There may be times when you manage to get your system into a
state where using any of the Firebird utilites (isql, gbak, gsec,
etc.) gives you the message "semget failed". One surefire way to
do this is to build and install the port. :) If this happens,
make sure that the lock manager is not running and its semaphores
have been removed. The former can be accomplished with 'ps ax
|grep gds' and 'kill'; the latter with 'ipcs -s' and 'ipcrm -s'.

For example, after building and installing the port, you will
probably go through something like this:

# isql /usr/interbase/isc4.gdb
Statement failed, SQLCODE = -902

operating system directive semget failed
-No such file or directory

# ipcs -s
Semaphores:
T ID KEY MODE OWNER GROUP
s 1310720 252034728 --rw-rw-rw- root wheel

# ipcrm -s 1310720

and you should be in business.

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Семафоры для FireBird в ядре FreeBSD