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)

BUGS

     This call is currently implemented only for the UNIX domain.

HISTORY

     The socketpair() system call appeared in 4.2BSD.