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SOCKETPAIR(2)		   Linux Programmer's Manual		 SOCKETPAIR(2)

NAME
       socketpair - create a pair of connected sockets

SYNOPSIS
       #include	<sys/types.h>	       /* See NOTES */
       #include	<sys/socket.h>

       int socketpair(int domain, int type, int	protocol, int sv[2]);

DESCRIPTION
       The  socketpair()  call creates an unnamed pair of connected sockets in
       the specified domain, of	the specified type, and	using  the  optionally
       specified  protocol.   For  further  details  of	 these	arguments, see
       socket(2).

       The descriptors used in referencing the new  sockets  are  returned  in
       sv[0] and sv[1].	 The two sockets are indistinguishable.

RETURN VALUE
       On  success,  zero is returned.	On error, -1 is	returned, and errno is
       set appropriately.

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

       EFAULT The address sv does not specify a	valid part of the process  ad-
	      dress space.

       EMFILE Too many descriptors are in use by this process.

       ENFILE The  system  limit  on  the  total number	of open	files has been
	      reached.

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

       EPROTONOSUPPORT
	      The specified protocol is	not supported on this machine.

CONFORMING TO
       4.4BSD,	POSIX.1-2001.	The  socketpair()  function  call  appeared in
       4.2BSD.	It is generally	portable to/from  non-BSD  systems  supporting
       clones of the BSD socket	layer (including System	V variants).

NOTES
       On  Linux,  the only supported domain for this call is AF_UNIX (or syn-
       onymously, AF_LOCAL).  (Most implementations  have  the	same  restric-
       tion.)

       Since   Linux  2.6.27,  socketpair()  supports  the  SOCK_NONBLOCK  and
       SOCK_CLOEXEC flags described in socket(2).

       POSIX.1-2001 does not require the inclusion of _sys/types.h_, and  this
       header  file  is	not required on	Linux.	However, some historical (BSD)
       implementations required	this header file,  and	portable  applications
       are probably wise to include it.

SEE ALSO
       pipe(2),	read(2), socket(2), write(2), socket(7), unix(7)

COLOPHON
       This  page  is  part of release 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2008-10-11			 SOCKETPAIR(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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