/* libguestfs
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009-2010 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include <caml/fail.h>
#include <caml/memory.h>
#include <caml/mlvalues.h>
+#include <caml/printexc.h>
+#include <caml/signals.h>
#include "guestfs_c.h"
+static void clear_progress_callback (guestfs_h *g);
+static void progress_callback (guestfs_h *g, void *data, int proc_nr, int serial, uint64_t position, uint64_t total);
+
/* This macro was added in OCaml 3.10. Backport for earlier versions. */
#ifndef CAMLreturnT
#define CAMLreturnT(type, result) do{ \
/* These prototypes are solely to quiet gcc warning. */
CAMLprim value ocaml_guestfs_create (void);
CAMLprim value ocaml_guestfs_close (value gv);
+CAMLprim value ocaml_guestfs_set_progress_callback (value gv, value closure);
+CAMLprim value ocaml_guestfs_clear_progress_callback (value gv);
/* Allocate handles and deal with finalization. */
static void
guestfs_finalize (value gv)
{
guestfs_h *g = Guestfs_val (gv);
- if (g) guestfs_close (g);
+ if (g) {
+ clear_progress_callback (g);
+ guestfs_close (g);
+ }
}
static struct custom_operations guestfs_custom_operations = {
CAMLreturn (Val_unit);
}
-/* Copy string array value.
- * The return value is only 'safe' provided we don't allocate anything
- * further on the OCaml heap (ie. cannot trigger the OCaml GC) because
- * that could move the strings around.
- */
+/* Copy string array value. */
char **
ocaml_guestfs_strings_val (guestfs_h *g, value sv)
{
r = guestfs_safe_malloc (g, sizeof (char *) * (Wosize_val (sv) + 1));
for (i = 0; i < Wosize_val (sv); ++i)
- r[i] = String_val (Field (sv, i));
+ r[i] = guestfs_safe_strdup (g, String_val (Field (sv, i)));
r[i] = NULL;
CAMLreturnT (char **, r);
void
ocaml_guestfs_free_strings (char **argv)
{
- /* Don't free the actual strings - they are String_vals on
- * the OCaml heap.
- */
+ unsigned int i;
+
+ for (i = 0; argv[i] != NULL; ++i)
+ free (argv[i]);
free (argv);
}
+
+#define PROGRESS_ROOT_KEY "_ocaml_progress_root"
+
+/* Guestfs.set_progress_callback */
+CAMLprim value
+ocaml_guestfs_set_progress_callback (value gv, value closure)
+{
+ CAMLparam2 (gv, closure);
+
+ guestfs_h *g = Guestfs_val (gv);
+ clear_progress_callback (g);
+
+ value *root = guestfs_safe_malloc (g, sizeof *root);
+ *root = closure;
+
+ /* XXX This global root is generational, but we cannot rely on every
+ * user having the OCaml 3.11 version which supports this.
+ */
+ caml_register_global_root (root);
+
+ guestfs_set_private (g, PROGRESS_ROOT_KEY, root);
+
+ guestfs_set_progress_callback (g, progress_callback, root);
+
+ CAMLreturn (Val_unit);
+}
+
+/* Guestfs.clear_progress_callback */
+CAMLprim value
+ocaml_guestfs_clear_progress_callback (value gv)
+{
+ CAMLparam1 (gv);
+
+ guestfs_h *g = Guestfs_val (gv);
+ clear_progress_callback (g);
+
+ CAMLreturn (Val_unit);
+}
+
+static void
+clear_progress_callback (guestfs_h *g)
+{
+ guestfs_set_progress_callback (g, NULL, NULL);
+
+ value *root = guestfs_get_private (g, PROGRESS_ROOT_KEY);
+ if (root) {
+ caml_remove_global_root (root);
+ free (root);
+ guestfs_set_private (g, PROGRESS_ROOT_KEY, NULL);
+ }
+}
+
+static void
+progress_callback (guestfs_h *g, void *root,
+ int proc_nr, int serial, uint64_t position, uint64_t total)
+{
+ CAMLparam0 ();
+ CAMLlocal5 (proc_nrv, serialv, positionv, totalv, rv);
+
+ proc_nrv = Val_int (proc_nr);
+ serialv = Val_int (serial);
+ positionv = caml_copy_int64 (position);
+ totalv = caml_copy_int64 (total);
+
+ value args[4] = { proc_nrv, serialv, positionv, totalv };
+
+ caml_leave_blocking_section ();
+ rv = caml_callbackN_exn (*(value*)root, 4, args);
+ caml_enter_blocking_section ();
+
+ /* Callbacks shouldn't throw exceptions. There's not much we can do
+ * except to print it.
+ */
+ if (Is_exception_result (rv))
+ fprintf (stderr, "libguestfs: uncaught OCaml exception in progress callback: %s",
+ caml_format_exception (Extract_exception (rv)));
+
+ CAMLreturn0;
+}