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.Dd February 7, 2014 .Dt SEM 4 .Os .Sh NAME .Nm sem .Nd POSIX semaphores .Sh SYNOPSIS To compile this driver into the kernel, place the following line in your kernel configuration file: d -ragged -offset indent .Cd "options P1003_1B_SEMAPHORES" .Ed
p Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : d -literal -offset indent sem_load="YES" .Ed
p To load the driver as a module at run-time, run the following command as root: d -ragged -offset indent kldload sem .Ed .Sh DESCRIPTION The .Nm facility provides system calls used by the standard C library
q Pa libc to implement .Tn POSIX semaphores. This facility offers support for such functions as .Fn sem_init and .Fn sem_wait . It is available both as a kernel option for static inclusion and as a dynamic kernel module. .Sh SEE ALSO .Xr sem_destroy 3 , .Xr sem_getvalue 3 , .Xr sem_init 3 , .Xr sem_open 3 , .Xr sem_post 3 , .Xr sem_wait 3 , .Xr config 8 , .Xr kldload 8 , .Xr kldunload 8 .Sh HISTORY The .Nm facility appeared in .Fx 5.0 .