#include "signal_check.h"

#include <errno.h>

volatile sig_atomic_t __caught_signals[NSIG];

static void __signal_handler(int sig)
{
        __caught_signals[sig] = 1;
}

static void __set_signal_handler(int sig, void (* handler)(int))
{
        struct sigaction act;
        act.sa_flags = 0;
        act.sa_handler = handler;
        while(sigaction(sig, &act, 0) && errno==EINTR);
}

void signal_handle(int sig)
{
        __set_signal_handler(sig, __signal_handler);
}

void signal_unhandle(int sig)
{
        signal_clear(sig);
        __set_signal_handler(sig, SIG_DFL);
}

int signal_is_pending(int sig)
{
        return __caught_signals[sig];
}

void signal_clear(int sig)
{
        __caught_signals[sig] = 0;
}