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From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: "fatal IO error 32" problems in Sun Server
Message-ID: <8911011316.AA02493@expire.lcs.mit.edu>
Date: 1 Nov 89 13:16:49 GMT
References: <3947@rtech.rtech.com>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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    But sometimes there is no I/O to be written, and so iovCnt==0. The
    writev routine doesn't like this, and fails with an error (EINVAL) because
    of invalid arguments.

Yup, there was such a bug in R3, and it is fixed in R4.  Your workaround
should do the job.