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
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_section Errno
850 =for apidoc sv_string_from_errnum
852 Generates the message string describing an OS error and returns it as
853 an SV. C<errnum> must be a value that C<errno> could take, identifying
856 If C<tgtsv> is non-null then the string will be written into that SV
857 (overwriting existing content) and it will be returned. If C<tgtsv>
858 is a null pointer then the string will be written into a new mortal SV
859 which will be returned.
861 The message will be taken from whatever locale would be used by C<$!>,
862 and will be encoded in the SV in whatever manner would be used by C<$!>.
863 The details of this process are subject to future change. Currently,
864 the message is taken from the C locale by default (usually producing an
865 English message), and from the currently selected locale when in the scope
866 of the C<use locale> pragma. A heuristic attempt is made to decode the
867 message from the locale's character encoding, but it will only be decoded
868 as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
869 locale, usually in an ISO-8859-1 locale, and never in any other locale.
871 The SV is always returned containing an actual string, and with no other
872 OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
873 (meaning success), and if no useful message is available then a useless
874 string (currently empty) is returned.
880 Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
884 tgtsv = sv_newmortal();
885 errstr = my_strerror(errnum);
887 sv_setpv(tgtsv, errstr);
888 fixup_errno_string(tgtsv);
901 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
904 const char *s = NULL;
906 const char * const remaining = mg->mg_ptr + 1;
909 PERL_ARGS_ASSERT_MAGIC_GET;
913 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
915 CALLREG_NUMBUF_FETCH(rx,paren,sv);
922 nextchar = *remaining;
923 switch (*mg->mg_ptr) {
924 case '\001': /* ^A */
925 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
928 if (SvTAINTED(PL_bodytarget))
931 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
932 if (nextchar == '\0') {
933 sv_setiv(sv, (IV)PL_minus_c);
935 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
936 sv_setiv(sv, (IV)STATUS_NATIVE);
940 case '\004': /* ^D */
941 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
943 case '\005': /* ^E */
944 if (nextchar != '\0') {
945 if (strEQ(remaining, "NCODING"))
950 #if defined(VMS) || defined(OS2) || defined(WIN32)
954 $DESCRIPTOR(msgdsc,msg);
955 sv_setnv(sv,(NV) vaxc$errno);
956 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
957 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
962 if (!(_emx_env & 0x200)) { /* Under DOS */
963 sv_setnv(sv, (NV)errno);
964 sv_setpv(sv, errno ? my_strerror(errno) : "");
966 if (errno != errno_isOS2) {
967 const int tmp = _syserrno();
968 if (tmp) /* 2nd call to _syserrno() makes it 0 */
971 sv_setnv(sv, (NV)Perl_rc);
972 sv_setpv(sv, os2error(Perl_rc));
974 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
975 fixup_errno_string(sv);
977 # elif defined(WIN32)
979 const DWORD dwErr = GetLastError();
980 sv_setnv(sv, (NV)dwErr);
982 PerlProc_GetOSError(sv, dwErr);
983 fixup_errno_string(sv);
990 # error Missing code for platform
993 SvNOK_on(sv); /* what a wonderful hack! */
995 #endif /* End of platforms with special handling for $^E; others just fall
1003 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
1005 sv_setnv(sv, (NV)errno);
1008 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1009 sv_setpv(sv, os2error(Perl_rc));
1016 sv_string_from_errnum(errno, sv);
1017 /* If no useful string is available, don't
1018 * claim to have a string part. The SvNOK_on()
1019 * below will cause just the number part to be valid */
1027 SvNOK_on(sv); /* what a wonderful hack! */
1030 case '\006': /* ^F */
1031 if (nextchar == '\0') {
1032 sv_setiv(sv, (IV)PL_maxsysfd);
1035 case '\007': /* ^GLOBAL_PHASE */
1036 if (strEQ(remaining, "LOBAL_PHASE")) {
1037 sv_setpvn(sv, PL_phase_names[PL_phase],
1038 strlen(PL_phase_names[PL_phase]));
1041 case '\010': /* ^H */
1042 sv_setuv(sv, PL_hints);
1044 case '\011': /* ^I */ /* NOT \t in EBCDIC */
1045 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
1047 case '\014': /* ^LAST_FH */
1048 if (strEQ(remaining, "AST_FH")) {
1049 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
1050 assert(isGV_with_GP(PL_last_in_gv));
1051 SV_CHECK_THINKFIRST_COW_DROP(sv);
1052 prepare_SV_for_RV(sv);
1054 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1062 case '\017': /* ^O & ^OPEN */
1063 if (nextchar == '\0') {
1064 sv_setpv(sv, PL_osname);
1067 else if (strEQ(remaining, "PEN")) {
1068 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
1072 sv_setiv(sv, (IV)PL_perldb);
1074 case '\023': /* ^S */
1075 if (nextchar == '\0') {
1076 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
1078 else if (PL_in_eval)
1079 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
1083 else if (strEQ(remaining, "AFE_LOCALES")) {
1085 #if ! defined(USE_ITHREADS) || defined(USE_THREAD_SAFE_LOCALE)
1087 sv_setuv(sv, (UV) 1);
1090 sv_setuv(sv, (UV) 0);
1096 case '\024': /* ^T */
1097 if (nextchar == '\0') {
1099 sv_setnv(sv, PL_basetime);
1101 sv_setiv(sv, (IV)PL_basetime);
1104 else if (strEQ(remaining, "AINT"))
1105 sv_setiv(sv, TAINTING_get
1106 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
1109 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
1110 if (strEQ(remaining, "NICODE"))
1111 sv_setuv(sv, (UV) PL_unicode);
1112 else if (strEQ(remaining, "TF8LOCALE"))
1113 sv_setuv(sv, (UV) PL_utf8locale);
1114 else if (strEQ(remaining, "TF8CACHE"))
1115 sv_setiv(sv, (IV) PL_utf8cache);
1117 case '\027': /* ^W & $^WARNING_BITS */
1118 if (nextchar == '\0')
1119 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
1120 else if (strEQ(remaining, "ARNING_BITS")) {
1121 if (PL_compiling.cop_warnings == pWARN_NONE) {
1122 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
1124 else if (PL_compiling.cop_warnings == pWARN_STD) {
1127 else if (PL_compiling.cop_warnings == pWARN_ALL) {
1128 sv_setpvn(sv, WARN_ALLstring, WARNsize);
1131 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1132 *PL_compiling.cop_warnings);
1136 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1137 sv_setiv(sv, w32_sloppystat);
1142 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1143 paren = RX_LASTPAREN(rx);
1145 goto do_numbuf_fetch;
1148 case '\016': /* ^N */
1149 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
1150 paren = RX_LASTCLOSEPAREN(rx);
1152 goto do_numbuf_fetch;
1156 if (GvIO(PL_last_in_gv)) {
1157 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
1162 sv_setiv(sv, (IV)STATUS_CURRENT);
1163 #ifdef COMPLEX_STATUS
1164 SvUPGRADE(sv, SVt_PVLV);
