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[libvirt] [ocaml PATCH 3/4] Add event callback implementation based on virConnectDomainEventRegisterAny



A client may register a callback as follows:

    E.register_default_impl ();

    let conn = C.connect_readonly ?name () in

    let id = E.register_any conn (E.Lifecycle (fun dom e ->
        printd dom "Lifecycle %s" (E.Lifecycle.to_string e)
    )) in

Internally this will:
  1. generate a unique int64 used to identify the specific callback
  2. add the callback to an OCaml hashtable based on the signature
     (there is a distinct hashtable per callback signature)
  3. call virConnectDomainEventRegisterAny which registers a
     generic C callback in the stubs (one distinct callback per
     signature) and supply the int64 as the "opaque" data

The client must enter the event loop with:

    while true do
        E.run_default_impl ()
    done

When an event is triggered, the C callback will upcall into an OCaml
function (having re-acquired the heap lock) supplying the int64 value.
The OCaml function can then find the right callback in the Hashtbl
and call it.

The client can deregister the callback with:

  E.deregister_any conn id;

Signed-off-by: David Scott <dave scott eu citrix com>
---
 libvirt/generator.pl        |   2 +
 libvirt/libvirt.ml          | 765 ++++++++++++++++++++++++++++++++++++++++++++
 libvirt/libvirt.mli         | 355 ++++++++++++++++++++
 libvirt/libvirt_c.c         |  19 ++
 libvirt/libvirt_c_oneoffs.c | 411 ++++++++++++++++++++++++
 5 files changed, 1552 insertions(+)

diff --git a/libvirt/generator.pl b/libvirt/generator.pl
index ab8900e..8229ad1 100755
--- a/libvirt/generator.pl
+++ b/libvirt/generator.pl
@@ -59,6 +59,8 @@ my @functions = (
     { name => "virConnectListDefinedStoragePools",
       sig => "conn, int : string array" },
     { name => "virConnectGetCapabilities", sig => "conn : string" },
+    { name => "virConnectDomainEventDeregisterAny",
+      sig => "conn, int : unit" },
 
     { name => "virDomainCreateLinux", sig => "conn, string, 0U : dom" },
     { name => "virDomainFree", sig => "dom : free" },
diff --git a/libvirt/libvirt.ml b/libvirt/libvirt.ml
index 784a2b5..9c9368a 100644
--- a/libvirt/libvirt.ml
+++ b/libvirt/libvirt.ml
@@ -483,6 +483,771 @@ struct
     map_ignore_errors (fun dom -> (dom, get_info dom)) doms
 end
 
