uu_lock(3) on FreeBSD
The text dcf6f8f13c55, as FreeBSD 16.0-CURRENT (2026-10-27), FreeBSD 15.1-RELEASE, FreeBSD 15.0-RELEASE, FreeBSD 14.5-RELEASE, FreeBSD 14.4-RELEASE shipped it. The page shows this text now.
acquire and release control of a serial device