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HOTPLUG(8)			    Linux Programmer's Manual			       HOTPLUG(8)

       hotplug - Linux hotplugging support scripts

       hotplug [ help | --help | NAME ]

       hotplug	is  a  program which is used by the kernel to notify user mode software when some
       significant (usually hardware-related) events take place.  An example is  when  a  USB  or
       Cardbus	device	has  just  been plugged in.  This is useful for automatically loading and
       setting up drivers, packaged either as kernel modules or as user mode programs.

       The hotplug program path name is  registered  in  /proc/sys/kernel/hotplug,  and  normally
       holds  the  value  /sbin/hotplug.  Except for specialized configurations such as initrd(4)
       configurations, that identifies	a  shell  script  which  delegates  to	specific  "policy
       agents",  /etc/hotplug/NAME.agent.   The  name  of the agent is given by the kernel as the
       first command-line parameter.  The name corresponds to a specific kernel  subsystem  whose
       events it processes (e.g. "usb", "pci", "net" etc.).

       Information  about  an  event is usually passed to agents in the form of environment vari-
       ables.  Most agents accept a "ACTION" variable that describes the type of the  event.   It
       can be, for example, "add" or "remove" to signify that some device has just been connected
       to or disconnected from the system respectively.  In such requests, agents are also  given
       variables  describing  at the device (and its location) so that they can choose the appro-
       priate drivers to set up.

       hotplug agents aren't necessarily called only by the kernel though.  While the OS is  ini-
       tializing,  the "cold-plugging" case, the hotplug script in /etc/init.d/hotplug is invoked
       to make sure that all device connected at boot are properly configured, applying the  same
       rules as if they were connected later.

       /proc/sys/kernel/hotplug   specifies hotplug program path
       /sbin/hotplug		  hotplug program (default path name)
       /etc/hotplug/*		  hotplug files
       /etc/hotplug/NAME.agent	  hotplug subsystem-specific agents
       /etc/hotplug/NAME*	  subsystem-specific files, for agents
       /etc/hotplug/NAME/*	  driver setup scripts, invoked by agents


       The http://linux-hotplug.sourceforge.net/ web site.

       hotplug is developed by Linux Hotplugging Project http://linux-hotplug.sourceforge.net/

       This  manual  page  was	originally written by Fumitoshi UKAI <ukai@debian.or.jp>, for the
       Debian GNU/Linux system (but may be used by others), based on original Japanese version of

					  February 2001 			       HOTPLUG(8)
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