what is libc and posix exactly?

i am really confused. please look at the following picture: i found out that there is a library in linux called glibc, which when we execute our c/c++ programs we use its functions and it calls the appropriate system call. in fact it's API that we can use it. but i'm confused. does glibc put in operating system that we use it for our c/c++ programs? so when we write a python/ruby/... program there is no standard library or API , like glibc, that we call its functions and it calls the appropriate system call. so how our codes in python/ruby/... run? also, what is posix? i read wikipedi. but i can't understand. how is it relate to libc? please give me examples and simple explanations that i can find out

https://stackoverflow.com/questions/66823018/what-is-libc-and-posix-exactly March 27, 2021 at 03:10AM