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Nuno Cruces
daa239428c
Fixes golang/go#56123 Change-Id: I63a7a6fb3a5b1bb556ac19d76a1e0b04a03ebcfa GitHub-Last-Rev: 39dbc8e308807bd07863b6f5a49bcdcf506bc0e7 GitHub-Pull-Request: golang/sys#197 Reviewed-on: https://go-review.googlesource.com/c/sys/+/592415 Reviewed-by: Dmitri Shuralyov <dmitshur@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Auto-Submit: Dmitri Shuralyov <dmitshur@google.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build linux || netbsd
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package unix_test
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import (
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"testing"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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func TestMremap(t *testing.T) {
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b, err := unix.Mmap(-1, 0, unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
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if err != nil {
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t.Fatalf("Mmap: %v", err)
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}
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if err := unix.Mprotect(b, unix.PROT_READ|unix.PROT_WRITE); err != nil {
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t.Fatalf("Mprotect: %v", err)
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}
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b[0] = 42
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bNew, err := unix.Mremap(b, unix.Getpagesize()*2, unix.MremapMaymove)
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if err != nil {
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t.Fatalf("Mremap2: %v", err)
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}
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bNew[unix.Getpagesize()+1] = 84 // checks
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if bNew[0] != 42 {
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t.Fatal("first element value was changed")
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}
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if len(bNew) != unix.Getpagesize()*2 {
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t.Fatal("new memory len not equal to specified len")
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}
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if cap(bNew) != unix.Getpagesize()*2 {
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t.Fatal("new memory cap not equal to specified len")
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}
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_, err = unix.Mremap(b, unix.Getpagesize(), unix.MremapFixed)
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if err != unix.EINVAL {
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t.Fatalf("remapping to a fixed address; got %v, want %v", err, unix.EINVAL)
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}
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}
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func TestMremapPtr(t *testing.T) {
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mmapProt := unix.PROT_NONE
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mmapPtrProt := unix.PROT_READ | unix.PROT_WRITE
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b, err := unix.Mmap(-1, 0, 2*unix.Getpagesize(), mmapProt, unix.MAP_ANON|unix.MAP_PRIVATE)
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if err != nil {
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t.Fatalf("Mmap: %v", err)
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}
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if _, err := unix.MmapPtr(-1, 0, unsafe.Pointer(&b[0]), uintptr(unix.Getpagesize()),
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mmapPtrProt, unix.MAP_ANON|unix.MAP_PRIVATE|unix.MAP_FIXED); err != nil {
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t.Fatalf("MmapPtr: %v", err)
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}
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b[0] = 42
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if _, err := unix.MremapPtr(
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unsafe.Pointer(&b[0]), uintptr(unix.Getpagesize()),
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unsafe.Pointer(&b[unix.Getpagesize()]), uintptr(unix.Getpagesize()),
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unix.MremapFixed|unix.MremapMaymove); err != nil {
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t.Fatalf("MremapPtr: %v", err)
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}
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if got := b[unix.Getpagesize()]; got != 42 {
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t.Errorf("got %d, want 42", got)
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}
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if err := unix.Munmap(b); err != nil {
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t.Fatalf("Munmap: %v", err)
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}
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}
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