>>50I think the musl developers are being legalistic here. The description of fclose in C89 says it shall deliver buffered data to the host environment (just like fflush does) and return EOF if any errors occur. Not returning EOF for a write error just because it's not specifically called out like the fflush description does is bullshit, or at least very surprising.
Can you name any libc other than musl that behaves this way?