FIFO signaling producer that consumer has drained all bytes in pipe

[Jason Mehrens]

I'm proposing that FileChannel should do what is done here:
http://hg.openjdk.java.net/jdk/jdk/file/1871c5d07caf/src/java.base/unix/native/libjava/io_util_md.c#l193

________________________________________
From: Florian Weimer <fw at deneb.enyo.de>
Sent: Sunday, August 30, 2020 12:14 PM
To: Jason Mehrens
Cc: nio-dev at openjdk.java.net
Subject: Re: FIFO signaling producer that consumer has drained all bytes in pipe

* Jason Mehrens:

> 2. FileChannel::size always returns zero.  It would be much nicer if
> FileChannel::size returned bytes available.

Do you mean the data provided by the FIONREAD ioctl?  Is that even
portable?