syscall: test Gettimeofday everywhere, not just on Darwin

The Darwin-only restriction was because we were late in the Go 1.7
cycle when the test was added.

In the process, I noticed Gettimeofday wasn't in the "unimplemented
midden heap" section of syscall_nacl.go, despite this line in the
original go1.txt:

pkg syscall, func Gettimeofday(*Timeval) error

So, add it, returning ENOSYS like the others.

Change-Id: Id7e02e857b753f8d079bee335c22368734e92254
Reviewed-on: https://go-review.googlesource.com/26772
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Quentin Smith <quentin@golang.org>

src/syscall/syscall_darwin_test.go

-// Copyright 2016 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
-// +build amd64 386 arm arm64
-
-package syscall_test
-
-import (
-	"syscall"
-	"testing"
-)
-
-func TestDarwinGettimeofday(t *testing.T) {
-	tv := &syscall.Timeval{}
-	if err := syscall.Gettimeofday(tv); err != nil {
-		t.Fatal(err)
-	}
-	if tv.Sec == 0 && tv.Usec == 0 {
-		t.Fatal("Sec and Usec both zero")
-	}
-}

src/syscall/syscall_nacl.go

@@ -295,6 +295,7 @@ func Getgroups() ([]int, error)         { return []int{1}, nil }
 func Getpagesize() int                  { return 65536 }
 func Getppid() int                      { return 2 }
 func Getpid() int                       { return 3 }
+func Gettimeofday(tv *Timeval) error    { return ENOSYS }
 func Getuid() int                       { return 1 }
 func Kill(pid int, signum Signal) error { return ENOSYS }
 func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {

src/syscall/syscall_test.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"internal/testenv"
 	"os"
+	"runtime"
 	"syscall"
 	"testing"
 )
@@ -59,3 +60,16 @@ func TestExecErrPermutedFds(t *testing.T) {
 		t.Fatalf("StartProcess of invalid program returned err = nil")
 	}
 }
+
+func TestGettimeofday(t *testing.T) {
+	if runtime.GOOS == "nacl" {
+		t.Skip("not implemented on nacl")
+	}
+	tv := &syscall.Timeval{}
+	if err := syscall.Gettimeofday(tv); err != nil {
+		t.Fatal(err)
+	}
+	if tv.Sec == 0 && tv.Usec == 0 {
+		t.Fatal("Sec and Usec both zero")
+	}
+}