TProcessHelper::setProcessPriority() - Code Metrics - Inspection of "#972 TProcessHelper, TSignalsDispatcher, and relat..." - pradosoft/prado - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 032384...6ce998 )

by Fabio

created 2023-08-01 07:19 UTC

TProcessHelper::setProcessPriority() B

↳ Parent: TProcessHelper

Complexity

Conditions	11
Paths	28

Size

Total Lines	49
Code Lines	29

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	11
eloc	29
nc	28
nop	2
dl	0
loc	49
rs	7.3166
c	0
b	0
f	0

How to fix Complexity

<?php
/**
 * TProcessHelper class file
 *
 * @author Brad Anderson <[email protected]>
 * @link https://github.com/pradosoft/prado
 * @license https://github.com/pradosoft/prado/blob/master/LICENSE
 */

namespace Prado\Util\Helpers;

use Prado\Exceptions\TNotSupportedException;
use Prado\Prado;
filter:
    dependency_paths: ["lib/*"]
use Prado\TComponent;
use Prado\TEventParameter;
use Prado\Util\Behaviors\TCaptureForkLog;
use Prado\Util\TSignalsDispatcher;
filter:
    dependency_paths: ["lib/*"]

/**
 * TProcessHelper class.
 *
 * This class handles process related functions.
 *
 * {@see self::isSystemWindows()} is used to determine if the PHP system is Windows
 * or not.
 *
 * {@see self::isForkable()} can be used if the system supports forking of the current
 * process.  {@see self::fork()} is used to fork the current process, where supported.
 * When forking, `fxPrepareForFork` {@see self::FX_PREPARE_FOR_FORK} is raised before
 * forking and `fxRestoreAfterFork` {@see self::FX_RESTORE_AFTER_FORK} is raised after
 * forking.  When $captureForkLog (fork parameter) is true, a {@see \Prado\Util\Behaviors\TCaptureForkLog}
 * behavior is attached to the {@see \Prado\TApplication} object.  All forked child
 * processes ensure the {@see \Prado\Util\TSignalsDispatcher} behavior is attached
 * to the TApplication object to allow for graceful termination on exiting signals.
 *
 * When filtering commands for popen and proc_open, {@see self::filterCommand()} will
 * replace '@php' with PHP_BINARY and wrap Windows commands with double quotes.
 * Individual arguments can be properly shell escaped with {@see self::escapeShellArg()}.
 *
 * Linux Process signals can be sent with {@see self::sendSignal()} to the current
 * pid or child pid.  To kill a child pid, call {@see self::kill()}.  {@see self::isRunning}
 * can determine if a child process is still running.
 *
 * System Process priority can be retrieved and set with {@see self::getProcessPriority()}
 * and {@see self::setProcessPriority()}, respectively.
 *
 * @author Brad Anderson <[email protected]>
 * @since 4.2.3
 */
class TProcessHelper
{
	/** @var string When running a Pipe or Process, this is replaced with PHP_BINARY */
	public const PHP_COMMAND = "@php";

	/** @var string The global event prior to forking a process. */
	public const FX_PREPARE_FOR_FORK = 'fxPrepareForFork';

	/** @var string The global event after forking a process. */
	public const FX_RESTORE_AFTER_FORK = 'fxRestoreAfterFork';

	/**
	 * Linux priority is -20 (for "real time") to 19 (for idle).
	 * The WINDOWS_*_PRIORITY is what the windows priority would map into the PRADO
	 * and linux priority numbering.  Windows will only have these priorities.
	 */
	public const WINDOWS_IDLE_PRIORITY = 19;
	public const WINDOWS_BELOW_NORMAL_PRIORITY = 8;
	public const WINDOWS_NORMAL_PRIORITY = 0;
	public const WINDOWS_ABOVE_NORMAL_PRIORITY = -5;
	public const WINDOWS_HIGH_PRIORITY = -10;
	public const WINDOWS_REALTIME_PRIORITY = -17;

