QFile::copy(): don't trust the old file metadata cache

Instead, let's just use sendfile(2) in a loop until it returns 0, which
indicates EOF.

[ChangeLog][QtCore][QFile] Fixed a regression in QFile::copy() that
caused the original file not to be copied entirely if it was modified
outside of this QFile object between the last time we checked its size
and the copy() call. Note this is not a prevention against race
conditions.

Task-number: QTBUG-69417
Change-Id: Id59bdd8f1a804b809e22fffd15406c8aa31f4a1e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

0 files changed, 0 insertions, 0 deletions