os_file_size

Undocumented in source but is binding to C++. You might be able to learn more by searching the web for its name.
  1. long os_file_size(int fd)
    extern (C++) @nogc nothrow nothrow
    long
    os_file_size
    (
    int fd
    )
  2. long os_file_size(const(char)* filename)

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