	/**
	 * Checks if the system that PHP is run on is Windows.
	 * @return bool Is the system Windows.
	 */
	public static function isSystemWindows(): bool
	{
		static $isWindows = null;
		if ($isWindows === null) {
			$isWindows = strncasecmp(php_uname('s'), 'win', 3) === 0;
		}
		return $isWindows;
	}

	/**
	 * Checks if the system that PHP is run on is MacOS (Darwin).
	 * @return bool Is the system MacOS (Darwin).
	 */
	public static function isSystemMacOS(): bool
	{
		static $isDarwin = null;
		if ($isDarwin === null) {
			$isDarwin = strncasecmp(php_uname('s'), 'darwin', 6) === 0;
		}
		return $isDarwin;
	}

	/**
	 * Checks if the system that PHP is run on is Linux.
	 * @return bool Is the system Linux.
	 */
	public static function isSystemLinux(): bool
	{
		static $isLinux = null;
		if ($isLinux === null) {
			$isLinux = strncasecmp(php_uname('s'), 'linux', 5) === 0;
		}
		return $isLinux;
	}

	/**
	 * @return bool Can PHP fork the process.
	 */
	public static function isForkable(): bool
	{
		return function_exists('pcntl_fork');
	}

	/**
	 * This forks the current process.  When specified, it will install a {@see \Prado\Util\Behaviors\TCaptureForkLog}.
	 * Before forking, `fxPrepareForFork` is raised and after forking `fxRestoreAfterFork` is raised.
	 *
	 * `fxPrepareForFork` handlers should return null or an array of data that it will
	 * receive in `fxRestoreAfterFork`.
	 * ```php
	 *	public function fxPrepareForFork ($sender, $param) {
	 *		return ['mydata' => 'value'];
	 *	}
	 *
	 *	public function fxRestoreAfterFork ($sender, $param) {
	 *		$param['mydata'] === 'value';
	 *		$param['pid'];
	 *	}
	 * ```
	 * @param bool $captureForkLog Installs {@see \Prado\Util\Behaviors\TCaptureForkLog} behavior on the application
	 *  so the fork log is stored by the forking process.  Default false.
	 * @throws TNotSupportedException When PHP Forking `pcntl_fork` is not supporting
	 * @return int The Child Process ID.  For children processes, they receive 0.  Failure is -1.
	 */
	public static function fork(bool $captureForkLog = false): int
	{
		if (!static::isForkable()) {
			throw new TNotSupportedException('processhelper_no_forking');
		}
		$app = Prado::getApplication();
		if ($captureForkLog && !$app->asa(TCaptureForkLog::class)) {
			$app->attachBehavior(TCaptureForkLog::BEHAVIOR_NAME, TCaptureForkLog::class);
		}
		$responses = $app->raiseEvent(static::FX_PREPARE_FOR_FORK, $app, null);
		$restore = array_merge(...$responses);
		$restore['pid'] = $pid = pcntl_fork();
		$app->raiseEvent(static::FX_RESTORE_AFTER_FORK, $app, $restore);
		if ($pid > 0) {
			Prado::info("Fork child: $pid", static::class);
		} elseif ($pid === 0) {
			Prado::info("Executing child fork", static::class);
			TSignalsDispatcher::singleton();
		} elseif ($pid === -1) {
			Prado::notice("failed fork", static::class);
		}
		return $pid;
	}

	/**
	 * If the exitCode is an exit code, returns the exit Status.
	 * @param int $exitCode
	 * @return int The exit Status
	 */
	public static function exitStatus(int $exitCode): int
	{
		if (function_exists('pcntl_wifexited') && pcntl_wifexited($exitCode)) {
			$exitCode = pcntl_wexitstatus($exitCode);
		}
		return $exitCode;
	}

