.\" $NetBSD: imp.4,v 1.3 1994/11/30 16:22:16 jtc Exp $ .\" .\" Copyright (c) 1983, 1991 The Regents of the University of California. .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)imp.4 6.5 (Berkeley) 3/28/91 .\" .Dd March 28, 1991 .Dt IMP 4 .Os BSD 4.2 .Sh NAME .Nm imp .Nd .Tn IMP raw socket interface .Sh SYNOPSIS .Fd #include <sys/socket.h> .Fd #include <netinet/in.h> .Fd #include <netimp/if_imp.h> .Ft int .Fn socket AF_IMPLINK SOCK_RAW proto .Sh DESCRIPTION The raw imp socket provides direct access to the .Nm imp network interface. Users send packets through the interface using the .Xr send 2 calls, and receive packets with the .Xr recv 2 , calls. All outgoing packets must have an 1822 96-bit leader on the front. Likewise, packets received by the user will have this leader on the front. The 1822 leader and the legal values for the various fields are defined in the include file .Aq Pa netimp/if_imp.h . The raw imp interface automatically installs the length and destination address in the 1822 leader of all outgoing packets; these need not be filled in by the user. .Pp If the protocol selected, .Fa proto , is zero, the socket will receive all .Tn IMP messages except RFNM and incompletes which are not input data for a kernel protocol. If .Fa proto is non-zero, only messages for the specified link type will be received. .Sh DIAGNOSTICS An operation on a socket may fail with one of the following errors: .Bl -tag -width [EADDRNOTAVAIL] .It Bq Er EISCONN when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the destination address specified and the socket is already connected; .It Bq Er ENOTCONN when trying to send a datagram, but no destination address is specified, and the socket hasn't been connected; .It Bq Er ENOBUFS when the system runs out of memory for an internal data structure; .It Bq Er ENOBUFS eight messages to the destination host are outstanding, and another eight are already queued for output; .It Bq Er EADDRNOTAVAIL when an attempt is made to create a socket with a network address for which no network interface exists. .El .Sh SEE ALSO .Xr intro 4 , .Xr inet 4 , .Xr imp 4 .Sh HISTORY The .Nm driver appeared in .Bx 4.2 .