os_pipe
err = os_pipe(fds, 1, 1);
err = os_pipe(in_fds, 1, 0);
err = os_pipe(out_fds, 1, 0);
err = os_pipe(socket, 0, 0);
err = os_pipe(uml_rtc_irq_fds, 1, 1);
err = os_pipe(fds, 1, 1);
rc = os_pipe(req_fds, true, true);
rc = os_pipe(call_fds, true, true);
extern int os_pipe(int *fd, int stream, int close_on_exec);
EXPORT_SYMBOL(os_pipe);