#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <signal.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/time.h>
#include <errno.h>
#include <fcntl.h>

static int AT = 5; /* usecs for _ualarm to */

int nonblocking(int fd){
    int fb = fcntl(fd, F_GETFL, 0);
    if (fb == -1)
        return -1;
    return fcntl(fd, F_SETFL, fb|O_NONBLOCK);
}

void sigalrm(int arg){
  ualarm(AT,0);
}

int try_connect(){
  int s,c;
  struct sockaddr_in serv;
  memset(&serv,0,sizeof(serv));
  s = socket(PF_INET,SOCK_STREAM,6);
  nonblocking(s);
  serv.sin_family = AF_INET;
  serv.sin_port = htons(80);
  inet_aton("127.0.0.1",(struct in_addr*)&serv.sin_addr);
  c = connect(s,(struct sockaddr*)&serv,sizeof(serv));
  if( c < 0 && errno == EINTR )
    perror("connect (EINTR):"); // this is 
  return c;
}

int main( int argc, char** argv ){
  signal(SIGALRM,sigalrm);
  ualarm(AT,0);
  while(1){
    try_connect();
    if( errno == EBADF ){
      break;
    }
    sleep(100); // this sleep never really sleeps 100 secs.
  }
  puts("ran out of file descriptors as expected.");
  return 0;
}