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From:	kremser AT sbox DOT tu-graz DOT ac DOT at (Herbert Kremser)
Newsgroups:	comp.os.msdos.djgpp
Subject:	need something better than kbhit()
Date:	25 Oct 1995 01:49:12 GMT
Organization:	Graz University of Technology, Austria
Lines:	44
Nntp-Posting-Host:	freelove.tu-graz.ac.at
To:	djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway:	from newsgroup comp.os.msdos.djgpp

How can you determine if something is available at stdin?
I rather need a nonblocking input function.

kbhit() doesn't work, since it checks the real keyboard, not the
(buffered) stdin descriptor.

What i need is something like:

for (;;)
  {
  if (something_in_input)
    {
    read(0, buf, 256);
    /* queue that input */
    }
  /* do something here */
  }

or maybe something similar to:

fcntl(0, F_SETFL, O_NDELAY);  /* make stdin nonblocking */
for (;;)
  {
  r_read = read(0, buf, 256);
  if (r_read < 0)
    {
    if (errno == EWOULDBLOCK)
      /* thats ok */ ;
    else
      /* report that error */
    }
  /* do something here */
  }

I have no idea how to achieve either of this approaches with djgpp,
by reading the faq and documentation.
So many thanks for leading a djgpp newbie on the right path.  :-)

Herbert

-- 
Herbert Kremser                                      |  "On the Internet,
kremser AT flinux DOT tu-graz DOT ac DOT at                         |   nobody knows
kremser AT sbox DOT tu-graz DOT ac DOT at                           |   you're a dog." 

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