generator: Introduce error code (errcode) concept.

[libguestfs.git] / generator / generator_xdr.ml

diff --git a/generator/generator_xdr.ml b/generator/generator_xdr.ml
index 4942149..5714c80 100644 (file)
--- a/generator/generator_xdr.ml
+++ b/generator/generator_xdr.ml
@@ -65,12 +65,14 @@ let generate_xdr () =
 
   List.iter (
     fun (shortname, (ret, args, optargs), _, _, _, _, _) ->
-      if optargs <> [] then
-        failwithf "optional arguments not supported in XDR yet";
-
       let name = "guestfs_" ^ shortname in
 
-      (match args with
+      (* Ordinary arguments and optional arguments are concatenated
+       * together in the XDR args struct.  The optargs_bitmask field
+       * in the header controls which optional arguments are
+       * meaningful.
+       *)
+      (match args @ optargs with
        | [] -> ()
        | args ->
            pr "struct %s_args {\n" name;
@@ -86,6 +88,7 @@ let generate_xdr () =
              | BufferIn n ->
                  pr "  opaque %s<>;\n" n
              | FileIn _ | FileOut _ -> ()
+             | Pointer _ -> assert false
            ) args;
            pr "};\n\n"
       );
@@ -157,7 +160,7 @@ let generate_xdr () =
  */
 
 const GUESTFS_PROGRAM = 0x2000F5F5;
-const GUESTFS_PROTOCOL_VERSION = 2;
+const GUESTFS_PROTOCOL_VERSION = 4;
 
 /* These constants must be larger than any possible message length. */
 const GUESTFS_LAUNCH_FLAG = 0xf5f55ff5;
@@ -181,7 +184,8 @@ enum guestfs_message_status {
 
   pr "\
 struct guestfs_message_error {
-  int linux_errno;                   /* Linux errno if available. */
+  string errno_string<32>;           /* errno eg. \"EINVAL\", empty string
+                                        if errno not available */
   string error_message<GUESTFS_ERROR_LEN>;
 };
 
@@ -191,6 +195,8 @@ struct guestfs_message_header {
   guestfs_procedure proc;            /* GUESTFS_PROC_x */
   guestfs_message_direction direction;
   unsigned serial;                   /* message serial number */
+  unsigned hyper progress_hint;      /* upload hint for progress bar */
+  unsigned hyper optargs_bitmask;    /* bitmask for optional args */
   guestfs_message_status status;
 };