SOCKETPAIR(2)             NetBSD System Calls Manual             SOCKETPAIR(2)

NAME
     socketpair -- create a pair of connected sockets

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/socket.h>

     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.

     [ENFILE]           The system file table is full.

     [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.

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

HISTORY
     The socketpair() function call appeared in 4.2BSD.

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.

NetBSD 5.1                      August 18, 2002                     NetBSD 5.1

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