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"]
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
37 =for apidoc Ayh||MAGIC
48 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
54 #if defined(HAS_SETGROUPS)
61 # include <sys/pstat.h>
64 #ifdef HAS_PRCTL_SET_NAME
65 # include <sys/prctl.h>
69 /* Missing protos on LynxOS */
70 void setruid(uid_t id);
71 void seteuid(uid_t id);
72 void setrgid(uid_t id);
73 void setegid(uid_t id);
77 * Pre-magic setup and post-magic takedown.
78 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
87 /* MGS is typedef'ed to struct magic_state in perl.h */
90 S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
95 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
97 assert(SvMAGICAL(sv));
99 /* we shouldn't really be called here with RC==0, but it can sometimes
100 * happen via mg_clear() (which also shouldn't be called when RC==0,
101 * but it can happen). Handle this case gracefully(ish) by not RC++
102 * and thus avoiding the resultant double free */
103 if (SvREFCNT(sv) > 0) {
104 /* guard against sv getting freed midway through the mg clearing,
105 * by holding a private reference for the duration. */
106 SvREFCNT_inc_simple_void_NN(sv);
110 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
112 mgs = SSPTR(mgs_ix, MGS*);
114 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
115 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
116 mgs->mgs_bumped = bumped;
118 SvFLAGS(sv) &= ~flags;
122 #define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
125 =for apidoc mg_magical
127 Turns on the magical status of an SV. See C<L</sv_magic>>.
133 Perl_mg_magical(SV *sv)
136 PERL_ARGS_ASSERT_MG_MAGICAL;
139 if ((mg = SvMAGIC(sv))) {
141 const MGVTBL* const vtbl = mg->mg_virtual;
143 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
150 } while ((mg = mg->mg_moremagic));
151 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
159 Do magic before a value is retrieved from the SV. The type of SV must
160 be >= C<SVt_PVMG>. See C<L</sv_magic>>.
166 Perl_mg_get(pTHX_ SV *sv)
168 const I32 mgs_ix = SSNEW(sizeof(MGS));
171 bool taint_only = TRUE; /* the only get method seen is taint */
172 MAGIC *newmg, *head, *cur, *mg;
174 PERL_ARGS_ASSERT_MG_GET;
176 if (PL_localizing == 1 && sv == DEFSV) return 0;
178 /* We must call svt_get(sv, mg) for each valid entry in the linked
179 list of magic. svt_get() may delete the current entry, add new
180 magic to the head of the list, or upgrade the SV. AMS 20010810 */
182 newmg = cur = head = mg = SvMAGIC(sv);
184 const MGVTBL * const vtbl = mg->mg_virtual;
185 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
187 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
189 /* taint's mg get is so dumb it doesn't need flag saving */
190 if (mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
198 vtbl->svt_get(aTHX_ sv, mg);
200 /* guard against magic having been deleted - eg FETCH calling
203 /* recalculate flags */
204 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
208 /* recalculate flags if this entry was deleted. */
209 if (mg->mg_flags & MGf_GSKIP)
210 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
211 ~(SVs_GMG|SVs_SMG|SVs_RMG);
213 else if (vtbl == &PL_vtbl_utf8) {
214 /* get-magic can reallocate the PV, unless there's only taint
218 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
219 if ( mg2->mg_type != PERL_MAGIC_taint
220 && !(mg2->mg_flags & MGf_GSKIP)
222 && mg2->mg_virtual->svt_get
230 magic_setutf8(sv, mg);
236 /* Have we finished with the new entries we saw? Start again
237 where we left off (unless there are more new entries). */
245 /* Were any new entries added? */
246 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
250 /* recalculate flags */
251 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
256 restore_magic(INT2PTR(void *, (IV)mgs_ix));
264 Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
270 Perl_mg_set(pTHX_ SV *sv)
272 const I32 mgs_ix = SSNEW(sizeof(MGS));
276 PERL_ARGS_ASSERT_MG_SET;
278 if (PL_localizing == 2 && sv == DEFSV) return 0;
280 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
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_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
289 if (PL_localizing == 2
290 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
292 if (vtbl && vtbl->svt_set)
293 vtbl->svt_set(aTHX_ sv, mg);
296 restore_magic(INT2PTR(void*, (IV)mgs_ix));
301 =for apidoc mg_length
303 Reports on the SV's length in bytes, calling length magic if available,
304 but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
305 magic if there is no 'length' magic, but with no indication as to
306 whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
307 higher. Use C<sv_len()> instead.
313 Perl_mg_length(pTHX_ SV *sv)
318 PERL_ARGS_ASSERT_MG_LENGTH;
320 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
321 const MGVTBL * const vtbl = mg->mg_virtual;
322 if (vtbl && vtbl->svt_len) {
323 const I32 mgs_ix = SSNEW(sizeof(MGS));
324 save_magic(mgs_ix, sv);
325 /* omit MGf_GSKIP -- not changed here */
326 len = vtbl->svt_len(aTHX_ sv, mg);
327 restore_magic(INT2PTR(void*, (IV)mgs_ix));
332 (void)SvPV_const(sv, len);
337 Perl_mg_size(pTHX_ SV *sv)
341 PERL_ARGS_ASSERT_MG_SIZE;
343 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
344 const MGVTBL* const vtbl = mg->mg_virtual;
345 if (vtbl && vtbl->svt_len) {
346 const I32 mgs_ix = SSNEW(sizeof(MGS));
348 save_magic(mgs_ix, sv);
349 /* omit MGf_GSKIP -- not changed here */
350 len = vtbl->svt_len(aTHX_ sv, mg);
351 restore_magic(INT2PTR(void*, (IV)mgs_ix));
358 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
362 Perl_croak(aTHX_ "Size magic not implemented");
365 NOT_REACHED; /* NOTREACHED */
371 Clear something magical that the SV represents. See C<L</sv_magic>>.
377 Perl_mg_clear(pTHX_ SV *sv)
379 const I32 mgs_ix = SSNEW(sizeof(MGS));
383 PERL_ARGS_ASSERT_MG_CLEAR;
385 save_magic(mgs_ix, sv);
387 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
388 const MGVTBL* const vtbl = mg->mg_virtual;
389 /* omit GSKIP -- never set here */
391 nextmg = mg->mg_moremagic; /* it may delete itself */
393 if (vtbl && vtbl->svt_clear)
394 vtbl->svt_clear(aTHX_ sv, mg);
397 restore_magic(INT2PTR(void*, (IV)mgs_ix));
402 S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
409 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
410 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
422 Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
428 Perl_mg_find(const SV *sv, int type)
430 return S_mg_findext_flags(sv, type, NULL, 0);
434 =for apidoc mg_findext
436 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
443 Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
445 return S_mg_findext_flags(sv, type, vtbl, 1);
449 Perl_mg_find_mglob(pTHX_ SV *sv)
451 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
452 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
453 /* This sv is only a delegate. //g magic must be attached to
458 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
459 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
466 Copies the magic from one SV to another. See C<L</sv_magic>>.
472 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
477 PERL_ARGS_ASSERT_MG_COPY;
479 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
480 const MGVTBL* const vtbl = mg->mg_virtual;
481 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
482 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
485 const char type = mg->mg_type;
486 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
488 (type == PERL_MAGIC_tied)
491 toLOWER(type), key, klen);
500 =for apidoc mg_localize
502 Copy some of the magic from an existing SV to new localized version of that
503 SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
504 gets copied, value magic doesn't (I<e.g.>,
507 If C<setmagic> is false then no set magic will be called on the new (empty) SV.
508 This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
509 and that will handle the magic.
515 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
519 PERL_ARGS_ASSERT_MG_LOCALIZE;
524 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
525 const MGVTBL* const vtbl = mg->mg_virtual;
526 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
529 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
530 (void)vtbl->svt_local(aTHX_ nsv, mg);
532 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
533 mg->mg_ptr, mg->mg_len);
535 /* container types should remain read-only across localization */
536 SvFLAGS(nsv) |= SvREADONLY(sv);
539 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
540 SvFLAGS(nsv) |= SvMAGICAL(sv);
549 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
551 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
553 const MGVTBL* const vtbl = mg->mg_virtual;
554 if (vtbl && vtbl->svt_free)
555 vtbl->svt_free(aTHX_ sv, mg);
557 if (mg->mg_type == PERL_MAGIC_collxfrm && mg->mg_len >= 0)
558 /* collate magic uses string len not buffer len, so
559 * free even with mg_len == 0 */
560 Safefree(mg->mg_ptr);
561 else if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
562 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
563 Safefree(mg->mg_ptr);
564 else if (mg->mg_len == HEf_SVKEY)
565 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
568 if (mg->mg_flags & MGf_REFCOUNTED)
