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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 appropri-
       ately.

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 System 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 3.22 of the Linux man-pages project.  A description of
       the project, and information about reporting bugs, can be found at  http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-10-11                     SOCKETPAIR(2)

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