#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>

#define PORT 11011

int main () {
   struct sockaddr_in address = {0};
   address.sin_family = AF_INET;
   address.sin_addr.s_addr = htonl(INADDR_ANY);
   address.sin_port = htons(PORT);

   int sfd = socket(PF_INET, SOCK_STREAM, 0);
   int optval = 1;
   if (sfd < 0 ||
        setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR,
	           &optval, sizeof optval) < 0 ||
        bind(sfd, (struct sockaddr *) &address,
             sizeof address) < 0 ||
        listen(sfd, SOMAXCONN) < 0) {
      perror("socket"); exit(1);
   }

   int fd;
   while ((fd = accept(sfd, 0, 0)) >= 0) {
      char timebuf[32]; time_t clock; time(&clock);
      ctime_r(&clock, timebuf, sizeof timebuf);
      write(fd, timebuf, strlen(timebuf)); close(fd);
   }
}