1165 LvTARGOFF(sv) = PL_statusvalue;
1166 LvTARGLEN(sv) = PL_statusvalue_vms;
1171 if (GvIOp(PL_defoutgv))
1172 s = IoTOP_NAME(GvIOp(PL_defoutgv));
1176 sv_setpv(sv,GvENAME(PL_defoutgv));
1177 sv_catpvs(sv,"_TOP");
1181 if (GvIOp(PL_defoutgv))
1182 s = IoFMT_NAME(GvIOp(PL_defoutgv));
1184 s = GvENAME(PL_defoutgv);
1188 if (GvIO(PL_defoutgv))
1189 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
1192 if (GvIO(PL_defoutgv))
1193 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
1196 if (GvIO(PL_defoutgv))
1197 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
1206 if (GvIO(PL_defoutgv))
1207 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
1211 sv_copypv(sv, PL_ors_sv);
1217 IV const pid = (IV)PerlProc_getpid();
1218 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
1219 /* never set manually, or at least not since last fork */
1221 /* never unsafe, even if reading in a tainted expression */
1224 /* else a value has been assigned manually, so do nothing */
1228 sv_setuid(sv, PerlProc_getuid());
1231 sv_setuid(sv, PerlProc_geteuid());
1234 sv_setgid(sv, PerlProc_getgid());
1237 sv_setgid(sv, PerlProc_getegid());
1239 #ifdef HAS_GETGROUPS
1241 Groups_t *gary = NULL;
1242 I32 num_groups = getgroups(0, gary);
1243 if (num_groups > 0) {
1245 Newx(gary, num_groups, Groups_t);
1246 num_groups = getgroups(num_groups, gary);
1247 for (i = 0; i < num_groups; i++)
1248 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
1252 (void)SvIOK_on(sv); /* what a wonderful hack! */
1266 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
1268 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
1270 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1272 if (uf && uf->uf_val)
1273 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
1278 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
1280 STRLEN len = 0, klen;
1281 const char * const key = MgPV_const(mg,klen);
1284 PERL_ARGS_ASSERT_MAGIC_SETENV;
1288 /* defined environment variables are byte strings; unfortunately
1289 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1290 (void)SvPV_force_nomg_nolen(sv);
1291 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1293 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1299 my_setenv(key, s); /* does the deed */
1301 #ifdef DYNAMIC_ENV_FETCH
1302 /* We just undefd an environment var. Is a replacement */
1303 /* waiting in the wings? */
1305 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
1307 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
1311 #if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
1312 /* And you'll never guess what the dog had */
1313 /* in its mouth... */
1315 MgTAINTEDDIR_off(mg);
1317 if (s && memEQs(key, klen, "DCL$PATH")) {
1318 char pathbuf[256], eltbuf[256], *cp, *elt;
1321 my_strlcpy(eltbuf, s, sizeof(eltbuf));
1323 do { /* DCL$PATH may be a search list */
1324 while (1) { /* as may dev portion of any element */
1325 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1326 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1327 cando_by_name(S_IWUSR,0,elt) ) {
1328 MgTAINTEDDIR_on(mg);
1332 if ((cp = strchr(elt, ':')) != NULL)
1334 if (my_trnlnm(elt, eltbuf, j++))
1340 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1343 if (s && memEQs(key, klen, "PATH")) {
1344 const char * const strend = s + len;
1346 /* set MGf_TAINTEDDIR if any component of the new path is
1347 * relative or world-writeable */
1348 while (s < strend) {
1352 #ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1353 const char path_sep = PL_perllib_sep;
1355 const char path_sep = ':';
1357 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
1358 s, strend, path_sep, &i);
1360 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
1362 /* no colon thus no device name -- assume relative path */
1363 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1364 /* Using Unix separator, e.g. under bash, so act line Unix */
1365 || (PL_perllib_sep == ':' && *tmpbuf != '/')
1367 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1369 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1370 MgTAINTEDDIR_on(mg);
1376 #endif /* neither OS2 nor WIN32 nor MSDOS */
1382 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1384 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
1385 PERL_UNUSED_ARG(sv);
1386 my_setenv(MgPV_nolen_const(mg),NULL);
1391 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1393 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
1394 PERL_UNUSED_ARG(mg);
1396 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1398 if (PL_localizing) {
1401 hv_iterinit(MUTABLE_HV(sv));
1402 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
1404 my_setenv(hv_iterkey(entry, &keylen),
1405 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
1413 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1415 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
1416 PERL_UNUSED_ARG(sv);
1417 PERL_UNUSED_ARG(mg);
1419 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1427 #ifdef HAS_SIGPROCMASK
1429 restore_sigmask(pTHX_ SV *save_sv)
1431 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1432 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
1436 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1438 /* Are we fetching a signal entry? */
1439 int i = (I16)mg->mg_private;
1441 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1445 const char * sig = MgPV_const(mg, siglen);
1446 mg->mg_private = i = whichsig_pvn(sig, siglen);
1451 sv_setsv(sv,PL_psig_ptr[i]);
1453 Sighandler_t sigstate = rsignal_state(i);
1454 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1455 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1458 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1459 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1462 /* cache state so we don't fetch it again */
1463 if(sigstate == (Sighandler_t) SIG_IGN)
1464 sv_setpvs(sv,"IGNORE");
1467 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1474 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1476 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
1478 magic_setsig(NULL, mg);
1479 return sv_unmagic(sv, mg->mg_type);
1483 #ifdef PERL_USE_3ARG_SIGHANDLER
1485 Perl_csighandler(int sig, Siginfo_t *sip, void *uap)
1487 Perl_csighandler3(sig, sip, uap);
1491 Perl_csighandler(int sig)
1493 Perl_csighandler3(sig, NULL, NULL);
1498 Perl_csighandler1(int sig)
1500 Perl_csighandler3(sig, NULL, NULL);
1503 /* Handler intended to directly handle signal calls from the kernel.
1504 * (Depending on configuration, the kernel may actually call one of the
1505 * wrappers csighandler() or csighandler1() instead.)
1506 * It either queues up the signal or dispatches it immediately depending
1507 * on whether safe signals are enabled and whether the signal is capable
1508 * of being deferred (e.g. SEGV isn't).
