## host_get_clock_service

Function - Return a send right to a kernel clock's service port.

### SYNOPSIS

    kern_return_t   host_get_clock_service
                    (host_t                                    host,
                     clock_id_t                                  id,
                     clock_t                             clock_name);

### PARAMETERS

host
  [in host-name send right] The name (or control) port for the host owning the clock.

id
  [in scalar] The identification of the desired kernel clock. These values are defined in \*L\*O. Although an implementation may define additional values, the following values are always defined (although only the REALTIME clock is required to be implemented):

  REALTIME_CLOCK
    A moderate resolution clock service that (typically) tracks time since the system last boot.

  BATTERY_CLOCK
    A (typically) low resolution clock (to the second) that survives power failures or service outages.

  HIGHRES_CLOCK
    A high resolution clock.

clock_name
  [out clock-name send right] Name port for the clock.

### DESCRIPTION

The host_get_clock_service function returns a send right to the name port for a kernel clock object. This right is used to get the time and resolutions of the clock and to set clock alarms.

### RETURN VALUES

Only generic errors apply.

### RELATED INFORMATION

Functions: clock_get_time, clock_get_attributes, clock_map_time, clock_sleep, clock_alarm, host_get_clock_control.