libgo/go/runtime/runtime_mmap_test.go

   1 // Copyright 2016 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // +build ignore
   6
   7 package runtime_test
   8
   9 import (
  10         "runtime"
  11         "runtime/internal/sys"
  12         "testing"
  13 )
  14
  15 // Test that the error value returned by mmap is positive, as that is
  16 // what the code in mem_bsd.go, mem_darwin.go, and mem_linux.go expects.
  17 // See the uses of ENOMEM in sysMap in those files.
  18 func TestMmapErrorSign(t *testing.T) {
  19         p := runtime.Mmap(nil, ^uintptr(0)&^(sys.PhysPageSize-1), 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)
  20
  21         // The runtime.mmap function is nosplit, but t.Errorf is not.
  22         // Reset the pointer so that we don't get an "invalid stack
  23         // pointer" error from t.Errorf if we call it.
  24         v := uintptr(p)
  25         p = nil
  26
  27         if v != runtime.ENOMEM {
  28                 t.Errorf("mmap = %v, want %v", v, runtime.ENOMEM)
  29         }
  30 }