1512 Perl_csighandler3(int sig, Siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
1514 #ifdef PERL_GET_SIG_CONTEXT
1515 dTHXa(PERL_GET_SIG_CONTEXT);
1520 #ifdef PERL_USE_3ARG_SIGHANDLER
1521 #if defined(__cplusplus) && defined(__GNUC__)
1522 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1523 * parameters would be warned about. */
1524 PERL_UNUSED_ARG(sip);
1525 PERL_UNUSED_ARG(uap);
1529 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1530 (void) rsignal(sig, PL_csighandlerp);
1531 if (PL_sig_ignoring[sig]) return;
1533 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1534 if (PL_sig_defaulting[sig])
1535 #ifdef KILL_BY_SIGPRC
1536 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1551 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
1552 /* Call the perl level handler now--
1553 * with risk we may be in malloc() or being destructed etc. */
1555 if (PL_sighandlerp == Perl_sighandler)
1556 /* default handler, so can call perly_sighandler() directly
1557 * rather than via Perl_sighandler, passing the extra
1558 * 'safe = false' arg
1560 Perl_perly_sighandler(sig, NULL, NULL, 0 /* unsafe */);
1562 #ifdef PERL_USE_3ARG_SIGHANDLER
1563 (*PL_sighandlerp)(sig, NULL, NULL);
1565 (*PL_sighandlerp)(sig);
1569 if (!PL_psig_pend) return;
1570 /* Set a flag to say this signal is pending, that is awaiting delivery after
1571 * the current Perl opcode completes */
1572 PL_psig_pend[sig]++;
1574 #ifndef SIG_PENDING_DIE_COUNT
1575 # define SIG_PENDING_DIE_COUNT 120
1577 /* Add one to say _a_ signal is pending */
1578 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1579 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1580 (unsigned long)SIG_PENDING_DIE_COUNT);
1584 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1586 Perl_csighandler_init(void)
1589 if (PL_sig_handlers_initted) return;
1591 for (sig = 1; sig < SIG_SIZE; sig++) {
1592 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1594 PL_sig_defaulting[sig] = 1;
1595 (void) rsignal(sig, PL_csighandlerp);
1597 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1598 PL_sig_ignoring[sig] = 0;
1601 PL_sig_handlers_initted = 1;
1605 #if defined HAS_SIGPROCMASK
1607 unblock_sigmask(pTHX_ void* newset)
1609 PERL_UNUSED_CONTEXT;
1610 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1615 Perl_despatch_signals(pTHX)
1619 for (sig = 1; sig < SIG_SIZE; sig++) {
1620 if (PL_psig_pend[sig]) {
1622 #ifdef HAS_SIGPROCMASK
1623 /* From sigaction(2) (FreeBSD man page):
1624 * | Signal routines normally execute with the signal that
1625 * | caused their invocation blocked, but other signals may
1627 * Emulation of this behavior (from within Perl) is enabled
1631 sigset_t newset, oldset;
1633 sigemptyset(&newset);
1634 sigaddset(&newset, sig);
1635 sigprocmask(SIG_BLOCK, &newset, &oldset);
1636 was_blocked = sigismember(&oldset, sig);
1638 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1640 SAVEFREESV(save_sv);
1641 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1644 PL_psig_pend[sig] = 0;
1645 if (PL_sighandlerp == Perl_sighandler)
1646 /* default handler, so can call perly_sighandler() directly
1647 * rather than via Perl_sighandler, passing the extra
1650 Perl_perly_sighandler(sig, NULL, NULL, 1 /* safe */);
1652 #ifdef PERL_USE_3ARG_SIGHANDLER
1653 (*PL_sighandlerp)(sig, NULL, NULL);
1655 (*PL_sighandlerp)(sig);
1658 #ifdef HAS_SIGPROCMASK
1667 /* sv of NULL signifies that we're acting as magic_clearsig. */
1669 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 const char* name = PL_sig_name[i];
1757 PL_psig_name[i] = newSVpvn(name, strlen(name));
1758 SvREADONLY_on(PL_psig_name[i]);
1761 SvREFCNT_dec(PL_psig_name[i]);
1762 PL_psig_name[i] = NULL;
1763 PL_psig_ptr[i] = NULL;
1766 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
1768 (void)rsignal(i, PL_csighandlerp);
1771 *svp = SvREFCNT_inc_simple_NN(sv);
1773 if (sv && SvOK(sv)) {
1774 s = SvPV_force(sv, len);
1778 if (sv && memEQs(s, len,"IGNORE")) {
1780 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1781 PL_sig_ignoring[i] = 1;
1782 (void)rsignal(i, PL_csighandlerp);
1784 (void)rsignal(i, (Sighandler_t) SIG_IGN);
1788 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
1790 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1791 PL_sig_defaulting[i] = 1;
1792 (void)rsignal(i, PL_csighandlerp);
1794 (void)rsignal(i, (Sighandler_t) SIG_DFL);
1800 * We should warn if HINT_STRICT_REFS, but without
1801 * access to a known hint bit in a known OP, we can't
1802 * tell whether HINT_STRICT_REFS is in force or not.
1804 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
1805 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1808 (void)rsignal(i, PL_csighandlerp);
1810 *svp = SvREFCNT_inc_simple_NN(sv);
1814 #ifdef HAS_SIGPROCMASK
1818 SvREFCNT_dec(to_dec);
1821 #endif /* !PERL_MICRO */
1824 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1826 PERL_ARGS_ASSERT_MAGIC_SETISA;
1827 PERL_UNUSED_ARG(sv);
1829 /* Skip _isaelem because _isa will handle it shortly */
1830 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
1833 return magic_clearisa(NULL, mg);
1836 /* sv of NULL signifies that we're acting as magic_setisa. */
1838 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1841 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1843 /* Bail out if destruction is going on */
1844 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
1847 av_clear(MUTABLE_AV(sv));
1849 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1850 /* This occurs with setisa_elem magic, which calls this
1852 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1855 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1856 SV **svp = AvARRAY((AV *)mg->mg_obj);
1857 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1859 stash = GvSTASH((GV *)*svp++);
1860 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1867 (const GV *)mg->mg_obj
1870 /* The stash may have been detached from the symbol table, so check its
1871 name before doing anything. */
1872 if (stash && HvENAME_get(stash))
1873 mro_isa_changed_in(stash);
1879 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1881 HV * const hv = MUTABLE_HV(LvTARG(sv));
1884 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
1885 PERL_UNUSED_ARG(mg);
1888 (void) hv_iterinit(hv);
1889 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1892 while (hv_iternext(hv))
1897 sv_setiv(sv, (IV)i);
1902 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1904 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
