Programming :: Writing A Mkdir -p C Program
Apr 9, 2011How to write a mkdir with -p option. I am struggling for creating subfolders. the chdir() is not working and thus subdirectories can't be created.
Code:
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General :: How To Give Options Like '-v' For Mkdir Using System Call Mkdir()
Feb 5, 2010I've written a program which creates a directory using the system call mkdir()
How can i execute 'mkdir -v' using this system call? is there another system call to include options?
Programming :: Firing Some Shell Command Like Ls - Mkdir Dir-name Via Kernel Module
Jun 10, 2010How can we fire a shell command like ls,./a.out automatically in kernel space via a kernel module ? i.e. replacement of system() function of user space into kernel space.We need to develop a kernel module which can fire some shell command let say "firefox [url]" automatically to open google automatically from module.
View 2 Replies View RelatedProgramming :: Comprehending Umask And Mkdir In C++ - Create A Directory With Permissions 755
Apr 27, 2011I'm having a bit of trouble understanding umask and mkdir in C++. In my program, I want to create a directory with the permissions 755.
If I do:-
Code:
The permissions come out all messed up.
But if I do:-
Code:
The permissions are set as expected.
I am having trouble understanding why umask(0); is needed, and what is the 'proper' way to use it so I can make my directory. From what I can understand from the man pages and everything, I need to set the umask in my program to allow it permission to make a directory with those permissions? And I don't get why umask(0); fixes it anyway!
General :: Detect If A Program Is Writing To A File?
Mar 3, 2009I have custom software that writes to a sensitive large file when the user does something. I would like to make backup copies of The file that gets written to, but if I make a gzip of the file at the same time someone is changing something, it will corrupt the backup because some of the data will be missing, as its backed up during being written to.
a) Is there a way to detect if a file is currently being accessed/written to?
That way if its currently being accessed, I can just make the script wait until its done and then finally back it up.
b) Instead of backing up the large file while it has potential to get written to, would it be better to make a copy of the file first, then gzip the copy? This idea comes from the fact that gzipping the original takes 5-10 seconds, whereas making a copy only takes 1-2 seconds. The less time, the less chance of corruption.
c) Is there anyway to freeze a program or a file to stop it from being written to for an amount of time?
With a, b, and c together. The best solution I have to my problem would be a script that first detects rather the file is being accessed. If not, it would then freeze the file/program and then make a quick copy of it. Once the copy is created, it will unfreeze the original file/program and then go about gzipping the copy.
General :: Writing C Program To Shutdown System?
Sep 12, 2010I usually download files from internet throughout the night. I can shut down computer automatically using commandshutdown -P timeThis works well ,but very often ,electric supplies cutoffs and system get rebooted and remain booted uselessly.In such case i want to use c program to shut down system after particular time which i will add on startup application list.If i added it on startup application every time i boot the computer it will automatically shutdown after particular time so ,to use the system i should be able to disable that program.
View 1 Replies View RelatedFedora :: Tablet / Wacom Note Writing Program?
Jun 12, 2010I'm looking for a decent program to take notes on my Lenovo tablet laptop. What's your favorite?
View 1 Replies View RelatedGeneral :: Writing And Compiling Java Program In Fedora 12?
Mar 21, 2010how we can we write java programs in java and how we execute it.. to produce output?
View 2 Replies View RelatedSoftware :: Install K3b Disk Writing Program In Ubuntu 11.04?
Jun 27, 2011K3b provides a comfortable user interface to perform most CD/DVD burning tasks. While the experienced user can take influence in all steps of the burning process the beginner may find comfort in the automatic settings and the reasonable K3b defaults which allow a quick start. If you want to install K3b goto ubuntu software center and type K3b in such box and press install button After installation is over open K3b when you open for first time you will see a box called "Did you know...? read that and press Next button. After reading all close that box and use K3b for CD/DVD burning tasks. You want to Add-ons for K3b select six add-ons and press Apply Changes button that all you can use it now. If you want to install K3b through Terminal window follow the this commands To install K3b
sudo apt-get update sudo apt-get install k3b Preview audio tracks withing the playlist editor is one of the features in K3b, you need to install and start arts sound server for this sudo apt-get install arts artsd & you may need to install mp3 plugin for built-in decoding software. sudo apt-get install libk3b2-mp3 Enjoy now.
