net: dragonfly support

Make the net package build and work on dragonfly.

R=bradfitz
CC=golang-dev
https://golang.org/cl/13173044

src/pkg/net/cgo_bsd.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build !netgo
-// +build darwin freebsd
+// +build darwin dragonfly freebsd
 
 package net
 

src/pkg/net/cgo_unix.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // +build !netgo
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/dial_test.go

@@ -137,7 +137,7 @@ func TestSelfConnect(t *testing.T) {
 		n = 1000
 	}
 	switch runtime.GOOS {
-	case "darwin", "freebsd", "netbsd", "openbsd", "plan9", "windows":
+	case "darwin", "dragonfly", "freebsd", "netbsd", "openbsd", "plan9", "windows":
 		// Non-Linux systems take a long time to figure
 		// out that there is nothing listening on localhost.
 		n = 100

src/pkg/net/dnsclient_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 // DNS client: see RFC 1035.
 // Has to be linked into package net for Dial.

src/pkg/net/dnsclient_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/dnsconfig_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 // Read system DNS config from /etc/resolv.conf
 

src/pkg/net/fd_poll_runtime.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/fd_posix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/fd_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/fd_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/file_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/interface_bsd.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd netbsd openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
 
 package net
 

src/pkg/net/interface_bsd_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd netbsd openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
 
 package net
 

src/pkg/net/interface_dragonfly.go

+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+// interfaceMulticastAddrTable returns addresses for a specific
+// interface.
+func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
+	// TODO(mikio): Implement this like other platforms.
+	return nil, nil
+}

src/pkg/net/interface_unix_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/iprawsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/ipsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 // Internet protocol family sockets for POSIX
 

src/pkg/net/lookup_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 package net
 

src/pkg/net/multicast_test.go

@@ -158,7 +158,7 @@ func checkMulticastListener(c *UDPConn, ip IP) error {
 
 func multicastRIBContains(ip IP) (bool, error) {
 	switch runtime.GOOS {
-	case "netbsd", "openbsd", "plan9", "solaris", "windows":
+	case "dragonfly", "netbsd", "openbsd", "plan9", "solaris", "windows":
 		return true, nil // not implemented yet
 	case "linux":
 		if runtime.GOARCH == "arm" || runtime.GOARCH == "alpha" {

src/pkg/net/port_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd
 
 // Read system port mappings from /etc/services
 

src/pkg/net/sendfile_dragonfly.go

+// Copyright 2011 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"io"
+	"os"
+	"syscall"
+)
+
+// maxSendfileSize is the largest chunk size we ask the kernel to copy
+// at a time.
+const maxSendfileSize int = 4 << 20
+
+// sendFile copies the contents of r to c using the sendfile
+// system call to minimize copies.
+//
+// if handled == true, sendFile returns the number of bytes copied and any
+// non-EOF error.
+//
+// if handled == false, sendFile performed no work.
+func sendFile(c *netFD, r io.Reader) (written int64, err error, handled bool) {
+	// DragonFly uses 0 as the "until EOF" value. If you pass in more bytes than the
+	// file contains, it will loop back to the beginning ad nauseum until it's sent
+	// exactly the number of bytes told to. As such, we need to know exactly how many
+	// bytes to send.
+	var remain int64 = 0
+
+	lr, ok := r.(*io.LimitedReader)
+	if ok {
+		remain, r = lr.N, lr.R
+		if remain <= 0 {
+			return 0, nil, true
+		}
+	}
+	f, ok := r.(*os.File)
+	if !ok {
+		return 0, nil, false
+	}
+
+	if remain == 0 {
+		fi, err := f.Stat()
+		if err != nil {
+			return 0, err, false
+		}
+
+		remain = fi.Size()
+	}
+
+	// The other quirk with DragonFly's sendfile implementation is that it doesn't
+	// use the current position of the file -- if you pass it offset 0, it starts
+	// from offset 0. There's no way to tell it "start from current position", so
+	// we have to manage that explicitly.
+	pos, err := f.Seek(0, os.SEEK_CUR)
+	if err != nil {
+		return 0, err, false
+	}
+
+	if err := c.writeLock(); err != nil {
+		return 0, err, true
+	}
+	defer c.writeUnlock()
+
+	dst := c.sysfd
+	src := int(f.Fd())
+	for remain > 0 {
+		n := maxSendfileSize
+		if int64(n) > remain {
+			n = int(remain)
+		}
+		pos1 := pos
+		n, err1 := syscall.Sendfile(dst, src, &pos1, n)
+		if n > 0 {
+			pos += int64(n)
+			written += int64(n)
+			remain -= int64(n)
+		}
+		if n == 0 && err1 == nil {
+			break
+		}
+		if err1 == syscall.EAGAIN {
+			if err1 = c.pd.WaitWrite(); err1 == nil {
+				continue
+			}
+		}
+		if err1 == syscall.EINTR {
+			continue
+		}
+		if err1 != nil {
+			// This includes syscall.ENOSYS (no kernel
+			// support) and syscall.EINVAL (fd types which
+			// don't implement sendfile together)
+			err = &OpError{"sendfile", c.net, c.raddr, err1}
+			break
+		}
+	}
+	if lr != nil {
+		lr.N = remain
+	}
+	return written, err, written > 0
+}

src/pkg/net/sock_bsd.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd netbsd openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
 
 package net
 

src/pkg/net/sock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/sockopt_bsd.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd netbsd openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
 
 package net
 

src/pkg/net/sockopt_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/sockoptip_bsd.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd netbsd openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
 
 package net
 

src/pkg/net/sockoptip_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/sys_cloexec.go

@@ -5,7 +5,7 @@
 // This file implements sysSocket and accept for platforms that do not
 // provide a fast path for setting SetNonblock and CloseOnExec.
 
-// +build darwin freebsd netbsd openbsd
+// +build darwin dragonfly freebsd netbsd openbsd
 
 package net
 

src/pkg/net/tcpsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/tcpsockopt_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/tcpsockopt_unix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build freebsd linux netbsd
+// +build dragonfly freebsd linux netbsd
 
 package net
 

src/pkg/net/udp_test.go

@@ -224,7 +224,7 @@ func TestIPv6LinkLocalUnicastUDP(t *testing.T) {
 		{"udp6", "[" + laddr + "%" + ifi.Name + "]:0", false},
 	}
 	switch runtime.GOOS {
-	case "darwin", "freebsd", "openbsd", "netbsd":
+	case "darwin", "dragonfly", "freebsd", "openbsd", "netbsd":
 		tests = append(tests, []test{
 			{"udp", "[localhost%" + ifi.Name + "]:0", true},
 			{"udp6", "[localhost%" + ifi.Name + "]:0", true},

src/pkg/net/udpsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net
 

src/pkg/net/unixsock_posix.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux netbsd openbsd windows
+// +build darwin dragonfly freebsd linux netbsd openbsd windows
 
 package net