robryk / parunner Goto Github PK

Tagged mode uses bufio.Scanner to split an instance's output into lines. bufio.Scanner errors out when a token is longer than 64MB, which causes parunner to fail.

We should instead either:

• fail with a better error message, or
• do not fail, warn about the problem and discard the rest of output.

Instances' stdout is not a terminal, so C stdio library uses a fixed size buffer as opposed to single-line buffer. This causes some output to be lost when an instance segfault or terminates unexpectedly in some other fashion.

It seems that the simplest way to fix this is changing stdout's buffering in zeus_local's initialization (with setvbuf).