Programming :: Use Setsid In Order To Create A Daemon?
Apr 21, 2010I would like to know if is it necessary(and why) to use setsid to create a session leader in order to create a daemon process?
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Programming :: Convert The XML Output Files To SQL In Order To Create Or Update An SQL Database?
Dec 7, 2010I've a program which manages my pdf and references. I wish to put some of the information on my website but that program (Mendeley) does export only in XML (or bibtex). I'd like to simply convert the XML output files to SQL in order to create or update an SQL database.I'm not an expert in either XML or SQL (use only PHPMyadmin). Does someone get help me to figure out?
View 2 Replies View RelatedUbuntu :: Manually Restart The Avahi-daemon In Order For The Music Players Unable To 'see' The Music Server?
May 2, 2010I use mt-daapd music server to stream music to a couple of network music players (which use UPnP protocols). Recently (last month or so) I have found that on restarting my ubuntu system I need to manually restart the avahi-daemon in order for the music players to be able to 'see' the music server. I think avahi-damon is running when ubuntu first starts up. The output of a ps aux shows:
[Code]...
I'd like to understand why I need to restart the avahi-daemon and either solve this or learn a way to automate restarting it on system boot up so I don't have to do it manually each time. My system is ubuntu 9.10 64 bit and the version of avahi-daemon is 0.6.25
Ubuntu :: How To Create A Startup Daemon
May 25, 2010I installed ActiveMQ, set up an init.d script and was able to start | stop | restart ActiveMQ from the init.d script. However, when I tried to use:
>sudo chkconfig --add activemq
upstart seemed not to like it. Having NO documentation on how to create a daemon that works with Upstart on the Ubuntu forums, I'm wondering if anyone has any idea why my init.d script doesn't convert.I'm using Ubuntu 10.x.x but this happens on 9.x.x also.
Here is my script..
Code:
#!/bin/bash
#
### BEGIN INIT INFO
# Provides: activemq
[code]....
General :: Create A User List In Alphabetical Order?
Oct 22, 2010I have a server with what appears to have 352 home directories (350 actually if you omit '.' & '..') & I am being asked to basically tally a list of whom all 350 users are in alphabetical order. Now I could sit here for days doing the 'finger' command to obtain their full name commented in '/etc/passwd' file but I would assume there is a script or way I could have Linux quirry the '/etc/passwd' file & take all the user 'comment' entries and export them to a list in alphabetical order. Does anyone know if this could happen and if so, how would I do something like this? I can't write bash / shell scripts to save my life
Code:
cmennens@mail]:/$ ls -l
total 160
drwxr-xr-x 352 root root 12288 Oct 21 13:41 home
Programming :: Use Socket Programming In Order To Implement Chatting Feature?
Aug 25, 2010how to use socket programming in order to implement chatting feature
View 5 Replies View RelatedProgramming :: 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 :: No Output To Log File From Daemon Program?
Mar 18, 2011I am learning Linux daemon programming and write a simple daemon program. The issue is no data is written to the log file (/var/tmp/simpledeamon.log) though the file is successfully created (it's file size is zero from ls -l output). Could someone kindly point out the error in my program,The code is based on the Devin Watson's article at Here is the code:
// simplydaemon.cpp
// A simple Linux daemon.
#include <sys/types.h>
[code]...
Programming :: Passing Commands To Running Daemon?
May 10, 2010I am working on a daemon that I want to change some variables while its running. Is this possible?I want to implement a command line type interface for my daemon so I can send it commands that will change the current values of specific variables, and also be able tell the daemon to load/save a config file.The only thing I have found so far is passing arguments to a daemon, but that seems to be a one-time shot when your first starting it.
View 6 Replies View RelatedProgramming :: Haskell - I/O Not In Order?
Apr 18, 2011I'm learning Haskell from an on-line tutorial, and trying to figure out how I/O works. I'm a bit confused with this example:
Code:
My expectation is for it to ask me for a line, then for it to convert the line I provide to uppercase (err... create a new line that is uppercase) and then output said line.
However, what actually happens when I run it is it firsts ask me for a line, then outputs "Next line: ", then outputs the uppercase line:
Code:
I realize that Haskell is not an imperative language, but I was (mistakenly?) under the impression that there was some kind of sequence guaranteed in the do blocks. Could someone explain why this happens, and how I can "fix" my code to get the desired behavior?
