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I’m learning C/C++ right now and I am reading about file operations. Suppose a program A is working with an external file (say, a text file) and another another program B is, say, trying to move the file (or worse, delete it). Is it possible to tell the OS to inform the program B that the file is in use, even though it was not created by program A?
What you’re trying to do is called file locking. Search for “file locking in C”.