[lkml]   [2002]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] POLL_OUT in ttys, misc bug fix


Have you actually tested the SIGIO POLL_OUT changes with an userspace app?


On Wed, 27 Mar 2002, Sapan J . Bhatia wrote:

> Hello,
> While fixing a flow control bug that truncated output to a terminal in
> User Mode Linux, I noticed that the tty drivers only send POLL_IN on new
> data being available but not POLL_OUT when the device is ready for new
> data.
> This patch fixes the bug in the line discipline and the pty driver.
> Also, there's another minor bug in n_tty.c where write_chan returns
> on a (retvalue < 0) unconditionally. This is a problem, since the type of
> IO (BLOCKING / NON_BLOCKING) is stored in the tty, and if the console driver
> returns a -EAGAIN (eg. in UML on getting an EAGAIN from the host kernel),
> write_chan returns even in the case of a blocking write, which is wrong
> since the process doesn't expect it.
> Regards,
> Sapan

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:22    [W:0.048 / U:2.932 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site