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a7f19e9c20
Use the same implementation as on freebsd which is also what the dragonfly libc uses. Change-Id: I0ed513ae15fcb6dac77b2fc76f662723d66b75c6 Reviewed-on: https://go-review.googlesource.com/c/sys/+/636435 Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Carlos Amedee <carlos@golang.org> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Gopher Robot <gobot@golang.org>
65 lines
1.5 KiB
Go
65 lines
1.5 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 dragonfly || freebsd || linux || netbsd || openbsd
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package unix_test
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import (
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"os"
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"path/filepath"
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"runtime"
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"testing"
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"golang.org/x/sys/unix"
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)
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func TestDup3(t *testing.T) {
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tempFile, err := os.Create(filepath.Join(t.TempDir(), "TestDup3"))
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if err != nil {
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t.Fatal(err)
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}
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defer tempFile.Close()
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oldFd := int(tempFile.Fd())
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// On NetBSD, it is not an error if oldFd == newFd
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if runtime.GOOS != "netbsd" {
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if got, want := unix.Dup3(oldFd, oldFd, 0), unix.EINVAL; got != want {
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t.Fatalf("Dup3: expected err %v, got %v", want, got)
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}
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}
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// Create and reserve a file descriptor.
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// Dup3 automatically closes it before reusing it.
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nullFile, err := os.Open("/dev/null")
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if err != nil {
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t.Fatalf("Open failed: %v", err)
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}
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defer nullFile.Close()
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newFd := int(nullFile.Fd())
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err = unix.Dup3(oldFd, newFd, 0)
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if err != nil {
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t.Fatalf("Dup3: %v", err)
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}
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b1 := []byte("Test123")
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b2 := make([]byte, 7)
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_, err = unix.Write(newFd, b1)
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if err != nil {
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t.Fatalf("Write to Dup3 fd failed: %v", err)
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}
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_, err = unix.Seek(oldFd, 0, 0)
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if err != nil {
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t.Fatalf("Seek failed: %v", err)
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}
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_, err = unix.Read(oldFd, b2)
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if err != nil {
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t.Fatalf("Read back failed: %v", err)
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}
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if string(b1) != string(b2) {
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t.Errorf("Dup3: read %q from file, want %q", string(b2), string(b1))
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}
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}
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