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.\" 30.Dd June 4, 1993 31.Dt GETPEERNAME 2 32.Os 33.Sh NAME 34.Nm getpeername 35.Nd get name of connected peer 36.Sh LIBRARY 37.Lb libc 38.Sh SYNOPSIS 39.In sys/types.h 40.In sys/socket.h 41.Ft int 42.Fn getpeername "int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen" 43.Sh DESCRIPTION 44The 45.Fn getpeername 46system call 47returns the name of the peer connected to 48socket 49.Fa s . 50The 51.Fa namelen 52argument 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 EINVAL 70The value of the 71.Fa namelen 72argument is not valid. 73.It Bq Er ENOTSOCK 74The argument 75.Fa s 76is a file, not a socket. 77.It Bq Er ENOTCONN 78The socket is not connected. 79.It Bq Er ENOBUFS 80Insufficient resources were available in the system 81to perform the operation. 82.It Bq Er EFAULT 83The 84.Fa name 85argument points to memory not in a valid part of the 86process address space. 87.El 88.Sh SEE ALSO 89.Xr accept 2 , 90.Xr bind 2 , 91.Xr getsockname 2 , 92.Xr socket 2 93.Sh HISTORY 94The 95.Fn getpeername 96system call appeared in 97.Bx 4.2 . 98