07-19-2011
Perhaps you need to install the correct module/driver in order for it to load correctly.
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SEM(4) BSD Kernel Interfaces Manual SEM(4)
NAME
sem -- POSIX semaphores
SYNOPSIS
To compile this driver into the kernel, place the following line in your kernel configuration file:
options P1003_1B_SEMAPHORES
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
sem_load="YES"
To load the driver as a module at run-time, run the following command as root:
kldload sem
DESCRIPTION
The sem facility provides system calls used by the standard C library (libc) to implement POSIX semaphores. This facility offers support for
such functions as sem_init() and sem_wait(). It is available both as a kernel option for static inclusion and as a dynamic kernel module.
SEE ALSO
sem_destroy(3), sem_getvalue(3), sem_init(3), sem_open(3), sem_post(3), sem_wait(3), config(8), kldload(8), kldunload(8)
HISTORY
The sem facility appeared in FreeBSD 5.0.
BSD
February 7, 2014 BSD