	/**
	 * Filters a {@see popen} or {@see proc_open} command.
	 * The string "@php" is replaced by {@see PHP_BINARY} and in Windows the string
	 * is surrounded by double quotes.
	 *
	 * @param mixed $command
	 */
	public static function filterCommand($command)
	{
		$command = str_replace(static::PHP_COMMAND, PHP_BINARY, $command);

		if (TProcessHelper::isSystemWindows()) {
			if (is_string($command)) {
				$command = '"' . $command . '"';  //Windows, better command support
			}
		}
		return $command;
	}

	/**
	 * Sends a process signal on posix or linux systems.
	 * @param int $signal The signal to be sent.
	 * @param ?int $pid The process to send the signal, default null for the current
	 *   process.
	 * @throws TNotSupportedException When running on Windows.
	 */
	public static function sendSignal(int $signal, ?int $pid = null): bool
	{
		if (static::isSystemWindows()) {
			throw new TNotSupportedException('processhelper_no_signals');
		}
		if ($pid === null) {
			$pid = getmypid();
		}
		if (function_exists("posix_kill")) {
			return posix_kill($pid, $signal);
		}
		exec("/usr/bin/kill -s $signal $pid 2>&1", $output, $return_code);
		return !$return_code;
	}

	/**
	 * Kills a process.
	 * @param int $pid The PID to kill.
	 * @return bool Was the signal successfully sent.
	 */
	public static function kill(int $pid): bool
	{
		if (static::isSystemWindows()) {
			return shell_exec("taskkill /F /PID $pid") !== null;
		}
		return static::sendSignal(SIGKILL, $pid);
	}

	/**
	 * @param int $pid The Process ID to check if it is running.
	 * @return bool Is the PID running.
	 */
	public static function isRunning(int $pid): bool
	{
		if (static::isSystemWindows()) {
			$out = [];
			exec("TASKLIST /FO LIST /FI \"PID eq $pid\"", $out);
			return count($out) > 1;
		}

		return static::sendSignal(0, $pid);
	}

	/**
	 * @param ?int $pid The process id to get the priority of, default null for current
	 *   process.
	 * @return ?int The priority of the process.
	 */
	public static function getProcessPriority(?int $pid = null): ?int
	{
		if ($pid === null) {
			$pid = getmypid();
		}
		if (static::isSystemWindows()) {
			$output = shell_exec("wmic process where ProcessId={$pid} get priority");
			preg_match('/^\s*Priority\s*\r?\n\s*(\d+)/m', $output, $matches);
			if (isset($matches[1])) {
				$priorityValues = [ // Map Windows Priority Numbers to Linux style Numbers
					TProcessWindowsPriority::Idle => static::WINDOWS_IDLE_PRIORITY,
					TProcessWindowsPriority::BelowNormal => static::WINDOWS_BELOW_NORMAL_PRIORITY,
					TProcessWindowsPriority::Normal => static::WINDOWS_NORMAL_PRIORITY,
					TProcessWindowsPriority::AboveNormal => static::WINDOWS_ABOVE_NORMAL_PRIORITY,
					TProcessWindowsPriority::HighPriority => static::WINDOWS_HIGH_PRIORITY,
					TProcessWindowsPriority::Realtime => static::WINDOWS_REALTIME_PRIORITY,
				];
				return $priorityValues[$matches[1]] ?? null;
			} else {
				return null;
			}
		} else {
			if (strlen($priority = trim(shell_exec('exec ps -o nice= -p ' . $pid)))) {
				return (int) $priority;
			}
			return null;
		}
	}

	/**
	 * In linux systems, the priority can only go up (and have less priority).
	 * @param int $priority The priority of the PID.
	 * @param ?int $pid The PID to change the priority, default null for current process.
	 * @return bool Was successful.
	 */
	public static function setProcessPriority(int $priority, ?int $pid = null): bool
	{
		if ($pid === null) {
			$pid = getmypid();
		}
		if (static::isSystemWindows()) {
			$priorityValues = [ // The priority cap to windows text priority.
				-15 => TProcessWindowsPriorityName::Realtime,
				-10 => TProcessWindowsPriorityName::HighPriority,
				-5 => TProcessWindowsPriorityName::AboveNormal,
				4 => TProcessWindowsPriorityName::Normal,
				9 => TProcessWindowsPriorityName::BelowNormal,
				PHP_INT_MAX => TProcessWindowsPriorityName::Idle,
			];
			foreach($priorityValues as $keyPriority => $priorityName) {
				if ($priority <= $keyPriority) {
					break;
				}
			}
			$command = "wmic process where ProcessId={$pid} CALL setpriority \"$priorityName\"";

