435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ipv6
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import (
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"net"
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"runtime"
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"golang.org/x/net/internal/socket"
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)
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// BUG(mikio): On Windows, the ReadBatch and WriteBatch methods of
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// PacketConn are not implemented.
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// A Message represents an IO message.
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//
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// type Message struct {
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// Buffers [][]byte
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// OOB []byte
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// Addr net.Addr
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// N int
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// NN int
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// Flags int
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// }
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//
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// The Buffers fields represents a list of contiguous buffers, which
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// can be used for vectored IO, for example, putting a header and a
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// payload in each slice.
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// When writing, the Buffers field must contain at least one byte to
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// write.
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// When reading, the Buffers field will always contain a byte to read.
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//
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// The OOB field contains protocol-specific control or miscellaneous
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// ancillary data known as out-of-band data.
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// It can be nil when not required.
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//
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// The Addr field specifies a destination address when writing.
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// It can be nil when the underlying protocol of the endpoint uses
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// connection-oriented communication.
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// After a successful read, it may contain the source address on the
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// received packet.
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//
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// The N field indicates the number of bytes read or written from/to
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// Buffers.
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//
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// The NN field indicates the number of bytes read or written from/to
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// OOB.
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//
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// The Flags field contains protocol-specific information on the
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// received message.
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type Message = socket.Message
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// ReadBatch reads a batch of messages.
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//
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// The provided flags is a set of platform-dependent flags, such as
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// syscall.MSG_PEEK.
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//
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// On a successful read it returns the number of messages received, up
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// to len(ms).
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//
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// On Linux, a batch read will be optimized.
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// On other platforms, this method will read only a single message.
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func (c *payloadHandler) ReadBatch(ms []Message, flags int) (int, error) {
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if !c.ok() {
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return 0, errInvalidConn
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}
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switch runtime.GOOS {
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case "linux":
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n, err := c.RecvMsgs([]socket.Message(ms), flags)
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if err != nil {
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err = &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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return n, err
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default:
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n := 1
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err := c.RecvMsg(&ms[0], flags)
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if err != nil {
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n = 0
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err = &net.OpError{Op: "read", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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return n, err
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}
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}
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// WriteBatch writes a batch of messages.
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//
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// The provided flags is a set of platform-dependent flags, such as
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// syscall.MSG_DONTROUTE.
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//
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// It returns the number of messages written on a successful write.
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//
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// On Linux, a batch write will be optimized.
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// On other platforms, this method will write only a single message.
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func (c *payloadHandler) WriteBatch(ms []Message, flags int) (int, error) {
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if !c.ok() {
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return 0, errInvalidConn
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}
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switch runtime.GOOS {
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case "linux":
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n, err := c.SendMsgs([]socket.Message(ms), flags)
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if err != nil {
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err = &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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return n, err
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default:
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n := 1
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err := c.SendMsg(&ms[0], flags)
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if err != nil {
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n = 0
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err = &net.OpError{Op: "write", Net: c.PacketConn.LocalAddr().Network(), Source: c.PacketConn.LocalAddr(), Err: err}
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}
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return n, err
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}
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}
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