I'm running:
- Linux version 2.6.34-gentoo-r12 (64-bit)
- GNU bash, version 4.1.9(2)-release (x86_64-pc-linux-gnu)
- Glasgow Haskell Compiler, Version 6.12.3, for Haskell 98, stage 2 booted by GHC version 6.12.3
Programming :: Replace A Value In Order?
Jul 26, 2011I want to change the parameter for ThreadLimit for one file as shown below using sed. I want to ignore the commented line. But the command I am using also executing with commented line.
# ThreadLimit: maximum setting of ThreadsPerChild
ThreadLimit 25
I want the desired output as
# ThreadLimit: maximum setting of ThreadsPerChild
#ThreadLimit 25
ThreadLimit 50
For this I am using command.
sed '/ThreadLimit/{;h;s/^/#/p;x;s/ .*/ 50/;}' test.txt.1 > test.txt
Programming :: Bash Script To Toggle A Daemon (here Proftpd)?
Jan 5, 2010I want to create a script which toggles a daemon (here proftpd). On the first execution it should start it and on the next one it should stop it but first check if proftpd is already running or not (and make the decision to start or stop on that).I have created this script:
Code:
#!/bin/sh
# proftpd-toggle
[code]...
Programming :: Write Shell Script So That It Can Run As Service / Daemon
Mar 8, 2010Am not sure of the best way to go about writing a script. All I need at the moment is to start a java http server program at startup.How should I write languagetool.sh so as to be able to stop the script execution?
View 10 Replies View RelatedProgramming :: Make System Call From An Automatically Started Daemon?
Apr 2, 2011i'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.
Programming :: Bash Daemon Encounters Syntax Error After Midnight?
Feb 24, 2011I have a daemon script which wakes up every 5 minutes and checks the health of started processes. It works fine during the day but throws a syntax error just after midnight.Here is the log:
(02/22-23:49) Check all started processes
(02/22-23:54) Check all started processes
(02/22-23:59) Check all started processes
[code]....
Programming :: Daemon Process Design Which Acts As A Tcp Proxy Server?
Mar 8, 2010know abt daemon process and how it is used for acting as proxy server if nay tutorial is there for it .
View 3 Replies View RelatedProgramming :: Extracting Columns In Particular Order?
Jun 9, 2010Say I have a text file with10 columns. I need to reorder them based on a list of column numbers that will reorder them.
My problem is this:
If I want to cut out 5 columns (columns 1,2,3,9,10) in the order 1,10,2,9,3 then I have tried using:
Code: cut -f1,10,2,9,3 my_file.txt > reordered_file.txt But this just extracts the columns in order as if I used:
Code: cut -f1,2,3,9,10 my_file.txt > reordered_file.txt How can I cut these columns and place them into the new file in the order I specify?
While this might seem quite trivial, I will actually need to do this for a file containing ~14000 columns with ~12000 columns that I need to extract in a particular order.
Programming :: Setting The Umask To 0, Have Full Access To The Files Generated By The Daemon?
Jan 7, 2011To create a daemon, you need to execute these 2 lines (among others):Code: init log
umask 0 What do each of these do?I didn't find anything on the 1st line. (The queries returned mostly "the log of the init (process)".)Google cast some light on the 2nd line: By setting the umask to 0, we will have full access to the files generated by the daemon. Even if you aren't planning on using any files, it is a good idea to set the umask here anyway, just in case you will be accessing files on the filesystem.
Programming :: Reverse Bit Order In MIPS/SPIM?
Apr 27, 2009Here is what I have so far.The program receives and echos characters without syscalls. I am trying to add 2 procedures(rev7 and putint)Rev7: Reverses the least significant 7 bits and outputs $s2Putint: Prints the decimal value of $s2.When i run it, it echos the character then prints a "P". I have no idea where that comes from.Everything seems correct to me but I do not understand why it does not print the decimal digits
Code:
.data
hello:.asciiz "Enjoy This Program
[code]....
Programming :: MYSQL Select ORDER BY, GROUP BY Together?
Apr 19, 2010I'm writing a PHP script, and I need a top 10 result from a mysql query.I've tryed like this:select IP,sum(download) from traf group by IP order by ASC limit 0,10and my sql returnsmysql> select IP,sum(download) from traf group by IP order by ASC limit 0, 10;ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ASC limit 0, 10' at line 1As I red through Google this is not quite supported by mysql, so is there another way to do this?
