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>SOCKETPAIR(2)                 System Calls Manual                SOCKETPAIR(2)
 
NAME
     socketpair - create a pair of connected sockets
 
SYNOPSIS
     #include &lt;sys/types.h&#62;
     #include &lt;sys/socket.h&#62;
 
     int
     socketpair(int d, int type, int protocol, int *sv);
 
DESCRIPTION
     The socketpair() call creates an unnamed pair of connected sockets in the
     specified domain d, of the specified type, and using the optionally spec-
     ified protocol.  The descriptors used in referencing the new sockets are
     returned in sv[0] and sv[1].  The two sockets are indistinguishable.
 
RETURN VALUES
     A 0 is returned if the call succeeds, -1 if it fails.
 
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.
 
     [EOPNOTSUPP]       The specified protocol does not support creation of
                        socket pairs.
 
     [EFAULT]           The address sv does not specify a valid part of the
                        process address space.
 
     [ENFILE]           The system file table is full.
 
SEE ALSO
     pipe(2), read(2), write(2)
 
BUGS
     This call is currently implemented only for the LOCAL domain.  Many oper-
     ating systems only accept a protocol of PF_UNSPEC, so that should be used
     instead of PF_LOCAL for maximal portability.
 
STANDARDS
     The socketpair() function conforms to X/Open Portability Guide Issue 4.2
     (``XPG4.2'').
 
HISTORY
     The socketpair() function call appeared in 4.2BSD.
 
BSD                              June 4, 1993                              BSD
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