+module Event =
+struct
+
+  module Defined = struct
+    type t = [
+      | `Added
+      | `Updated
+      | `Unknown of int
+    ]
+
+    let to_string = function
+      | `Added -> "Added"
+      | `Updated -> "Updated"
+      | `Unknown x -> Printf.sprintf "Unknown Defined.detail: %d" x
+
+    let make = function
+      | 0 -> `Added
+      | 1 -> `Updated
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module Undefined = struct
+    type t = [
+      | `Removed
+      | `Unknown of int
+    ]
+
+    let to_string = function
+      | `Removed -> "UndefinedRemoved"
+      | `Unknown x -> Printf.sprintf "Unknown Undefined.detail: %d" x
+
+    let make = function
+      | 0 -> `Removed
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module Started = struct
+    type t = [
+      | `Booted
+      | `Migrated
+      | `Restored
+      | `FromSnapshot
+      | `Wakeup
+      | `Unknown of int
+    ]
+
+    let to_string = function
+      | `Booted -> "Booted"
+      | `Migrated -> "Migrated"
+      | `Restored -> "Restored"
+      | `FromSnapshot -> "FromSnapshot"
+      | `Wakeup -> "Wakeup"
+      | `Unknown x -> Printf.sprintf "Unknown Started.detail: %d" x
+ 
+    let make = function
+      | 0 -> `Booted
+      | 1 -> `Migrated
+      | 2 -> `Restored
+      | 3 -> `FromSnapshot
+      | 4 -> `Wakeup
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module Suspended = struct
+    type t = [
+      | `Paused
+      | `Migrated
+      | `IOError
+      | `Watchdog
+      | `Restored
+      | `FromSnapshot
+      | `APIError
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let to_string = function
+      | `Paused -> "Paused"
+      | `Migrated -> "Migrated"
+      | `IOError -> "IOError"
+      | `Watchdog -> "Watchdog"
+      | `Restored -> "Restored"
+      | `FromSnapshot -> "FromSnapshot"
+      | `APIError -> "APIError"
+      | `Unknown x -> Printf.sprintf "Unknown Suspended.detail: %d" x
+
+     let make = function
+      | 0 -> `Paused
+      | 1 -> `Migrated
+      | 2 -> `IOError
+      | 3 -> `Watchdog
+      | 4 -> `Restored
+      | 5 -> `FromSnapshot
+      | 6 -> `APIError
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module Resumed = struct
+    type t = [
+      | `Unpaused
+      | `Migrated
+      | `FromSnapshot
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let to_string = function
+      | `Unpaused -> "Unpaused"
+      | `Migrated -> "Migrated"
+      | `FromSnapshot -> "FromSnapshot"
+      | `Unknown x -> Printf.sprintf "Unknown Resumed.detail: %d" x
+
+    let make = function
+      | 0 -> `Unpaused
+      | 1 -> `Migrated
+      | 2 -> `FromSnapshot
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module Stopped = struct
+    type t = [
+      | `Shutdown
+      | `Destroyed
+      | `Crashed
+      | `Migrated
+      | `Saved
+      | `Failed
+      | `FromSnapshot
+      | `Unknown of int
+    ]
+    let to_string = function
+      | `Shutdown -> "Shutdown"
+      | `Destroyed -> "Destroyed"
+      | `Crashed -> "Crashed"
+      | `Migrated -> "Migrated"
+      | `Saved -> "Saved"
+      | `Failed -> "Failed"
+      | `FromSnapshot -> "FromSnapshot"
+      | `Unknown x -> Printf.sprintf "Unknown Stopped.detail: %d" x
+
+    let make = function
+      | 0 -> `Shutdown
+      | 1 -> `Destroyed
+      | 2 -> `Crashed
+      | 3 -> `Migrated
+      | 4 -> `Saved
+      | 5 -> `Failed
+      | 6 -> `FromSnapshot
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module PM_suspended = struct
+    type t = [
+      | `Memory
+      | `Disk
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let to_string = function
+      | `Memory -> "Memory"
+      | `Disk -> "Disk"
+      | `Unknown x -> Printf.sprintf "Unknown PM_suspended.detail: %d" x
+
+    let make = function
+      | 0 -> `Memory
+      | 1 -> `Disk
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  let string_option x = match x with
+    | None -> "None"
+    | Some x' -> "Some " ^ x'
+
+  module Lifecycle = struct
+    type t = [
+      | `Defined of Defined.t
+      | `Undefined of Undefined.t
+      | `Started of Started.t
+      | `Suspended of Suspended.t
+      | `Resumed of Resumed.t
+      | `Stopped of Stopped.t
+      | `Shutdown (* no detail defined yet *)
+      | `PMSuspended of PM_suspended.t
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let to_string = function
+      | `Defined x -> "Defined " ^ (Defined.to_string x)
+      | `Undefined x -> "Undefined " ^ (Undefined.to_string x)
+      | `Started x -> "Started " ^ (Started.to_string x)
+      | `Suspended x -> "Suspended " ^ (Suspended.to_string x)
+      | `Resumed x -> "Resumed " ^ (Resumed.to_string x)
+      | `Stopped x -> "Stopped " ^ (Stopped.to_string x)
+      | `Shutdown -> "Shutdown"
+      | `PMSuspended x -> "PMSuspended " ^ (PM_suspended.to_string x)
+      | `Unknown x -> Printf.sprintf "Unknown Lifecycle event: %d" x
+
+    let make (ty, detail) = match ty with
+      | 0 -> `Defined (Defined.make detail)
+      | 1 -> `Undefined (Undefined.make detail)
+      | 2 -> `Started (Started.make detail)
+      | 3 -> `Suspended (Suspended.make detail)
+      | 4 -> `Resumed (Resumed.make detail)
+      | 5 -> `Stopped (Stopped.make detail)
+      | 6 -> `Shutdown
+      | 7 -> `PMSuspended (PM_suspended.make detail)
+      | x -> `Unknown x
+  end
+
+  module Reboot = struct
+    type t = unit
+
+    let to_string _ = "()"
+
+    let make () = ()
+  end
+
+  module Rtc_change = struct
+    type t = int64
+
+    let to_string = Int64.to_string
+
+    let make x = x
+  end
+
+  module Watchdog = struct
+    type t = [
+      | `None
+      | `Pause
+      | `Reset
+      | `Poweroff
+      | `Shutdown
+      | `Debug
+      | `Unknown of int
+    ]
+
+    let to_string = function
+      | `None -> "None"
+      | `Pause -> "Pause"
+      | `Reset -> "Reset"
+      | `Poweroff -> "Poweroff"
+      | `Shutdown -> "Shutdown"
+      | `Debug -> "Debug"
+      | `Unknown x -> Printf.sprintf "Unknown watchdog_action: %d" x
+
+    let make = function
+      | 0 -> `None
+      | 1 -> `Pause
+      | 2 -> `Reset
+      | 3 -> `Poweroff
+      | 4 -> `Shutdown
+      | 5 -> `Debug
+      | x -> `Unknown x (* newer libvirt *)
+  end
+
+  module Io_error = struct
+    type action = [
+      | `None
+      | `Pause
+      | `Report
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let string_of_action = function
+      | `None -> "None"
+      | `Pause -> "Pause"
+      | `Report -> "Report"
+      | `Unknown x -> Printf.sprintf "Unknown Io_error.action: %d" x
+
+    let action_of_int = function
+      | 0 -> `None
+      | 1 -> `Pause
+      | 2 -> `Report
+      | x -> `Unknown x
+
+    type t = {
+      src_path: string option;
+      dev_alias: string option;
+      action: action;
+      reason: string option;
+    }
+
+    let to_string t = Printf.sprintf
+        "{ Io_error.src_path = %s; dev_alias = %s; action = %s; reason = %s }"
+        (string_option t.src_path)
+        (string_option t.dev_alias)
+        (string_of_action t.action)
+        (string_option t.reason)
+
+    let make (src_path, dev_alias, action, reason) = {
