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From: carroll@cs.uiuc.edu (Alan M. Carroll)
Newsgroups: comp.unix.programmer
Subject: Re: How can I detect waiting characters in a curses application ?
Keywords: curses typeahead
Message-ID: <1990Dec6.234823.2763@ux1.cso.uiuc.edu>
Date: 6 Dec 90 23:48:23 GMT
References: <677@ntpdvp1.UUCP>
Sender: news@ux1.cso.uiuc.edu (News)
Reply-To: carroll@cs.uiuc.edu (Alan M. Carroll)
Organization: Technophiles Inc. - Engineers with Attitude
Lines: 38

In article <677@ntpdvp1.UUCP>, samc@ntpdvp1.UUCP (Sam Christie) writes:
> Would some kind sole tell me the name of the curses function
> which checks for input without blocking ? If none exists, then please
> read on and help me create one.
> 

Try this. (test by compiling and running. Type and hit return. Works
for me on ISC 2.0.2).

#include <stropts.h>
#include <poll.h>

int istypeahead(fd) int fd;		/* file descriptor */
{
  int n;
  struct pollfd p_fd[1];

  p_fd->fd = fd;
  p_fd->events = POLLIN;

  n = poll(p_fd, 1, 0);
  return n;
}

main()
{
  while (1)
    {
      if (istypeahead(0)) printf("Input waiting\n");
      else printf("No input\n");
      sleep(1);
    }
}

-- 
Alan M. Carroll                "It's psychosomatic. You need a lobotomy.
Epoch Development Team          I'll get a saw."
CS Grad / U of Ill @ Urbana    ...{ucbvax,pur-ee,convex}!cs.uiuc.edu!carroll