socket_server.cpp

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

const int PORT = 8080;
const int BACKLOG = 5;

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);

    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT,
                                                  &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons( PORT );

    // Binding socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address,
                                 sizeof(address))<0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    // Listening for incoming connections
    if (listen(server_fd, BACKLOG) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    // Accepting incoming connections
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
                       (socklen_t*)&addrlen))<0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    // Handling incoming connection
    char buffer[1024] = {0};
    int valread;
    valread = read( new_socket , buffer, 1024);
    printf("%s\n",buffer );
    const char *hello = "Hello from server";
    send(new_socket , hello , strlen(hello) , 0 );
    printf("Hello message sent\n");
    return 0;
}