/usr/include/ace/DLL.h is in libace-dev 6.0.1-3.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | // -*- C++ -*-
//=============================================================================
/**
* @file DLL.h
*
* $Id: DLL.h 91064 2010-07-12 10:11:24Z johnnyw $
*
* @author Kirthika Parameswaran <kirthika@cs.wustl.edu>
*/
//=============================================================================
#ifndef ACE_DLL_H
#define ACE_DLL_H
#include /**/ "ace/pre.h"
#include /**/ "ace/ACE_export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Global_Macros.h"
#include "ace/os_include/os_dlfcn.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ACE_DLL_Handle;
/**
* @class ACE_DLL
*
* @brief Provides an abstract interface for handling various DLL
* operations.
*
* This class is a wrapper over the various methods for utilizing
* a dynamically linked library (DLL), which is called a shared
* library on some platforms. Operations @c open(), @c close(), and
* @c symbol() have been implemented to help opening/closing and
* extracting symbol information from a DLL, respectively.
*/
class ACE_Export ACE_DLL
{
public:
// = Initialization and termination methods.
/**
* Default constructor. By default, the close() operation on the
* object will be invoked before it is destroyed.
* @param close_handle_on_destruction Indicates whether or not the
* close() method will be called to close an open DLL when this
* object is destroyed. By default, close() will be called.
* Set this parameter to 0 for situations where the DLL's lifetime
* is controlled in a scope other than that of this ACE_DLL object.
* For example, termination by ACE_DLL_Manager via ACE::fini().
*/
explicit ACE_DLL (bool close_handle_on_destruction = true);
/// Allow assignment
ACE_DLL& operator= (const ACE_DLL &rhs);
/**
* This constructor performs the actions of open() during construction.
* @param dll_name The name or path of the DLL to load.
* @param open_mode Flags to alter the actions taken when loading the DLL.
* The possible values are:
* @li @c RTLD_LAZY (this the default): loads identifier symbols but
* not the symbols for functions, which are loaded dynamically
* on-demand.
* @li @c RTLD_NOW: performs all necessary relocations when
* @a dll_name is first loaded
* @li RTLD_GLOBAL: makes symbols available for relocation
* processing of any other DLLs.
* @param close_handle_on_destruction Indicates whether or not the
* close() method will be called to close an open DLL when this
* object is destroyed. By default, close() will be called.
* Set this parameter to 0 for situations where the DLL's lifetime
* is controlled in a scope other than that of this ACE_DLL object.
* For example, termination by ACE_DLL_Manager via ACE::fini().
*/
explicit ACE_DLL (const ACE_TCHAR *dll_name,
int open_mode = ACE_DEFAULT_SHLIB_MODE,
bool close_handle_on_destruction = true);
/// Copy constructor.
ACE_DLL (const ACE_DLL &);
/**
* This method opens and dynamically links a specified DLL.
* @param dll_name The filename or path of the DLL to load.
* If a filename is given to @c open(), the @c ACE::ldfind() is used
* to locate DLLs via the following algorithms: (1) DLL filename
* expansion: @c ACE::ldfind() determines the name of the DLL by
* adding the appropriate prefix and suffix, e.g., it adds the @c lib
* prefix and @c .so suffix for Solaris and the @c .dll suffix for
* Windows and (2) DLL search path: @c ACE::ldfind() will also search
* for the designated DLL using the platform's DLL search path
* environment variable, e.g., it searches for DLLs using @c
* LD_LIBRARY_PATH on many UNIX systems and @c PATH on Windows.
* @param open_mode Flags to alter the actions taken when loading the DLL.
* The possible values are:
* @li @c RTLD_LAZY (this the default): loads identifier symbols but
* not the symbols for functions, which are loaded dynamically
* on-demand.
* @li @c RTLD_NOW: performs all necessary relocations when
* @a dll_name is first loaded
* @li RTLD_GLOBAL: makes symbols available for relocation
* processing of any other DLLs.
* @param close_handle_on_destruction Indicates whether or not the
* close() method will be called to close an open DLL when this
* object is destroyed. By default, close() will be called.
* Set this parameter to 0 for situations where the DLL's lifetime
* is controlled in a scope other than that of this ACE_DLL object.
* For example, termination by ACE_DLL_Manager via ACE::fini().
* @retval -1 On failure
* @retval 0 On success.
*/
int open (const ACE_TCHAR *dll_name,
int open_mode = ACE_DEFAULT_SHLIB_MODE,
bool close_handle_on_destruction = true);
/// Call to close the DLL object.
int close (void);
/**
* Called when the DLL object is destroyed -- invokes close() if the
* @a close_handle_on_destruction flag was set to non-zero in the
* constructor or open() method.
*/
~ACE_DLL (void);
/**
* Look up a named symbol in the DLL. DLL must be successfully opened
* before calling symbol().
* @param symbol_name The symbol name to look up.
* @param ignore_errors If set to 1, allows you to probe a dll without
* generating error messages in the log. Handy for determining
* the capabilities of a library.
* @return Returns the value of @a symbol_name if it is a valid symbol
* in the DLL. Otherwise, returns 0.
*/
void *symbol (const ACE_TCHAR *symbol_name, int ignore_errors = 0);
/// Returns a pointer to a string explaining that an error occured. You
/// will need to consult the error log for the actual error string
/// returned by the OS.
ACE_TCHAR *error (void) const;
/**
* Return the handle to the caller. If @a become_owner is non-0 then
* caller assumes ownership of the handle and the ACE_DLL object
* won't call close() when it goes out of scope, even if
* @c close_handle_on_destruction is set.
*/
ACE_SHLIB_HANDLE get_handle (int become_owner = 0) const;
/// Set the handle for the DLL object. By default, the close()
/// operation on / the object will be invoked before it is destroyed.
int set_handle (ACE_SHLIB_HANDLE handle,
bool close_handle_on_destruction = true);
private:
int open_i (const ACE_TCHAR *dll_name,
int open_mode = ACE_DEFAULT_SHLIB_MODE,
bool close_handle_on_destruction = true,
ACE_SHLIB_HANDLE handle = 0);
//private:
public:
/// Open mode.
int open_mode_;
/// Keep track of the name of the loaded dll, so it can be used
/// to remove framework components, singletons that live in the dll,
/// prior to unloading the dll in the close() method.
ACE_TCHAR *dll_name_;
/// This flag keeps track of whether we should close the handle
/// automatically when the object is destroyed.
bool close_handle_on_destruction_;
ACE_DLL_Handle *dll_handle_;
/// Flag to record if the last operation had an error.
bool error_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_DLL_H */
|