1 files changed, 0 insertions, 238 deletions
diff --git a/pkg/flipcall/endpoint_unsafe.go b/pkg/flipcall/endpoint_unsafe.go
deleted file mode 100644
index 8319955e0..000000000
--- a/pkg/flipcall/endpoint_unsafe.go
+++ /dev/null
@@ -1,238 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package flipcall
-
-import (
-	"fmt"
-	"math"
-	"reflect"
-	"sync/atomic"
-	"syscall"
-	"unsafe"
-)
-
-// An Endpoint provides the ability to synchronously transfer data and control
-// to a connected peer Endpoint, which may be in another process.
-//
-// Since the Endpoint control transfer model is synchronous, at any given time
-// one Endpoint "has control" (designated the *active* Endpoint), and the other
-// is "waiting for control" (designated the *inactive* Endpoint). Users of the
-// flipcall package arbitrarily designate one Endpoint as initially-active, and
-// the other as initially-inactive; in a client/server protocol, the client
-// Endpoint is usually initially-active (able to send a request) and the server
-// Endpoint is usually initially-inactive (waiting for a request). The
-// initially-active Endpoint writes data to be sent to Endpoint.Data(), and
-// then synchronously transfers control to the inactive Endpoint by calling
-// Endpoint.SendRecv(), becoming the inactive Endpoint in the process. The
-// initially-inactive Endpoint waits for control by calling
-// Endpoint.RecvFirst(); receiving control causes it to become the active
-// Endpoint. After this, the protocol is symmetric: the active Endpoint reads
-// data sent by the peer by reading from Endpoint.Data(), writes data to be
-// sent to the peer into Endpoint.Data(), and then calls Endpoint.SendRecv() to
-// exchange roles with the peer, which blocks until the peer has done the same.
-type Endpoint struct {
-	// shutdown is non-zero if Endpoint.Shutdown() has been called. shutdown is
-	// accessed using atomic memory operations.
-	shutdown uint32
-
-	// dataCap is the size of the datagram part of the packet window in bytes.
-	// dataCap is immutable.
-	dataCap uint32
-
-	// packet is the beginning of the packet window. packet is immutable.
-	packet unsafe.Pointer
-
-	ctrl endpointControlState
-}
-
-// Init must be called on zero-value Endpoints before first use. If it
-// succeeds, Destroy() must be called once the Endpoint is no longer in use.
-//
-// ctrlMode specifies how connected Endpoints will exchange control. Both
-// connected Endpoints must specify the same value for ctrlMode.
-//
-// pwd represents the packet window used to exchange data with the peer
-// Endpoint. FD may differ between Endpoints if they are in different
-// processes, but must represent the same file. The packet window must
-// initially be filled with zero bytes.
-func (ep *Endpoint) Init(ctrlMode ControlMode, pwd PacketWindowDescriptor) error {
-	if pwd.Length < pageSize {
-		return fmt.Errorf("packet window size (%d) less than minimum (%d)", pwd.Length, pageSize)
-	}
-	if pwd.Length > math.MaxUint32 {
-		return fmt.Errorf("packet window size (%d) exceeds maximum (%d)", pwd.Length, math.MaxUint32)
-	}
-	m, _, e := syscall.Syscall6(syscall.SYS_MMAP, 0, uintptr(pwd.Length), syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED, uintptr(pwd.FD), uintptr(pwd.Offset))
-	if e != 0 {
-		return fmt.Errorf("failed to mmap packet window: %v", e)
-	}
-	ep.dataCap = uint32(pwd.Length) - uint32(packetHeaderBytes)
-	ep.packet = (unsafe.Pointer)(m)
-	if err := ep.initControlState(ctrlMode); err != nil {
-		ep.unmapPacket()
-		return err
-	}
-	return nil
-}
-
-// NewEndpoint is a convenience function that returns an initialized Endpoint
-// allocated on the heap.
-func NewEndpoint(ctrlMode ControlMode, pwd PacketWindowDescriptor) (*Endpoint, error) {
-	var ep Endpoint
-	if err := ep.Init(ctrlMode, pwd); err != nil {
-		return nil, err
-	}
-	return &ep, nil
-}
-
-func (ep *Endpoint) unmapPacket() {
-	syscall.Syscall(syscall.SYS_MUNMAP, uintptr(ep.packet), uintptr(ep.dataCap)+packetHeaderBytes, 0)
-	ep.dataCap = 0
-	ep.packet = nil
-}
-
-// Destroy releases resources owned by ep. No other Endpoint methods may be
-// called after Destroy.
-func (ep *Endpoint) Destroy() {
-	ep.unmapPacket()
-}
-
-// Packets consist of an 8-byte header followed by an arbitrarily-sized
-// datagram. The header consists of:
-//
-// - A 4-byte native-endian sequence number, which is incremented by the active
-// Endpoint after it finishes writing to the packet window. The sequence number
-// is needed to handle spurious wakeups.
-//
-// - A 4-byte native-endian datagram length in bytes.
