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-.\"     $OpenBSD: getpeereid.3,v 1.4 2022/09/11 06:38:10 jmc 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.
-.Dd $Mdocdate: September 11 2022 $
-.Dt GETPEEREID 3
-.Os
-.Sh NAME
-.Nm getpeereid
-.Nd get effective user and group identification of locally-connected peer
-.Sh SYNOPSIS
-.In sys/types.h
-.In sys/socket.h
-.Ft int
-.Fn getpeereid "int s" "uid_t *euid" "gid_t *egid"
-.Sh DESCRIPTION
-.Fn getpeereid
-returns the effective user ID and group ID of the peer connected to
-a
-.Ux Ns -domain
-socket (see
-.Xr unix 4 ) .
-The argument
-.Fa s
-must be of type
-.Dv SOCK_STREAM
-or
-.Dv SOCK_SEQPACKET .
-.Pp
-One common use is for
-.Ux Ns -domain
-servers to determine the credentials of clients that have connected to it.
-.Pp
-.Fn getpeereid
-takes three parameters:
-.Bl -bullet
-.It
-.Fa s
-contains the file descriptor of the socket whose peer credentials
-should be looked up.
-.It
-.Fa euid
-points to a
-.Vt uid_t
-variable into which the effective user ID for the connected peer will
-be stored.
-.It
-.Fa egid
-points to a
-.Vt gid_t
-variable into which the effective group ID for the connected peer will
-be stored.
-.El
-.Sh RETURN VALUES
-If the call succeeds, a 0 is returned and
-.Fa euid
-and
-.Fa egid
-are set to the effective user ID and group ID of the connected peer.
-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 EOPNOTSUPP
-The socket is not in the
-.Ux Ns -domain .
-.It Bq Er ENOTCONN
-The socket is not connected.
-.It Bq Er ENOBUFS
-Insufficient resources were available in the system
-to perform the operation.
-.El
-.Sh SEE ALSO
-.Xr accept 2 ,
-.Xr bind 2 ,
-.Xr getpeername 2 ,
-.Xr getsockname 2 ,
-.Xr getsockopt 2 ,
-.Xr socket 2 ,
-.Xr unix 4
-.Sh HISTORY
-The
-.Fn getpeereid
-function call appeared in
-.Ox 3.0 .