syscall: GetsockoptInt.

R=rsc, iant
CC=golang-dev
https://golang.org/cl/4271060
diff --git a/src/pkg/syscall/syscall_linux_386.go b/src/pkg/syscall/syscall_linux_386.go
index dbdb089..eaf2fa4 100644
--- a/src/pkg/syscall/syscall_linux_386.go
+++ b/src/pkg/syscall/syscall_linux_386.go
@@ -130,6 +130,11 @@
 	return
 }
 
+func getsockopt(s int, level int, name int, val uintptr, vallen *_Socklen) (errno int) {
+	_, errno = socketcall(_GETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
+	return
+}
+
 func setsockopt(s int, level int, name int, val uintptr, vallen int) (errno int) {
 	_, errno = socketcall(_SETSOCKOPT, uintptr(s), uintptr(level), uintptr(name), uintptr(val), uintptr(vallen), 0)
 	return