Thread: how to include a "delay" in n/w progs

The select function tests for read/write/error conditions on file descriptors. Here's an example that waits 10 seconds for you to enter some data via STDIN, before giving up:
(its from the faq)

Code:

#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <stdio.h>

int main(void)
{
  fd_set          f;
  int             rc;
  char            buf[128];
  struct timeval  t;

t.tv_sec = 10;
  t.tv_usec = 0;

  /* set descriptor */
  FD_ZERO(&f);
  FD_SET(STDIN_FILENO, &f);

  rc = select(STDIN_FILENO + 1, &f, NULL, NULL, &t);
  if (rc == -1)
  {
    /* select( ) error */
  }
  else if (rc == 0)
  {
    /* no input available */
  }
  else if (FD_ISSET(STDIN_FILENO, &f))
  {
    rc = read(STDIN_FILENO, buf, 127);
    if (rc == -1)
    {
      /* read( ) error */
    }
    else
    {
      buf[rc] = 0;
      printf("%s", buf);
    }
  }
}