mirror of
https://github.com/golang/sys.git
synced 2026-01-29 07:02:06 +03:00
a0ef40af1f
NetBSD apparently doesn't allow remapping into used address space.
This means that the test that uses mremap to move a mmapped page
into a new address should first mmap (to reserve)
then munmap (to free) the destination.
Fixes golang/go#68180
Change-Id: If66b67e7166ca4dc4331a8cfc3e3a285416e9849
GitHub-Last-Rev: 92058c2f25
GitHub-Pull-Request: golang/sys#198
Cq-Include-Trybots: luci.golang.try:x_sys-gotip-netbsd-amd64
Reviewed-on: https://go-review.googlesource.com/c/sys/+/594756
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Joedian Reid <joedian@google.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
// 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)
|
|
}
|
|
}
|