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
20 "Magic" is special data attached to SV structures in order to give them
21 "magical" properties. When any Perl code tries to read from, or assign to,
22 an SV marked as magical, it calls the 'get' or 'set' function associated
23 with that SV's magic. A get is called prior to reading an SV, in order to
24 give it a chance to update its internal value (get on $. writes the line
25 number of the last read filehandle into the SV's IV slot), while
26 set is called after an SV has been written to, in order to allow it to make
27 use of its changed value (set on $/ copies the SV's new value to the
28 PL_rs global variable).
30 Magic is implemented as a linked list of MAGIC structures attached to the
31 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
32 of functions that implement the get(), set(), length() etc functions,
33 plus space for some flags and pointers. For example, a tied variable has
34 a MAGIC structure that contains a pointer to the object associated with the
46 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
52 #if defined(HAS_SETGROUPS)
59 # include <sys/pstat.h>
62 #ifdef HAS_PRCTL_SET_NAME
63 # include <sys/prctl.h>
67 /* Missing protos on LynxOS */
68 void setruid(uid_t id);
69 void seteuid(uid_t id);
70 void setrgid(uid_t id);
71 void setegid(uid_t id);
75 * Pre-magic setup and post-magic takedown.
76 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
85 /* MGS is typedef'ed to struct magic_state in perl.h */
88 S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
93 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
95 assert(SvMAGICAL(sv));
97 /* we shouldn't really be called here with RC==0, but it can sometimes
98 * happen via mg_clear() (which also shouldn't be called when RC==0,
99 * but it can happen). Handle this case gracefully(ish) by not RC++
100 * and thus avoiding the resultant double free */
101 if (SvREFCNT(sv) > 0) {
102 /* guard against sv getting freed midway through the mg clearing,
103 * by holding a private reference for the duration. */
104 SvREFCNT_inc_simple_void_NN(sv);
108 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
110 mgs = SSPTR(mgs_ix, MGS*);
112 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
113 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
114 mgs->mgs_bumped = bumped;
116 SvFLAGS(sv) &= ~flags;
120 #define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
123 =for apidoc mg_magical
125 Turns on the magical status of an SV. See C<L</sv_magic>>.
131 Perl_mg_magical(SV *sv)
134 PERL_ARGS_ASSERT_MG_MAGICAL;
137 if ((mg = SvMAGIC(sv))) {
139 const MGVTBL* const vtbl = mg->mg_virtual;
141 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
148 } while ((mg = mg->mg_moremagic));
149 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
157 Do magic before a value is retrieved from the SV. The type of SV must
158 be >= C<SVt_PVMG>. See C<L</sv_magic>>.
164 Perl_mg_get(pTHX_ SV *sv)
166 const I32 mgs_ix = SSNEW(sizeof(MGS));
169 bool taint_only = TRUE; /* the only get method seen is taint */
170 MAGIC *newmg, *head, *cur, *mg;
172 PERL_ARGS_ASSERT_MG_GET;
174 if (PL_localizing == 1 && sv == DEFSV) return 0;
176 /* We must call svt_get(sv, mg) for each valid entry in the linked
177 list of magic. svt_get() may delete the current entry, add new
178 magic to the head of the list, or upgrade the SV. AMS 20010810 */
180 newmg = cur = head = mg = SvMAGIC(sv);
182 const MGVTBL * const vtbl = mg->mg_virtual;
183 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
185 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
187 /* taint's mg get is so dumb it doesn't need flag saving */
188 if (mg->mg_type != PERL_MAGIC_taint) {
191 save_magic(mgs_ix, sv);
196 vtbl->svt_get(aTHX_ sv, mg);
198 /* guard against magic having been deleted - eg FETCH calling
201 /* recalculate flags */
202 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
206 /* recalculate flags if this entry was deleted. */
207 if (mg->mg_flags & MGf_GSKIP)
208 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
209 ~(SVs_GMG|SVs_SMG|SVs_RMG);
211 else if (vtbl == &PL_vtbl_utf8) {
212 /* get-magic can reallocate the PV, unless there's only taint
216 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
217 if ( mg2->mg_type != PERL_MAGIC_taint
218 && !(mg2->mg_flags & MGf_GSKIP)
220 && mg2->mg_virtual->svt_get
228 magic_setutf8(sv, mg);
234 /* Have we finished with the new entries we saw? Start again
235 where we left off (unless there are more new entries). */
243 /* Were any new entries added? */
244 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
248 /* recalculate flags */
249 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
254 restore_magic(INT2PTR(void *, (IV)mgs_ix));
262 Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
268 Perl_mg_set(pTHX_ SV *sv)
270 const I32 mgs_ix = SSNEW(sizeof(MGS));
274 PERL_ARGS_ASSERT_MG_SET;
276 if (PL_localizing == 2 && sv == DEFSV) return 0;
278 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
280 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
281 const MGVTBL* vtbl = mg->mg_virtual;
282 nextmg = mg->mg_moremagic; /* it may delete itself */
283 if (mg->mg_flags & MGf_GSKIP) {
284 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
285 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
287 if (PL_localizing == 2
288 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
290 if (vtbl && vtbl->svt_set)
291 vtbl->svt_set(aTHX_ sv, mg);
294 restore_magic(INT2PTR(void*, (IV)mgs_ix));
299 =for apidoc mg_length
301 Reports on the SV's length in bytes, calling length magic if available,
302 but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
303 magic if there is no 'length' magic, but with no indication as to
304 whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
305 higher. Use C<sv_len()> instead.
311 Perl_mg_length(pTHX_ SV *sv)
316 PERL_ARGS_ASSERT_MG_LENGTH;
318 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
319 const MGVTBL * const vtbl = mg->mg_virtual;
320 if (vtbl && vtbl->svt_len) {
321 const I32 mgs_ix = SSNEW(sizeof(MGS));
322 save_magic(mgs_ix, sv);
323 /* omit MGf_GSKIP -- not changed here */
324 len = vtbl->svt_len(aTHX_ sv, mg);
325 restore_magic(INT2PTR(void*, (IV)mgs_ix));
330 (void)SvPV_const(sv, len);
335 Perl_mg_size(pTHX_ SV *sv)
339 PERL_ARGS_ASSERT_MG_SIZE;
341 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
342 const MGVTBL* const vtbl = mg->mg_virtual;
343 if (vtbl && vtbl->svt_len) {
344 const I32 mgs_ix = SSNEW(sizeof(MGS));
346 save_magic(mgs_ix, sv);
347 /* omit MGf_GSKIP -- not changed here */
348 len = vtbl->svt_len(aTHX_ sv, mg);
349 restore_magic(INT2PTR(void*, (IV)mgs_ix));
356 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
360 Perl_croak(aTHX_ "Size magic not implemented");
363 NOT_REACHED; /* NOTREACHED */
369 Clear something magical that the SV represents. See C<L</sv_magic>>.
375 Perl_mg_clear(pTHX_ SV *sv)
377 const I32 mgs_ix = SSNEW(sizeof(MGS));
381 PERL_ARGS_ASSERT_MG_CLEAR;
383 save_magic(mgs_ix, sv);
385 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
386 const MGVTBL* const vtbl = mg->mg_virtual;
387 /* omit GSKIP -- never set here */
389 nextmg = mg->mg_moremagic; /* it may delete itself */
391 if (vtbl && vtbl->svt_clear)
392 vtbl->svt_clear(aTHX_ sv, mg);
395 restore_magic(INT2PTR(void*, (IV)mgs_ix));
400 S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
407 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
408 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
420 Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
426 Perl_mg_find(const SV *sv, int type)
428 return S_mg_findext_flags(sv, type, NULL, 0);
432 =for apidoc mg_findext
434 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
441 Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
443 return S_mg_findext_flags(sv, type, vtbl, 1);
447 Perl_mg_find_mglob(pTHX_ SV *sv)
449 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
450 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
451 /* This sv is only a delegate. //g magic must be attached to
456 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
457 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
464 Copies the magic from one SV to another. See C<L</sv_magic>>.
470 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
475 PERL_ARGS_ASSERT_MG_COPY;
477 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
478 const MGVTBL* const vtbl = mg->mg_virtual;
479 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
480 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
483 const char type = mg->mg_type;
484 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
486 (type == PERL_MAGIC_tied)
489 toLOWER(type), key, klen);
498 =for apidoc mg_localize
500 Copy some of the magic from an existing SV to new localized version of that
501 SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
502 gets copied, value magic doesn't (I<e.g.>,
505 If C<setmagic> is false then no set magic will be called on the new (empty) SV.
506 This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
507 and that will handle the magic.
