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Postings from March 2016
last year I added an entry to the 5.22.0 perldelta that described the new
Warning: unable to close filehandle %s properly: %s
warning in more detail. I propose that that text gets added to the (rather
spartan) existing entry in perldiag:
-------
=item Warning: unable to close filehandle %s properly: %s
-(S io) An error occurred when Perl implicitly closed a filehandle. This
-usually indicates your file system ran out of disk space.
+(S io) Prior to version 5.22.0, perl silently ignored any errors when
+doing an implicit close of a filehandle, I<i.e.> where the reference count
+of the filehandle reached zero and the user's code hadn't already called
+<close(); for example,
+
+ {
+ open my $fh, '>', $file or die "open: '$file': $!\n";
+ print $fh $data or die "print: $!";
+ } # implicit close here
+
+Due to buffering, in a situation such as disk full the error may only be
+detected during the final close, so not checking the result of the close
+is dangerous.
+
+So perl now warns in such situations.
--
The Enterprise is involved in a bizarre time-warp experience which is in
some way unconnected with the Late 20th Century.
-- Things That Never Happen in "Star Trek" #14
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