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PKON(2) System Calls Manual PKON(2) NAME pkon, pkoff - establish packet protocol SYNOPSIS pkon(fd, size) pkoff(fd) DESCRIPTION Pkon establishes packet protocol (see pk(4)) on the open character spe- cial file whose file descriptor is fd. Size is a desired packet size, a power of 2 in the range 32<=size<=4096. The size is negotiated with a remote packet driver, and a possibly smaller actual packet size is returned. An asynchronous line used for packet communication should be in raw mode; see tty(4). Pkoff turns off the packet driver on the channel whose file descriptor is fd. SEE ALSO pk(4), pkopen(3), tty(4), signal(2) DIAGNOSTICS Pkon returns -1 if fd does not describe an open file, or if packet com- munication cannot be established. Pkoff returns -1 for an unknown file descriptor. Writing on a packet driver link that has been shut down by close or pkoff at the other end raises signal SIGPIPE in the writing process. PKON(2)