+        src_path = src_path;
+        dev_alias = dev_alias;
+        action = action_of_int action;
+        reason = reason;
+    }
+
+    let make_noreason (src_path, dev_alias, action) =
+      make (src_path, dev_alias, action, None)
+  end
+
+  module Graphics_address = struct
+    type family = [
+      | `Ipv4
+      | `Ipv6
+      | `Unix
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let string_of_family = function
+      | `Ipv4 -> "IPv4"
+      | `Ipv6 -> "IPv6"
+      | `Unix -> "UNIX"
+      | `Unknown x -> Printf.sprintf "Unknown Graphics_address.family: %d" x
+
+    let family_of_int = function
+      (* no zero *)
+      | 1 -> `Ipv4
+      | 2 -> `Ipv6
+      | 3 -> `Unix
+      | x -> `Unknown x
+
+    type t = {
+      family: family;         (** Address family *)
+      node: string option;    (** Address of node (eg IP address, or UNIX path *)
+      service: string option; (** Service name/number (eg TCP port, or NULL) *)
+    }
+
+    let to_string t = Printf.sprintf
+      "{ family = %s; node = %s; service = %s }"
+        (string_of_family t.family)
+        (string_option t.node)
+        (string_option t.service)
+
+    let make (family, node, service) = {
+      family = family_of_int family;
+      node = node;
+      service = service;
+    }
+  end
+
+  module Graphics_subject = struct
+    type identity = {
+      ty: string option;
+      name: string option;
+    }
+
+    let string_of_identity t = Printf.sprintf
+      "{ ty = %s; name = %s }"
+      (string_option t.ty)
+      (string_option t.name)
+
+    type t = identity list
+
+    let to_string ts =
+      "[ " ^ (String.concat "; " (List.map string_of_identity ts)) ^ " ]"
+
+    let make xs =
+      List.map (fun (ty, name) -> { ty = ty; name = name })
+        (Array.to_list xs)
+  end
+
+  module Graphics = struct
+    type phase = [
+      | `Connect
+      | `Initialize
+      | `Disconnect
+      | `Unknown of int (** newer libvirt *)
+    ]
+
+    let string_of_phase = function
+      | `Connect -> "Connect"
+      | `Initialize -> "Initialize"
+      | `Disconnect -> "Disconnect"
+      | `Unknown x -> Printf.sprintf "Unknown Graphics.phase: %d" x
+
+    let phase_of_int = function
+      | 0 -> `Connect
+      | 1 -> `Initialize
+      | 2 -> `Disconnect
+      | x -> `Unknown x
+
+    type t = {
+      phase: phase;                (** the phase of the connection *)
+      local: Graphics_address.t;   (** the local server address *)
+      remote: Graphics_address.t;  (** the remote client address *)
+      auth_scheme: string option;  (** the authentication scheme activated *)
+      subject: Graphics_subject.t; (** the authenticated subject (user) *)
+    }
+
+    let to_string t =
+      let phase = Printf.sprintf "phase = %s"
+        (string_of_phase t.phase) in
+      let local = Printf.sprintf "local = %s"
+        (Graphics_address.to_string t.local) in
+      let remote = Printf.sprintf "remote = %s"
+        (Graphics_address.to_string t.remote) in
+      let auth_scheme = Printf.sprintf "auth_scheme = %s"
+        (string_option t.auth_scheme) in
+      let subject = Printf.sprintf "subject = %s"
+        (Graphics_subject.to_string t.subject) in
+      "{ " ^ (String.concat "; " [ phase; local; remote; auth_scheme; subject ]) ^ " }"
+
+    let make (phase, local, remote, auth_scheme, subject) = {
+      phase = phase_of_int phase;
+      local = Graphics_address.make local;
+      remote = Graphics_address.make remote;
+      auth_scheme = auth_scheme;
+      subject = Graphics_subject.make subject;
+    }
+  end
+
+  module Control_error = struct
+    type t = unit
+
+    let to_string () = "()"
+
+    let make () = ()
+  end
+
+  module Block_job = struct
+    type ty = [
+      | `KnownUnknown (* explicitly named UNKNOWN in the spec *)
+      | `Pull
+      | `Copy
+      | `Commit
+      | `Unknown of int (* newer libvirt *)
+    ]
+
+    let string_of_ty = function
+      | `KnownUnknown -> "KnownUnknown"
+      | `Pull -> "Pull"
+      | `Copy -> "Copy"
+      | `Commit -> "Commit"
+      | `Unknown x -> Printf.sprintf "Unknown Block_job.ty: %d" x
+
+    let ty_of_int = function
+      | 0 -> `KnownUnknown
+      | 1 -> `Pull
+      | 2 -> `Copy
+      | 3 -> `Commit
+      | x -> `Unknown x (* newer libvirt *)
+
+    type status = [
+      | `Completed
+      | `Failed
+      | `Cancelled
+      | `Ready
+      | `Unknown of int
+    ]
+
+    let string_of_status = function
+      | `Completed -> "Completed"
+      | `Failed -> "Failed"
+      | `Cancelled -> "Cancelled"
+      | `Ready -> "Ready"
+      | `Unknown x -> Printf.sprintf "Unknown Block_job.status: %d" x
+
+    let status_of_int = function
+      | 0 -> `Completed
+      | 1 -> `Failed
+      | 2 -> `Cancelled
+      | 3 -> `Ready
+      | x -> `Unknown x
+
+    type t = {
+      disk: string option;
+      ty: ty;
+      status: status;
+    }
+
+    let to_string t = Printf.sprintf "{ disk = %s; ty = %s; status = %s }"
+      (string_option t.disk)
+      (string_of_ty t.ty)
+      (string_of_status t.status)
+
+    let make (disk, ty, status) = {
+      disk = disk;
+      ty = ty_of_int ty;
+      status = status_of_int ty;
+    }
+  end
+
+  module Disk_change = struct
+    type reason = [
+      | `MissingOnStart
+      | `Unknown of int
+    ]
+
+    let string_of_reason = function
+      | `MissingOnStart -> "MissingOnStart"
+      | `Unknown x -> Printf.sprintf "Unknown Disk_change.reason: %d" x
+
+    let reason_of_int = function
+      | 0 -> `MissingOnStart
+      | x -> `Unknown x
+
+    type t = {
+      old_src_path: string option;
+      new_src_path: string option;
+      dev_alias: string option;
+      reason: reason;
+    }
+
+    let to_string t =
+      let o = Printf.sprintf "old_src_path = %s" (string_option t.old_src_path) in
+      let n = Printf.sprintf "new_src_path = %s" (string_option t.new_src_path) in
+      let d = Printf.sprintf "dev_alias = %s" (string_option t.dev_alias) in
+      let r = string_of_reason t.reason in
+      "{ " ^ (String.concat "; " [ o; n; d; r ]) ^ " }"
+
+    let make (o, n, d, r) = {
+      old_src_path = o;
+      new_src_path = n;
+      dev_alias = d;
+      reason = reason_of_int r;
+    }
+  end
+
+  module Tray_change = struct
+    type reason = [
+      | `Open
+      | `Close
+      | `Unknown of int
+    ]
+
+    let string_of_reason = function
+      | `Open -> "Open"
+      | `Close -> "Close"
+      | `Unknown x -> Printf.sprintf "Unknown Tray_change.reason: %d" x
+
+    let reason_of_int = function
+      | 0 -> `Open
+      | 1 -> `Close
+      | x -> `Unknown x
+
+    type t = {
+      dev_alias: string option;
+      reason: reason;
+    }
+
+    let to_string t = Printf.sprintf
+      "{ dev_alias = %s; reason = %s }"
+        (string_option t.dev_alias)
+        (string_of_reason t.reason)
+
+    let make (dev_alias, reason) = {
+      dev_alias = dev_alias;
+      reason = reason_of_int reason;
+    }
+  end
+
+  module PM_wakeup = struct
+    type reason = [
+      | `Unknown of int
+    ]
+
+    type t = reason
+
+    let to_string = function
