Use in OpenBSD base.

Kernel implementation using vnodes performs well.

A number of base programs now use unveil.

acme-client acpidump dev_mkdb dhcpd makefs ntpd portmap pstat rarpd rebound sensorsd spamdb syslogd syslogd vipw vmctl ps fsck fsck_* nologin pflogd savecore shutdown biff calendar ctfconv ctfdump doas encrypt from kdump last look mesg mixerctl nc nm sndiod su tcpbench tty users wall who

Many of these were done while finalizing basic semantics

     Have been dribbling into the tree after the feature was committed

More to come.