D6830: Make use of kauth helper in copy method of file ioslave

[Chinmoy Ranjan Pradhan]

chinmoyr updated this revision to Diff 19166.
chinmoyr added a comment.


  - Added method tryOpen
  - Ensured correct permissions are set on the newly created file.
  - auto ret -> auto err
  - There's no method like failed() in PrivOpReturnValue. We have to  leave those calls as they are.

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D6830?vs=18695&id=19166

REVISION DETAIL
  https://phabricator.kde.org/D6830

AFFECTED FILES
  src/ioslaves/file/file.h
  src/ioslaves/file/file_unix.cpp

To: chinmoyr, dfaure, #frameworks
Cc: elvisangelaccio, #frameworks
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