569 SvREFCNT_dec(mg->mg_obj);
576 Free any magic storage used by the SV. See C<L</sv_magic>>.
582 Perl_mg_free(pTHX_ SV *sv)
587 PERL_ARGS_ASSERT_MG_FREE;
589 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
590 moremagic = mg->mg_moremagic;
591 mg_free_struct(sv, mg);
592 SvMAGIC_set(sv, moremagic);
594 SvMAGIC_set(sv, NULL);
600 =for apidoc mg_free_type
602 Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
608 Perl_mg_free_type(pTHX_ SV *sv, int how)
610 MAGIC *mg, *prevmg, *moremg;
611 PERL_ARGS_ASSERT_MG_FREE_TYPE;
612 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
613 moremg = mg->mg_moremagic;
614 if (mg->mg_type == how) {
616 /* temporarily move to the head of the magic chain, in case
617 custom free code relies on this historical aspect of mg_free */
619 prevmg->mg_moremagic = moremg;
620 mg->mg_moremagic = SvMAGIC(sv);
623 newhead = mg->mg_moremagic;
624 mg_free_struct(sv, mg);
625 SvMAGIC_set(sv, newhead);
633 =for apidoc mg_freeext
635 Remove any magic of type C<how> using virtual table C<vtbl> from the
636 SV C<sv>. See L</sv_magic>.
638 C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
644 Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
646 MAGIC *mg, *prevmg, *moremg;
647 PERL_ARGS_ASSERT_MG_FREEEXT;
648 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
650 moremg = mg->mg_moremagic;
651 if (mg->mg_type == how && (vtbl == NULL || mg->mg_virtual == vtbl)) {
652 /* temporarily move to the head of the magic chain, in case
653 custom free code relies on this historical aspect of mg_free */
655 prevmg->mg_moremagic = moremg;
656 mg->mg_moremagic = SvMAGIC(sv);
659 newhead = mg->mg_moremagic;
660 mg_free_struct(sv, mg);
661 SvMAGIC_set(sv, newhead);
671 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
675 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
678 REGEXP * const rx = PM_GETRE(PL_curpm);
680 const SSize_t n = (SSize_t)mg->mg_obj;
681 if (n == '+') { /* @+ */
682 /* return the number possible */
683 return RX_NPARENS(rx);
684 } else { /* @- @^CAPTURE @{^CAPTURE} */
685 I32 paren = RX_LASTPAREN(rx);
687 /* return the last filled */
689 && (RX_OFFS(rx)[paren].start == -1
690 || RX_OFFS(rx)[paren].end == -1) )
696 /* @^CAPTURE @{^CAPTURE} */
697 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
709 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
711 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
714 REGEXP * const rx = PM_GETRE(PL_curpm);
716 const SSize_t n = (SSize_t)mg->mg_obj;
717 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
718 const I32 paren = mg->mg_len
719 + (n == '\003' ? 1 : 0);
724 if (paren <= (I32)RX_NPARENS(rx) &&
725 (s = RX_OFFS(rx)[paren].start) != -1 &&
726 (t = RX_OFFS(rx)[paren].end) != -1)
730 if (n == '+') /* @+ */
732 else if (n == '-') /* @- */
734 else { /* @^CAPTURE @{^CAPTURE} */
735 CALLREG_NUMBUF_FETCH(rx,paren,sv);
739 if (RX_MATCH_UTF8(rx)) {
740 const char * const b = RX_SUBBEG(rx);
742 i = RX_SUBCOFFSET(rx) +
744 (U8*)(b-RX_SUBOFFSET(rx)+i));
759 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
761 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
765 Perl_croak_no_modify();
766 NORETURN_FUNCTION_END;
769 #define SvRTRIM(sv) STMT_START { \
771 STRLEN len = SvCUR(sv); \
772 char * const p = SvPVX(sv); \
773 while (len > 0 && isSPACE(p[len-1])) \
775 SvCUR_set(sv, len); \
781 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
783 PERL_ARGS_ASSERT_EMULATE_COP_IO;
785 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
790 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
791 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
796 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
797 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
805 S_fixup_errno_string(pTHX_ SV* sv)
807 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
810 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
814 if(strEQ(SvPVX(sv), "")) {
815 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
819 /* In some locales the error string may come back as UTF-8, in which
820 * case we should turn on that flag. This didn't use to happen, and to
821 * avoid as many possible backward compatibility issues as possible, we
822 * don't turn on the flag unless we have to. So the flag stays off for
823 * an entirely invariant string. We assume that if the string looks
824 * like UTF-8 in a single script, it really is UTF-8: "text in any
825 * other encoding that uses bytes with the high bit set is extremely
826 * unlikely to pass a UTF-8 validity test"
827 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
828 * potential that we will get it wrong however, especially on short
829 * error message text, so do an additional check. */
830 if ( ! IN_BYTES /* respect 'use bytes' */
831 && is_utf8_non_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
833 #ifdef USE_LOCALE_MESSAGES
835 && _is_cur_LC_category_utf8(LC_MESSAGES)
837 #else /* If can't check directly, at least can see if script is consistent,
838 under UTF-8, which gives us an extra measure of confidence. */
840 && isSCRIPT_RUN((const U8 *) SvPVX_const(sv), (U8 *) SvEND(sv),
841 TRUE) /* Means assume UTF-8 */
851 =for apidoc_section Errno
852 =for apidoc sv_string_from_errnum
854 Generates the message string describing an OS error and returns it as
855 an SV. C<errnum> must be a value that C<errno> could take, identifying
858 If C<tgtsv> is non-null then the string will be written into that SV
859 (overwriting existing content) and it will be returned. If C<tgtsv>
860 is a null pointer then the string will be written into a new mortal SV
861 which will be returned.
863 The message will be taken from whatever locale would be used by C<$!>,
864 and will be encoded in the SV in whatever manner would be used by C<$!>.
865 The details of this process are subject to future change. Currently,
866 the message is taken from the C locale by default (usually producing an
867 English message), and from the currently selected locale when in the scope
868 of the C<use locale> pragma. A heuristic attempt is made to decode the
869 message from the locale's character encoding, but it will only be decoded
870 as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
871 locale, usually in an ISO-8859-1 locale, and never in any other locale.
873 The SV is always returned containing an actual string, and with no other
874 OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
875 (meaning success), and if no useful message is available then a useless
876 string (currently empty) is returned.
882 Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
886 tgtsv = sv_newmortal();
887 errstr = my_strerror(errnum);
889 sv_setpv(tgtsv, errstr);
890 fixup_errno_string(tgtsv);
903 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
906 const char *s = NULL;
908 const char * const remaining = mg->mg_ptr + 1;
911 PERL_ARGS_ASSERT_MAGIC_GET;
915 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
917 CALLREG_NUMBUF_FETCH(rx,paren,sv);
924 nextchar = *remaining;
925 switch (*mg->mg_ptr) {
926 case '\001': /* ^A */
927 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
930 if (SvTAINTED(PL_bodytarget))
933 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
934 if (nextchar == '\0') {
935 sv_setiv(sv, (IV)PL_minus_c);
937 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
938 sv_setiv(sv, (IV)STATUS_NATIVE);
942 case '\004': /* ^D */
943 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
945 case '\005': /* ^E */
946 if (nextchar != '\0') {
947 if (strEQ(remaining, "NCODING"))
952 #if defined(VMS) || defined(OS2) || defined(WIN32)
956 $DESCRIPTOR(msgdsc,msg);
957 sv_setnv(sv,(NV) vaxc$errno);
958 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
959 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
964 if (!(_emx_env & 0x200)) { /* Under DOS */
965 sv_setnv(sv, (NV)errno);
966 sv_setpv(sv, errno ? my_strerror(errno) : "");
968 if (errno != errno_isOS2) {
969 const int tmp = _syserrno();
970 if (tmp) /* 2nd call to _syserrno() makes it 0 */
973 sv_setnv(sv, (NV)Perl_rc);
974 sv_setpv(sv, os2error(Perl_rc));
976 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
977 fixup_errno_string(sv);
979 # elif defined(WIN32)
981 const DWORD dwErr = GetLastError();
982 sv_setnv(sv, (NV)dwErr);
984 PerlProc_GetOSError(sv, dwErr);
985 fixup_errno_string(sv);
992 # error Missing code for platform
995 SvNOK_on(sv); /* what a wonderful hack! */
997 #endif /* End of platforms with special handling for $^E; others just fall
1005 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1007 sv_setnv(sv, (NV)errno);
1010 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1011 sv_setpv(sv, os2error(Perl_rc));
1018 sv_string_from_errnum(errno, sv);
1019 /* If no useful string is available, don't
1020 * claim to have a string part. The SvNOK_on()
1021 * below will cause just the number part to be valid */
1029 SvNOK_on(sv); /* what a wonderful hack! */
1032 case '\006': /* ^F */
1033 if (nextchar == '\0') {
1034 sv_setiv(sv, (IV)PL_maxsysfd);
1037 case '\007': /* ^GLOBAL_PHASE */
1038 if (strEQ(remaining, "LOBAL_PHASE")) {
1039 sv_setpvn(sv, PL_phase_names[PL_phase],
1040 strlen(PL_phase_names[PL_phase]));
1043 case '\010': /* ^H */
1044 sv_setuv(sv, PL_hints);
1046 case '\011': /* ^I */ /* NOT \t in EBCDIC */
1047 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
1049 case '\014': /* ^LAST_FH */
