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#include <assert.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
static void handle_signal(int no)
{
_exit(128 + no);
}
int
main(void)
{
struct sigaction sa, sa1, sa2, sa3;
sa.sa_handler = SIG_IGN;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGHUP);
sigaddset(&sa.sa_mask, SIGINT);
sa.sa_flags = SA_RESTART;
assert(!sigaction(SIGUSR2, &sa, &sa1));
sa.sa_handler = handle_signal;
sigemptyset(&sa.sa_mask);
sigaddset(&sa.sa_mask, SIGQUIT);
sigaddset(&sa.sa_mask, SIGTERM);
sa.sa_flags = SA_SIGINFO;
assert(!sigaction(SIGUSR2, &sa, &sa2));
sa.sa_handler = SIG_DFL;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
assert(!sigaction(SIGUSR2, &sa, &sa3));
return 0;
}
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