acpid man page on aLinux

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acpid(8)							      acpid(8)

       acpid - Advanced Configuration and Power Interface event daemon

       acpid [options]

       acpid  is designed to notify user-space programs of ACPI events.	 acpid
       should be started during the system boot, and will run as a  background
       process,	 by default.  It will open an events file (/proc/acpi/event by
       default) and attempt to read whole lines.  When a line is received  (an
       event),	acpid will examine a list of rules, and execute the rules that
       match the event.

       Rules are defined by simple configuration files.	 acpid will look in  a
       configuration  directory	 (/etc/acpi/events  by default), and parse all
       files that do not begin with a period ('.').  Each file must define two
       things:	an  event  and an action.  Any blank lines, or lines where the
       first character is a pound sign ('#') are  ignored.   Extraneous	 lines
       are  flagged  as	 warnings,  but	 are  not  fatal.  Each line has three
       tokens: the key, a literal equal sign, and the value.  The key  can  be
       up  to 63 characters, and is case-insensitive (but whitespace matters).
       The value can be up to 511 characters, and is case and whitespace  sen‐

       The event value is a regular expression (see regcomp(3)), against which
       events are matched.

       The action value is a commandline, which will be	 invoked  via  /bin/sh
       whenever	 an  event matching the rule in question occurs.  The command‐
       line may include shell-special characters, and they will be  preserved.
       The  only  special  characters in an action value are "%" escaped.  The
       string "%e" will be replaced by the literal text of the event for which
       the action was invoked.	This string may contain spaces, so the comman‐
       dline must take care to quote the "%e" if it wants a single token.  The
       string  "%%"  will be replaced by a literal "%".	 All other "%" escapes
       are reserved, and will cause a rule to not load.

       This feature allows multiple rules to be defined	 for  the  same	 event
       (though	no  ordering is guaranteed), as well as one rule to be defined
       for multiple events.  To force acpid to reload the rule	configuration,
       send it a SIGHUP.

       In  addition  to	 rule  files, acpid also accepts connections on a UNIX
       domain socket (/var/run/acpid.socket by default).  Any application  may
       connect	to  this  socket.  Once connected, acpid will send the text of
       all ACPI events to the client.  The client has  the  responsibility  of
       filtering  for messages about which it cares.  acpid will not close the
       client socket except in the case of a SIGHUP or acpid exiting.

       acpid will log all of it's activities, as well as the stdout and stderr
       of any actions to syslog.

       All  the	 default  file and directories can be changed with commandline

       -c, --confdir directory
		   This option changes the directory in which acpid looks  for
		   rule configuration files.  Default is /etc/acpi/events.

       -d, --debug This option increases the acpid debug level by one.	If the
		   debug level is non-zero, acpid will run in the  foreground,
		   and will log to stderr, in addition to the regular syslog.

       -e, --eventfile filename
		   This	 option	 changes the event file from which acpid reads
		   events.  Default is /proc/acpi/event.

       -f, --foreground
		   This option keeps acpid in the foreground by not forking at

       -g, --socketgroup groupname
		   This	 option changes the group ownership of the UNIX
		   domain socket to which acpid publishes events.

       -m, --socketmode mode
		   This option changes	the  permissions  of  the  UNIX
		   domain  socket  to  which  acpid  publishes	events.
		   Default is 0666.

       -s, --socketfile filename
		   This option changes the  name  of  the  UNIX	 domain
		   socket    which    acpid    opens.	  Default    is

       -S, --nosocket filename
		   This option tells acpid not to open	a  UNIX	 domain
		   socket.   This  overrides the -s option, and negates
		   all other socket options.

       -v, --version
		   Print version information and exit.

       -h, --help  Show help and exit.

       This example - placed in /etc/acpi/events/power - will shut down
       your system if you press the power button.

       action=/usr/local/sbin/ "%e"

       The  script gets called and will see the complete event
       string as parameter $1.

       acpid should work on any linux kernel released since 2003.


       There are no known bugs.	  To  file  bug	 reports,  see	AUTHORS

       regcomp(3), sh(1), socket(2), connect(2)

       Tim Hockin <>


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