513 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
517 PERL_ARGS_ASSERT_MG_LOCALIZE;
522 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
523 const MGVTBL* const vtbl = mg->mg_virtual;
524 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
527 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
528 (void)vtbl->svt_local(aTHX_ nsv, mg);
530 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
531 mg->mg_ptr, mg->mg_len);
533 /* container types should remain read-only across localization */
534 SvFLAGS(nsv) |= SvREADONLY(sv);
537 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
538 SvFLAGS(nsv) |= SvMAGICAL(sv);
547 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
549 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
551 const MGVTBL* const vtbl = mg->mg_virtual;
552 if (vtbl && vtbl->svt_free)
553 vtbl->svt_free(aTHX_ sv, mg);
555 if (mg->mg_type == PERL_MAGIC_collxfrm && mg->mg_len >= 0)
556 /* collate magic uses string len not buffer len, so
557 * free even with mg_len == 0 */
558 Safefree(mg->mg_ptr);
559 else if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
566 if (mg->mg_flags & MGf_REFCOUNTED)
567 SvREFCNT_dec(mg->mg_obj);
574 Free any magic storage used by the SV. See C<L</sv_magic>>.
580 Perl_mg_free(pTHX_ SV *sv)
585 PERL_ARGS_ASSERT_MG_FREE;
587 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
588 moremagic = mg->mg_moremagic;
589 mg_free_struct(sv, mg);
590 SvMAGIC_set(sv, moremagic);
592 SvMAGIC_set(sv, NULL);
598 =for apidoc mg_free_type
600 Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
606 Perl_mg_free_type(pTHX_ SV *sv, int how)
608 MAGIC *mg, *prevmg, *moremg;
609 PERL_ARGS_ASSERT_MG_FREE_TYPE;
610 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
611 moremg = mg->mg_moremagic;
612 if (mg->mg_type == how) {
614 /* temporarily move to the head of the magic chain, in case
615 custom free code relies on this historical aspect of mg_free */
617 prevmg->mg_moremagic = moremg;
618 mg->mg_moremagic = SvMAGIC(sv);
621 newhead = mg->mg_moremagic;
622 mg_free_struct(sv, mg);
623 SvMAGIC_set(sv, newhead);
631 =for apidoc mg_freeext
633 Remove any magic of type C<how> using virtual table C<vtbl> from the
634 SV C<sv>. See L</sv_magic>.
636 C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
642 Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
644 MAGIC *mg, *prevmg, *moremg;
645 PERL_ARGS_ASSERT_MG_FREEEXT;
646 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
648 moremg = mg->mg_moremagic;
649 if (mg->mg_type == how && (vtbl == NULL || mg->mg_virtual == vtbl)) {
650 /* temporarily move to the head of the magic chain, in case
651 custom free code relies on this historical aspect of mg_free */
653 prevmg->mg_moremagic = moremg;
654 mg->mg_moremagic = SvMAGIC(sv);
657 newhead = mg->mg_moremagic;
658 mg_free_struct(sv, mg);
659 SvMAGIC_set(sv, newhead);
669 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
673 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
676 REGEXP * const rx = PM_GETRE(PL_curpm);
678 const SSize_t n = (SSize_t)mg->mg_obj;
679 if (n == '+') { /* @+ */
680 /* return the number possible */
681 return RX_NPARENS(rx);
682 } else { /* @- @^CAPTURE @{^CAPTURE} */
683 I32 paren = RX_LASTPAREN(rx);
685 /* return the last filled */
687 && (RX_OFFS(rx)[paren].start == -1
688 || RX_OFFS(rx)[paren].end == -1) )
694 /* @^CAPTURE @{^CAPTURE} */
695 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
707 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
709 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
712 REGEXP * const rx = PM_GETRE(PL_curpm);
714 const SSize_t n = (SSize_t)mg->mg_obj;
715 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
716 const I32 paren = mg->mg_len
717 + (n == '\003' ? 1 : 0);
722 if (paren <= (I32)RX_NPARENS(rx) &&
723 (s = RX_OFFS(rx)[paren].start) != -1 &&
724 (t = RX_OFFS(rx)[paren].end) != -1)
728 if (n == '+') /* @+ */
730 else if (n == '-') /* @- */
732 else { /* @^CAPTURE @{^CAPTURE} */
733 CALLREG_NUMBUF_FETCH(rx,paren,sv);
737 if (RX_MATCH_UTF8(rx)) {
738 const char * const b = RX_SUBBEG(rx);
740 i = RX_SUBCOFFSET(rx) +
742 (U8*)(b-RX_SUBOFFSET(rx)+i));
757 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
759 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
763 Perl_croak_no_modify();
764 NORETURN_FUNCTION_END;
767 #define SvRTRIM(sv) STMT_START { \
769 STRLEN len = SvCUR(sv); \
770 char * const p = SvPVX(sv); \
771 while (len > 0 && isSPACE(p[len-1])) \
773 SvCUR_set(sv, len); \
779 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
781 PERL_ARGS_ASSERT_EMULATE_COP_IO;
783 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
788 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
789 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
794 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
795 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
803 S_fixup_errno_string(pTHX_ SV* sv)
805 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
808 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
812 if(strEQ(SvPVX(sv), "")) {
813 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
817 /* In some locales the error string may come back as UTF-8, in which
818 * case we should turn on that flag. This didn't use to happen, and to
819 * avoid as many possible backward compatibility issues as possible, we
820 * don't turn on the flag unless we have to. So the flag stays off for
821 * an entirely invariant string. We assume that if the string looks
822 * like UTF-8 in a single script, it really is UTF-8: "text in any
823 * other encoding that uses bytes with the high bit set is extremely
824 * unlikely to pass a UTF-8 validity test"
825 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
826 * potential that we will get it wrong however, especially on short
827 * error message text, so do an additional check. */
828 if ( ! IN_BYTES /* respect 'use bytes' */
829 && is_utf8_non_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
831 #ifdef USE_LOCALE_MESSAGES
833 && _is_cur_LC_category_utf8(LC_MESSAGES)
835 #else /* If can't check directly, at least can see if script is consistent,
836 under UTF-8, which gives us an extra measure of confidence. */
838 && isSCRIPT_RUN((const U8 *) SvPVX_const(sv), (U8 *) SvEND(sv),
839 TRUE) /* Means assume UTF-8 */
849 =for apidoc sv_string_from_errnum
851 Generates the message string describing an OS error and returns it as
852 an SV. C<errnum> must be a value that C<errno> could take, identifying
855 If C<tgtsv> is non-null then the string will be written into that SV
856 (overwriting existing content) and it will be returned. If C<tgtsv>
857 is a null pointer then the string will be written into a new mortal SV
858 which will be returned.
860 The message will be taken from whatever locale would be used by C<$!>,
861 and will be encoded in the SV in whatever manner would be used by C<$!>.
862 The details of this process are subject to future change. Currently,
863 the message is taken from the C locale by default (usually producing an
864 English message), and from the currently selected locale when in the scope
865 of the C<use locale> pragma. A heuristic attempt is made to decode the
866 message from the locale's character encoding, but it will only be decoded
867 as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
868 locale, usually in an ISO-8859-1 locale, and never in any other locale.
870 The SV is always returned containing an actual string, and with no other
871 OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
872 (meaning success), and if no useful message is available then a useless
873 string (currently empty) is returned.
