diff --git a/tasks/standard/TaskExtra.scala b/tasks/standard/TaskExtra.scala
index 79f40e301..d53527fe7 100644
--- a/tasks/standard/TaskExtra.scala
+++ b/tasks/standard/TaskExtra.scala
@@ -185,7 +185,7 @@ object TaskExtra extends TaskExtra
 	def processIO(s: TaskStreams[_]): ProcessIO =
 	{
 		def transfer(id: String) = (in: InputStream) => BasicIO.transferFully(in, s.binary(id))
-		new ProcessIO(BasicIO.closeOut, transfer(s.outID), transfer(s.errorID))
+		new ProcessIO(BasicIO.closeOut, transfer(s.outID), transfer(s.errorID), inheritInput = {_ => None})
 	}
 	def reduced[S](i: IndexedSeq[Task[S]], f: (S, S) => S): Task[S] =
 		i match
@@ -225,4 +225,4 @@ object TaskExtra extends TaskExtra
 	def failures[A](results: Seq[Result[A]]): Seq[Incomplete] = results.collect { case Inc(i) => i }
 
 	def incompleteDeps(incs: Seq[Incomplete]): Incomplete = Incomplete(None, causes = incs)
-}
\ No newline at end of file
+}
diff --git a/util/process/InheritInput.scala b/util/process/InheritInput.scala
index bd45ebe62..5cfe30b79 100755
--- a/util/process/InheritInput.scala
+++ b/util/process/InheritInput.scala
@@ -7,9 +7,9 @@ import java.lang.{ProcessBuilder => JProcessBuilder}
 
 /** On java 7, inherit System.in for a ProcessBuilder. */
 private[sbt] object InheritInput {
-	def apply(p: JProcessBuilder): (Boolean, JProcessBuilder) = (redirectInput, inherit) match {
-		case (Some(m), Some(f)) => (true, m.invoke(p, f).asInstanceOf[JProcessBuilder])
-		case _ => (false, p)
+	def apply(p: JProcessBuilder): Option[JProcessBuilder] = (redirectInput, inherit) match {
+		case (Some(m), Some(f)) => Some(m.invoke(p, f).asInstanceOf[JProcessBuilder])
+		case _ => None
 	}
 
 	private[this] val pbClass = Class.forName("java.lang.ProcessBuilder")
diff --git a/util/process/Process.scala b/util/process/Process.scala
index 5a1f46b4a..bd7e5cbc6 100644
--- a/util/process/Process.scala
+++ b/util/process/Process.scala
@@ -180,15 +180,15 @@ trait ProcessBuilder extends SourcePartialBuilder with SinkPartialBuilder
 	def canPipeTo: Boolean
 }
 /** Each method will be called in a separate thread.*/
-final class ProcessIO(val writeInput: OutputStream => Unit, val processOutput: InputStream => Unit, val processError: InputStream => Unit) extends NotNull
+final class ProcessIO(val writeInput: OutputStream => Unit, val processOutput: InputStream => Unit, val processError: InputStream => Unit, val inheritInput: JProcessBuilder => Option[JProcessBuilder]) extends NotNull
 {
-	def withOutput(process: InputStream => Unit): ProcessIO = new ProcessIO(writeInput, process, processError)
-	def withError(process: InputStream => Unit): ProcessIO = new ProcessIO(writeInput, processOutput, process)
-	def withInput(write: OutputStream => Unit): ProcessIO = new ProcessIO(write, processOutput, processError)
+	def withOutput(process: InputStream => Unit): ProcessIO = new ProcessIO(writeInput, process, processError, inheritInput)
+	def withError(process: InputStream => Unit): ProcessIO = new ProcessIO(writeInput, processOutput, process, inheritInput)
+	def withInput(write: OutputStream => Unit): ProcessIO = new ProcessIO(write, processOutput, processError, inheritInput)
 }
 trait ProcessLogger
 {
 	def info(s: => String): Unit
 	def error(s: => String): Unit
 	def buffer[T](f: => T): T
-}
\ No newline at end of file
+}
diff --git a/util/process/ProcessImpl.scala b/util/process/ProcessImpl.scala
index cea74272f..e58122efa 100644
--- a/util/process/ProcessImpl.scala
+++ b/util/process/ProcessImpl.scala
@@ -43,8 +43,8 @@ private object Future
 
