//#include <errno.h>
//#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

// accept
// atoi
// bind
// bzero
// calloc
// close
// exit
// free
// listen
// malloc
// memset
// realloc
// recv
// select
// send
// socket
// sprintf
// strcat
// strcpy
// strlen
// strstr
// write

void putstr(int fd, char *str) {
	write(fd, str, strlen(str));
}

void error(char *str) {
	putstr(2, str);
	exit(1);
}

int main(int ac, char **av) {
	int									port;
	int									server_fd;
	int									client_fd;
	char								buf[1024];
	struct sockaddr_in	addr;
	socklen_t						len;
	fd_set							fds;

	if (ac != 2)
		error("Wrong number of arguments\n");
	if ( (port = atoi(av[1])) == -1)
		error("Fatal error\n");

	if ( (server_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
		error("Fatal error\n");
	bzero(&addr, sizeof(addr));
	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = htonl(2130706433); //127.0.0.1
	addr.sin_port = htons(port);

	len = sizeof(addr);
	if (bind(server_fd, (const struct sockaddr *)&addr, len) == -1)
		error("Fatal error\n");
	if (listen(server_fd, 10) == -1)
		error("Fatal error\n");

	while (1) {
		if ( (client_fd = accept(server_fd, (struct sockaddr *)&addr, &len)) == -1)
			error("Fatal error\n");
		FD_ZERO(&fds);
		FD_SET(client_fd, &fds);
		select(client_fd + 1, &fds, NULL, NULL, NULL);
		if (FD_ISSET(client_fd, &fds))
			recv(client_fd, buf, 1024, 0);
	}
	return (0);
}