code review 36020043: os, os/exec, os/user: add support for GOOS=solaris

src/pkg/os/file_unix.go

 // Copyright 2009 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 dragonfly freebsd linux netbsd openbsd
+// +build darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package os
 
 import (
         "runtime"
         "sync/atomic"
         "syscall"
 )
 
 // File represents an open file descriptor.
@@ skipping 267 matching lines @@
 }
 
 // TempDir returns the default directory to use for temporary files.
 func TempDir() string {
         dir := Getenv("TMPDIR")
         if dir == "" {
                 dir = "/tmp"
         }
         return dir
 }