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.
13 // Test that the error value returned by mmap is positive, as that is
14 // what the code in mem_bsd.go, mem_darwin.go, and mem_linux.go expects.
15 // See the uses of ENOMEM in sysMap in those files.
16 func TestMmapErrorSign(t
*testing
.T
) {
17 p
, err
:= runtime
.Mmap(nil, ^uintptr(0)&^(runtime
.GetPhysPageSize()-1), 0, runtime
.MAP_ANON|runtime
.MAP_PRIVATE
, -1, 0)
19 if p
!= nil || err
!= runtime
.ENOMEM
{
20 t
.Errorf("mmap = %v, %v, want nil, %v", p
, err
, runtime
.ENOMEM
)
24 func TestPhysPageSize(t
*testing
.T
) {
25 // Mmap fails if the address is not page aligned, so we can
26 // use this to test if the page size is the true page size.
27 ps
:= runtime
.GetPhysPageSize()
29 // Get a region of memory to play with. This should be page-aligned.
30 b
, err
:= runtime
.Mmap(nil, 2*ps
, 0, runtime
.MAP_ANON|runtime
.MAP_PRIVATE
, -1, 0)
32 t
.Fatalf("Mmap: %v", err
)
35 // Mmap should fail at a half page into the buffer.
36 _
, err
= runtime
.Mmap(unsafe
.Pointer(uintptr(b
)+ps
/2), ps
, 0, runtime
.MAP_ANON|runtime
.MAP_PRIVATE|runtime
.MAP_FIXED
, -1, 0)
38 t
.Errorf("Mmap should have failed with half-page alignment %d, but succeeded: %v", ps
/2, err
)
41 // Mmap should succeed at a full page into the buffer.
42 _
, err
= runtime
.Mmap(unsafe
.Pointer(uintptr(b
)+ps
), ps
, 0, runtime
.MAP_ANON|runtime
.MAP_PRIVATE|runtime
.MAP_FIXED
, -1, 0)
44 t
.Errorf("Mmap at full-page alignment %d failed: %v", ps
, err
)