Visit Our UNIX and Linux User Community


What is a daemon process?


 
Thread Tools Search this Thread
Top Forums Programming What is a daemon process?
# 1  
Old 02-27-2002
Tools What is a daemon process?

This is gonna seem really silly to almost evryone here - but I need to know :

what is a daemon process?

Thanks
# 2  
Old 02-27-2002
A daemon process has no controlling terminal. It cannot open /dev/tty. If you do a "ps -ef" and look at the tty field, all daemons will have a ? for the tty.

Most daemons tend to last a long time, be owned by root, and do something useful. But you really can't count on any of these thing being true.

The lack of a controlling terminal is the real defining characteristic.
This User Gave Thanks to Perderabo For This Post:
# 3  
Old 02-27-2002
MySQL So what you mean is....

So bacically, they are a typoe of monitor process but dont actually do anything..... Or am I way off the mark here????
# 4  
Old 02-27-2002
You're way off the mark. Asking what a daemon does in like asking what a program does....the answer depends on the specific example.

cron, inetd, syslogd all run as daemons and they do a lot. But it is easy to write a daemon that does nothing but just monitor something. It's also easy to write a daemon that does nothing at all.
# 5  
Old 03-07-2002
A second explanation, not as detailed

For simple unix programmers like me, a daemon is just a process that runs in the background, usually waiting for something to happen that it is capable of working with, like a printer daemon is waiting for print commands.
# 6  
Old 03-07-2002
MySQL Daemons.....

Cheers guys - that explains the daemon issue for me....
# 7  
Old 03-08-2002
This paper may help give you some more
insights into daemon process programming...

Moderator's Comments:
Mod Comment Link below does not work after all these years.

http://skywalker.mis.boun.edu.tr/~karakas/daemon.php

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Programming

Daemon process

I wish to make a process run in the background, but only one instance of it, and not many, so when the program is loaded, it has to check whether another instance of the same program is running and if so to exit. How do I do this ? (4 Replies)
Discussion started by: sundaresh
4 Replies

2. Shell Programming and Scripting

run this script as a daemon process

Hi, HI , I have a simple script that moves files from one folder to another folder, I have already done the open-ssh server settings and the script is working fine and is able to transfer the files from one folder to another but right now I myself execute this script by using my creditianls to... (3 Replies)
Discussion started by: nks342
3 Replies

3. UNIX for Advanced & Expert Users

Needs help in launching a console application with the help of daemon process

Hi All, I am facing problem in launching a application with the help of a daemon process. Actually the application is based on command line that reads various commands for controlling the application from the console and accordingly executes those commands. The application always interact with... (3 Replies)
Discussion started by: gopallinux
3 Replies

4. Shell Programming and Scripting

Diff between Bg and daemon process

Dear Unix Gurus, Plz provide major diff between background process and daemon process. Is it control available for daemon process?. (3 Replies)
Discussion started by: kkl
3 Replies

5. Programming

How to find if a process a daemon ?

I have a scenario where I need to find if a process is a daemon process or not. This check needs to be done from within the process. I know there are no direct API's to do so. I have explored these options. 1. ctermid() - this can be unsuccessful as per the man pages 2. int devtty; if ((devtty... (7 Replies)
Discussion started by: vino
7 Replies

6. UNIX for Dummies Questions & Answers

How to write Pro*C daemon process using multithreading?

Hello, I am new to this forum and this is my first post here... I have never worked on either Pro*C or Multithreading..Now, i have to write a Pro*C, Multithreading daemon process.. I dont know where to start.. Can anybody help me with examples? 1. need to write a Pro*C multithreading... (0 Replies)
Discussion started by: kachiraju
0 Replies

7. Shell Programming and Scripting

How to starting process as daemon using ssh command?

Hello, I need to run a command on remote Linux using the ssh command from my local machine. I am able to execute the command on remote machine using ssh but it's behaving strangely. The command is supposed to start a daemon process on remote linux box and the control should return back to me... (5 Replies)
Discussion started by: nitinshukla
5 Replies

8. Linux

daemon process

how i will write the daemon process,if any body have sample daemon process send me. (1 Reply)
Discussion started by: suresh_rupineni
1 Replies

9. UNIX for Advanced & Expert Users

zombie daemon process!!

My daemon process is the child of init and init has the responsibility to remove it, once it turns zombie. But I want to ask why the daemon process which is child of init turns zombie in the first place. What measures I have to take to avoid this? rish (1 Reply)
Discussion started by: rish2005
1 Replies

10. Programming

Daemon process

Hi, I have to write a daemon process, which performs certain operations in the background. Now since it performs operations in the background, it should not display anything to the standard output. The problem is that it still displays, text on standard output. Can anyone tell me (it is... (2 Replies)
Discussion started by: s_chordia
2 Replies

Featured Tech Videos