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Date: Fri, 30 Mar 2001 10:45:32 -0500
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin-developers AT cygwin DOT com
Subject: Re: clearerr
Message-ID: <20010330104532.D12718@redhat.com>
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References: <02ff01c0b916$66480970$0200a8c0 AT lifelesswks>
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In-Reply-To: <02ff01c0b916$66480970$0200a8c0@lifelesswks>; from robert.collins@itdomain.com.au on Fri, Mar 30, 2001 at 09:33:49PM +1000

On Fri, Mar 30, 2001 at 09:33:49PM +1000, Robert Collins wrote:
>I'm confused - newlib's clearerr calls __sclearerr, but I can't find
>that anywhere. cygwin.dindefines clearerr and _clearerr, but I can't
>find them in the source..
>
>In testing the fifo semantics, I've found that the expected behaviour
>for a fifo on freeBSD is that clearerr() should re-open the fifo,
>allowing further writes to take take place..
>
>i.e.
>
>a reader can loop
>clearerr()
>read to eof
>
>and the pipe can have multiple separate writers write to the pipe and
>exit. Without clearerr or a rewind(), the pipe gets marked eof and stays
>eof.
>
>most OS's seem to simply use rewind() to the same effect, so I'm
>implementing that. The question I have is: will clearerr() actually call
>any cygwin code?

Why are you asking a question like this which is so easily verified by
a simple test case?  gdb is your friend.

cgf