You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: machine_unix.go
    path of file: ./repos/podman/pkg/machine/qemu
    
    the code of the file until where you have to start completion: //go:build dragonfly || freebsd || linux || netbsd || openbsd

package qemu

import (
	"bytes"
	"fmt"
	"syscall"

	"golang.org/x/sys/unix"
)

func isProcessAlive(pid int) bool {
	err := unix.Kill(pid, syscall.Signal(0))
	if err == nil || err == unix.EPERM {
		return true
	}
	re
    
func checkProcessStatus(processHint string, pid int, stderrBuf *bytes.Buffer) error {
	var status syscall.WaitStatus
	pid, err := syscall.Wait4(pid, &status, syscall.WNOHANG, nil)
	if err != nil {
		return fmt.Errorf("failed to read %s process status: %w", processHint, err)
	}
	if pid > 0 {
		// child exited
		return fmt.Errorf("%s exited unexpectedly with exit code %d, stderr: %s", processHint, status.ExitStatus(), stderrBuf.String())
	}
	return nil
}