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From: mikel@codas.ATT.UUCP (Mikel Manitius)
Newsgroups: net.unix,net.unix-wizards
Subject: Re: Not a typewriter
Message-ID: <564@codas.ATT.UUCP>
Date: Wed, 18-Jun-86 10:10:44 EDT
Article-I.D.: codas.564
Posted: Wed Jun 18 10:10:44 1986
Date-Received: Fri, 20-Jun-86 01:49:22 EDT
References: <1683@homxb.UUCP> <542@codas.ATT.UUCP> <717@axis.UUCP>
Organization: AT&T Information Systems, Altamonte Springs, FL
Lines: 18
Xref: watmath net.unix:8231 net.unix-wizards:18462

>>>What does the sys_errlist message 'Not a typewriter' *really* mean??
>>
>>I think there may be one or two system calls that will alter
>>errno to be 25, without returning a non-zero value, when in
>>fact there was no error.
>>                                     Mikel Manitius
> 
>This is true. *However*, if you look at the documentation *carefully*, you
>will find that it says that errno is only valid if the system call preceeding
>it returned an error value.

Well, there is an exception. 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.
-- 
			Mikel Manitius @ AT&T-IS Altamonte Springs, FL
			...{seismo!akgua|ihnp4|cbosgd}!codas!mikel.ATT.UUCP