#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>

#define TAILLE 20
void Erreur(const char *);
void main() {
	int fd_access, fd;
	char Message[TAILLE + 1];
	do
		fd_access = access("mytube",R_OK);
	while(fd_access == -1);
	if((fd = open("mytube",O_RDONLY))== -1){
		Erreur("Open lecture:");
		read(fd,Message,TAILLE+1);
		printf("Message recu par le consultant: %s\n",Message);
		close(fd);
	}
	if ((fd = open("mytube",O_WRONLY)) == -1){
		Erreur("open ecriture");
	}
	strcpy(Message, "retour test");
	write(fd,Message,strlen(Message)+1);
	printf("Message envoye par le consultant : %s\n",Message);
	close(fd);
}

void Erreur (const char * Message){
	perror(Message);
	exit(-1);
}