training_repo/non_blocking_client/server.c

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 12345
#define BUFFER_SIZE 1024

int main() 
{
    int server_socket, client_socket;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_addr_len;
    char buffer[BUFFER_SIZE];
    if ((server_socket = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }
    // Define server address
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT); 
    // Bind the socket to the address and port
    if (bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) 
    {
        perror("Bind failed");
        close(server_socket);
        exit(EXIT_FAILURE);
    }
    // Listen for incoming connections
    if (listen(server_socket, 5) < 0)
    {
         perror("Listen failed");
        close(server_socket);
        exit(EXIT_FAILURE);
    }
    printf("Server listening on port %d...\n", PORT);
    // Accept incoming client connection
    client_addr_len = sizeof(client_addr);
    if ((client_socket = accept(server_socket, (struct sockaddr *)&client_addr, &client_addr_len)) < 0)
    {
        perror("Client connection failed");
        close(server_socket);
        exit(EXIT_FAILURE);
    }
    printf("Client connected. Waiting for message...\n");
    // Receive message from the client
    //int n = recv(client_socket, buffer, BUFFER_SIZE, 0);
    //if (n < 0)
   // {
     //   perror("Receive failed");
       // close(client_socket);
       // close(server_socket);
       // exit(EXIT_FAILURE);
     //}
    //buffer[n] = '\0';  // Null-terminate the received string
    //printf("Received from client: %s\n", buffer);
    // Send response to the client
    //const char *response = "Hello, Client! Your message was received.";
    //send(client_socket, response, strlen(response), 0);
   // printf("Response sent to client.\n");
    // Close the sockets
    close(client_socket);
    close(server_socket);
    return 0;
    }