1905 PERL_UNUSED_ARG(mg);
1907 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
1913 =for apidoc_section Magic
1914 =for apidoc magic_methcall
1916 Invoke a magic method (like FETCH).
1918 C<sv> and C<mg> are the tied thingy and the tie magic.
1920 C<meth> is the name of the method to call.
1922 C<argc> is the number of args (in addition to $self) to pass to the method.
1924 The C<flags> can be:
1926 G_DISCARD invoke method with G_DISCARD flag and don't
1928 G_UNDEF_FILL fill the stack with argc pointers to
1931 The arguments themselves are any values following the C<flags> argument.
1933 Returns the SV (if any) returned by the method, or C<NULL> on failure.
1940 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
1946 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1950 if (flags & G_WRITING_TO_STDERR) {
1954 SAVESPTR(PL_stderrgv);
1958 PUSHSTACKi(PERLSI_MAGIC);
1961 /* EXTEND() expects a signed argc; don't wrap when casting */
1962 assert(argc <= I32_MAX);
1963 EXTEND(SP, (I32)argc+1);
1964 PUSHs(SvTIED_obj(sv, mg));
1965 if (flags & G_UNDEF_FILL) {
1967 PUSHs(&PL_sv_undef);
1969 } else if (argc > 0) {
1971 va_start(args, argc);
1974 SV *const this_sv = va_arg(args, SV *);
1981 if (flags & G_DISCARD) {
1982 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
1985 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
1986 ret = *PL_stack_sp--;
1989 if (flags & G_WRITING_TO_STDERR)
1995 /* wrapper for magic_methcall that creates the first arg */
1998 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
2003 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
2006 if (mg->mg_len >= 0) {
2007 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
2009 else if (mg->mg_len == HEf_SVKEY)
2010 arg1 = MUTABLE_SV(mg->mg_ptr);
2012 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
2013 arg1 = newSViv((IV)(mg->mg_len));
2017 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
2019 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
2023 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
2027 PERL_ARGS_ASSERT_MAGIC_METHPACK;
2029 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
2036 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
2038 PERL_ARGS_ASSERT_MAGIC_GETPACK;
2040 if (mg->mg_type == PERL_MAGIC_tiedelem)
2041 mg->mg_flags |= MGf_GSKIP;
2042 magic_methpack(sv,mg,SV_CONST(FETCH));
2047 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
2052 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2054 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2055 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2056 * public flags indicate its value based on copying from $val. Doing
2057 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2058 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2059 * wrong if $val happened to be tainted, as sv hasn't got magic
2060 * enabled, even though taint magic is in the chain. In which case,
2061 * fake up a temporary tainted value (this is easier than temporarily
2062 * re-enabling magic on sv). */
2064 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
2065 && (tmg->mg_len & 1))
2067 val = sv_mortalcopy(sv);
2073 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
2078 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
2080 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2082 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
2083 return magic_methpack(sv,mg,SV_CONST(DELETE));
2088 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
2093 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2095 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
2097 retval = SvIV(retsv)-1;
2099 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
2101 return (U32) retval;
2105 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
2107 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2109 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
2114 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
2118 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2120 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2121 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
2128 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
2130 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2132 return magic_methpack(sv,mg,SV_CONST(EXISTS));
2136 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2139 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2140 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
2142 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2144 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2146 if (HvEITER_get(hv))
2147 /* we are in an iteration so the hash cannot be empty */
2149 /* no xhv_eiter so now use FIRSTKEY */
2150 key = sv_newmortal();
2151 magic_nextpack(MUTABLE_SV(hv), mg, key);
2152 HvEITER_set(hv, NULL); /* need to reset iterator */
2153 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2156 /* there is a SCALAR method that we can call */
2157 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
2159 retval = &PL_sv_undef;
2164 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
2168 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2170 /* The magic ptr/len for the debugger's hash should always be an SV. */
2171 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2172 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
2173 (IV)mg->mg_len, mg->mg_ptr);
2176 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2177 setting/clearing debugger breakpoints is not a hot path. */
2178 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2179 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
2181 if (svp && SvIOKp(*svp)) {
2182 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2184 #ifdef PERL_DEBUG_READONLY_OPS
2185 Slab_to_rw(OpSLAB(o));
2187 /* set or clear breakpoint in the relevant control op */
2189 o->op_flags |= OPf_SPECIAL;
2191 o->op_flags &= ~OPf_SPECIAL;
2192 #ifdef PERL_DEBUG_READONLY_OPS
2193 Slab_to_ro(OpSLAB(o));
2201 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
2203 AV * const obj = MUTABLE_AV(mg->mg_obj);
2205 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2208 sv_setiv(sv, AvFILL(obj));
2216 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
2218 AV * const obj = MUTABLE_AV(mg->mg_obj);
2220 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2223 av_fill(obj, SvIV(sv));
2225 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2226 "Attempt to set length of freed array");
2232 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2234 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2235 PERL_UNUSED_ARG(sv);
2236 PERL_UNUSED_CONTEXT;
2238 /* Reset the iterator when the array is cleared */
2239 if (sizeof(IV) == sizeof(SSize_t)) {
2240 *((IV *) &(mg->mg_len)) = 0;
2243 *((IV *) mg->mg_ptr) = 0;
2250 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2252 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
2253 PERL_UNUSED_ARG(sv);
2255 /* during global destruction, mg_obj may already have been freed */
2256 if (PL_in_clean_all)
2259 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2262 /* arylen scalar holds a pointer back to the array, but doesn't own a
2263 reference. Hence the we (the array) are about to go away with it
2264 still pointing at us. Clear its pointer, else it would be pointing
2265 at free memory. See the comment in sv_magic about reference loops,
2266 and why it can't own a reference to us. */
2273 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
2275 SV* const lsv = LvTARG(sv);
2276 MAGIC * const found = mg_find_mglob(lsv);
2278 PERL_ARGS_ASSERT_MAGIC_GETPOS;
2279 PERL_UNUSED_ARG(mg);
2281 if (found && found->mg_len != -1) {
2282 STRLEN i = found->mg_len;
2283 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
2284 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2293 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
2295 SV* const lsv = LvTARG(sv);
2301 PERL_ARGS_ASSERT_MAGIC_SETPOS;
2302 PERL_UNUSED_ARG(mg);
2304 found = mg_find_mglob(lsv);
2308 found = sv_magicext_mglob(lsv);
2310 else if (!SvOK(sv)) {
2314 s = SvPV_const(lsv, len);
2319 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
2329 else if (pos > (SSize_t)len)
2332 found->mg_len = pos;
2333 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
2339 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
2342 SV * const lsv = LvTARG(sv);
2343 const char * const tmps = SvPV_const(lsv,len);
2344 STRLEN offs = LvTARGOFF(sv);
2345 STRLEN rem = LvTARGLEN(sv);
2346 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2347 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
2349 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
2350 PERL_UNUSED_ARG(mg);
2352 if (!translate_substr_offsets(
2353 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
2354 negoff ? -(IV)offs : (IV)offs, !negoff,
