Ivan Gankevich

Results 2 issues of Ivan Gankevich

This PR adds process polling capabilities via `Process` type that implements `Source`. * On Linux the polling is done via [`pidfd`](https://man7.org/linux/man-pages/man2/pidfd_open.2.html). * On MacOS/BSD it is done via `EVFILT_PROC` filter...

Previously the length of the gas metering stub was incorrectly added to the length of the instruction that comes after. For long instructions such as 66-byte `div` this resulted in...