+      | `Unknown x -> Printf.sprintf "Unknown PM_wakeup.reason: %d" x
+
+    let make x = `Unknown x
+  end
+
+  module PM_suspend = struct
+    type reason = [
+      | `Unknown of int
+    ]
+
+    type t = reason
+
+    let to_string = function
+      | `Unknown x -> Printf.sprintf "Unknown PM_suspend.reason: %d" x
+
+    let make x = `Unknown x
+  end
+
+  module Balloon_change = struct
+    type t = int64
+
+    let to_string = Int64.to_string
+    let make x = x
+  end
+
+  module PM_suspend_disk = struct
+    type reason = [
+      | `Unknown of int
+    ]
+
+    type t = reason
+
+    let to_string = function
+      | `Unknown x -> Printf.sprintf "Unknown PM_suspend_disk.reason: %d" x
+
+    let make x = `Unknown x
+  end
+
+  type callback =
+    | Lifecycle     of ([`R] Domain.t -> Lifecycle.t -> unit)
+    | Reboot        of ([`R] Domain.t -> Reboot.t -> unit)
+    | RtcChange     of ([`R] Domain.t -> Rtc_change.t -> unit)
+    | Watchdog      of ([`R] Domain.t -> Watchdog.t -> unit)
+    | IOError       of ([`R] Domain.t -> Io_error.t -> unit)
+    | Graphics      of ([`R] Domain.t -> Graphics.t -> unit)
+    | IOErrorReason of ([`R] Domain.t -> Io_error.t -> unit)
+    | ControlError  of ([`R] Domain.t -> Control_error.t -> unit)
+    | BlockJob      of ([`R] Domain.t -> Block_job.t -> unit)
+    | DiskChange    of ([`R] Domain.t -> Disk_change.t -> unit)
+    | TrayChange    of ([`R] Domain.t -> Tray_change.t -> unit)
+    | PMWakeUp      of ([`R] Domain.t -> PM_wakeup.t -> unit)
+    | PMSuspend     of ([`R] Domain.t -> PM_suspend.t -> unit)
+    | BalloonChange of ([`R] Domain.t -> Balloon_change.t -> unit)
+    | PMSuspendDisk of ([`R] Domain.t -> PM_suspend_disk.t -> unit)
+
+  type callback_id = int64
+
+  let fresh_callback_id =
+    let next = ref 0L in
+    fun () ->
+      let result = !next in
+      next := Int64.succ !next;
+      result
+
+  let make_table value_name =
+    let table = Hashtbl.create 16 in
+    let callback callback_id generic x =
+      if Hashtbl.mem table callback_id
+      then Hashtbl.find table callback_id generic x in
+    let _ = Callback.register value_name callback in
+    table
+
+  let u_table = make_table "Libvirt.u_callback"
+  let i_table = make_table "Libvirt.i_callback"
+  let i64_table = make_table "Libvirt.i64_callback"
+  let i_i_table = make_table "Libvirt.i_i_callback"
+  let s_i_table = make_table "Libvirt.s_i_callback"
+  let s_i_i_table = make_table "Libvirt.s_i_i_callback"
+  let s_s_i_table = make_table "Libvirt.s_s_i_callback"
+  let s_s_i_s_table = make_table "Libvirt.s_s_i_s_callback"
+  let s_s_s_i_table = make_table "Libvirt.s_s_s_i_callback"
+  let i_ga_ga_s_gs_table = make_table "Libvirt.i_ga_ga_s_gs_callback"
+
+  external register_default_impl : unit -> unit = "ocaml_libvirt_event_register_default_impl"
+
+  external run_default_impl : unit -> unit = "ocaml_libvirt_event_run_default_impl"
+
+  external register_any' : 'a Connect.t -> 'a Domain.t option -> callback -> callback_id -> int = "ocaml_libvirt_connect_domain_event_register_any"
+
+  external deregister_any' : 'a Connect.t -> int -> unit = "ocaml_libvirt_connect_domain_event_deregister_any"
+
+  let our_id_to_libvirt_id = Hashtbl.create 16
+
+  let register_any conn ?dom callback =
+    let id = fresh_callback_id () in
+    begin match callback with
+    | Lifecycle f ->
+        Hashtbl.add i_i_table id (fun dom x ->
+            f dom (Lifecycle.make x)
+        )
+    | Reboot f ->
+        Hashtbl.add u_table id (fun dom x ->
+            f dom (Reboot.make x)
+        )
+    | RtcChange f ->
+        Hashtbl.add i64_table id (fun dom x ->
+            f dom (Rtc_change.make x)
+        )
+    | Watchdog f ->
+        Hashtbl.add i_table id (fun dom x ->
+            f dom (Watchdog.make x)
+        ) 
+    | IOError f ->
+        Hashtbl.add s_s_i_table id (fun dom x ->
+            f dom (Io_error.make_noreason x)
+        )
+    | Graphics f ->
+        Hashtbl.add i_ga_ga_s_gs_table id (fun dom x ->
+            f dom (Graphics.make x)
+        )
+    | IOErrorReason f ->
+        Hashtbl.add s_s_i_s_table id (fun dom x ->
+            f dom (Io_error.make x)
+        )
+    | ControlError f ->
+        Hashtbl.add u_table id (fun dom x ->
+            f dom (Control_error.make x)
+        )
+    | BlockJob f ->
+        Hashtbl.add s_i_i_table id (fun dom x ->
+            f dom (Block_job.make x)
+        )
+    | DiskChange f ->
+        Hashtbl.add s_s_s_i_table id (fun dom x ->
+            f dom (Disk_change.make x)
+        )
+    | TrayChange f ->
+        Hashtbl.add s_i_table id (fun dom x ->
+            f dom (Tray_change.make x)
+        )
+    | PMWakeUp f ->
+        Hashtbl.add i_table id (fun dom x ->
+            f dom (PM_wakeup.make x)
+        )
+    | PMSuspend f ->
+        Hashtbl.add i_table id (fun dom x ->
+            f dom (PM_suspend.make x)
+        )
+    | BalloonChange f ->
+        Hashtbl.add i64_table id (fun dom x ->
+            f dom (Balloon_change.make x)
+        )
+    | PMSuspendDisk f ->
+        Hashtbl.add i_table id (fun dom x ->
+            f dom (PM_suspend_disk.make x)
+        )
+    end;
+    let libvirt_id = register_any' conn dom callback id in
+    Hashtbl.replace our_id_to_libvirt_id id libvirt_id;
+    id
+
+  let deregister_any conn id =
+    if Hashtbl.mem our_id_to_libvirt_id id then begin
+      let libvirt_id = Hashtbl.find our_id_to_libvirt_id id in
+      deregister_any' conn libvirt_id
+    end;
+    Hashtbl.remove our_id_to_libvirt_id id;
+    Hashtbl.remove u_table id;
+    Hashtbl.remove i_table id;
+    Hashtbl.remove i64_table id;
+    Hashtbl.remove i_i_table id;
+    Hashtbl.remove s_i_table id;
+    Hashtbl.remove s_i_i_table id;
+    Hashtbl.remove s_s_i_table id;
+    Hashtbl.remove s_s_i_s_table id;
+    Hashtbl.remove s_s_s_i_table id;
+    Hashtbl.remove i_ga_ga_s_gs_table id
+
+  let timeout_table = Hashtbl.create 16
+  let _ =
+    let callback x =
+      if Hashtbl.mem timeout_table x
+      then Hashtbl.find timeout_table x () in
+  Callback.register "Libvirt.timeout_callback" callback
+
+  type timer_id = int64
+
+  external add_timeout' : 'a Connect.t -> int -> int64 -> int = "ocaml_libvirt_event_add_timeout"
+
+  external remove_timeout' : 'a Connect.t -> int -> unit = "ocaml_libvirt_event_remove_timeout"
+
+  let our_id_to_timer_id = Hashtbl.create 16
+  let add_timeout conn ms fn =
+    let id = fresh_callback_id () in
+    Hashtbl.add timeout_table id fn;
+    let timer_id = add_timeout' conn ms id in
+    Hashtbl.add our_id_to_timer_id id timer_id;
+    id
+
+  let remove_timeout conn id =
+    if Hashtbl.mem our_id_to_timer_id id then begin
+      let timer_id = Hashtbl.find our_id_to_timer_id id in
+      remove_timeout' conn timer_id
+    end;
+    Hashtbl.remove our_id_to_timer_id id;
+    Hashtbl.remove timeout_table id
+end
+
 module Network =
 struct
   type 'rw t
diff --git a/libvirt/libvirt.mli b/libvirt/libvirt.mli
index fa5a0fe..36cd113 100644
--- a/libvirt/libvirt.mli
+++ b/libvirt/libvirt.mli
@@ -638,6 +638,361 @@ end
   (** Module dealing with domains.  [Domain.t] is the
       domain object. *)
 
