absolute path of current process

Is this:

my $path = [File::Spec->splitpath (File::Spec->rel2abs ($0))]->[1];

the only OS independent (unix/win32) way to determine the absolute path of
the directory which contains the current process, or there is a less cryptic
way that I am overlooking?

P.S. I know the above will not work if somebody tinkers with $0, but this is
not relevant to my situation.

Thanks

Peter
.

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