Berkeley Sockets in C

main.c

#include <sys/socket.h>
#include <netdb.h>

#define BACKLOG 10
#define PORT 8080

int main(void)
{
    int sockfd, new_fd, sin_size;
    struct sockaddr_in server, client;

    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(PORT);

    if ((sockfd = socket(server.sin_family, SOCK_STREAM, 0)) == -1)
    {
        perror("socket");
        return 2;
    }
    if (bind(sockfd, (struct sockaddr *)&server, sizeof(server)) < 0)
    {
        perror("bind");
        return 2;
    }
    if (listen(sockfd, BACKLOG) == -1)
    {
        perror("listen");
        return 2;
    }

    char msg[] = "HTTP/1.1 200 OK\r\n"
                 "content-type: text/plain\r\n"
                 "content-length: 13\r\n"
                 "\r\n"
                 "Hello, world!";

    while (1)
    {
        sin_size = sizeof client;
        new_fd = accept(sockfd, (struct sockaddr *)&client, &sin_size);
        if (new_fd == -1)
        {
            perror("accept");
            continue;
        }
        if (send(new_fd, msg, strlen(msg), 0) == -1)
            perror("send");

        close(new_fd);
    }

    return 0;
}

This is a great resource http://beej.us/guide/bgnet/html/