init(dylibPath:URL)throws(TunnelHandleError){

guardlet dylibHandle=dlopen(dylibPath.path, RTLD_NOW | RTLD_LOCAL)else{

if e!=nil{

errStr=String(cString: e!)

throw.dylib(errStr)

throw.dylib(dlerror().flatMap{String(cString: $0)}??"UNKNOWN")

self.dylibHandle= dylibHandle

guardlet startSym=dlsym(dylibHandle, startSymbol)else{

if e!=nil{

errStr=String(cString: e!)

throw.symbol(startSymbol, errStr)

throw.symbol(startSymbol,dlerror().flatMap{String(cString: $0)}??"UNKNOWN")

letopenTunnelFn=unsafeBitCast(startSym, to:OpenTunnel.self)

tunnelReadPipe=Pipe()

func close()throws{

dlclose(dylibHandle)

// This could be an isolated deinit in Swift 6.1

func close()throws(TunnelHandleError){

ifdlclose(dylibHandle)==0{

errs.append(TunnelHandleError.dylib(dlerror().flatMap{String(cString: $0)}??"UNKNOWN"))

try writeHandle.close()

errs.append(error)

try readHandle.close()

errs.append(error)

if !errs.isEmpty{

throw.close(errs)

case dylib(String)

case symbol(String,String)

case openTunnel(OpenTunnelError)

case pipe(anyError)

case close([anyError])

caselet.pipe(err):return"pipe error:\(err)"

caselet.dylib(d):return d

caselet.symbol(symbol, message):return"\(symbol):\(message)"

caselet.openTunnel(error):return"OpenTunnel:\(error.message)"

caselet.close(errs):return"close tunnel:\(errs.map(\.localizedDescription).joined(separator:","))"