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

int main(int argc, char ** argv){
	struct sockaddr_in sad;
	sad.sin_port = htons(5141);
	sad.sin_addr.s_addr = INADDR_ANY;
	sad.sin_family = AF_INET;

	int skt = socket(AF_INET, SOCK_STREAM, 0);
	bind(skt, (struct sockaddr *)(&sad), sizeof(struct sockaddr_in));
	listen(skt, 5);
	int client_fd;
	struct sockaddr_in client_address;
	socklen_t address_size = sizeof(struct sockaddr_in);
	for(;;){
		client_fd = accept(skt, (struct sockaddr *)(&client_address), &address_size);
		int32_t a, b;
		size_t readlen = recv(client_fd, &a, sizeof(int32_t), MSG_WAITALL);
		readlen += recv(client_fd, &b, sizeof(int32_t), MSG_WAITALL);
		printf("readlen = %lu\n", readlen);
		int32_t answer = a + b;
		write(client_fd, &answer, sizeof(answer));

		printf("Connection made from address %s\n", inet_ntoa(client_address.sin_addr));
		close(client_fd);
	}
	return 0;
}