1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <sys/types.h>
   5 #include <sys/socket.h>
   6 #include <netinet/in.h>
   7 #include <arpa/inet.h>
   8 #include <assert.h>
   9 
  10 int
  11 main(int a, char **b)
  12 {
  13         struct sockaddr_in S;
  14         int s,t,x;
  15         s = socket(PF_INET, SOCK_STREAM, 0);
  16         assert(s > 0);
  17         memset(&S, '\0', sizeof(S));
  18         S.sin_family = AF_INET;
  19         S.sin_port = htons(80);
  20         x = bind(s, (struct sockaddr *) &S, sizeof(S));
  21         assert(x == 0);
  22         x = listen(s, 10);
  23         assert(x == 0);
  24         while (1) {
  25                 struct sockaddr_in F;
  26                 int fl = sizeof(F);
  27                 t = accept(s, (struct sockaddr *) &F, &fl);
  28                 fprintf(stderr, "accpeted FD %d from %s:%d\n",
  29                         t, inet_ntoa(F.sin_addr), (int)ntohs(F.sin_port));
  30                 close(t);
  31                 fprintf(stderr, "closed FD %d\n", t);
  32         }
  33         return 0;
  34 }