payload_nocmsg.go 1.3 KB

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  1. // Copyright 2012 The Go Authors. All rights reserved.
  2. // Use of this source code is governed by a BSD-style
  3. // license that can be found in the LICENSE file.
  4. // +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
  5. package ipv4
  6. import "net"
  7. // ReadFrom reads a payload of the received IPv4 datagram, from the
  8. // endpoint c, copying the payload into b. It returns the number of
  9. // bytes copied into b, the control message cm and the source address
  10. // src of the received datagram.
  11. func (c *payloadHandler) ReadFrom(b []byte) (n int, cm *ControlMessage, src net.Addr, err error) {
  12. if !c.ok() {
  13. return 0, nil, nil, errInvalidConn
  14. }
  15. if n, src, err = c.PacketConn.ReadFrom(b); err != nil {
  16. return 0, nil, nil, err
  17. }
  18. return
  19. }
  20. // WriteTo writes a payload of the IPv4 datagram, to the destination
  21. // address dst through the endpoint c, copying the payload from b. It
  22. // returns the number of bytes written. The control message cm allows
  23. // the datagram path and the outgoing interface to be specified.
  24. // Currently only Darwin and Linux support this. The cm may be nil if
  25. // control of the outgoing datagram is not required.
  26. func (c *payloadHandler) WriteTo(b []byte, cm *ControlMessage, dst net.Addr) (n int, err error) {
  27. if !c.ok() {
  28. return 0, errInvalidConn
  29. }
  30. if dst == nil {
  31. return 0, errMissingAddress
  32. }
  33. return c.PacketConn.WriteTo(b, dst)
  34. }