/*
** tcp_server.c -- a tcp socket server demo
*/

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

#define MYPORT 3490	// the port users will be connecting to

#define BACKLOG 10	 // how many pending connections queue will hold

int main(void)
{
	int sockfd, new_fd;  // listen on sock_fd, new connection on new_fd
	struct sockaddr_in my_addr;	// my address information
	struct sockaddr_in their_addr; // connector's address information
	socklen_t sin_size;

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		exit(1);
	}

	my_addr.sin_family = AF_INET;		 // host byte order
	my_addr.sin_port = htons(MYPORT);	 // short, network byte order
	my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my IP
	memset(my_addr.sin_zero, '\0', sizeof my_addr.sin_zero);

	if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof my_addr) == -1) {
		perror("bind");
		exit(1);
	}

	if (listen(sockfd, BACKLOG) == -1) {
		perror("listen");
		exit(1);
	}

	while(1) {  // main accept() loop
		sin_size = sizeof their_addr;
		if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size)) == -1) {
			perror("accept");
			continue;
		}
		printf("tcp_server: got connection from %s\n",inet_ntoa(their_addr.sin_addr));
		if (send(new_fd, "Hello, world!\n", 14, 0) == -1)
			perror("send");
		close(new_fd);
	}

	return 0;
}