879 Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
883 tgtsv = sv_newmortal();
884 errstr = my_strerror(errnum);
886 sv_setpv(tgtsv, errstr);
887 fixup_errno_string(tgtsv);
900 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
903 const char *s = NULL;
905 const char * const remaining = mg->mg_ptr + 1;
908 PERL_ARGS_ASSERT_MAGIC_GET;
912 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
914 CALLREG_NUMBUF_FETCH(rx,paren,sv);
921 nextchar = *remaining;
922 switch (*mg->mg_ptr) {
923 case '\001': /* ^A */
924 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
927 if (SvTAINTED(PL_bodytarget))
930 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
931 if (nextchar == '\0') {
932 sv_setiv(sv, (IV)PL_minus_c);
934 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
935 sv_setiv(sv, (IV)STATUS_NATIVE);
939 case '\004': /* ^D */
940 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
942 case '\005': /* ^E */
943 if (nextchar != '\0') {
944 if (strEQ(remaining, "NCODING"))
949 #if defined(VMS) || defined(OS2) || defined(WIN32)
953 $DESCRIPTOR(msgdsc,msg);
954 sv_setnv(sv,(NV) vaxc$errno);
955 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
956 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
961 if (!(_emx_env & 0x200)) { /* Under DOS */
962 sv_setnv(sv, (NV)errno);
963 sv_setpv(sv, errno ? my_strerror(errno) : "");
965 if (errno != errno_isOS2) {
966 const int tmp = _syserrno();
967 if (tmp) /* 2nd call to _syserrno() makes it 0 */
970 sv_setnv(sv, (NV)Perl_rc);
971 sv_setpv(sv, os2error(Perl_rc));
973 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
974 fixup_errno_string(sv);
976 # elif defined(WIN32)
978 const DWORD dwErr = GetLastError();
979 sv_setnv(sv, (NV)dwErr);
981 PerlProc_GetOSError(sv, dwErr);
982 fixup_errno_string(sv);
989 # error Missing code for platform
992 SvNOK_on(sv); /* what a wonderful hack! */
994 #endif /* End of platforms with special handling for $^E; others just fall
1002 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1004 sv_setnv(sv, (NV)errno);
1007 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1008 sv_setpv(sv, os2error(Perl_rc));
1015 sv_string_from_errnum(errno, sv);
1016 /* If no useful string is available, don't
1017 * claim to have a string part. The SvNOK_on()
1018 * below will cause just the number part to be valid */
1026 SvNOK_on(sv); /* what a wonderful hack! */
1029 case '\006': /* ^F */
1030 if (nextchar == '\0') {
1031 sv_setiv(sv, (IV)PL_maxsysfd);
1034 case '\007': /* ^GLOBAL_PHASE */
1035 if (strEQ(remaining, "LOBAL_PHASE")) {
1036 sv_setpvn(sv, PL_phase_names[PL_phase],
1037 strlen(PL_phase_names[PL_phase]));
1040 case '\010': /* ^H */
1041 sv_setuv(sv, PL_hints);
1043 case '\011': /* ^I */ /* NOT \t in EBCDIC */
1044 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
1046 case '\014': /* ^LAST_FH */
1047 if (strEQ(remaining, "AST_FH")) {
1048 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
1049 assert(isGV_with_GP(PL_last_in_gv));
1050 SV_CHECK_THINKFIRST_COW_DROP(sv);
1051 prepare_SV_for_RV(sv);
1053 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1061 case '\017': /* ^O & ^OPEN */
1062 if (nextchar == '\0') {
1063 sv_setpv(sv, PL_osname);
1066 else if (strEQ(remaining, "PEN")) {
1067 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
1071 sv_setiv(sv, (IV)PL_perldb);
1073 case '\023': /* ^S */
1074 if (nextchar == '\0') {
1075 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
1077 else if (PL_in_eval)
1078 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
1082 else if (strEQ(remaining, "AFE_LOCALES")) {
1084 #if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1086 sv_setuv(sv, (UV) 1);
1089 sv_setuv(sv, (UV) 0);
1095 case '\024': /* ^T */
1096 if (nextchar == '\0') {
1098 sv_setnv(sv, PL_basetime);
1100 sv_setiv(sv, (IV)PL_basetime);
1103 else if (strEQ(remaining, "AINT"))
1104 sv_setiv(sv, TAINTING_get
1105 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
1108 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
1109 if (strEQ(remaining, "NICODE"))
1110 sv_setuv(sv, (UV) PL_unicode);
1111 else if (strEQ(remaining, "TF8LOCALE"))
1112 sv_setuv(sv, (UV) PL_utf8locale);
1113 else if (strEQ(remaining, "TF8CACHE"))
1114 sv_setiv(sv, (IV) PL_utf8cache);
1116 case '\027': /* ^W & $^WARNING_BITS */
1117 if (nextchar == '\0')
1118 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
1119 else if (strEQ(remaining, "ARNING_BITS")) {
1120 if (PL_compiling.cop_warnings == pWARN_NONE) {
1121 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
1123 else if (PL_compiling.cop_warnings == pWARN_STD) {
1126 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1127 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1130 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1131 *PL_compiling.cop_warnings);
1135 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1136 sv_setiv(sv, w32_sloppystat);
1141 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1142 paren = RX_LASTPAREN(rx);
1144 goto do_numbuf_fetch;
1147 case '\016': /* ^N */
1148 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1149 paren = RX_LASTCLOSEPAREN(rx);
1151 goto do_numbuf_fetch;
1155 if (GvIO(PL_last_in_gv)) {
1156 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1161 sv_setiv(sv, (IV)STATUS_CURRENT);
1162 #ifdef COMPLEX_STATUS
1163 SvUPGRADE(sv, SVt_PVLV);
1164 LvTARGOFF(sv) = PL_statusvalue;
1165 LvTARGLEN(sv) = PL_statusvalue_vms;
1170 if (GvIOp(PL_defoutgv))
1171 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1175 sv_setpv(sv,GvENAME(PL_defoutgv));
1176 sv_catpvs(sv,"_TOP");
1180 if (GvIOp(PL_defoutgv))
1181 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1183 s = GvENAME(PL_defoutgv);
1187 if (GvIO(PL_defoutgv))
1188 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1191 if (GvIO(PL_defoutgv))
1192 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1195 if (GvIO(PL_defoutgv))
1196 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1205 if (GvIO(PL_defoutgv))
1206 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1210 sv_copypv(sv, PL_ors_sv);
1216 IV const pid = (IV)PerlProc_getpid();
1217 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1218 /* never set manually, or at least not since last fork */
1220 /* never unsafe, even if reading in a tainted expression */
1223 /* else a value has been assigned manually, so do nothing */
1227 sv_setuid(sv, PerlProc_getuid());
1230 sv_setuid(sv, PerlProc_geteuid());
1233 sv_setgid(sv, PerlProc_getgid());
1236 sv_setgid(sv, PerlProc_getegid());
1238 #ifdef HAS_GETGROUPS
1240 Groups_t *gary = NULL;
1241 I32 num_groups = getgroups(0, gary);
1242 if (num_groups > 0) {
1244 Newx(gary, num_groups, Groups_t);
1245 num_groups = getgroups(num_groups, gary);
1246 for (i = 0; i < num_groups; i++)
1247 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
1251 (void)SvIOK_on(sv); /* what a wonderful hack! */
1265 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1267 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1269 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1271 if (uf && uf->uf_val)
1272 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1277 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1279 STRLEN len = 0, klen;
1280 const char * const key = MgPV_const(mg,klen);
1283 PERL_ARGS_ASSERT_MAGIC_SETENV;
1287 /* defined environment variables are byte strings; unfortunately
1288 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1289 (void)SvPV_force_nomg_nolen(sv);
1290 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1292 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1298 my_setenv(key, s); /* does the deed */
1300 #ifdef DYNAMIC_ENV_FETCH
1301 /* We just undefd an environment var. Is a replacement */
1302 /* waiting in the wings? */
1304 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1306 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1310 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1311 /* And you'll never guess what the dog had */
1312 /* in its mouth... */
1314 MgTAINTEDDIR_off(mg);
1316 if (s && memEQs(key, klen, "DCL$PATH")) {
1317 char pathbuf[256], eltbuf[256], *cp, *elt;
1320 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1322 do { /* DCL$PATH may be a search list */
1323 while (1) { /* as may dev portion of any element */
1324 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1325 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1326 cando_by_name(S_IWUSR,0,elt) ) {
1327 MgTAINTEDDIR_on(mg);
1331 if ((cp = strchr(elt, ':')) != NULL)
1333 if (my_trnlnm(elt, eltbuf, j++))
1339 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1342 if (s && memEQs(key, klen, "PATH")) {
1343 const char * const strend = s + len;
1345 /* set MGf_TAINTEDDIR if any component of the new path is
1346 * relative or world-writeable */
1347 while (s < strend) {
1351 #ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1352 const char path_sep = PL_perllib_sep;
1354 const char path_sep = ':';
1356 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
1357 s, strend, path_sep, &i);
1359 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1361 /* no colon thus no device name -- assume relative path */
1362 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1363 /* Using Unix separator, e.g. under bash, so act line Unix */
1364 || (PL_perllib_sep == ':' && *tmpbuf != '/')
1366 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1368 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1369 MgTAINTEDDIR_on(mg);
1375 #endif /* neither OS2 nor WIN32 nor MSDOS */
1381 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1383 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1384 PERL_UNUSED_ARG(sv);
1385 my_setenv(MgPV_nolen_const(mg),NULL);
1390 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1392 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1393 PERL_UNUSED_ARG(mg);
1395 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1397 if (PL_localizing) {
1400 hv_iterinit(MUTABLE_HV(sv));
1401 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1403 my_setenv(hv_iterkey(entry, &keylen),
1404 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1412 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1414 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1415 PERL_UNUSED_ARG(sv);
1416 PERL_UNUSED_ARG(mg);
1418 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1426 #ifdef HAS_SIGPROCMASK
1428 restore_sigmask(pTHX_ SV *save_sv)
1430 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1431 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1435 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1437 /* Are we fetching a signal entry? */
1438 int i = (I16)mg->mg_private;
1440 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1444 const char * sig = MgPV_const(mg, siglen);
1445 mg->mg_private = i = whichsig_pvn(sig, siglen);
1450 sv_setsv(sv,PL_psig_ptr[i]);
1452 Sighandler_t sigstate = rsignal_state(i);
1453 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1454 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1457 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1458 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1461 /* cache state so we don't fetch it again */
1462 if(sigstate == (Sighandler_t) SIG_IGN)
1463 sv_setpvs(sv,"IGNORE");
1466 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1473 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1475 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1477 magic_setsig(NULL, mg);
1478 return sv_unmagic(sv, mg->mg_type);
1482 #ifdef PERL_USE_3ARG_SIGHANDLER
1484 Perl_csighandler(int sig, Siginfo_t *sip, void *uap)
1486 Perl_csighandler3(sig, sip, uap);
1490 Perl_csighandler(int sig)
1492 Perl_csighandler3(sig, NULL, NULL);
1497 Perl_csighandler1(int sig)
1499 Perl_csighandler3(sig, NULL, NULL);
1502 /* Handler intended to directly handle signal calls from the kernel.
