.\" $NetBSD: getpeername.2,v 1.6 1995/10/12 15:40:56 jtc 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. 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. .\" .\" @(#)getpeername.2 8.1 (Berkeley) 6/4/93 .\" .Dd June 4, 1993 .Dt GETPEERNAME 2 .Os BSD 4.2 .Sh NAME .Nm getpeername .Nd get address of connected peer .Sh SYNOPSIS .Fd #include <sys/socket.h> .Ft int .Fo getpeername .Fa "int socket" .Fa "struct sockaddr *restrict address" .Fa "socklen_t *restrict address_len" .Fc .Sh DESCRIPTION The .Fn getpeername function returns the address of the peer connected to the specified socket. .Pp The .Fa address_len parameter should be initialized to indicate the amount of space pointed to by .Fa address . On return it contains the actual size of the address returned (in bytes). .Pp The address is truncated if the buffer provided is too small. .Sh RETURN VALUES .Rv -std getpeername .Sh ERRORS The call succeeds unless: .Bl -tag -width Er .\" ========== .It Bq Er EBADF The argument .Fa socket is not a valid descriptor. .\" ========== .It Bq Er EFAULT The .Fa address parameter points to memory not in a valid part of the process address space. .\" ========== .It Bq Er EINVAL .Fa socket has been shut down. .\" ========== .It Bq Er ENOBUFS Insufficient resources were available in the system to perform the operation. .\" ========== .It Bq Er ENOTCONN Either the socket is not connected or it has not had the peer pre-specified. .\" ========== .It Bq Er ENOTSOCK The argument .Fa socket refers to something other than a socket (e.g., a file). .\" ========== .It Bq Er EOPNOTSUPP .Fn getpeername is not supported for the protocol in use by .Fa socket . .El .Sh SEE ALSO .Xr accept 2 , .Xr bind 2 , .Xr getsockname 2 , .Xr socket 2 .Sh HISTORY The .Fn getpeername function call appeared in .Bx 4.2 .