3 * Copyright (c) 1991-1994, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * "Sam sat on the ground and put his head in his hands. 'I wish I had never
12 * come here, and I don't want to see no more magic,' he said, and fell silent."
18 /* Omit -- it causes too much grief on mixed systems.
25 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
32 typedef struct magic_state MGS;
34 static void restore_magic _((void *p));
42 assert(SvMAGICAL(sv));
44 mgs = (MGS*)safemalloc(sizeof(MGS));
46 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
47 SAVEDESTRUCTOR(restore_magic, mgs);
51 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
63 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
66 SvFLAGS(sv) |= mgs->mgs_flags;
70 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
82 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
83 MGVTBL* vtbl = mg->mg_virtual;
85 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
89 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
104 mgs = save_magic(sv);
107 while ((mg = *mgp) != 0) {
108 MGVTBL* vtbl = mg->mg_virtual;
109 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
110 (*vtbl->svt_get)(sv, mg);
111 /* Ignore this magic if it's been deleted */
112 if (*mgp == mg && (mg->mg_flags & MGf_GSKIP))
115 /* Advance to next magic (complicated by possible deletion) */
117 mgp = &mg->mg_moremagic;
133 mgs = save_magic(sv);
135 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
136 MGVTBL* vtbl = mg->mg_virtual;
137 nextmg = mg->mg_moremagic; /* it may delete itself */
138 if (mg->mg_flags & MGf_GSKIP) {
139 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
142 if (vtbl && vtbl->svt_set)
143 (*vtbl->svt_set)(sv, mg);
158 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
159 MGVTBL* vtbl = mg->mg_virtual;
160 if (vtbl && vtbl->svt_len) {
163 /* omit MGf_GSKIP -- not changed here */
164 len = (*vtbl->svt_len)(sv, mg);
170 junk = SvPV(sv, len);
183 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
184 MGVTBL* vtbl = mg->mg_virtual;
185 /* omit GSKIP -- never set here */
187 if (vtbl && vtbl->svt_clear)
188 (*vtbl->svt_clear)(sv, mg);
201 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
202 if (mg->mg_type == type)
209 mg_copy(sv, nsv, key, klen)
217 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
218 if (isUPPER(mg->mg_type)) {
219 sv_magic(nsv, mg->mg_obj, toLOWER(mg->mg_type), key, klen);
232 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
233 MGVTBL* vtbl = mg->mg_virtual;
234 moremagic = mg->mg_moremagic;
235 if (vtbl && vtbl->svt_free)
236 (*vtbl->svt_free)(sv, mg);
237 if (mg->mg_ptr && mg->mg_type != 'g')
238 Safefree(mg->mg_ptr);
239 if (mg->mg_flags & MGf_REFCOUNTED)
240 SvREFCNT_dec(mg->mg_obj);
247 #if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
261 switch (*mg->mg_ptr) {
262 case '1': case '2': case '3': case '4':
263 case '5': case '6': case '7': case '8': case '9': case '&':
265 paren = atoi(mg->mg_ptr);
267 if (curpm->op_pmregexp &&
268 paren <= curpm->op_pmregexp->nparens &&
269 (s = curpm->op_pmregexp->startp[paren]) &&
270 (t = curpm->op_pmregexp->endp[paren]) ) {
280 paren = curpm->op_pmregexp->lastparen;
289 if (curpm->op_pmregexp &&
290 (s = curpm->op_pmregexp->subbeg) ) {
291 i = curpm->op_pmregexp->startp[0] - s;
299 if (curpm->op_pmregexp &&
300 (s = curpm->op_pmregexp->endp[0]) ) {
