Date: Sun, 02 Aug 2009 07:50:41 -0500 From: Robert Noland <rnoland@FreeBSD.org> To: Ed Schouten <ed@80386.nl> Cc: Kostik Belousov <kostikbel@gmail.com>, FreeBSD Current <current@freebsd.org> Subject: Re: HEAD tty seems to drop characters Message-ID: <1249217441.1773.5.camel@balrog.2hip.net> In-Reply-To: <20090802123108.GY1292@hoeg.nl> References: <20090802105033.GG1884@deviant.kiev.zoral.com.ua> <20090802123108.GY1292@hoeg.nl>
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On Sun, 2009-08-02 at 14:31 +0200, Ed Schouten wrote: > Hi Kostik, > > * Kostik Belousov <kostikbel@gmail.com> wrote: > > I run a screen(1), where I tried to copy large portion of output and > > paste it into vi. This resulted in the loss of the characters at random > > points inside the pasted text. > > I already took some time to investigate the issue. I have attached a > patch that should already improve the situation: > > - write() on a pseudo-terminal master also accounted the data that was > read into the kernel, but couldn't be passed to the TTY (which is > likely to happen in non-blocking mode). > > - There was also a small unrelated issue; input on a TTY which has been > configured in block (bypass) mode wouldn't set the input high water > mark. > > For some reason, the data loss doesn't occur when SSHing to myself > multiple times, but still causes screen(1) to drop some bytes later on. > > Even though it's always very easy to blame other applications, I suspect > this may be because I reduced the input buffer size from 8 KB to 2 KB > per pseudo-terminal. Maybe screen(1) can't deal with this. To be > investigated... I'm pretty sure that I've seen this without screen involved. Just trying to cut / paste pkg-plist entries from an xterm or gnome-terminal (IIRC, I tried both) into vi. It worked as long as I took smaller chunks, but corrupted things if I tried to copy the whole plist in one shot. robert. -- Robert Noland <rnoland@FreeBSD.org> FreeBSD
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