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> Fine, cannot we mmap at the time of the first read then (and if fall back to > non-mmap stdio if that is not possible)? That seems more desireable to me anyway. As it stands, a program that just calls fopen and then fileno and does not io, or just uses fopen+fclose to test existence (I have seen such things) will map in the contents of the file when that's never required at all.
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