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157 lines
4.0 KiB
C++
157 lines
4.0 KiB
C++
//
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// SharedMemoryImpl.cpp
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//
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// $Id: //poco/svn/Foundation/src/SharedMemory_POSIX.cpp#2 $
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//
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// Library: Foundation
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// Package: Processes
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// Module: SharedMemoryImpl
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//
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// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/SharedMemory_POSIX.h"
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#include "Poco/Exception.h"
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#include "Poco/File.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <unistd.h>
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namespace Poco {
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SharedMemoryImpl::SharedMemoryImpl(const std::string& name, std::size_t size, SharedMemory::AccessMode mode, const void* addrHint, bool server):
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_size(size),
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_fd(-1),
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_address(0),
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_access(mode),
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_name("/"),
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_fileMapped(false),
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_server(server)
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{
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#if POCO_OS == POCO_OS_HPUX
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_name.append("tmp/");
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#endif
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_name.append(name);
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int flags = _server ? O_CREAT : 0;
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if (_access == SharedMemory::AM_WRITE)
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flags |= O_RDWR;
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else
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flags |= O_RDONLY;
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// open the shared memory segment
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_fd = ::shm_open(_name.c_str(), flags, S_IRUSR | S_IWUSR);
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if (_fd == -1)
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throw SystemException("Cannot create shared memory object", _name);
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// now set the correct size for the segment
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if (_server && -1 == ::ftruncate(_fd, size))
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{
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::close(_fd);
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_fd = -1;
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::shm_unlink(_name.c_str());
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throw SystemException("Cannot resize shared memory object", _name);
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}
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map(addrHint);
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}
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SharedMemoryImpl::SharedMemoryImpl(const Poco::File& file, SharedMemory::AccessMode mode, const void* addrHint):
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_size(0),
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_fd(-1),
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_address(0),
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_access(mode),
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_name(file.path()),
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_fileMapped(true),
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_server(false)
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{
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if (!file.exists() || !file.isFile())
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throw FileNotFoundException(file.path());
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_size = file.getSize();
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int flag = O_RDONLY;
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if (mode == SharedMemory::AM_WRITE)
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flag = O_RDWR;
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_fd = ::open(_name.c_str(), flag);
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if (-1 == _fd)
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throw OpenFileException("Cannot open memory mapped file", _name);
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map(addrHint);
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}
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SharedMemoryImpl::~SharedMemoryImpl()
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{
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unmap();
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close();
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}
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void SharedMemoryImpl::map(const void* addrHint)
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{
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int access = PROT_READ;
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if (_access == SharedMemory::AM_WRITE)
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access |= PROT_WRITE;
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void* addr = ::mmap(const_cast<void*>(addrHint), _size, access, MAP_SHARED, _fd, 0);
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if (addr == MAP_FAILED)
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throw SystemException("Cannot map file into shared memory", _name);
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_address = static_cast<char*>(addr);
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}
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void SharedMemoryImpl::unmap()
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{
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if (_address)
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{
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::munmap(_address, _size);
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}
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}
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void SharedMemoryImpl::close()
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{
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if (_fd != -1)
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{
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::close(_fd);
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_fd = -1;
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}
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if (!_fileMapped && _server)
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{
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::shm_unlink(_name.c_str());
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}
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}
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} // namespace Poco
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