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.
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, err := runtime.Mmap(nil, ^uintptr(0)&^(runtime.GetPhysPageSize()-1), 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)
21 if p != nil || err != runtime.ENOMEM {
22 t.Errorf("mmap = %v, %v, want nil, %v", p, err, runtime.ENOMEM)
26 func TestPhysPageSize(t *testing.T) {
27 // Mmap fails if the address is not page aligned, so we can
28 // use this to test if the page size is the true page size.
29 ps := runtime.GetPhysPageSize()
31 // Get a region of memory to play with. This should be page-aligned.
32 b, err := runtime.Mmap(nil, 2*ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE, -1, 0)
34 t.Fatalf("Mmap: %v", err)
37 if runtime.GOOS == "aix" {
38 // AIX does not allow mapping a range that is already mapped.
39 runtime.Munmap(unsafe.Pointer(uintptr(b)), 2*ps)
42 // Mmap should fail at a half page into the buffer.
43 _, err = runtime.Mmap(unsafe.Pointer(uintptr(b)+ps/2), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0)
45 t.Errorf("Mmap should have failed with half-page alignment %d, but succeeded: %v", ps/2, err)
48 // Mmap should succeed at a full page into the buffer.
49 _, err = runtime.Mmap(unsafe.Pointer(uintptr(b)+ps), ps, 0, runtime.MAP_ANON|runtime.MAP_PRIVATE|runtime.MAP_FIXED, -1, 0)
51 t.Errorf("Mmap at full-page alignment %d failed: %v", ps, err)