1503 * (Depending on configuration, the kernel may actually call one of the
1504 * wrappers csighandler() or csighandler1() instead.)
1505 * It either queues up the signal or dispatches it immediately depending
1506 * on whether safe signals are enabled and whether the signal is capable
1507 * of being deferred (e.g. SEGV isn't).
1511 Perl_csighandler3(int sig, Siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1513 #ifdef PERL_GET_SIG_CONTEXT
1514 dTHXa(PERL_GET_SIG_CONTEXT);
1519 #ifdef PERL_USE_3ARG_SIGHANDLER
1520 #if defined(__cplusplus) && defined(__GNUC__)
1521 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1522 * parameters would be warned about. */
1523 PERL_UNUSED_ARG(sip);
1524 PERL_UNUSED_ARG(uap);
1528 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1529 (void) rsignal(sig, PL_csighandlerp);
1530 if (PL_sig_ignoring[sig]) return;
1532 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1533 if (PL_sig_defaulting[sig])
1534 #ifdef KILL_BY_SIGPRC
1535 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1550 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1551 /* Call the perl level handler now--
1552 * with risk we may be in malloc() or being destructed etc. */
1554 if (PL_sighandlerp == Perl_sighandler)
1555 /* default handler, so can call perly_sighandler() directly
1556 * rather than via Perl_sighandler, passing the extra
1557 * 'safe = false' arg
1559 Perl_perly_sighandler(sig, NULL, NULL, 0 /* unsafe */);
1561 #ifdef PERL_USE_3ARG_SIGHANDLER
1562 (*PL_sighandlerp)(sig, NULL, NULL);
1564 (*PL_sighandlerp)(sig);
1568 if (!PL_psig_pend) return;
1569 /* Set a flag to say this signal is pending, that is awaiting delivery after
1570 * the current Perl opcode completes */
1571 PL_psig_pend[sig]++;
1573 #ifndef SIG_PENDING_DIE_COUNT
1574 # define SIG_PENDING_DIE_COUNT 120
1576 /* Add one to say _a_ signal is pending */
1577 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1578 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1579 (unsigned long)SIG_PENDING_DIE_COUNT);
1583 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1585 Perl_csighandler_init(void)
1588 if (PL_sig_handlers_initted) return;
1590 for (sig = 1; sig < SIG_SIZE; sig++) {
1591 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1593 PL_sig_defaulting[sig] = 1;
1594 (void) rsignal(sig, PL_csighandlerp);
1596 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1597 PL_sig_ignoring[sig] = 0;
1600 PL_sig_handlers_initted = 1;
1604 #if defined HAS_SIGPROCMASK
1606 unblock_sigmask(pTHX_ void* newset)
1608 PERL_UNUSED_CONTEXT;
1609 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1614 Perl_despatch_signals(pTHX)
1618 for (sig = 1; sig < SIG_SIZE; sig++) {
1619 if (PL_psig_pend[sig]) {
1621 #ifdef HAS_SIGPROCMASK
1622 /* From sigaction(2) (FreeBSD man page):
1623 * | Signal routines normally execute with the signal that
1624 * | caused their invocation blocked, but other signals may
1626 * Emulation of this behavior (from within Perl) is enabled
1630 sigset_t newset, oldset;
1632 sigemptyset(&newset);
1633 sigaddset(&newset, sig);
1634 sigprocmask(SIG_BLOCK, &newset, &oldset);
1635 was_blocked = sigismember(&oldset, sig);
1637 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1639 SAVEFREESV(save_sv);
1640 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1643 PL_psig_pend[sig] = 0;
1644 if (PL_sighandlerp == Perl_sighandler)
1645 /* default handler, so can call perly_sighandler() directly
1646 * rather than via Perl_sighandler, passing the extra
1649 Perl_perly_sighandler(sig, NULL, NULL, 1 /* safe */);
1651 #ifdef PERL_USE_3ARG_SIGHANDLER
1652 (*PL_sighandlerp)(sig, NULL, NULL);
1654 (*PL_sighandlerp)(sig);
1657 #ifdef HAS_SIGPROCMASK
1666 /* sv of NULL signifies that we're acting as magic_clearsig. */
1668 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1673 /* Need to be careful with SvREFCNT_dec(), because that can have side
1674 * effects (due to closures). We must make sure that the new disposition
1675 * is in place before it is called.
1679 #ifdef HAS_SIGPROCMASK
1683 const char *s = MgPV_const(mg,len);
1685 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1688 if (memEQs(s, len, "__DIE__"))
1690 else if (memEQs(s, len, "__WARN__")
1691 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1692 /* Merge the existing behaviours, which are as follows:
1693 magic_setsig, we always set svp to &PL_warnhook
1694 (hence we always change the warnings handler)
1695 For magic_clearsig, we don't change the warnings handler if it's
1696 set to the &PL_warnhook. */
1699 SV *tmp = sv_newmortal();
1700 Perl_croak(aTHX_ "No such hook: %s",
1701 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1705 if (*svp != PERL_WARNHOOK_FATAL)
1711 i = (I16)mg->mg_private;
1713 i = whichsig_pvn(s, len); /* ...no, a brick */
1714 mg->mg_private = (U16)i;
1718 SV *tmp = sv_newmortal();
1719 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1720 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1724 #ifdef HAS_SIGPROCMASK
1725 /* Avoid having the signal arrive at a bad time, if possible. */
1728 sigprocmask(SIG_BLOCK, &set, &save);
1730 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1731 SAVEFREESV(save_sv);
1732 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1735 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1736 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1738 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1739 PL_sig_ignoring[i] = 0;
1741 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1742 PL_sig_defaulting[i] = 0;
1744 to_dec = PL_psig_ptr[i];
1746 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1747 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1749 /* Signals don't change name during the program's execution, so once
1750 they're cached in the appropriate slot of PL_psig_name, they can
1753 Ideally we'd find some way of making SVs at (C) compile time, or
1754 at least, doing most of the work. */
1755 if (!PL_psig_name[i]) {
1756 PL_psig_name[i] = newSVpvn(s, len);
1757 SvREADONLY_on(PL_psig_name[i]);
1760 SvREFCNT_dec(PL_psig_name[i]);
1761 PL_psig_name[i] = NULL;
1762 PL_psig_ptr[i] = NULL;
1765 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1767 (void)rsignal(i, PL_csighandlerp);
1770 *svp = SvREFCNT_inc_simple_NN(sv);
1772 if (sv && SvOK(sv)) {
1773 s = SvPV_force(sv, len);
1777 if (sv && memEQs(s, len,"IGNORE")) {
1779 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1780 PL_sig_ignoring[i] = 1;
1781 (void)rsignal(i, PL_csighandlerp);
1783 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1787 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1789 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1790 PL_sig_defaulting[i] = 1;
1791 (void)rsignal(i, PL_csighandlerp);
1793 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1799 * We should warn if HINT_STRICT_REFS, but without
1800 * access to a known hint bit in a known OP, we can't
1801 * tell whether HINT_STRICT_REFS is in force or not.
1803 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
1804 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1807 (void)rsignal(i, PL_csighandlerp);
1809 *svp = SvREFCNT_inc_simple_NN(sv);
1813 #ifdef HAS_SIGPROCMASK
1817 SvREFCNT_dec(to_dec);
1820 #endif /* !PERL_MICRO */
1823 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1825 PERL_ARGS_ASSERT_MAGIC_SETISA;
1826 PERL_UNUSED_ARG(sv);
1828 /* Skip _isaelem because _isa will handle it shortly */
1829 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1832 return magic_clearisa(NULL, mg);
1835 /* sv of NULL signifies that we're acting as magic_setisa. */
1837 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1840 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1842 /* Bail out if destruction is going on */
1843 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1846 av_clear(MUTABLE_AV(sv));
1848 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1849 /* This occurs with setisa_elem magic, which calls this
1851 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1854 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1855 SV **svp = AvARRAY((AV *)mg->mg_obj);
1856 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1858 stash = GvSTASH((GV *)*svp++);
1859 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1866 (const GV *)mg->mg_obj
1869 /* The stash may have been detached from the symbol table, so check its
1870 name before doing anything. */
1871 if (stash && HvENAME_get(stash))
1872 mro_isa_changed_in(stash);
1878 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1880 HV * const hv = MUTABLE_HV(LvTARG(sv));
1883 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1884 PERL_UNUSED_ARG(mg);
1887 (void) hv_iterinit(hv);
1888 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1891 while (hv_iternext(hv))
1896 sv_setiv(sv, (IV)i);
1901 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1903 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1904 PERL_UNUSED_ARG(mg);
1906 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1912 =for apidoc magic_methcall
