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Message-ID: <20090610105118.564a53de@lxorguk.ukuu.org.uk>
Date: Wed, 10 Jun 2009 10:51:18 +0100
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: "Luke-Jr" <luke@...hjr.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: pty tcdrain() bug in 2.6.27 to 2.6.30/current
> manner. The following test case reproduces the bug, and hangs only on affected
> kernels. Examination of 2.6.26 and 2.6.27 suggests the ioctl used by tcdrain
> underwent a rewrite for 2.6.27, and thus fixing this bug is beyond my
> capabilities at this time.
I don't see a bug at this point
> slavefd = open(ptsname(masterfd), O_NOCTTY | O_RDWR);
> assert(slavefd != -1);
>
> assert(sizeof(test) == write(slavefd, test, sizeof(test)));
Queue data to the other end...
> assert(!tcdrain(slavefd));
Wait for it to be read, but with nothing reading it.
So it waits as it should.
What is the bug here ?
Alan
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