dpd(8) BSD System Manager's Manual dpd(8)NAME
dpd -- Display Port daemon.
SYNOPSIS
dpd
DESCRIPTION
The dpd executable is a daemon intended to listen for Command + F2 on the iMac to switch to external display input mode upon display port
hot-plug. This feature is known as Target Display Mode. It disables display and idle sleep while in external display mode and launches an
audio tool called dpaudiothru to capture audio input and route it into the mac unit. To go back to normal mac mode, unplug the display port
or press Command + F2 again, which will restore all settings.
dpd should only be run via launchd.
FILES
/usr/libexec/dpd The daemon
/System/Library/LaunchDaemons/com.apple.dpd.plist The launchd configuration plist
Darwin February 18, 2009 Darwin
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launchd(8) BSD System Manager's Manual launchd(8)NAME
launchd -- System wide and per-user daemon/agent manager
SYNOPSIS
launchd [-d] [-D] [-s] [-S SessionType] [-- command [args ...]]
DESCRIPTION
launchd manages processes, both for the system as a whole and for individual users. The primary and preferred interface to launchd is via
the launchctl(1) tool which (among other options) allows the user or administrator to load and unload jobs. Where possible, it is preferable
for jobs to launch on demand based on criteria specified in their respective configuration files.
During boot launchd is invoked by the kernel to run as the first process on the system and to further bootstrap the rest of the system.
You cannot invoke launchd directly.
ENVIRONMENTAL VARIABLES
LAUNCHD_SOCKET
This variable is exported when invoking a command via the launchd command line. It informs launchctl how to find the correct launchd
to talk to.
NOTES
In Darwin, the canonical way to launch a daemon is through launchd as opposed to more traditional mechanisms or mechanisms provided in ear-
lier versions of Mac OS X. These alternate methods should be considered deprecated and not suitable for new projects.
In the launchd lexicon, a "daemon" is, by definition, a system-wide service of which there is one instance for all clients. An "agent" is a
service that runs on a per-user basis. Daemons should not attempt to display UI or interact directly with a user's login session. Any and all
work that involves interacting with a user should be done through agents.
If you wish your service to run as a certain user, in that user's environment, making it a launchd agent is the ONLY supported means of
accomplishing this on Mac OS X. In other words, it is not sufficient to perform a setuid(2) to become a user in the truest sense on Mac OS X.
FILES
~/Library/LaunchAgents Per-user agents provided by the user.
/Library/LaunchAgents Per-user agents provided by the administrator.
/Library/LaunchDaemons System-wide daemons provided by the administrator.
/System/Library/LaunchAgents Per-user agents provided by Mac OS X.
/System/Library/LaunchDaemons System-wide daemons provided by Mac OS X.
SEE ALSO launchctl(1), launchd.plist(5),
Darwin 1 May, 2009 Darwin