On Thu, 20 Mar 2003, Takashi Iwai wrote:
> At Thu, 20 Mar 2003 10:02:06 +0100,
> Kristof Pelckmans wrote:
> >
> > I wonder how you know that the number you assign is not in use...
>
> well, there is no guarantee for that.
>
> i think it would be more understandable to have the string type ipc
> key, such as
>
> pcm.dmix {
> type dmix
> ipc_key_str /usr/alsa/foo
> ...
> }
>
> which generates an ipc key via ftok().
That's a question. This is a quote from the ftok() man page:
"Of course no guarantee can be given that the resulting key_t is unique."
I think that the best solution is to create a communication file with
information about used unique IPC key and add a verification that used
IPC semaphores and IPC areas are ours.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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