__sys_fcntl() definition ?

[Saifi Khan]

Hi:

While working through the FreeBSD 6.2 codebase,
I saw the following functions referred at multiple places.

__sys_fcntl()
__sys_open()
__sys_write()
...

Can somebody point out the file which contains the implementation
of the __sys_* functions ?

Thanks in advance.

thanks
Saifi.