+module Event :
+sig
+
+  module Defined : sig
+    type t = [
+      | `Added          (** Newly created config file *)
+      | `Updated        (** Changed config file *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Undefined : sig
+    type t = [
+      | `Removed        (** Deleted the config file *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Started : sig
+    type t = [
+      | `Booted         (** Normal startup from boot *)
+      | `Migrated       (** Incoming migration from another host *)
+      | `Restored       (** Restored from a state file *)
+      | `FromSnapshot   (** Restored from snapshot *)
+      | `Wakeup         (** Started due to wakeup event *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Suspended : sig
+    type t = [
+      | `Paused        (** Normal suspend due to admin pause *)
+      | `Migrated      (** Suspended for offline migration *)
+      | `IOError       (** Suspended due to a disk I/O error *)
+      | `Watchdog      (** Suspended due to a watchdog firing *)
+      | `Restored      (** Restored from paused state file *)
+      | `FromSnapshot  (** Restored from paused snapshot *)
+      | `APIError      (** suspended after failure during libvirt API call *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Resumed : sig
+    type t = [
+      | `Unpaused      (** Normal resume due to admin unpause *)
+      | `Migrated      (** Resumed for completion of migration *)
+      | `FromSnapshot  (** Resumed from snapshot *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Stopped : sig
+    type t = [
+      | `Shutdown     (** Normal shutdown *)
+      | `Destroyed    (** Forced poweroff from host *)
+      | `Crashed      (** Guest crashed *)
+      | `Migrated     (** Migrated off to another host *)
+      | `Saved        (** Saved to a state file *)
+      | `Failed       (** Host emulator/mgmt failed *)
+      | `FromSnapshot (** offline snapshot loaded *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module PM_suspended : sig
+    type t = [
+      | `Memory       (** Guest was PM suspended to memory *)
+      | `Disk         (** Guest was PM suspended to disk *)
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Lifecycle : sig
+    type t = [
+      | `Defined of Defined.t
+      | `Undefined of Undefined.t
+      | `Started of Started.t
+      | `Suspended of Suspended.t
+      | `Resumed of Resumed.t
+      | `Stopped of Stopped.t
+      | `Shutdown (* no detail defined yet *)
+      | `PMSuspended of PM_suspended.t
+      | `Unknown of int
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Reboot : sig
+    type t = unit
+
+    val to_string: t -> string
+  end
+
+  module Rtc_change : sig
+    type t = int64
+
+    val to_string: t -> string
+  end
+
+  module Watchdog : sig
+    type t = [
+      | `None           (** No action, watchdog ignored *)
+      | `Pause          (** Guest CPUs are paused *)
+      | `Reset          (** Guest CPUs are reset *)
+      | `Poweroff       (** Guest is forcably powered off *)
+      | `Shutdown       (** Guest is requested to gracefully shutdown *)
+      | `Debug          (** No action, a debug message logged *)
+      | `Unknown of int (** newer libvirt *)
+    ]
+
+    val to_string: t -> string
+  end
+
+  module Io_error : sig
+    (** Represents both IOError and IOErrorReason *)
+    type action = [
+      | `None           (** No action, IO error ignored *)
+      | `Pause          (** Guest CPUs are paused *)
+      | `Report         (** IO error reported to guest OS *)
+      | `Unknown of int (** newer libvirt *)
+    ]
+
+    type t = {
+      src_path: string option;  (** The host file on which the I/O error occurred *)
+      dev_alias: string option; (** The guest device alias associated with the path *)
+      action: action;    (** The action that is to be taken due to the IO error *)
+      reason: string option;    (** The cause of the IO error *)
+    }
+
+    val to_string: t -> string
+  end
+
+  module Graphics_address : sig
+    type family = [
+      | `Ipv4           (** IPv4 address *)
+      | `Ipv6           (** IPv6 address *)
+      | `Unix           (** UNIX socket path *)
+      | `Unknown of int (** newer libvirt *)
+    ]
+
+    type t = {
+      family: family;         (** Address family *)
+      node: string option;    (** Address of node (eg IP address, or UNIX path *)
+      service: string option; (** Service name/number (eg TCP port, or NULL) *)
+    }
+
+    val to_string: t -> string
+  end
+
+  module Graphics_subject : sig
+    type identity = {
+      ty: string option;   (** Type of identity *)
+      name: string option; (** Identity value *)
+    }
+
+    type t = identity list
+
+    val to_string: t -> string
+  end
+
+  module Graphics : sig
+    type phase = [
+      | `Connect        (** Initial socket connection established *)
+      | `Initialize     (** Authentication & setup completed *)
+      | `Disconnect     (** Final socket disconnection *)
+      | `Unknown of int (** newer libvirt *)
+    ]
+
+    type t = {
+      phase: phase;                (** the phase of the connection *)
+      local: Graphics_address.t;   (** the local server address *)
+      remote: Graphics_address.t;  (** the remote client address *)
+      auth_scheme: string option;  (** the authentication scheme activated *)
+      subject: Graphics_subject.t; (** the authenticated subject (user) *)
+    }
+
+    val to_string: t -> string
+  end
+
+  module Control_error : sig
+    type t = unit
+
+    val to_string: t -> string
+  end
+
+  module Block_job : sig
+    type ty = [
+      | `KnownUnknown (** explicitly named UNKNOWN in the spec *)
+      | `Pull
+      | `Copy
+      | `Commit
+      | `Unknown of int
+    ]
+
+    type status = [
+      | `Completed
+      | `Failed
+      | `Cancelled
+      | `Ready
+      | `Unknown of int
+    ]
+
+    type t = {
+      disk: string option; (** fully-qualified name of the affected disk *)	
+      ty: ty;              (** type of block job *)
+      status: status;      (** final status of the operation *)
+    }
+
+    val to_string: t -> string
+  end
+
+  module Disk_change : sig
+    type reason = [
+      | `MissingOnStart
+      | `Unknown of int
+    ]
+
+    type t = {
+      old_src_path: string option; (** old source path *)
+      new_src_path: string option; (** new source path *)
+      dev_alias: string option;    (** device alias name *)
+      reason: reason;              (** reason why this callback was called *)
+    }
+
+    val to_string: t -> string
+  end
+
+  module Tray_change : sig
+    type reason = [
+      | `Open
+      | `Close
+      | `Unknown of int
+    ]
+
+    type t = {
+      dev_alias: string option; (** device alias *)
+      reason: reason;           (** why the tray status was changed *)
+    }
+
+    val to_string: t -> string
+  end
+
+  module PM_wakeup : sig
+    type reason = [
+      | `Unknown of int
+    ]
+
+    type t = reason
+
+    val to_string: t -> string
+  end
+
+  module PM_suspend : sig
+    type reason = [
+      | `Unknown of int
+    ]
+
+    type t = reason
+
+    val to_string: t -> string
+  end
+
+  module Balloon_change : sig
+    type t = int64
+
+    val to_string: t -> string
+  end
+
+  module PM_suspend_disk : sig
+    type reason = [
+      | `Unknown of int
+    ]
+
+    type t = reason
+
+    val to_string: t -> string
+  end
+
+
+  type callback =
+    | Lifecycle     of ([`R] Domain.t -> Lifecycle.t -> unit)
+    | Reboot        of ([`R] Domain.t -> Reboot.t -> unit)
+    | RtcChange     of ([`R] Domain.t -> Rtc_change.t -> unit)
+    | Watchdog      of ([`R] Domain.t -> Watchdog.t -> unit)
+    | IOError       of ([`R] Domain.t -> Io_error.t -> unit)
+    | Graphics      of ([`R] Domain.t -> Graphics.t -> unit)
+    | IOErrorReason of ([`R] Domain.t -> Io_error.t -> unit)
+    | ControlError  of ([`R] Domain.t -> Control_error.t -> unit)
+    | BlockJob      of ([`R] Domain.t -> Block_job.t -> unit)
+    | DiskChange    of ([`R] Domain.t -> Disk_change.t -> unit)
+    | TrayChange    of ([`R] Domain.t -> Tray_change.t -> unit)
+    | PMWakeUp      of ([`R] Domain.t -> PM_wakeup.t -> unit)
+    | PMSuspend     of ([`R] Domain.t -> PM_suspend.t -> unit)
+    | BalloonChange of ([`R] Domain.t -> Balloon_change.t -> unit)
+    | PMSuspendDisk of ([`R] Domain.t -> PM_suspend_disk.t -> unit)
+
+    (** type of a registered call back function *)
+
+  val register_default_impl : unit -> unit
+    (** Registers the default event loop based on poll(). This
+        must be done before connections are opened.
+
+        Once registered call run_default_impl in a loop. *)
+
+  val run_default_impl : unit -> unit
+    (** Runs one iteration of the event loop. Applications will
+        generally want to have a thread which invokes this in an
+        infinite loop. *)
+
+  type callback_id
+    (** an individual event registration *)
+
+  val register_any : 'a Connect.t -> ?dom:'a Domain.t -> callback -> callback_id
+    (** [register_any con ?dom callback] registers [callback]
+        to receive notification of arbitrary domain events. Return
+        a registration id which can be used in [deregister_any].
+
+        If [?dom] is None then register for this kind of event on
+        all domains. If [dom] is [Some d] then register for this
+        kind of event only on [d].
+    *)
+
+  val deregister_any : 'a Connect.t -> callback_id -> unit
+    (** [deregister_any con id] deregisters the previously registered
+        callback with id [id]. *)
+
+  type timer_id
+    (** an individual timer event *)
+
+  val add_timeout : 'a Connect.t -> int -> (unit -> unit) -> timer_id
+    (** [add_timeout con ms cb] registers [cb] as a timeout callback
+        which will be called every [ms] milliseconds *)
+
+  val remove_timeout : 'a Connect.t -> timer_id -> unit
+    (** [remove_timeout con t] deregisters timeout callback [t]. *)
+
+end
+  (** Module dealing with events generated by domain
+      state changes. *)
+
 (** {3 Networks} *)
 
