"test -c com1" hangs on some WinXP systems

["Curt, WE7U" <archer at eskimo dot com>]

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.

--
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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