1050 if (strEQ(remaining, "AST_FH")) {
1051 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
1052 assert(isGV_with_GP(PL_last_in_gv));
1053 SV_CHECK_THINKFIRST_COW_DROP(sv);
1054 prepare_SV_for_RV(sv);
1056 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1064 case '\017': /* ^O & ^OPEN */
1065 if (nextchar == '\0') {
1066 sv_setpv(sv, PL_osname);
1069 else if (strEQ(remaining, "PEN")) {
1070 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
1074 sv_setiv(sv, (IV)PL_perldb);
1076 case '\023': /* ^S */
1077 if (nextchar == '\0') {
1078 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
1080 else if (PL_in_eval)
1081 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
1085 else if (strEQ(remaining, "AFE_LOCALES")) {
1087 #if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1089 sv_setuv(sv, (UV) 1);
1092 sv_setuv(sv, (UV) 0);
1098 case '\024': /* ^T */
1099 if (nextchar == '\0') {
1101 sv_setnv(sv, PL_basetime);
1103 sv_setiv(sv, (IV)PL_basetime);
1106 else if (strEQ(remaining, "AINT"))
1107 sv_setiv(sv, TAINTING_get
1108 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
1111 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
1112 if (strEQ(remaining, "NICODE"))
1113 sv_setuv(sv, (UV) PL_unicode);
1114 else if (strEQ(remaining, "TF8LOCALE"))
1115 sv_setuv(sv, (UV) PL_utf8locale);
1116 else if (strEQ(remaining, "TF8CACHE"))
1117 sv_setiv(sv, (IV) PL_utf8cache);
1119 case '\027': /* ^W & $^WARNING_BITS */
1120 if (nextchar == '\0')
1121 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
1122 else if (strEQ(remaining, "ARNING_BITS")) {
1123 if (PL_compiling.cop_warnings == pWARN_NONE) {
1124 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
1126 else if (PL_compiling.cop_warnings == pWARN_STD) {
1129 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1130 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1133 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1134 *PL_compiling.cop_warnings);
1138 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1139 sv_setiv(sv, w32_sloppystat);
1144 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1145 paren = RX_LASTPAREN(rx);
1147 goto do_numbuf_fetch;
1150 case '\016': /* ^N */
1151 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1152 paren = RX_LASTCLOSEPAREN(rx);
1154 goto do_numbuf_fetch;
1158 if (GvIO(PL_last_in_gv)) {
1159 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1164 sv_setiv(sv, (IV)STATUS_CURRENT);
1165 #ifdef COMPLEX_STATUS
1166 SvUPGRADE(sv, SVt_PVLV);
1167 LvTARGOFF(sv) = PL_statusvalue;
1168 LvTARGLEN(sv) = PL_statusvalue_vms;
1173 if (GvIOp(PL_defoutgv))
1174 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1178 sv_setpv(sv,GvENAME(PL_defoutgv));
1179 sv_catpvs(sv,"_TOP");
1183 if (GvIOp(PL_defoutgv))
1184 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1186 s = GvENAME(PL_defoutgv);
1190 if (GvIO(PL_defoutgv))
1191 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1194 if (GvIO(PL_defoutgv))
1195 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1198 if (GvIO(PL_defoutgv))
1199 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1208 if (GvIO(PL_defoutgv))
1209 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1213 sv_copypv(sv, PL_ors_sv);
1219 IV const pid = (IV)PerlProc_getpid();
1220 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1221 /* never set manually, or at least not since last fork */
1223 /* never unsafe, even if reading in a tainted expression */
1226 /* else a value has been assigned manually, so do nothing */
1230 sv_setuid(sv, PerlProc_getuid());
1233 sv_setuid(sv, PerlProc_geteuid());
1236 sv_setgid(sv, PerlProc_getgid());
1239 sv_setgid(sv, PerlProc_getegid());
1241 #ifdef HAS_GETGROUPS
1243 Groups_t *gary = NULL;
1244 I32 num_groups = getgroups(0, gary);
1245 if (num_groups > 0) {
1247 Newx(gary, num_groups, Groups_t);
1248 num_groups = getgroups(num_groups, gary);
1249 for (i = 0; i < num_groups; i++)
1250 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
1254 (void)SvIOK_on(sv); /* what a wonderful hack! */
1268 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1270 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1272 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1274 if (uf && uf->uf_val)
1275 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1280 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1282 STRLEN len = 0, klen;
1283 const char * const key = MgPV_const(mg,klen);
1286 PERL_ARGS_ASSERT_MAGIC_SETENV;
1290 /* defined environment variables are byte strings; unfortunately
1291 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1292 (void)SvPV_force_nomg_nolen(sv);
1293 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1295 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1301 my_setenv(key, s); /* does the deed */
1303 #ifdef DYNAMIC_ENV_FETCH
1304 /* We just undefd an environment var. Is a replacement */
1305 /* waiting in the wings? */
1307 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1309 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1313 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1314 /* And you'll never guess what the dog had */
1315 /* in its mouth... */
1317 MgTAINTEDDIR_off(mg);
1319 if (s && memEQs(key, klen, "DCL$PATH")) {
1320 char pathbuf[256], eltbuf[256], *cp, *elt;
1323 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1325 do { /* DCL$PATH may be a search list */
1326 while (1) { /* as may dev portion of any element */
1327 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1328 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1329 cando_by_name(S_IWUSR,0,elt) ) {
1330 MgTAINTEDDIR_on(mg);
1334 if ((cp = strchr(elt, ':')) != NULL)
1336 if (my_trnlnm(elt, eltbuf, j++))
1342 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1345 if (s && memEQs(key, klen, "PATH")) {
1346 const char * const strend = s + len;
1348 /* set MGf_TAINTEDDIR if any component of the new path is
1349 * relative or world-writeable */
1350 while (s < strend) {
1354 #ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1355 const char path_sep = PL_perllib_sep;
1357 const char path_sep = ':';
1359 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
1360 s, strend, path_sep, &i);
1362 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1364 /* no colon thus no device name -- assume relative path */
1365 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1366 /* Using Unix separator, e.g. under bash, so act line Unix */
1367 || (PL_perllib_sep == ':' && *tmpbuf != '/')
1369 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1371 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1372 MgTAINTEDDIR_on(mg);
1378 #endif /* neither OS2 nor WIN32 nor MSDOS */
1384 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1386 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1387 PERL_UNUSED_ARG(sv);
1388 my_setenv(MgPV_nolen_const(mg),NULL);
1393 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1395 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1396 PERL_UNUSED_ARG(mg);
1398 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1400 if (PL_localizing) {
1403 hv_iterinit(MUTABLE_HV(sv));
1404 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1406 my_setenv(hv_iterkey(entry, &keylen),
1407 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1415 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1417 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1418 PERL_UNUSED_ARG(sv);
1419 PERL_UNUSED_ARG(mg);
1421 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1429 #ifdef HAS_SIGPROCMASK
1431 restore_sigmask(pTHX_ SV *save_sv)
1433 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1434 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1438 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1440 /* Are we fetching a signal entry? */
1441 int i = (I16)mg->mg_private;
1443 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1447 const char * sig = MgPV_const(mg, siglen);
1448 mg->mg_private = i = whichsig_pvn(sig, siglen);
1453 sv_setsv(sv,PL_psig_ptr[i]);
1455 Sighandler_t sigstate = rsignal_state(i);
1456 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1457 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1460 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1461 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1464 /* cache state so we don't fetch it again */
1465 if(sigstate == (Sighandler_t) SIG_IGN)
1466 sv_setpvs(sv,"IGNORE");
1469 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1476 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1478 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1480 magic_setsig(NULL, mg);
1481 return sv_unmagic(sv, mg->mg_type);
1485 #ifdef PERL_USE_3ARG_SIGHANDLER
1487 Perl_csighandler(int sig, Siginfo_t *sip, void *uap)
1489 Perl_csighandler3(sig, sip, uap);
1493 Perl_csighandler(int sig)
1495 Perl_csighandler3(sig, NULL, NULL);
1500 Perl_csighandler1(int sig)
1502 Perl_csighandler3(sig, NULL, NULL);
1505 /* Handler intended to directly handle signal calls from the kernel.
1506 * (Depending on configuration, the kernel may actually call one of the
1507 * wrappers csighandler() or csighandler1() instead.)
1508 * It either queues up the signal or dispatches it immediately depending
1509 * on whether safe signals are enabled and whether the signal is capable
1510 * of being deferred (e.g. SEGV isn't).
