48 lines
1.7 KiB
Kotlin
48 lines
1.7 KiB
Kotlin
/*
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* Copyright 2021 dorkbox, llc
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.executor
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import java.lang.reflect.Field
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/**
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* In Java <9, this will return -1, since there is no consistent method to get the PID from the specified process
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*/
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internal object PidHelper {
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const val INVALID = -1L
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fun get(process: Process): Long {
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// cannot get the pid from a process in Java <9 (technically there are TONS of hacks to do this, but it's better to just update the JVM)
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val type = process::class.java.name
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try {
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// reflection is OK here **BECAUSE** this only runs in java <9 (where reflection permissions are allowed)
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if (type == "java.lang.UNIXProcess") {
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val f: Field = process.javaClass.getDeclaredField("pid")
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f.isAccessible = true
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return f.getInt(process).toLong()
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}
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// if (type == "java.lang.Win32Process" || type == "java.lang.ProcessImpl") {
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// windows is not supported UNLESS we use JNA, which I do not want to do, as we want minimal dependencies.
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} catch (ignored: Exception) {
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}
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return INVALID
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}
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}
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