Your args as in the example are a hash, so in the absence of any indication of why you want to use prototypes the obvious works for me:

#!/usr/bin/perl -w
use strict;

my @aFieldHeaders;
my %hFieldConfigs;
sub ConfigRead (%);

my $sConfigFile = 'mydata.csv';
ConfigRead(sFILE => $sConfigFile,
           apHEAD => \@aFieldHeaders,
           hpFIELDCONF => \%hFieldConfigs);

# my array and hash now have some cool stuff in 'em!


sub ConfigRead (%) {
    my %hArgs = (
        sFILE    => 'BAD',      # lazy user alert! whine & die
        apHEAD  => 'BAD',       # ^^^ see comment above
        hpFIELDCONF => 'BAD',   # by now you know the drill!
        @_,                     # user demands come from here
    );
    
    # stick some cool stuff in their variables
}
[download]

But as everyone else has said: don't do that unless you have a good reason.

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