util: Add interface for adding PID to the monitor

Add interface for adding task PID to the monitor.
Signed-off-by: NWang Huaqiang <huaqiang.wang@intel.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/libvirt_private.syms

@@ -2681,6 +2681,7 @@ virResctrlInfoGetCache;
 virResctrlInfoGetMonitorPrefix;
 virResctrlInfoMonFree;
 virResctrlInfoNew;
+virResctrlMonitorAddPID;
 virResctrlMonitorDeterminePath;
 virResctrlMonitorNew;
 

src/util/virresctrl.c

@@ -2529,3 +2529,11 @@ virResctrlMonitorDeterminePath(virResctrlMonitorPtr monitor,
 
     return 0;
 }
+
+
+int
+virResctrlMonitorAddPID(virResctrlMonitorPtr monitor,
+                        pid_t pid)
+{
+    return virResctrlAddPID(monitor->path, pid);
+}

src/util/virresctrl.h

@@ -197,4 +197,8 @@ virResctrlMonitorNew(void);
 int
 virResctrlMonitorDeterminePath(virResctrlMonitorPtr monitor,
                                const char *machinename);
+
+int
+virResctrlMonitorAddPID(virResctrlMonitorPtr monitor,
+                        pid_t pid);
 #endif /*  __VIR_RESCTRL_H__ */