execx.php
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	<?php

	/**
	* Execute a command and capture stdout and stderr. If the command exits with
	* a nonzero error code, a @{class:CommandException} will be thrown. If you need
	* to manually handle error conditions, use @{function:exec_manual}.
	*
	* list ($stdout, $stderr) = execx('ls %s', $file);
	*
	* @param string $cmd sprintf()-style command pattern to execute.
	* @param ... Arguments to sprintf pattern.
	* @return array List of stdout and stderr.
	*/
	function execx($cmd /* , ... */) {
	$args = func_get_args();
	$future = newv('ExecFuture', $args);
	return $future->resolvex();
	}


	/**
	* Execute a command and capture stdout, stderr, and the return value.
	*
	* list ($err, $stdout, $stderr) = exec_manual('ls %s', $file);
	*
	* When invoking this function, you must manually handle the error condition.
	* Error flows can often be simplified by using @{function:execx} instead,
	* which throws an exception when it encounters an error.
	*
	* @param string $cmd sprintf()-style command pattern to execute.
	* @param ... Arguments to sprintf pattern.
	* @return array List of return code, stdout, and stderr.
	*/
	function exec_manual($cmd /* , ... */) {
	$args = func_get_args();
	$ef = newv('ExecFuture', $args);
	return $ef->resolve();
	}


	/**
	* Wrapper for @{class:PhutilExecPassthru}.
	*
	* @param string $cmd sprintf()-style command pattern to execute.
	* @param ... Arguments to sprintf pattern.
	* @return int Return code.
	*/
	function phutil_passthru($cmd /* , ... */) {
	$args = func_get_args();
	return newv('PhutilExecPassthru', $args)->resolve();
	}


	/**
	* Return a human-readable signal name (like "SIGINT" or "SIGKILL") for a given
	* signal number.
	*
	* @param int $signo Signal number.
	* @return string Human-readable signal name.
	*/
	function phutil_get_signal_name($signo) {
	// These aren't always defined; try our best to look up the signal name.
	$constant_names = array(
	'SIGHUP',
	'SIGINT',
	'SIGQUIT',
	'SIGILL',
	'SIGTRAP',
	'SIGABRT',
	'SIGIOT',
	'SIGBUS',
	'SIGFPE',
	'SIGUSR1',
	'SIGSEGV',
	'SIGUSR2',
	'SIGPIPE',
	'SIGALRM',
	'SIGTERM',
	'SIGSTKFLT',
	'SIGCLD',
	'SIGCHLD',
	'SIGCONT',
	'SIGTSTP',
	'SIGTTIN',
	'SIGTTOU',
	'SIGURG',
	'SIGXCPU',
	'SIGXFSZ',
	'SIGVTALRM',
	'SIGPROF',
	'SIGWINCH',
	'SIGPOLL',
	'SIGIO',
	'SIGPWR',
	'SIGSYS',
	'SIGBABY',
	);

	$signal_names = array();
	foreach ($constant_names as $constant) {
	if (defined($constant)) {
	$signal_names[constant($constant)] = $constant;
	}
	}

	return idx($signal_names, $signo);
	}

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