trace: do not always call exit() in trace_enable_events

The problem is that
  virsh qemu-monitor-command --hmp VM log trace:help
forces QEMU to exit even when running VM normally.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1458128212-4197-2-git-send-email-den@openvz.org
CC: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

diff --git a/trace/control.c b/trace/control.c
index ccddda537ffbf5a1372be4c3e5125f462934b148..d099f735d50b7516ee25934f52d991150ac208d0 100644 (file)
--- a/trace/control.c
+++ b/trace/control.c
@@ -20,6 +20,7 @@
 #include "qemu/log.h"
 #endif
 #include "qemu/error-report.h"
+#include "monitor/monitor.h"
 
 int trace_events_enabled_count;
 bool trace_events_dstate[TRACE_EVENT_COUNT];
@@ -132,7 +133,9 @@ void trace_enable_events(const char *line_buf)
 {
     if (is_help_option(line_buf)) {
         trace_list_events();
-        exit(0);
+        if (cur_mon == NULL) {
+            exit(0);
+        }
     } else {
         do_trace_enable_events(line_buf);
     }