CentOS 7.0 - man page for pcsc-spy (centos section 1)
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PCSC-SPY(1) PC/SC lite PCSC-SPY(1)
pcsc-spy - A PC/SC spy command
pcsc-spy [-n|--nocolor] [-d|--diffable] [-h|--help] [fifo_filename]
pcsc-spy displays PC/SC calls of an application. It must be used with the libpcscspy.so
To be able to spy the PC/SC layer, the application flow must be modified so that all PC/SC
calls are redirected. Two options are available:
- the application is linked with libpcsclite.so.1
- the application loads the libpcsclite.so.1 library using dlopen(3)
Demove the variable parts (like handler values) from the output so that two execution
can be more easily compared.
Display a short help text.
Disable the output colorization (if you want redirect the output in a file for
Print the version of the pcsc-spy program plus a copyright, a list of authors.
Applications linked with libpcsclite.so.1
We will use the standard LD_PRELOAD loader option to load our spying library.
Application loading libpcsclite.so.1
This is the case for the PC/SC wrappers like pyscard (for Python) and pcsc-perl (for
Perl). The LD_PRELOAD mechanism can't be used. Instead we replace the libpcsclite.so.1
library by the spying one.
You may use install_spy.sh and uninstall_spy.sh to install and uninstall the spying
Using the spying library without pcsc-spy is not a problem but has side effects:
- a line "libpcsclite_nospy.so.1: cannot open shared object file: No such file or
directory" will be displayed
- some CPU time will be lost because of the PC/SC calls redirection
Starting the spy tool
If a command argument is passed we use it instead of the default ~/pcsc-spy FIFO file. It
is then possible to record an execution log and use pcsc-spy multiple times on the same
To create the log file just do:
cat ~/pcsc-spy > logfile
and run your PC/SC application.
Mac OS X
The installation is not automatic. In the pcsc-lite/src/spy directory do:
Then copy the PCSC.framework directory in /tmp
cp -a PCSC.framework /tmp
Copy the official PCSC.framework (binary only) in /tmp
cp /System/Library/Frameworks/PCSC.framework/PCSC /tmp
Run the application to debug as:
~/pcsc-spy FIFO file is used by libpcsclite.so.1 to send the raw log lines
This manual page was written by Ludovic Rousseau <firstname.lastname@example.org>
pcsc-lite 1.8.8 2012-08-25 PCSC-SPY(1)
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