socketpair man page on FreeBSD

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

NAME
     socketpair — create a pair of connected sockets

LIBRARY
     Standard C Library (libc, -lc)

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

     int
     socketpair(int d, int type, int protocol, int *sv);

DESCRIPTION
     The socketpair() system call creates an unnamed pair of connected sockets
     in the specified domain d, of the specified type, and using the option‐
     ally specified protocol.  The descriptors used in referencing the new
     sockets are returned in sv[0] and sv[1].  The two sockets are indistin‐
     guishable.

RETURN VALUES
     The socketpair() function returns the value 0 if successful; otherwise
     the value -1 is returned and the global variable errno is set to indicate
     the error.

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.

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

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

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

BSD				 June 4, 1993				   BSD
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