Prime Numbers - CLIENT

#include <stdio.h>
#include <limits.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/wait.h>
int main( void )
{
    FILE *stream;
    char buffer[LINE_MAX];
    int run;
    int empty( char* );
    if( (stream = fopen( "channel","r+" ) ) )
        {
            run=1;
        }
    else
        {
            run=0;
            perror( "!.!..błąd otwarcia łącza..!.!" );
        }

    printf("%s\n", "Ile liczb pierwszych chcesz?");
    int N;
    scanf("%d",&N);
    printf("%s %d %s\n", "Wybrales ",N," liczb losowych.");
    fprintf(stream, "%d\n", N);


    fflush(stream);
    sleep(1);
    while( run )
    {


        if( fgets( buffer,256,stream ) )
        {
            //int* pierwsze[N];
            //sscanf(buffer,"%d\n",);

            printf("%s\t%s\n",":: FROM SERVER:",buffer);


            fflush( stream );
        }

    }

    return 0;
}

int empty( char * string )
{
    while( *string )
        {
            if( isalnum(*string++) )
                {
                    return 0;
                }
        }
    return 1;
}