socketpair man page on 4.4BSD

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SOCKETPAIR(2)		    BSD System Calls Manual		 SOCKETPAIR(2)

NAME
     socketpair — create a pair of connected sockets

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

DIAGNOSTICS
     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.

     [EOPNOSUPPORT]    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
     read(2), write(2), pipe(2)

BUGS
     This call is currently implemented only for the UNIX domain.

HISTORY
     The socketpair function call appeared in 4.2BSD.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution
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