2355 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2357 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2363 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
2364 sv_setpvn(sv, tmps + offs, rem);
2371 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
2373 STRLEN len, lsv_len, oldtarglen, newtarglen;
2374 const char * const tmps = SvPV_const(sv, len);
2375 SV * const lsv = LvTARG(sv);
2376 STRLEN lvoff = LvTARGOFF(sv);
2377 STRLEN lvlen = LvTARGLEN(sv);
2378 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2379 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
2381 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
2382 PERL_UNUSED_ARG(mg);
2386 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2387 "Attempt to use reference as lvalue in substr"
2389 SvPV_force_nomg(lsv,lsv_len);
2390 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
2391 if (!translate_substr_offsets(
2393 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2394 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2396 Perl_croak(aTHX_ "substr outside of string");
2399 sv_utf8_upgrade_nomg(lsv);
2400 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2401 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2402 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
2405 else if (SvUTF8(lsv)) {
2407 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
2409 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2410 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
2414 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
2417 if (!neglen) LvTARGLEN(sv) = newtarglen;
2418 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
2424 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
2426 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
2427 PERL_UNUSED_ARG(sv);
2428 #ifdef NO_TAINT_SUPPORT
2429 PERL_UNUSED_ARG(mg);
2432 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
2437 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
2439 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
2440 PERL_UNUSED_ARG(sv);
2442 /* update taint status */
2451 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
2453 SV * const lsv = LvTARG(sv);
2454 char errflags = LvFLAGS(sv);
2456 PERL_ARGS_ASSERT_MAGIC_GETVEC;
2457 PERL_UNUSED_ARG(mg);
2459 /* non-zero errflags implies deferred out-of-range condition */
2460 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
2461 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2467 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
2469 PERL_ARGS_ASSERT_MAGIC_SETVEC;
2470 PERL_UNUSED_ARG(mg);
2471 do_vecset(sv); /* XXX slurp this routine */
2476 Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
2479 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2480 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2482 if (LvTARGLEN(sv)) {
2484 SV * const ahv = LvTARG(sv);
2485 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
2489 else if (LvSTARGOFF(sv) >= 0) {
2490 AV *const av = MUTABLE_AV(LvTARG(sv));
2491 if (LvSTARGOFF(sv) <= AvFILL(av))
2493 if (SvRMAGICAL(av)) {
2494 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2495 targ = svp ? *svp : NULL;
2498 targ = AvARRAY(av)[LvSTARGOFF(sv)];
2501 if (targ && (targ != &PL_sv_undef)) {
2502 /* somebody else defined it for us */
2503 SvREFCNT_dec(LvTARG(sv));
2504 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
2506 SvREFCNT_dec(mg->mg_obj);
2508 mg->mg_flags &= ~MGf_REFCOUNTED;
2517 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2519 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2521 sv_setsv(sv, defelem_target(sv, mg));
2526 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
2528 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
2529 PERL_UNUSED_ARG(mg);
2533 sv_setsv(LvTARG(sv), sv);
2534 SvSETMAGIC(LvTARG(sv));
2540 Perl_vivify_defelem(pTHX_ SV *sv)
2545 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2547 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
2550 SV * const ahv = LvTARG(sv);
2551 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
2554 if (!value || value == &PL_sv_undef)
2555 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
2557 else if (LvSTARGOFF(sv) < 0)
2558 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2560 AV *const av = MUTABLE_AV(LvTARG(sv));
2561 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
2562 LvTARG(sv) = NULL; /* array can't be extended */
2564 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
2565 if (!svp || !(value = *svp))
2566 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
2569 SvREFCNT_inc_simple_void(value);
2570 SvREFCNT_dec(LvTARG(sv));
2573 SvREFCNT_dec(mg->mg_obj);
2575 mg->mg_flags &= ~MGf_REFCOUNTED;
2579 Perl_magic_setnonelem(pTHX_ SV *sv, MAGIC *mg)
2581 PERL_ARGS_ASSERT_MAGIC_SETNONELEM;
2582 PERL_UNUSED_ARG(mg);
2583 sv_unmagic(sv, PERL_MAGIC_nonelem);
2588 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
2590 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
2591 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2596 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2598 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
2599 PERL_UNUSED_CONTEXT;
2600 PERL_UNUSED_ARG(sv);
2606 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2608 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2610 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2612 if (uf && uf->uf_set)
2613 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2618 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2620 const char type = mg->mg_type;
2622 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2624 assert( type == PERL_MAGIC_fm
2625 || type == PERL_MAGIC_qr
2626 || type == PERL_MAGIC_bm);
2627 return sv_unmagic(sv, type);
2630 #ifdef USE_LOCALE_COLLATE
2632 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2634 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2637 * RenE<eacute> Descartes said "I think not."
2638 * and vanished with a faint plop.
2640 PERL_UNUSED_CONTEXT;
2641 PERL_UNUSED_ARG(sv);
2643 Safefree(mg->mg_ptr);
2649 #endif /* USE_LOCALE_COLLATE */
2651 /* Just clear the UTF-8 cache data. */
2653 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2655 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
2656 PERL_UNUSED_CONTEXT;
2657 PERL_UNUSED_ARG(sv);
2658 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2660 mg->mg_len = -1; /* The mg_len holds the len cache. */
2665 Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2667 const char *bad = NULL;
2668 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
2669 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
2670 switch (mg->mg_private & OPpLVREF_TYPE) {
2672 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2676 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2680 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2684 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2688 /* diag_listed_as: Assigned value is not %s reference */
2689 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
2690 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2693 SV * const old = PAD_SV(mg->mg_len);
2694 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2699 gv_setref(mg->mg_obj, sv);
2700 SvSETMAGIC(mg->mg_obj);
2703 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2704 SvREFCNT_inc_simple_NN(SvRV(sv)));
2707 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2708 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
2710 if (mg->mg_flags & MGf_PERSIST)
2711 NOOP; /* This sv is in use as an iterator var and will be reused,
2712 so we must leave the magic. */
2714 /* This sv could be returned by the assignment op, so clear the
2715 magic, as lvrefs are an implementation detail that must not be
2716 leaked to the user. */
2717 sv_unmagic(sv, PERL_MAGIC_lvref);
2722 S_set_dollarzero(pTHX_ SV *sv)
2723 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2729 #ifdef HAS_SETPROCTITLE
2730 /* The BSDs don't show the argv[] in ps(1) output, they
2731 * show a string from the process struct and provide
2732 * the setproctitle() routine to manipulate that. */
2733 if (PL_origalen != 1) {
2734 s = SvPV_const(sv, len);
2735 # if __FreeBSD_version > 410001 || defined(__DragonFly__)
2736 /* The leading "-" removes the "perl: " prefix,
2737 * but not the "(perl) suffix from the ps(1)
2738 * output, because that's what ps(1) shows if the
2739 * argv[] is modified. */
2740 setproctitle("-%s", s);
2741 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2742 /* This doesn't really work if you assume that
2743 * $0 = 'foobar'; will wipe out 'perl' from the $0
2744 * because in ps(1) output the result will be like
2745 * sprintf("perl: %s (perl)", s)
2746 * I guess this is a security feature:
2747 * one (a user process) cannot get rid of the original name.
