Let windows Perl programs call setvbuf on file handles

[p5pRT]

Migrated from rt.perl.org#127805 (status was 'new')

Searchable as RT127805$

[p5pRT]

From spam-bitcard@yary.ack.org

An infrequently asked Perl5 question is how to adjust the read-ahead buffer for normal reads. Example discussions on the web include

http​://stackoverflow.com/questions/1251062/how-can-i-set-the-file-read-buffer-size-in-perl-to-optimize-it-for-large-files

http​://perlmonks.org/?node_id=692348 "4k read buffer is too small"

The best-documented answer these days is setvbuf as mentioned in the IO​::Handle docs. However​: "IO​::Handle​::setvbuf() is not available by default on Perls 5.8.0 and later" and indeed that's the case- it doesn't seem to be available on my Strawberry Perl 5.22, even if I open a handle with the "​:stdio" layer.

Being able to adjust a filehandle's read-ahead buffer size is occasionally useful for some unusual scenarios. -> It would be great to provide a way to set the buffer size in IO​::Handle with current Perl.

even if it isn't feasible to implement this feature request, there is now a layer module on CPAN that provides this- PerlIO​::buffersize - perhaps that module could be mentioned alongside "setbuf" in the IO​::Handle docs as an alternative.

[p5pRT]

From spam-bitcard@yary.ack.org

Realized the "subject" of the ticket didn't match the contents very well- am editing it.

[p5pRT]

From [Unknown Contact. See original ticket]

Realized the "subject" of the ticket didn't match the contents very well- am editing it.