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//opt/alt/ruby18/share/ri/1.8/system/IO/fsync-i.yaml
--- !ruby/object:RI::MethodDescription aliases: [] block_params: comment: - !ruby/struct:SM::Flow::P body: Immediately writes all buffered data in <em>ios</em> to disk. Returns <tt>nil</tt> if the underlying operating system does not support <em>fsync(2)</em>. Note that <tt>fsync</tt> differs from using <tt>IO#sync=</tt>. The latter ensures that data is flushed from Ruby's buffers, but doesn't not guarantee that the underlying operating system actually writes it to disk. full_name: IO#fsync is_singleton: false name: fsync params: | ios.fsync => 0 or nil visibility: public
