socketpair - create a pair of connected sockets
int socketpair(int d, int type, int protocol, int sv);
The socketpair library call creates an unnamed pair of connected sockets
in the specified address family d, of the specified type, and using the
optionally specified protocol. The descriptors used in referencing the
new sockets are returned in sv and sv. The two sockets are
socketpair returns a -1 on failure, otherwise it returns the number of
the second file descriptor it creates.
The call succeeds unless:
EMFILE Too many descriptors are in use by this process.
EAFNOSUPPORT The specified address family is not supported on this
EPROTONOSUPPORT The specified protocol is not supported on this
EOPNOSUPPORT The specified protocol does not support creation of
ENOMEM There was insufficient user memory for the operation
ENOSR There were insufficient STREAMS resources for the
operation to complete.
pipe(2), read(2), write(2)
This call is currently implemented only for the AF_UNIX address family.
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