141 lines
3.1 KiB
C++
141 lines
3.1 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2016 Danny Robson <danny@nerdcruft.net>
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*/
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#include "map.hpp"
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#include "posix/except.hpp"
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using util::posix::map;
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///////////////////////////////////////////////////////////////////////////////
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map::map (size_t size, int prot, int flags):
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m_addr (mmap (nullptr, size, prot, flags, -1, 0)),
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m_size (size)
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{
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if (MAP_FAILED == m_addr)
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::util::posix::error::throw_code ();
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}
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//-----------------------------------------------------------------------------
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map::map (size_t size, int prot, int flags, const fd &src, off_t offset):
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m_addr (mmap (nullptr, size, prot, flags, src, offset)),
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m_size (size)
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{
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if (MAP_FAILED == m_addr)
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::util::posix::error::throw_code ();
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}
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//-----------------------------------------------------------------------------
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map::map (map &&rhs):
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m_addr (MAP_FAILED),
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m_size (rhs.m_size)
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{
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std::swap (m_addr, rhs.m_addr);
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}
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//-----------------------------------------------------------------------------
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map::~map ()
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{
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if (MAP_FAILED == m_addr)
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return;
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if (munmap (m_addr, m_size))
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::util::posix::error::throw_code ();
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}
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//-----------------------------------------------------------------------------
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map&
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map::operator= (map &&rhs)
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{
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std::swap (m_addr, rhs.m_addr);
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std::swap (m_size, rhs.m_size);
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return *this;
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}
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///////////////////////////////////////////////////////////////////////////////
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uint8_t*
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map::begin (void)
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{
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return static_cast<uint8_t*> (m_addr);
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}
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//-----------------------------------------------------------------------------
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uint8_t*
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map::end (void)
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{
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return static_cast<uint8_t*> (m_addr) + m_size;
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}
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///////////////////////////////////////////////////////////////////////////////
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void*
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map::data (void)
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{
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return m_addr;
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}
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//-----------------------------------------------------------------------------
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const void*
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map::data (void) const
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{
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return m_addr;
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}
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///////////////////////////////////////////////////////////////////////////////
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bool
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map::empty (void) const
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{
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return size () == 0;
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}
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//-----------------------------------------------------------------------------
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size_t
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map::size (void) const
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{
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return m_size;
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}
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//-----------------------------------------------------------------------------
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void
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map::resize (size_t newsize, resize_t op)
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{
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int flags = 0;
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switch (op) {
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case resize_t::MOVE:
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flags = flags | MREMAP_MAYMOVE;
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break;
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case resize_t::NOMOVE:
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break;
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}
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auto res = mremap (m_addr, m_size, newsize, flags);
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if (res == MAP_FAILED)
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::util::posix::error::throw_code ();
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}
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