CurrentProcess.php
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CurrentProcess.php
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	<?php
	declare(strict_types=1);

	namespace Keruald\OmniTools\OS;

	class CurrentProcess {

	/**
	* Determines if the current process, ie the PHP interpreter,
	* runs as root on UNIX systems or in elevated mode on Windows.
	*
	* Cygwin processes are considered as Windows processes.
	*/
	public static function isPrivileged () : bool {
	if (CurrentOS::isWindows()) {
	// `net session` is known to only work as privileged process.
	// To wrap in cmd allows avoiding /dev/null for Cygwin,
	// or $null when invoked from PowerShell. NUL: will always be used.
	exec('cmd /C "net session >NUL 2>&1"', $_, $exitCode);

	return $exitCode === 0;
	}

	if (!function_exists('posix_geteuid')) {
	// POSIX PHP functions aren't always available, e.g. on FreeBSD
	// In such cases, `id` will probably be available.
	return trim((string)shell_exec('id -u')) === '0';
	}

	return posix_geteuid() === 0;
	}

	/**
	* Determines the username of the current process, ie the PHP interpreter.
	*/
	public static function getUsername () : string {
	if (!extension_loaded("posix")) {
	// POSIX PHP functions aren't always available.
	// In such cases, `whoami` will probably be available.
	$username = trim((string)shell_exec("whoami"));

	if (CurrentOS::isWindows() && str_contains('\\', $username)) {
	// Perhaps the domain information could be useful if the user
	// can belong to an AD domain, to disambiguate between local
	// accounts and AD accounts.
	//
	// If not attached to a domain, the PC hostname is used.
	//
	// We return only the username part to be coherent with UNIX.
	return explode('\\', $username, 2)[1];
	}

	return $username;
	}

	return posix_getpwuid(posix_geteuid())["name"];
	}

	}

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