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+.\"	$NetBSD: getpeername.2,v 1.21 2011/06/03 08:07:48 wiz Exp $
+.\"
+.\" Copyright (c) 1983, 1991, 1993
+.\"	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. 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.
+.\"
+.\"     @(#)getpeername.2	8.1 (Berkeley) 6/4/93
+.\"
+.Dd June 3, 2011
+.Dt GETPEERNAME 2
+.Os
+.Sh NAME
+.Nm getpeername
+.Nd get name of connected peer
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/socket.h
+.Ft int
+.Fn getpeername \
+"int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen"
+.Sh DESCRIPTION
+The
+.Fn getpeername
+function returns the name of the peer connected to the socket
+.Fa s .
+One common use occurs when a process inherits an open socket, such as
+TCP servers forked from
+.Xr inetd 8 .
+In this scenario,
+.Fn getpeername
+is used to determine the connecting client's IP address.
+.Pp
+The function takes three parameters:
+.Bl -tag -width namelen -offset indent
+.It Fa s
+contains the file descriptor of the socket whose peer should be looked up.
+.It Fa name
+points to a
+.Li sockaddr
+structure that will hold the address information for the connected peer.
+Normal use requires one to use a structure
+specific to the protocol family in use, such as
+.Li sockaddr_in
+(IPv4) or
+.Li sockaddr_in6
+(IPv6), cast to a (struct sockaddr *).
+.Pp
+For greater portability, especially with the newer protocol families, the new
+.Li struct sockaddr_storage
+should be used.
+.Li sockaddr_storage
+is large enough to hold any of the other sockaddr_* variants.
+On return, it can be cast to the correct sockaddr type,
+based on the protocol family contained in its ss_family field.
+.It Fa namelen
+indicates the amount of space pointed to by
+.Fa name ,
+in bytes.
+.El
+.Pp
+If address information for the local end of the socket is required, the
+.Xr getsockname 2
+function should be used instead.
+.Pp
+If
+.Fa name
+does not point to enough space to hold the entire socket address, the
+result will be truncated to
+.Fa namelen
+bytes.
+.Sh RETURN VALUES
+If the call succeeds, a 0 is returned and
+.Fa namelen
+is set to the actual size of the socket address returned in
+.Fa name .
+Otherwise,
+.Va errno
+is set and a value of \-1 is returned.
+.Sh ERRORS
+The call succeeds unless:
+.Bl -tag -width Er
+.It Bq Er EBADF
+The argument
+.Fa s
+is not a valid descriptor.
+.It Bq Er EFAULT
+The
+.Fa name
+parameter points to memory not in a valid part of the
+process address space.
+.It Bq Er ENOBUFS
+Insufficient resources were available in the system
+to perform the operation.
+.It Bq Er ENOTCONN
+The socket is not connected.
+.It Bq Er ENOTSOCK
+The argument
+.Fa s
+is a file, not a socket.
+.El
+.Sh SEE ALSO
+.Xr accept 2 ,
+.Xr bind 2 ,
+.Xr getsockname 2 ,
+.Xr socket 2
+.Sh STANDARDS
+The function conforms to
+.St -p1003.1-2008 .
+.Sh HISTORY
+The
+.Fn getpeername
+function call appeared in
+.Bx 4.2 .