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SOCKETPAIR(2) System Calls Manual SOCKETPAIR(2)

socketpair
create a pair of connected sockets

#include <sys/socket.h>
int
socketpair(int d, int type, int protocol, int sv[2]);

The socketpair() call creates an unnamed pair of connected sockets in the specified domain d, of the specified type, and using the optionally specified protocol. The descriptors used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable.

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

The call succeeds unless:
 
 
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The specified address family is not supported on this machine.
 
 
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The specified protocol is not supported on this machine.
 
 
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The specified protocol does not support creation of socket pairs.
 
 
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The combination of the specified protocol and type is not supported.
 
 
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The per-process descriptor table is full.
 
 
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The system file table is full.
 
 
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Insufficient resources were available in the system to perform the operation.
 
 
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The address sv does not specify a valid part of the process address space.

pipe(2), read(2), socket(2), write(2)

The socketpair() function conforms to IEEE Std 1003.1-2008 (“POSIX.1”).

The socketpair() function call appeared in 4.2BSD.

This call is currently implemented only for the LOCAL domain. Many operating systems only accept a protocol of PF_UNSPEC, so that should be used instead of PF_LOCAL for maximal portability.
April 8, 2013 OpenBSD-5.6