			$result = shell_exec($command);
			if (strpos($result, 'successful') !== false) {
				return true;
			}
			if (!preg_match('/ReturnValue\s*=\s*(\d+);/m', $result, $matches)) {
				return false;
			}
			return $matches[1] === 0;
		} else {
			if (static::isSystemMacOS()) {
				if (($pp = static::getProcessPriority($pid)) === null) {
					return false;
				}

				$priority -= $pp;
			}

			$result = shell_exec("exec renice -n $priority -p $pid");

			// On MacOS, working properly consists of returning nothing.
			//	only errors return "renice: 40812: setpriority: Permission denied" (when lowering priority without permission)
			//		(Lowering the priority is increasing its importance)
			// On the github linux test system it return "3539 (process ID) old priority 0, new priority 8"
			//	for an error, it return: "renice: failed to set priority for 3612 (process ID): Permission denied"
			if (is_string($result) && str_contains($result, 'denied')) {
				return false;
			}

			return true;
		}
	}

	/**
	 * Escapes a string to be used as a shell argument.
	 * @param string $argument
	 * @return string
	 */
	public static function escapeShellArg(string $argument): string
	{
		// Fix for PHP bug #43784 escapeshellarg removes % from given string
		// Fix for PHP bug #49446 escapeshellarg doesn't work on Windows
		// @see https://bugs.php.net/bug.php?id=43784
		// @see https://bugs.php.net/bug.php?id=49446
		if (static::isSystemWindows()) {
			if ($argument === '') {
				return '""';
			}

			$escapedArgument = '';
			$addQuote = false;

			foreach (preg_split('/(")/', $argument, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE) as $part) {
				if ($part === '"') {
					$escapedArgument .= '\\"';
				} elseif (static::isSurroundedBy($part, '%')) {
					// environment variables
					$escapedArgument .= '^%"' . substr($part, 1, -1) . '"^%';
				} else {
					// escape trailing backslash
					if (str_ends_with($part, '\\')) {
						$part .= '\\';
					}
					$addQuote = true;
					$escapedArgument .= $part;
				}
			}

			if ($addQuote) {

				$escapedArgument = '"' . $escapedArgument . '"';
			}

			return $escapedArgument;
		}

		return "'" . str_replace("'", "'\\''", $argument) . "'";
	}

	/**
	 * Is the string surrounded by the prefix and reversed in appendix.
	 * @param string $string
	 * @param string $prefix
	 * @return bool Is the string surrounded by the string
	 */
	public static function isSurroundedBy(string $string, string $prefix): bool
	{
		$len = strlen($prefix);
		return strlen($string) >= 2 * $len && str_starts_with($string, $prefix) && str_ends_with($string, strrev($prefix));
	}
}


