From 2e07a1e14635ad25c57b66c13488feff4c8d2b0c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
Date: Thu, 23 May 2019 11:51:48 +0100
Subject: [PATCH] event: add API for requiring an event loop impl to be
 registered
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Reviewed-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 po/POTFILES.in      |  1 +
 src/util/virevent.c | 24 ++++++++++++++++++++++++
 src/util/virevent.h |  2 ++
 3 files changed, 27 insertions(+)

diff --git a/po/POTFILES.in b/po/POTFILES.in
index 7a791121e3..c26ac9497d 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -240,6 +240,7 @@
 @SRCDIR@/src/util/virdnsmasq.c
 @SRCDIR@/src/util/virerror.c
 @SRCDIR@/src/util/virerror.h
+@SRCDIR@/src/util/virevent.c
 @SRCDIR@/src/util/vireventpoll.c
 @SRCDIR@/src/util/virfcp.c
 @SRCDIR@/src/util/virfdstream.c
diff --git a/src/util/virevent.c b/src/util/virevent.c
index 3cac9f9472..f6c797724e 100644
--- a/src/util/virevent.c
+++ b/src/util/virevent.c
@@ -26,6 +26,7 @@
 #include "virlog.h"
 #include "virerror.h"
 
+#define VIR_FROM_THIS VIR_FROM_EVENT
 
 VIR_LOG_INIT("util.event");
 
@@ -251,6 +252,27 @@ void virEventRegisterImpl(virEventAddHandleFunc addHandle,
     removeTimeoutImpl = removeTimeout;
 }
 
+
+/**
+ * virEventRequireImpl:
+ *
+ * Require that there is an event loop implementation
+ * registered.
+ *
+ * Returns: -1 if no event loop is registered, 0 otherwise
+ */
+int virEventRequireImpl(void)
+{
+    if (!addHandleImpl || !addTimeoutImpl) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("An event loop implementation must be registered"));
+        return -1;
+    }
+
+    return 0;
+}
+
+
 /**
  * virEventRegisterDefaultImpl:
  *
@@ -276,6 +298,8 @@ int virEventRegisterDefaultImpl(void)
 {
     VIR_DEBUG("registering default event implementation");
 
+    virInitialize();
+
     virResetLastError();
 
     if (virEventPollInit() < 0) {
diff --git a/src/util/virevent.h b/src/util/virevent.h
index 0b4f7d2b1b..6c8fdcbac4 100644
--- a/src/util/virevent.h
+++ b/src/util/virevent.h
@@ -21,3 +21,5 @@
 
 #pragma once
 #include "internal.h"
+
+int virEventRequireImpl(void);