Programming :: Implement A System Call For Displaying The System Statistics

Nov 6, 2010

I have been assigned to implement a system call that report the system statistics over all memory which are

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Programming :: How To Implement Whole New Writing System

Aug 11, 2010

So basically, there is a really cool writing system I have been working on. It could be viewed (for simplification purposes) like an encryption method for the Latin script.

Facts about the writing system:
It has a little over 300 symbols.
It is syllable-driven.
It is highly compositional (eg. "c", "ca", "cae", "ca " and "ci." all map to different symbols - and NOT by overlaying elements)
Symbols have medium graphical complexity (comparable to Korean Hangul, or Japanese Hiragana)
Has a rather complex set of diacritics (~10, some of which can go on any symbol)
Has no ligatures

How transliteration occurs:
Sequences of Latin symbols map to certain symbols. Example below:[G][rou][p ][hu][g.]Characters sequences between "[" and "]" map to a single symbol (so it would take only 5 symbols to write "Group hug.").

How I want it to work:
I would like to have a daemon that: Intercepts all text displayed on the screen.
Converts it to my writing system (changes letter sequences with individual Unicode codes)
Leaves unsupported symbols unchanged.
Displays all the text on the screen using my font and characters intertwined with the fonts and characters left unchanged.

For example, if you take the following line of C++ code:for (i = 1; i <= n; i++)
I would like it displayed like this:[fo][r ]([i ]= [1]; [i ]<= [n]; [i]++)
Bold-symbols should be in my Unicode font with special symbols defined for this writing system, and the rest should be in its original font and encoding. Also, I would like this encoding to hold for display-purposes only. The data in the memory should remain unaffected. This also means real-time adjustments: if I open a text editor (say, from the OpenOffice Suite) and I start typing, I would like to see what I type encoded with my writing system, even though the document actually contains Latin letters. This also means that the symbol immediately before the cursor may change as you type.

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Programming :: Learn Basic C++ - Implement Something Using System() Or Popen() Without Success

Jul 21, 2010

I've got a (very) simple perl xinetd server that I'd like to port to C++. implement something similar using system() or popen() without success.

[code]...

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Programming :: Execvp System Call?

Apr 3, 2011

in below program why was new_args[0], rather than the reference the_cmd, passed to the execvp system call?

Code:
/*
A _very_ limited shell program

[code]....

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Programming :: Clarification In The Select System Call?

Dec 8, 2010

I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..

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Programming :: C - System Call & Error Checking?

Sep 18, 2010

I am trying to figure out how i would go about finding out where system call is made and error checking is not done. I have code below, if somebody can point me in the right direction where system call is made but error checking is not done.Quote:

#include "shell.h"
#include <stdio.h>
#include <string.h>

[code]....

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Programming :: How To View New Added System Call

Aug 30, 2010

I successfully added a new system call in CentOS Kernel but I don't know where to view it! My kernel version is -2.6.32.5

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Programming :: Process Of Creating System Call?

Mar 24, 2011

how to create a new system call Linux? what is the process of creating ?my project is to create a system call for displaying owner of a file..where exactly we have to write the system call code? and where are the places need to change ?

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Programming :: Test New System Call Before Compiling Kernel?

Apr 2, 2009

I want to test my system call that be goint to add to kernel, But when i finish compiling kernel, i found my system call code not work. the code i want to return the system time "struct timespec":

/*----------Start of mycall.c----------*/
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/kernel.h>

[code]....

so i want a method to test the new system call before compiling kernel.

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Programming :: Sleep Call Causes Whole GNU System To Hang Indefinitely

May 6, 2011

Anyone know the reason why a sleep( ) on a Redhat Linux OS would cause the system to indefinitely hang? It's doing this every 10 or so calls in my program and I have to press the reboot button on my computer. My program is reading from a UDP port that has messages sent to it 20 times per second. When I sleep I assume the internal UDP buffer is getting more and more filled.

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Programming :: Make System Call From An Automatically Started Daemon?

Apr 2, 2011

i've written small tool in C which makes measurements on my router (OpenWrt White Russian).

It is working as a deamon. If the tool is started manually, everything works fine. If it is started per script on startup, the following system call doesn't work :

Code: sprintf(command,"/bin/cat /root/%s%s | /usr/bin/ssh -p2222 user(at)host -i /root/.ssh/id_rsa "/bin/cat >> result/%s%s"", apmac, source, apmac, dest);

rc = system (command); the returned rc in this case is 256.

first i thought it is a problems with the user rights for the tool, so i have added +s to it. but that didn't help. as i said, when the daemon is started by hand, the system call works fine.

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Programming :: Unpredictable Behaviour With Send/recv System Call?

Jul 30, 2011

I am making a library, but I am facing a strange problem while sending data over network using ethernet.

I am sending 39 bytes of the data from one server to slave application but some time slave receives 39 bytes and some time it receives 29 bytes. And when ever slave receives 29 bytes all the memories to which my pointers are pointing get changed. This problem is only when I am sending data from the server to slave, while sending data from slave to server I am facing no such issue.

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Programming :: Using Scripts In System Call In Applicationand Want Script's Output

Sep 8, 2010

I have a script for dd command and i am using it in an application using system() call. Now i want to have the output of the script file (i.e output of dd command) in the application file itself.

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Programming :: Poll() System Call Not Returning When The Socket Is Closed Locally?

Sep 29, 2010

we have a multi threaded program on Linux where one thread is waiting on poll() system call with event set to POLLIN, & another thread has closed the same socket fd (which is passed to poll) , but the poll() did not return, is this the expected behavior? From man page of poll we found that the poll should return POLLNVAL if the socket fd is closed, is my understanding correct or is there any bug in the poll()?In Solaris we observed that the poll system call is returning with POLLNVAL if the socket is closed.

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Programming :: Simple Example Document For Adding A System Call On Fedora 14 Kernel?

Nov 20, 2010

Does anyone have straightforward simple example document for adding a system call on fedora 14 kernel?

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Programming :: Working With System Call - Read Output And Parse Values

Dec 10, 2010

I have the following code:
Code:
#include <stdio.h>
#include <stdlib.h>
int main() {
system("ps -ef | grep myprocessname");
return 0; }

When I run this program it outputs the following list of running processes:
Code:
root 10279 10275 0 13:02 ? 00:00:00 myprocessname myvar1=value1 myvar2=value2
root 10341 10337 1 13:02 ? 00:00:00 myprocessname myvar1=value1 myvar2=value2

What I want to really do is instead of writing the output to screen I want to read the output and parse the various values value1, value2 etc. What is the best way to do this?

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Software :: Script That Call A Java Program That Call A System Command?

Nov 29, 2010

In practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab

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Red Hat / Fedora :: Statistics On Number Of People Who Use RHL In Comparison To Other System Distros?

Aug 2, 2010

I am looking for statistics on the number of people who use RHL in comparison to other linux distros. Any help on finding up to date numbers?

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Programming :: Error 4 Which (according To /usr/include/asm-generic/errno-base.h) Means "interrupted System Call"

Aug 1, 2010

I'm using gmake (v3.81) to build some c executables. As the first step in the process I run the files through a preprocessor (for embedded SQL). The preprocessor completes successfully, but the gmake reports an error and discontinues buiding the remaining dependencies...

make *** [myfile.c] Error 4

which (according to /usr/include/asm-generic/errno-base.h) means "interrupted System Call". My preprocessor doesn't raise any signals, so I'm not sure what's causing this error.

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General :: Implement Pfexec In System / Use Sudo In It?

Dec 21, 2010

How can implement pfexec in Linux? Can i use sudo in Linux?

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Server :: Implement Disk Quotas For Root File System?

Jan 2, 2011

There isn't any separate file system for /home and we have only one (/) root file system for everything else on the system. Is there any way that we can still implement quotas for users through their home directories was mounted on (/) root file system. Do we need to have a separate file system (/home) compulsory for implementing disk quotas?

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Server :: Implement Operating System Level Visualization To Isolate A Application On RHEL 5.5

Oct 20, 2010

I need to implement operating system level visualization to isolate a application on RHEL 5.5. Which one tool in following for implementation Linux-VServer, lxc, OpenVZ or anyone else.

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Red Hat / Fedora :: Unable To Add System Call

Dec 3, 2010

iam trying to add a system call to the kernel version 2.6.33.7.Iam running fedora 13.I have followed all the steps given in this <hekimian-williams.com/?p=20 -> tutorial,but iam getting a error in make saying undfined reference to mysyscall in syscall_table_32.

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General :: What Is Signal0 In System Call

Sep 28, 2010

what is what is signal 0 in linux system call ?i can't find that in kill -l signal list . i need to know what is signal 0 . * for examples signal 1 is SIGHUP and signal 2 is SIGINIT . what is signal 0 ?

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Ubuntu :: Adding A Call System To Kernel?

Apr 21, 2010

My ubuntu version is 9.10

I was working on adding a call system to my linux kernel.

I tried a lot of threads and .pdf files which explaining how to add a system call. Like :

1- This thread
2- .pdf file

and many ..

I tried working with linux-2.6.18.1 , 2.6.33.1 , 2.6.28.1 and many many.

But , all of them are returning -1 as result ..

I prefer working on 2.6.28 kernel version or above like 2.6.33.1

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General :: The READ System Call In UNIX?

Oct 29, 2010

mplement the read system call in unix...i want the code for read system call...

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General :: Error While Adding The New System Call?

Jun 9, 2011

I have added a new system call for kernel version Linux 2.6.25-14.fc9.i686. after kernel compilation and running the user mode program i am getting the below error

Error :: Function not implemented
Error number 29

I cannot find the syscall_table.S or entry.S file in the source code , so i didn't made the entry of the syscall in this file, how much necessary the entry of syscall presence in this list and how to get this file?

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General :: System Call To Know Files And Directories In PWD

Mar 3, 2010

I am searching for any system call similar to "ls" command we use in shell. My requirement is knowing the files and directories in curent working directory and process them based on there type. Here as of now I spawn another procees with system command like system
("sh ls -l | grep ^d | awk '{print $9}'").

Instead of this I want to use any system command where I can capture this information directly into my local character buffer. My opinion is that system calls will not spawn another process as a result less time it takes, another reason is once I use the system command again I need to capture the information to a local file then again read it into local buffer. I want to avoid the file manipulation here.

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Software :: Want To Change Directory System Call

Apr 14, 2011

I am trying to ptrace a process and when the system call is 'cd' change directory,
the ptrace process is able to trap it by comparing it against "__NR__open" system call. When I try to read the name of the directory from ebx register using peek_data I am getting ".message" and not the directory name.
The same thing works fine when I am tracing a file open system call.

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Ubuntu :: Not Displaying Folders And Files In Desktop After Starting The System ?

Aug 11, 2010

I dont know whats wrong with my desktop....but it is not displaying folders and files in desktop after starting the system.The mouse right click is also not working.But the panels are working.

But once I browse files on my cell phone(using bluetooth) with my system,the desktop is working as usual.

I think I have to add some application( which loads desktop) to list of start-up applications.

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