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Date: Tue, 23 Feb 2010 09:24:49 -0500
From: Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: FIONREAD on ttyS0
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References: <4B83E080 DOT 4040607 AT cuba DOT ionum DOT ch>
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On Tue, Feb 23, 2010 at 03:04:48PM +0100, q0082 AT cuba DOT ionum DOT ch wrote:
>ioctl(fd, FIONREAD, &bytes) gives me errno 88 (fd is a handle on ttyS0). 
>Is FIONREAD for serial tty not implemented?

From /usr/include/sys/errno.h:

#define ENOSYS 88       /* Function not implemented */

So the answer is no it is not implemented.

cgf

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