2749 setproctitle("%s", s);
2752 #elif defined(__hpux) && defined(PSTAT_SETCMD)
2753 if (PL_origalen != 1) {
2755 s = SvPV_const(sv, len);
2756 un.pst_command = (char *)s;
2757 pstat(PSTAT_SETCMD, un, len, 0, 0);
2760 if (PL_origalen > 1) {
2762 /* PL_origalen is set in perl_parse(). */
2763 s = SvPV_force(sv,len);
2764 if (len >= (STRLEN)PL_origalen-1) {
2765 /* Longer than original, will be truncated. We assume that
2766 * PL_origalen bytes are available. */
2767 Copy(s, PL_origargv[0], PL_origalen-1, char);
2770 /* Shorter than original, will be padded. */
2772 /* Special case for Mac OS X: see [perl #38868] */
2775 /* Is the space counterintuitive? Yes.
2776 * (You were expecting \0?)
2777 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2779 const int pad = ' ';
2781 Copy(s, PL_origargv[0], len, char);
2782 PL_origargv[0][len] = 0;
2783 memset(PL_origargv[0] + len + 1,
2784 pad, PL_origalen - len - 1);
2786 PL_origargv[0][PL_origalen-1] = 0;
2787 for (i = 1; i < PL_origargc; i++)
2789 #ifdef HAS_PRCTL_SET_NAME
2790 /* Set the legacy process name in addition to the POSIX name on Linux */
2791 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2792 /* diag_listed_as: SKIPME */
2793 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2801 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 free_and_set_cop_warnings(&PL_compiling, pWARN_STD);
2973 int not_none = 0, not_all = 0;
2974 const U8 * const ptr = (const U8 *)SvPV_const(sv, len) ;
2975 for (i = 0 ; i < len ; ++i) {
2977 not_all |= ptr[i] ^ 0x55;
2980 free_and_set_cop_warnings(&PL_compiling, pWARN_NONE);
2981 } else if (len >= WARNsize && !not_all) {
2982 free_and_set_cop_warnings(&PL_compiling, pWARN_ALL);
2983 PL_dowarn |= G_WARN_ONCE ;
2987 const char *const p = SvPV_const(sv, len);
2989 PL_compiling.cop_warnings
2990 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
2993 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2994 PL_dowarn |= G_WARN_ONCE ;
3001 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
3002 w32_sloppystat = (bool)sv_true(sv);
3007 if (PL_localizing) {
3008 if (PL_localizing == 1)
3009 SAVESPTR(PL_last_in_gv);
3011 else if (SvOK(sv) && GvIO(PL_last_in_gv))
3012 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
3015 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
3016 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
3017 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
3020 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
3021 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
3022 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
3025 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
3028 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3029 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
3030 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
3033 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
3037 IO * const io = GvIO(PL_defoutgv);
3040 if ((SvIV(sv)) == 0)
3041 IoFLAGS(io) &= ~IOf_FLUSH;
3043 if (!(IoFLAGS(io) & IOf_FLUSH)) {
3044 PerlIO *ofp = IoOFP(io);
3046 (void)PerlIO_flush(ofp);
3047 IoFLAGS(io) |= IOf_FLUSH;
3055 SV *referent = SvRV(sv);
3056 const char *reftype = sv_reftype(referent, 0);
3057 /* XXX: dodgy type check: This leaves me feeling dirty, but
3058 * the alternative is to copy pretty much the entire
3059 * sv_reftype() into this routine, or to do a full string
3060 * comparison on the return of sv_reftype() both of which
3061 * make me feel worse! NOTE, do not modify this comment
3062 * without reviewing the corresponding comment in
3063 * sv_reftype(). - Yves */
3064 if (reftype[0] == 'S' || reftype[0] == 'L') {
3065 IV val = SvIV(referent);
3067 sv_setsv(sv, PL_rs);
3068 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3069 val < 0 ? "a negative integer" : "zero");
3072 sv_setsv(sv, PL_rs);
3073 /* diag_listed_as: Setting $/ to %s reference is forbidden */
3074 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3075 *reftype == 'A' ? "n" : "", reftype);
3078 SvREFCNT_dec(PL_rs);
3079 PL_rs = newSVsv(sv);
3083 SvREFCNT_dec(PL_ors_sv);
3085 PL_ors_sv = newSVsv(sv);
3093 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3096 #ifdef COMPLEX_STATUS
3097 if (PL_localizing == 2) {
3098 SvUPGRADE(sv, SVt_PVLV);
3099 PL_statusvalue = LvTARGOFF(sv);
3100 PL_statusvalue_vms = LvTARGLEN(sv);
3104 #ifdef VMSISH_STATUS
3106 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
3109 STATUS_UNIX_EXIT_SET(SvIV(sv));
3114 # define PERL_VMS_BANG vaxc$errno
3116 # define PERL_VMS_BANG 0
3119 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3120 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3122 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
3123 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3129 /* XXX $< currently silently ignores failures */
3130 const Uid_t new_uid = SvUID(sv);
3131 PL_delaymagic_uid = new_uid;
3132 if (PL_delaymagic) {
3133 PL_delaymagic |= DM_RUID;
3134 break; /* don't do magic till later */
3137 PERL_UNUSED_RESULT(setruid(new_uid));
3138 #elif defined(HAS_SETREUID)
3139 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
3140 #elif defined(HAS_SETRESUID)
3141 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
3143 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
3145 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
3146 if (new_uid != 0 && PerlProc_getuid() == 0)
3147 PERL_UNUSED_RESULT(PerlProc_setuid(0));
3149 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
3151 Perl_croak(aTHX_ "setruid() not implemented");
3158 /* XXX $> currently silently ignores failures */
3159 const Uid_t new_euid = SvUID(sv);
3160 PL_delaymagic_euid = new_euid;
3161 if (PL_delaymagic) {
3162 PL_delaymagic |= DM_EUID;
3163 break; /* don't do magic till later */
3166 PERL_UNUSED_RESULT(seteuid(new_euid));
3167 #elif defined(HAS_SETREUID)
3168 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
3169 #elif defined(HAS_SETRESUID)
3170 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
3172 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
3173 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
3175 Perl_croak(aTHX_ "seteuid() not implemented");
3182 /* XXX $( currently silently ignores failures */
3183 const Gid_t new_gid = SvGID(sv);
3184 PL_delaymagic_gid = new_gid;
3185 if (PL_delaymagic) {
3186 PL_delaymagic |= DM_RGID;
3187 break; /* don't do magic till later */
3190 PERL_UNUSED_RESULT(setrgid(new_gid));
3191 #elif defined(HAS_SETREGID)
3192 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
3193 #elif defined(HAS_SETRESGID)
3194 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
3196 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
3197 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
3199 Perl_croak(aTHX_ "setrgid() not implemented");
3206 /* (hv) best guess: maybe we'll need configure probes to do a better job,
3207 * but you can override it if you need to.
