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



NAME
       socketpair - create a pair of connected sockets

SYNOPSIS
       #include <&lt;sys/types.h>&gt;          /* See NOTES */
       #include <&lt;sys/socket.h>&gt;

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

DESCRIPTION
       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 sock-
       ets are returned in sv[0] and sv[1].  The  two  sockets  are  indistin-
       guishable.

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 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.)

       POSIX.1-2001  does not require the inclusion of &lt;sys/types.h&gt;, 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), unix(7)

COLOPHON
       This page is part of release 3.05 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                             2004-06-17                     SOCKETPAIR(2)