binmode($fh, ':raw'); is the same thing as binmode($fh);, but they're not the same as using :raw with open.

Using binmode :raw disables layers that can be disabled. This doesn't disable buffering if the underlying layer does any.

Using open :raw prevents some layers from being added in the first place, and this has been shown to prevent buffering. 

$ perl -le'open $fh, "<", "foo"; print for PerlIO::get_layers($fh)'
unix
perlio

$ perl -le'open $fh, "<", "foo"; binmode $fh; print for PerlIO::get_la
+yers($fh)'
unix
perlio

$ perl -le'open $fh, "<", "foo"; binmode $fh, ":raw"; print for PerlIO
+::get_layers($fh)'
unix
perlio

$ perl -le'open $fh, "<:raw", "foo"; print for PerlIO::get_layers($fh)
+'
unix

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In reply to Re^4: help in ruby code to perl by ikegami
in thread help in ruby code to perl by eviltom

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