could not find ucontext in nix for aarch64-linux-android

[yujack008]

error[E0433]: failed to resolve: could not find ucontext in nix
--> src\main.rs:22:39
|
22 | if let Ok(context) = nix::ucontext::UContext::get() {
| ^^^^^^^^ could not find ucontext in nix

nix = { version = "0.28.0", features = ["signal","ucontext"] }

[SteveLauC]

Yeah, it is currently exclusive to Linux, we can add it for Android if the required libc types and constants are available

[asomers]

@yujack008 are you sure that setcontext and getcontext are implemented on Android? My googling suggests that they are not.
https://android.googlesource.com/platform/bionic/+/c124baa/libc/arch-arm/include/machine/ucontext.h
https://groups.google.com/g/android-ndk/c/rbrQGZxuUSM?pli=1
https://lwn.net/Articles/496359/

[SteveLauC]

Yeah, it seems that they are not implemented on Android.

$ cd bionic
$ rg "setcontext"
$ rg "getcontext"
$

[asomers]

So there's nothing we can do.