1514 Perl_csighandler3(int sig, Siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1516 #ifdef PERL_GET_SIG_CONTEXT
1517 dTHXa(PERL_GET_SIG_CONTEXT);
1522 #ifdef PERL_USE_3ARG_SIGHANDLER
1523 #if defined(__cplusplus) && defined(__GNUC__)
1524 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1525 * parameters would be warned about. */
1526 PERL_UNUSED_ARG(sip);
1527 PERL_UNUSED_ARG(uap);
1531 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1532 (void) rsignal(sig, PL_csighandlerp);
1533 if (PL_sig_ignoring[sig]) return;
1535 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1536 if (PL_sig_defaulting[sig])
1537 #ifdef KILL_BY_SIGPRC
1538 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1553 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1554 /* Call the perl level handler now--
1555 * with risk we may be in malloc() or being destructed etc. */
1557 if (PL_sighandlerp == Perl_sighandler)
1558 /* default handler, so can call perly_sighandler() directly
1559 * rather than via Perl_sighandler, passing the extra
1560 * 'safe = false' arg
1562 Perl_perly_sighandler(sig, NULL, NULL, 0 /* unsafe */);
1564 #ifdef PERL_USE_3ARG_SIGHANDLER
1565 (*PL_sighandlerp)(sig, NULL, NULL);
1567 (*PL_sighandlerp)(sig);
1571 if (!PL_psig_pend) return;
1572 /* Set a flag to say this signal is pending, that is awaiting delivery after
1573 * the current Perl opcode completes */
1574 PL_psig_pend[sig]++;
1576 #ifndef SIG_PENDING_DIE_COUNT
1577 # define SIG_PENDING_DIE_COUNT 120
1579 /* Add one to say _a_ signal is pending */
1580 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1581 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1582 (unsigned long)SIG_PENDING_DIE_COUNT);
1586 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1588 Perl_csighandler_init(void)
1591 if (PL_sig_handlers_initted) return;
1593 for (sig = 1; sig < SIG_SIZE; sig++) {
1594 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1596 PL_sig_defaulting[sig] = 1;
1597 (void) rsignal(sig, PL_csighandlerp);
1599 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1600 PL_sig_ignoring[sig] = 0;
1603 PL_sig_handlers_initted = 1;
1607 #if defined HAS_SIGPROCMASK
1609 unblock_sigmask(pTHX_ void* newset)
1611 PERL_UNUSED_CONTEXT;
1612 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1617 Perl_despatch_signals(pTHX)
1621 for (sig = 1; sig < SIG_SIZE; sig++) {
1622 if (PL_psig_pend[sig]) {
1624 #ifdef HAS_SIGPROCMASK
1625 /* From sigaction(2) (FreeBSD man page):
1626 * | Signal routines normally execute with the signal that
1627 * | caused their invocation blocked, but other signals may
1629 * Emulation of this behavior (from within Perl) is enabled
1633 sigset_t newset, oldset;
1635 sigemptyset(&newset);
1636 sigaddset(&newset, sig);
1637 sigprocmask(SIG_BLOCK, &newset, &oldset);
1638 was_blocked = sigismember(&oldset, sig);
1640 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1642 SAVEFREESV(save_sv);
1643 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1646 PL_psig_pend[sig] = 0;
1647 if (PL_sighandlerp == Perl_sighandler)
1648 /* default handler, so can call perly_sighandler() directly
1649 * rather than via Perl_sighandler, passing the extra
1652 Perl_perly_sighandler(sig, NULL, NULL, 1 /* safe */);
1654 #ifdef PERL_USE_3ARG_SIGHANDLER
1655 (*PL_sighandlerp)(sig, NULL, NULL);
1657 (*PL_sighandlerp)(sig);
1660 #ifdef HAS_SIGPROCMASK
1669 /* sv of NULL signifies that we're acting as magic_clearsig. */
1671 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1675 /* Need to be careful with SvREFCNT_dec(), because that can have side
1676 * effects (due to closures). We must make sure that the new disposition
1677 * is in place before it is called.
1681 #ifdef HAS_SIGPROCMASK
1685 const char *s = MgPV_const(mg,len);
1687 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1690 if (memEQs(s, len, "__DIE__"))
1692 else if (memEQs(s, len, "__WARN__")
1693 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1694 /* Merge the existing behaviours, which are as follows:
1695 magic_setsig, we always set svp to &PL_warnhook
1696 (hence we always change the warnings handler)
1697 For magic_clearsig, we don't change the warnings handler if it's
1698 set to the &PL_warnhook. */
1701 SV *tmp = sv_newmortal();
1702 Perl_croak(aTHX_ "No such hook: %s",
1703 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1707 if (*svp != PERL_WARNHOOK_FATAL)
1713 i = (I16)mg->mg_private;
1715 i = whichsig_pvn(s, len); /* ...no, a brick */
1716 mg->mg_private = (U16)i;
1720 SV *tmp = sv_newmortal();
1721 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1722 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1726 #ifdef HAS_SIGPROCMASK
1727 /* Avoid having the signal arrive at a bad time, if possible. */
1730 sigprocmask(SIG_BLOCK, &set, &save);
1732 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
1733 SAVEFREESV(save_sv);
1734 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1737 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1738 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1740 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1741 PL_sig_ignoring[i] = 0;
1743 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1744 PL_sig_defaulting[i] = 0;
1746 to_dec = PL_psig_ptr[i];
1748 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1749 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1751 /* Signals don't change name during the program's execution, so once
1752 they're cached in the appropriate slot of PL_psig_name, they can
1755 Ideally we'd find some way of making SVs at (C) compile time, or
1756 at least, doing most of the work. */
1757 if (!PL_psig_name[i]) {
1758 const char* name = PL_sig_name[i];
1759 PL_psig_name[i] = newSVpvn(name, strlen(name));
1760 SvREADONLY_on(PL_psig_name[i]);
1763 SvREFCNT_dec(PL_psig_name[i]);
1764 PL_psig_name[i] = NULL;
1765 PL_psig_ptr[i] = NULL;
1768 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1770 (void)rsignal(i, PL_csighandlerp);
1773 *svp = SvREFCNT_inc_simple_NN(sv);
1775 if (sv && SvOK(sv)) {
1776 s = SvPV_force(sv, len);
1780 if (sv && memEQs(s, len,"IGNORE")) {
1782 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1783 PL_sig_ignoring[i] = 1;
1784 (void)rsignal(i, PL_csighandlerp);
1786 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1790 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1792 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1793 PL_sig_defaulting[i] = 1;
1794 (void)rsignal(i, PL_csighandlerp);
1796 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1802 * We should warn if HINT_STRICT_REFS, but without
1803 * access to a known hint bit in a known OP, we can't
1804 * tell whether HINT_STRICT_REFS is in force or not.
1806 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
1807 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1810 (void)rsignal(i, PL_csighandlerp);
1812 *svp = SvREFCNT_inc_simple_NN(sv);
1816 #ifdef HAS_SIGPROCMASK
1820 SvREFCNT_dec(to_dec);
1823 #endif /* !PERL_MICRO */
1826 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1828 PERL_ARGS_ASSERT_MAGIC_SETISA;
1829 PERL_UNUSED_ARG(sv);
1831 /* Skip _isaelem because _isa will handle it shortly */
1832 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1835 return magic_clearisa(NULL, mg);
1838 /* sv of NULL signifies that we're acting as magic_setisa. */
1840 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1843 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1845 /* Bail out if destruction is going on */
1846 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1849 av_clear(MUTABLE_AV(sv));
1851 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1852 /* This occurs with setisa_elem magic, which calls this
1854 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1857 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1858 SV **svp = AvARRAY((AV *)mg->mg_obj);
1859 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1861 stash = GvSTASH((GV *)*svp++);
1862 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1869 (const GV *)mg->mg_obj
1872 /* The stash may have been detached from the symbol table, so check its
1873 name before doing anything. */
1874 if (stash && HvENAME_get(stash))
1875 mro_isa_changed_in(stash);
1881 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1883 HV * const hv = MUTABLE_HV(LvTARG(sv));
1886 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1887 PERL_UNUSED_ARG(mg);
1890 (void) hv_iterinit(hv);
1891 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1894 while (hv_iternext(hv))
1899 sv_setiv(sv, (IV)i);
1904 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1906 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1907 PERL_UNUSED_ARG(mg);
1909 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1915 =for apidoc_section Magic
1916 =for apidoc magic_methcall
1918 Invoke a magic method (like FETCH).
1920 C<sv> and C<mg> are the tied thingy and the tie magic.
1922 C<meth> is the name of the method to call.
1924 C<argc> is the number of args (in addition to $self) to pass to the method.
1926 The C<flags> can be:
1928 G_DISCARD invoke method with G_DISCARD flag and don't
1930 G_UNDEF_FILL fill the stack with argc pointers to
1933 The arguments themselves are any values following the C<flags> argument.
1935 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1942 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1948 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1952 if (flags & G_WRITING_TO_STDERR) {
1956 SAVESPTR(PL_stderrgv);
1960 PUSHSTACKi(PERLSI_MAGIC);
1963 /* EXTEND() expects a signed argc; don't wrap when casting */
1964 assert(argc <= I32_MAX);
1965 EXTEND(SP, (I32)argc+1);
1966 PUSHs(SvTIED_obj(sv, mg));
1967 if (flags & G_UNDEF_FILL) {
1969 PUSHs(&PL_sv_undef);
1971 } else if (argc > 0) {
1973 va_start(args, argc);
1976 SV *const this_sv = va_arg(args, SV *);
1983 if (flags & G_DISCARD) {
1984 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1987 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1988 ret = *PL_stack_sp--;
1991 if (flags & G_WRITING_TO_STDERR)
1997 /* wrapper for magic_methcall that creates the first arg */
2000 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
2005 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
2008 if (mg->mg_len >= 0) {
2009 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
2011 else if (mg->mg_len == HEf_SVKEY)
2012 arg1 = MUTABLE_SV(mg->mg_ptr);
2014 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
2015 arg1 = newSViv((IV)(mg->mg_len));
2019 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
2021 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
2025 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
2029 PERL_ARGS_ASSERT_MAGIC_METHPACK;
2031 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
2038 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
2040 PERL_ARGS_ASSERT_MAGIC_GETPACK;
2042 if (mg->mg_type == PERL_MAGIC_tiedelem)
2043 mg->mg_flags |= MGf_GSKIP;
2044 magic_methpack(sv,mg,SV_CONST(FETCH));
2049 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
2054 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2056 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2057 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2058 * public flags indicate its value based on copying from $val. Doing
2059 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2060 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2061 * wrong if $val happened to be tainted, as sv hasn't got magic
2062 * enabled, even though taint magic is in the chain. In which case,
2063 * fake up a temporary tainted value (this is easier than temporarily
2064 * re-enabling magic on sv). */
2066 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
2067 && (tmg->mg_len & 1))
2069 val = sv_mortalcopy(sv);
2075 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
2080 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
2082 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2084 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
2085 return magic_methpack(sv,mg,SV_CONST(DELETE));
2090 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
2095 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2097 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
2099 retval = SvIV(retsv)-1;
2101 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
2103 return (U32) retval;
2107 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
2109 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2111 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
2116 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
2120 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2122 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2123 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
2130 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
2132 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2134 return magic_methpack(sv,mg,SV_CONST(EXISTS));
2138 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2141 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2142 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
2144 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2146 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2148 if (HvEITER_get(hv))
2149 /* we are in an iteration so the hash cannot be empty */
2151 /* no xhv_eiter so now use FIRSTKEY */
2152 key = sv_newmortal();
2153 magic_nextpack(MUTABLE_SV(hv), mg, key);
2154 HvEITER_set(hv, NULL); /* need to reset iterator */
2155 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2158 /* there is a SCALAR method that we can call */
2159 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2161 retval = &PL_sv_undef;
2166 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2170 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2172 /* The magic ptr/len for the debugger's hash should always be an SV. */
2173 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2174 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
2175 (IV)mg->mg_len, mg->mg_ptr);
2178 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2179 setting/clearing debugger breakpoints is not a hot path. */
2180 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2181 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2183 if (svp && SvIOKp(*svp)) {
2184 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2186 #ifdef PERL_DEBUG_READONLY_OPS
2187 Slab_to_rw(OpSLAB(o));
2189 /* set or clear breakpoint in the relevant control op */
2191 o->op_flags |= OPf_SPECIAL;
2193 o->op_flags &= ~OPf_SPECIAL;
2194 #ifdef PERL_DEBUG_READONLY_OPS
2195 Slab_to_ro(OpSLAB(o));
2203 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2205 AV * const obj = MUTABLE_AV(mg->mg_obj);
2207 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2210 sv_setiv(sv, AvFILL(obj));
2218 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2220 AV * const obj = MUTABLE_AV(mg->mg_obj);
2222 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2225 av_fill(obj, SvIV(sv));
2227 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2228 "Attempt to set length of freed array");
2234 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2236 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2237 PERL_UNUSED_ARG(sv);
2238 PERL_UNUSED_CONTEXT;
2240 /* Reset the iterator when the array is cleared */
2241 if (sizeof(IV) == sizeof(SSize_t)) {
2242 *((IV *) &(mg->mg_len)) = 0;
2245 *((IV *) mg->mg_ptr) = 0;
2252 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2254 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2255 PERL_UNUSED_ARG(sv);
2257 /* during global destruction, mg_obj may already have been freed */
2258 if (PL_in_clean_all)
2261 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2264 /* arylen scalar holds a pointer back to the array, but doesn't own a
2265 reference. Hence the we (the array) are about to go away with it
2266 still pointing at us. Clear its pointer, else it would be pointing
2267 at free memory. See the comment in sv_magic about reference loops,
2268 and why it can't own a reference to us. */
2275 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2277 SV* const lsv = LvTARG(sv);
2278 MAGIC * const found = mg_find_mglob(lsv);
2280 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2281 PERL_UNUSED_ARG(mg);
2283 if (found && found->mg_len != -1) {
2284 STRLEN i = found->mg_len;
2285 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2286 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2295 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2297 SV* const lsv = LvTARG(sv);
2303 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2304 PERL_UNUSED_ARG(mg);
2306 found = mg_find_mglob(lsv);
2310 found = sv_magicext_mglob(lsv);
2312 else if (!SvOK(sv)) {
2316 s = SvPV_const(lsv, len);
2321 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
2331 else if (pos > (SSize_t)len)
2334 found->mg_len = pos;
2335 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2341 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2344 SV * const lsv = LvTARG(sv);
2345 const char * const tmps = SvPV_const(lsv,len);
2346 STRLEN offs = LvTARGOFF(sv);
2347 STRLEN rem = LvTARGLEN(sv);
2348 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2349 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
2351 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2352 PERL_UNUSED_ARG(mg);
2354 if (!translate_substr_offsets(
2355 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2356 negoff ? -(IV)offs : (IV)offs, !negoff,
2357 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2359 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2365 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2366 sv_setpvn(sv, tmps + offs, rem);
2373 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2375 STRLEN len, lsv_len, oldtarglen, newtarglen;
2376 const char * const tmps = SvPV_const(sv, len);
2377 SV * const lsv = LvTARG(sv);
2378 STRLEN lvoff = LvTARGOFF(sv);
2379 STRLEN lvlen = LvTARGLEN(sv);
2380 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2381 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
2383 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2384 PERL_UNUSED_ARG(mg);
2388 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2389 "Attempt to use reference as lvalue in substr"
2391 SvPV_force_nomg(lsv,lsv_len);
2392 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2393 if (!translate_substr_offsets(
2395 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2396 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2398 Perl_croak(aTHX_ "substr outside of string");
2401 sv_utf8_upgrade_nomg(lsv);
2402 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2403 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2404 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2407 else if (SvUTF8(lsv)) {
2409 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2411 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2412 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2416 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2419 if (!neglen) LvTARGLEN(sv) = newtarglen;
2420 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2426 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2428 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2429 PERL_UNUSED_ARG(sv);
2430 #ifdef NO_TAINT_SUPPORT
2431 PERL_UNUSED_ARG(mg);
2434 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2439 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2441 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2442 PERL_UNUSED_ARG(sv);
2444 /* update taint status */
2453 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2455 SV * const lsv = LvTARG(sv);
2456 char errflags = LvFLAGS(sv);
2458 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2459 PERL_UNUSED_ARG(mg);
2461 /* non-zero errflags implies deferred out-of-range condition */
2462 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
2463 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2469 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2471 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2472 PERL_UNUSED_ARG(mg);
2473 do_vecset(sv); /* XXX slurp this routine */
2478 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2481 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2482 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2484 if (LvTARGLEN(sv)) {
2486 SV * const ahv = LvTARG(sv);
2487 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2491 else if (LvSTARGOFF(sv) >= 0) {
2492 AV *const av = MUTABLE_AV(LvTARG(sv));
2493 if (LvSTARGOFF(sv) <= AvFILL(av))
2495 if (SvRMAGICAL(av)) {
2496 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2497 targ = svp ? *svp : NULL;
2500 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2503 if (targ && (targ != &PL_sv_undef)) {
2504 /* somebody else defined it for us */
2505 SvREFCNT_dec(LvTARG(sv));
2506 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2508 SvREFCNT_dec(mg->mg_obj);
2510 mg->mg_flags &= ~MGf_REFCOUNTED;
2519 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2521 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2523 sv_setsv(sv, defelem_target(sv, mg));
2528 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2530 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2531 PERL_UNUSED_ARG(mg);
2535 sv_setsv(LvTARG(sv), sv);
2536 SvSETMAGIC(LvTARG(sv));
2542 Perl_vivify_defelem(pTHX_ SV *sv)
2547 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2549 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2552 SV * const ahv = LvTARG(sv);
2553 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2556 if (!value || value == &PL_sv_undef)
2557 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2559 else if (LvSTARGOFF(sv) < 0)
2560 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2562 AV *const av = MUTABLE_AV(LvTARG(sv));
2563 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2564 LvTARG(sv) = NULL; /* array can't be extended */
2566 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2567 if (!svp || !(value = *svp))
2568 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2571 SvREFCNT_inc_simple_void(value);
2572 SvREFCNT_dec(LvTARG(sv));
2575 SvREFCNT_dec(mg->mg_obj);
2577 mg->mg_flags &= ~MGf_REFCOUNTED;
2581 Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2583 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2584 PERL_UNUSED_ARG(mg);
2585 sv_unmagic(sv, PERL_MAGIC_nonelem);
2590 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2592 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2593 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2598 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2600 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2601 PERL_UNUSED_CONTEXT;
2602 PERL_UNUSED_ARG(sv);
2608 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2610 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2612 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2614 if (uf && uf->uf_set)
2615 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2620 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2622 const char type = mg->mg_type;
2624 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2626 assert( type == PERL_MAGIC_fm
2627 || type == PERL_MAGIC_qr
2628 || type == PERL_MAGIC_bm);
2629 return sv_unmagic(sv, type);
2632 #ifdef USE_LOCALE_COLLATE
2634 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2636 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2639 * RenE<eacute> Descartes said "I think not."
