard any other private flags */
3142 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3144 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3145 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
3150 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3152 /* If we're still on top of the stack, pop us off. (That condition
3153 * will be satisfied if restore_magic was called explicitly, but *not*
3154 * if it's being called via leave_scope.)
3155 * The reason for doing this is that otherwise, things like sv_2cv()
3156 * may leave alloc gunk on the savestack, and some code
3157 * (e.g. sighandler) doesn't expect that...
3159 if (PL_savestack_ix == mgs->mgs_ss_ix)
3161 UV popval = SSPOPUV;
3162 assert(popval == SAVEt_DESTRUCTOR_X);
3163 PL_savestack_ix -= 2;
3165 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3166 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3168 if (SvREFCNT(sv) == 1) {
3169 /* We hold the last reference to this SV, which implies that the
3170 SV was deleted as a side effect of the routines we called.
3171 So artificially keep it alive a bit longer.
3172 We avoid turning on the TEMP flag, which can cause the SV's
3173 buffer to get stolen (and maybe other stuff). */
3174 int was_temp = SvTEMP(sv);
3182 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
3185 /* clean up the mess created by Perl_sighandler().
3186 * Note that this is only called during an exit in a signal handler;
3187 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3188 * skipped over. This is why we don't need to fix up the markstack and
3189 * scopestack - they're going to be set to 0 anyway */
3192 S_unwind_handler_stack(pTHX_ const void *p)
3197 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3201 =for apidoc magic_sethint
3203 Triggered by a store to %^H, records the key/value pair to
3204 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3205 anything that would need a deep copy. Maybe we should warn if we find a
3211 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3214 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3215 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3217 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3219 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3220 an alternative leaf in there, with PL_compiling.cop_hints being used if
3221 it's NULL. If needed for threads, the alternative could lock a mutex,
3222 or take other more complex action. */
3224 /* Something changed in %^H, so it will need to be restored on scope exit.
3225 Doing this here saves a lot of doing it manually in perl code (and
3226 forgetting to do it, and consequent subtle errors. */
3227 PL_hints |= HINT_LOCALIZE_HH;
3228 CopHINTHASH_set(&PL_compiling,
3229 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3234 =for apidoc magic_clearhint
3236 Triggered by a delete from %^H, records the key to
3237 C<PL_compiling.cop_hints_hash>.
3242 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3246 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3247 PERL_UNUSED_ARG(sv);
3249 assert(mg->mg_len == HEf_SVKEY);
3251 PERL_UNUSED_ARG(sv);
3253 PL_hints |= HINT_LOCALIZE_HH;
3254 CopHINTHASH_set(&PL_compiling,
3255 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3256 MUTABLE_SV(mg->mg_ptr), 0, 0));
3261 =for apidoc magic_clearhints
3263 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3268 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3270 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3271 PERL_UNUSED_ARG(sv);
3272 PERL_UNUSED_ARG(mg);
3273 cophh_free(CopHINTHASH_get(&PL_compiling));
3274 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3280 * c-indentation-style: bsd
3282 * indent-tabs-mode: t
3285 * ex: set ts=8 sts=4 sw=4 noet: