1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)getpeername.2 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD: src/lib/libc/sys/getpeername.2,v 1.9.2.8 2001/12/14 18:34:00 ru Exp $ 30.\" $DragonFly: src/lib/libc/sys/getpeername.2,v 1.2 2003/06/17 04:26:47 dillon Exp $ 31.\" 32.Dd June 4, 1993 33.Dt GETPEERNAME 2 34.Os 35.Sh NAME 36.Nm getpeername 37.Nd get name of connected peer 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In sys/types.h 42.In sys/socket.h 43.Ft int 44.Fn getpeername "int s" "struct sockaddr *name" "socklen_t *namelen" 45.Sh DESCRIPTION 46.Fn Getpeername 47returns the name of the peer connected to 48socket 49.Fa s . 50The 51.Fa namelen 52parameter should be initialized to indicate 53the amount of space pointed to by 54.Fa name . 55On return it contains the actual size of the name 56returned (in bytes). 57The name is truncated if the buffer provided is too small. 58.Sh RETURN VALUES 59.Rv -std getpeername 60.Sh ERRORS 61The call succeeds unless: 62.Bl -tag -width Er 63.It Bq Er EBADF 64The argument 65.Fa s 66is not a valid descriptor. 67.It Bq Er ECONNRESET 68The connection has been reset by the peer. 69.It Bq Er ENOTSOCK 70The argument 71.Fa s 72is a file, not a socket. 73.It Bq Er ENOTCONN 74The socket is not connected. 75.It Bq Er ENOBUFS 76Insufficient resources were available in the system 77to perform the operation. 78.It Bq Er EFAULT 79The 80.Fa name 81parameter points to memory not in a valid part of the 82process address space. 83.El 84.Sh SEE ALSO 85.Xr accept 2 , 86.Xr bind 2 , 87.Xr getsockname 2 , 88.Xr socket 2 89.Sh HISTORY 90The 91.Fn getpeername 92function call appeared in 93.Bx 4.2 . 94