int main()
{
struct sigaction sigact;
struct itimerval itval;
sigact.sa_handler = HandleSegv;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
if (sigaction(SIGSEGV, &sigact, 0) == -1)
{
fprintf(stderr, "Unable handle SEGV\n");
return 1;
}
sigact.sa_handler = HandleAlarm;
if (sigaction(SIGVTALRM, &sigact, 0) == -1)
{
fprintf(stderr, "Unable handle VTALRM\n");
return 1;
}
itval.it_value.tv_sec = 0;
itval.it_value.tv_usec = 100000;
itval.it_interval.tv_sec = 0;
itval.it_interval.tv_usec = 0;
if (setitimer(ITIMER_VIRTUAL, &itval, 0) == -1)
{
fprintf(stderr, "Unable to set up alarm\n");
return 1;
}
MakeSegv();
return 0;
}
void Handle(int sig, siginfo_t* info, void* vctxt)
{
struct sigaction sigact;
if (sig == SIGSEGV)
printf("Got signal SEGV\n");
else if(sig == SIGBUS)
printf("Got signal SIGBUS\n");
else
printf("Got signal %d\n", sig);
/*
* Print out some information about the SEGV disposition. The handler should
* be reset to SIG_DFL. I'm not sure if the standard defines what happens to
* the other fields.
*/
if (sigaction(sig, 0, &sigact) == -1)
{
printf("Unable to read signal information\n");
exit(1);
}
if (sigact.sa_handler == SIG_DFL)
printf("sa_handler = SIG_DFL\n");
else
printf("sa_handler = 0x%p\n", sigact.sa_handler);
if (sigact.sa_flags & (SA_RESETHAND | SA_SIGINFO))
printf("sa_flags = [SA_RESETHAND, SA_SIGINFO]\n");
else if (sigact.sa_flags & SA_RESETHAND)
printf("sa_flags = [SA_RESETHAND]\n");
else if (sigact.sa_flags & SA_SIGINFO)
printf("sa_flags = [SA_SIGINFO]\n");
else
printf("sa_flags = []\n");
if (sigismember(&sigact.sa_mask, SIGUSR1))
printf("sa_mask = [SIGUSR1]\n");
else
printf("sa_mask = []\n");
fflush(stdout);
if (First)
{
First = 0;
MakeSegv();
/* does not return */
}
printf("Should not receive second SEGV\n");
exit(1);
}
int main()
{
struct sigaction sigact;
sigact.sa_sigaction = Handle;
sigact.sa_flags = (SA_RESETHAND | SA_SIGINFO);
sigemptyset(&sigact.sa_mask);
sigaddset(&sigact.sa_mask, SIGUSR1);
if (sigaction(SIGSEGV, &sigact, 0) == -1)
{
printf("Unable to handle signal\n");
return 1;
}
if (sigaction(SIGBUS, &sigact, 0) == -1)
{
printf("Unable to handle signal\n");
return 1;
}
MakeSegv();
printf("Should not return from first SEGV\n");
return 1;
}
