A "socket" is a loose term used to describe "an end point for communication." The traditional Berkley Socket API is a set of C function calls used to support network communication. The Sockets API is not specific to TCP/IP. Therefore, developing TCP/IP network applications requires slightly more overhead of programming and understanding to account for the generic parameters of the library's function calls. Once understood, Socket programming is as easy as reading and writing to disk files.read more...
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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