How can I implement a TCP server in C++?

How can I implement a TCP server in C++?

To implement a TCP server in C++, you can use the sockets API. First, include the necessary headers like <sys/socket.h> and <netinet/in.h>. Then, create a socket using socket(), bind it to an address with bind(), and listen for incoming connections using listen(). Finally, accept connections with accept() and handle them in a loop.

What are the key functions I need to know for socket programming?

The key functions include socket(), bind(), listen(), accept(), recv(), send(), and close(). Each function plays a crucial role in establishing and managing socket connections.

Can you provide a simple code example for a TCP server?

Sure! Here's a basic example:

#include <iostream>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

int main() {
    int server_fd = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in address;
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(8080);
    bind(server_fd, (struct sockaddr *)&address, sizeof(address));
    listen(server_fd, 3);
    int new_socket = accept(server_fd, NULL, NULL);
    // Handle the connection
    close(new_socket);
    close(server_fd);
    return 0;
}

This code sets up a simple TCP server that listens on port 8080.

What are some common issues I might face while programming sockets?

Common issues include handling blocking calls, managing multiple connections, dealing with network errors, and ensuring proper cleanup of resources.