This is a tool for sending an instance of gpsd commands over its control socket to add or remove devices from the daemon's device list. It is not intended to be called by users, but rather by the Linux hotplug system and similar facilities.
The action argument may be "add" or "remove". If no daemon instance is running when an add is requested, this program will launch one.
The "device" argument should be the pathname of a device. A device on the list will be opened to read sensor data whenever a client requests a watch.
Two environment variables are
GPSD_SOCKET sets the location of the
control socket. It defaults to
/var/run/gpsd.sock if the effective user ID of
this program is root,
may be a list of options to be passed to gpsd
when this tool launches it. It defaults to an empty string.
Eric S. Raymond