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<?php
/**
* Copyright 2017 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace Google\Cloud\Core;
/**
* A utility trait related to System V IPC.
*
* @experimental The experimental flag means that while we believe this method
* or class is ready for use, it may change before release in backwards-
* incompatible ways. Please use with caution, and test thoroughly when
* upgrading.
*/
trait SysvTrait
{
private static $productionKey = 'P';
private static $typeDirect = 1;
private static $typeFile = 2;
/**
* Create a SystemV IPC key for the given id number.
*
* Set GOOGLE_CLOUD_SYSV_ID envvar to change the base id.
*
* @param int $idNum An id number.
* @return int
*/
private function getSysvKey($idNum)
{
$key = getenv('GOOGLE_CLOUD_SYSV_ID') ?: self::$productionKey;
$base = ftok(__FILE__, $key);
if ($base == PHP_INT_MAX) {
$base = 1;
}
return $base + $idNum;
}
/**
* Determine whether the SystemV IPC extension family is loaded.
*
* @return bool
*/
private function isSysvIPCLoaded()
{
return extension_loaded('sysvmsg')
&& extension_loaded('sysvsem')
&& extension_loaded('sysvshm');
}
}
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