3210 #define INVALID_GID ((Gid_t)-1)
3212 /* XXX $) currently silently ignores failures */
3214 #ifdef HAS_SETGROUPS
3216 const char *p = SvPV_const(sv, len);
3217 Groups_t *gary = NULL;
3218 const char* p_end = p + len;
3219 const char* endptr = p_end;
3221 #ifdef _SC_NGROUPS_MAX
3222 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3227 int maxgrp = NGROUPS;
3232 if (grok_atoUV(p, &uv, &endptr))
3233 new_egid = (Gid_t)uv;
3235 new_egid = INVALID_GID;
3238 for (i = 0; i < maxgrp; ++i) {
3248 Newx(gary, i + 1, Groups_t);
3250 Renew(gary, i + 1, Groups_t);
3251 if (grok_atoUV(p, &uv, &endptr))
3252 gary[i] = (Groups_t)uv;
3254 gary[i] = INVALID_GID;
3259 PERL_UNUSED_RESULT(setgroups(i, gary));
3262 #else /* HAS_SETGROUPS */
3263 new_egid = SvGID(sv);
3264 #endif /* HAS_SETGROUPS */
3265 PL_delaymagic_egid = new_egid;
3266 if (PL_delaymagic) {
3267 PL_delaymagic |= DM_EGID;
3268 break; /* don't do magic till later */
3271 PERL_UNUSED_RESULT(setegid(new_egid));
3272 #elif defined(HAS_SETREGID)
3273 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
3274 #elif defined(HAS_SETRESGID)
3275 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
3277 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
3278 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
3280 Perl_croak(aTHX_ "setegid() not implemented");
3286 PL_chopset = SvPV_force(sv,len);
3289 /* Store the pid in mg->mg_obj so we can tell when a fork has
3290 occurred. mg->mg_obj points to *$ by default, so clear it. */
3291 if (isGV(mg->mg_obj)) {
3292 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3293 SvREFCNT_dec(mg->mg_obj);
3294 mg->mg_flags |= MGf_REFCOUNTED;
3295 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3297 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3300 LOCK_DOLLARZERO_MUTEX;
3301 S_set_dollarzero(aTHX_ sv);
3302 UNLOCK_DOLLARZERO_MUTEX;
3309 =for apidoc_section Signals
3310 =for apidoc whichsig
3311 =for apidoc_item whichsig_pv
3312 =for apidoc_item whichsig_pvn
3313 =for apidoc_item whichsig_sv
3315 These all convert a signal name into its corresponding signal number;
3316 returning -1 if no corresponding number was found.
3318 They differ only in the source of the signal name:
3320 C<whichsig_pv> takes the name from the C<NUL>-terminated string starting at
3323 C<whichsig> is merely a different spelling, a synonym, of C<whichsig_pv>.
3325 C<whichsig_pvn> takes the name from the string starting at C<sig>, with length
3328 C<whichsig_sv> takes the name from the PV stored in the SV C<sigsv>.
3334 Perl_whichsig_sv(pTHX_ SV *sigsv)
3338 PERL_ARGS_ASSERT_WHICHSIG_SV;
3339 sigpv = SvPV_const(sigsv, siglen);
3340 return whichsig_pvn(sigpv, siglen);
3344 Perl_whichsig_pv(pTHX_ const char *sig)
3346 PERL_ARGS_ASSERT_WHICHSIG_PV;
3347 return whichsig_pvn(sig, strlen(sig));
3351 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
3355 PERL_ARGS_ASSERT_WHICHSIG_PVN;
3356 PERL_UNUSED_CONTEXT;
3358 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
3359 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
3360 return PL_sig_num[sigv - (char* const*)PL_sig_name];
3362 if (memEQs(sig, len, "CHLD"))
3366 if (memEQs(sig, len, "CLD"))
3373 /* Perl_sighandler(), Perl_sighandler1(), Perl_sighandler3():
3374 * these three function are intended to be called by the OS as 'C' level
3375 * signal handler functions in the case where unsafe signals are being
3376 * used - i.e. they immediately invoke Perl_perly_sighandler() to call the
3377 * perl-level sighandler, rather than deferring.
3378 * In fact, the core itself will normally use Perl_csighandler as the
3379 * OS-level handler; that function will then decide whether to queue the
3380 * signal or call Perl_sighandler / Perl_perly_sighandler itself. So these
3381 * functions are more useful for e.g. POSIX.xs when it wants explicit
3382 * control of what's happening.
3386 #ifdef PERL_USE_3ARG_SIGHANDLER
3389 Perl_sighandler(int sig, Siginfo_t *sip, void *uap)
3391 Perl_perly_sighandler(sig, sip, uap, 0);
3397 Perl_sighandler(int sig)
3399 Perl_perly_sighandler(sig, NULL, NULL, 0);
3405 Perl_sighandler1(int sig)
3407 Perl_perly_sighandler(sig, NULL, NULL, 0);
3411 Perl_sighandler3(int sig, Siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
3413 Perl_perly_sighandler(sig, sip, uap, 0);
3417 /* Invoke the perl-level signal handler. This function is called either
3418 * directly from one of the C-level signals handlers (Perl_sighandler or
3419 * Perl_csighandler), or for safe signals, later from
3420 * Perl_despatch_signals() at a suitable safe point during execution.
3422 * 'safe' is a boolean indicating the latter call path.
3426 Perl_perly_sighandler(int sig, Siginfo_t *sip PERL_UNUSED_DECL,
3427 void *uap PERL_UNUSED_DECL, bool safe)
3429 #ifdef PERL_GET_SIG_CONTEXT
3430 dTHXa(PERL_GET_SIG_CONTEXT);
3437 SV * const tSv = PL_Sv;
3441 XPV * const tXpv = PL_Xpv;
3442 I32 old_ss_ix = PL_savestack_ix;
3443 SV *errsv_save = NULL;
3446 if (!PL_psig_ptr[sig]) {
3447 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
3452 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3453 /* Max number of items pushed there is 3*n or 4. We cannot fix
3454 infinity, so we fix 4 (in fact 5): */
3455 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3457 PL_savestack_ix += 5; /* Protect save in progress. */
3458 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3461 /* sv_2cv is too complicated, try a simpler variant first: */
3462 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
3463 || SvTYPE(cv) != SVt_PVCV) {
3465 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
3468 if (!cv || !CvROOT(cv)) {
3469 const HEK * const hek = gv
3473 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3475 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3476 "SIG%s handler \"%" HEKf "\" not defined.\n",
3477 PL_sig_name[sig], HEKfARG(hek));
3478 /* diag_listed_as: SIG%s handler "%s" not defined */
3479 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3480 "SIG%s handler \"__ANON__\" not defined.\n",
3485 sv = PL_psig_name[sig]
3486 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3487 : newSVpv(PL_sig_name[sig],0);
3491 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3492 /* make sure our assumption about the size of the SAVEs are correct:
3493 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3494 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3497 PUSHSTACKi(PERLSI_SIGNAL);
3501 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3503 struct sigaction oact;
3505 if (sip && sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
3507 SV *rv = newRV_noinc(MUTABLE_SV(sih));
3508 /* The siginfo fields signo, code, errno, pid, uid,
3509 * addr, status, and band are defined by POSIX/SUSv3. */
3510 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3511 (void)hv_stores(sih, "code", newSViv(sip->si_code));
3512 # ifdef HAS_SIGINFO_SI_ERRNO
3513 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3515 # ifdef HAS_SIGINFO_SI_STATUS
3516 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3518 # ifdef HAS_SIGINFO_SI_UID
3521 sv_setuid(uid, sip->si_uid);
3522 (void)hv_stores(sih, "uid", uid);
3525 # ifdef HAS_SIGINFO_SI_PID
3526 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3528 # ifdef HAS_SIGINFO_SI_ADDR
3529 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3531 # ifdef HAS_SIGINFO_SI_BAND
3532 (void)hv_stores(sih, "band", newSViv(sip->si_band));
3536 mPUSHp((char *)sip, sizeof(*sip));
3544 errsv_save = newSVsv(ERRSV);
3546 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
3550 SV * const errsv = ERRSV;
3551 if (SvTRUE_NN(errsv)) {
3552 SvREFCNT_dec(errsv_save);
3555 /* Handler "died", for example to get out of a restart-able read().
