changes for vxworks

[Anupamvashistha2002]

Summary

This PR improves support for the vxworks target in the Rust standard library by fixing platform-specific issues and ensuring better compatibility with VxWorks.

These changes are isolated to vxworks and do not affect other platforms.

Notes

Tested manually on a VxWorks environment. Feedback on potential edge cases or additional tests would be appreciated.

[rustbot]

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[rust-log-analyzer]

The job tidy failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

##[endgroup]
[TIMING:end] tool::ToolBuild { build_compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu, tool: "tidy", path: "src/tools/tidy", mode: ToolBootstrap, source_type: InTree, extra_features: [], allow_features: "", cargo_args: [], artifact_kind: Binary } -- 11.121
[TIMING:end] tool::Tidy { compiler: Compiler { stage: 0, host: x86_64-unknown-linux-gnu, forced_compiler: false }, target: x86_64-unknown-linux-gnu } -- 0.000
fmt check
Diff in /checkout/library/std/src/fs/tests.rs:802:
     let canary = tmpdir.join("do_not_delete");
     check!(check!(File::create(&canary)).write(b"foo"));
     let result = fs::remove_dir_all(&canary);
-    #[cfg(all(not(target_os = "vxworks"),unix))]
+    #[cfg(all(not(target_os = "vxworks"), unix))]
     error!(result, "Not a directory");
     #[cfg(target_os = "vxworks")]
     error!(result, "not a directory");
fmt: checked 6344 files
Bootstrap failed while executing `test src/tools/tidy tidyselftest --extra-checks=py,cpp,js,spellcheck`
Build completed unsuccessfully in 0:00:48
  local time: Mon Sep  1 05:22:38 UTC 2025
  network time: Mon, 01 Sep 2025 05:22:38 GMT

[folkertdev]

Can you make these look like this, with some reasoning for why this test is ignored on vxworks (is there a fundamental reason, is it just not implemented yet, etc)?

Suggested change

	#[cfg_attr(any(target_os = "vxworks", target_os = "android"), ignore)]
	#[cfg_attr(target_os = "android", ignore = "Android SELinux rules prevent creating Unix sockets")]
	#[cfg_attr(target_os = "vxworks", ignore = "...")]

[folkertdev]

This is cleaner as a cfg_select!, e.g.

Suggested change

	#[cfg(all(not(target_os = "vxworks"),unix))]
	error!(result, "Not a directory");
	#[cfg(target_os = "vxworks")]
	error!(result, "not a directory");
	cfg_select! {
	target_os = "vxworks" => {
	error!(result, "not a directory");
	}
	unix => {
	error!(result, "Not a directory");
	}
	windows => {
	error!(result, 267); // ERROR_DIRECTORY - The directory name is invalid.
	}
	_ => {
	// all good.
	}
	}

[tgross35]

changes for vxworks

This PR improves support for the vxworks target in the Rust standard library by fixing platform-specific issues and ensuring better compatibility with VxWorks.

These changes are isolated to vxworks and do not affect other platforms

This description restates in four different ways that it improves vxworks support, but gives no indication of what it changes or why that is. Please make sure it’s easy for reviewers to understand what is going on, even “Ignore X-related tests that currently fail on VxWorks” is more useful.

Pinging target maintainer @biabbas for review