Programming :: C Library Or Some Functions To Read Proc Filesystem

Dec 6, 2010

I have a requirement, to read the complete proc filesystem from the linux pc.. Does linux provide some functions to read the proc filesystem means the directories and files present in the filesystem.. in short I want to create a treeview of proc filesystem. and if a user selects the file in the proc.. I should show the contents in the respective file. So I want some library or functions to read the proc filesystem..

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Programming :: Definitions For C Library Functions ?

Apr 24, 2010

Where are the definitions for C library functions located? It was just recently that I realized that header files don't actually define any functions, they merely include their prototypes.

For instance, stdio.h includes the following line:


This just means that the definition of printf() is located in another file. What file? Is there some kind of default shared object file that is automatically included during compilation?

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Programming :: Documentation For SoundTouch Library And Its Functions

Sep 29, 2009

Do you know where can I find documentation to SoundTouch library a its functions?

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Programming :: Way To Make Proc Filesystem Writable?

Jul 22, 2010

is there a way to make the /proc filesystem writeable? With aufs or unionfs i can't join the /proc filesystem with a writable directory directly. But i think it should work by using one of this file systems.If i try to join two dirs write-proc and virtual-proc Code: mount -v -t aufs -o dirs=/tmp/write-proc/:/tmp/virtual-proc/ none /tmp/joined-proc/ and afterwards make a bind mount /proc to virtual-proc Code: mount --bind /proc /tmp/virtual-proc/ i can't see any change in /tmp/joined-proc.

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Programming :: Read Time Of /proc/net/tcp6 File

Dec 8, 2010

I am trying to read the /proc/net/tcp6 file of a huge server (chat server) for monitoring the tcp6 connection states.

My server's tcp6 file has more than 26000 lines. For monitoring the server connections, my monitoring tool has to read the /proc/net/tcp6 file quickly in a regular interval (5 secs) and process. Presently it takes minimum 6-7 seconds for reading the whole file.

My tool can able to read the normal file (26,000 lines) less than 1 second, but it is not possible to read the same size of proc file.

I have 2 questions:

1) Why proc file takes more read time than normal file?

2) Is there any way to read the /proc/net/tcp6 file more quickly?

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Programming :: Bash - Ps - Psgrep And Read /proc/$pid Make Script Exit

Mar 22, 2011

I have not been able to write bash to use a PID file to ensure no other instance of the same script is running! All three methods I can think of to see if the PID in the PID file is another instance of the script make the script exit with a return code of 1 but the same commands run at the command prompt work as expected.

The first attempt was:


The first attempted workaround was:


The second attempted workaround (with debug to make the following command prompt copy and paste meaningful) was:


Here's the command prompt session, testing with a stale PID file and then manually running the problem command and it behaving as expected:


This on Slackware64 13.1 which has bash 4.1.7.

In desperation I tried rebooting but the behaviour was the same.

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Programming :: Parse /proc Filesystem "files" For Results?

Dec 1, 2010

Im reading in file /proc/cpuinfo into a char array.Im using strstr to search for a string im interested in (the cpu speed line) and storing it in another char array.I want to just store the line that contains CPU speed but im getting everything after the CPU speed line in the char array too.Is there anything better than strstr or is there someway i can parse the the payload data (i.e. the actual cpu speed)

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Ubuntu :: Inbuilt Library Functions Of C++?

Mar 16, 2010

I use g edit to write my C++ codes. How can I know the inbuilt library functions of C++?

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Ubuntu :: How To Know In Built Library Functions

Mar 21, 2010

while writing my codes in g-edit, how do I know the in built library functions? Like in turbo C we can see the library functions? Is there any such features?How can I do that?

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Software :: Library Functions Available For Encryption Like Windows ?

Feb 11, 2009

Is there any library functions are available for encryption and decryption like windows. in windows we have wincrypt.h is there like that any thing is there in unix.

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Programming :: Define Functions Within Other Functions In C++?

Mar 11, 2010

Is it possible to define functions within other functions in C++? I know it is the case in other languages.

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Ubuntu Servers :: Proc Folder Is Filling Up Filesystem?

Mar 1, 2010

My filesystem is almost full and the problem is in the proc folder.What does that folder contain and can I delete something from it?

