From: Thomas Dickey <dickey@his.com>
To: "Åke Rehnman" <ake.rehnman@gmail.com>
Cc: cygwin <cygwin@cygwin.com>
Subject: Re: Setting termios VMIN > 0 and VTIME > 0 on non blocking file
Date: Thu, 12 Mar 2020 04:05:56 -0400 (EDT) [thread overview]
Message-ID: <791909910.16332184.1584000356533.JavaMail.zimbra@his.com> (raw)
In-Reply-To: <9e4c6428-59de-df07-9e33-44ba95d5497f@gmail.com>
----- Original Message -----
| From: "Åke Rehnman" <ake.rehnman@gmail.com>
| To: "cygwin" <cygwin@cygwin.com>
| Sent: Wednesday, March 11, 2020 4:48:05 PM
| Subject: Setting termios VMIN > 0 and VTIME > 0 on non blocking file
| Hello all,
|
| opening a file (serial port) with O_NONBLOCK and subsequently setting
| termios VMIN and VTIME > 0 makes read() never ever return any data
| (returns EAGAIN indefinitely).
|
| Don't ask my why one would want to do something like this but apparently
| the "screen" program think this is a good way of doing things...
|
| Nevertheless not returning any data ever seems wrong.
|
| Any insight on how it is supposed to work is welcome.
If not "correct", it's certainly inconsistent with all other systems.
I noticed it recently:
https://invisible-island.net/ncurses/tack/CHANGES.html#t20200220
https://github.com/cygwinports/tack/issues/1
It's either recently-broken, or just coincidence :-)
--
Thomas E. Dickey <dickey@invisible-island.net>
http://invisible-island.net
ftp://ftp.invisible-island.net
next prev parent reply other threads:[~2020-03-12 8:05 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.1473.1583981776.15804.cygwin@cygwin.com>
2020-03-11 20:48 ` Åke Rehnman
2020-03-11 21:55 ` Brian Inglis
2020-03-12 1:01 ` Norton Allen
2020-03-12 1:04 ` Åke Rehnman
2020-03-12 1:08 ` Norton Allen
2020-03-12 1:39 ` Åke Rehnman
2020-03-12 8:05 ` Thomas Dickey [this message]
2020-03-12 11:01 ` Åke Rehnman
2020-03-12 19:48 ` Achim Gratz
2020-03-12 11:40 ` Corinna Vinschen
2020-03-12 13:32 ` Åke Rehnman
2020-03-12 14:13 ` Corinna Vinschen
2020-03-12 16:42 ` Åke Rehnman
2020-03-13 10:02 ` Corinna Vinschen
2020-03-12 14:20 ` Åke Rehnman
2020-03-12 14:44 ` Corinna Vinschen
2020-03-12 15:08 ` Corinna Vinschen
2020-03-12 17:04 ` Åke Rehnman
2020-03-13 10:12 ` Corinna Vinschen
2020-03-14 10:23 ` Åke Rehnman
2020-03-14 10:36 ` Åke Rehnman
2020-03-16 9:35 ` Corinna Vinschen
2020-03-17 12:16 ` Corinna Vinschen
2020-03-17 15:54 ` Åke Rehnman
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