#include<stdio.h>
#include<fcntl.h>
#include<errno.h>
#include<stdlib.h>
 #define MAX 512
void fatal(const char *str){
	fprintf(stderr,"%s:%s\n",str,strerror (errno));
}
void druk(buf){
int i;
for(i=0;i<10;i++)
	printf("Odczytano\n %d");
printf( "%d",buf[i]);
}
int main(int argc,char *argv[]){
	int fd;
	int n_read, n_written;
	char buf[MAX];
	pid_t pid1;

fd=open("PLK", O_WRONLY|O_CREAT,0640);
if(fd== -1){
	fatal(" blad w open\n");
	exit(1);
}
printf("Wpisz tekst i nacisnij ENTER lub Ctrl-D\n");
while((n_read = read(0, buf, MAX)) < 20)
  printf("Wpisz tekst i nacisnij ENTER lub Ctrl-D\n");
if(n_read== -1){
	fatal("blad w read");
	exit(1);
}
n_written=write(fd,buf,10);
if(n_written== -1){
	fatal("blad w write");
	exit(1);
}
      druk(buf);
    pid1=fork();
if(pid1==0){
n_read = read(fd, buf, MAX);
n_written=write(fd,buf,10);
if(n_read== -1){
	fatal("blad w read");
	exit(1);
}
n_written=write(fd,buf,MAX);
if(n_written== -1){
	fatal("blad w write");
	exit(1);
}
druk(buf);
}
}