Hi!
> It doesn't seem reliable:
>
> open("/dev/null", O_WRONLY|O_CREAT, 0644) = 3
> write(3, NULL, 1) = 1
> close(3) = 0
>
> I'm seeing this on RHEL6.7 kernel, I haven't tried latest upstream yet.
Ah, you are right, the memory is not touched in the write_null()
function at all.
drivers/char/mem.c:
static ssize_t write_null(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
return count;
}
--
Cyril Hrubis
chru...@suse.cz
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