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-.\" 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.
-.\"
-.\"     @(#)socketpair.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd February 10, 2018
-.Dt SOCKETPAIR 2
-.Os
-.Sh NAME
-.Nm socketpair
-.Nd create a pair of connected sockets
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In sys/socket.h
-.Ft int
-.Fn socketpair "int domain" "int type" "int protocol" "int *sv"
-.Sh DESCRIPTION
-The
-.Fn socketpair
-system call creates an unnamed pair of connected sockets in
-the specified communications
-.Fa domain ,
-of the specified
-.Fa type ,
-and using the optionally specified
-.Fa protocol .
-The descriptors used in referencing the new sockets
-are returned in
-.Fa sv Ns [0]
-and
-.Fa sv Ns [1] .
-The two sockets are indistinguishable.
-.Pp
-The
-.Dv SOCK_CLOEXEC
-and
-.Dv SOCK_NONBLOCK
-flags in the
-.Fa type
-argument apply to both descriptors.
-.Sh RETURN VALUES
-.Rv -std socketpair
-.Sh ERRORS
-The call succeeds unless:
-.Bl -tag -width Er
-.It Bq Er EMFILE
-Too many descriptors are in use by this process.
-.It Bq Er EAFNOSUPPORT
-The specified address family is not supported on this machine.
-.It Bq Er EPROTONOSUPPORT
-The specified protocol is not supported on this machine.
-.It Bq Er EOPNOTSUPP
-The specified protocol does not support creation of socket pairs.
-.It Bq Er EFAULT
-The address
-.Fa sv
-does not specify a valid part of the
-process address space.
-.El
-.Sh SEE ALSO
-.Xr pipe 2 ,
-.Xr read 2 ,
-.Xr socket 2 ,
-.Xr write 2
-.Sh STANDARDS
-The
-.Fn socketpair
-system call conforms to
-.St -p1003.1-2001
-and
-.St -p1003.1-2008 .
-.Sh HISTORY
-The
-.Fn socketpair
-system call appeared in
-.Bx 4.2 .
-.Sh BUGS
-This call is currently implemented only for the
-.Ux
-domain.