SO_CNX_ADVICE                    = 0x35
	SO_COOKIE                        = 0x39
	SO_DETACH_REUSEPORT_BPF          = 0x44
	SO_DOMAIN                        = 0x1029
	SO_DONTROUTE                     = 0x10
	SO_ERROR                         = 0x1007
	SO_INCOMING_CPU                  = 0x31
	SO_INCOMING_NAPI_ID              = 0x38
	SO_KEEPALIVE                     = 0x8
	SO_LINGER                        = 0x80

// a big-endian byte slice with zero or more leading zeroes.
func addASN1IntBytes(b *cryptobyte.Builder, bytes []byte) {
	for len(bytes) > 0 && bytes[0] == 0 {
		bytes = bytes[1:]
	}
	if len(bytes) == 0 {
		b.SetError(errors.New("invalid integer"))
		return
	}
	b.AddASN1(asn1.INTEGER, func(c *cryptobyte.Builder) {
		if bytes[0]&0x80 != 0 {
			c.AddUint8(0)
		}
		c.AddBytes(bytes)
	})
}

	SO_CNX_ADVICE                    = 0x37
	SO_COOKIE                        = 0x3b
	SO_DETACH_REUSEPORT_BPF          = 0x47
	SO_DOMAIN                        = 0x1029
	SO_DONTROUTE                     = 0x10
	SO_ERROR                         = 0x1007
	SO_INCOMING_CPU                  = 0x33
	SO_INCOMING_NAPI_ID              = 0x3a
	SO_KEEPALIVE                     = 0x8
	SO_LINGER                        = 0x80

	SO_CNX_ADVICE                    = 0x35
	SO_COOKIE                        = 0x39
	SO_DETACH_REUSEPORT_BPF          = 0x44
	SO_DOMAIN                        = 0x27
	SO_DONTROUTE                     = 0x5
	SO_ERROR                         = 0x4
	SO_INCOMING_CPU                  = 0x31
	SO_INCOMING_NAPI_ID              = 0x38
	SO_KEEPALIVE                     = 0x9
	SO_LINGER                        = 0xd

	SO_CNX_ADVICE                    = 0x35
	SO_COOKIE                        = 0x39
	SO_DETACH_REUSEPORT_BPF          = 0x44
	SO_DOMAIN                        = 0x27
	SO_DONTROUTE                     = 0x5
	SO_ERROR                         = 0x4
	SO_INCOMING_CPU                  = 0x31
	SO_INCOMING_NAPI_ID              = 0x38
	SO_KEEPALIVE                     = 0x9
	SO_LINGER                        = 0xd

	SO_CNX_ADVICE                    = 0x35
	SO_COOKIE                        = 0x39
	SO_DETACH_REUSEPORT_BPF          = 0x44
	SO_DOMAIN                        = 0x27
	SO_DONTROUTE                     = 0x5
	SO_ERROR                         = 0x4
	SO_INCOMING_CPU                  = 0x31
	SO_INCOMING_NAPI_ID              = 0x38
	SO_KEEPALIVE                     = 0x9
	SO_LINGER                        = 0xd

	SO_CLUSTERCONNTYPE_NONE         = 1
	SO_CLUSTERCONNTYPE_SAME_CLUSTER = 2
	SO_CLUSTERCONNTYPE_SAME_IMAGE   = 4
	SO_DEBUG                        = 0x0001
	SO_DONTROUTE                    = 0x0010
	SO_ERROR                        = 0x1007
	SO_IGNOREINCOMINGPUSH           = 0x1
	SO_IGNORESOURCEVIPA             = 0x0002
	SO_KEEPALIVE                    = 0x0008
	SO_LINGER                       = 0x0080

	SO_DGRAM_ERRIND               = 0x200
	SO_DOMAIN                     = 0x100c
	SO_DONTLINGER                 = -0x81
	SO_DONTROUTE                  = 0x10
	SO_ERROPT                     = 0x40000
	SO_ERROR                      = 0x1007
	SO_EXCLBIND                   = 0x1015
	SO_HIWAT                      = 0x10
	SO_ISNTTY                     = 0x800
	SO_ISTTY                      = 0x400

	cancel context.CancelCauseFunc

	mu  sync.Mutex // guards err
	err error      // first setError value for mapRoundTripError to consider
}

func (tr *transportRequest) extraHeaders() Header {
	if tr.extra == nil {
		tr.extra = make(Header)
	}
	return tr.extra
}

func (tr *transportRequest) setError(err error) {
	tr.mu.Lock()
	if tr.err == nil {
		tr.err = err
	}
	tr.mu.Unlock()
}

	reqInfo := (&logger.ReqInfo{}).AppendTags("remotePeer", addr)
	ctx := logger.SetReqInfo(GlobalContext, reqInfo)
	peersLogOnceIf(ctx, err, "add-node-err-"+addr)
	nodeInfo.SetAddr(addr)
	nodeInfo.SetError(err.Error())
}

// GetSysErrors - Memory information
func (sys *NotificationSys) GetSysErrors(ctx context.Context) []madmin.SysErrors {
	reply := make([]madmin.SysErrors, len(sys.peerClients))