ctrl+c后如何在Gradle构建中终止shell进程

Question

当使用 ctrl-c 终止 Gradle 构建时，如何终止在 cmd.execute()-call 中创建的进程。

在这个例子中，calcTask-task 启动了 shell 进程“longRunningProcess.bat”，它是一个“sleep 300”。当使用 ctrl+c 中止 Gradle 构建时，“睡眠”进程仍处于活动状态。该异常确实处理 shell 中的错误，但不处理 ctrl+c。

apply plugin: "groovy"

dependencies {
  compile gradleApi()
}

task CreateLongRunningProcess(type: DefaultTask) {
    def file = new File('longRunningProcess.bat')
    file.write '@ECHO Start calculating - please wait 5 minutes.\n'
    file << '@sleep 300\n'
    file << '@ECHO Finished calculating.\n'
}

class CalcTask extends DefaultTask {
    @TaskAction
    def calculate() {
        String cmd = './longRunningProcess.bat'
        try {
            def proc = cmd.execute()
            proc.waitForProcessOutput(System.out, System.err)
        } catch (Exception e) {
            e.printStackTrace();
            println 'Exception occured'
        }
    }
}

task calcTask(type: CalcTask) {
    dependsOn(CreateLongRunningProcess)
}

---

$ ps -ef | grep sleep
$ ./gradlew -q calcTask
Start calculating - please wait 5 minutes.

<Aborted with ctrl+c>
$ ps -ef | grep sleep
 t035678    1900       1 ?        16:55:58 /usr/bin/sleep
$ kill 1900
$ ./longRunningProcess.bat
Start calculating - please wait 5 minutes.
<Aborted with ctrl+c>
Finished calculating.
$ ps -ef | grep sleep
$ ./gradlew --version
<snip>

------------------------------------------------------------
Gradle 4.4
------------------------------------------------------------

Build time:   2017-12-06 09:05:06 UTC
Revision:     cf7821a6f79f8e2a598df21780e3ff7ce8db2b82

Groovy:       2.4.12
Ant:          Apache Ant(TM) version 1.9.9 compiled on February 2 2017
JVM:          9.0.1 (Oracle Corporation 9.0.1+11)
OS:           Windows 7 6.1 amd64