Lighttpd

Yes it is ridiculous and I already figured it is a bug on the tablet as the kernel version is high enough to support SOCK_NONBLOCK, but this tablet and others like it might not be getting any more system updates (I mainly use it to make sure our project still works with old Android devices). I haven't yet posted a bug report to Android I am going to check if Google's Android Emulators also have the bug first, the reason why I only just noticed this issue is I've been updating the build system that we use for the project that the company I work for is working on and the previous Android NDK we were using didn't define SOCK_CLOEXEC or SOCK_NONBLOCK when targeting older Android versions.

My main reason for filing the bug in lighttpd though was that other Android or even non-Android or non-Linux systems may be affected where a user compiles the latest lighttpd on a dev system that defines SOCK_NONBLOCK, but the system they deploy to has this issue but for whatever reason they are unable to update their operating system/libraries, and since lighttpd already had some checks for SOCK_CLOEXEC it seemed like adding additonal checks as per the test program would be fairly straight forward.

where a user compiles the latest lighttpd on a dev system that defines SOCK_NONBLOCK, but the system they deploy to has this issue

It is often unwise to compile and build on a system with libraries newer than the target systems to which it will be deployed. If your cross-compilation environment provides the definitions for SOCK_NONBLOCK, then it is reasonable to assume that the target system will be running kernels that support SOCK_NONBLOCK or that the system libraries will properly return an error, e.g EINVAL for the unsupported flag.

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I have posted a preliminary patch to my personal/gstrauss/master branch. See DevelGit

It looks like that patch has fixed the problem on my tablet. Thanks. I have also tested various Android versions with Android Emulator and they don't appear to have the problem.