PhutilBacktraceSignalHandler.php
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	<?php

	/**
	* Signal handler for SIGHUP which prints the current backtrace out to a
	* file. This is particularly helpful in debugging hung/spinning processes.
	*/
	final class PhutilBacktraceSignalHandler extends PhutilSignalHandler {

	public function canHandleSignal(PhutilSignalRouter $router, $signo) {
	return ($signo === SIGHUP);
	}

	public function handleSignal(PhutilSignalRouter $router, $signo) {
	$e = new Exception();
	$pid = getmypid();
	// Some Phabricator daemons may not be attached to a terminal.
	Filesystem::writeFile(
	sys_get_temp_dir().'/phabricator_backtrace_'.$pid,
	$e->getTraceAsString());
	}

	}