[Xen-devel] [RFC 3/4] libxl_qmp: Implement query-status command

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

It check via QMP if QEMU as reach the intended status.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 tools/libxl/libxl_internal.h |  3 +++
 tools/libxl/libxl_qmp.c      | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 8dd63319fc..d5e98114d6 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1856,6 +1856,9 @@ _hidden int libxl__qmp_nbd_server_stop(libxl__gc *gc, int 
domid);
 _hidden int libxl__qmp_x_blockdev_change(libxl__gc *gc, int domid,
                                          const char *parant,
                                          const char *child, const char *node);
+_hidden int libxl__qmp_query_status(libxl__gc *gc,
+                                    int domid,
+                                    const char *intended_status);
 /* run a hmp command in qmp mode */
 _hidden int libxl__qmp_hmp(libxl__gc *gc, int domid, const char *command_line,
                            char **out);
diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index 7b69d6a4de..9f4ba12ff0 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -1209,6 +1209,45 @@ int libxl__qmp_x_blockdev_change(libxl__gc *gc, int 
domid, const char *parent,
     return qmp_run_command(gc, domid, "x-blockdev-change", args, NULL, NULL);
 }
 
+static int qmp_check_status(libxl__qmp_handler *qmp,
+                            const libxl__json_object *response,
+                            void *opaque)
+{
+    char **status = opaque;
+    GC_INIT(qmp->ctx);
+    const libxl__json_object *o;
+
+    o = libxl__json_map_get("status", response, JSON_STRING);
+    if (!o)
+        return 1;
+    *status = libxl__strdup(gc, libxl__json_object_get_string(o));
+    return 0;
+}
+
+int libxl__qmp_query_status(libxl__gc *gc,
+                            int domid,
+                            const char *intended_status)
+{
+    char *status = NULL;
+    int rc;
+
+    rc = qmp_run_command(gc, domid, "query-status", NULL,
+                         qmp_check_status, &status);
+    if (rc < 0)
+        return rc;
+    if (rc == 1)
+        /* QMP command returned unexpected result */
+        return ERROR_FAIL;
+
+    LOGD(DEBUG, domid, "query-status result: %s", status);
+    if (!strcmp(intended_status, status))
+        /* success and ready */
+        return 0;
+
+    /* command success, status != intended_status */
+    return ERROR_NOT_READY;
+}
+
 static int hmp_callback(libxl__qmp_handler *qmp,
                         const libxl__json_object *response,
                         void *opaque)
-- 
Anthony PERARD


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