Programming :: Line That Checks If Dir "TEST" Exists. If So, Nothing, Of Not Mkdir?
Aug 25, 2010I have a line of code from a csh script:Code:if ( ! -e TEST ) mkdir TESTit checks if the directory "TEST" exists and if it DOES exist then nothing happens, if it DOES NOT exist then directory TEST will be made. Now I want to use this in a sh (or bash) script. Does anybody know the equivalent of the line above for sh?
View 5 Replies View RelatedProgramming :: Writing A TCP Server ?
May 2, 2011I am going to write a TCP server program using c. Can anyone give me some advices on whats and what not to do specially when using select?
There would be a lot of data to be transferred both on the server and back to the client. I already have a simple server here but the server uses a lot of resources. Maybe 3 to 4 connections and the server's load would rise to unacceptable levels.
Which do you think is better to use fork or select?
Programming :: Writing A Page In PHP?
Apr 21, 2010I want to write some PHP for a website that'll have the data that the script will generate written inside a table with thin black line around it, much like LQ itself. My problem is: how do I draw the box that the text will be inside of, since the amount of text will vary - if I have a GIF with a picture of a box, that'll be of a fixed length, and my script can then only generate that much text, for it to look nice. Or do I need to fiddle with the GD library to get done what I want?
View 4 Replies View RelatedProgramming :: How To Implement Whole New Writing System
Aug 11, 2010So 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.
Programming :: Writing A Daemon That Can Update Itself?
Apr 27, 2011I have written a daemon server. I would like to add the ability for the daemon to update itself. That is, it should be able to download the latest version of the code (when it receives a signal from a client) and then restart itself. I am stuck on getting the daemon to restart itself. The problem is killing the old daemon without killing the process that is starting the new daemon. In my latest attempt, the daemon that is updating itself runs a program in a subshell (using system) that starts a restarter daemon that runs the original daemon (again using system) with the restart command option. With the restart option, the new version of the daemon sends a terminate signal to the old version. Obviously, when I run the original daemon manually with the restart option, it restarts reliably. I figured that issuing the same restart command from a daemon would adequately isolate the process doing the restarting from the program being restarted. Using ps, I can see that the daemon does actually restart. However, the client locks. In fact, a few times, the OS locked and I had to reset.
View 7 Replies View RelatedProgramming :: Writing File In Perl/cgi?
Apr 10, 2010I'm not able to write to a file using my perl cgi script which is as fallows:
Code:
#!/usr/bin/perl -w
use strict;
print "Content-type: text/html
[Code]....
Programming :: Writing Files Using O_DIRECT In C?
Feb 28, 2010I am trying to write .pgm images using the O_DIRECT flag in open().I have a char* buffer which has the image data. I know that I have to align the buffers and have done that using posix_memalign() yet only a part of the image gets written.Has someone used O_DIRECT for writing files successfully?
View 1 Replies View RelatedProgramming :: Writing Console Application?
Jul 7, 2010I'm trying to write a simple, console based application in linux, in c++. I know how to start in Eclipse and I have some experience in c++ from Windoze. I would like to ask, if there is some tutorial available on writing console apps. I mean, I know from using linux that there are two conventions on using parameters in command line (-v and --version for example).
View 2 Replies View RelatedProgramming :: Writing Routers In C Or Python
Mar 19, 2011My platform is linux Centos 5. I have read that to learn programming is to read well-written code and take some project to work with. I am always fascinated by routers and firewalls. Like pfsense and vyatta. May be my searching skills are worst but i am not able to find any good tutorials. Ofcourse i dont expect anyone to write a complete router on their blog but wasnt even close to it.
View 1 Replies View RelatedProgramming :: Java AT Command Writing Errors?
Nov 11, 2010I am running a java application on centos. For now I have a gsm modem connected via the the usb cable. Below is the message I get when I type the command dmesg | grep tty
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
00:0c: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
usb 2-2: pl2303 converter now attached to ttyUSB0
[code]....
Programming :: [C++] Writing Double Value To A Text File?
