/* Exemplu simplu in care folosim o comunicare unidirectionala prin pipe. Fiul
 * ii scrie parintelui un int si un string, iar parintele le citeste is le 
 * afiseaza.
 */
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

main() {
	int p1[2];
	int n, i;	
	char str[] = "test";

	pipe(p1); 
	if (fork()>0) { // suntem in parinte
		close(p1[1]);
		wait();
		i = read(p1[0], &n, sizeof(int));
		if (i<0) perror("Parinte - err la read:");

		i = read(p1[0], str, sizeof(str));
		if (i<0) perror("Parinte - err la read:");

		printf("Parinte - am citit %d si %s\n", n, str);
		close(p1[0]);
	} else { 	// suntem in fiu
		close(p1[0]);
		n = 10;
		i = write(p1[1], &n, sizeof(int));
		if (i<0) perror("Fiu - err la write:");

		i = write(p1[1], str, strlen(str)+1);
		if (i<0) perror("Fiu - err la write:");

		close(p1[1]);
		exit(0);
	}
}