syscall: add socket control message support for darwin, freebsd, linux
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4528113
diff --git a/src/pkg/syscall/syscall_unix.go b/src/pkg/syscall/syscall_unix.go
index d17ef52..20c8a13 100644
--- a/src/pkg/syscall/syscall_unix.go
+++ b/src/pkg/syscall/syscall_unix.go
@@ -16,6 +16,8 @@
Stderr = 2
)
+const darwinAMD64 = OS == "darwin" && ARCH == "amd64"
+
func Syscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
