在Golang中终止以os / exec开头的进程

Question

有没有办法终止Golang中以os.exec开始的进程？例如（来自http://golang.org/pkg/os/exec/#example_Cmd_Start），

cmd := exec.Command("sleep", "5")
err := cmd.Start()
if err != nil {
    log.Fatal(err)
}
log.Printf("Waiting for command to finish...")
err = cmd.Wait()
log.Printf("Command finished with error: %v", err)

是否可以提前3秒后终止该过程？

提前致谢

Answer 1

终止运行exec.Process：

// Start a process:
cmd := exec.Command("sleep", "5")
if err := cmd.Start(); err != nil {
    log.Fatal(err)
}

// Kill it:
if err := cmd.Process.Kill(); err != nil {
    log.Fatal("failed to kill process: ", err)
}

exec.Process超时后终止运行：

// Start a process:
cmd := exec.Command("sleep", "5")
if err := cmd.Start(); err != nil {
    log.Fatal(err)
}

// Wait for the process to finish or kill it after a timeout (whichever happens first):
done := make(chan error, 1)
go func() {
    done <- cmd.Wait()
}()
select {
case <-time.After(3 * time.Second):
    if err := cmd.Process.Kill(); err != nil {
        log.Fatal("failed to kill process: ", err)
    }
    log.Println("process killed as timeout reached")
case err := <-done:
    if err != nil {
        log.Fatalf("process finished with error = %v", err)
    }
    log.Print("process finished successfully")
}

该过程结束并且在done3秒钟内收到了错误（如果有的话），并且该程序在完成之前被终止了。