From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Jacobowitz <dmj+@andrew.cmu.edu>
To: gdb@sources.redhat.com
Subject: gdbserver vs. serial ports
Date: Thu, 12 Jul 2001 11:20:00 -0000
Message-id: <20010712112040.A8123@nevyn.them.org>
X-SW-Source: 2001-07/msg00117.html

I see that in remote-utils.c, we deliberately set VMIN and VTIME to 0 if we
open a serial port.  On an i386-linux (2.4) host, this has the effect of
making read() return 0 if no data is available.  We see the 0 and
immediately decide that it's an EOF, and close/reopen the serial port.

I don't have a lot of experience with serial programming.  Should we be
setting VMIN differently, or should we treat read() returning 0 differently? 
It looks like ser-unix.c treats them read() returning 0 as a timeout and
sets VMIN appropriately before calling read().  Which raises the question -
does anyone know if gdbserver actually worked over serial ports? :)

-- 
Daniel Jacobowitz                           Carnegie Mellon University
MontaVista Software                         Debian GNU/Linux Developer