+#define PROGRESS_KEY \"_perl_progress_cb\"
+
+static void
+_clear_progress_callback (guestfs_h *g)
+{
+ guestfs_set_progress_callback (g, NULL, NULL);
+ SV *cb = guestfs_get_private (g, PROGRESS_KEY);
+ if (cb) {
+ guestfs_set_private (g, PROGRESS_KEY, NULL);
+ SvREFCNT_dec (cb);
+ }
+}
+
+/* http://www.perlmonks.org/?node=338857 */
+static void
+_progress_callback (guestfs_h *g, void *cb,
+ int proc_nr, int serial, uint64_t position, uint64_t total)
+{
+ dSP;
+ ENTER;
+ SAVETMPS;
+ PUSHMARK (SP);
+ XPUSHs (sv_2mortal (newSViv (proc_nr)));
+ XPUSHs (sv_2mortal (newSViv (serial)));
+ XPUSHs (sv_2mortal (my_newSVull (position)));
+ XPUSHs (sv_2mortal (my_newSVull (total)));
+ PUTBACK;
+ call_sv ((SV *) cb, G_VOID | G_DISCARD | G_EVAL);
+ FREETMPS;
+ LEAVE;
+}
+
+static void
+_close_handle (guestfs_h *g)
+{
+ assert (g != NULL);
+ _clear_progress_callback (g);
+ guestfs_close (g);
+}
+