#include<sys/socket.h>
#include<sys/types.h>
#include<netinet/ip.h>
#include<arpa/inet.h>
#include<stdio.h>
#include<unistd.h>
#include<signal.h>

int main(int argc, char ** argv){
	struct sockaddr_in sad;
	sad.sin_port = htons(5111);
	sad.sin_addr.s_addr = INADDR_ANY;
	sad.sin_family = AF_INET;

	int skt = socket(AF_INET, SOCK_STREAM, 0); // Step 1
	if(skt == -1){
		perror("socket");
		return 1;
	}
	if( bind(skt, (struct sockaddr *)(&sad), sizeof(struct sockaddr_in)) ){ // step 2
		perror("bind");
		return 1;
	}
	if( listen(skt, 5) ){ // step 3
		perror("listen");
		return 1;
	}	
	int client_fd;
	struct sockaddr_in client_address;
	socklen_t address_size = sizeof(struct sockaddr_in);
	client_fd = accept(skt, (struct sockaddr *)(&client_address), &address_size); // step 4
	printf("Connection made from address %s\n", inet_ntoa(client_address.sin_addr));
	char buffer[1024];
	while(1){
		ssize_t readlen = recv(client_fd, buffer, 5, MSG_DONTWAIT);
		if(readlen == -1){
			printf("No data available, sleeping for 1 second\n");
			sleep(1);
		}
		else {
			printf("Received:  %s (%d bytes)\n", buffer, readlen);
			break;
		}
	}
	close(client_fd);
	
	return 0;
}