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General :: External Drive Read Only - WARNING! Running E2fsck On A Mounted Filesystem May Cause SEVERE Filesystem Damage

Mar 24, 2010

I've had a look at some similar threads but as I'm very new to linux they're already a bit technical for me. Sorry, this calls for someone with patience. I gather from other threads that disconnecting an external drive without unmounting is a no-no, and this seems to be the likely cause. Now the disk is read only and I'm unable to change any settings through the usual control panel on ubuntu. I'm just not familiar with the terminal instructions. I tried to cut and past a few command lines from other threads but I got some warnings that proceding could damage data. Like this one: WARNING! Running e2fsck on a mounted filesystem may cause SEVERE filesystem damage.

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Programming :: SDL Static Library - Shared Library ?

Apr 7, 2009

I'm reading about shared, static, and dynamic libraries. What is SDL? Is it static, shared, or dynamic?

I always thought a library would be a lot of .h and .cpp files compiled separately into .o files and then if you compiled your own program you could use the -l parameter to link the library and it was all compiled together. Now I'm not so sure.

I don't even see any SDL .cpp files in my system anywhere. All I have are lots of SDL .h files in /usr/include/SDL and I don't really understand the code in them.

I'm making a wild guess here: SDL is a shared library. SDL itself is NOT compiled into my program, therefore SDL must be on any system my program tries to run on. When I compile and link SDL all it needs is the header files to know what SDL function and objects it can use. And then on every system it uses an already compiled SDL shared library thingy somewhere.

So... where is that part of SDL? All I can find are header files.

I'm thinking the advantage of shared libraries is that someone could say update SDL on their own system and take advantage of the new features without having to download new executables with the new version of SDL compiled into them for every program that uses SDL.

So if I'm making an editor and a game engine and they both use a lot of the same .cpp and .h files that I wrote and I'm tired of updating one and then the other and I need to turn them into a library, then a shared library might be kind of a silly solution. I could just make a static library. Right? Because it's not SDL. Nobody else is ever going to use this library.

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Programming :: C++ Programming With Simple RTAI Functions Outputing Words?

Apr 11, 2011

I need help as I am not proficient with Linux C++ Programming. There are two parts which I need to do in the coding provided below.

1. Produce the program so it can output the word "Hey there!" and wait two minute and print the word "See you later!".

2. Produce the program that will output the text "Cool" every 20 seconds by setting a periodic task.

#include <linux/kernel.h>
#include <linux/module.h>
int init_module(void)
printk("Hey there!


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Fedora Installation :: An Error Occurred Mounting Device Proc As /proc: Mount Failed

Jul 6, 2010

I've got the F13 LiveCD that I was able to boot and use using the "nomodeset" boot option. From the desktop I'm trying to perform an Install to Hard Drive. I've read the Install from LiveCD post regarding the creation of a /boot partition and a / root partition. I've tried creating them without the LVM group and with. But every time I appempt to install I get...

An error occurred mounting device proc as /proc: mount failed: (9, None). This is a fatal error and the install cannot continue.

Hardware is a Sager 8887 (P4, 3.06HT, 60GB HDD, Radeon 9000 graphics adapter)

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Programming :: Convert A Dynamic Library ( To A Static Library (filename.a)?

Nov 18, 2009

How can we convert a dynamic library ( to a static library (filename.a) using gnu gcc . Can we get a static library form a dynamic library . I saw a few post in which the conversion form a static library to a dynamic library is mentioned but, unfortunately, not the other way.

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General :: Deleted The /etc/rc.d/functions Folder And Functions.d Script And Turned Arch Machine Into A Brick?

Mar 19, 2011

None of my daemon scripts work now, and the startup process displayed errors. Should I reinstall the OS and start from scratch, or is there a way to recover these files? Is there a way to rebuild the files I deleted?

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Programming :: Where Are Described Functions That Can Be Used With Stap

Mar 26, 2011

could you please explain few questions about systemtap.

seems gettimeofday_s() always returns 0 Code: stap -ve 'probe timer.s(4){ printf("%d ",


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OpenSUSE :: Filesystem Has Become Read-only?

