WebAssembly & CloudABI
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ABI stands for Application Binary Interface (wiki page).
We can see an ABI as a contract between two binary applications, to assure that one binary is able to access certain native functions from the other binary.
Each time we compile a C or C++ application there is a set of system calls that the application will normally use, for example, to open a file, read its contents… or even opening a socket.
For doing that, the applications normally target the POSIX ABI to run these syscalls in Unix-like systems. There are different implementations following POSIX, such as libc, musl…
Read the article: https://medium.com/wasmer/webassembly-cloudabi-b573047fd0a9