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From: ka@hropus.UUCP (Kenneth Almquist)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: Not a typewriter
Message-ID: <514@hropus.UUCP>
Date: Thu, 19-Jun-86 15:55:04 EDT
Article-I.D.: hropus.514
Posted: Thu Jun 19 15:55:04 1986
Date-Received: Sat, 21-Jun-86 07:33:34 EDT
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> If a read or write is interrupted by a signal, it will return 0 or
> number of bytes written before the interrupt occured.  In this case
> errno = 4, and no error code is returned from the system call.

I suspect you are misreading the documentation.  When a write system
call is interrupted, it may either return a short count or return -1.
Errno is set to 4 in the latter case.  I don't know of any version of
UNIX in which read will return zero when interrupted.
				Kenneth Almquist