软件包：libghc-atomic-write-dev（0.2.1.0-1 以及其他的） [debports]
Atomically write to a file
Atomically write to a file on POSIX-compliant systems while preserving permissions.
On most Unix systems, `mv` is an atomic operation. This makes it simple to write to a file atomically just by using the mv operation. However, this will destroy the permissions on the original file. This library does the following to preserve permissions while atomically writing to a file:
* If an original file exists, take those permissions and apply them to the temp file before `mv`ing the file into place.
* If the original file does not exist, create a following with default permissions (based on the currently-active umask).
This way, when the file is `mv`'ed into place, the permissions will be the ones held by the original file.
This library is based on similar implementations found in common libraries in Ruby and Python.
This package provides a library for the Haskell programming language. See http://www.haskell.org/ for more information on Haskell.
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