Extracted Process Control to separate interface to allow better tests

src/ProcessControl/Fork.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Toalett\Multiprocessing\ProcessControl;
+
+class Fork
+{
+	public int $pid;
+
+	public function __construct(int $pid)
+	{
+		$this->pid = $pid;
+	}
+
+	public function failed(): bool
+	{
+		return $this->pid < 0;
+	}
+
+	public function isChild(): bool
+	{
+		return $this->pid === 0;
+	}
+
+	public function isParent(): bool
+	{
+		return $this->pid !== 0;
+	}
+}

src/ProcessControl/PCNTL.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Toalett\Multiprocessing\ProcessControl;
+
+class PCNTL implements ProcessControl
+{
+	public function fork(): Fork
+	{
+		$pid = pcntl_fork();
+		return new Fork($pid);
+	}
+
+	public function wait(int $options = 0): Wait
+	{
+		$pid = pcntl_wait($status, $options);
+		return new Wait($pid, $status);
+	}
+}

src/ProcessControl/ProcessControl.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Toalett\Multiprocessing\ProcessControl;
+
+interface ProcessControl
+{
+	public function fork(): Fork;
+
+	public function wait(int $options = 0): Wait;
+}

src/ProcessControl/Wait.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Toalett\Multiprocessing\ProcessControl;
+
+class Wait
+{
+	public int $pid;
+	public int $status;
+
+	public function __construct(int $pid, int $status = 0)
+	{
+		$this->pid = $pid;
+		$this->status = $status;
+	}
+
+	public function childStopped(): bool
+	{
+		return $this->pid > 0;
+	}
+
+	public function failed(): bool
+	{
+		return $this->pid < 0;
+	}
+}