November 2005
Beginner to intermediate
528 pages
24h 11m
English
Content preview from Mac OS X Tiger in a Nutshell
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launchd
Mac OS X Tiger introduces the latest and greatest startup scheme, launchd. It has launch-on-demand capabilities and also supports on-demand launching via Mach ports (as does the mach_init.d scheme). launchd also offers the ability to launch on demand based on file system and Unix domain socket events. The property list (.plist) files for system-installed daemons are in /System/Library/LaunchDaemons. Locally-installed daemons can be installed into /Library/LaunchDaemons. Table 11-1 lists and describes the system-installed daemons, most of which have counterparts in Linux and Unix systems.
You can control launch daemons with the launchctl utility. For example, to enable and load a daemon that’s disabled (there will be a Disabled key in its property list file), use launchctl load -w followed by the path to the property list. For example, the following command would be enabled and start the telnet server:
# launchctl load -w /System/Library/LaunchDaemons/telnet.plist
You can stop and disable this daemon with unload -w:
# launchctl unload -w /System/Library/LaunchDaemons/telnet.plist
For more information, see launchctl in Chapter 2, or the launchctl manpage.
Table 11-1. Default Mac OS X launch daemons
|
Property List File |
Description |
Enabled by default? |
|
bootps.plist |
Starts the DHCP/BOOTP daemon. |
No |
|
com.apple.atrun.plist |
Launches the atrun daemon. |
Yes |
|
com.apple.KernelEventAgent.plist |
Runs the kernel event agent, which responds to low-level kernel events (such as disk ... |
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