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Linux 2.6 - man page for socketpair (linux section 2)

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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 address 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 Sys-
       tem V variants).

NOTES
       On Linux, the only supported domain for this call is AF_UNIX (or synonymously,  AF_LOCAL).
       (Most implementations have the same restriction.)

       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 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at
       http://www.kernel.org/doc/man-pages/.

Linux					    2008-10-11				    SOCKETPAIR(2)
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