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3fead03e7d
Fixes golang/go#60409 Change-Id: I2d872a1a6fb63c27ab3753deff370e1c2f752bdd Reviewed-on: https://go-review.googlesource.com/c/sys/+/508397 Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Benny Siegert <bsiegert@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com>
48 lines
1.2 KiB
Go
48 lines
1.2 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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// +build linux netbsd
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package unix_test
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import (
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"testing"
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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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