SOCKETPAIR(2)                        BSD                         SOCKETPAIR(2)



NAME
     socketpair - create a pair of connected sockets

USAGE
     #include <sys/types.h>
     #include <sys/socket.h>

     socketpair(d, type, protocol, sv)
     int d, type, 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 sockets
     are returned in sv[0] and sv[1].  The two sockets are indistinguishable.

DIAGNOSTICS
     A successful call returns zero.  A failed call returns -1 and sets errno
     as indicated below.

ERRORS
     The call succeeds unless:

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

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

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

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

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