debian man page for io_socketpair

io_socketpair(3)					     Library Functions Manual						  io_socketpair(3)

NAME
       io_socketpair - create a pair of sockets

SYNTAX
       #include <io.h>

       int io_socketpair(int64 pfd[2]);

DESCRIPTION
       io_socketpair  creates a new UNIX socket pair and writes both descriptors to d.	The socket pair works much like a pipe, but it is bidirec-
       tional (i.e. both descriptors are for reading and writing).

       io_socketpair returns 1 to indicate success. If something goes wrong, io_socketpair returns 0, setting errno to indicate the error; in this
       case it frees any memory that it allocated for the new socketpair, and it leaves d alone.

SEE ALSO
       io_readfile(3), io_createfile(3), io_pipe(3)

																  io_socketpair(3)