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Postings from August 2013
On Sun, Aug 11, 2013 at 3:18 PM, Victor Efimov via RT <perlbug-followup@perl.org> wrote: > Also, > > (1) > > http://perldoc.perl.org/perlipc.html#Deferred-Signals-%28Safe-Signals%29 >> the solution is to use the :perlio layer to do IO--at least on those > handles that you want to be able to break into with signals. > > http://perldoc.perl.org/PerlIO.html >> The default can be overridden by setting the environment variable > PERLIO to a space separated list of layers > > it seems that the test initially had > binmode $fh, ":perlio"; binmode $fh, ":perlio" is conceptually nonsensical. You want to specify that during open, but that's broken too :-/ > but PERLIO=stdio overrides this. > so phrase "The default can be overridden by setting the environment > variable PERLIO" does not look correct. Not only default is overriden, > but any atempt to use the layer. No, it doesn't. What you're doing is effectively both: ":stdio:perlio". This will generally block unless you're reading the buffer size(Because :perlio is assuming read sementics underneath it, not fread semantics). This is a known issue that can't be fixed (stdio just sucks like that). You can kind of fix it with a «use open IO => ":pop:perlio";», it isn't pretty but I'm not sure what else would do the trick. PerlIO sucks like that. LeonThread Previous | Thread Next