// Source: http://shirleyanengineer.blogspot.com/2019/11/socket-socket-programming-in-linux-os.html

#include <stdio.h>
#include <sys/socket.h> // AF_INET and SOCK_STREAM
#include <stdlib.h>     // EXIT_SUCCESS, EXIT_FAILURE
#include <netinet/in.h> // INADDR_ANY
#include <string.h>     // bzero
#include <unistd.h>     // read and write

#define PORT 8080

int main(int argc, char const *argv[]) {
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *hello = "Hello from server";

    // 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);

    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address,
             sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE); }
        
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE); }
        
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
                            (socklen_t*)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE); }
    valread = read (new_socket, buffer, 1024);
    printf("%s\n",buffer );
    //send(new_socket , hello , strlen(hello) , 0 );
    //printf("Hello message sent\n");
    return 0; }