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#!./perl -w
#
# Exercise the error handling callback mechanism in gdbm.
#
# Try to trigger an error by surreptitiously closing the file handle which
# gdbm has opened. Note that this won't trigger an error in newer
# releases of the gdbm library, which uses mmap() rather than write() etc:
# so skip in that case.
use strict;
use Test::More;
use Config;
use File::Temp 'tempdir';
use File::Spec;
BEGIN {
plan(skip_all => "GDBM_File was not built")
unless $Config{extensions} =~ /\bGDBM_File\b/;
# https://rt.perl.org/Public/Bug/Display.html?id=117967
plan(skip_all => "GDBM_File is flaky in $^O")
if $^O =~ /darwin/;
plan(tests => 8);
use_ok('GDBM_File');
}
open my $fh, '<', $^X or die "Can't open $^X: $!";
my $fileno = fileno $fh;
isnt($fileno, undef, "Can find next available file descriptor");
close $fh or die $!;
is((open $fh, "<&=$fileno"), undef,
"Check that we cannot open fileno $fileno. \$! is $!");
umask(0);
my $wd = tempdir(CLEANUP => 1);
my %h;
isa_ok(tie(%h, 'GDBM_File', File::Spec->catfile($wd, 'fatal_dbmx'),
GDBM_WRCREAT, 0640), 'GDBM_File');
isnt((open $fh, "<&=$fileno"), undef, "dup fileno $fileno")
or diag("\$! = $!");
isnt(close $fh, undef,
"close fileno $fileno, out from underneath the GDBM_File");
# store some data to a closed file handle
my $res = eval {
$h{Perl} = 'Rules';
untie %h;
99;
};
SKIP: {
skip "Can't trigger failure", 2 if (defined $res and $res == 99);
is $res, undef, "eval should return undef";
# Observed "File write error" and "lseek error" from two different
# systems. So there might be more variants. Important part was that
# we trapped the error # via croak.
like($@, qr/ at .*\bfatal\.t line \d+\.\n\z/,
'expected error message from GDBM_File');
}
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