 module Network : 
diff --git a/libvirt/libvirt_c.c b/libvirt/libvirt_c.c
index 00dbbbc..71e6f61 100644
--- a/libvirt/libvirt_c.c
+++ b/libvirt/libvirt_c.c
@@ -484,6 +484,25 @@ ocaml_libvirt_connect_get_capabilities (value connv)
   CAMLreturn (rv);
 }
 
+/* Automatically generated binding for virConnectDomainEventDeregisterAny.
+ * In generator.pl this function has signature "conn, int : unit".
+ */
+
+CAMLprim value
+ocaml_libvirt_connect_domain_event_deregister_any (value connv, value iv)
+{
+  CAMLparam2 (connv, iv);
+
+  virConnectPtr conn = Connect_val (connv);
+  int i = Int_val (iv);
+  int r;
+
+  NONBLOCKING (r = virConnectDomainEventDeregisterAny (conn, i));
+  CHECK_ERROR (r == -1, conn, "virConnectDomainEventDeregisterAny");
+
+  CAMLreturn (Val_unit);
+}
+
 /* Automatically generated binding for virDomainCreateLinux.
  * In generator.pl this function has signature "conn, string, 0U : dom".
  */
diff --git a/libvirt/libvirt_c_oneoffs.c b/libvirt/libvirt_c_oneoffs.c
index c51aad7..3bb572f 100644
--- a/libvirt/libvirt_c_oneoffs.c
+++ b/libvirt/libvirt_c_oneoffs.c
@@ -740,6 +740,417 @@ ocaml_libvirt_domain_memory_peek_bytecode (value *argv, int argn)
                                                   argv[3], argv[4], argv[5]);
 }
 
