probe module unload failed.

[cfc4n]

TC program unload failed when CTRL+C send,and Close() function called, It does not unload ebpf program from kernel.
and can display it with command bpftool net show. used tc filter del dev eth0 ingress/egress to unload them.
at #148 .

func (this *MOpenSSLProbe) setupManagersTC() error {
	var ifname, binaryPath string

	ifname = this.conf.(*OpensslConfig).Ifname

	switch this.conf.(*OpensslConfig).elfType {
	case ELF_TYPE_BIN:
		binaryPath = this.conf.(*OpensslConfig).Curlpath
	case ELF_TYPE_SO:
		binaryPath = this.conf.(*OpensslConfig).Openssl
	default:
		//如果没找到
		binaryPath = "/lib/x86_64-linux-gnu/libssl.so.1.1"
	}

	this.logger.Printf("%s\tInterface:%s, Pcapng filepath:%s\n", this.Name(), ifname, this.pcapngFilename)

	this.bpfManager = &manager.Manager{
		Probes: []*manager.Probe{
			// customize deleteed TC filter
			// tc filter del dev eth0 ingress
			// tc filter del dev eth0 egress
			{
				Section:          "classifier/egress",
				EbpfFuncName:     "egress_cls_func",
				Ifname:           ifname,
				NetworkDirection: manager.Egress,
			},
			{
				Section:          "classifier/ingress",
				EbpfFuncName:     "ingress_cls_func",
				Ifname:           ifname,
				NetworkDirection: manager.Ingress,
			},
			// --------------------------------------------------

			// openssl masterkey
			{
				Section:          "uprobe/SSL_write_key",
				EbpfFuncName:     "probe_ssl_master_key",
				AttachToFuncName: "SSL_write",
				BinaryPath:       binaryPath,
				UID:              "uprobe_ssl_master_key",
			},
		},

		Maps: []*manager.Map{
			{
				Name: "mastersecret_events",
			},
			{
				Name: "skb_events",
			},
		},
	}

	this.bpfManagerOptions = manager.Options{
		DefaultKProbeMaxActive: 512,

		VerifierOptions: ebpf.CollectionOptions{
			Programs: ebpf.ProgramOptions{
				LogSize: 2097152,
			},
		},

		RLimit: &unix.Rlimit{
			Cur: math.MaxUint64,
			Max: math.MaxUint64,
		},
	}

	if this.conf.EnableGlobalVar() {
		// 填充 RewriteContants 对应map
		this.bpfManagerOptions.ConstantEditors = this.constantEditor()
	}
	return nil
}