UHD gps_ctrl how to get lock status

Hi All

Using USRP N210 with GPSDO :
Is it possible to check GPS lock status ?
I have experience with some unit providing 10MHz, 1 PPS and ntp server,
locked on GPS network. But it needed always some time to acquire the
satellite signal after power up. So there were a status {UNLOCKED |
LOCKED}

Bastien