+/*----------------------------------------------------------------------*/
+
+/* Domain events */
+
+CAMLprim value
+ocaml_libvirt_event_register_default_impl (value unitv)
+{
+  CAMLparam1 (unitv);
+
+  /* arg is of type unit = void */
+  int r;
+
+  NONBLOCKING (r = virEventRegisterDefaultImpl ());
+  /* must be called before connection, therefore we can't use CHECK_ERROR */
+  if (r == -1) caml_failwith("virEventRegisterDefaultImpl");
+
+  CAMLreturn (Val_unit);
+}
+
+CAMLprim value
+ocaml_libvirt_event_run_default_impl (value unitv)
+{
+  CAMLparam1 (unitv);
+
+  /* arg is of type unit = void */
+  int r;
+
+  NONBLOCKING (r = virEventRunDefaultImpl ());
+  if (r == -1) caml_failwith("virEventRunDefaultImpl");
+
+  CAMLreturn (Val_unit);
+}
+
+/* We register a single C callback function for every distinct
+   callback signature. We encode the signature itself in the function
+   name and also in the name of the assocated OCaml callback
+   e.g.:
+      a C function called
+         i_i64_s_callback(virConnectPtr conn,
+			  virDomainPtr dom,
+			  int x,
+			  long y,
+			  char *z,
+			  void *opaque)
+      would correspond to an OCaml callback
+         Libvirt.i_i64_s_callback :
+	   int64 -> [`R] Domain.t -> int -> int64 -> string option -> unit
+      where the initial int64 is a unique ID used by the OCaml to
+      dispatch to the specific OCaml closure and stored by libvirt
+      as the "opaque" data. */
+
+/* Every one of the callbacks starts with a DOMAIN_CALLBACK_BEGIN(NAME)
+   where NAME is the string name of the OCaml callback registered
+   in libvirt.ml. */
+#define DOMAIN_CALLBACK_BEGIN(NAME)                              \
+  value connv, domv, callback_id, result;                        \
+  connv = domv = callback_id = result = Val_int(0);              \
+  static value *callback = NULL;                                 \
+  caml_leave_blocking_section();                                 \
+  if (callback == NULL)                                          \
+    callback = caml_named_value(NAME);                           \
+  if (callback == NULL)                                          \
+    abort(); /* C code out of sync with OCaml code */            \
+  if ((virDomainRef(dom) == -1) || (virConnectRef(conn) == -1))  \
+    abort(); /* should never happen in practice? */              \
+                                                                 \
+  Begin_roots4(connv, domv, callback_id, result);                \
+  connv = Val_connect(conn);                                     \
+  domv = Val_domain(dom, connv);                                 \
+  callback_id = caml_copy_int64(*(long *)opaque);
+
+/* Every one of the callbacks ends with a CALLBACK_END */
+#define DOMAIN_CALLBACK_END                                      \
+  (void) caml_callback3(*callback, callback_id, domv, result);   \
+  End_roots();                                                   \
+  caml_enter_blocking_section();
+
+
+static void
+i_i_callback(virConnectPtr conn,
+	     virDomainPtr dom,
+	     int x,
+	     int y,
+	     void * opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.i_i_callback")
+  result = caml_alloc_tuple(2);
+  Store_field(result, 0, Val_int(x));
+  Store_field(result, 1, Val_int(y));
+  DOMAIN_CALLBACK_END
+}
+
+static void
+u_callback(virConnectPtr conn,
+	   virDomainPtr dom,
+	   void *opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.u_callback")
+  result = Val_int(0); /* () */
+  DOMAIN_CALLBACK_END
+}
+
+static void
+i64_callback(virConnectPtr conn,
+	     virDomainPtr dom,
+	     long long int64,
+	     void *opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.i64_callback")
+  result = caml_copy_int64(int64);
+  DOMAIN_CALLBACK_END
+}
+
+static void
+i_callback(virConnectPtr conn,
+	   virDomainPtr dom,
+	   int x,
+	   void *opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.i_callback")
+  result = Val_int(x);
+  DOMAIN_CALLBACK_END
+}
+
+static void
+s_i_callback(virConnectPtr conn,
+	     virDomainPtr dom,
+	     char *x,
+	     int y,
+	     void * opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.s_i_callback")
+  result = caml_alloc_tuple(2);
+  Store_field(result, 0, 
+	      Val_opt(x, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 1, Val_int(y));
+  DOMAIN_CALLBACK_END
+}
+
+static void
+s_i_i_callback(virConnectPtr conn,
+	       virDomainPtr dom,
+	       char *x,
+	       int y,
+	       int z,
+	       void * opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.s_i_i_callback")
+  result = caml_alloc_tuple(3);
+  Store_field(result, 0, 
+	      Val_opt(x, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 1, Val_int(y));
+  Store_field(result, 2, Val_int(z));
+  DOMAIN_CALLBACK_END
+}
+
+static void
+s_s_i_callback(virConnectPtr conn,
+	       virDomainPtr dom,
+	       char *x,
+	       char *y,
+	       int z,
+	       void *opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.s_s_i_callback")
+  result = caml_alloc_tuple(3);
+  Store_field(result, 0, 
+	      Val_opt(x, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 1,
+	      Val_opt(y, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 2, Val_int(z));
+  DOMAIN_CALLBACK_END
+}
+
+static void
+s_s_i_s_callback(virConnectPtr conn,
+		 virDomainPtr dom,
+		 char *x,
+		 char *y,
+		 int z,
+		 char *a,
+		 void *opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.s_s_i_s_callback")
+  result = caml_alloc_tuple(4);
+  Store_field(result, 0, 
+	      Val_opt(x, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 1,
+	      Val_opt(y, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 2, Val_int(z));
+  Store_field(result, 3,
+	      Val_opt(a, (Val_ptr_t) caml_copy_string));
+  DOMAIN_CALLBACK_END
+}
+
+static void
+s_s_s_i_callback(virConnectPtr conn,
+		 virDomainPtr dom,
+		 char * x,
+		 char * y,
+		 char * z,
+		 int a,
+		 void * opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.s_s_s_i_callback")
+  result = caml_alloc_tuple(4);
+  Store_field(result, 0,
+	      Val_opt(x, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 1,
+              Val_opt(y, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 2,
+              Val_opt(z, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 3, Val_int(a));
