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Date: Wed, 24 Mar 2004 13:31:50 -0800 (PST)
From: "Curt, WE7U" <archer AT eskimo DOT com>
Reply-To: "Curt Mills, WE7U" <archer AT eskimo DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: "test -c com1" hangs on some WinXP systems
In-Reply-To: <Pine.SUN.4.58.0403241253000.26969@eskimo.com>
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References: <Pine DOT SUN DOT 4 DOT 58 DOT 0403241253000 DOT 26969 AT eskimo DOT com>
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On Wed, 24 Mar 2004, Curt, WE7U wrote:

> Our application runs on multiple OS'es.  A few of our WinXP users
> (and perhaps Win2k, can't remember) have had "if test -c com1" hang
> during our configure stage.
>
> We've already figured out that we should be using "/dev/ttyS0"
> instead of "com1", and have switched to that.  Because of the hang
> we're trying "if test -d /proc/registry as the test".  If
> /proc/registry is found, we skip the file test for the serial device
> on Cygwin boxes, thereby avoiding the hang.
>
> Excerpt (the version that hangs sometimes):
>
>
>   AC_DEFUN([XASTIR_DETECT_DEVICES],
>   [
>   AC_MSG_CHECKING([for devices])
>   if test -c com1 ; then
>   ac_tnc_port=com1
>   ac_gps_port=com2
>   elif test -c /dev/cuaa0 ; then
>   ac_tnc_port=/dev/cuaa0
>   ac_gps_port=/dev/cuaa1
>
>
> New improved version:
>
>
>   AC_DEFUN([XASTIR_DETECT_DEVICES],
>   [
>   AC_MSG_CHECKING([for devices])
>   if test -d /proc/registry ; then
>   ac_tnc_port=/dev/ttyS0
>   ac_gps_port=/dev/ttyS1
>   elif test -c /dev/cuaa0 ; then
>   ac_tnc_port=/dev/cuaa0
>   ac_gps_port=/dev/cuaa1
>
>
> Should "if test -c com1" or "if test -c /dev/ttyS0" work on Cygwin
> across all Windows platforms it supports?
>
> We'd rather do "if test -c /dev/ttyS0" if possible, so that it's
> similar across all platforms we support.

I should have completed more of the function above, as it's possible
that it is one of the other tests that hangs on Cygwin/WinXP.
Unlikely, but possible.  I expect it hangs on the first test for
"com1".  Tack the following code onto the end of either code example
above:


  elif test -c /dev/ttyS0 ; then
  ac_tnc_port=/dev/ttyS0
  ac_gps_port=/dev/ttyS1
  elif test -c /dev/cua/a ; then
  ac_tnc_port=/dev/cua/a
  ac_gps_port=/dev/cua/b
  else
  ac_tnc_port=none
  ac_gps_port=none
  fi


--
Curt, WE7U			    archer at eskimo dot com
Arlington, WA, USA		http://www.eskimo.com/~archer
"Lotto:    A tax on people who are bad at math." -- unknown
"Windows:  Microsoft's tax on computer illiterates." -- WE7U
"The world DOES revolve around me:  I picked the coordinate system!"

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