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SOCKETPAIR(2)		    BSD System Calls Manual		 SOCKETPAIR(2)

NAME
     socketpair — create a pair of connected sockets

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/socket.h>

     int
     socketpair(int d, int type, int protocol, int *sv);

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

     The type and protocol argument values are described in socket(2).

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

ERRORS
     The call succeeds unless:

     [EAFNOSUPPORT]	The specified address family is not supported on this
			machine.

     [EFAULT]		The address sv does not specify a valid part of the
			process address space.

     [EMFILE]		Too many descriptors are in use by this process.

     [ENFILE]		The system file table is full.

     [EOPNOTSUPP]	The specified protocol does not support creation of
			socket pairs.

     [EPROTONOSUPPORT]	The specified protocol is not supported on this
			machine.

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

HISTORY
     The socketpair() function call appeared in 4.2BSD.

BUGS
     This call is currently implemented only for the PF_LOCAL domain.

BSD				 June 24, 2011				   BSD

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