The socket library is part of the Ruby standard library. Similar to libraries such as openssl, zlib and curses, the socket library has a thin binding relationship with the C language library it depends on. The socket library has been stable in multiple Ruby releases.
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What does thin binding mean here?
What is the relationship between the socket library of high-level languages and the socket of the operating system?
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"Thin package".
The socket library of high-level languages calls the socket interface of the operating system (through the C library or directly).