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

9 More Discussions You Might Find Interesting

1. Linux

Need direction to make code for cellphone in C,C++ or Perl

Hi All, I need a help from the techie guys in this group.Actually, i need to make a code which can make wallpaper and ringtone for a mobile phone using any method. I know C,C++ and perl langauges but doesnot having much knowledge of JAVA. So can anybody tell me that whether i can... (0 Replies)
Discussion started by: basileis
0 Replies

2. Shell Programming and Scripting

Please make this code elegant.

Hi All, Following is the part of my script.It does contain many for loops and is not elegant. Please feel free to suggest any changes to make this elegant. Thanks! nua7 for i in `ls $CATALINA_HOME/shared/lib/*.jar`; do LOCALCLASSPATH="$LOCALCLASSPATH:$i" done for i in... (3 Replies)
Discussion started by: nua7
3 Replies

3. UNIX for Advanced & Expert Users

how to port a package to huge source code having its own make and compilers

In general for intalling a package like we do ./configure, make , make install But if we want to integrate the package with a huge source base what are the things to be taken care could some one have a light on purpose of ./configure , make and make install along with above question. I... (1 Reply)
Discussion started by: Gopi Krishna P
1 Replies

4. Solaris

Gani Network Driver Won't Install - make: Fatal error: Don't know how to make targ...

I attached a README file that I will refer to. I successfully completed everything in the README file until step 4. # pwd /gani/gani-2.4.4 # ls COPYING Makefile.macros gem.c Makefile Makefile.sparc_gcc gem.h Makefile.amd64_gcc ... (1 Reply)
Discussion started by: Bradj47
1 Replies

5. Shell Programming and Scripting

trying to make an AWK code for ordering numbers in a column from least to highest

Hi all, I have a large column of numbers like 5.6789 2.4578 9.4678 13.5673 1.6589 ..... I am trying to make an awk code so that awk can easily go through the column and arrange the numbers from least to highest like 1.6589 2.4578 5.6789 ....... can anybody suggest, how can I do... (5 Replies)
Discussion started by: ananyob
5 Replies

6. UNIX for Advanced & Expert Users

How to Make Sql Plus Exit with an Error Code

Dear all, How to make sqlplus command to exit with an apt error code in bash script, It always returns 0 for me. Thanks (9 Replies)
Discussion started by: vetrivendhan
9 Replies

7. Programming

Help with make this Fortran code more efficient (in HPC manner)

Hi there, I had run into some fortran code to modify. Obviously, it was written without thinking of high performance computing and not parallelized... Now I would like to make the code "on track" and parallel. After a whole afternoon thinking, I still cannot find where to start. Can any one... (3 Replies)
Discussion started by: P_E_M_Lee
3 Replies

8. Shell Programming and Scripting

Code to make sure Script runs only on sunday -

Hi I have written a script which restarts the application , I want to add a piece of code in my script , to make sure this gets executed only on sunday . So that even if someone runs it on any other day by mistake it should exit throwing an error message . Can someone please assist what will... (6 Replies)
Discussion started by: honey26
6 Replies

9. Shell Programming and Scripting

How to make this code working?

Hi Gurus, I wrote a simple code, but it doesn't work, can body help me to fix the issue. awk -F',' 'BEGIN{n=0}{ NR == FNR {fname;next} { if ($3==fname) n=1 } END{if n==0} }' tmpsrc srcfile.txt Thanks in advance (4 Replies)
Discussion started by: ken6503
4 Replies
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)
All times are GMT -4. The time now is 10:47 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy