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lix/doc/manual/rl-next/haunted-gc-macos.md

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darwin: workaround PROC_PIDLISTFDS on processes with no fds This has been causing various seemingly spurious CI failures as well as some failures on people running tests on beta builds. lix> ++(nix-collect-garbage-dry-run.sh:20) nix-store --gc --print-dead lix> ++(nix-collect-garbage-dry-run.sh:20) wc -l lix> finding garbage collector roots... lix> error: Listing pid 87261 file descriptors: Undefined error: 0 There is no real way to write a proper test for this, other than to start a process like the following: int main(void) { for (int i = 0; i < 1000; ++i) { close(i); } sleep(10000); } and then let Lix's gc look at it. I have a relatively high confidence this *will* fix the problem since I have manually confirmed the behaviour of the libproc call is as-unexpected, and it would perfectly explain the observed symptom. Fixes: https://git.lix.systems/lix-project/lix/issues/446 Change-Id: I67669b98377af17895644b3bafdf42fc33abd076
2024-08-07 09:00:50 +00:00
---
synopsis: "Fix unexpectedly-successful GC failures on macOS"
cls: 1723
issues: fj#446
credits: jade
category: Fixes
---
Has the following happened to you on macOS? This failure has been successfully eliminated, thanks to our successful deployment of advanced successful-failure detection technology (it's just `if (failed && errno == 0)`. Patent pending<sup>not really</sup>):
```
$ nix-store --gc --print-dead
finding garbage collector roots...
error: Listing pid 87261 file descriptors: Undefined error: 0
```
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