1			<?php
2			/**
3			* TProcessHelper class file
4			*
5			* @author Brad Anderson <[email protected]>
6			* @link https://github.com/pradosoft/prado
7			* @license https://github.com/pradosoft/prado/blob/master/LICENSE
8			*/
9
10			namespace Prado\Util\Helpers;
11
12			use Prado\Exceptions\TNotSupportedException;
13			use Prado\Prado;
			0 ignored issues – show Bug introduced 2023-07-24 19:53 UTC by Report Bug Copy Issue Report The type `Prado\Prado` was not found. Maybe you did not declare it correctly or list all dependencies? The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g. `excluded_paths: ["lib/"]`, you can move it to the dependency path list as follows: filter: dependency_paths: ["lib/"] For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths Loading history...
14			use Prado\TComponent;
15			use Prado\TEventParameter;
16			use Prado\Util\Behaviors\TCaptureForkLog;
17			use Prado\Util\TSignalsDispatcher;
			0 ignored issues – show Bug introduced 2023-07-24 19:53 UTC by Report Bug Copy Issue Report The type `Prado\Util\TSignalsDispatcher` was not found. Maybe you did not declare it correctly or list all dependencies? The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g. `excluded_paths: ["lib/"]`, you can move it to the dependency path list as follows: filter: dependency_paths: ["lib/"] For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths Loading history...
18
19			/**
20			* TProcessHelper class.
21			*
22			* This class handles process related functions.
23			*
24			* {@see self::isSystemWindows()} is used to determine if the PHP system is Windows
25			* or not.
26			*
27			* {@see self::isForkable()} can be used if the system supports forking of the current
28			* process. {@see self::fork()} is used to fork the current process, where supported.
29			* When forking, `fxPrepareForFork` {@see self::FX_PREPARE_FOR_FORK} is raised before
30			* forking and `fxRestoreAfterFork` {@see self::FX_RESTORE_AFTER_FORK} is raised after
31			* forking. When $captureForkLog (fork parameter) is true, a {@see \Prado\Util\Behaviors\TCaptureForkLog}
32			* behavior is attached to the {@see \Prado\TApplication} object. All forked child
33			* processes ensure the {@see \Prado\Util\TSignalsDispatcher} behavior is attached
34			* to the TApplication object to allow for graceful termination on exiting signals.
35			*
36			* When filtering commands for popen and proc_open, {@see self::filterCommand()} will
37			* replace '@php' with PHP_BINARY and wrap Windows commands with double quotes.
38			* Individual arguments can be properly shell escaped with {@see self::escapeShellArg()}.
39			*
40			* Linux Process signals can be sent with {@see self::sendSignal()} to the current
41			* pid or child pid. To kill a child pid, call {@see self::kill()}. {@see self::isRunning}
42			* can determine if a child process is still running.
43			*
44			* System Process priority can be retrieved and set with {@see self::getProcessPriority()}
45			* and {@see self::setProcessPriority()}, respectively.
46			*
47			* @author Brad Anderson <[email protected]>
48			* @since 4.2.3
49			*/
50			class TProcessHelper
51			{
52			/** @var string When running a Pipe or Process, this is replaced with PHP_BINARY */
53			public const PHP_COMMAND = "@php";
54
55			/** @var string The global event prior to forking a process. */
56			public const FX_PREPARE_FOR_FORK = 'fxPrepareForFork';
57
58			/** @var string The global event after forking a process. */
59			public const FX_RESTORE_AFTER_FORK = 'fxRestoreAfterFork';
60
61			/**
62			* Linux priority is -20 (for "real time") to 19 (for idle).
63			* The WINDOWS_*_PRIORITY is what the windows priority would map into the PRADO
64			* and linux priority numbering. Windows will only have these priorities.
65			*/
66			public const WINDOWS_IDLE_PRIORITY = 19;
67			public const WINDOWS_BELOW_NORMAL_PRIORITY = 8;
68			public const WINDOWS_NORMAL_PRIORITY = 0;
