programma 1

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <string.h>
#include <signal.h>
#include <ctype.h>
#define MAX 100

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

int file_descriptor[2];
pid_t pid1,pid2;
char string[MAX];
int n;
int i;
int len;
char buff[33];




if(pipe(file_descriptor)==0){
    pid1=fork();



if(pid1!=0){
    //padre
    pid2=fork();
    if(pid2==0){
        //PRODUCER WRITES INTO PIPE
        close(file_descriptor[0]);
        while(1){
        sleep(1);
        printf("Write row of the file\n");
        fgets(string,MAX,stdin);
        len=strlen(string);
        sprintf(buff,"%d",len);
        write(file_descriptor[1],buff,33);
        n=write(file_descriptor[1],string,strlen(string));
        printf("I wrote %d bytes\n",n);
        if(strcmp(string,"end\n")==0){
            exit(0);
        }}
        }else{
        //CONSUMER READS FROM PIPE
        close(file_descriptor[1]);
        while(1){
        read(file_descriptor[0],buff,33);
        len=atoi(buff);
        n=read(file_descriptor[0],string,len);
        printf("I read %d bytes\n",n);
        string[len+1]='\0';
        for(i=0;i<strlen(string);i++){
            string[i]=toupper(string[i]);

        }
        printf("%s",string);
        if(strcmp(string,"END")==0){
            exit(0);
        }}
    }
}


}




return(0);

}