linux-kernel - Re: ttyS0 stuck in tty_wait_until_sent when sending break (opened with O

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Message-ID: <CAB1b2sjuqzVMrsomwfx0AqtCezcNGnQs1OxNXDUUep4JdyYUBQ@mail.gmail.com>
Date:	Tue, 15 Nov 2011 20:02:58 +0100
From:	Domen Puncer <domen@....si>
To:	linux-kernel@...r.kernel.org
Subject: Re: ttyS0 stuck in tty_wait_until_sent when sending break (opened
 with O_NONBLOCK)

On Sun, Nov 6, 2011 at 11:27, Domen Puncer <domen@....si> wrote:
> write(3, "\301", 1)                     = 1
> ioctl(3, TCSBRK <unfinished ...>
>

Traced this down to flow control. And ioctl(fd, TCSBRK, 1) is tcdrain,
so it waited.

Sorry for the noise.
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