69			public const WINDOWS_ABOVE_NORMAL_PRIORITY = -5;
70			public const WINDOWS_HIGH_PRIORITY = -10;
71			public const WINDOWS_REALTIME_PRIORITY = -17;
72
73			/**
74			* Checks if the system that PHP is run on is Windows.
75			* @return bool Is the system Windows.
76			*/
77			public static function isSystemWindows(): bool
78			{
79			static $isWindows = null;
80			if ($isWindows === null) {
81			$isWindows = strncasecmp(php_uname('s'), 'win', 3) === 0;
82			}
83			return $isWindows;
84			}
85
86			/**
87			* Checks if the system that PHP is run on is MacOS (Darwin).
88			* @return bool Is the system MacOS (Darwin).
89			*/
90			public static function isSystemMacOS(): bool
91			{
92			static $isDarwin = null;
93			if ($isDarwin === null) {
94			$isDarwin = strncasecmp(php_uname('s'), 'darwin', 6) === 0;
95			}
96			return $isDarwin;
97			}
98
99			/**
100			* Checks if the system that PHP is run on is Linux.
101			* @return bool Is the system Linux.
102			*/
103			public static function isSystemLinux(): bool
104			{
105			static $isLinux = null;
106			if ($isLinux === null) {
107			$isLinux = strncasecmp(php_uname('s'), 'linux', 5) === 0;
108			}
109			return $isLinux;
110			}
111
112			/**
113			* @return bool Can PHP fork the process.
114			*/
115			public static function isForkable(): bool
116			{
117			return function_exists('pcntl_fork');
118			}
119
120			/**
121			* This forks the current process. When specified, it will install a {@see \Prado\Util\Behaviors\TCaptureForkLog}.
122			* Before forking, `fxPrepareForFork` is raised and after forking `fxRestoreAfterFork` is raised.
123			*
124			* `fxPrepareForFork` handlers should return null or an array of data that it will
125			* receive in `fxRestoreAfterFork`.
126			* ```php
127			* public function fxPrepareForFork ($sender, $param) {
128			* return ['mydata' => 'value'];
129			* }
130			*
131			* public function fxRestoreAfterFork ($sender, $param) {
132			* $param['mydata'] === 'value';
133			* $param['pid'];
134			* }
135			* ```
136			* @param bool $captureForkLog Installs {@see \Prado\Util\Behaviors\TCaptureForkLog} behavior on the application
137			* so the fork log is stored by the forking process. Default false.
138			* @throws TNotSupportedException When PHP Forking `pcntl_fork` is not supporting
139			* @return int The Child Process ID. For children processes, they receive 0. Failure is -1.
140			*/
141			public static function fork(bool $captureForkLog = false): int
142			{
143			if (!static::isForkable()) {
144			throw new TNotSupportedException('processhelper_no_forking');
145			}
146			$app = Prado::getApplication();
147			if ($captureForkLog && !$app->asa(TCaptureForkLog::class)) {
148			$app->attachBehavior(TCaptureForkLog::BEHAVIOR_NAME, TCaptureForkLog::class);
149			}
150			$responses = $app->raiseEvent(static::FX_PREPARE_FOR_FORK, $app, null);
151			$restore = array_merge(...$responses);
152			$restore['pid'] = $pid = pcntl_fork();
153			$app->raiseEvent(static::FX_RESTORE_AFTER_FORK, $app, $restore);
154			if ($pid > 0) {
155			Prado::info("Fork child: $pid", static::class);
156			} elseif ($pid === 0) {
157			Prado::info("Executing child fork", static::class);
158			TSignalsDispatcher::singleton();
159			} elseif ($pid === -1) {
160			Prado::notice("failed fork", static::class);
161			}
162			return $pid;
163			}
164
165			/**
166			* If the exitCode is an exit code, returns the exit Status.
167			* @param int $exitCode
168			* @return int The exit Status
169			*/
170			public static function exitStatus(int $exitCode): int
171			{
172			if (function_exists('pcntl_wifexited') && pcntl_wifexited($exitCode)) {
173			$exitCode = pcntl_wexitstatus($exitCode);
174			}
175			return $exitCode;
176			}
177
178			/**
179			* Filters a {@see popen} or {@see proc_open} command.
180			* The string "@php" is replaced by {@see PHP_BINARY} and in Windows the string
181			* is surrounded by double quotes.
182			*
