cygwin error device or resource busy Post: 302353573

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Special Forums UNIX Desktop Questions & Answers cygwin error device or resource busy Post 302353573 by Corona688 on Tuesday 15th of September 2009 04:41:28 PM

09-15-2009

Registered User

Remember, Cygwin is still subject to silly Windows limitations like two programs not being able to open one port. bash can't open a file for reading and writing simultaneously, so bash can't do it by itself. I'm trying to think of a common shell utility to do this or some way to trick bash into it but so far I'm coming up empty... There's things like minicom, but I'm guessing you want to automate something.

You could use putty if just typing in raw commands is what you want. It's what I use for raw serial port communication in UNIX, and there's a native Windows version with precisely the same functionality.

Or... It's entirely possible your phone doesn't have the control signals to tell it when the connection's broken, so that closing the device file doesn't lose anything. You might be able to

Code:

echo "AT" > /dev/ttyS0
cat /dev/ttyS0

if you set it up with stty correctly first. There's a setting in stty somewhere to define the amount of time to wait before closing the connection. Set it to zero(or just something small) and it gives you only what's in the buffer, which lets you just keep reopening and reclosing it whenever you want to read or write. I've used this feature in actual UNIX, but I don't know if Windows will do this properly -- it might just discard everything while the file's closed.

---------- Post updated at 02:41 PM ---------- Previous update was at 02:11 PM ----------

I finally figured it out, maybe. Try this:

Code:

# Open ttyS2 for reading and writing as FD 5
exec 5<>/dev/ttyS2
# Leave this running in the background
cat <&5 &
# Write a command to FD 5
echo "AT" >&5

Windows may still complain. I'm not sure.

Last edited by Corona688; 09-15-2009 at 05:19 PM..

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bluetoothd

BLUETOOTHD(8)						    System management commands						     BLUETOOTHD(8)

NAME

       bluetoothd - Bluetooth daemon

SYNOPSIS

       bluetoothd [ -n ]

DESCRIPTION

       This  manual page documents briefly the bluetoothd daemon, which manages all the Bluetooth devices.  bluetoothd itself does not accept many
       command-line options, as most of its configuration is done in the /etc/bluetooth/main.conf file, which has its own  man	page.	bluetoothd
       can also provide a number of services via the D-Bus message bus system.

OPTIONS

       -n     Don't run as daemon in background.

       -d     Enable debug information output.

       -m mtu-size
	      Use specific MTU size for SDP server.

FILES

       /etc/bluetooth/main.conf
	      Default location of the global configuration file.

       /var/lib/bluetooth/nn:nn:nn:nn:nn:nn/linkkeys
	      Default  location  for  link keys of paired devices. The directory nn:nn:nn:nn:nn:nn is the address of the local device. The file is
	      line separated, with the following columns separated by whitespace:

	      nn:nn:nn:nn:nn:nn Remote device address.

	      nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn Link key.

	      n Link type integer.

       /var/lib/bluetooth/nn:nn:nn:nn:nn:nn/names
	      Default location for the device name cache. The directory nn:nn:nn:nn:nn:nn is the address of the local device.  The  file  is  line
	      separated, with the following columns separated by whitespace:

	      nn:nn:nn:nn:nn:nn Remote device address.

	      name Remote device name, terminated with newline.

       /var/lib/bluetooth/nn:nn:nn:nn:nn:nn/features
	      Default  location for the features cache. The directory nn:nn:nn:nn:nn:nn is the address of the local device. The file is line sepa-
	      rated, with the following columns separated by whitespace:

	      nn:nn:nn:nn:nn:nn Remote device address.

	      nnnnnnnnnnnnnnnn Remote device LMP features coded as an 8 byte bitfield.

       /var/lib/bluetooth/nn:nn:nn:nn:nn:nn/manufacturers
	      Default location for the manufacturers cache. The directory nn:nn:nn:nn:nn:nn is the address of the local device. The file  is  line
	      separated, with the following columns separated by whitespace:

	      nn:nn:nn:nn:nn:nn Remote device address.

	      n Remote device manufacturer integer.

	      n Remote device LMP version integer.

	      n Remote device LMP sub-version integer.

AUTHOR

       This manual page was written by Marcel Holtmann, Philipp Matthias Hahn and Fredrik Noring.

Bluetooth daemon						    March 2004							     BLUETOOTHD(8)