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From: 02335%UWAV4.BITNET@wiscvm.ARPA
Newsgroups: net.lang.c
Subject: C prgram needed - read with timeout
Message-ID: <3092@brl-smoke.ARPA>
Date: Sat, 16-Aug-86 01:08:48 EDT
Article-I.D.: brl-smok.3092
Posted: Sat Aug 16 01:08:48 1986
Date-Received: Tue, 19-Aug-86 03:34:42 EDT
Sender: news@brl-smoke.ARPA
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Hi,

I have been working on an HP-9000 Unix machine trying to do a read that
does not wait for a RETURN.  One character is all I need, but there doesn;t
seem to be a C function to do this.  I've looked at the IOCTL stuff, but the
timeout doesn't work until after one character has been pressed.  I did
get something to work setting the O_NDELAY bit with FCNTL, but there is no
way to unset that bit so when I exit the program I get logged out since
UNIX timeouts and all other reads timeout as well.

I eventually wrote an interrupt handler using SIGNAL.  But I really
need to trap and return any character being pressed not just the DELETE key.

My main program is really in FORTRAN, but I'm pretty sure that I must
call a C routine to get the job done if it is possible.  I am really a
Vax FORTRAN programmer which has no problem polling the keypboard, so I
am a little amused that C doesn't seem to have this capability.

Any help would be greatly appreciated...  Please reply directly to me since
I do not get INFO-C mail.

Thanks in advance,
Tony Andrea
Sierra Geophysics, Inc.
Kirkland, Washington

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