'\" te
.\" Copyright 1989 AT&T
.\" Copyright (C) 2002, Sun Microsystems, Inc. All Rights Reserved
.TH socketpair 3SOCKET "10 Jan 2001" "SunOS 5.11" "Sockets Library Functions"
.SH NAME
socketpair \- create a pair of connected sockets
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lsocket\fR \fB -lnsl \fR [ \fIlibrary\fR ... ]
#include <sys/types.h>
#include <sys/socket.h>

\fBint\fR \fBsocketpair\fR(\fBint\fR \fIdomain\fR, \fBint\fR \fItype\fR, \fBint\fR \fIprotocol\fR, \fBint\fR \fIsv\fR[2]);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBsocketpair()\fR library call creates an unnamed pair of connected sockets in the specified address family \fIdomain\fR, of the specified \fItype\fR, that uses the optionally specified \fIprotocol\fR. The descriptors that are used in referencing the new sockets are returned in \fIsv\fR[0] and \fIsv\fR[1]. The two sockets are indistinguishable.
.SH RETURN VALUES
.sp
.LP
\fBsocketpair()\fR returns \fB\(mi1\fR on failure and \fB0\fR on success.
.SH ERRORS
.sp
.LP
The call succeeds unless:
.sp
.ne 2
.mk
.na
\fB\fBEAFNOSUPPORT\fR\fR
.ad
.RS 19n
.rt  
The specified address family is not supported on this machine.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEMFILE\fR\fR
.ad
.RS 19n
.rt  
Too many descriptors are in use by this process.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 19n
.rt  
There was insufficient user memory for the operation to complete.
.RE

.sp
.ne 2
.mk
.na
\fB\fBENOSR\fR\fR
.ad
.RS 19n
.rt  
There were insufficient \fBSTREAMS\fR resources for the operation to complete.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEOPNOTSUPP\fR\fR
.ad
.RS 19n
.rt  
The specified protocol does not support creation of socket pairs.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEPROTONOSUPPORT\fR\fR
.ad
.RS 19n
.rt  
The specified protocol is not supported on this machine.
.RE

.sp
.ne 2
.mk
.na
\fB\fBEACCES\fR\fR
.ad
.RS 19n
.rt  
The process does not have appropriate privileges.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
tab() box;
cw(2.75i) |cw(2.75i) 
lw(2.75i) |lw(2.75i) 
.
ATTRIBUTE TYPEATTRIBUTE VALUE
_
MT-LevelSafe
.TE

.SH SEE ALSO
.sp
.LP
\fBpipe\fR(2), \fBread\fR(2), \fBwrite\fR(2), \fBsocket.h\fR(3HEAD), \fBattributes\fR(5)
.SH NOTES
.sp
.LP
This call is currently implemented only for the \fBAF_UNIX\fR address family.