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.Dd June 4, 1993 29.Dt GETPEERNAME 2 30.Os 31.Sh NAME 32.Nm getpeername 33.Nd get name of connected peer 34.Sh LIBRARY 35.Lb libc 36.Sh SYNOPSIS 37.In sys/types.h 38.In sys/socket.h 39.Ft int 40.Fn getpeername "int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen" 41.Sh DESCRIPTION 42The 43.Fn getpeername 44system call 45returns the name of the peer connected to 46socket 47.Fa s . 48The 49.Fa namelen 50argument should be initialized to indicate 51the amount of space pointed to by 52.Fa name . 53On return it contains the actual size of the name 54returned (in bytes). 55The name is truncated if the buffer provided is too small. 56.Sh RETURN VALUES 57.Rv -std getpeername 58.Sh ERRORS 59The call succeeds unless: 60.Bl -tag -width Er 61.It Bq Er EBADF 62The argument 63.Fa s 64is not a valid descriptor. 65.It Bq Er ECONNRESET 66The connection has been reset by the peer. 67.It Bq Er EINVAL 68The value of the 69.Fa namelen 70argument is not valid. 71.It Bq Er ENOTSOCK 72The argument 73.Fa s 74is a file, not a socket. 75.It Bq Er ENOTCONN 76The socket is not connected. 77.It Bq Er ENOBUFS 78Insufficient resources were available in the system 79to perform the operation. 80.It Bq Er EFAULT 81The 82.Fa name 83argument points to memory not in a valid part of the 84process address space. 85.El 86.Sh SEE ALSO 87.Xr accept 2 , 88.Xr bind 2 , 89.Xr getsockname 2 , 90.Xr socket 2 91.Sh HISTORY 92The 93.Fn getpeername 94system call appeared in 95.Bx 4.2 . 96