#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <sys/wait.h>

void sigusr1(int sig, siginfo_t *info, void *extra)
{
	void *ptr = info->si_value.sival_ptr;
	printf("1\n");
}
void firstProcess()
{
	struct sigaction action;
        action.sa_flags = SA_SIGINFO;
        action.sa_sigaction = &sigusr1;

	sigset_t oldset;
	sigemptyset(&action.sa_mask);
	sigaddset(&action.sa_mask, SIGUSR1);
	sigemptyset(&oldset);
	sigprocmask(SIG_BLOCK, &action.sa_mask, &oldset);
	if (sigaction(SIGUSR1, &action, 0) == -1) {
		exit(1);
	}
	int sig = 0;
	sigwait(&action.sa_mask, &sig);
	printf("%d\n", sig);
	exit(0);
}

void secondProcess()
{
	int i;
	exit(0);
}
int main(int argc, char *argv[])
{
	pid_t pid1, pid2, pid3;
	pid_t *arrpid;
	pid1 = fork();

	struct sigaction actStc;
        memset(&actStc, 0, sizeof(actStc));
//        actStc.sa_handler = firsthdl;
	//sigset_t set;
        sigemptyset(&actStc.sa_mask);
	sigaddset(&actStc.sa_mask, SIGUSR1);
	sigaction(SIGUSR1, &actStc, 0);
	//wait(NULL);
//	printf("%ld\n", strlen(argv[1]));
	if (pid1 == 0) {
		firstProcess();
	} else {
		sleep(1);
		union sigval sigUn;
		sigUn.sival_ptr = argv[1];
		sigqueue(pid1, SIGUSR1, sigUn);
//		kill(pid1, SIGUSR1);
		pid2 = fork();
		if (pid2 == 0) {
			secondProcess();
		} else {
			pid3 = fork();
			if (pid3 == 0) {
				//for ( ; ; );
			} else {
				//sleep(10);
			}
		}
	}
	//printf("%d\n", getSig);
	sleep(1);
	return 0;
}