Hello,
My current goal is to make unionmount go away when the mountee (the
union-mounted translator) goes away. From antrik's words (and from
personal remembering) I know that this could be achieved by listening
to the MACH_NOTIFY_NO_SENDERS notification on translator's control
port. However, I could not find sufficient (for me) information how
to properly request such a notification.
I looked into hurd/boot/boot.c and libfshelp/start-translator-long.c
but, unfourtunately, both are handling rather specific cases,
considerably different from my situation. By analogy with boot.c, I
built up the following series of steps:
mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
&nosenders_listen_port);
mach_port_insert_right (mach_task_self (), nosenders_listen_port,
nosenders_listen_port, MACH_MSG_TYPE_MAKE_SEND);
mach_port_request_notification (mach_task_self (), nosenders_listen_port,
MACH_NOTIFY_NO_SENDERS, 1,
nosenders_listen_port,
MACH_MSG_TYPE_MAKE_SEND_ONCE, &prev);
However, this series of steps is pretty meaningless, since I never
specify the port to the mountee, to which I would like to listen for
notifications. I tried putting mountee_port and mountee_control (I
hope the names of the variables make their destination clear) instead
of nosenders_listen_port in different places, but I am constantly
receiving and ``invalid port right'' error.
Could somebody point out an idea of a solution to this problem,
please?
Regards,
scolobb
