gistfile1.cpp

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

using namespace std;

#define tam 100

int main(int argc, char *argv[])
{
	pid_t pid;
	int tuba[2], tubb[2], bytesleidos;
	char memoria[tam];

	pipe(tuba);
	pipe(tubb);

	if((pid=fork()) == 0)
	{
		//hijjo
		close(tuba[1]);
		close(tubb[0]);
		string msjh = "";
		cout<<"Proceso hijo corriendo "<<endl;

		//bloqueo hasta que llegue mensaje
		while((bytesleidos=read(tuba[0],memoria,tam)) > 0)
		{
			memoria[bytesleidos] = '\0';
			string msjp = (string)memoria;
			cout<<"Mensaje del padre: "<<msjp<<endl;
		}
		close(tuba[0]);
		memoria[0] = '\0';

		strcpy(memoria,"Recibido \n");
		write(tubb[1],memoria,strlen(memoria));
		close(tubb[1]);
	}
	else{
		//padres
		close(tuba[0]);
		close(tubb[1]);
		string msjp = "";
		cout<<"Digita mensaje: ";
		cin>>msjp;
		strcpy(memoria,msjp.c_str());
		write(tuba[1],memoria,msjp.size());
		close(tuba[1]);

		while((bytesleidos=read(tubb[0],memoria,tam)) > 0)
		{
			memoria[bytesleidos] = '\0';
			string msjh = (string)memoria;
			cout<<"Mensaje del hijo: "<<msjh<<endl;
		}
		close(tubb[0]);
	}
	waitpid(pid,NULL,0);
	exit(0);
}