301 return (STRLEN) (curpm->op_pmregexp->subend - s);
306 return (STRLEN)ofslen;
308 return (STRLEN)orslen;
311 if (!SvPOK(sv) && SvNIOK(sv))
328 switch (*mg->mg_ptr) {
329 case '\001': /* ^A */
330 sv_setsv(sv, bodytarget);
332 case '\004': /* ^D */
333 sv_setiv(sv,(I32)(debug & 32767));
335 case '\005': /* ^E */
338 # include <descrip.h>
339 # include <starlet.h>
341 $DESCRIPTOR(msgdsc,msg);
342 sv_setnv(sv,(double)vaxc$errno);
343 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
344 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
349 sv_setnv(sv,(double)errno);
350 sv_setpv(sv, errno ? Strerror(errno) : "");
352 SvNOK_on(sv); /* what a wonderful hack! */
354 case '\006': /* ^F */
355 sv_setiv(sv,(I32)maxsysfd);
357 case '\010': /* ^H */
358 sv_setiv(sv,(I32)hints);
362 sv_setpv(sv, inplace);
364 sv_setsv(sv,&sv_undef);
366 case '\017': /* ^O */
369 case '\020': /* ^P */
370 sv_setiv(sv,(I32)perldb);
372 case '\024': /* ^T */
373 sv_setiv(sv,(I32)basetime);
375 case '\027': /* ^W */
376 sv_setiv(sv,(I32)dowarn);
378 case '1': case '2': case '3': case '4':
379 case '5': case '6': case '7': case '8': case '9': case '&':
381 paren = atoi(GvENAME(mg->mg_obj));
383 if (curpm->op_pmregexp &&
384 paren <= curpm->op_pmregexp->nparens &&
385 (s = curpm->op_pmregexp->startp[paren]) &&
386 (t = curpm->op_pmregexp->endp[paren]) ) {
391 if (tainting && (tmg = mg_find(sv,'t')))
392 tmg->mg_len = 0; /* guarantee $1 untainted */
397 sv_setsv(sv,&sv_undef);
401 paren = curpm->op_pmregexp->lastparen;
405 sv_setsv(sv,&sv_undef);
409 if (curpm->op_pmregexp &&
410 (s = curpm->op_pmregexp->subbeg) ) {
411 i = curpm->op_pmregexp->startp[0] - s;
418 sv_setsv(sv,&sv_undef);
422 if (curpm->op_pmregexp &&
423 (s = curpm->op_pmregexp->endp[0]) ) {
424 sv_setpvn(sv,s, curpm->op_pmregexp->subend - s);
428 sv_setsv(sv,&sv_undef);
432 if (GvIO(last_in_gv)) {
433 sv_setiv(sv,(I32)IoLINES(GvIO(last_in_gv)));
438 sv_setiv(sv,(I32)statusvalue);
441 s = IoTOP_NAME(GvIOp(defoutgv));
445 sv_setpv(sv,GvENAME(defoutgv));
450 s = IoFMT_NAME(GvIOp(defoutgv));
452 s = GvENAME(defoutgv);
457 sv_setiv(sv,(I32)IoPAGE_LEN(GvIOp(defoutgv)));
460 sv_setiv(sv,(I32)IoLINES_LEFT(GvIOp(defoutgv)));
463 sv_setiv(sv,(I32)IoPAGE(GvIOp(defoutgv)));
471 sv_setiv(sv,(I32)curcop->cop_arybase);
474 sv_setiv(sv, (IoFLAGS(GvIOp(defoutgv)) & IOf_FLUSH) != 0 );
477 sv_setpvn(sv,ofs,ofslen);
480 sv_setpvn(sv,ors,orslen);
487 sv_setnv(sv,(double)((errno == EVMSERR) ? vaxc$errno : errno));
489 sv_setnv(sv,(double)errno);
491 sv_setpv(sv, errno ? Strerror(errno) : "");
492 SvNOK_on(sv); /* what a wonderful hack! */
495 sv_setiv(sv,(I32)uid);
498 sv_setiv(sv,(I32)euid);
502 (void)sprintf(s,"%d",(int)gid);
506 (void)sprintf(s,"%d",(int)egid);
514 Groups_t gary[NGROUPS];
516 i = getgroups(NGROUPS,gary);
518 (void)sprintf(s," %ld", (long)gary[i]);
534 magic_getuvar(sv, mg)
538 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
540 if (uf && uf->uf_val)
541 (*uf->uf_val)(uf->uf_index, sv);
554 my_setenv(mg->mg_ptr,s);
555 #ifdef DYNAMIC_ENV_FETCH
556 /* We just undefd an environment var. Is a replacement */
557 /* waiting in the wings? */
560 if (envsvp = hv_fetch(GvHVn(envgv),mg->mg_ptr,mg->mg_len,FALSE))
561 s = SvPV(*envsvp,len);
564 /* And you'll never guess what the dog had */
565 /* in its mouth... */
567 if (s && strEQ(mg->mg_ptr,"PATH")) {
