Yes, also tried this. No success: "Undefined subroutine &main::socketpair called"

Well then, something you're leaving out :)

As http://perl5.git.perl.org/perl.git/blob/a35ef416833511da752c4b5b836b7a8915712aab:/XSUB.h#l609 defines socketpair, so try just calling socketpair() (or my_socketpair() ) instead of call_pv-ing it

Or try call-pv-ing notxs :)

sub notxs {
    my $Rdr;
    my $Wt;
    use Socket;
    socketpair($Rdr, $Wtr, AF_UNIX, SOCK_STREAM, PF_UNSPEC);
    return $Rdr, $Wtr;
}

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In reply to Re^3: call_pv on CORE:: sub from XS by Anonymous Monk
in thread call_pv on CORE:: sub from XS by OlegG

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