uuid: Add module for UUID generation

This commit allow modules of afb-daemon to request UUID.

This introduce an abstraction above libuuid for 3 reasons:

 1. Using uuid had bad side effect inthe past because it
    required enought entropy at start time, leading to hanging
    initialisations in wait for enough entropy.

 2. Solving bug SPEC-2625 will require use of UUID.

 3. Porting to systems that haven't libuuid is made more
    easy after that.

Bug-AGL: SPEC-2625

Change-Id: I27d8b611946686dea6fab250697afe9b89aac869
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 27 insertions, 0 deletions

diff --git a/src/uuid.h b/src/uuid.h
new file mode 100644
index 00000000..ee467d14
--- /dev/null
+++ b/src/uuid.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2016-2019 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#define UUID_BINARY_LENGTH   16
+#define UUID_STRINGZ_LENGTH  37
+
+typedef unsigned char uuid_binary_t[UUID_BINARY_LENGTH];
+typedef char uuid_stringz_t[UUID_STRINGZ_LENGTH];
+
+void uuid_new_binary(uuid_binary_t uuid);
+void uuid_new_stringz(uuid_stringz_t uuid);