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_bsd.go b/src/pkg/net/sockoptip_bsd.go
new file mode 100644
index 0000000..5f7dff2
--- /dev/null
+++ b/src/pkg/net/sockoptip_bsd.go
@@ -0,0 +1,54 @@
+// 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.
+
+// +build darwin freebsd netbsd openbsd
+
+// IP-level socket options for BSD variants
+
+package net
+
+import (
+ "os"
+ "syscall"
+)
+
+func ipv4MulticastTTL(fd *netFD) (int, error) {
+ fd.incref()
+ defer fd.decref()
+ v, err := syscall.GetsockoptByte(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL)
+ if err != nil {
+ return -1, os.NewSyscallError("getsockopt", err)
+ }
+ return int(v), nil
+}
+
+func setIPv4MulticastTTL(fd *netFD, v int) error {
+ fd.incref()
+ defer fd.decref()
+ err := syscall.SetsockoptByte(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL, byte(v))
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ return nil
+}
+
+func ipv6TrafficClass(fd *netFD) (int, error) {
+ fd.incref()
+ defer fd.decref()
+ v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_TCLASS)
+ if err != nil {
+ return -1, os.NewSyscallError("getsockopt", err)
+ }
+ return v, nil
+}
+
+func setIPv6TrafficClass(fd *netFD, v int) error {
+ fd.incref()
+ defer fd.decref()
+ err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_TCLASS, v)
+ if err != nil {
+ return os.NewSyscallError("setsockopt", err)
+ }
+ return nil
+}
