[libvirt] [PATCH v3 09/13] Introduce virConnectIsAlive API

[Jiri Denemark]

This API can be used to check if the socket associated with
virConnectPtr is still open or it was closed (probably because keepalive
protocol timed out). If there the connection is local (i.e., no socket
is associated with the connection, it is trivially always alive.
---
Notes:
    Version 3:
    - no changes
    
    Version 2:
    - new patch

 include/libvirt/libvirt.h.in |    1 +
 src/driver.h                 |    3 +++
 src/libvirt.c                |   36 ++++++++++++++++++++++++++++++++++++
 src/libvirt_public.syms      |    1 +
 4 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index ad59804..ca76963 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -2551,6 +2551,7 @@ int virInterfaceIsActive(virInterfacePtr iface);
 
 int virConnectIsEncrypted(virConnectPtr conn);
 int virConnectIsSecure(virConnectPtr conn);
+int virConnectIsAlive(virConnectPtr conn);
 
 /*
  * CPU specification API
diff --git a/src/driver.h b/src/driver.h
index c1223c1..a23f05b 100644
--- a/src/driver.h
+++ b/src/driver.h
@@ -509,6 +509,8 @@ typedef int
 typedef int
     (*virDrvConnectIsSecure)(virConnectPtr conn);
 typedef int
+    (*virDrvConnectIsAlive)(virConnectPtr conn);
+typedef int
     (*virDrvDomainIsActive)(virDomainPtr dom);
 typedef int
     (*virDrvDomainIsPersistent)(virDomainPtr dom);
@@ -898,6 +900,7 @@ struct _virDriver {
     virDrvDomainBlockJobSetSpeed domainBlockJobSetSpeed;
     virDrvDomainBlockPull domainBlockPull;
     virDrvSetKeepAlive setKeepAlive;
+    virDrvConnectIsAlive isAlive;
 };
 
 typedef int
diff --git a/src/libvirt.c b/src/libvirt.c
index 23602f7..5c5a15c 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -16871,3 +16871,39 @@ error:
     virDispatchError(conn);
     return -1;
 }
+
+/**
+ * virConnectIsAlive:
+ * @conn: pointer to the connection object
+ *
+ * Determine if the connection to the hypervisor is still alive
+ *
+ * A connection will be classed as alive if it is either local, or running
+ * over a channel (TCP or UNIX socket) which is not closed.
+ *
+ * Returns 1 if alive, 0 if dead, -1 on error
+ */
+int virConnectIsAlive(virConnectPtr conn)
+{
+    VIR_DEBUG("conn=%p", conn);
+
+    virResetLastError();
+
+    if (!VIR_IS_CONNECT(conn)) {
+        virLibConnError(VIR_ERR_INVALID_CONN, __FUNCTION__);
+        virDispatchError(NULL);
+        return -1;
+    }
+    if (conn->driver->isAlive) {
+        int ret;
+        ret = conn->driver->isAlive(conn);
+        if (ret < 0)
+            goto error;
+        return ret;
+    }
+
+    virLibConnError(VIR_ERR_NO_SUPPORT, __FUNCTION__);
+error:
+    virDispatchError(conn);
+    return -1;
+}
diff --git a/src/libvirt_public.syms b/src/libvirt_public.syms
index 468e28a..f1de89d 100644
--- a/src/libvirt_public.syms
+++ b/src/libvirt_public.syms
@@ -491,6 +491,7 @@ LIBVIRT_0.9.5 {
 
 LIBVIRT_0.9.7 {
     global:
+        virConnectIsAlive;
         virConnectSetKeepAlive;
         virDomainReset;
         virDomainSnapshotGetParent;
-- 
1.7.7