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Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!ncar!unmvax!tut.cis.ohio-state.edu!rutgers!bpa!cbmvax!vu-vlsi!devon!stb!michael
From: michael@stb.UUCP (Michael)
Newsgroups: unix-pc.general,comp.sys.att
Subject: Re: termio(7) and read(2) problem!
Message-ID: <10652@stb.UUCP>
Date: 7 Feb 89 22:50:56 GMT
References: <137@zebra.UUCP> <7411@chinet.chi.il.us>
Reply-To: michael@stb.UUCP (Michael)
Distribution: na
Organization: STB BBS, La, Ca, Usa, +1 213 459 7231
Lines: 23

In article <7411@chinet.chi.il.us> les@chinet.chi.il.us (Leslie Mikesell) writes:
>In article <137@zebra.UUCP> vern@zebra.UUCP (Vernon C. Hoxie) writes:
>>
>>	I have been trying to write a test program for a Trailblazer.
>>It is connected to /dev/tty000.  The program opens this file with:
>>
>>	fd = open("/dev/tty000", O_RDWR | O_NDELAY);
>
>You probably need to use fcntl() to turn off the O_NDELAY before
>trying to use the port (set CLOCAL first if you need it).  Write()s
>don't wait for the hardware to be ready if you leave O_NDELAY
>set and strange things happen.  I have seen code that indicated that
>a close(open(/dev/ttywhatever,2) was needed to force the mode to
>changed.  Does anyone know which versions of unix require this?
>
>Les Mikesell

Does anyone know how to turn ON NDELAY for an already open file?
			Michael
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: Michael Gersten			 uunet.uu.net!stb!michael
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: Coff Coff <=== Stop smoking.