Re: "test -c com1" hangs on some WinXP systems

[Larry Hall <cygwin-lh at cygwin dot com>]

At 04:31 PM 3/24/2004, you wrote:
>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
>


"com" is a reserved name in Windows.  It's best to steer clear of it in 
any context you can.  You may be catching it in your "if test -c com1"
version.


--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     


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