You can't open handlers in append mode. You must supply O_TRUNC when opening
a handler file for writing.
If you really really really need this functionality, I suppose it could be
done for read/write handlers by making append mode equal a read followed by
writes. But this is not the usual semantics of append mode. Better to make
your program work without it.
Eddie
Giovanni Di Stasi wrote:
> I'm writing a program which runs in user context and opens and writes into a
> handler file exported by click in kernel mode.
>
> I'm having problems in opening that file:
>
> int fd_links;
> fd_links=open("/click/element/handler", O_WRONLY | O_APPEND);
>
> The open call returns -1, and the error is "Permission denied".
>
> The program runs with root privileges (at least I think so, it is a olsrd
> plugin).
>
> Do you have any hints? I tried other flags, but I always get that error.
>
>
>
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