Here's a simple one I use, to locally override something: package MyApp::Local;
use strict;
sub umask {
my($class, $umask) = @_;
my $old = umask $umask;
$class->new(sub { umask $old });
}
# ... and various other more application-specific methods
sub new {
my($class, $cb) = @_;
bless $cb, $class;
}
sub DESTROY {
my $self = shift;
$self->();
undef;
}
1;
Example use: ...
{
# create the file, must be world-writable
my $temp = MyApp::Local->umask(0);
my $fh;
sysopen($fh, $path, O_WRONLY | O_CREAT | O_EXCL, 0666)
or die "$path: $!\n";
close $fh;
# umask restored when $temp goes out of scope, even by dying
}
...
No particular reason this couldn't be a { callback => $cb } hashref, just didn't see the need.
Hugo
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