SOCKETPAIR

socketpair ? create a pair of connected sockets

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

int socketpair(int d, int type, int protocol, int sv[2]);

The call creates an unnamed pair of connected sockets in the specified domain d, of the specified type, and using the optionally specified protocol. The descriptors used in referencing the new sockets are returned in sv[0] and sv[1]. The two sockets are indistinguishable.

On success, zero is returned. On error, ?1 is returned, and errno is set appropriately.

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.

4.4BSD (the socketpair function call appeared in 4.2BSD). Generally portable to/from non-BSD systems supporting clones of the BSD socket layer (including System V variants).

read(2), write(2), pipe(2)