+  DOMAIN_CALLBACK_END
+}
+
+static value
+Val_event_graphics_address(virDomainEventGraphicsAddressPtr x)
+{
+  CAMLparam0 ();
+  CAMLlocal1(result);
+  result = caml_alloc_tuple(3);
+  Store_field(result, 0, Val_int(x->family));
+  Store_field(result, 1,
+	      Val_opt((void *) x->node, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 2,
+	      Val_opt((void *) x->service, (Val_ptr_t) caml_copy_string));
+  CAMLreturn(result);
+}
+
+static value
+Val_event_graphics_subject_identity(virDomainEventGraphicsSubjectIdentityPtr x)
+{
+  CAMLparam0 ();
+  CAMLlocal1(result);
+  result = caml_alloc_tuple(2);
+  Store_field(result, 0,
+	      Val_opt((void *) x->type, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 1,
+	      Val_opt((void *) x->name, (Val_ptr_t) caml_copy_string));
+  CAMLreturn(result);
+
+}
+
+static value
+Val_event_graphics_subject(virDomainEventGraphicsSubjectPtr x)
+{
+  CAMLparam0 ();
+  CAMLlocal1(result);
+  int i;
+  result = caml_alloc_tuple(x->nidentity);
+  for (i = 0; i < x->nidentity; i++ )
+    Store_field(result, i,
+		Val_event_graphics_subject_identity(x->identities + i));
+  CAMLreturn(result);
+}
+
+static void
+i_ga_ga_s_gs_callback(virConnectPtr conn,
+		      virDomainPtr dom,
+		      int i1,
+		      virDomainEventGraphicsAddressPtr ga1,
+		      virDomainEventGraphicsAddressPtr ga2,
+		      char *s1,
+		      virDomainEventGraphicsSubjectPtr gs1,
+		      void * opaque)
+{
+  DOMAIN_CALLBACK_BEGIN("Libvirt.i_ga_ga_s_gs_callback")
+  result = caml_alloc_tuple(5);
+  Store_field(result, 0, Val_int(i1));
+  Store_field(result, 1, Val_event_graphics_address(ga1));
+  Store_field(result, 2, Val_event_graphics_address(ga2)); 
+  Store_field(result, 3,
+	      Val_opt(s1, (Val_ptr_t) caml_copy_string));
+  Store_field(result, 4, Val_event_graphics_subject(gs1));
+  DOMAIN_CALLBACK_END
+}
+
+static void
+timeout_callback(int timer, void *opaque)
+{
+  value callback_id, result;
+  callback_id = result = Val_int(0);
+  static value *callback = NULL;
+  caml_leave_blocking_section();
+  if (callback == NULL)
+    callback = caml_named_value("Libvirt.timeout_callback");
+  if (callback == NULL)
+    abort(); /* C code out of sync with OCaml code */
+
+  Begin_roots2(callback_id, result);
+  callback_id = caml_copy_int64(*(long *)opaque);
+
+  (void)caml_callback_exn(*callback, callback_id);
+  End_roots();
+  caml_enter_blocking_section();
+}
+
+CAMLprim value
+ocaml_libvirt_event_add_timeout (value connv, value ms, value callback_id)
+{
+  CAMLparam3 (connv, ms, callback_id);
+  virConnectPtr conn = Connect_val (connv);
+  void *opaque;
+  virFreeCallback freecb = free;
+  virEventTimeoutCallback cb = timeout_callback;
+
+  int r;
+
+  /* Store the int64 callback_id as the opaque data so the OCaml
+     callback can demultiplex to the correct OCaml handler. */
+  if ((opaque = malloc(sizeof(long))) == NULL)
+    caml_failwith ("virEventAddTimeout: malloc");
+  *((long*)opaque) = Int64_val(callback_id);
+  NONBLOCKING(r = virEventAddTimeout(Int_val(ms), cb, opaque, freecb));
+  CHECK_ERROR(r == -1, conn, "virEventAddTimeout");
+
+  CAMLreturn(Val_int(r));
+}
+
+CAMLprim value
+ocaml_libvirt_event_remove_timeout (value connv, value timer_id)
+{
+  CAMLparam2 (connv, timer_id);
+  virConnectPtr conn = Connect_val (connv);
+  int r;
+
+  NONBLOCKING(r = virEventRemoveTimeout(Int_val(timer_id)));
+  CHECK_ERROR(r == -1, conn, "virEventRemoveTimeout");
+
+  CAMLreturn(Val_int(r));
+}
+
+CAMLprim value
+ocaml_libvirt_connect_domain_event_register_any(value connv, value domv, value callback, value callback_id)
+{
+  CAMLparam4(connv, domv, callback, callback_id);
+
+  virConnectPtr conn = Connect_val (connv);
+  virDomainPtr dom = NULL;
+  int eventID = Tag_val(callback);
+
+  virConnectDomainEventGenericCallback cb;
+  void *opaque;
+  virFreeCallback freecb = free;
+  int r;
+
+  if (domv != Val_int(0))
+    dom = Domain_val (Field(domv, 0));
+
+  switch (eventID){
+  case VIR_DOMAIN_EVENT_ID_LIFECYCLE:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i_i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_REBOOT:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(u_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_RTC_CHANGE:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i64_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_WATCHDOG:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_IO_ERROR:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(s_s_i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_GRAPHICS:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i_ga_ga_s_gs_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_IO_ERROR_REASON:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(s_s_i_s_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_CONTROL_ERROR:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(u_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_BLOCK_JOB:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(s_i_i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_DISK_CHANGE:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(s_s_s_i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_TRAY_CHANGE:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(s_i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_PMWAKEUP:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_PMSUSPEND:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i64_callback);
+    break;
+  case VIR_DOMAIN_EVENT_ID_PMSUSPEND_DISK:
+    cb = VIR_DOMAIN_EVENT_CALLBACK(i_callback);
+    break;
+  default:
+    caml_failwith("vifConnectDomainEventRegisterAny: unimplemented eventID");
+  }
+
+  /* Store the int64 callback_id as the opaque data so the OCaml
+     callback can demultiplex to the correct OCaml handler. */
+  if ((opaque = malloc(sizeof(long))) == NULL)
+    caml_failwith ("virConnectDomainEventRegisterAny: malloc");
+  *((long*)opaque) = Int64_val(callback_id);
+  NONBLOCKING(r = virConnectDomainEventRegisterAny(conn, dom, eventID, cb, opaque, freecb));
+  CHECK_ERROR(r == -1, conn, "virConnectDomainEventRegisterAny");
+
+  CAMLreturn(Val_int(r));
+}
+
 CAMLprim value
 ocaml_libvirt_storage_pool_get_info (value poolv)
 {
-- 
1.8.1.2


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