 object BasicIO
 {
-	def apply(buffer: StringBuffer, log: Option[ProcessLogger], withIn: Boolean) = new ProcessIO(input(withIn), processFully(buffer), getErr(log))
-	def apply(log: ProcessLogger, withIn: Boolean) = new ProcessIO(input(withIn), processInfoFully(log), processErrFully(log))
+	def apply(buffer: StringBuffer, log: Option[ProcessLogger], withIn: Boolean) = new ProcessIO(input(withIn), processFully(buffer), getErr(log), inheritInput(withIn))
+	def apply(log: ProcessLogger, withIn: Boolean) = new ProcessIO(input(withIn), processInfoFully(log), processErrFully(log), inheritInput(withIn))
 
 	def getErr(log: Option[ProcessLogger]) = log match { case Some(lg) => processErrFully(lg); case None => toStdErr }
 
@@ -78,9 +78,9 @@ object BasicIO
 		readFully()
 	}
 	def connectToIn(o: OutputStream) { transferFully(Uncloseable protect System.in, o) }
-	def input(connect: Boolean): OutputStream => Unit = if(connect) connectToIn else closeOut
-	def standard(connectInput: Boolean): ProcessIO = standard(input(connectInput))
-	def standard(in: OutputStream => Unit): ProcessIO = new ProcessIO(in, toStdOut, toStdErr)
+	def input(connect: Boolean): OutputStream => Unit =	if(connect) connectToIn else closeOut
+	def standard(connectInput: Boolean): ProcessIO = standard(input(connectInput), inheritInput(connectInput))
+	def standard(in: OutputStream => Unit, inheritIn: JProcessBuilder => Option[JProcessBuilder]): ProcessIO = new ProcessIO(in, toStdOut, toStdErr, inheritIn)
 
 	def toStdErr = (in: InputStream) => transferFully(in, System.err)
 	def toStdOut = (in: InputStream) => transferFully(in, System.out)
@@ -113,6 +113,8 @@ object BasicIO
 		read
 		in.close()
 	}
+
+	def inheritInput(connect: Boolean) = { p: JProcessBuilder => if (connect) InheritInput(p) else None }
 }
 
 
@@ -154,7 +156,7 @@ private abstract class AbstractProcessBuilder extends ProcessBuilder with SinkPa
 	private[this] def lines(withInput: Boolean, nonZeroException: Boolean, log: Option[ProcessLogger]): Stream[String] =
 	{
 		val streamed = Streamed[String](nonZeroException)
-		val process = run(new ProcessIO(BasicIO.input(withInput), BasicIO.processFully(streamed.process), BasicIO.getErr(log)))
+		val process = run(new ProcessIO(BasicIO.input(withInput), BasicIO.processFully(streamed.process), BasicIO.getErr(log), BasicIO.inheritInput(withInput)))
 		Spawn { streamed.done(process.exitValue()) }
 		streamed.stream()
 	}
@@ -379,13 +381,14 @@ private[sbt] class SimpleProcessBuilder(p: JProcessBuilder) extends AbstractProc
 {
 	override def run(io: ProcessIO): Process =
 	{
-		val (inherited, pp) = InheritInput(p)
-		val process = pp.start() // start the external process
-		import io.{writeInput, processOutput, processError}
-		// spawn threads that process the input, output, and error streams using the functions defined in `io`
-		if(!inherited)
-			Spawn(writeInput(process.getOutputStream), true)
+		import io._
+		val process = inheritInput(p) map (_.start()) getOrElse {
+			val proc = p.start()
+			Spawn(writeInput(proc.getOutputStream))
+			proc
+		}
 
+		// spawn threads that process the output and error streams.
 		val outThread = Spawn(processOutput(process.getInputStream))
 		val errorThread =
 			if(!p.redirectErrorStream)
@@ -408,7 +411,13 @@ private class SimpleProcess(p: JProcess, outputThreads: List[Thread]) extends Pr
 	override def exitValue() =
 	{
 		def waitDone(): Unit =
-			try { p.waitFor() } catch { case _: InterruptedException => waitDone() }
+			try {
+				p.waitFor()
+			} catch {
+				case _: InterruptedException => 
+					// Guard against possible spurious wakeups, check thread interrupted status.
+					if(Thread.interrupted()) p.destroy() else waitDone()
+			}
 		waitDone()
 		outputThreads.foreach(_.join()) // this ensures that all output is complete before returning (waitFor does not ensure this)
 		p.exitValue()