sunos man page for socketpair

socketpair(3SOCKET)					     Sockets Library Functions					       socketpair(3SOCKET)

NAME
       socketpair - create a pair of connected sockets

SYNOPSIS
       cc [ flag ... ] file ... -lsocket -lnsl [ library ... ]
       #include <sys/types.h>
       #include <sys/socket.h>

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

DESCRIPTION
       The  socketpair()  library call creates an unnamed pair of connected sockets in the specified address family domain, of the specified type,
       that uses the optionally specified protocol. The descriptors that are used in referencing the new sockets are returned in sv[0] and  sv[1].
       The two sockets are indistinguishable.

RETURN VALUES
       socketpair() returns -1 on failure and 0 on success.

ERRORS
       The call succeeds unless:

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

       EMFILE			       Too many descriptors are in use by this process.

       ENOMEM			       There was insufficient user memory for the operation to complete.

       ENOSR			       There were insufficient STREAMS resources for the operation to complete.

       EOPNOTSUPP		       The specified protocol does not support creation of socket pairs.

       EPROTONOSUPPORT		       The specified protocol is not supported on this machine.

       EACCES			       The process does not have appropriate privileges.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       pipe(2), read(2), write(2), socket.h(3HEAD), attributes(5)

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

SunOS 5.10							    10 Jan 2001 					       socketpair(3SOCKET)