3556 * Before we re-do that on its behalf re-enable the signal which was
3557 * blocked by the system when we entered.
3559 # ifdef HAS_SIGPROCMASK
3561 /* safe signals called via dispatch_signals() set up a
3562 * savestack destructor, unblock_sigmask(), to
3563 * automatically unblock the handler at the end. If
3564 * instead we get here directly, we have to do it
3569 sigaddset(&set,sig);
3570 sigprocmask(SIG_UNBLOCK, &set, NULL);
3573 /* Not clear if this will work */
3574 /* XXX not clear if this should be protected by 'if (safe)'
3577 (void)rsignal(sig, SIG_IGN);
3578 (void)rsignal(sig, PL_csighandlerp);
3580 #endif /* !PERL_MICRO */
3585 sv_setsv(errsv, errsv_save);
3586 SvREFCNT_dec(errsv_save);
3591 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3592 PL_savestack_ix = old_ss_ix;
3594 SvREFCNT_dec_NN(sv);
3595 PL_op = myop; /* Apparently not needed... */
3597 PL_Sv = tSv; /* Restore global temporaries. */
3604 S_restore_magic(pTHX_ const void *p)
3606 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3607 SV* const sv = mgs->mgs_sv;
3613 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3614 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
3616 SvFLAGS(sv) |= mgs->mgs_flags;
3621 bumped = mgs->mgs_bumped;
3622 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3624 /* If we're still on top of the stack, pop us off. (That condition
3625 * will be satisfied if restore_magic was called explicitly, but *not*
3626 * if it's being called via leave_scope.)
3627 * The reason for doing this is that otherwise, things like sv_2cv()
3628 * may leave alloc gunk on the savestack, and some code
3629 * (e.g. sighandler) doesn't expect that...
3631 if (PL_savestack_ix == mgs->mgs_ss_ix)
3633 UV popval = SSPOPUV;
3634 assert(popval == SAVEt_DESTRUCTOR_X);
3635 PL_savestack_ix -= 2;
3637 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3638 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
3641 if (SvREFCNT(sv) == 1) {
3642 /* We hold the last reference to this SV, which implies that the
3643 SV was deleted as a side effect of the routines we called.
3644 So artificially keep it alive a bit longer.
3645 We avoid turning on the TEMP flag, which can cause the SV's
3646 buffer to get stolen (and maybe other stuff). */
3651 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
3655 /* clean up the mess created by Perl_sighandler().
3656 * Note that this is only called during an exit in a signal handler;
3657 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3661 S_unwind_handler_stack(pTHX_ const void *p)
3665 PL_savestack_ix -= 5; /* Unprotect save in progress. */
3669 =for apidoc_section Magic
3670 =for apidoc magic_sethint
3672 Triggered by a store to C<%^H>, records the key/value pair to
3673 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3674 anything that would need a deep copy. Maybe we should warn if we find a
3680 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3682 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
3683 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
3685 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3687 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3688 an alternative leaf in there, with PL_compiling.cop_hints being used if
3689 it's NULL. If needed for threads, the alternative could lock a mutex,
3690 or take other more complex action. */
3692 /* Something changed in %^H, so it will need to be restored on scope exit.
3693 Doing this here saves a lot of doing it manually in perl code (and
3694 forgetting to do it, and consequent subtle errors. */
3695 PL_hints |= HINT_LOCALIZE_HH;
3696 CopHINTHASH_set(&PL_compiling,
3697 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
3698 magic_sethint_feature(key, NULL, 0, sv, 0);
3703 =for apidoc magic_clearhint
3705 Triggered by a delete from C<%^H>, records the key to
3706 C<PL_compiling.cop_hints_hash>.
3711 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3713 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
3714 PERL_UNUSED_ARG(sv);
3716 PL_hints |= HINT_LOCALIZE_HH;
3717 CopHINTHASH_set(&PL_compiling,
3718 mg->mg_len == HEf_SVKEY
3719 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3720 MUTABLE_SV(mg->mg_ptr), 0, 0)
3721 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3722 mg->mg_ptr, mg->mg_len, 0, 0));
3723 if (mg->mg_len == HEf_SVKEY)
3724 magic_sethint_feature(MUTABLE_SV(mg->mg_ptr), NULL, 0, NULL, FALSE);
3726 magic_sethint_feature(NULL, mg->mg_ptr, mg->mg_len, NULL, FALSE);
3731 =for apidoc magic_clearhints
3733 Triggered by clearing C<%^H>, resets C<PL_compiling.cop_hints_hash>.
3738 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3740 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3741 PERL_UNUSED_ARG(sv);
3742 PERL_UNUSED_ARG(mg);
3743 cophh_free(CopHINTHASH_get(&PL_compiling));
3744 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
3750 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3751 const char *name, I32 namlen)
3755 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
3756 PERL_UNUSED_ARG(sv);
3757 PERL_UNUSED_ARG(name);
3758 PERL_UNUSED_ARG(namlen);
3760 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3761 nmg = mg_find(nsv, mg->mg_type);
3763 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3764 nmg->mg_ptr = mg->mg_ptr;
3765 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3766 nmg->mg_flags |= MGf_REFCOUNTED;
3771 Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3772 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3774 #if DBVARMG_SINGLE != 0
3775 assert(mg->mg_private >= DBVARMG_SINGLE);
3777 assert(mg->mg_private < DBVARMG_COUNT);
3779 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3785 Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3786 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3788 #if DBVARMG_SINGLE != 0
3789 assert(mg->mg_private >= DBVARMG_SINGLE);
3791 assert(mg->mg_private < DBVARMG_COUNT);
3792 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3798 * ex: set ts=8 sts=4 sw=4 et: