Julia passing a string to Fortran

General Usage
9

Here is how it works for me:

Fortran interface

module julia_interface

use ISO_C_BINDING

implicit none

public :: print_name

private

CONTAINS

subroutine print_name(name, length)
    character(kind=C_CHAR, len=length), intent(in) :: name
    integer, intent(in) :: length
    print *, name
end subroutine print_name

end module julia_interface

Julia ccall

str = "foo"
ccall(
    (:julia_interface_mp_print_name_, "./julia_interface.so"),
    Cvoid,
    (Cstring, Ref{Int32}),
    str, length(str)
)

Honestly, I still don’t understand exactly what is happening under the hook. I learned a bit about Fortran during the past two days, with the sole purpose of wrapping a subroutine in Julia. I assume Julia will automatically add a \0 to foo so the actual length is 4, which is not needed on the Fortran side?