Jun 3, 2011Code:
int main ()
{
[code]...
Programming :: An Assignment: Writing A Bash Script
Oct 2, 2010I have assignment to write bash script and I have to submit it after tommorow . I do not have experience to finish it by myself.I am really need help if any one can contact me. on my email I will be thanks him/ her.
View 14 Replies View RelatedProgramming :: Reading And Writing Text Files In C?
Jan 1, 2011Reading and writing text files in C?
View 9 Replies View RelatedProgramming :: Reading/writing Every Frame On Ethernet?
Dec 3, 2010I would like to write a program that can read every ethernet frame arriving on a specific hardware NIC, without a TCP/IP stack otherwise doing anything on that NIC. Likewise I want to be able to write out to that NIC. So every arriving ethernet frame, of all types, would be readable (probably one at a time to preserve frame boundaries). And every write of exactly that same data would send frames out. The data read and written would be the whole ethernet frame. The kernel would do nothing else with this data, but other NICs would still operate as usual.
What I would be doing is that on 2 separate NICs, copying frames from one to the other, as in bridging. But I would also be doing modifications per what my program needs to do (not at liberty to say what that would be). What facility would I need to be looking at to do this? There is no ethernet device file. Would raw sockets be able to do this? The programming language will be C.
Programming :: Writing A Service In C++ And Starting At Boot?
Nov 10, 2010I created a small C++ program which starts a server in a separate thread and waits the user to press q using the standard input/output. Something like:
Code:
printf(...);
server->Start();
[code]....
Programming :: Writing A Trivial Kernel Module ?
May 28, 2010I am trying to learn how to write a kernel module. I am following the excellent guide from The Linux Documentation Project called The Linux Kernel Module Programming Guide v.2.6.4.
My machine is running Ubuntu Lucid Lynx (10.04)
Code:
I installed the corresponding linux headers and just to make sure I also installed the linux source and extracted it in /usr/src
I am trying to run the following trivial kernel module
Code:
Programming :: Writing And Reading Driver Value In Ioctl?
Jan 18, 2011I just want to read and write some values (integer) to my driver. I used put/get user but always getting errors.
driver
Quote:
int Wert;
static int device_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsinged long arg)
int ret;
[code]...
Quote:
int WERT
ret=ioctl(fd, SETIT, WERT)
ret=ioctl(fd, GETIT, WERT)
if i say in C++ WERT is 5 the value arg of the driver becomes 5 but not WERT the returnvalue of get and put user is -1 so it failed.
Programming :: Writing To Console From Kernel Module
Mar 2, 2011I'm currently doing a tutorial for writing kernel modules. Right now I'm still at the very beginning, i.e. writing my helloworld stuff.
But what I like to do now is to write stuff onto the console, and I don't get it. According to my tutorials I can print stuff on the console using the printk()-function as long as the priority-level of the macro used in printk() is lower than the console_loglevel (how can I find that value out btw?).
But it doesn't work for me. Even if I use KERN_EMERG it still gets only logged, but not printed on the console and I thought KERN_EMERG get always printed...
Here's my code:
Code:
Code:
Everything works fine. But as soon as there are any blanks in mystring, e.g.
Code:
I always get
Code:
Why do I get this error and how can I insert string with blanks?
Programming :: Writing To Serial Port From Kernel?
Aug 16, 2010I want to write data to serial port ( ttyS ) from inside the kernel.
View 5 Replies View RelatedProgramming :: Writing A Shell Script That Logs Some Actions?
Mar 26, 2010I need help creating a script that makes a log file in wich to save information about every user that uses the ftp command (information like username and date) and the server to wich he is trying to connect.
View 2 Replies View RelatedProgramming :: Reading And Writing White Spaces To A File?
Dec 2, 2010I am trying to read a file character wise and trying to write the same character to another file. In this process, I unable to read and write white spaces successfully to the new file. The script reads the white spaces but while writing the white space is lost. The section of the code, is given below. Please advice how can i read and retain the white space while writing to a new file.
Code:
if [ -s f_test.txt ] && [ -f f_test.txt ]; then
echo "File Exists !!"
while read -n1 char; do
[code]....