server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>

#define PORT 8080
#define BUFFER_SIZE 1024

int server_fd;

void handle_sigint(int sig) {
    printf("\nShutting down server...\n");
    close(server_fd);
    exit(0);
}

int main() {
    int client_fd;
    struct sockaddr_in server_addr, client_addr;
    socklen_t client_len = sizeof(client_addr);
    char buffer[BUFFER_SIZE] = {0};
    
    signal(SIGINT, handle_sigint);
    
    // Create socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // Allow socket reuse
    int opt = 1;
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    
    // Configure server address
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = INADDR_ANY;
    server_addr.sin_port = htons(PORT);
    
    // Bind socket
    if (bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    
    // Listen for connections
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    
    printf("HTTP Server listening on port %d\n", PORT);
    
    while (1) {
        // Accept connection
        if ((client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &client_len)) < 0) {
            perror("accept");
            continue;
        }
        
        // Read request
        read(client_fd, buffer, BUFFER_SIZE);
        printf("Request received:\n%s\n", buffer);
        
        // Prepare HTTP response
        const char *response = 
            "HTTP/1.1 200 OK\r\n"
            "Content-Type: text/plain\r\n"
            "Content-Length: 13\r\n"
            "Connection: close\r\n"
            "\r\n"
            "Hello, World!";
        
        // Send response
        send(client_fd, response, strlen(response), 0);
        
        // Close connection
        close(client_fd);
    }
    
    return 0;
}