bug#27782: patch for mmap and friends

[Matt Wette]

On 1/14/23 2:42 PM, Maxime Devos wrote:

    {
      /* Use the fd of the port under clobber protection from
         concurrency. As scm_dynwind_acquire_port assumes that
         FILE is a port, check that first. */
      SCM_VALIDATE_PORT (SCM_ARG5, file);
      scm_dynwind_acquire_port (file);
      c_fd = scm_fileno (file);
    }

Thanks.  I'll try this, modulo update to  scm_to_int (scm_fileno (file)).

Matt