1914 Invoke a magic method (like FETCH).
1916 C<sv> and C<mg> are the tied thingy and the tie magic.
1918 C<meth> is the name of the method to call.
1920 C<argc> is the number of args (in addition to $self) to pass to the method.
1922 The C<flags> can be:
1924 G_DISCARD invoke method with G_DISCARD flag and don't
1926 G_UNDEF_FILL fill the stack with argc pointers to
1929 The arguments themselves are any values following the C<flags> argument.
1931 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1938 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1944 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1948 if (flags & G_WRITING_TO_STDERR) {
1952 SAVESPTR(PL_stderrgv);
1956 PUSHSTACKi(PERLSI_MAGIC);
1959 /* EXTEND() expects a signed argc; don't wrap when casting */
1960 assert(argc <= I32_MAX);
1961 EXTEND(SP, (I32)argc+1);
1962 PUSHs(SvTIED_obj(sv, mg));
1963 if (flags & G_UNDEF_FILL) {
1965 PUSHs(&PL_sv_undef);
1967 } else if (argc > 0) {
1969 va_start(args, argc);
1972 SV *const this_sv = va_arg(args, SV *);
1979 if (flags & G_DISCARD) {
1980 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1983 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1984 ret = *PL_stack_sp--;
1987 if (flags & G_WRITING_TO_STDERR)
1993 /* wrapper for magic_methcall that creates the first arg */
1996 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
2001 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
2004 if (mg->mg_len >= 0) {
2005 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
2007 else if (mg->mg_len == HEf_SVKEY)
2008 arg1 = MUTABLE_SV(mg->mg_ptr);
2010 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
2011 arg1 = newSViv((IV)(mg->mg_len));
2015 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
2017 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
2021 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
2025 PERL_ARGS_ASSERT_MAGIC_METHPACK;
2027 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
2034 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
2036 PERL_ARGS_ASSERT_MAGIC_GETPACK;
2038 if (mg->mg_type == PERL_MAGIC_tiedelem)
2039 mg->mg_flags |= MGf_GSKIP;
2040 magic_methpack(sv,mg,SV_CONST(FETCH));
2045 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
2050 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2052 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2053 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2054 * public flags indicate its value based on copying from $val. Doing
2055 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2056 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2057 * wrong if $val happened to be tainted, as sv hasn't got magic
2058 * enabled, even though taint magic is in the chain. In which case,
2059 * fake up a temporary tainted value (this is easier than temporarily
2060 * re-enabling magic on sv). */
2062 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
2063 && (tmg->mg_len & 1))
2065 val = sv_mortalcopy(sv);
2071 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
2076 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
2078 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2080 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
2081 return magic_methpack(sv,mg,SV_CONST(DELETE));
2086 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
2091 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2093 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
2095 retval = SvIV(retsv)-1;
2097 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
2099 return (U32) retval;
2103 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
2105 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2107 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
2112 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
2116 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2118 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2119 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
2126 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
2128 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2130 return magic_methpack(sv,mg,SV_CONST(EXISTS));
2134 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2137 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2138 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
2140 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2142 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2144 if (HvEITER_get(hv))
2145 /* we are in an iteration so the hash cannot be empty */
2147 /* no xhv_eiter so now use FIRSTKEY */
2148 key = sv_newmortal();
2149 magic_nextpack(MUTABLE_SV(hv), mg, key);
2150 HvEITER_set(hv, NULL); /* need to reset iterator */
2151 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2154 /* there is a SCALAR method that we can call */
2155 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2157 retval = &PL_sv_undef;
2162 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2166 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2168 /* The magic ptr/len for the debugger's hash should always be an SV. */
2169 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2170 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
2171 (IV)mg->mg_len, mg->mg_ptr);
2174 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2175 setting/clearing debugger breakpoints is not a hot path. */
2176 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2177 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2179 if (svp && SvIOKp(*svp)) {
2180 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2182 #ifdef PERL_DEBUG_READONLY_OPS
2183 Slab_to_rw(OpSLAB(o));
2185 /* set or clear breakpoint in the relevant control op */
2187 o->op_flags |= OPf_SPECIAL;
2189 o->op_flags &= ~OPf_SPECIAL;
2190 #ifdef PERL_DEBUG_READONLY_OPS
2191 Slab_to_ro(OpSLAB(o));
2199 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2201 AV * const obj = MUTABLE_AV(mg->mg_obj);
2203 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2206 sv_setiv(sv, AvFILL(obj));
2214 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2216 AV * const obj = MUTABLE_AV(mg->mg_obj);
2218 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2221 av_fill(obj, SvIV(sv));
2223 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2224 "Attempt to set length of freed array");
2230 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2232 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2233 PERL_UNUSED_ARG(sv);
2234 PERL_UNUSED_CONTEXT;
2236 /* Reset the iterator when the array is cleared */
2237 if (sizeof(IV) == sizeof(SSize_t)) {
2238 *((IV *) &(mg->mg_len)) = 0;
2241 *((IV *) mg->mg_ptr) = 0;
2248 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2250 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2251 PERL_UNUSED_ARG(sv);
2253 /* during global destruction, mg_obj may already have been freed */
2254 if (PL_in_clean_all)
2257 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2260 /* arylen scalar holds a pointer back to the array, but doesn't own a
2261 reference. Hence the we (the array) are about to go away with it
2262 still pointing at us. Clear its pointer, else it would be pointing
2263 at free memory. See the comment in sv_magic about reference loops,
2264 and why it can't own a reference to us. */
2271 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2273 SV* const lsv = LvTARG(sv);
2274 MAGIC * const found = mg_find_mglob(lsv);
2276 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2277 PERL_UNUSED_ARG(mg);
2279 if (found && found->mg_len != -1) {
2280 STRLEN i = found->mg_len;
2281 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2282 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2291 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2293 SV* const lsv = LvTARG(sv);
2299 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2300 PERL_UNUSED_ARG(mg);
2302 found = mg_find_mglob(lsv);
2306 found = sv_magicext_mglob(lsv);
2308 else if (!SvOK(sv)) {
2312 s = SvPV_const(lsv, len);
2317 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
2327 else if (pos > (SSize_t)len)
2330 found->mg_len = pos;
2331 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2337 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2340 SV * const lsv = LvTARG(sv);
2341 const char * const tmps = SvPV_const(lsv,len);
2342 STRLEN offs = LvTARGOFF(sv);
2343 STRLEN rem = LvTARGLEN(sv);
2344 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2345 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
2347 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2348 PERL_UNUSED_ARG(mg);
2350 if (!translate_substr_offsets(
2351 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2352 negoff ? -(IV)offs : (IV)offs, !negoff,
2353 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2355 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2361 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2362 sv_setpvn(sv, tmps + offs, rem);
2369 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2371 STRLEN len, lsv_len, oldtarglen, newtarglen;
2372 const char * const tmps = SvPV_const(sv, len);
2373 SV * const lsv = LvTARG(sv);
2374 STRLEN lvoff = LvTARGOFF(sv);
2375 STRLEN lvlen = LvTARGLEN(sv);
2376 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2377 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
2379 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2380 PERL_UNUSED_ARG(mg);
2384 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2385 "Attempt to use reference as lvalue in substr"
2387 SvPV_force_nomg(lsv,lsv_len);
2388 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2389 if (!translate_substr_offsets(
2391 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2392 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2394 Perl_croak(aTHX_ "substr outside of string");
2397 sv_utf8_upgrade_nomg(lsv);
2398 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2399 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2400 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2403 else if (SvUTF8(lsv)) {
2405 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2407 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2408 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2412 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2415 if (!neglen) LvTARGLEN(sv) = newtarglen;
2416 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2422 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2424 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2425 PERL_UNUSED_ARG(sv);
2426 #ifdef NO_TAINT_SUPPORT
2427 PERL_UNUSED_ARG(mg);
2430 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2435 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2437 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2438 PERL_UNUSED_ARG(sv);
2440 /* update taint status */
2449 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2451 SV * const lsv = LvTARG(sv);
2452 char errflags = LvFLAGS(sv);
2454 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2455 PERL_UNUSED_ARG(mg);
2457 /* non-zero errflags implies deferred out-of-range condition */
2458 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
2459 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2465 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2467 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2468 PERL_UNUSED_ARG(mg);
2469 do_vecset(sv); /* XXX slurp this routine */
2474 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2477 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2478 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2480 if (LvTARGLEN(sv)) {
2482 SV * const ahv = LvTARG(sv);
2483 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2487 else if (LvSTARGOFF(sv) >= 0) {
2488 AV *const av = MUTABLE_AV(LvTARG(sv));
2489 if (LvSTARGOFF(sv) <= AvFILL(av))
2491 if (SvRMAGICAL(av)) {
2492 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2493 targ = svp ? *svp : NULL;
2496 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2499 if (targ && (targ != &PL_sv_undef)) {
2500 /* somebody else defined it for us */
2501 SvREFCNT_dec(LvTARG(sv));
2502 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2504 SvREFCNT_dec(mg->mg_obj);
2506 mg->mg_flags &= ~MGf_REFCOUNTED;
2515 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2517 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2519 sv_setsv(sv, defelem_target(sv, mg));
2524 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2526 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2527 PERL_UNUSED_ARG(mg);
2531 sv_setsv(LvTARG(sv), sv);
2532 SvSETMAGIC(LvTARG(sv));
2538 Perl_vivify_defelem(pTHX_ SV *sv)
2543 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2545 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2548 SV * const ahv = LvTARG(sv);
2549 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2552 if (!value || value == &PL_sv_undef)
2553 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2555 else if (LvSTARGOFF(sv) < 0)
2556 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2558 AV *const av = MUTABLE_AV(LvTARG(sv));
2559 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2560 LvTARG(sv) = NULL; /* array can't be extended */
2562 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2563 if (!svp || !(value = *svp))
2564 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2567 SvREFCNT_inc_simple_void(value);
2568 SvREFCNT_dec(LvTARG(sv));
2571 SvREFCNT_dec(mg->mg_obj);
2573 mg->mg_flags &= ~MGf_REFCOUNTED;
2577 Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2579 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2580 PERL_UNUSED_ARG(mg);
2581 sv_unmagic(sv, PERL_MAGIC_nonelem);
2586 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2588 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2589 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2594 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2596 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2597 PERL_UNUSED_CONTEXT;
2598 PERL_UNUSED_ARG(sv);
2604 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2606 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2608 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2610 if (uf && uf->uf_set)
2611 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2616 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2618 const char type = mg->mg_type;
2620 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2622 assert( type == PERL_MAGIC_fm
2623 || type == PERL_MAGIC_qr
2624 || type == PERL_MAGIC_bm);
2625 return sv_unmagic(sv, type);
2628 #ifdef USE_LOCALE_COLLATE
2630 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2632 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2635 * RenE<eacute> Descartes said "I think not."
