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