4.1cBSD/usr/man/man2/socketpair.2

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.TH SOCKETPAIR 2 2/13/83
.SH NAME
socketpair \- create a pair of connected sockets
.SH SYNOPSIS
.nf
.ft B
#include <sys/socket.h>
.PP
.ft B
socketpair(d, type, protocol, sv)
int d, type, protocol;
int sv[2];
.fi
.SH DESCRIPTION
.ft B
This 4.2 call is not implemented in 4.1c.
.ft R
.PP
The
.I socketpair
system call
creates an unnamed pair of connected sockets in
the specified address family,
of the specified
.I type
and using the optionally specified
.IR protocol .
.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)