Re: signal catching not work

When I use the siglongjmp and sigsetjmp which are in C99, and the 
problem solved!!! :-)
Because a normal longjmp may not save the signal context in it jump
buffer.


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <setjmp.h>

jmp_buf buf;
volatile int i=0;
void sighandler(int a){
     siglongjmp(buf, ++i);
}

union {
     int *p;
     int i;
} a;

int *p;

int main(){
     if(signal(SIGSEGV, sighandler)==SIG_ERR){
         perror("error signal");
         abort();
     }
     while(1){
         switch(sigsetjmp(buf,1)){
             case 0:
                 a.i=0;
                 printf("%d\n", *(a.p));
                 break;
             case 1:
                 puts("Union way has failed to access value in position 
0.");
                 memset(&p,0,sizeof(int*));
                 printf("%d\n", *p);
                 break;
             default:
                 puts("Memset way has failed to access value in position 
0.");
                 return;
         }
     }
}
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