<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"> <div class="MsoNormal">HI, everyone:</div><div class="MsoNormal"> </div><div class="MsoNormal">My target deal with network hotplug use virDomainDetachDeviceFlags. Because when the API return ,the network maybe doesnЁЏt remove from my vm guest os.</div> So I use virConnectDomainEventRegisterAny to register an event ID: VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED , my process as follow: <div class="MsoNormal">cb_para->call_id=virConnectDomainEventRegisterAny(cb_para->conn,cb_para->dom,VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED, VIR_DOMAIN_EVENT_CALLBACK(vnf_control_del_network_cb), cb_para, vnf_control_del_network_cb_free); </div><div class="MsoNormal"> </div><div class="MsoNormal"> flags |= VIR_DOMAIN_AFFECT_CONFIG; if (virDomainIsActive(dom) == 1) { flags |= VIR_DOMAIN_AFFECT_LIVE; } ret = virDomainDetachDeviceFlags(dom, xml, flags); </div> above code write in thread loop ,then in the same loop : while (1) { mission = vnf_mission_queue_get(task); if (mission == NULL) { sleep(1); continue; } vnf_op_process(&mission->info); // this will deal with network hotplug,will call virConnectDomainEventRegisterAny then call virDomainDetachDeviceFlags if (mission) { vnf_mission_free(mission); } <div class="MsoNormal"> if(virEventRunDefaultImpl() < 0) { // at here process the registered callback for event-registered </div><div class="MsoNormal"> printf();.... </div> } } <div class="MsoNormal">My problem is: some time , the virEventRunDefaultImpl can trigger the vnf_control_del_network_cb callback ,but some time there is nothing ,as if the VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED has lost.</div><div class="MsoNormal">what cause the <span style="background-color: rgb(221, 64, 50); color: rgb(102, 102, 102); font-family: Arial, "Microsoft YaHei", "\\5FAEШэбХКк", "\\5B8BЬх", "Malgun Gothic", Meiryo, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none;">Unpredictable behavior ? what is a correct use for virConnectDomainEventRegisterAny ? </div><div class="MsoNormal"><span style="color: rgb(102, 102, 102); font-family: Arial, 'Microsoft YaHei', '\\5FAEШэбХКк', '\\5B8BЬх', 'Malgun Gothic', Meiryo, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;"> </div><div class="MsoNormal"><span style="color: rgb(102, 102, 102); font-family: Arial, 'Microsoft YaHei', '\\5FAEШэбХКк', '\\5B8BЬх', 'Malgun Gothic', Meiryo, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;"> if can't trigger the vnf_control_del_network_cb callback , the memory :cb_para will mem-leak, </div><div class="MsoNormal"><span style="color: rgb(102, 102, 102); font-family: Arial, 'Microsoft YaHei', '\\5FAEШэбХКк', '\\5B8BЬх', 'Malgun Gothic', Meiryo, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;">so in order to deal the execpt ,i register a timer to process the VIR_DOMAIN_EVENT_ID_DEVICE_REMOVED timeout </div><div class="MsoNormal"><span style="color: rgb(102, 102, 102); font-family: Arial, 'Microsoft YaHei', '\\5FAEШэбХКк', '\\5B8BЬх', 'Malgun Gothic', Meiryo, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;">cb_para->timer_id = virEventAddTimeout(cb_para->time_out, vnf_control_del_network_timeout_cb, cb_para, vnf_control_del_network_cb_free);</div><div class="MsoNormal"><span style="color: rgb(102, 102, 102); font-family: Arial, 'Microsoft YaHei', '\\5FAEШэбХКк', '\\5B8BЬх', 'Malgun Gothic', Meiryo, sans-serif; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 21px; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); display: inline !important; float: none;">thought use the timer ,can i avoid the cb_para mem-leak, but fail to achive hotplug network . </div> </div>