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Re: [PATCH 04/11] doc: document mach_port_set_protected_payload


From: Neal H. Walfield
Subject: Re: [PATCH 04/11] doc: document mach_port_set_protected_payload
Date: Tue, 18 Feb 2014 13:40:43 +0100
User-agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.9 (Goj┼Ź) APEL/10.8 Emacs/23.2 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO)

At Mon, 17 Feb 2014 23:35:12 +0100,
Richard Braun wrote:
> 
> On Mon, Feb 17, 2014 at 06:20:54PM +0100, Justus Winter wrote:
> > +@deftypefun kern_return_t mach_port_set_protected_payload (@w{ipc_space_t 
> > @var{task}}, @w{mach_port_t @var{name}}, @w{unsigned long @var{payload}})
> > +The function @code{mach_port_set_protected_payload} sets the protected
> > +payload to @var{payload}.  If @var{payload} is non-zero, the
> > +@code{msgh_protected_payload} field will be set to @var{payload} if a
> > +message is delivered to @var{name}.
> 
> If I'm right, this also means switching back from the protected payload
> is done by calling this RPC with a payload of 0. It could be worth
> emphasizing that 0 is an invalid value for a protected payload.

These semantics are unfortunate.  0 should be valid.  Add another IPC
to clear the pp or add a parameter to this IPC called, say, set, which
if true sets the pp to the provided value and otherwise clears the pp.

Neal



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