[libvirt] [PATCH] Use virNetServerRun instead of custom main loop

[Daniel P. Berrange]

From: "Daniel P. Berrange" <berrange at redhat.com>

The LXC controller code currently directly invokes the
libvirt main loop code. The problem is that this misses
the cleanup of virNetServerClient connections that
virNetServerRun takes care of.

The result is that when libvirtd is stopped, the
libvirt_lxc controller process gets stuck in a I/O loop.
When libvirtd is then started again, it fails to connect
to the controller and thus kills of the entire domain.

Signed-off-by: Daniel P. Berrange <berrange at redhat.com>
---
 src/lxc/lxc_controller.c | 33 ++++++++++++++-------------------
 1 file changed, 14 insertions(+), 19 deletions(-)

diff --git a/src/lxc/lxc_controller.c b/src/lxc/lxc_controller.c
index 4746897..aec2d4c 100644
--- a/src/lxc/lxc_controller.c
+++ b/src/lxc/lxc_controller.c
@@ -97,6 +97,8 @@ struct _virLXCControllerConsole {
     char fromHostBuf[1024];
     size_t fromContLen;
     char fromContBuf[1024];
+
+    virNetServerPtr server;
 };
 
 typedef struct _virLXCController virLXCController;
@@ -278,6 +280,7 @@ static int virLXCControllerAddConsole(virLXCControllerPtr ctrl,
         virReportOOMError();
         return -1;
     }
+    ctrl->consoles[ctrl->nconsoles-1].server = ctrl->server;
     ctrl->consoles[ctrl->nconsoles-1].hostFd = hostFd;
     ctrl->consoles[ctrl->nconsoles-1].hostWatch = -1;
 
@@ -663,12 +666,11 @@ static int lxcControllerClearCapabilities(void)
     return 0;
 }
 
-static bool quit = false;
 static bool wantReboot = false;
 static virMutex lock;
 
 
-static void virLXCControllerSignalChildIO(virNetServerPtr server ATTRIBUTE_UNUSED,
+static void virLXCControllerSignalChildIO(virNetServerPtr server,
                                           siginfo_t *info ATTRIBUTE_UNUSED,
                                           void *opaque)
 {
@@ -678,8 +680,8 @@ static void virLXCControllerSignalChildIO(virNetServerPtr server ATTRIBUTE_UNUSE
 
     ret = waitpid(-1, &status, WNOHANG);
     if (ret == ctrl->initpid) {
+        virNetServerQuit(server);
         virMutexLock(&lock);
-        quit = true;
         if (WIFSIGNALED(status) &&
             WTERMSIG(status) == SIGHUP)
             wantReboot = true;
@@ -731,7 +733,7 @@ static void virLXCControllerConsoleUpdateWatch(virLXCControllerConsolePtr consol
                 VIR_DEBUG(":fail");
                 virReportSystemError(errno, "%s",
                                      _("Unable to add epoll fd"));
-                quit = true;
+                virNetServerQuit(console->server);
                 goto cleanup;
             }
             console->hostEpoll = events;
@@ -742,8 +744,8 @@ static void virLXCControllerConsoleUpdateWatch(virLXCControllerConsolePtr consol
         if (epoll_ctl(console->epollFd, EPOLL_CTL_DEL, console->hostFd, NULL) < 0) {
             virReportSystemError(errno, "%s",
                                  _("Unable to remove epoll fd"));
-                VIR_DEBUG(":fail");
-            quit = true;
+            VIR_DEBUG(":fail");
+            virNetServerQuit(console->server);
             goto cleanup;
         }
         console->hostEpoll = 0;
@@ -768,7 +770,7 @@ static void virLXCControllerConsoleUpdateWatch(virLXCControllerConsolePtr consol
                 virReportSystemError(errno, "%s",
                                      _("Unable to add epoll fd"));
                 VIR_DEBUG(":fail");
-                quit = true;
+                virNetServerQuit(console->server);
                 goto cleanup;
             }
             console->contEpoll = events;
@@ -779,8 +781,8 @@ static void virLXCControllerConsoleUpdateWatch(virLXCControllerConsolePtr consol
         if (epoll_ctl(console->epollFd, EPOLL_CTL_DEL, console->contFd, NULL) < 0) {
             virReportSystemError(errno, "%s",
                                  _("Unable to remove epoll fd"));
-                VIR_DEBUG(":fail");
-            quit = true;
+            VIR_DEBUG(":fail");
+            virNetServerQuit(console->server);
             goto cleanup;
         }
         console->contEpoll = 0;
@@ -809,7 +811,7 @@ static void virLXCControllerConsoleEPoll(int watch, int fd, int events, void *op
                 continue;
             virReportSystemError(errno, "%s",
                                  _("Unable to wait on epoll"));
-            quit = true;
+            virNetServerQuit(console->server);
             goto cleanup;
         }
 
@@ -926,7 +928,7 @@ error:
     virEventRemoveHandle(console->contWatch);
     virEventRemoveHandle(console->hostWatch);
     console->contWatch = console->hostWatch = -1;
-    quit = true;
+    virNetServerQuit(console->server);
     virMutexUnlock(&lock);
 }
 
@@ -995,14 +997,7 @@ static int virLXCControllerMain(virLXCControllerPtr ctrl)
         }
     }
 
-    virMutexLock(&lock);
-    while (!quit) {
-        virMutexUnlock(&lock);
-        if (virEventRunDefaultImpl() < 0)
-            goto cleanup;
-        virMutexLock(&lock);
-    }
-    virMutexUnlock(&lock);
+    virNetServerRun(ctrl->server);
 
     err = virGetLastError();
     if (!err || err->code == VIR_ERR_OK)
-- 
1.7.11.7