net: add IP-level socket option helpers for Unix variants
Also reorganize socket options stuff but there are no API behavioral
changes.
R=rsc, fullung
CC=golang-dev
https://golang.org/cl/5494067
diff --git a/src/pkg/net/sockoptip_darwin.go b/src/pkg/net/sockoptip_darwin.go
new file mode 100644
index 0000000..dedfd6f
--- /dev/null
+++ b/src/pkg/net/sockoptip_darwin.go
@@ -0,0 +1,78 @@
+// 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.
+
+// IP-level socket options for Darwin
+
+package net
+
+import (
+ "os"
+ "syscall"
+)
+
+func ipv4MulticastInterface(fd *netFD) (*Interface, error) {
+ fd.incref()
+ defer fd.decref()
+ a, err := syscall.GetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF)
+ if err != nil {
+ return nil, os.NewSyscallError("getsockopt", err)
+ }
+ return ipv4AddrToInterface(IPv4(a[0], a[1], a[2], a[3]))
+}
+
+func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
+ ip, err := interfaceToIPv4Addr(ifi)
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ var x [4]byte
+ copy(x[:], ip.To4())
+ fd.incref()
+ defer fd.decref()
+ err = syscall.SetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, x)
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ return nil
+}
+
+func ipv4MulticastLoopback(fd *netFD) (bool, error) {
+ fd.incref()
+ defer fd.decref()
+ v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP)
+ if err != nil {
+ return false, os.NewSyscallError("getsockopt", err)
+ }
+ return v == 1, nil
+}
+
+func setIPv4MulticastLoopback(fd *netFD, v bool) error {
+ fd.incref()
+ defer fd.decref()
+ err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ return nil
+}
+
+func ipv4ReceiveInterface(fd *netFD) (bool, error) {
+ fd.incref()
+ defer fd.decref()
+ v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_RECVIF)
+ if err != nil {
+ return false, os.NewSyscallError("getsockopt", err)
+ }
+ return v == 1, nil
+}
+
+func setIPv4ReceiveInterface(fd *netFD, v bool) error {
+ fd.incref()
+ defer fd.decref()
+ err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_RECVIF, boolint(v))
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ return nil
+}
