There is no native or standard API function named CopyFileHandle in any major operating system or programming language. If you encountered this term, it is likely a conceptual phrase, a user-defined function, or a slight misremembering of specific system APIs.
Depending on your environment and target outcome, you are likely looking for one of the following mechanisms to replicate, copy, or duplicate an open file reference: 1. Windows API (Win32)
If you are developing for Windows, you cannot copy a handle by simply duplicating the variable. You must use the official kernel API.
DuplicateHandle Function: This is the exact Win32 function used to clone a HANDLE. It duplicates the handle within the same process or maps it into the context of another running process.
Behavior: The duplicated handle shares the exact same underlying file object. This means both handles share the same cursor/file pointer. If you move the pointer or read data from one handle, the other handle moves as well. 2. POSIX / Linux / macOS (C / C++)
In Unix-like systems, “file handles” are referred to as file descriptors (represented as integers).
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