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I have relatively new to C++ and I am learning from another guy's code. His code reads from a mmapped file, but does not free any mapped memory in the end. In my understanding, mmap() map files into virtual memory. Don't I need to release those mapped memory in some way, like, calling munmap()?
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The mmap() function is used for mapping between a process address space and either files or devices. When a file is mapped to a process address space, the file can be accessed like an array in the program.
munmap(allocation, 5000); free(3) can only be used to free memory allocated via malloc(3) .
mmap() and munmap() functions are provided by sys/mman. h library.
I believe you should release mapped memory with munmap. But it will be released automatically (like close syscall for regular files or sockets) after exit(). Remember, that implicit closing/unmapping is bad style!
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When you are done just use munmap() unless your program is exiting, then there is no need, it will unmap the segment(s) automatically at exit.
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