Ubuntu Feisty 7.04 manual page repository

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Provided by: acpid_1.0.4-5ubuntu6_i386



        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 fit to a runparts style naming convetion.  This  means  that
        files  containing  a  dot and contain characters different from a-z and
        0-9 would be ignored. Debian implementation differs at this point  from
        standard  acpid.  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 char‐
        acters, and is case and whitespace sensitive.
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 a log file (/var/log/acpid by default).
        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 stdout/stderr, rather than a log file.
        -e, --eventfile filename
                    This  option  changes the event file from which acpid reads
                    events.  Default is /proc/acpi/event.
        -g, --socketgroup groupname
                    This option changes the group ownership of the UNIX  domain
                    socket to which acpid publishes events.
        -l, --logfile filename
                    This  option  changes  the  log file to which acpid writes.
                    Default is /var/log/acpid.
        -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 /var/run/acpid.socket.
        -S, --nosocket filename
                    This option tells acpid not to open a UNIX  domain  socket.
                    This  overrides the -s option, and negates all other socket
        -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/power.sh "%e"
        The  script power.sh gets called and will see the complete event string
        as parameter $1.


        Please make sure you are using the latest ACPI code possible.  This  is
        available from




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


        Tim Hockin <thockin@sun.com>


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