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cfilemmap

is write to the middle of mapped adress will grow the file? just like fseek does?

sample illustration

if I write data to the middle of the allocated address space, will the file size increase. just like fseek does ?

or it will write to the beginning of the file ?

Solution

  • The answer is no. writeto mmap will not grow the file or create sparse file. I have to allocate the file manually.