10-08-2001
Did you write the code?
Was it written for and compiled on UNIX/Linux?
Does the code interact with any devices or shared resources?
In general (based on your question alone), you can run a
"black box" type of process any number of times from any
number of termials. Much depends on what it is the code
needs to do.
The basics for writing reentrant functions is
a reentrant function does not hold static data over successive
calls, nor does it return a pointer to static data. All data is
provided by the caller of the function. A reentrant function must
not call non-reentrant functions.
In most cases, non-reentrant functions must be replaced by
functions with a modified interface to be reentrant. Non-reentrant
functions cannot be used by multiple threads. Furthermore, it may
be impossible to make a non-reentrant function thread-safe.
You may want to pick up a book or two on advanced unix
programming and programming threads for a more in-depth
discussion on reentrant and thread-safe code.
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LEARN ABOUT SUSE
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 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 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The "CHANNELID" is no more used for recent drivers (IFD handler 3.0) and has been superseded by "DEVICENAME".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/readers/serial/libccidtwin.so.0.4.1
CHANNELID 1
DEBUGGING
In order to set up your /etc/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)