This creates a mapping with twice the size of the allocated memory. The
second half of that mapping points at the same memory as the first half.
This is useful for ring buffers, because any read starting in the first
half can overflow into the second half as long as the read size is
smaller than the size of the memory area.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Consistently handle allocation failures. Some functions are changed to
return bool or int instead of void to allow returning an error.
Also fix a buffer size miscalculation in lua/uloop and use _exit() instead
of exit() on errors after forking.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
It turns out that mach_absolute_time() is not monotonic at all. While
at it, convert the CLOCK_REALTIME implementation to using
clock_get_time() as well.
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
