synchronizationcopyboost-filesystemfflushfsync

fflush or sync need after boost::filesystem::copy?

I have a problem when using boot library for copying files. After copying a file, sometimes the file size if 0kb.

Here is my code:

boost::filesystem::copy("from.txt", "to.txt");

I just want to know whether should I call sync(), fsync(), or fflush() for that?

As far as I know, only stream based i/o needs fflush() to guarantee the file writing but, I cannot find the reference documentation about boost::filesystem::copy.

Solution

  • i found that an answer by myself. boost::filesystem::copy() did not need flush(). but it needs sync() when you want to put them in your flash explicitly.

    Difference between fflush and fsync