How to make a C code reentrant? Post: 8211

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Top Forums Programming How to make a C code reentrant? Post 8211 by rwb1959 on Monday 8th of October 2001 11:17:16 AM

10-08-2001

Registered User

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.

rwb1959

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LEARN ABOUT DEBIAN

towitoko-tester

Towitoko Tester(1)					      General Commands Manual						Towitoko Tester(1)

NAME

       towitoko-tester	--	Towitoko driver CT-API interface tester tool

SYNOPSIS

       towitoko-tester

DESCRIPTION

       towitoko-tester	is  a  simple tool that allows executing some simple commands on a smartcard using a Towitoko smartcard reader.  It can be
       used to test that a smartcard can be properly recognized, and that it can be read and written.

       The tool provides a text based menu interface. Commands that can be executed via the menu depends on the reader card insertion  status  and
       the  type  of card inserted. For memory cards it permits reading and writing data bytes, checking and changing the PIN. For processor cards
       it permits selecting, reading and updating binary card files.

       Several readers on different ports can be used at a time. The text menu allows opening, closing and changing current  port.  The  smartcard
       can  be	inserted  and  removed	from any initialized reader at any time.  The tool will automatically detect when the card is inserted and
       removed, and will update the information shown in the menu. However you must refresh the menu to see any change reflected.

       If you have installed pcscd package, and have configured your reader to be used by pscsd, you'll need to stop the pcsc daemon  before  ini-
       tializing the reader with towitoko-tester.

SEE ALSO

       ctapi (3) and ctbcs (3). pcscd (8)

AUTHOR

       This manual page was written by Carlos Prados <cprados@debian.org>.

																Towitoko Tester(1)