libcruft-util/memory/system.cpp

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/*
* 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.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#include "./system.hpp"
#include "../except.hpp"
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#include "../cast.hpp"
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#include <unistd.h>
///////////////////////////////////////////////////////////////////////////////
size_t
util::memory::pagesize (void)
{
static size_t val;
if (!val) {
auto res = sysconf (_SC_PAGE_SIZE);
if (res == -1)
errno_error::throw_code ();
val = sign_cast<unsigned long> (res);
}
return val;
}