freebsd-dev/lib/libc/sys/getpeername.2

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.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\" This product includes software developed by the University of
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.\" @(#)getpeername.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
.Dd June 4, 1993
.Dt GETPEERNAME 2
.Os
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.Sh NAME
.Nm getpeername
.Nd get name of connected peer
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In sys/types.h
.In sys/socket.h
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.Ft int
.Fn getpeername "int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen"
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.Sh DESCRIPTION
The
.Fn getpeername
system call
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returns the name of the peer connected to
socket
.Fa s .
The
.Fa namelen
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argument should be initialized to indicate
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the amount of space pointed to by
.Fa name .
On return it contains the actual size of the name
returned (in bytes).
The name is truncated if the buffer provided is too small.
.Sh RETURN VALUES
.Rv -std getpeername
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.Sh ERRORS
The call succeeds unless:
.Bl -tag -width Er
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.It Bq Er EBADF
The argument
.Fa s
is not a valid descriptor.
.It Bq Er ECONNRESET
The connection has been reset by the peer.
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.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
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The
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.Fa name
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argument points to memory not in a valid part of the
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process address space.
.El
.Sh SEE ALSO
.Xr accept 2 ,
.Xr bind 2 ,
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.Xr getsockname 2 ,
.Xr socket 2
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.Sh HISTORY
The
.Fn getpeername
system call appeared in
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.Bx 4.2 .