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.\"     @(#)socketpair.2        8.1 (Berkeley) 6/4/93

.\"

.Dd June 4, 1993

.Dt SOCKETPAIR 2

.Os

.Sh NAME

.Nm socketpair

.Nd create a pair of connected sockets

.Sh SYNOPSIS

.Fd #include 

.Fd #include 

.Ft int

.Fn socketpair "int d" "int type" "int protocol" "int *sv"

.Sh DESCRIPTION

The

.Fn socketpair

call creates an unnamed pair of connected sockets in

the specified domain

.Fa d ,

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.

.Sh RETURN VALUES

A 0 is returned if the call succeeds, \-1 if it fails.

.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.

.It Bq Er ENFILE

The system file table is full.

.El

.Sh SEE ALSO

.Xr pipe 2 ,

.Xr read 2 ,

.Xr write 2

.Sh BUGS

This call is currently implemented only for the

.Tn LOCAL

domain.

Many operating systems only accept a

.Ar protocol

of

.Ev PF_UNSPEC ,

so that should be used instead of

.Ev PF_LOCAL

for maximal portability.

.Sh STANDARDS

The

.Fn socketpair

function conforms to

.St -xpg4.2 .

.Sh HISTORY

The

.Fn socketpair

function call appeared in

.Bx 4.2 .