/usr/include/Poco/SharedMemory.h is in libpoco-dev 1.3.6p1-5+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | //
// SharedMemory.h
//
// $Id: //poco/1.3/Foundation/include/Poco/SharedMemory.h#2 $
//
// Library: Foundation
// Package: Processes
// Module: SharedMemory
//
// Definition of the SharedMemory class.
//
// Copyright (c) 2007, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_SharedMemory_INCLUDED
#define Foundation_SharedMemory_INCLUDED
#include "Poco/Foundation.h"
#include <algorithm>
#include <cstddef>
namespace Poco {
class SharedMemoryImpl;
class File;
class Foundation_API SharedMemory
/// Create and manage a shared memory object.
///
/// A SharedMemory object has value semantics, but
/// is implemented using a handle/implementation idiom.
/// Therefore, multiple SharedMemory objects can share
/// a single, reference counted SharedMemoryImpl object.
{
public:
enum AccessMode
{
AM_READ = 0,
AM_WRITE
};
SharedMemory();
/// Default constructor creates an unmapped SharedMemory object.
/// No clients can connect to an unmapped SharedMemory object.
SharedMemory(const std::string& name, std::size_t size, AccessMode mode, const void* addrHint = 0, bool server = true);
/// Creates or connects to a shared memory object with the given name.
///
/// For maximum portability, name should be a valid Unix filename and not
/// contain any slashes or backslashes.
///
/// An address hint can be passed to the system, specifying the desired
/// start address of the shared memory area. Whether the hint
/// is actually honored is, however, up to the system. Windows platform
/// will generally ignore the hint.
///
/// If server is set to false, the shared memory region will be unlinked
/// by calling shm_unlink (on POSIX platforms) when the SharedMemory object is destroyed.
/// The server parameter is ignored on Windows platforms.
SharedMemory(const File& file, AccessMode mode, const void* addrHint = 0);
/// Maps the entire contents of file into a shared memory segment.
///
/// An address hint can be passed to the system, specifying the desired
/// start address of the shared memory area. Whether the hint
/// is actually honored is, however, up to the system. Windows platform
/// will generally ignore the hint.
SharedMemory(const SharedMemory& other);
/// Creates a SharedMemory object by copying another one.
~SharedMemory();
/// Destroys the SharedMemory.
SharedMemory& operator = (const SharedMemory& other);
/// Assigns another SharedMemory object.
void swap(SharedMemory& other);
/// Swaps the SharedMemory object with another one.
char* begin() const;
/// Returns the start address of the shared memory segment.
/// Will be NULL for illegal segments.
char* end() const;
/// Returns the one-past-end end address of the shared memory segment.
/// Will be NULL for illegal segments.
private:
SharedMemoryImpl* _pImpl;
};
//
// inlines
//
inline void SharedMemory::swap(SharedMemory& other)
{
using std::swap;
swap(_pImpl, other._pImpl);
}
} // namespace Poco::Poco
#endif // Foundation_SharedMemory_INCLUDED
|