2640 * and vanished with a faint plop.
2642 PERL_UNUSED_CONTEXT;
2643 PERL_UNUSED_ARG(sv);
2645 Safefree(mg->mg_ptr);
2651 #endif /* USE_LOCALE_COLLATE */
2653 /* Just clear the UTF-8 cache data. */
2655 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2657 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2658 PERL_UNUSED_CONTEXT;
2659 PERL_UNUSED_ARG(sv);
2660 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2662 mg->mg_len = -1; /* The mg_len holds the len cache. */
2667 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2669 const char *bad = NULL;
2670 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2671 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2672 switch (mg->mg_private & OPpLVREF_TYPE) {
2674 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2678 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2682 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2686 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2690 /* diag_listed_as: Assigned value is not %s reference */
2691 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2692 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2695 SV * const old = PAD_SV(mg->mg_len);
2696 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2701 gv_setref(mg->mg_obj, sv);
2702 SvSETMAGIC(mg->mg_obj);
2705 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2706 SvREFCNT_inc_simple_NN(SvRV(sv)));
2709 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2710 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2712 if (mg->mg_flags & MGf_PERSIST)
2713 NOOP; /* This sv is in use as an iterator var and will be reused,
2714 so we must leave the magic. */
2716 /* This sv could be returned by the assignment op, so clear the
2717 magic, as lvrefs are an implementation detail that must not be
2718 leaked to the user. */
2719 sv_unmagic(sv, PERL_MAGIC_lvref);
2724 S_set_dollarzero(pTHX_ SV *sv)
2725 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2731 #ifdef HAS_SETPROCTITLE
2732 /* The BSDs don't show the argv[] in ps(1) output, they
2733 * show a string from the process struct and provide
2734 * the setproctitle() routine to manipulate that. */
2735 if (PL_origalen != 1) {
2736 s = SvPV_const(sv, len);
2737 # if __FreeBSD_version > 410001 || defined(__DragonFly__)
2738 /* The leading "-" removes the "perl: " prefix,
2739 * but not the "(perl) suffix from the ps(1)
2740 * output, because that's what ps(1) shows if the
2741 * argv[] is modified. */
2742 setproctitle("-%s", s);
2743 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2744 /* This doesn't really work if you assume that
2745 * $0 = 'foobar'; will wipe out 'perl' from the $0
2746 * because in ps(1) output the result will be like
2747 * sprintf("perl: %s (perl)", s)
2748 * I guess this is a security feature:
2749 * one (a user process) cannot get rid of the original name.
2751 setproctitle("%s", s);
2754 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2755 if (PL_origalen != 1) {
2757 s = SvPV_const(sv, len);
2758 un.pst_command = (char *)s;
2759 pstat(PSTAT_SETCMD, un, len, 0, 0);
2762 if (PL_origalen > 1) {
2764 /* PL_origalen is set in perl_parse(). */
2765 s = SvPV_force(sv,len);
2766 if (len >= (STRLEN)PL_origalen-1) {
2767 /* Longer than original, will be truncated. We assume that
2768 * PL_origalen bytes are available. */
2769 Copy(s, PL_origargv[0], PL_origalen-1, char);
2772 /* Shorter than original, will be padded. */
2774 /* Special case for Mac OS X: see [perl #38868] */
2777 /* Is the space counterintuitive? Yes.
2778 * (You were expecting \0?)
2779 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2781 const int pad = ' ';
2783 Copy(s, PL_origargv[0], len, char);
2784 PL_origargv[0][len] = 0;
2785 memset(PL_origargv[0] + len + 1,
2786 pad, PL_origalen - len - 1);
2788 PL_origargv[0][PL_origalen-1] = 0;
2789 for (i = 1; i < PL_origargc; i++)
2791 #ifdef HAS_PRCTL_SET_NAME
2792 /* Set the legacy process name in addition to the POSIX name on Linux */
2793 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2794 /* diag_listed_as: SKIPME */
2795 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2803 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2813 PERL_ARGS_ASSERT_MAGIC_SET;
2817 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2819 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2821 /* Croak with a READONLY error when a numbered match var is
2822 * set without a previous pattern match. Unless it's C<local $1>
2825 if (!PL_localizing) {
2826 Perl_croak_no_modify();
2832 switch (*mg->mg_ptr) {
2833 case '\001': /* ^A */
2834 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2835 else SvOK_off(PL_bodytarget);
2836 FmLINES(PL_bodytarget) = 0;
2837 if (SvPOK(PL_bodytarget)) {
2838 char *s = SvPVX(PL_bodytarget);
2839 char *e = SvEND(PL_bodytarget);
2840 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
2841 FmLINES(PL_bodytarget)++;
2845 /* mg_set() has temporarily made sv non-magical */
2847 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2848 SvTAINTED_on(PL_bodytarget);
2850 SvTAINTED_off(PL_bodytarget);
2853 case '\003': /* ^C */
2854 PL_minus_c = cBOOL(SvIV(sv));
2857 case '\004': /* ^D */
2860 const char *s = SvPV_nolen_const(sv);
2861 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2862 if (DEBUG_x_TEST || DEBUG_B_TEST)
2863 dump_all_perl(!DEBUG_B_TEST);
2866 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
2869 case '\005': /* ^E */
2870 if (*(mg->mg_ptr+1) == '\0') {
2872 set_vaxc_errno(SvIV(sv));
2873 #elif defined(WIN32)
2874 SetLastError( SvIV(sv) );
2876 os2_setsyserrno(SvIV(sv));
2878 /* will anyone ever use this? */
2879 SETERRNO(SvIV(sv), 4);
2882 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2883 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
2885 case '\006': /* ^F */
2886 if (mg->mg_ptr[1] == '\0') {
2887 PL_maxsysfd = SvIV(sv);
2890 case '\010': /* ^H */
2892 U32 save_hints = PL_hints;
2893 PL_hints = SvUV(sv);
2895 /* If wasn't UTF-8, and now is, notify the parser */
2896 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2897 notify_parser_that_changed_to_utf8();
2901 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2902 Safefree(PL_inplace);
2903 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
2905 case '\016': /* ^N */
2906 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2907 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2909 case '\017': /* ^O */
2910 if (*(mg->mg_ptr+1) == '\0') {
2911 Safefree(PL_osname);
2914 TAINT_PROPER("assigning to $^O");
2915 PL_osname = savesvpv(sv);
2918 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2920 const char *const start = SvPV(sv, len);
2921 const char *out = (const char*)memchr(start, '\0', len);
2925 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2926 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2928 /* Opening for input is more common than opening for output, so
2929 ensure that hints for input are sooner on linked list. */
2930 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2932 : newSVpvs_flags("", SvUTF8(sv));
2933 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2936 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2938 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2942 case '\020': /* ^P */
2943 PL_perldb = SvIV(sv);
2944 if (PL_perldb && !PL_DBsingle)
2947 case '\024': /* ^T */
2949 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2951 PL_basetime = (Time_t)SvIV(sv);
2954 case '\025': /* ^UTF8CACHE */
2955 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2956 PL_utf8cache = (signed char) sv_2iv(sv);
2959 case '\027': /* ^W & $^WARNING_BITS */
2960 if (*(mg->mg_ptr+1) == '\0') {
2961 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2963 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2964 | (i ? G_WARN_ON : G_WARN_OFF) ;
2967 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2968 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2970 free_and_set_cop_warnings(&PL_compiling, 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 free_and_set_cop_warnings(&PL_compiling, pWARN_NONE);
2983 } else if (len >= WARNsize && !not_all) {
2984 free_and_set_cop_warnings(&PL_compiling, pWARN_ALL);
2985 PL_dowarn |= G_WARN_ONCE ;
2989 const char *const p = SvPV_const(sv, len);
2991 PL_compiling.cop_warnings
2992 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2995 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2996 PL_dowarn |= G_WARN_ONCE ;
3003 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
3004 w32_sloppystat = SvTRUE(sv);
3009 if (PL_localizing) {
3010 if (PL_localizing == 1)
3011 SAVESPTR(PL_last_in_gv);
