[Libguestfs] [PATCH nbdkit v2 04/11] ocaml: Implement .can_multi_conn callback for OCaml plugins.
---
plugins/ocaml/ocaml.c | 25 +++++++++++++++++++++++++
plugins/ocaml/NBDKit.ml | 10 +++++++++-
plugins/ocaml/NBDKit.mli | 2 ++
3 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/plugins/ocaml/ocaml.c b/plugins/ocaml/ocaml.c
index 7dd5e4e..a89ad08 100644
--- a/plugins/ocaml/ocaml.c
+++ b/plugins/ocaml/ocaml.c
@@ -111,6 +111,8 @@ static value flush_fn;
static value trim_fn;
static value zero_fn;
+static value can_multi_conn_fn;
+
/* Wrapper functions that translate calls from C (ie. nbdkit) to OCaml. */
static void
@@ -167,6 +169,8 @@ unload_wrapper (void)
REMOVE (flush);
REMOVE (trim);
REMOVE (zero);
+
+ REMOVE (can_multi_conn);
}
static int
@@ -550,6 +554,25 @@ zero_wrapper (void *h, uint32_t count, uint64_t offset, uint32_t
flags)
CAMLreturnT (int, 0);
}
+static int
+can_multi_conn_wrapper (void *h)
+{
+ CAMLparam0 ();
+ CAMLlocal1 (rv);
+
+ caml_leave_blocking_section ();
+
+ rv = caml_callback_exn (can_multi_conn_fn, *(value *) h);
+ if (Is_exception_result (rv)) {
+ nbdkit_error ("%s", caml_format_exception (Extract_exception (rv)));
+ caml_enter_blocking_section ();
+ CAMLreturnT (int, -1);
+ }
+
+ caml_enter_blocking_section ();
+ CAMLreturnT (int, Bool_val (rv));
+}
+
value
ocaml_nbdkit_set_thread_model (value modelv)
{
@@ -629,6 +652,8 @@ SET(flush)
SET(trim)
SET(zero)
+SET(can_multi_conn)
+
/* NB: noalloc function. */
value
ocaml_nbdkit_set_error (value nv)
diff --git a/plugins/ocaml/NBDKit.ml b/plugins/ocaml/NBDKit.ml
index 1937bc2..fdeecd3 100644
--- a/plugins/ocaml/NBDKit.ml
+++ b/plugins/ocaml/NBDKit.ml
@@ -71,6 +71,8 @@ type 'a plugin = {
flush : ('a -> flags -> unit) option;
trim : ('a -> int32 -> int64 -> flags -> unit) option;
zero : ('a -> int32 -> int64 -> flags -> unit) option;
+
+ can_multi_conn : ('a -> bool) option;
}
let default_callbacks = {
@@ -106,6 +108,8 @@ let default_callbacks = {
flush = None;
trim = None;
zero = None;
+
+ can_multi_conn = None;
}
type thread_model =
@@ -149,6 +153,8 @@ external set_flush : ('a -> flags -> unit) -> unit =
"ocaml_nbdkit_set_flush"
external set_trim : ('a -> int32 -> int64 -> flags -> unit) -> unit =
"ocaml_nbdkit_set_trim"
external set_zero : ('a -> int32 -> int64 -> flags -> unit) -> unit =
"ocaml_nbdkit_set_zero"
+external set_can_multi_conn : ('a -> bool) -> unit =
"ocaml_nbdkit_set_can_multi_conn"
+
let may f = function None -> () | Some a -> f a
let register_plugin thread_model plugin =
@@ -203,7 +209,9 @@ let register_plugin thread_model plugin =
may set_pwrite plugin.pwrite;
may set_flush plugin.flush;
may set_trim plugin.trim;
- may set_zero plugin.zero
+ may set_zero plugin.zero;
+
+ may set_can_multi_conn plugin.can_multi_conn
external _set_error : int -> unit = "ocaml_nbdkit_set_error"
"noalloc"
diff --git a/plugins/ocaml/NBDKit.mli b/plugins/ocaml/NBDKit.mli
index c0f9248..ec888ce 100644
--- a/plugins/ocaml/NBDKit.mli
+++ b/plugins/ocaml/NBDKit.mli
@@ -73,6 +73,8 @@ type 'a plugin = {
flush : ('a -> flags -> unit) option;
trim : ('a -> int32 -> int64 -> flags -> unit) option;
zero : ('a -> int32 -> int64 -> flags -> unit) option;
+
+ can_multi_conn : ('a -> bool) option;
}
(** The plugin fields and callbacks. ['a] is the handle type. *)
--
2.19.2