socketpair(2)                                       socketpair(2)



NAME
     socketpair - creates a pair of connected sockets

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

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

DESCRIPTION
     socketpair() creates an unnamed pair of connected sockets
     in  the  specified address family 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.

STATUS MESSAGES AND VALUES
     The socketpair() system call returns zero if successful. If
     unsuccessful, it returns -1 and sets the value of errno to
     indicate a particular error as described here:

     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.

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

     EPROTONOSUPPORT
          The specified protocol is not supported on this
          machine.

LIMITATIONS
     This call is currently implemented only for the AF_UNIX
     address family.

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






January 1992                                                    1