HXFS(4)                                                   HXFS(4)

     NAME
          hxfs  - hexamite active badges file system

     SYNOPSIS
          hxfs [ -A ] [ -d ] [ -s srv ] [ -m mnt ] [ -n addr ] [ -c
          config ] [ -V volspec ] iofile

     DESCRIPTION
          Hexamite provides active badges that can be used to provide
          location for users and devices. There are ultrasound micro-
          phones intalled in the space that receive sound beacons from
          the active badges carried by users.  The only button on each
          badge adjusts the interval between beacons. It cycles
          between a power-off state and different intervals. The led
          on the badge blinks on each beacon.

          Hxfs services a file system that includes a file per badge.
          Each file contains the current location (or locations) for
          the badge. There can be more than one active location if
          several receivers are in range with the badge. Only the
          three most recent locations are kept, sorted from newest to
          oldest.

          Names for badges and locations are configured in
          /sys/lib/hxconf, or config when supplied. This file contains
          a series of id=name expressions, which map the hexamite
          identifier id (printed on the badge) to name.

          Note that this driver is not intended to provide location
          information for programs, /who, /where, and /what should be
          used instead for that purpose. Other processes can use hxfs
          to update such directories according to heuristics accept-
          able for the users involved.

          Hexamite receivers are networked using telephone cable and
          gatewayed through a serial port to the rest of the system.
          The iofile parameter is the file used to obtain raw sensor
          data, usually a serial port.

          Other options determine debug and how to export the file
          system and announce the volume, like said in planb(4).

     SOURCE
          /sys/src/cmd/hxfs.c

     FILES
          /sys/lib/hxconf