On Jan 19, 2006, at 3:49 AM, Alan Cox wrote:
> On Iau, 2006-01-19 at 00:58 -0600, Kumar Gala wrote:
>> Since we can only open the watchdog once having a spinlock to protect
>> multiple access is pointless.
>>
>> Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
>
> NAK
>
> This is a common mistake.
>
> open is called on the open() call and is indeed in this case 'single
> open', but file handles can be inherited and many users may have
> access
> to a single file handle.
>
> eg
>
> f = open("/dev/watchdog", O_RDWR);
> fork();
> while(1) {
> write(f, "Boing", 5);
> }
>
> Alan
Thanks, you learn something new every day.
- kumar
