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50
fmap_t *fmap(int fd, off_t offset, size_t len);
51
fmap_t *fmap_check_empty(int fd, off_t offset, size_t len, int *empty);
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53
void *fmap_need_off(fmap_t *m, size_t at, size_t len);
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void *fmap_need_off_once(fmap_t *m, size_t at, size_t len);