ioctl(2),
recv(2),
socket(2)Stuart Sechrest, An Introductory 4.4BSD Interprocess Communication Tutorial.
(see
/usr/share/doc/psd/20.ipctut)
Samuel J. Leffler, Robert S. Fabry, William N. Joy, Phil Lapsley, Steve Miller, Chris Torek, Advanced 4.4BSD IPC Tutorial.
(see
/usr/share/doc/psd/21.ipc)