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Full Discussion: Should a UNIX daemon process close open fds?
Top Forums UNIX for Dummies Questions & Answers Should a UNIX daemon process close open fds? Post 30570 by kunalashar on Thursday 24th of October 2002 01:30:30 AM
Old 10-24-2002
Should a UNIX daemon process close open fds?
I have a UNIX daemon process that's been started by a parent process, an application server.
The behavior of this daemon process is to inherit and use the app
server's file descriptors (ports/sockets).
When I shutdown the app server, the daemon continues to run, because there may be other applications that want to use it.
However, the app server won't restart, because the daemon process is holding its parents' ports.
There is a debate as to whether its the app server's or the daemon's responsibility to close the file descriptors (say, using fcntl(...)).
Which process has the responsibility of closing the open file
descriptors?
Richard Steven, in his Advanced Unix programming book says that the daemon should do it, but the people who created the daemon say the Posix way is better.
Any takers?
Thanks in advance,
Kunal
 

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LEARN ABOUT OSX

pcastctl

pcastctl(8)						    BSD System Manager's Manual 					       pcastctl(8)

NAME

     pcastctl -- Podcast Producer daemons control interface

SYNOPSIS

     pcastctl status target on|off|start|stop|restart

OPTIONS

     The available options are as follows:

     status			    print status of running daemons

     target			    affect agent or server daemon

     start|stop|restart 	    explicitly start/stop/restart daemon.  Note that 'restart' will kill all instances of a given daemon, as will
				    'stop' if none is specified in the pid file.

RETURN VALUES

     0 Completed succesfully.

     1 Action failed

     10 Not run as root.

     50 Target not recognized: use 'a', or 's'.

     51 Action not recognized: use start|stop|restart

     52 Executables not found; may need to reinstall Podcast Producer.

     53 Process directory not found; may need to reinstall Mac OS X.

     54 Timeout waiting for action to complete.

     55 Launchd manipulation failure.

FILES

     /usr/libexec/podcastproducer/pcastagentd
	     Podcast Producer agent daemon

     /usr/share/podcastproducer/pcastserverd
	     Podcast Producer server daemon

     /var/run/pcastagentd.pid
	     Podcast Producer agent process ID

     /var/run/pcastserverd.pid
	     Podcast Producer server process ID

     /System/Library/LaunchDaemons/com.apple.pcastagentd.plist
	     Launchd agent daemon control file

     /System/Library/LaunchDaemons/com.apple.pcastserverd.plist
	     Launchd server daemon control file

EXAMPLES

     status of Podcast Producer agent daemon

	   $ pcastctl agent status

     edit launchd configuration to launch server on system startup

	   $ pcastctl server on

DIAGNOSTICS

     Warning: Warning: ## copies of (pcastagentd|pcastserverd) already running

     Trying to launch another daemon when one or more already running; will usually succeed, but may cause unpredictable behavior.
     See also RETURN VALUES, above.

ERRORS

     Error: failed to launch (executable)

     Tried to start/restart a give daemon, but failed.

     Error: process 'executable' not currently running

     Tried to kill a process which did not exist.

SEE ALSO

     pcast(1) launchd(8)

HISTORY

     This program was first introduced in Mac OS X 10.5 "Leopard".  It was inspired by xgridctl(8).

BUGS

     pcastctl(8) uses kill -TERM to allow the daemons a chance to die gracefully; there is currently no way to force a kill -KILL.

     Bug reports can be sent to bugreport.apple.com

     Feedback can be sent to podcastproducer@apple.com

Mac OS								September 29, 2004							    Mac OS
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