// Sample pipe() program (man pipe)

// Creates one children process, and a pipe for them to share data


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

#define NCHILDS (1)

int des[2]; // array of 2 file descriptors

int main(int argc, char** argv)
{
	int childpid[NCHILDS];

	int i;
	int j;
	int fChild = 0; // flag if its a child proc or not
	int buf;


	printf("Sample fork() program.\n");


	printf("Parent's PID is %d\n", getpid());


	// BEFORE FORKING!!!

	if (pipe(des) == -1)
	{
		printf("broken broken broken\n"	);
	}

	printf("Forking...\n");
	for (i = 0; i < NCHILDS; i++)
	{
		childpid[i] = fork();

		// Get out of the loop if it's a child process
		if (childpid[i] == 0)
		{
			fChild = 1;
			break;
		}
	}

	if (fChild == 1)
	{
		/* child */

		close(des[1]);

		// child will create random data, and tell its parent

		for (j = 0; j < 10; j++)
		{
			buf = rand();
			write(des[0],&buf, sizeof(buf));
			sleep(1);
		}
	}
	else
	{
		close(des[0]);

		/* parent */
		while (read(des[1], &buf, sizeof(buf)) != 0)
		{
			printf("buf = %d\n", buf);
		}

	}
	return 0;
}