A C TCP connect with TCP_NODELAY & TCP_QUICKACK options

connect.c

#include <errno.h>
#include <linux/tcp.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>

int main()
{
    const char*      hostname = "216.58.195.68"; 
    const char*      portname = "http";
    struct addrinfo  hints;
    struct addrinfo* res = 0;
    int              err;
    int              fd;
    int              one = 1;

    memset(&hints, 0, sizeof(hints));
    hints.ai_family =   AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = 0;
    hints.ai_flags =    AI_ADDRCONFIG;

    err = getaddrinfo(hostname, portname, &hints, &res);
    if (err != 0) {
        fprintf(stderr, "failed to resolve remote socket address (err=%d)",err);
        exit(1);
    }

    fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
    if (fd == -1) {
        fprintf(stderr, "%s\n", strerror(errno));
        exit(1);
    }

    err = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one)); 
    if (err != 0) {
        fprintf(stderr, "Could not setsockopt: %s\n", strerror(errno));
        exit(1);
    }

    err = setsockopt(fd, IPPROTO_TCP, TCP_QUICKACK, &one, sizeof(one)); 
    if (err != 0) {
        fprintf(stderr, "Could not setsockopt: %s\n", strerror(errno));
        exit(1);
    }

    if (connect(fd,res->ai_addr, res->ai_addrlen) == -1) {
        fprintf(stderr, strerror(errno));
        exit(1);
    }

    write(fd, "GET / HTTP/1.0\n\r\n\r", 18); 

    close(fd);
}