Apparently it wasn't that good, otherwise you could tell the difference, since those APIs aren't proving by Linux kernel, rather bionic C library.

Also I they aren't listed as official NDKs APIs, because POSIX isn't part of neither ISO C, nor ISO C++, hence hack.

https://developer.android.com/ndk/guides/stable_apis

A hack that termux folks now suffer from, because it fails Play Store API validation for forking processes, which sidelining works around, until Google decides to forbid that as well.

Coding since 1980's, and only fools are afraid to be embarrassed.