2636 * and vanished with a faint plop.
2638 PERL_UNUSED_CONTEXT;
2639 PERL_UNUSED_ARG(sv);
2641 Safefree(mg->mg_ptr);
2647 #endif /* USE_LOCALE_COLLATE */
2649 /* Just clear the UTF-8 cache data. */
2651 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2653 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2654 PERL_UNUSED_CONTEXT;
2655 PERL_UNUSED_ARG(sv);
2656 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2658 mg->mg_len = -1; /* The mg_len holds the len cache. */
2663 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2665 const char *bad = NULL;
2666 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2667 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2668 switch (mg->mg_private & OPpLVREF_TYPE) {
2670 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2674 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2678 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2682 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2686 /* diag_listed_as: Assigned value is not %s reference */
2687 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2688 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2691 SV * const old = PAD_SV(mg->mg_len);
2692 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2697 gv_setref(mg->mg_obj, sv);
2698 SvSETMAGIC(mg->mg_obj);
2701 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2702 SvREFCNT_inc_simple_NN(SvRV(sv)));
2705 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2706 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2708 if (mg->mg_flags & MGf_PERSIST)
2709 NOOP; /* This sv is in use as an iterator var and will be reused,
2710 so we must leave the magic. */
2712 /* This sv could be returned by the assignment op, so clear the
2713 magic, as lvrefs are an implementation detail that must not be
2714 leaked to the user. */
2715 sv_unmagic(sv, PERL_MAGIC_lvref);
2720 S_set_dollarzero(pTHX_ SV *sv)
2721 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2728 #ifdef HAS_SETPROCTITLE
2729 /* The BSDs don't show the argv[] in ps(1) output, they
2730 * show a string from the process struct and provide
2731 * the setproctitle() routine to manipulate that. */
2732 if (PL_origalen != 1) {
2733 s = SvPV_const(sv, len);
2734 # if __FreeBSD_version > 410001 || defined(__DragonFly__)
2735 /* The leading "-" removes the "perl: " prefix,
2736 * but not the "(perl) suffix from the ps(1)
2737 * output, because that's what ps(1) shows if the
2738 * argv[] is modified. */
2739 setproctitle("-%s", s);
2740 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2741 /* This doesn't really work if you assume that
2742 * $0 = 'foobar'; will wipe out 'perl' from the $0
2743 * because in ps(1) output the result will be like
2744 * sprintf("perl: %s (perl)", s)
2745 * I guess this is a security feature:
2746 * one (a user process) cannot get rid of the original name.
2748 setproctitle("%s", s);
2751 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2752 if (PL_origalen != 1) {
2754 s = SvPV_const(sv, len);
2755 un.pst_command = (char *)s;
2756 pstat(PSTAT_SETCMD, un, len, 0, 0);
2759 if (PL_origalen > 1) {
2761 /* PL_origalen is set in perl_parse(). */
2762 s = SvPV_force(sv,len);
2763 if (len >= (STRLEN)PL_origalen-1) {
2764 /* Longer than original, will be truncated. We assume that
2765 * PL_origalen bytes are available. */
2766 Copy(s, PL_origargv[0], PL_origalen-1, char);
2769 /* Shorter than original, will be padded. */
2771 /* Special case for Mac OS X: see [perl #38868] */
2774 /* Is the space counterintuitive? Yes.
2775 * (You were expecting \0?)
2776 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2778 const int pad = ' ';
2780 Copy(s, PL_origargv[0], len, char);
2781 PL_origargv[0][len] = 0;
2782 memset(PL_origargv[0] + len + 1,
2783 pad, PL_origalen - len - 1);
2785 PL_origargv[0][PL_origalen-1] = 0;
2786 for (i = 1; i < PL_origargc; i++)
2788 #ifdef HAS_PRCTL_SET_NAME
2789 /* Set the legacy process name in addition to the POSIX name on Linux */
2790 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2791 /* diag_listed_as: SKIPME */
2792 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2800 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2811 PERL_ARGS_ASSERT_MAGIC_SET;
2815 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2817 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2819 /* Croak with a READONLY error when a numbered match var is
2820 * set without a previous pattern match. Unless it's C<local $1>
2823 if (!PL_localizing) {
2824 Perl_croak_no_modify();
2830 switch (*mg->mg_ptr) {
2831 case '\001': /* ^A */
2832 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2833 else SvOK_off(PL_bodytarget);
2834 FmLINES(PL_bodytarget) = 0;
2835 if (SvPOK(PL_bodytarget)) {
2836 char *s = SvPVX(PL_bodytarget);
2837 char *e = SvEND(PL_bodytarget);
2838 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
2839 FmLINES(PL_bodytarget)++;
2843 /* mg_set() has temporarily made sv non-magical */
2845 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2846 SvTAINTED_on(PL_bodytarget);
2848 SvTAINTED_off(PL_bodytarget);
2851 case '\003': /* ^C */
2852 PL_minus_c = cBOOL(SvIV(sv));
2855 case '\004': /* ^D */
2858 const char *s = SvPV_nolen_const(sv);
2859 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2860 if (DEBUG_x_TEST || DEBUG_B_TEST)
2861 dump_all_perl(!DEBUG_B_TEST);
2864 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2867 case '\005': /* ^E */
2868 if (*(mg->mg_ptr+1) == '\0') {
2870 set_vaxc_errno(SvIV(sv));
2871 #elif defined(WIN32)
2872 SetLastError( SvIV(sv) );
2874 os2_setsyserrno(SvIV(sv));
2876 /* will anyone ever use this? */
2877 SETERRNO(SvIV(sv), 4);
2880 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2881 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
2883 case '\006': /* ^F */
2884 if (mg->mg_ptr[1] == '\0') {
2885 PL_maxsysfd = SvIV(sv);
2888 case '\010': /* ^H */
2890 U32 save_hints = PL_hints;
2891 PL_hints = SvUV(sv);
2893 /* If wasn't UTF-8, and now is, notify the parser */
2894 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2895 notify_parser_that_changed_to_utf8();
2899 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2900 Safefree(PL_inplace);
2901 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2903 case '\016': /* ^N */
2904 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2905 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2907 case '\017': /* ^O */
2908 if (*(mg->mg_ptr+1) == '\0') {
2909 Safefree(PL_osname);
2912 TAINT_PROPER("assigning to $^O");
2913 PL_osname = savesvpv(sv);
2916 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2918 const char *const start = SvPV(sv, len);
2919 const char *out = (const char*)memchr(start, '\0', len);
2923 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2924 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2926 /* Opening for input is more common than opening for output, so
2927 ensure that hints for input are sooner on linked list. */
2928 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2930 : newSVpvs_flags("", SvUTF8(sv));
2931 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2934 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2936 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2940 case '\020': /* ^P */
2941 PL_perldb = SvIV(sv);
2942 if (PL_perldb && !PL_DBsingle)
2945 case '\024': /* ^T */
2947 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2949 PL_basetime = (Time_t)SvIV(sv);
2952 case '\025': /* ^UTF8CACHE */
2953 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2954 PL_utf8cache = (signed char) sv_2iv(sv);
2957 case '\027': /* ^W & $^WARNING_BITS */
2958 if (*(mg->mg_ptr+1) == '\0') {
2959 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2961 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2962 | (i ? G_WARN_ON : G_WARN_OFF) ;
2965 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2966 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2968 if (!specialWARN(PL_compiling.cop_warnings))
2969 PerlMemShared_free(PL_compiling.cop_warnings);
2970 PL_compiling.cop_warnings = pWARN_STD;
2975 int not_none = 0, not_all = 0;
2976 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
2977 for (i = 0 ; i < len ; ++i) {
2979 not_all |= ptr[i] ^ 0x55;
2982 if (!specialWARN(PL_compiling.cop_warnings))
2983 PerlMemShared_free(PL_compiling.cop_warnings);
2984 PL_compiling.cop_warnings = pWARN_NONE;
2985 } else if (len >= WARNsize && !not_all) {
2986 if (!specialWARN(PL_compiling.cop_warnings))
