99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
#include <signal.h>
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typedef int (*callvec)() ;
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static callvec vector[16] = {
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SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL,
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SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL, SIG_DFL
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} ;
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static char mapvec[] = {
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0, /* EARRAY */
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0, /* ERANGE */
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0, /* ESET */
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0, /* EIOVFL */
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SIGFPE, /* EFOVFL */
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SIGFPE, /* EFUNDFL */
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0, /* EIDIVZ */
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SIGFPE, /* EFDIVZ */
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0, /* EIUND, already ignored */
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SIGFPE, /* EFUND */
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0, /* ECONV */
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0, /* 11 */
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0, /* 12 */
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0, /* 13 */
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0, /* 14 */
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0, /* 15 */
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SIGSEGV, /* ESTACK */
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SIGSEGV, /* EHEAP */
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0, /* EILLINS */
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0, /* EODDZ */
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0, /* ECASE */
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SIGSEGV, /* EBADMEM */
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SIGBUS, /* EBADPTR */
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0, /* EBADPC */
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0, /* EBADLAE */
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SIGSYS, /* EBADMON */
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0, /* EBADLIN */
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0, /* EBADGTO */
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} ;
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#define VECBASE 128
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static firsttime = 1 ;
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static int catchtrp() ;
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static int procesig() ;
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callvec signal(sig,func) int sig ; callvec func ; {
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register index, i ;
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callvec prev ;
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index= sig-1 ;
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if ( index<0 || index>=(sizeof vector/sizeof vector[0]) ) {
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return (callvec) -1 ;
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}
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if ( firsttime ) {
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firsttime= 0 ;
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_setsig(catchtrp) ;
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}
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prev= vector[index] ;
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if ( prev!=func ) {
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register int mapval ;
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vector[index]= func ;
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if ( func==SIG_IGN ) {
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mapval= -3;
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} else if ( func==SIG_DFL ) {
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mapval= -2;
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} else {
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mapval=VECBASE+sig;
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}
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if ( sigtrp(mapval,sig)== -1 ) return (callvec) -1;
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}
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return prev ;
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}
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static int catchtrp(trapno) int trapno ; {
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if ( trapno>VECBASE &&
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trapno<=VECBASE + (sizeof vector/sizeof vector[0]) ) {
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return procesig(trapno-VECBASE) ;
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}
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if ( trapno>=0 && trapno< (sizeof mapvec/sizeof mapvec[0]) &&
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mapvec[trapno] ) {
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return procesig(mapvec[trapno]) ;
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}
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return 0 ; /* Failed to handle the trap */
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}
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static int procesig(sig) int sig ; {
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register index ;
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callvec trf ;
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index= sig-1 ;
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trf= vector[index] ;
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if ( trf==SIG_IGN ) return 1 ;
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if ( sig!=SIGILL && sig!=SIGTRAP ) vector[index]= SIG_IGN ;
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if ( trf==SIG_DFL ) return 0 ;
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(*trf)(sig) ;
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return 1 ;
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}
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