#include <stdlib.h> // e x i t ( . . ) , EXIT_SUCCESS
#include "application-sigrt.h"
#include <string.h>
#include <unistd.h>
#include <stdio.h>


#define  __START__ 0
#define EXPECTING 1
#define OPERATING 2
#define __FINAL__ 3

sigset_t mask ;
volatile sig_atomic_t state = __START__ ;

void handleStart ( int signum , siginfo_t * info , void * context ) {
	state = OPERATING ;
	sigaddset (& mask , SIGRT_START );
	sigprocmask ( SIG_SETMASK , & mask , NULL );
}

void handleFinal ( int signum , siginfo_t * info , void * context ) {
	state = __FINAL__ ;
	sigaddset (& mask , SIGRT_FINAL );
	sigprocmask ( SIG_SETMASK , & mask , NULL );
}

int main ( int argc , char * argv []) {
	sigfillset (& mask );
	sigprocmask ( SIG_SETMASK , & mask , NULL );
	struct sigaction descriptor ;
	memset(& descriptor , 0 , sizeof ( descriptor ));
	descriptor.sa_flags = SA_SIGINFO ;
	descriptor.sa_sigaction = handleStart ;
	sigaction ( SIGRT_START , & descriptor , NULL );
	descriptor.sa_sigaction = handleFinal ;
	sigaction ( SIGRT_FINAL , & descriptor , NULL );
	state = EXPECTING ;
	sigdelset (& mask , SIGRT_START );
	sigprocmask ( SIG_SETMASK , & mask , NULL );
	while ( state == EXPECTING )
		pause();
	sigdelset (& mask , SIGRT_FINAL );
	sigprocmask ( SIG_SETMASK , & mask , NULL );
	while ( state == OPERATING ) {
		// Working on something . . .
		printf("f");
	}
	exit ( EXIT_SUCCESS );
}