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Shell Programming and Scripting
last command
Post 302634219 by vlm on Thursday 3rd of May 2012 03:44:04 AM
05-03-2012
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LEARN ABOUT REDHAT
hotplug
HOTPLUG(8) Linux Programmer's Manual HOTPLUG(8) NAME
hotplug - Linux hotplugging support scripts SYNOPSIS
hotplug [ help | --help | NAME ] DESCRIPTION
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 driv- ers, 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 special- ized configurations such as initrd(4) configurations, that identifies a shell script which delegates to specific "policy agents", /etc/hot- plug/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 variables. 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 dis- connected 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 appropriate drivers to set up. hotplug agents aren't necessarily called only by the kernel though. While the OS is initializing, 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. FILES
/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 SEE ALSO
initrd(4) The http://linux-hotplug.sourceforge.net/ web site. AUTHORS
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 manpage. February 2001 HOTPLUG(8)