(Update: I hadn't seen your follow-up note about the -d:NYTProf before posting this... If you need to do it from within the Perl code itself, this of course wouldn't work.)
You could use the respective system call tracing tool, e.g. on
$ strace -e execve -s 200 perl -le '$/ = "\0"; open my $fh, "/proc/$$/
+cmdline"; print for <$fh>'
execve("/usr/local/bin/perl", ["perl", "-le", "$/ = \"\\0\"; open my $
+fh, \"/proc/$$/cmdline\"; print for <$fh>"], [/* 71 vars */]) = 0
(add the option -f in a more complex setup, where perl is being called somewhere further down the fork-exec line...)
Other systems have other system call tracers (see this node for an
attempt of mine to put together a list).
This approach isn't really portable either... but you should at
least be able to get it working somehow — which you otherwise couldn't if
there's no /proc file system.
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