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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/platform/stack_locator.h"
#include <pthread.h>
#include <pthread_np.h>
#include "mongo/util/assert_util.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
StackLocator::StackLocator() {
pthread_attr_t attr;
size_t size;
pthread_t self = pthread_self();
invariant(pthread_attr_init(&attr) == 0);
ON_BLOCK_EXIT([&] { pthread_attr_destroy(&attr); });
invariant(pthread_attr_get_np(self, &attr) == 0);
invariant(pthread_attr_getstack(&attr, &_end, &size) == 0);
// TODO: Assumes stack grows downward on FreeBSD
_begin = static_cast<char*>(_end) + size;
}
} // namespace mongo
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