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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LEARN ABOUT CENTOS

reader.conf

READER.CONF(5)							    PC/SC Lite							    READER.CONF(5)

NAME

       reader.conf - configuration file for pcscd readers' drivers

DESCRIPTION

       The /etc/reader.conf.d/reader.conf file contains configuration information for serial and (some) PCMCIA smart card readers.

       USB readers SHALL NOT be configured using this file.  pcscd uses another mechanism to automatically load USB drivers.

SYNTAX

       The /etc/reader.conf.d/reader.conf is a regular text file. Each reader must be defined by four fields:

	FRIENDLYNAME	 TEXT_STRING
	DEVICENAME	 FILENAME
	LIBPATH 	 FILENAME
	CHANNELID	 NUMBER

       The "FRIENDLYNAME" field is an arbitrary text used to identify the reader. This text is displayed by commands like pcsc_scan(1) that prints
       the names of all the connected and detected readers.

       The "DEVICENAME" field was not used for old drivers (using the IFD handler version 2.0 or earlier). It is now  (IFD  handler  version  3.0)
       used  to  identify the physical port on which the reader is connected. This is the device name of this port. It is dependent of the OS ker-
       nel. The first serial port device is called /dev/ttyS0 under Linux and /dev/cuaa0 under FreeBSD.

       The "LIBPATH" field is the filename of the driver code. The driver is a dynamically loaded piece of code (generally a drivername.so*file).

       The "CHANNELID" is no more used for recent drivers (IFD handler 3.0) and has been superseded by "DEVICENAME". If you  have  an  old  driver
       this  field  is	used  to  indicate  the port to use. You should read your driver documentation to know what information is needed here. It
       should be the serial port number for a serial reader.

EXAMPLE

	# Gemplus GemPCTwin reader with serial communication
	# connected to the first serial port
	FRIENDLYNAME	  "GemPCTwin serial"
	DEVICENAME	  /dev/ttyS0
	LIBPATH 	  /usr/lib64/pcsc/drivers/serial/libccidtwin.so.0.4.1
	CHANNELID	  1

DEBUGGING

       In order to set up your /etc/reader.conf.d/reader.conf file correctly you may want to have debug messages from pcscd.  I recommend  you	to
       start pscsd in the foreground and debug mode using:
	# pcscd --foreground --debug

       If  everything  seems  OK  you can use the pcsc_scan command to print the list of correctly detected readers and try to get the ATR of your
       smart cards.

AUTHOR

       Ludovic Rousseau <ludovic.rousseau@free.fr>

SEE ALSO

       pcscd(8), pcsc_scan(1)

Muscle								    August 2005 						    READER.CONF(5)