Client, C++ (gcc) - rextester

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//
//  main.c
//  KnockKnockClient
//
//  Created by Steven Bagley on 11/11/2015.
//  Copyright © 2015 Brokentooth. All rights reserved.
//

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include "netinet/in.h"
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/socket.h>

#define kBufSize 12

int main(int argc, const char * argv[])
{
    char buf[kBufSize+1];
    char line[128];
    ssize_t n;
    int i;
    int more;

int sockFD;
    int port;
    struct sockaddr_in sad;
    struct hostent *ptrh;

sockFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);

memset(&sad, 0, sizeof(sad));                       /* Sets every byte of the address to be zero */
    sad.sin_family = AF_INET;

/* Look up name */
    ptrh = gethostbyname(argv[1]);
    memcpy(&sad.sin_addr, ptrh->h_addr, ptrh->h_length);

/* Set port */
    sscanf(argv[2], "%d", &port);
    sad.sin_port = htons(port);
    connect(sockFD, (struct sockaddr *)&sad, sizeof(sad));

do
    {
        /* Read input line */
        do
        {
            more = 1;
            n = read(sockFD, buf, kBufSize);
            buf[n] = '\0';

if(n <= 0)
                break;

for(i = 0; i < n; i++)
            {
                if(buf[i] == 10)
                {
                    more = 0;
                    break;
                }
            }

printf("%s", buf);
        } while(more);

if(n <= 0)
        {
            break;
        }

fgets(line, 120, stdin);
        line[strlen(line)-1] = 0;
        strcat(line, "\r\n");

write(sockFD, line, strlen(line));
    } while(n > 0);

close(sockFD);

return 0;
}

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Compilation time: 0.24 sec, absolute running time: 0.22 sec, cpu time: 0.15 sec, memory peak: 3 Mb, absolute service time: 0,46 sec