2987 PerlMemShared_free(PL_compiling.cop_warnings);
2988 PL_compiling.cop_warnings = pWARN_ALL;
2989 PL_dowarn |= G_WARN_ONCE ;
2993 const char *const p = SvPV_const(sv, len);
2995 PL_compiling.cop_warnings
2996 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2999 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
3000 PL_dowarn |= G_WARN_ONCE ;
3007 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
3008 w32_sloppystat = (bool)sv_true(sv);
3013 if (PL_localizing) {
3014 if (PL_localizing == 1)
3015 SAVESPTR(PL_last_in_gv);
3017 else if (SvOK(sv) && GvIO(PL_last_in_gv))
3018 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
3021 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
3022 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
3023 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
3026 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
3027 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
3028 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
3031 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
3034 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3035 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
3036 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
3039 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
3043 IO * const io = GvIO(PL_defoutgv);
3046 if ((SvIV(sv)) == 0)
3047 IoFLAGS(io) &= ~IOf_FLUSH;
3049 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3050 PerlIO *ofp = IoOFP(io);
3052 (void)PerlIO_flush(ofp);
3053 IoFLAGS(io) |= IOf_FLUSH;
3061 SV *referent = SvRV(sv);
3062 const char *reftype = sv_reftype(referent, 0);
3063 /* XXX: dodgy type check: This leaves me feeling dirty, but
3064 * the alternative is to copy pretty much the entire
3065 * sv_reftype() into this routine, or to do a full string
3066 * comparison on the return of sv_reftype() both of which
3067 * make me feel worse! NOTE, do not modify this comment
3068 * without reviewing the corresponding comment in
3069 * sv_reftype(). - Yves */
3070 if (reftype[0] == 'S' || reftype[0] == 'L') {
3071 IV val = SvIV(referent);
3073 sv_setsv(sv, PL_rs);
3074 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3075 val < 0 ? "a negative integer" : "zero");
3078 sv_setsv(sv, PL_rs);
3079 /* diag_listed_as: Setting $/ to %s reference is forbidden */
3080 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3081 *reftype == 'A' ? "n" : "", reftype);
3084 SvREFCNT_dec(PL_rs);
3085 PL_rs = newSVsv(sv);
3089 SvREFCNT_dec(PL_ors_sv);
3091 PL_ors_sv = newSVsv(sv);
3099 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3102 #ifdef COMPLEX_STATUS
3103 if (PL_localizing == 2) {
3104 SvUPGRADE(sv, SVt_PVLV);
3105 PL_statusvalue = LvTARGOFF(sv);
3106 PL_statusvalue_vms = LvTARGLEN(sv);
3110 #ifdef VMSISH_STATUS
3112 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
3115 STATUS_UNIX_EXIT_SET(SvIV(sv));
3120 # define PERL_VMS_BANG vaxc$errno
3122 # define PERL_VMS_BANG 0
3125 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3126 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3128 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
3129 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3135 /* XXX $< currently silently ignores failures */
3136 const Uid_t new_uid = SvUID(sv);
3137 PL_delaymagic_uid = new_uid;
3138 if (PL_delaymagic) {
3139 PL_delaymagic |= DM_RUID;
3140 break; /* don't do magic till later */
3143 PERL_UNUSED_RESULT(setruid(new_uid));
3144 #elif defined(HAS_SETREUID)
3145 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
3146 #elif defined(HAS_SETRESUID)
3147 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
3149 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
3151 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
3152 if (new_uid != 0 && PerlProc_getuid() == 0)
3153 PERL_UNUSED_RESULT(PerlProc_setuid(0));
3155 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
3157 Perl_croak(aTHX_ "setruid() not implemented");
3164 /* XXX $> currently silently ignores failures */
3165 const Uid_t new_euid = SvUID(sv);
3166 PL_delaymagic_euid = new_euid;
3167 if (PL_delaymagic) {
3168 PL_delaymagic |= DM_EUID;
3169 break; /* don't do magic till later */
3172 PERL_UNUSED_RESULT(seteuid(new_euid));
3173 #elif defined(HAS_SETREUID)
3174 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
3175 #elif defined(HAS_SETRESUID)
3176 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
3178 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
3179 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3181 Perl_croak(aTHX_ "seteuid() not implemented");
3188 /* XXX $( currently silently ignores failures */
3189 const Gid_t new_gid = SvGID(sv);
3190 PL_delaymagic_gid = new_gid;
3191 if (PL_delaymagic) {
3192 PL_delaymagic |= DM_RGID;
3193 break; /* don't do magic till later */
3196 PERL_UNUSED_RESULT(setrgid(new_gid));
3197 #elif defined(HAS_SETREGID)
3198 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3199 #elif defined(HAS_SETRESGID)
3200 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3202 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3203 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3205 Perl_croak(aTHX_ "setrgid() not implemented");
3212 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3213 * but you can override it if you need to.
3216 #define INVALID_GID ((Gid_t)-1)
3218 /* XXX $) currently silently ignores failures */
3220 #ifdef HAS_SETGROUPS
3222 const char *p = SvPV_const(sv, len);
3223 Groups_t *gary = NULL;
3224 const char* p_end = p + len;
3225 const char* endptr = p_end;
3227 #ifdef _SC_NGROUPS_MAX
3228 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3233 int maxgrp = NGROUPS;
3238 if (grok_atoUV(p, &uv, &endptr))
3239 new_egid = (Gid_t)uv;
3241 new_egid = INVALID_GID;
3244 for (i = 0; i < maxgrp; ++i) {
3254 Newx(gary, i + 1, Groups_t);
3256 Renew(gary, i + 1, Groups_t);
3257 if (grok_atoUV(p, &uv, &endptr))
3258 gary[i] = (Groups_t)uv;
3260 gary[i] = INVALID_GID;
3265 PERL_UNUSED_RESULT(setgroups(i, gary));
3268 #else /* HAS_SETGROUPS */
3269 new_egid = SvGID(sv);
3270 #endif /* HAS_SETGROUPS */
3271 PL_delaymagic_egid = new_egid;
3272 if (PL_delaymagic) {
3273 PL_delaymagic |= DM_EGID;
3274 break; /* don't do magic till later */
3277 PERL_UNUSED_RESULT(setegid(new_egid));
3278 #elif defined(HAS_SETREGID)
3279 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3280 #elif defined(HAS_SETRESGID)
3281 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3283 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3284 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3286 Perl_croak(aTHX_ "setegid() not implemented");
3292 PL_chopset = SvPV_force(sv,len);
3295 /* Store the pid in mg->mg_obj so we can tell when a fork has
3296 occurred. mg->mg_obj points to *$ by default, so clear it. */
3297 if (isGV(mg->mg_obj)) {
3298 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3299 SvREFCNT_dec(mg->mg_obj);
3300 mg->mg_flags |= MGf_REFCOUNTED;
3301 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3303 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3306 LOCK_DOLLARZERO_MUTEX;
3307 S_set_dollarzero(aTHX_ sv);
3308 UNLOCK_DOLLARZERO_MUTEX;
3315 Perl_whichsig_sv(pTHX_ SV *sigsv)
3319 PERL_ARGS_ASSERT_WHICHSIG_SV;
3320 sigpv = SvPV_const(sigsv, siglen);
3321 return whichsig_pvn(sigpv, siglen);
3325 Perl_whichsig_pv(pTHX_ const char *sig)
3327 PERL_ARGS_ASSERT_WHICHSIG_PV;
3328 return whichsig_pvn(sig, strlen(sig));
3332 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3336 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3337 PERL_UNUSED_CONTEXT;
3339 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3340 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3341 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3343 if (memEQs(sig, len, "CHLD"))
3347 if (memEQs(sig, len, "CLD"))
3354 /* Perl_sighandler(), Perl_sighandler1(), Perl_sighandler3():
3355 * these three function are intended to be called by the OS as 'C' level
3356 * signal handler functions in the case where unsafe signals are being
3357 * used - i.e. they immediately invoke Perl_perly_sighandler() to call the
3358 * perl-level sighandler, rather than deferring.
3359 * In fact, the core itself will normally use Perl_csighandler as the
3360 * OS-level handler; that function will then decide whether to queue the
3361 * signal or call Perl_sighandler / Perl_perly_sighandler itself. So these
3362 * functions are more useful for e.g. POSIX.xs when it wants explicit
3363 * control of what's happening.
3367 #ifdef PERL_USE_3ARG_SIGHANDLER
3370 Perl_sighandler(int sig, Siginfo_t *sip, void *uap)
3372 Perl_perly_sighandler(sig, sip, uap, 0);
3378 Perl_sighandler(int sig)
3380 Perl_perly_sighandler(sig, NULL, NULL, 0);
3386 Perl_sighandler1(int sig)
3388 Perl_perly_sighandler(sig, NULL, NULL, 0);
3392 Perl_sighandler3(int sig, Siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
3394 Perl_perly_sighandler(sig, sip, uap, 0);
3398 /* Invoke the perl-level signal handler. This function is called either
3399 * directly from one of the C-level signals handlers (Perl_sighandler or
3400 * Perl_csighandler), or for safe signals, later from
3401 * Perl_despatch_signals() at a suitable safe point during execution.
3403 * 'safe' is a boolean indicating the latter call path.
3407 Perl_perly_sighandler(int sig, Siginfo_t *sip PERL_UNUSED_DECL,
3408 void *uap PERL_UNUSED_DECL, bool safe)
3410 #ifdef PERL_GET_SIG_CONTEXT
3411 dTHXa(PERL_GET_SIG_CONTEXT);
3418 SV * const tSv = PL_Sv;
3422 XPV * const tXpv = PL_Xpv;
3423 I32 old_ss_ix = PL_savestack_ix;
3424 SV *errsv_save = NULL;
3427 if (!PL_psig_ptr[sig]) {
3428 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3433 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3434 /* Max number of items pushed there is 3*n or 4. We cannot fix
3435 infinity, so we fix 4 (in fact 5): */
3436 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3438 PL_savestack_ix += 5; /* Protect save in progress. */
3439 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3442 /* sv_2cv is too complicated, try a simpler variant first: */
3443 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3444 || SvTYPE(cv) != SVt_PVCV) {
3446 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3449 if (!cv || !CvROOT(cv)) {
3450 const HEK * const hek = gv
3454 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3456 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3457 "SIG%s handler \"%" HEKf "\" not defined.\n",
3458 PL_sig_name[sig], HEKfARG(hek));
3459 /* diag_listed_as: SIG%s handler "%s" not defined */
3460 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3461 "SIG%s handler \"__ANON__\" not defined.\n",
3466 sv = PL_psig_name[sig]
3467 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3468 : newSVpv(PL_sig_name[sig],0);
3472 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3473 /* make sure our assumption about the size of the SAVEs are correct:
3474 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3475 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3478 PUSHSTACKi(PERLSI_SIGNAL);
3482 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3484 struct sigaction oact;
3486 if (sip && sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3488 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3489 /* The siginfo fields signo, code, errno, pid, uid,
3490 * addr, status, and band are defined by POSIX/SUSv3. */
3491 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3492 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3493 # ifdef HAS_SIGINFO_SI_ERRNO
3494 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3496 # ifdef HAS_SIGINFO_SI_STATUS
3497 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3499 # ifdef HAS_SIGINFO_SI_UID
3502 sv_setuid(uid, sip->si_uid);
3503 (void)hv_stores(sih, "uid", uid);
3506 # ifdef HAS_SIGINFO_SI_PID
3507 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3509 # ifdef HAS_SIGINFO_SI_ADDR
3510 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3512 # ifdef HAS_SIGINFO_SI_BAND
3513 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3517 mPUSHp((char *)sip, sizeof(*sip));
3525 errsv_save = newSVsv(ERRSV);
3527 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3531 SV * const errsv = ERRSV;
3532 if (SvTRUE_NN(errsv)) {
3533 SvREFCNT_dec(errsv_save);
3536 /* Handler "died", for example to get out of a restart-able read().
3537 * Before we re-do that on its behalf re-enable the signal which was
3538 * blocked by the system when we entered.
3540 # ifdef HAS_SIGPROCMASK
3542 /* safe signals called via dispatch_signals() set up a
3543 * savestack destructor, unblock_sigmask(), to
3544 * automatically unblock the handler at the end. If
3545 * instead we get here directly, we have to do it
3550 sigaddset(&set,sig);
3551 sigprocmask(SIG_UNBLOCK, &set, NULL);
3554 /* Not clear if this will work */
3555 /* XXX not clear if this should be protected by 'if (safe)'
3558 (void)rsignal(sig, SIG_IGN);
3559 (void)rsignal(sig, PL_csighandlerp);
3561 #endif /* !PERL_MICRO */
3566 sv_setsv(errsv, errsv_save);
3567 SvREFCNT_dec(errsv_save);
3572 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3573 PL_savestack_ix = old_ss_ix;
3575 SvREFCNT_dec_NN(sv);
3576 PL_op = myop; /* Apparently not needed... */
3578 PL_Sv = tSv; /* Restore global temporaries. */
3585 S_restore_magic(pTHX_ const void *p)
3587 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3588 SV* const sv = mgs->mgs_sv;
3594 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3595 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3597 SvFLAGS(sv) |= mgs->mgs_flags;
3602 bumped = mgs->mgs_bumped;
3603 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3605 /* If we're still on top of the stack, pop us off. (That condition
3606 * will be satisfied if restore_magic was called explicitly, but *not*
3607 * if it's being called via leave_scope.)
3608 * The reason for doing this is that otherwise, things like sv_2cv()
3609 * may leave alloc gunk on the savestack, and some code
3610 * (e.g. sighandler) doesn't expect that...
3612 if (PL_savestack_ix == mgs->mgs_ss_ix)
3614 UV popval = SSPOPUV;
3615 assert(popval == SAVEt_DESTRUCTOR_X);
3616 PL_savestack_ix -= 2;
3618 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3619 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3622 if (SvREFCNT(sv) == 1) {
3623 /* We hold the last reference to this SV, which implies that the
3624 SV was deleted as a side effect of the routines we called.
3625 So artificially keep it alive a bit longer.
3626 We avoid turning on the TEMP flag, which can cause the SV's
3627 buffer to get stolen (and maybe other stuff). */
3632 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3636 /* clean up the mess created by Perl_sighandler().
3637 * Note that this is only called during an exit in a signal handler;
3638 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3642 S_unwind_handler_stack(pTHX_ const void *p)
3646 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3650 =for apidoc magic_sethint
3652 Triggered by a store to C<%^H>, records the key/value pair to
3653 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3654 anything that would need a deep copy. Maybe we should warn if we find a
3660 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3662 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3663 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3665 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3667 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3668 an alternative leaf in there, with PL_compiling.cop_hints being used if
3669 it's NULL. If needed for threads, the alternative could lock a mutex,
3670 or take other more complex action. */
3672 /* Something changed in %^H, so it will need to be restored on scope exit.
3673 Doing this here saves a lot of doing it manually in perl code (and
3674 forgetting to do it, and consequent subtle errors. */
3675 PL_hints |= HINT_LOCALIZE_HH;
3676 CopHINTHASH_set(&PL_compiling,
3677 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3678 magic_sethint_feature(key, NULL, 0, sv, 0);
3683 =for apidoc magic_clearhint
3685 Triggered by a delete from C<%^H>, records the key to
3686 C<PL_compiling.cop_hints_hash>.
3691 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3693 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3694 PERL_UNUSED_ARG(sv);
3696 PL_hints |= HINT_LOCALIZE_HH;
3697 CopHINTHASH_set(&PL_compiling,
3698 mg->mg_len == HEf_SVKEY
3699 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3700 MUTABLE_SV(mg->mg_ptr), 0, 0)
3701 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3702 mg->mg_ptr, mg->mg_len, 0, 0));
3703 if (mg->mg_len == HEf_SVKEY)
3704 magic_sethint_feature(MUTABLE_SV(mg->mg_ptr), NULL, 0, NULL, FALSE);
3706 magic_sethint_feature(NULL, mg->mg_ptr, mg->mg_len, NULL, FALSE);
3711 =for apidoc magic_clearhints
3713 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3718 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3720 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3721 PERL_UNUSED_ARG(sv);
3722 PERL_UNUSED_ARG(mg);
3723 cophh_free(CopHINTHASH_get(&PL_compiling));
3724 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3730 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3731 const char *name, I32 namlen)
3735 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3736 PERL_UNUSED_ARG(sv);
3737 PERL_UNUSED_ARG(name);
3738 PERL_UNUSED_ARG(namlen);
3740 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3741 nmg = mg_find(nsv, mg->mg_type);
3743 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3744 nmg->mg_ptr = mg->mg_ptr;
3745 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3746 nmg->mg_flags |= MGf_REFCOUNTED;
3751 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3752 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3754 #if DBVARMG_SINGLE != 0
3755 assert(mg->mg_private >= DBVARMG_SINGLE);
3757 assert(mg->mg_private < DBVARMG_COUNT);
3759 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3765 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3766 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3768 #if DBVARMG_SINGLE != 0
3769 assert(mg->mg_private >= DBVARMG_SINGLE);
3771 assert(mg->mg_private < DBVARMG_COUNT);
3772 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3778 * ex: set ts=8 sts=4 sw=4 et: