runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveCount(fd *netFD, n int) error {
	if n == 0 {
		n = defaultTCPKeepAliveCount
	} else if n < 0 {
		return nil
	}

	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, n)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)

	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPIDLE, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if !unix.SupportTCPKeepAliveIdleIntvlCNT() {
		return syscall.EPROTOTYPE
	}

	if d == 0 {
		d = defaultTCPKeepAliveInterval

// keep them accessible with pull linknames.
// This may change in the future. Please do not depend on them
// in new code.

// golang.org/x/sys linknames getsockopt.
// Do not remove or change the type signature.
//
//go:linkname getsockopt

          privileged: false
          capabilities:
            drop:
            - ALL
            add: # See https://man7.org/linux/man-pages/man7/capabilities.7.html
            - NET_ADMIN # Required for TPROXY and setsockopt
            - SYS_ADMIN # Required for `setns` - doing things in other netns
            - NET_RAW # Required for RAW/PACKET sockets, TPROXY
          readOnlyRootFilesystem: true
          runAsGroup: 1337

	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
}

func SetsockoptInt(fd, level, opt int, value int) (err error) {
	var n = int32(value)
	return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
}

func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
}

    puts "usage: #{$PROGRAM_NAME} port"
    exit(-1)
end

port = Integer(ARGV[0])

server = WEBrick::HTTPServer.new(
    :BindAddress => '*',
    :Port => port,
    :AcceptCallback => -> (s) { s.setsockopt(Socket::IPPROTO_TCP, Socket::TCP_NODELAY, 1) },
)

trap 'INT' do server.shutdown end

server.mount_proc '/health' do |req, res|
    res.status = 200
    res.body = {'status' => 'Details is healthy'}.to_json

//sys   Getkerninfo(op int32, where uintptr, size uintptr, arg int64) (i int32, err error)
//sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
//sys	Listen(s int, backlog int) (err error)
//sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
//sys	socket(domain int, typ int, proto int) (fd int, err error)

	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_getsockopt_trampoline()

//go:cgo_import_dynamic libc_getsockopt getsockopt "libc.so"

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) {

//go:cgo_import_dynamic libc_connect connect "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Getkerninfo getkerninfo "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_getsockopt getsockopt "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Listen listen "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setsockopt setsockopt "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_socket socket "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_socketpair socketpair "libc.a/shr_64.o"

	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_getsockopt_trampoline()

//go:cgo_import_dynamic libc_getsockopt getsockopt "libc.so"

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error) {