3013 else if (SvOK(sv) && GvIO(PL_last_in_gv))
3014 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
3017 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
3018 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
3019 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
3022 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
3023 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
3024 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
3027 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
3030 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3031 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
3032 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
3035 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
3039 IO * const io = GvIO(PL_defoutgv);
3042 if ((SvIV(sv)) == 0)
3043 IoFLAGS(io) &= ~IOf_FLUSH;
3045 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3046 PerlIO *ofp = IoOFP(io);
3048 (void)PerlIO_flush(ofp);
3049 IoFLAGS(io) |= IOf_FLUSH;
3057 SV *referent = SvRV(sv);
3058 const char *reftype = sv_reftype(referent, 0);
3059 /* XXX: dodgy type check: This leaves me feeling dirty, but
3060 * the alternative is to copy pretty much the entire
3061 * sv_reftype() into this routine, or to do a full string
3062 * comparison on the return of sv_reftype() both of which
3063 * make me feel worse! NOTE, do not modify this comment
3064 * without reviewing the corresponding comment in
3065 * sv_reftype(). - Yves */
3066 if (reftype[0] == 'S' || reftype[0] == 'L') {
3067 IV val = SvIV(referent);
3069 sv_setsv(sv, PL_rs);
3070 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3071 val < 0 ? "a negative integer" : "zero");
3074 sv_setsv(sv, PL_rs);
3075 /* diag_listed_as: Setting $/ to %s reference is forbidden */
3076 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3077 *reftype == 'A' ? "n" : "", reftype);
3080 SvREFCNT_dec(PL_rs);
3081 PL_rs = newSVsv(sv);
3085 SvREFCNT_dec(PL_ors_sv);
3087 PL_ors_sv = newSVsv(sv);
3095 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3098 #ifdef COMPLEX_STATUS
3099 if (PL_localizing == 2) {
3100 SvUPGRADE(sv, SVt_PVLV);
3101 PL_statusvalue = LvTARGOFF(sv);
3102 PL_statusvalue_vms = LvTARGLEN(sv);
3106 #ifdef VMSISH_STATUS
3108 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
3111 STATUS_UNIX_EXIT_SET(SvIV(sv));
3116 # define PERL_VMS_BANG vaxc$errno
3118 # define PERL_VMS_BANG 0
3121 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3122 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3124 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
3125 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3131 /* XXX $< currently silently ignores failures */
3132 const Uid_t new_uid = SvUID(sv);
3133 PL_delaymagic_uid = new_uid;
3134 if (PL_delaymagic) {
3135 PL_delaymagic |= DM_RUID;
3136 break; /* don't do magic till later */
3139 PERL_UNUSED_RESULT(setruid(new_uid));
3140 #elif defined(HAS_SETREUID)
3141 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
3142 #elif defined(HAS_SETRESUID)
3143 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
3145 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
3147 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
3148 if (new_uid != 0 && PerlProc_getuid() == 0)
3149 PERL_UNUSED_RESULT(PerlProc_setuid(0));
3151 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
3153 Perl_croak(aTHX_ "setruid() not implemented");
3160 /* XXX $> currently silently ignores failures */
3161 const Uid_t new_euid = SvUID(sv);
3162 PL_delaymagic_euid = new_euid;
3163 if (PL_delaymagic) {
3164 PL_delaymagic |= DM_EUID;
3165 break; /* don't do magic till later */
3168 PERL_UNUSED_RESULT(seteuid(new_euid));
3169 #elif defined(HAS_SETREUID)
3170 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
3171 #elif defined(HAS_SETRESUID)
3172 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
3174 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
3175 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3177 Perl_croak(aTHX_ "seteuid() not implemented");
3184 /* XXX $( currently silently ignores failures */
3185 const Gid_t new_gid = SvGID(sv);
3186 PL_delaymagic_gid = new_gid;
3187 if (PL_delaymagic) {
3188 PL_delaymagic |= DM_RGID;
3189 break; /* don't do magic till later */
3192 PERL_UNUSED_RESULT(setrgid(new_gid));
3193 #elif defined(HAS_SETREGID)
3194 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3195 #elif defined(HAS_SETRESGID)
3196 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3198 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3199 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3201 Perl_croak(aTHX_ "setrgid() not implemented");
3208 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3209 * but you can override it if you need to.
3212 #define INVALID_GID ((Gid_t)-1)
3214 /* XXX $) currently silently ignores failures */
3216 #ifdef HAS_SETGROUPS
3218 const char *p = SvPV_const(sv, len);
3219 Groups_t *gary = NULL;
3220 const char* p_end = p + len;
3221 const char* endptr = p_end;
3223 #ifdef _SC_NGROUPS_MAX
3224 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3229 int maxgrp = NGROUPS;
3234 if (grok_atoUV(p, &uv, &endptr))
3235 new_egid = (Gid_t)uv;
3237 new_egid = INVALID_GID;
3240 for (i = 0; i < maxgrp; ++i) {
3250 Newx(gary, i + 1, Groups_t);
3252 Renew(gary, i + 1, Groups_t);
3253 if (grok_atoUV(p, &uv, &endptr))
3254 gary[i] = (Groups_t)uv;
3256 gary[i] = INVALID_GID;
3261 PERL_UNUSED_RESULT(setgroups(i, gary));
3264 #else /* HAS_SETGROUPS */
3265 new_egid = SvGID(sv);
3266 #endif /* HAS_SETGROUPS */
3267 PL_delaymagic_egid = new_egid;
3268 if (PL_delaymagic) {
3269 PL_delaymagic |= DM_EGID;
3270 break; /* don't do magic till later */
3273 PERL_UNUSED_RESULT(setegid(new_egid));
3274 #elif defined(HAS_SETREGID)
3275 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3276 #elif defined(HAS_SETRESGID)
3277 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3279 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3280 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3282 Perl_croak(aTHX_ "setegid() not implemented");
3288 PL_chopset = SvPV_force(sv,len);
3291 /* Store the pid in mg->mg_obj so we can tell when a fork has
3292 occurred. mg->mg_obj points to *$ by default, so clear it. */
3293 if (isGV(mg->mg_obj)) {
3294 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3295 SvREFCNT_dec(mg->mg_obj);
3296 mg->mg_flags |= MGf_REFCOUNTED;
3297 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3299 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3302 LOCK_DOLLARZERO_MUTEX;
3303 S_set_dollarzero(aTHX_ sv);
3304 UNLOCK_DOLLARZERO_MUTEX;
3311 =for apidoc_section Signals
3312 =for apidoc whichsig
3313 =for apidoc_item whichsig_pv
3314 =for apidoc_item whichsig_pvn
3315 =for apidoc_item whichsig_sv
3317 These all convert a signal name into its corresponding signal number;
3318 returning -1 if no corresponding number was found.
3320 They differ only in the source of the signal name:
3322 C<whichsig_pv> takes the name from the C<NUL>-terminated string starting at
3325 C<whichsig> is merely a different spelling, a synonym, of C<whichsig_pv>.
3327 C<whichsig_pvn> takes the name from the string starting at C<sig>, with length
3330 C<whichsig_sv> takes the name from the PV stored in the SV C<sigsv>.
3336 Perl_whichsig_sv(pTHX_ SV *sigsv)
3340 PERL_ARGS_ASSERT_WHICHSIG_SV;
3341 sigpv = SvPV_const(sigsv, siglen);
3342 return whichsig_pvn(sigpv, siglen);
3346 Perl_whichsig_pv(pTHX_ const char *sig)
3348 PERL_ARGS_ASSERT_WHICHSIG_PV;
3349 return whichsig_pvn(sig, strlen(sig));
3353 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3357 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3358 PERL_UNUSED_CONTEXT;
3360 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3361 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3362 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3364 if (memEQs(sig, len, "CHLD"))
3368 if (memEQs(sig, len, "CLD"))
3375 /* Perl_sighandler(), Perl_sighandler1(), Perl_sighandler3():
3376 * these three function are intended to be called by the OS as 'C' level
3377 * signal handler functions in the case where unsafe signals are being
3378 * used - i.e. they immediately invoke Perl_perly_sighandler() to call the
3379 * perl-level sighandler, rather than deferring.
3380 * In fact, the core itself will normally use Perl_csighandler as the
3381 * OS-level handler; that function will then decide whether to queue the
3382 * signal or call Perl_sighandler / Perl_perly_sighandler itself. So these
3383 * functions are more useful for e.g. POSIX.xs when it wants explicit
3384 * control of what's happening.