Aug 1, 2010

openSuse v9.3 (Yes, it's old)linux i686At some time after July 28 the entire filesystem has become read-only. It was functional on July 28, the last time I logged into the machine and edited a file. Even as the superuser when I attempt to change, say, the permissions of a file, I get:

> # chmod 777 /opt
chmod: changing permissions of `/opt': Read-only file system


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CentOS 5 :: Filesystem Became Read-only?

Jul 17, 2009

I have 64bit install with CentOS release 5.3 (Final)It's been stable for about six months. What happened a while ago is really weird, I haven't messed with anything lately but the entire /home filesystem became read-only. Can't write, can't delete to anything on /home. The other filesystems are fine. I am root, and the permissions look normal. My directories and files are writable and readable.

root@atlanta [/home]# touch foo.txt
touch: cannot touch `foo.txt': Read-only file system
root@atlanta [/home]# ls -l


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Programming :: Write The Value To The Proc Entry In The Program?

May 1, 2011

I have a kernel module program which is used to create a entry in the proc file system. I have to read and write values in the entry. Its taken from a online tutorial to write the value to the proc entry in the program ?

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Programming :: Unable To Use An Alias In The Ksh Functions

Apr 4, 2011

I have problem to use an alias that defined in ksh93 script,in the functions in the same script onm Linux.I definied an alias in main: alias echo='echo -e' in order that echo will read backslashes but when i executed it in function, the alias didnt work, and performewd a regular echo, without -e

cat test.ksh
alias echo='echo -e'


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Programming :: Check The Db For Some Value And Run Some Functions To Do Some Checks?

May 15, 2011

have an application where from time to time I need to check the db for some value and run some functions to do some checks. is the best option do it as php daemon or cron job?Whatworried of cron job is the overalapping.

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Programming :: Defining Functions - What Is The Difference?

Aug 12, 2010

But what is the difference between this...

my_fucnction () {
echo "Hello World"
function my_fucnction {


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Programming :: Multithreading For Callback Functions

Jan 4, 2011

Im implementing a chat application using Jabber/XMPP and gloox framework which should send and receive messages concurrently in Ubuntu Linux.

The problem faced is both the threads are created and pthread_join( ) is called for both.The iSend thread is scheduled first but gets suspended at cin. Once the recv( ) function is called, which runs in iRecv thread, the recv call back function handleMessage( ) is called. However the control never shifts back to the iSend thread which should call SendMessage( ) function.

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Programming :: Nesting Switch Functions In C?

Apr 12, 2010

I am trying to write a simple program in C that involves nesting switches. For example switch 1 offers an option to go to module 1 or 2 or quit. when I go to module 1 there is another switch function offering two or more choices.

I can select either module 1 or 2 at the start of the program and the selection text for, say, module 1 prints to screen but then exits without allowing a second selection to be entered.

I tried using free([first selection]) thinking that might do the trick but it doesn't.

Is it possible to next switches on after another in C?

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Programming :: Macos Does Not Have Barrier Functions?

May 9, 2010

The pthreads library on macos does not have barrier functions (pthread_barrier_t ....). Is there a way to get around this? I know I can do :

#ifdef __APPLE__
pthread_barrier_t ...
my_barrier ...

But I would like to avoid this approach as there are a lot of places in my program where I would have to make this change. Can I perhaps rebuild the pthreads library on macos without affecting other apps ?

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Ubuntu :: 11.04 - Read Only Filesystem (And Lost)

Jun 14, 2011

This is very bad even in 11.04! I have an usb disk 40 Gb. And I was loading it with data real fast (svn). At once I could no more write, Read-only file system was reported. I reckon that problem from years ago on redhat, so I try to fix it. But It became worse. It was severe damaged. I created a new filesystem while the disk was out the usb-box and directly connected to de IDE. Started all over, and the error also. Tried to repair with no luck. It looks like the journal get overrun but I'm not sure. However I do think its reproducible. I did it 3 times now and now I am very sick of it. This is happening on a updated 10:10 to 11:04 system, a few weeks ago.

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Ubuntu :: Read Out Superblock Of A Filesystem?

Mar 31, 2010

How can i read out the superblock of a filesystem?

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