568 char *strend = s + len;
571 s = cpytill(tokenbuf,s,strend,':',&i);
574 || (Stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
583 magic_clearenv(sv,mg)
587 my_setenv(mg->mg_ptr,Nullch);
592 /* set up reliable signal() clone */
594 typedef void (*Sigfunc) _((int));
597 Sigfunc rsignal(signo,handler)
601 struct sigaction act,oact;
603 act.sa_handler = handler;
604 sigemptyset(&act.sa_mask);
607 if (signo == SIGALRM) {
612 act.sa_flags |= SA_INTERRUPT; /* SunOS */
616 act.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
619 if (sigaction(signo, &act, &oact) < 0)
622 return(oact.sa_handler);
627 /* ah well, so much for reliability */
629 #define rsignal(x,y) signal(x,y)
646 if (strEQ(s,"__DIE__"))
648 else if (strEQ(s,"__WARN__"))
650 else if (strEQ(s,"__PARSE__"))
653 croak("No such hook: %s", s);
661 i = whichsig(s); /* ...no, a brick */
663 if (dowarn || strEQ(s,"ALARM"))
664 warn("No such signal: SIG%s", s);
668 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
670 (void)rsignal(i,sighandler);
672 *svp = SvREFCNT_inc(sv);
675 s = SvPV_force(sv,na);
676 if (strEQ(s,"IGNORE")) {
678 (void)rsignal(i,SIG_IGN);
682 else if (strEQ(s,"DEFAULT") || !*s) {
684 (void)rsignal(i,SIG_DFL);
689 if (!strchr(s,':') && !strchr(s,'\'')) {
690 sprintf(tokenbuf, "main::%s",s);
691 sv_setpv(sv,tokenbuf);
694 (void)rsignal(i,sighandler);
696 *svp = SvREFCNT_inc(sv);
713 magic_setamagic(sv,mg)
717 /* HV_badAMAGIC_on(Sv_STASH(sv)); */
722 #endif /* OVERLOAD */
725 magic_methpack(sv,mg,meth)
739 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
740 else if (mg->mg_type == 'p')
741 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
744 if (perl_call_method(meth, G_SCALAR))
745 sv_setsv(sv, *stack_sp--);
757 magic_methpack(sv,mg,"FETCH");
759 mg->mg_flags |= MGf_GSKIP;
775 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
776 else if (mg->mg_type == 'p')
777 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
781 perl_call_method("STORE", G_SCALAR|G_DISCARD);
787 magic_clearpack(sv,mg)
791 return magic_methpack(sv,mg,"DELETE");
794 int magic_wipepack(sv,mg)
805 perl_call_method("CLEAR", G_SCALAR|G_DISCARD);
811 magic_nextpack(sv,mg,key)
818 char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
829 if (perl_call_method(meth, G_SCALAR))
830 sv_setsv(key, *stack_sp--);
838 magic_existspack(sv,mg)
842 return magic_methpack(sv,mg,"EXISTS");
846 magic_setdbline(sv,mg)
858 svp = av_fetch(GvAV(gv),atoi(mg->mg_ptr), FALSE);
859 if (svp && SvIOKp(*svp) && (o = (OP*)SvSTASH(*svp)))
862 warn("Can't break at that line\n");
867 magic_getarylen(sv,mg)
871 sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + curcop->cop_arybase);
876 magic_setarylen(sv,mg)
880 av_fill((AV*)mg->mg_obj, SvIV(sv) - curcop->cop_arybase);
889 SV* lsv = LvTARG(sv);
891 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
892 mg = mg_find(lsv, 'g');
893 if (mg && mg->mg_len >= 0) {
894 sv_setiv(sv, mg->mg_len + curcop->cop_arybase);
907 SV* lsv = LvTARG(sv);
913 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
914 mg = mg_find(lsv, 'g');
918 sv_magic(lsv, (SV*)0, 'g', Nullch, 0);
919 mg = mg_find(lsv, 'g');
921 else if (!SvOK(sv)) {
925 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
927 pos = SvIV(sv) - curcop->cop_arybase;
945 gv_efullname(sv,((GV*)sv));/* a gv value, be nice */
960 if (*s == '*' && s[1])
962 gv = gv_fetchpv(s,TRUE, SVt_PVGV);
967 GvGP(sv) = gp_ref(GvGP(gv));
978 magic_setsubstr(sv,mg)
983 char *tmps = SvPV(sv,len);
984 sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps, len);
989 magic_gettaint(sv,mg)
995 else if (mg->mg_len & 2 && mg->mg_obj == sv) /* kludge */
1001 magic_settaint(sv,mg)
1007 if (localizing == 1)
1024 do_vecset(sv); /* XXX slurp this routine */
1029 magic_setmglob(sv,mg)
1043 sv_unmagic(sv, 'B');
1049 magic_setuvar(sv,mg)
1053 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
1055 if (uf && uf->uf_set)
1056 (*uf->uf_set)(uf->uf_index, sv);
1069 switch (*mg->mg_ptr) {
1070 case '\001': /* ^A */
1071 sv_setsv(bodytarget, sv);
1073 case '\004': /* ^D */
1074 debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | 0x80000000;
1075 DEBUG_x(dump_all());
1077 case '\005': /* ^E */
1079 set_vaxc_errno(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1081 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv),4); /* will anyone ever use this? */
1084 case '\006': /* ^F */
1085 maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1087 case '\010': /* ^H */
1088 hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1094 inplace = savepv(SvPV(sv,na));
1098 case '\017': /* ^O */
1102 osname = savepv(SvPV(sv,na));
1106 case '\020': /* ^P */
1107 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1116 case '\024': /* ^T */
1117 basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1119 case '\027': /* ^W */
1120 dowarn = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1124 if (localizing == 1)
1125 save_sptr((SV**)&last_in_gv);
1128 IoLINES(GvIOp(last_in_gv)) = (long)SvIV(sv);
1131 Safefree(IoTOP_NAME(GvIOp(defoutgv)));
1132 IoTOP_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1133 IoTOP_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1136 Safefree(IoFMT_NAME(GvIOp(defoutgv)));
1137 IoFMT_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1138 IoFMT_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1141 IoPAGE_LEN(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1144 IoLINES_LEFT(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1145 if (IoLINES_LEFT(GvIOp(defoutgv)) < 0L)
1146 IoLINES_LEFT(GvIOp(defoutgv)) = 0L;
1149 IoPAGE(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1152 IoFLAGS(GvIOp(defoutgv)) &= ~IOf_FLUSH;
1153 if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) != 0) {
1154 IoFLAGS(GvIOp(defoutgv)) |= IOf_FLUSH;
1158 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1159 multiline = (i != 0);
1165 rs = SvREFCNT_inc(nrs);
1170 ors = savepv(SvPV(sv,orslen));
1175 ofs = savepv(SvPV(sv, ofslen));
1180 ofmt = savepv(SvPV(sv,na));
1183 compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1186 statusvalue = FIXSTATUS(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1189 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv),SvIV(sv) == EVMSERR ? 4 : vaxc$errno); /* will anyone ever use this? */
1192 uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1194 delaymagic |= DM_RUID;
1195 break; /* don't do magic till later */
1198 (void)setruid((Uid_t)uid);
1201 (void)setreuid((Uid_t)uid, (Uid_t)-1);
1203 #ifdef HAS_SETRESUID
1204 (void)setresuid((Uid_t)uid, (Uid_t)-1, (Uid_t)-1);
1206 if (uid == euid) /* special case $< = $> */
1209 uid = (I32)getuid();
1210 croak("setruid() not implemented");
1215 uid = (I32)getuid();
1216 tainting |= (uid && (euid != uid || egid != gid));
1219 euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1221 delaymagic |= DM_EUID;
1222 break; /* don't do magic till later */
1225 (void)seteuid((Uid_t)euid);
1228 (void)setreuid((Uid_t)-1, (Uid_t)euid);
1230 #ifdef HAS_SETRESUID
1231 (void)setresuid((Uid_t)-1, (Uid_t)euid, (Uid_t)-1);
1233 if (euid == uid) /* special case $> = $< */
1236 euid = (I32)geteuid();
1237 croak("seteuid() not implemented");
1242 euid = (I32)geteuid();
1243 tainting |= (uid && (euid != uid || egid != gid));
1246 gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1248 delaymagic |= DM_RGID;
1249 break; /* don't do magic till later */
1252 (void)setrgid((Gid_t)gid);
1255 (void)setregid((Gid_t)gid, (Gid_t)-1);
1257 #ifdef HAS_SETRESGID
1258 (void)setresgid((Gid_t)gid, (Gid_t)-1, (Gid_t) 1);
1260 if (gid == egid) /* special case $( = $) */
1263 gid = (I32)getgid();
1264 croak("setrgid() not implemented");
1269 gid = (I32)getgid();
1270 tainting |= (uid && (euid != uid || egid != gid));
1273 egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1275 delaymagic |= DM_EGID;
1276 break; /* don't do magic till later */
1279 (void)setegid((Gid_t)egid);
1282 (void)setregid((Gid_t)-1, (Gid_t)egid);
1284 #ifdef HAS_SETRESGID
1285 (void)setresgid((Gid_t)-1, (Gid_t)egid, (Gid_t)-1);
1287 if (egid == gid) /* special case $) = $( */
1290 egid = (I32)getegid();
1291 croak("setegid() not implemented");
1296 egid = (I32)getegid();
1297 tainting |= (uid && (euid != uid || egid != gid));
1300 chopset = SvPV_force(sv,na);
1306 /* See if all the arguments are contiguous in memory */
1307 for (i = 1; i < origargc; i++) {
1308 if (origargv[i] == s + 1)
1309 s += strlen(++s); /* this one is ok too */
1311 if (origenviron[0] == s + 1) { /* can grab env area too? */
1312 my_setenv("NoNeSuCh", Nullch);
1313 /* force copy of environment */
1314 for (i = 0; origenviron[i]; i++)
1315 if (origenviron[i] == s + 1)
1318 origalen = s - origargv[0];
1320 s = SvPV_force(sv,len);
1322 if (i >= origalen) {
1326 Copy(s, origargv[0], i, char);
1329 Copy(s, origargv[0], i, char);
1332 while (++i < origalen)
1335 for (i = 1; i < origargc; i++)
1336 origargv[i] = Nullch;
1345 magic_mutexfree(sv, mg)
1351 croak("panic: magic_mutexfree");
1352 MUTEX_DESTROY(MgMUTEXP(mg));
1353 COND_DESTROY(MgCONDP(mg));
1356 #endif /* USE_THREADS */
1362 register char **sigv;
1364 for (sigv = sig_name+1; *sigv; sigv++)
1365 if (strEQ(sig,*sigv))
1366 return sig_num[sigv - sig_name];
1368 if (strEQ(sig,"CHLD"))
1372 if (strEQ(sig,"CLD"))
1391 #ifdef OS2 /* or anybody else who requires SIG_ACK */
1392 signal(sig, SIG_ACK);
1395 signame = sig_name[sig];
1396 cv = sv_2cv(*hv_fetch(GvHVn(siggv),signame,strlen(signame),
1399 if (!cv || !CvROOT(cv) &&
1400 *signame == 'C' && instr(signame,"LD")) {
1402 if (signame[1] == 'H')
1403 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CLD",3,TRUE),
1406 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CHLD",4,TRUE),
1410 if (!cv || !CvROOT(cv)) {
1412 warn("SIG%s handler \"%s\" not defined.\n",
1413 signame, GvENAME(gv) );
1418 if (stack != signalstack)
1419 AvFILL(signalstack) = 0;
1420 SWITCHSTACK(stack, signalstack);
1422 sv = sv_newmortal();
1423 sv_setpv(sv,signame);
1428 perl_call_sv((SV*)cv, G_DISCARD);
1430 SWITCHSTACK(signalstack, oldstack);