From owner-freebsd-bugs@FreeBSD.ORG Fri Mar 12 15:20:01 2010 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E3EA3106566C for ; Fri, 12 Mar 2010 15:20:01 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id A6C848FC13 for ; Fri, 12 Mar 2010 15:20:01 +0000 (UTC) Received: from freefall.freebsd.org (localhost [127.0.0.1]) by freefall.freebsd.org (8.14.4/8.14.4) with ESMTP id o2CFK1Xx029957 for ; Fri, 12 Mar 2010 15:20:01 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.4/8.14.4/Submit) id o2CFK1mF029956; Fri, 12 Mar 2010 15:20:01 GMT (envelope-from gnats) Resent-Date: Fri, 12 Mar 2010 15:20:01 GMT Resent-Message-Id: <201003121520.o2CFK1mF029956@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Uniballer Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 861D4106564A for ; Fri, 12 Mar 2010 15:16:22 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21]) by mx1.freebsd.org (Postfix) with ESMTP id 748BE8FC13 for ; Fri, 12 Mar 2010 15:16:22 +0000 (UTC) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.14.3/8.14.3) with ESMTP id o2CFGMYc002634 for ; Fri, 12 Mar 2010 15:16:22 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.14.3/8.14.3/Submit) id o2CFGMKu002632; Fri, 12 Mar 2010 15:16:22 GMT (envelope-from nobody) Message-Id: <201003121516.o2CFGMKu002632@www.freebsd.org> Date: Fri, 12 Mar 2010 15:16:22 GMT From: Uniballer To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: misc/144696: tcdrain(3) does not work right with uart(4) driver X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 12 Mar 2010 15:20:02 -0000 >Number: 144696 >Category: misc >Synopsis: tcdrain(3) does not work right with uart(4) driver >Confidential: no >Severity: serious >Priority: high >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Mar 12 15:20:01 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Uniballer >Release: 8.0-RELEASE-p2 >Organization: >Environment: FreeBSD ????.xxxx.com 8.0-RELEASE-p2 FreeBSD 8.0-RELEASE-p2 #0: Tue Jan 5 16:02:27 UTC 2010 root@i386-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC i386 >Description: tcdrain(3) does not wait for serial output to complete when used with the uart(4) driver. This worked correctly on 6.4 and 7.x with the sio(4) driver. >How-To-Repeat: Loop back a serial port, write a long buffer to it, then call tcdrain(3) to wait for output to complete, and call tcflush(3) to get rid of the data. A subsequent read will show that part of the data is in the receive buffer, probably because it was received after tcflush(3) was called because tcdrain(3) was called early. See http://forums.freebsd.org/showthread.php?t=12154 for more info and sample code. >Fix: >Release-Note: >Audit-Trail: >Unformatted: