4.3BSD-Reno/src/lib/libc/sys/socketpair.2

.\" Copyright (c) 1983 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted provided
.\" that: (1) source distributions retain this entire copyright notice and
.\" comment, and (2) distributions including binaries display the following
.\" acknowledgement:  ``This product includes software developed by the
.\" University of California, Berkeley and its contributors'' in the
.\" documentation or other materials provided with the distribution and in
.\" all advertising materials mentioning features or use of this software.
.\" 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"	@(#)socketpair.2	6.3 (Berkeley) 6/23/90
.\"
.TH SOCKETPAIR 2 "June 23, 1990"
.UC 5
.SH NAME
socketpair \- create a pair of connected sockets
.SH SYNOPSIS
.nf
.ft B
#include <sys/types.h>
#include <sys/socket.h>
.PP
.ft B
socketpair(d, type, protocol, sv)
int d, type, protocol;
int sv[2];
.fi
.SH DESCRIPTION
The
.I socketpair
call creates an unnamed pair of connected sockets in
the specified domain
.IR d ,
of the specified
.IR type ,
and using the optionally specified
.IR protocol .
The descriptors used in referencing the new sockets
are returned in
.IR sv [0]
and
.IR sv [1].
The two sockets are indistinguishable.
.SH DIAGNOSTICS
A 0 is returned if the call succeeds, \-1 if it fails.
.SH ERRORS
The call succeeds unless:
.TP 20
[EMFILE]
Too many descriptors are in use by this process.
.TP 20
[EAFNOSUPPORT]
The specified address family is not supported on this machine.
.TP 20
[EPROTONOSUPPORT]
The specified protocol is not supported on this machine.
.TP 20
[EOPNOSUPPORT]
The specified protocol does not support creation of socket pairs.
.TP 20
[EFAULT]
The address \fIsv\fP does not specify a valid part of the
process address space.
.SH "SEE ALSO"
read(2), write(2), pipe(2)
.SH BUGS
This call is currently implemented only for the UNIX domain.