int main()
{
struct sigaction act;
sigset_t ss;
act.sa_sigaction = Handle;
act.sa_flags = SA_SIGINFO;
sigemptyset(&act.sa_mask);
if (sigaction(SIGUSR1, &act, 0) != 0)
{
fprintf(stderr,"unable to set SIGUSR1 handler\n");
return 1;
}
sigemptyset(&act.sa_mask);
if (sigaction(SIGUSR2, &act, 0) !=0)
{
fprintf(stderr,"unable to set SIGUSR2 handler\n");
return 1;
}
sigfillset(&ss);
sigprocmask(SIG_SETMASK, &ss, 0);
kill(getpid(), SIGUSR1);
kill(getpid(), SIGUSR2);
sigdelset(&ss, SIGUSR1);
sigdelset(&ss, SIGUSR2);
sigdelset(&ss, SIGSEGV);
sigsuspend(&ss);
sigprocmask(SIG_SETMASK, 0, &ss);
CheckSigs(&ss, "After signal");
return 0;
}
int main()
{
sigset_t sigset;
struct sigaction sa;
sa.sa_handler = Handler;
sa.sa_flags = 0;
// Block sigterm in the handler
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGTERM);
// Block USR1 here
sigemptyset(&sigset);
sigaddset(&sigset, SIGUSR1);
sigprocmask(SIG_BLOCK, &sigset, 0);
sigaction(SIGWINCH, &sa, 0);
fprintf(stderr,"Before signal1\n");
fprintf(stderr,"--------------\n");
CheckSigs();
// the kernel blocks SIGWINCH in the handler
kill(0, SIGWINCH);
fprintf(stderr,"After signal1\n");
fprintf(stderr,"--------------\n");
CheckSigs();
// No defer should not block SIGWINCH in handler
sa.sa_flags |= SA_NODEFER;
sigaction(SIGWINCH, &sa, 0);
kill(0, SIGWINCH);
fprintf(stderr,"After signal2\n");
fprintf(stderr,"--------------\n");
CheckSigs();
return 0;
}
void Handler(int n)
{
fprintf(stderr,"In handler\n");
fprintf(stderr,"--------------\n");
CheckSigs();
}