183			* @param mixed $command
184			*/
185			public static function filterCommand($command)
186			{
187			$command = str_replace(static::PHP_COMMAND, PHP_BINARY, $command);
188
189			if (TProcessHelper::isSystemWindows()) {
190			if (is_string($command)) {
191			$command = '"' . $command . '"'; //Windows, better command support
192			}
193			}
194			return $command;
195			}
196
197			/**
198			* Sends a process signal on posix or linux systems.
199			* @param int $signal The signal to be sent.
200			* @param ?int $pid The process to send the signal, default null for the current
201			* process.
202			* @throws TNotSupportedException When running on Windows.
203			*/
204			public static function sendSignal(int $signal, ?int $pid = null): bool
205			{
206			if (static::isSystemWindows()) {
207			throw new TNotSupportedException('processhelper_no_signals');
208			}
209			if ($pid === null) {
210			$pid = getmypid();
211			}
212			if (function_exists("posix_kill")) {
213			return posix_kill($pid, $signal);
214			}
215			exec("/usr/bin/kill -s $signal $pid 2>&1", $output, $return_code);
216			return !$return_code;
217			}
218
219			/**
220			* Kills a process.
221			* @param int $pid The PID to kill.
222			* @return bool Was the signal successfully sent.
223			*/
224			public static function kill(int $pid): bool
225			{
226			if (static::isSystemWindows()) {
227			return shell_exec("taskkill /F /PID $pid") !== null;
228			}
229			return static::sendSignal(SIGKILL, $pid);
230			}
231
232			/**
233			* @param int $pid The Process ID to check if it is running.
234			* @return bool Is the PID running.
235			*/
236			public static function isRunning(int $pid): bool
237			{
238			if (static::isSystemWindows()) {
239			$out = [];
240			exec("TASKLIST /FO LIST /FI \"PID eq $pid\"", $out);
241			return count($out) > 1;
242			}
243
244			return static::sendSignal(0, $pid);
245			}
246
247			/**
248			* @param ?int $pid The process id to get the priority of, default null for current
249			* process.
250			* @return ?int The priority of the process.
251			*/
252			public static function getProcessPriority(?int $pid = null): ?int
253			{
254			if ($pid === null) {
255			$pid = getmypid();
256			}
257			if (static::isSystemWindows()) {
258			$output = shell_exec("wmic process where ProcessId={$pid} get priority");
259			preg_match('/^\sPriority\s\r?\n\s*(\d+)/m', $output, $matches);
260			if (isset($matches[1])) {
261			$priorityValues = [ // Map Windows Priority Numbers to Linux style Numbers
262			TProcessWindowsPriority::Idle => static::WINDOWS_IDLE_PRIORITY,
263			TProcessWindowsPriority::BelowNormal => static::WINDOWS_BELOW_NORMAL_PRIORITY,
264			TProcessWindowsPriority::Normal => static::WINDOWS_NORMAL_PRIORITY,
265			TProcessWindowsPriority::AboveNormal => static::WINDOWS_ABOVE_NORMAL_PRIORITY,
266			TProcessWindowsPriority::HighPriority => static::WINDOWS_HIGH_PRIORITY,
267			TProcessWindowsPriority::Realtime => static::WINDOWS_REALTIME_PRIORITY,
268			];
269			return $priorityValues[$matches[1]] ?? null;
270			} else {
271			return null;
272			}
273			} else {
274			if (strlen($priority = trim(shell_exec('exec ps -o nice= -p ' . $pid)))) {
275			return (int) $priority;
276			}
277			return null;
278			}
279			}
280
281			/**
282			* In linux systems, the priority can only go up (and have less priority).
283			* @param int $priority The priority of the PID.
284			* @param ?int $pid The PID to change the priority, default null for current process.
285			* @return bool Was successful.
286			*/
287			public static function setProcessPriority(int $priority, ?int $pid = null): bool
288			{
289			if ($pid === null) {
290			$pid = getmypid();
291			}
292			if (static::isSystemWindows()) {
293			$priorityValues = [ // The priority cap to windows text priority.
294			-15 => TProcessWindowsPriorityName::Realtime,
295			-10 => TProcessWindowsPriorityName::HighPriority,
296			-5 => TProcessWindowsPriorityName::AboveNormal,
