| // Copyright 2023 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. |
| |
| //go:build linux || netbsd |
| |
| package unix_test |
| |
| import ( |
| "testing" |
| |
| "golang.org/x/sys/unix" |
| ) |
| |
| func TestMremap(t *testing.T) { |
| b, err := unix.Mmap(-1, 0, unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE) |
| if err != nil { |
| t.Fatalf("Mmap: %v", err) |
| } |
| if err := unix.Mprotect(b, unix.PROT_READ|unix.PROT_WRITE); err != nil { |
| t.Fatalf("Mprotect: %v", err) |
| } |
| |
| b[0] = 42 |
| |
| bNew, err := unix.Mremap(b, unix.Getpagesize()*2, unix.MremapMaymove) |
| if err != nil { |
| t.Fatalf("Mremap2: %v", err) |
| } |
| bNew[unix.Getpagesize()+1] = 84 // checks |
| |
| if bNew[0] != 42 { |
| t.Fatal("first element value was changed") |
| } |
| if len(bNew) != unix.Getpagesize()*2 { |
| t.Fatal("new memory len not equal to specified len") |
| } |
| if cap(bNew) != unix.Getpagesize()*2 { |
| t.Fatal("new memory cap not equal to specified len") |
| } |
| |
| _, err = unix.Mremap(b, unix.Getpagesize(), unix.MremapFixed) |
| if err != unix.EINVAL { |
| t.Fatalf("remapping to a fixed address; got %v, want %v", err, unix.EINVAL) |
| } |
| } |