3388 #ifdef PERL_USE_3ARG_SIGHANDLER
3391 Perl_sighandler(int sig, Siginfo_t *sip, void *uap)
3393 Perl_perly_sighandler(sig, sip, uap, 0);
3399 Perl_sighandler(int sig)
3401 Perl_perly_sighandler(sig, NULL, NULL, 0);
3407 Perl_sighandler1(int sig)
3409 Perl_perly_sighandler(sig, NULL, NULL, 0);
3413 Perl_sighandler3(int sig, Siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
3415 Perl_perly_sighandler(sig, sip, uap, 0);
3419 /* Invoke the perl-level signal handler. This function is called either
3420 * directly from one of the C-level signals handlers (Perl_sighandler or
3421 * Perl_csighandler), or for safe signals, later from
3422 * Perl_despatch_signals() at a suitable safe point during execution.
3424 * 'safe' is a boolean indicating the latter call path.
3428 Perl_perly_sighandler(int sig, Siginfo_t *sip PERL_UNUSED_DECL,
3429 void *uap PERL_UNUSED_DECL, bool safe)
3431 #ifdef PERL_GET_SIG_CONTEXT
3432 dTHXa(PERL_GET_SIG_CONTEXT);
3439 SV * const tSv = PL_Sv;
3443 XPV * const tXpv = PL_Xpv;
3444 I32 old_ss_ix = PL_savestack_ix;
3445 SV *errsv_save = NULL;
3448 if (!PL_psig_ptr[sig]) {
3449 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3454 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3455 /* Max number of items pushed there is 3*n or 4. We cannot fix
3456 infinity, so we fix 4 (in fact 5): */
3457 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3459 PL_savestack_ix += 5; /* Protect save in progress. */
3460 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3463 /* sv_2cv is too complicated, try a simpler variant first: */
3464 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3465 || SvTYPE(cv) != SVt_PVCV) {
3467 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3470 if (!cv || !CvROOT(cv)) {
3471 const HEK * const hek = gv
3475 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3477 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3478 "SIG%s handler \"%" HEKf "\" not defined.\n",
3479 PL_sig_name[sig], HEKfARG(hek));
3480 /* diag_listed_as: SIG%s handler "%s" not defined */
3481 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3482 "SIG%s handler \"__ANON__\" not defined.\n",
3487 sv = PL_psig_name[sig]
3488 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3489 : newSVpv(PL_sig_name[sig],0);
3493 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3494 /* make sure our assumption about the size of the SAVEs are correct:
3495 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3496 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3499 PUSHSTACKi(PERLSI_SIGNAL);
3503 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3505 struct sigaction oact;
3507 if (sip && sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3509 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3510 /* The siginfo fields signo, code, errno, pid, uid,
3511 * addr, status, and band are defined by POSIX/SUSv3. */
3512 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3513 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3514 # ifdef HAS_SIGINFO_SI_ERRNO
3515 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3517 # ifdef HAS_SIGINFO_SI_STATUS
3518 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3520 # ifdef HAS_SIGINFO_SI_UID
3523 sv_setuid(uid, sip->si_uid);
3524 (void)hv_stores(sih, "uid", uid);
3527 # ifdef HAS_SIGINFO_SI_PID
3528 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3530 # ifdef HAS_SIGINFO_SI_ADDR
3531 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3533 # ifdef HAS_SIGINFO_SI_BAND
3534 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3538 mPUSHp((char *)sip, sizeof(*sip));
3546 errsv_save = newSVsv(ERRSV);
3548 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3552 SV * const errsv = ERRSV;
3553 if (SvTRUE_NN(errsv)) {
3554 SvREFCNT_dec(errsv_save);
3557 /* Handler "died", for example to get out of a restart-able read().
3558 * Before we re-do that on its behalf re-enable the signal which was
3559 * blocked by the system when we entered.
3561 # ifdef HAS_SIGPROCMASK
3563 /* safe signals called via dispatch_signals() set up a
3564 * savestack destructor, unblock_sigmask(), to
3565 * automatically unblock the handler at the end. If
3566 * instead we get here directly, we have to do it
3571 sigaddset(&set,sig);
3572 sigprocmask(SIG_UNBLOCK, &set, NULL);
3575 /* Not clear if this will work */
3576 /* XXX not clear if this should be protected by 'if (safe)'
3579 (void)rsignal(sig, SIG_IGN);
3580 (void)rsignal(sig, PL_csighandlerp);
3582 #endif /* !PERL_MICRO */
3587 sv_setsv(errsv, errsv_save);
3588 SvREFCNT_dec(errsv_save);
3593 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3594 PL_savestack_ix = old_ss_ix;
3596 SvREFCNT_dec_NN(sv);
3597 PL_op = myop; /* Apparently not needed... */
3599 PL_Sv = tSv; /* Restore global temporaries. */
3606 S_restore_magic(pTHX_ const void *p)
3608 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3609 SV* const sv = mgs->mgs_sv;
3615 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3616 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3618 SvFLAGS(sv) |= mgs->mgs_flags;
3623 bumped = mgs->mgs_bumped;
3624 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3626 /* If we're still on top of the stack, pop us off. (That condition
3627 * will be satisfied if restore_magic was called explicitly, but *not*
3628 * if it's being called via leave_scope.)
3629 * The reason for doing this is that otherwise, things like sv_2cv()
3630 * may leave alloc gunk on the savestack, and some code
3631 * (e.g. sighandler) doesn't expect that...
3633 if (PL_savestack_ix == mgs->mgs_ss_ix)
3635 UV popval = SSPOPUV;
3636 assert(popval == SAVEt_DESTRUCTOR_X);
3637 PL_savestack_ix -= 2;
3639 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3640 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3643 if (SvREFCNT(sv) == 1) {
3644 /* We hold the last reference to this SV, which implies that the
3645 SV was deleted as a side effect of the routines we called.
3646 So artificially keep it alive a bit longer.
3647 We avoid turning on the TEMP flag, which can cause the SV's
3648 buffer to get stolen (and maybe other stuff). */
3653 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3657 /* clean up the mess created by Perl_sighandler().
3658 * Note that this is only called during an exit in a signal handler;
3659 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3663 S_unwind_handler_stack(pTHX_ const void *p)
3667 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3671 =for apidoc_section Magic
3672 =for apidoc magic_sethint
3674 Triggered by a store to C<%^H>, records the key/value pair to
3675 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3676 anything that would need a deep copy. Maybe we should warn if we find a
3682 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3684 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3685 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3687 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3689 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3690 an alternative leaf in there, with PL_compiling.cop_hints being used if
3691 it's NULL. If needed for threads, the alternative could lock a mutex,
3692 or take other more complex action. */
3694 /* Something changed in %^H, so it will need to be restored on scope exit.
3695 Doing this here saves a lot of doing it manually in perl code (and
3696 forgetting to do it, and consequent subtle errors. */
3697 PL_hints |= HINT_LOCALIZE_HH;
3698 CopHINTHASH_set(&PL_compiling,
3699 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3700 magic_sethint_feature(key, NULL, 0, sv, 0);
3705 =for apidoc magic_clearhint
3707 Triggered by a delete from C<%^H>, records the key to
3708 C<PL_compiling.cop_hints_hash>.
3713 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3715 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3716 PERL_UNUSED_ARG(sv);
3718 PL_hints |= HINT_LOCALIZE_HH;
3719 CopHINTHASH_set(&PL_compiling,
3720 mg->mg_len == HEf_SVKEY
3721 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3722 MUTABLE_SV(mg->mg_ptr), 0, 0)
3723 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3724 mg->mg_ptr, mg->mg_len, 0, 0));
3725 if (mg->mg_len == HEf_SVKEY)
3726 magic_sethint_feature(MUTABLE_SV(mg->mg_ptr), NULL, 0, NULL, FALSE);
3728 magic_sethint_feature(NULL, mg->mg_ptr, mg->mg_len, NULL, FALSE);
3733 =for apidoc magic_clearhints
3735 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3740 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3742 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3743 PERL_UNUSED_ARG(sv);
3744 PERL_UNUSED_ARG(mg);
3745 cophh_free(CopHINTHASH_get(&PL_compiling));
3746 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3752 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3753 const char *name, I32 namlen)
3757 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3758 PERL_UNUSED_ARG(sv);
3759 PERL_UNUSED_ARG(name);
3760 PERL_UNUSED_ARG(namlen);
3762 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3763 nmg = mg_find(nsv, mg->mg_type);
3765 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3766 nmg->mg_ptr = mg->mg_ptr;
3767 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3768 nmg->mg_flags |= MGf_REFCOUNTED;
3773 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3774 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3776 #if DBVARMG_SINGLE != 0
3777 assert(mg->mg_private >= DBVARMG_SINGLE);
3779 assert(mg->mg_private < DBVARMG_COUNT);
3781 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3787 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3788 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3790 #if DBVARMG_SINGLE != 0
3791 assert(mg->mg_private >= DBVARMG_SINGLE);
3793 assert(mg->mg_private < DBVARMG_COUNT);
3794 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3800 * ex: set ts=8 sts=4 sw=4 et: