[Xen-devel] [PATCH v2 1/5] libxl: introduce libxl__device_model_xs_path

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Introduce this helper to return xenstore path for device model to avoid
handcoded paths.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 tools/libxl/libxl_internal.c | 22 ++++++++++++++++++++++
 tools/libxl/libxl_internal.h |  3 +++
 2 files changed, 25 insertions(+)

diff --git a/tools/libxl/libxl_internal.c b/tools/libxl/libxl_internal.c
index ddc68ab..8877288 100644
--- a/tools/libxl/libxl_internal.c
+++ b/tools/libxl/libxl_internal.c
@@ -555,6 +555,28 @@ void libxl__update_domain_configuration(libxl__gc *gc,
     dst->b_info.video_memkb = src->b_info.video_memkb;
 }
 
+char *libxl__device_model_xs_path(libxl__gc *gc, uint32_t dm_domid,
+                                  uint32_t domid, const char *format,  ...)
+{
+    char *s, *fmt;
+    va_list ap;
+    int ret;
+
+    fmt = GCSPRINTF("/local/domain/%u/device-model/%u%s", dm_domid,
+                    domid, format);
+
+    va_start(ap, format);
+    ret = vsnprintf(NULL, 0, fmt, ap);
+    va_end(ap);
+
+    s = libxl__zalloc(gc, ret + 1);
+    va_start(ap, format);
+    ret = vsnprintf(s, ret + 1, fmt, ap);
+    va_end(ap);
+
+    return s;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 934465a..9ef2ec6 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -1794,6 +1794,9 @@ _hidden libxl__json_object *libxl__json_parse(libxl__gc 
*gc_opt, const char *s);
 _hidden int libxl__device_model_version_running(libxl__gc *gc, uint32_t domid);
   /* Return the system-wide default device model */
 _hidden libxl_device_model_version libxl__default_device_model(libxl__gc *gc);
+_hidden char *libxl__device_model_xs_path(libxl__gc *gc, uint32_t dm_domid,
+                                          uint32_t domid,
+                                          const char *format,  ...);
 
 /* Check how executes hotplug script currently */
 int libxl__hotplug_settings(libxl__gc *gc, xs_transaction_t t);
-- 
1.9.1


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