Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

daemon(3) [bsd man page]

DAEMON(3)						     Library Functions Manual							 DAEMON(3)

NAME
daemon - run in the background SYNOPSIS
int daemon(nochdir, noclose) int nochdir, noclose; DESCRIPTION
The daemon function is for programs wishing to detach themselves from the controlling terminal and run in the background as system daemons. Unless the argument nochdir is non-zero, daemon changes the current working directory to the root (``/''). Unless the argument noclose is non-zero, daemon will redirect standard input, standard output and standard error to ``/dev/null''. ERRORS
The function daemon may fail and set errno for any of the errors specified for the library functions fork(2). SEE ALSO
fork(2), ioctl(2). HISTORY
The daemon function first appeared in 4.4BSD. 4th Berkeley Distribution February 3, 1995 DAEMON(3)

Check Out this Related Man Page

DAEMON(3)						     Linux Programmer's Manual							 DAEMON(3)

NAME
daemon - run in the background SYNOPSIS
#include <unistd.h> int daemon(int nochdir, int noclose); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): daemon(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) DESCRIPTION
The daemon() function is for programs wishing to detach themselves from the controlling terminal and run in the background as system dae- mons. If nochdir is zero, daemon() changes the calling process's current working directory to the root directory ("/"); otherwise, the current working directory is left unchanged. If noclose is zero, daemon() redirects standard input, standard output and standard error to /dev/null; otherwise, no changes are made to these file descriptors. RETURN VALUE
(This function forks, and if the fork(2) succeeds, the parent calls _exit(2), so that further errors are seen by the child only.) On suc- cess daemon() returns zero. If an error occurs, daemon() returns -1 and sets errno to any of the errors specified for the fork(2) and set- sid(2). CONFORMING TO
Not in POSIX.1-2001. A similar function appears on the BSDs. The daemon() function first appeared in 4.4BSD. NOTES
The glibc implementation can also return -1 when /dev/null exists but is not a character device with the expected major and minor numbers. In this case errno need not be set. SEE ALSO
fork(2), setsid(2) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2009-12-05 DAEMON(3)
Man Page

15 More Discussions You Might Find Interesting

1. Cybersecurity

Remote shell with Win 2000

I need to use the RSH command to run a shell script on my Unix box from Win 2000. I'm using the etc/hosts.equiv file for configuring Unix. In it I have the hostname and username as required. As a test, I enter the following on the Win 2000 dos command: rsh servername -l username df -k. The... (8 Replies)
Discussion started by: ebergh
8 Replies

2. UNIX for Dummies Questions & Answers

Printing a Directory Listing in Unix

Does anyone know if there is a way to print the list of files contained in a directory (besides screen print)? Thanks!!! (10 Replies)
Discussion started by: lfulton
10 Replies

3. IP Networking

DNS daemons

Does anyone know the command to start the DNS Daemon. I looked in the /etc/init.d/inetsvc file and it tells me what the text should look like. When I go to open the corresponding files they are encoded and I can't read them. So is there a command that will start the DNS daemon? If... (8 Replies)
Discussion started by: Deuce
8 Replies

4. UNIX for Dummies Questions & Answers

NOQUEUE: low on space ( have 0, SMTP-DAEMON needs 101 in /var/spool/mqueue)

hi, I'm in Solaris 2.8 env. When i'm trying to add a ftp user account , encountered "no space in disk" .. couldn't create any user. Then check the fs disk space with "df - k " and /var/adm/syslog .. got the below message. Jun 9 03:10:53 mail sendmail: NOQUEUE: low on space (have 0,... (10 Replies)
Discussion started by: Dolly
10 Replies

5. UNIX for Dummies Questions & Answers

UNIX community...help your Mac brother!

Hello, I have been a Macintosh user for many, many years. As you may know the latest MacOS ( OS X ) is UNIX based. (Please see http://www.apple.com/macosx/technologies/inside.html for more information.) Basically, I really have no idea where to start with UNIX...if anyone could take a quick... (7 Replies)
Discussion started by: makemead
7 Replies

6. Programming

calling a shared object from a daemon

Hi I have a multithreaded daemon(server) which will accept connections from various clients and sends back results to them. In order to serve my daemon clients, it has to establish a TCP connection to another server(vendor supplied which is listening on a specific TCP port) and gets the... (11 Replies)
Discussion started by: axes
11 Replies

7. UNIX for Dummies Questions & Answers

Starting MySQL daemon

I'm running a FreedBSD server with mysql 4.1. When I start mysqld via the command: # /usr/local/bin/safe_mysqld --user=mysql it starts the mysql db (I know because the websites are running off of it) but does not return to a prompt, it will let me type but will not respond unless I restart... (15 Replies)
Discussion started by: unispace
15 Replies

8. Shell Programming and Scripting

How to write a daemon in Unix?

Hi I have a directory where sometimes a file will come (in a name format say file001.txt). I want to run a job (.ksh file) as soon as a new file comes into the directory. How can I write a shell script which will run in the background and monitor arrival of new file in the directory? ... (11 Replies)
Discussion started by: sbasak
11 Replies

9. Solaris

Mail is not sent by cron daemon

Hello All, In SunOS 10, I have some cron jobs and it is running fine but the cron job outputs are not mailing to any acount of the system. In other OS, we have option like MAILTO variable or /dev/null to disable but in Sun I have no idea how it is disabled by default and how do I... (13 Replies)
Discussion started by: Tlogine
13 Replies

10. Solaris

Port status/Running daemon

Hi, I need to run an application (Hudson) listening to port 8080 on a remote Solaris server. I have managed to start that application and tried to access it with my browser from my local PC, but unsuccessfully. I need to find out what is blocking the access to that port (or any other). A... (9 Replies)
Discussion started by: JVerstry
9 Replies

11. UNIX for Dummies Questions & Answers

adm: [ID 70291 daemon.error]

Hi all I have been having this error in dmesg for quite some time and I'm not sure what's the errors associate with it. The closest I can get is the error in the fd2log, mv: cannot rename pacct.0 to SPacct.0.xxxx: Permission denied I initially solved the problem by setting the folder group... (9 Replies)
Discussion started by: xiaochensg
9 Replies

12. Programming

Is it possible to call remote function in another daemon?

Hi, Is it possible to call a remote function in another daemon? Here is the setup: I have two daemons daemon A with function "s" and daemon B with function "k". I need a way function "s" from daemon A to call a function "k" from daemon B and pass some arguments. When the request is ... (13 Replies)
Discussion started by: rcbandit
13 Replies

13. Red Hat

Can't start NTOP service/daemon

I have installed version of ntop 4.0.3 by guide. But I can't start ntop daemon/service. I didn't find a service file for starting. During the installation there was no problem only want to RRDTool so I installed that. Now there is no necessary package required. I didn't find in /etc/init.d/... (9 Replies)
Discussion started by: getrue
9 Replies

14. Shell Programming and Scripting

Daemon not executing shell file

Hey guys, I'm rather new to scripting with the shell (I started on Wednesday) and encountered a problem that left me clueless. I moved to an old house recently and the sound of the 433mhz door bell is too quiet. Since I always wanted to start playing around with a raspberry pi and my wife... (11 Replies)
Discussion started by: matthes0815
11 Replies

15. HP-UX

Svhptdaemon

Hello all and happy new year. I have an HP-UX system running HP-UX B.11.31 U ia64 1161301486 and it has a weird process called "svhptdaemon" that's using 100% of the CPU. Anyon knows what this process is? I've tried googling the answer but even Google doesn't know :eek: CPU TTY PID... (13 Replies)
Discussion started by: bbbngowc
13 Replies

Featured Tech Videos