mirror of
https://github.com/rwinkhart/sys.git
synced 2026-08-29 05:16:30 -04:00
Dmitri Goutnik
92c4c39f76
Other BSDs provide dup3(2) syscall, on FreeBSD it is implemented as libc function using fcntl(2). This CL adds similar Go implementation. Fixes golang/go#55935 Change-Id: I9c6d762415c7bed5442966a7fcbf9a6f8dfdaf2a Reviewed-on: https://go-review.googlesource.com/c/sys/+/470675 TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Ian Lance Taylor <iant@google.com> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
66 lines
1.5 KiB
Go
66 lines
1.5 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 freebsd || linux || netbsd || openbsd
|
|
// +build freebsd linux netbsd openbsd
|
|
|
|
package unix_test
|
|
|
|
import (
|
|
"os"
|
|
"runtime"
|
|
"testing"
|
|
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
func TestDup3(t *testing.T) {
|
|
tempFile, err := os.CreateTemp("", "TestDup")
|
|
if err != nil {
|
|
t.Fatalf("CreateTemp failed: %v", err)
|
|
}
|
|
defer os.Remove(tempFile.Name())
|
|
defer tempFile.Close()
|
|
oldFd := int(tempFile.Fd())
|
|
|
|
// On NetBSD, it is not an error if oldFd == newFd
|
|
if runtime.GOOS != "netbsd" {
|
|
if got, want := unix.Dup3(oldFd, oldFd, 0), unix.EINVAL; got != want {
|
|
t.Fatalf("Dup3: expected err %v, got %v", want, got)
|
|
}
|
|
}
|
|
|
|
// Create and reserve a file descriptor.
|
|
// Dup3 automatically closes it before reusing it.
|
|
nullFile, err := os.Open("/dev/null")
|
|
if err != nil {
|
|
t.Fatalf("Open failed: %v", err)
|
|
}
|
|
defer nullFile.Close()
|
|
newFd := int(nullFile.Fd())
|
|
|
|
err = unix.Dup3(oldFd, newFd, 0)
|
|
if err != nil {
|
|
t.Fatalf("Dup3: %v", err)
|
|
}
|
|
|
|
b1 := []byte("Test123")
|
|
b2 := make([]byte, 7)
|
|
_, err = unix.Write(newFd, b1)
|
|
if err != nil {
|
|
t.Fatalf("Write to Dup3 fd failed: %v", err)
|
|
}
|
|
_, err = unix.Seek(oldFd, 0, 0)
|
|
if err != nil {
|
|
t.Fatalf("Seek failed: %v", err)
|
|
}
|
|
_, err = unix.Read(oldFd, b2)
|
|
if err != nil {
|
|
t.Fatalf("Read back failed: %v", err)
|
|
}
|
|
if string(b1) != string(b2) {
|
|
t.Errorf("Dup3: read %q from file, want %q", string(b2), string(b1))
|
|
}
|
|
}
|