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List: dragonfly-bugs
Subject: [DragonFlyBSD - Bug #3216] (Resolved) Hang in tcdrain(3) after write(3)
From: bugtracker-admin () leaf ! dragonflybsd ! org
Date: 2019-11-28 2:01:35
Message-ID: redmine.journal-13839.20191128020135.46f31e0952301ea7 () leaf ! dragonflybsd ! org
[Download RAW message or body]
Issue #3216 has been updated by liweitianux.
Status changed from New to Resolved
Duplicate of bug #3215, so close this one.
----------------------------------------
Bug #3216: Hang in tcdrain(3) after write(3)
http://bugs.dragonflybsd.org/issues/3216#change-13839
* Author: noloader
* Status: Resolved
* Priority: Normal
* Assignee:
* Category:
* Target version:
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Hi Everyone,
I'm testing some software on DragonFly. There's not much to it. It
talks to the modem, and sends an ATZ and then reads the response.
Linux, FreeBSD, NetBSD, OpenBSD and OS X are OK.
My test rig is DragonFly 5.6-RELEASE x86_64 (fully patched) with a
USR5637 modem, https://www.amazon.com/gp/product/B0013FDLM0. The modem
is located at /dev/cuaU0.
DragonFly hangs on the call to tcdrain(3). Looking at the man page I
don't see any special handling. Cf.,
http://man.dragonflybsd.org/?command=tcdrain.
Attached is the reproducer. The trace is:
% ./test.exe
Setting TIOCEXCL
Getting tty
Setting tty options
Flushing tty
Setting tty
Writing ATZ
Waiting for write <<-- call to tcdrain(fd)
Thanks.
---Files--------------------------------
modem-read.c (2.85 KB)
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