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apmd - Advanced Power Management monitor daemon



      apmd - Advanced Power Management monitor daemon


      apmd [-d] [-f -file] [-v]


      Apmd monitors the occurrence of the specified Advanced Power Management
      (APM) events and, if one of the events occurs, it executes the sequence
      of commands corresponding to the event.  Only the events specified in the
      configuration file are notified to apmd; all other events are ignored.
      For each event posted by the APM BIOS, apmd invokes the sequence of com‐
      mands specified in the configuration file.  When apmd is running with
      monitoring suspend/standby requests, the kernel will not process those
      requests.  Therefore, if you wish action to be taken when these events
      occur, you need to explicitly configure the appropriate commands or
      built-in functions in the configuration file.
      Apmd recognizes the following runtime options:
      -d       Starts in debug mode.  This causes apmd to execute in the fore‐
               ground instead of in daemon mode.
      -f file  Specifies a different configuration file file to be used in
               place of the default /etc/apmd.conf.
      -v       Verbose mode.
      When apmd starts, it reads the configuration file (/etc/apmd.conf as
      default) and notifies the set of events to be monitored to the APM device
      driver.  When it terminates, the APM device driver automatically cancels
      monitored events.
      If the apmd process receives a SIGHUP, it will reread its configuration
      file and notify the APM device driver of any changes to its configura‐
      Apmd uses the device /dev/apmctl to issue ioctl(2) requests for monitor‐
      ing events and for controlling the APM system.  This device file is
      opened exclusively, so only a single apmd process can be running at any
      When apmd receives an APM event, it forks a child process to execute the
      commands specified in the configuration file and then continues listening
      for more events.  The child process executes the commands specified, one
      at a time and in the order that they are listed.
      While apmd is processing the command list for SUSPEND/STANDBY requests,
      the APM kernel device driver issues notifications to APM BIOS once per
      second so that the BIOS knows that there are still some commands pending,
      and that it should not complete the request just yet.
      The apmd daemon creates the file /var/run/, and stores its pro‐
      cess id there.  This can be used to kill or reconfigure apmd.
      The structure of the apmd configuration file is quite simple.  For exam‐
      apm_event SUSPENDREQ {
             exec "sync && sync && sync";
             exec "sleep 1";
             exec "zzz";
      will cause apmd to receive the APM event ‘SUSPENDREQ’ (which may be
      posted by an LCD close), run the ‘sync’ command 3 times and wait for a
      while, then execute zzz (apm -z) to put the system in the suspend state.
            The  apm_event keyword
                ‘apm_event’ is the keyword which indicates the start of config‐
                uration for each events.
            APM events
                If you wish to execute the same commands for different events,
                the event names should be delimited by a comma.  The following
                are valid event names:
                - Events ignored by the kernel if apmd is running:
                      SUSPENDREQ      should include sync in the command list,
                      USERSUSPENDREQ  should include sync in the command list,
                      BATTERYLOW      only zzz should be specified in the com‐
                                      mand list.
                - Events passed to apmd after kernel handling:
                Other events will not be sent to apmd.
            command line syntax
                In the example above, the three lines begining with ‘exec’ are
                commands for the event.  Each line should be terminated with a
                semicolon.  The command list for the event should be enclosed
                by ‘{’ and ‘}’.  apmd uses /bin/sh for double-quotation
                enclosed command execution, just as with system(3).  Each com‐
                mand is executed in order until the end of the list is reached
                or a command finishes with a non-zero status code.  apmd will
                report any failed command’s status code via syslog(3) and will
                then reject the request event posted by the APM BIOS.
            Built-in functions
                You can also specify apmd built-in functions instead of command
                lines.  A built-in function name should be terminated with a
                semicolon, just as with a command line.  The following built-in
                functions are currently supported:
                - reject:
                      Reject last request posted by APM BIOS.  This can be used
                      to reject a SUSPEND request when the LCD is closed and
                      put the system in a STANDBY state instead.


      Sample configuration commands include:
      apm_event SUSPENDREQ {
              exec "/etc/rc.suspend";
      apm_event USERSUSPENDREQ {
              exec "sync && sync && sync";
              exec "sleep 1";
              exec "apm -z";
              exec "/etc/rc.resume";
      # resume event configuration for serial mouse users by
      # reinitializing a moused(8) connected to a serial port.
      #apm_event NORMRESUME {
      #       exec "kill -HUP ‘cat /var/run/‘";
      # suspend request event configuration for ATA HDD users:
      # execute standby instead of suspend.
      #apm_event SUSPENDREQ {
      #       reject;
      #       exec "sync && sync && sync";
      #       exec "sleep 1";
      #       exec "apm -Z";


      apm(4), apm(8)


      Mitsuru IWASAKI 〈〉
      KOIE Hidetaka 〈〉
      Some contributions made by
      Warner Losh 〈〉,
      Hiroshi Yamashita 〈〉,
      Yoshihiko SARUMARU 〈〉,
      Norihiro Kumagai 〈〉,
      NAKAGAWA Yoshihisa 〈〉, and
      Nick Hilliard 〈〉.


      The apmd command appeared in FreeBSD 3.3.


Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.

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