Systems programming on FreeBSD

[Ekkehard Morgenstern]

Hi,

(I don't know if this is the right mailing list, point me in the right 
direction if necessary.)

I would like to have some info regarding systems programming on FreeBSD. I 
have already looked at the available documentation (the handbooks, manpages), 
but there's some areas I cannot find any information about.

For instance, ioctl(). Where do I find information about device-specific 
ioctls? Do I always have to read the driver source? It can't be that this is 
all undocumented, or is it?

Please help!

regards,
Ekkehard.