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-.\" Copyright (c) 1983, 1991 The Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\"     @(#)socketpair.2	6.4 (Berkeley) 3/10/91
-.\"
-.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
-.\" Modified 1996-10-22 by Eric S. Raymond <esr@thyrsus.com>
-.\" Modified 2002-07-22 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\" Modified 2004-06-17 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\" 2008-10-11, mtk: Add description of SOCK_NONBLOCK and SOCK_CLOEXEC
-.\"
-.TH socketpair 2 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-socketpair \- create a pair of connected sockets
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <sys/socket.h>
-.P
-.BI "int socketpair(int " domain ", int " type ", int " protocol \
-", int " sv [2]);
-.fi
-.SH DESCRIPTION
-The
-.BR socketpair ()
-call creates an unnamed pair of connected sockets in the specified
-.IR domain ,
-of the specified
-.IR type ,
-and using the optionally specified
-.IR protocol .
-For further details of these arguments, see
-.BR socket (2).
-.P
-The file descriptors used in referencing the new sockets are returned in
-.I sv[0]
-and
-.IR sv[1] .
-The two sockets are indistinguishable.
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned,
-.I errno
-is set to indicate the error, and
-.I sv
-is left unchanged
-.P
-On Linux (and other systems),
-.BR socketpair ()
-does not modify
-.I sv
-on failure.
-A requirement standardizing this behavior was added in POSIX.1-2008 TC2.
-.\" http://austingroupbugs.net/view.php?id=483
-.SH ERRORS
-.TP
-.B EAFNOSUPPORT
-The specified address family is not supported on this machine.
-.TP
-.B EFAULT
-The address
-.I sv
-does not specify a valid part of the process address space.
-.TP
-.B EMFILE
-The per-process limit on the number of open file descriptors has been reached.
-.TP
-.B ENFILE
-The system-wide limit on the total number of open files has been reached.
-.TP
-.B EOPNOTSUPP
-The specified protocol does not support creation of socket pairs.
-.TP
-.B EPROTONOSUPPORT
-The specified protocol is not supported on this machine.
-.SH VERSIONS
-On Linux, the only supported domains for this call are
-.B AF_UNIX
-(or synonymously,
-.BR AF_LOCAL )
-and
-.B AF_TIPC
-.\" commit: 70b03759e9ecfae400605fa34f3d7154cccbbba3
-(since Linux 4.12).
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, 4.4BSD.
-.P
-.BR socketpair ()
-first appeared in 4.2BSD.
-It is generally portable to/from
-non-BSD systems supporting clones of the BSD socket layer (including
-System\ V variants).
-.P
-Since Linux 2.6.27,
-.BR socketpair ()
-supports the
-.B SOCK_NONBLOCK
-and
-.B SOCK_CLOEXEC
-flags in the
-.I type
-argument, as described in
-.BR socket (2).
-.SH SEE ALSO
-.BR pipe (2),
-.BR read (2),
-.BR socket (2),
-.BR write (2),
-.BR socket (7),
-.BR unix (7)