297			4 => TProcessWindowsPriorityName::Normal,
298			9 => TProcessWindowsPriorityName::BelowNormal,
299			PHP_INT_MAX => TProcessWindowsPriorityName::Idle,
300			];
301			foreach($priorityValues as $keyPriority => $priorityName) {
302			if ($priority <= $keyPriority) {
303			break;
304			}
305			}
306			$command = "wmic process where ProcessId={$pid} CALL setpriority \"$priorityName\"";
			0 ignored issues – show Comprehensibility Best Practice introduced 2023-07-24 19:53 UTC by Report Bug Copy Issue Report The variable `$priorityName` seems to be defined by a `foreach` iteration on line `301`. Are you sure the iterator is never empty, otherwise this variable is not defined? Loading history...
307			$result = shell_exec($command);
308			if (strpos($result, 'successful') !== false) {
309			return true;
310			}
311			if (!preg_match('/ReturnValue\s=\s(\d+);/m', $result, $matches)) {
312			return false;
313			}
314			return $matches[1] === 0;
315			} else {
316			if (static::isSystemMacOS()) {
317			if (($pp = static::getProcessPriority($pid)) === null) {
318			return false;
319			}
320
321			$priority -= $pp;
322			}
323
324			$result = shell_exec("exec renice -n $priority -p $pid");
325
326			// On MacOS, working properly consists of returning nothing.
327			// only errors return "renice: 40812: setpriority: Permission denied" (when lowering priority without permission)
328			// (Lowering the priority is increasing its importance)
329			// On the github linux test system it return "3539 (process ID) old priority 0, new priority 8"
330			// for an error, it return: "renice: failed to set priority for 3612 (process ID): Permission denied"
331			if (is_string($result) && str_contains($result, 'denied')) {
332			return false;
333			}
334
335			return true;
336			}
337			}
338
339			/**
340			* Escapes a string to be used as a shell argument.
341			* @param string $argument
342			* @return string
343			*/
344			public static function escapeShellArg(string $argument): string
345			{
346			// Fix for PHP bug #43784 escapeshellarg removes % from given string
347			// Fix for PHP bug #49446 escapeshellarg doesn't work on Windows
348			// @see https://bugs.php.net/bug.php?id=43784
349			// @see https://bugs.php.net/bug.php?id=49446
350			if (static::isSystemWindows()) {
351			if ($argument === '') {
352			return '""';
353			}
354
355			$escapedArgument = '';
356			$addQuote = false;
357
358			foreach (preg_split('/(")/', $argument, -1, PREG_SPLIT_NO_EMPTY \| PREG_SPLIT_DELIM_CAPTURE) as $part) {
359			if ($part === '"') {
360			$escapedArgument .= '\\"';
361			} elseif (static::isSurroundedBy($part, '%')) {
362			// environment variables
363			$escapedArgument .= '^%"' . substr($part, 1, -1) . '"^%';
364			} else {
365			// escape trailing backslash
366			if (str_ends_with($part, '\\')) {
367			$part .= '\\';
368			}
369			$addQuote = true;
370			$escapedArgument .= $part;
371			}
372			}
373
374			if ($addQuote) {
			0 ignored issues – show introduced 2023-07-24 19:53 UTC by Report Bug Copy Issue Report The condition `$addQuote` is always `false`. Loading history...
375			$escapedArgument = '"' . $escapedArgument . '"';
376			}
377
378			return $escapedArgument;
379			}
380
381			return "'" . str_replace("'", "'\\''", $argument) . "'";
382			}
383
384			/**
385			* Is the string surrounded by the prefix and reversed in appendix.
386			* @param string $string
387			* @param string $prefix
388			* @return bool Is the string surrounded by the string
389			*/
390			public static function isSurroundedBy(string $string, string $prefix): bool
391			{
392			$len = strlen($prefix);
393			return strlen($string) >= 2 * $len && str_starts_with($string, $prefix) && str_ends_with($string, strrev($prefix));
394			}
395			}
396

pradosoft / prado

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TProcessHelper::setProcessPriority() B

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