Re: Trying to.... It's amazing and it works!

[Manu Valderrama]

Manuel Menal wrote:

> > Thanks for your answer, it has been somewhat useful ;-) , but not completly, 
> :-(
>
> Heh, I'm not gonna do _your_ exercise, I've already done it a few times ;P
Of course not, but in some sense almost ! The good clues help very much 
( or must I say mach ) :-)

> Yup, that's the main problem, but I'm not sure I should help you for
> this. It is all in the guides. :-)
>
> [snip]
Yes, is all in the guides; but they are a bit difficult to read 
sometimes, especially when
there are no examples! ( also if you are somewhat impatient; learning is 
gradual )

> > and, as you have pointed, I get a "MACH_SEND_INVALID_HEADER" error code!
> > I have tried some few things to fill this msgh_bits field correctly, but I'm
> > afraid
> > that I'm still not prepared; some help will be apreciated, but maybe it would 
> be
> > more interesting that me by-myself try todiscover how to fill correctly this
> > field.
>
> Yup, I think so. Don't forget, though, that you only have a receive
> right right now, and that you need to make a send right in order to send
> a message; there are several ways to do it, as you can see in the
> manuals: via mach_msg and MACH_MSG_TYPE_MAKE_SEND, or via
> mach_port_insert_right (that one is in Kernel Interfaces too). 
>
>
>  
Just the little help I was needing ; although I must admit that I have had
very much good luck. This was finally the keys to solve the problem :

(1) allocate the port :

mach_port_allocate( mach_task_self(), MACH_PORT_RIGHT_RECEIVE, 
&receive_port );

(2) insert a send right in the port :

mach_port_insert_right( mach_task_self(), receive_port, 
MACH_PORT_RIGHT_SEND,
MACH_PORT_NULL );
(3) fill the correct msgh_bits :

my_message.head.msgh_bits = MACH_MSGH_BITS( MACH_MSG_TYPE_MAKE_SEND );

but the happyness is not complete; as you ( or anybody that knows enough 
about mach ) would
appreciate, I filled all the "mach_msg_type_name_t" variables with 
random values until the code
worked ( -> MACH_MSG_TYPE_MAKE_SEND; I think it does not make very much 
sense
in the msgh_bits field !! ).

Now that I have satisfied my impatience, and some of my curiosity, it's 
time to think about the last
issue.

Anycase, very much help you for your so much useful help :-).
"May God pay you it with many <soons>!" ( a traduction of a spanish
expression; I suspect that does not sound very good in english.
Feel free of change the <soons> field by whatever you want... )

> You're welcome!
>
> Bye,
>
>  
Thank you again; and bye too!!