-const (
-	sizeofUint32      = unsafe.Sizeof(uint32(0))
-	packetHeaderBytes = 2 * sizeofUint32
-)
-
-func (ep *Endpoint) seq() *uint32 {
-	return (*uint32)(ep.packet)
-}
-
-func (ep *Endpoint) dataLen() *uint32 {
-	return (*uint32)((unsafe.Pointer)(uintptr(ep.packet) + sizeofUint32))
-}
-
-// DataCap returns the maximum datagram size supported by ep in bytes.
-func (ep *Endpoint) DataCap() uint32 {
-	return ep.dataCap
-}
-
-func (ep *Endpoint) data() unsafe.Pointer {
-	return unsafe.Pointer(uintptr(ep.packet) + packetHeaderBytes)
-}
-
-// Data returns the datagram part of ep's packet window as a byte slice.
-//
-// Note that the packet window is shared with the potentially-untrusted peer
-// Endpoint, which may concurrently mutate the contents of the packet window.
-// Thus:
-//
-// - Readers must not assume that two reads of the same byte in Data() will
-// return the same result. In other words, readers should read any given byte
-// in Data() at most once.
-//
-// - Writers must not assume that they will read back the same data that they
-// have written. In other words, writers should avoid reading from Data() at
-// all.
-func (ep *Endpoint) Data() []byte {
-	var bs []byte
-	bsReflect := (*reflect.SliceHeader)((unsafe.Pointer)(&bs))
-	bsReflect.Data = uintptr(ep.data())
-	bsReflect.Len = int(ep.DataCap())
-	bsReflect.Cap = bsReflect.Len
-	return bs
-}
-
-// SendRecv transfers control to the peer Endpoint, causing its call to
-// Endpoint.SendRecv() or Endpoint.RecvFirst() to return with the given
-// datagram length, then blocks until the peer Endpoint calls
-// Endpoint.SendRecv() or Endpoint.SendLast().
-//
-// Preconditions: No previous call to ep.SendRecv() or ep.RecvFirst() has
-// returned an error. ep.SendLast() has never been called.
-func (ep *Endpoint) SendRecv(dataLen uint32) (uint32, error) {
-	dataCap := ep.DataCap()
-	if dataLen > dataCap {
-		return 0, fmt.Errorf("can't send packet with datagram length %d (maximum %d)", dataLen, dataCap)
-	}
-	atomic.StoreUint32(ep.dataLen(), dataLen)
-	if err := ep.doRoundTrip(); err != nil {
-		return 0, err
-	}
-	recvDataLen := atomic.LoadUint32(ep.dataLen())
-	if recvDataLen > dataCap {
-		return 0, fmt.Errorf("received packet with invalid datagram length %d (maximum %d)", recvDataLen, dataCap)
-	}
-	return recvDataLen, nil
-}
-
-// RecvFirst blocks until the peer Endpoint calls Endpoint.SendRecv(), then
-// returns the datagram length specified by that call.
-//
-// Preconditions: ep.SendRecv(), ep.RecvFirst(), and ep.SendLast() have never
-// been called.
-func (ep *Endpoint) RecvFirst() (uint32, error) {
-	if err := ep.doWaitFirst(); err != nil {
-		return 0, err
-	}
-	recvDataLen := atomic.LoadUint32(ep.dataLen())
-	if dataCap := ep.DataCap(); recvDataLen > dataCap {
-		return 0, fmt.Errorf("received packet with invalid datagram length %d (maximum %d)", recvDataLen, dataCap)
-	}
-	return recvDataLen, nil
-}
-
-// SendLast causes the peer Endpoint's call to Endpoint.SendRecv() or
-// Endpoint.RecvFirst() to return with the given datagram length.
-//
-// Preconditions: No previous call to ep.SendRecv() or ep.RecvFirst() has
-// returned an error. ep.SendLast() has never been called.
-func (ep *Endpoint) SendLast(dataLen uint32) error {
-	dataCap := ep.DataCap()
-	if dataLen > dataCap {
-		return fmt.Errorf("can't send packet with datagram length %d (maximum %d)", dataLen, dataCap)
-	}
-	atomic.StoreUint32(ep.dataLen(), dataLen)
-	if err := ep.doNotifyLast(); err != nil {
-		return err
-	}
-	return nil
-}
-
-// Shutdown causes concurrent and future calls to ep.SendRecv(),
-// ep.RecvFirst(), and ep.SendLast() to unblock and return errors. It does not
-// wait for concurrent calls to return.
-func (ep *Endpoint) Shutdown() {
-	if atomic.SwapUint32(&ep.shutdown, 1) == 0 {
-		ep.interruptForShutdown()
-	}
-}
-
-func (ep *Endpoint) isShutdown() bool {
-	return atomic.LoadUint32(&ep.shutdown) != 0
-}
-
-type endpointShutdownError struct{}
-
-// Error implements error.Error.
-func (endpointShutdownError) Error() string {
-	return "Endpoint.Shutdown() has been called"
-}