Brendan Hansknecht (Jul 17 2024 at 02:23): Brendan Hansknecht (Jul 17 2024 at 02:23):If anyone has ideas. They would be much appreciate a bit of help.
Somehow, updating how we use tcp streams broke stdin.
This commit: https://github.com/roc-lang/basic-cli/commit/b495041380615814bc2f163e0f1f61bfac39bf54
from the automatic-file-closing branch on basic cli. only touches tcp streams.
Somehow, whenever reading stdin on this branch, it immediately gets EOF.
Brendan Hansknecht (Jul 17 2024 at 02:23):There is a chance that I did something unsafe with pointers and it broke stdin, but that would surprise me.
Brendan Hansknecht (Jul 17 2024 at 02:23):valgrind doesn't find anything.
Brendan Hansknecht (Jul 17 2024 at 05:59):Trying to debug this a bit more, It seems that allocating a buffered tcp stream into the heap is where the issue arises. It kinda feels like I use the mmap and then stdin suddenly has no data anymore.
Makes me feel like I might be writing to entirely the wrong location and breaking something, but from what I can tell, I am correctly writing into the mmap.
Brendan Hansknecht (Jul 17 2024 at 06:00):hmm, actually the error comes through in roc, so it may be delayed.
Brendan Hansknecht (Jul 17 2024 at 06:21):Actually seems nondeterministic depending on the exact build config. All roc refcount prints look correct....still very lost.
Definitely a spooky action at a distance kinda bug that feels like a I rolled the dice and uncovered something that has always been broken rather than something this commit broke, but not sure.
Brendan Hansknecht (Jul 17 2024 at 23:20):For now, just decided to revert the tcp change and move on.
Luke Boswell (Jul 17 2024 at 23:21):So just looking at files then?
Brendan Hansknecht (Jul 17 2024 at 23:21):Yeah, updating files to automatically close and adding in mmap
Last updated: Jul 26 2025 at 12:14 UTC