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// 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"
"unsafe"
"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)
}
}
func TestMremapPtr(t *testing.T) {
p1, err := unix.MmapPtr(-1, 0, nil, uintptr(2*unix.Getpagesize()),
unix.PROT_READ|unix.PROT_WRITE, unix.MAP_ANON|unix.MAP_PRIVATE)
if err != nil {
t.Fatalf("MmapPtr: %v", err)
}
p2 := unsafe.Add(p1, unix.Getpagesize())
if err := unix.MunmapPtr(p2, uintptr(unix.Getpagesize())); err != nil {
t.Fatalf("MunmapPtr: %v", err)
}
*(*byte)(p1) = 42
if _, err := unix.MremapPtr(
p1, uintptr(unix.Getpagesize()),
p2, uintptr(unix.Getpagesize()),
unix.MremapFixed|unix.MremapMaymove); err != nil {
t.Fatalf("MremapPtr: %v", err)
}
if got := *(*byte)(p2); got != 42 {
t.Errorf("got %d, want 42", got)
}
if err := unix.MunmapPtr(p2, uintptr(unix.Getpagesize())); err != nil {
t.Fatalf("MunmapPtr: %v", err)
}
}
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