View 5 Replies View RelatedUbuntu :: Open Source Virtual Machine - Study The Source In Order To Create My Own?
Jun 28, 2011Is there any open source virtual machine so i can study the source in order to create my own? i'm gonna write my own, so it doesNT matter if license does not allow further development of the code.
View 1 Replies View RelatedProgramming :: Avoid JNI In Order To Port A C/c++ STL Application To Android?
Jun 16, 2011I wonder if it is possible to avoid JNI in order to port a c/c++ STL application to android ?Do I have an alternative for calling C/C++ (STL) code ?
View 2 Replies View RelatedProgramming :: C Function To Reverse The Byte Order In A Double?
Aug 12, 2010I'm trying to write an extension to PHP which means coding in C. I'm really really rusty at C coding and was never very good at it.
Can anyone propose an efficient, safe, and [hopefully] future-proof way of reversing a double? Keep in mind that it should work on as many systems as possible and on 32- and 64-bit systems (and on ???-bit systems in the future?). Will the size of a 'double' ever change or will it always be 8 bytes?
I've tried this and it doesn't work...the compiler complains about "invalid operands to binary" because I'm trying bitwise shiftw on a non-integer.
Code:
x = (x>>56) |
((x<<40) & 0x00FF000000000000) |
((x<<24) & 0x0000FF0000000000) |
((x<<8) & 0x000000FF00000000) |
[Code]....
Programming :: When Parse A XML File - Should Rely On The Order Of Elements?
Feb 24, 2010When I parse a XML file, should I rely on the order of elements?
For example say we have:
Should I rely on the above order?
Would the following still be valid:
I'm trying to find out if a well formed XML document should have an ordered structure, or if it's still valid XML if it has no order.
General :: Use Sort Command For Its Ascending Order And Descending Order?
Aug 18, 2010in my text file of 5 columns 2 column is in DDMMYYYY format. (ie DATE OF BIRTH). how to use sort command for its ascending order and descending order.
Is the same can be use for the date format YYYYMMDD ?
Programming :: Bash Script: Order And Display On External File
Mar 12, 2010I'd like to create a script which allows me to order its data (let's say: Name, age, department and work start date) by date. And display the result in another file.
View 1 Replies View RelatedProgramming :: Shell Scripting - Value Disappears Depending On Argument Order
Mar 21, 2011Examples:
Code:
$ ./test.sh -a -c 2
operator is -gt
remcount is
^ value missing!
Code:
$ ./test.sh -b -c 2
operator is -lt
remcount is
^ value missing!
Yet when "-c" is the first argument, its value is present:
Code:
$ ./test.sh -c 2 -b
operator is -lt
remcount is 2
What could I do to ensure the value of "-c" is picked up regardless of the argument order?
Programming :: Use The Link Grammar Parser In Order To Do Some Part Of Speech Tagging?
May 12, 2011Probably a stupid sounding question, but bear with me please. I need to use the link grammar parser in order to do some part of speech tagging. It's freely available and works once you run the makefile or 'make' it or however it's correctly said. Thing is, it has a C API which I intend to use. And once I ran a bit of the sample code given in the documentation it gave a whole host of errors. This is very confusing because I'm including the path for the folder that has all the header files.
gcc -I/path/include/ filename.c. But it still gives me errors about not being able to find things that are clearly defined there. An hour of trudging around the internet tells me I need to 'compile' the API first. I'm not exactly sure how or if I'm supposed to do that. If someone could just shed light on this it would be greatly appreciated. I grow increasingly cynical to the musical swell of my tiny brain rattling in my skull.
Programming :: Bash: Rename Files In Alphabetical Order And Make Extensions Uppercase?
Oct 21, 2010I am trying to write a bash script that will extract a .cbr (.rar) file, traverse the extracted files in alphabetical order and rename them 001.JPG, 002.JPG, 003.JPG, etc.So far I only have this much to extract it:
Code:
#!/bin/bash
#
[code]....
Programming :: Handle Own Made Include Files In Order To Compile Program In SUSE 11.3?
May 1, 2011I have made two source files named as sum.c and average.cI have included sum.c in average.c
both files in Documents directory.when i compile average.ot followingerror"average.c:4:22: fatal error: sum.c: No such file or directorycompilation terminated.How to solve this issue?I have tried to copy sum.c to usrinclude folder but unable to copy