.\" $OpenBSD: getpeername.2,v 1.20 2003/06/02 20:18:39 millert Exp $ .\" $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. 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 July 17, 1999 .Dt GETPEERNAME 2 .Os .Sh NAME .Nm getpeername .Nd get name of connected peer .Sh SYNOPSIS .Fd #include <sys/types.h> .Fd #include <sys/socket.h> .Ft int .Fn getpeername "int s" "struct sockaddr *name" "socklen_t *namelen" .Sh DESCRIPTION .Fn getpeername returns the address information of the peer connected to 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 .Fn getpeername takes three parameters: .Pp .Fa s contains the file descriptor of the socket whose peer should be looked up. .Pp .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. .Pp .Fa namelen indicates the amount of space pointed to by .Fa name , in bytes. .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 On failure, .Va errno is set to one of the following: .Bl -tag -width Er .It Bq Er EBADF The argument .Fa s is not a valid descriptor. .It Bq Er ENOTSOCK The argument .Fa s is a file, not a socket. .It Bq Er ENOTCONN The socket is not connected. .It Bq Er ENOBUFS Insufficient resources were available in the system to perform the operation. .It Bq Er EFAULT The .Fa name parameter points to memory not in a valid part of the process address space. .El .Sh SEE ALSO .Xr accept 2 , .Xr bind 2 , .Xr getpeereid 2 , .Xr getsockname 2 , .Xr socket 2 .Sh HISTORY The .Fn getpeername function call appeared in .Bx 4.2 .