<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <title>MDP - mdp_dlopen.h: Dynamic Library Loader</title> <meta http-equiv='Content-Type' content='text/html; charset=utf-8'> <link rel='stylesheet' href='mdp.css' type='text/css'> </head> <body> <h1 class='doc_title'>MDP - mdp_dlopen.h: Dynamic Library Loader</h1> <h4 class='doc_set'>Mega Drive Plugins v1.0.0<br>Revision 0</h4> <div class='navbar'> <span class='navitem'><a href="index.html">Index</a></span> <span class='navarrow'>→</span> <span class='navitem'><a href="mdp_dlopen_h.html">mdp_dlopen.h</a></span> </div> <p> MDP plugins are contained within dynamic libraries. To simplify the loading of MDP plugins in emulators, MDP provides a lightweight wrapper file, <span class='filename'>mdp_dlopen.h</span>. This file contains macros that wrap around operating system functionality for loading dynamic libraries. </p> <p> Operating systems currently supported with mdp_dlopen.h: <ul> <li>Microsoft Windows 32-bit/64-bit</li> <li> POSIX-compliant operating systems that support <span class='function'>dlopen()</span>, e.g. Unix, Linux, MacOS X, FreeBSD </li> </ul> </p> <p>Wrapper macros provided by <span class='filename'>mdp_dlopen.h</span>:</p> <table> <tr> <th>Function</th> <th>Description</th> </tr> <tr> <td class='function'> <span class='type'>void*</span> mdp_dlopen(<span class='type'>const char*</span> <span class='variable'>filename</span>); </td> <td> Opens a dynamic library.<br> <span class='variable'>filename</span>: Filename of the dynamic library to open.<br> Returns a pointer to the library handle, or <span class='value'>NULL</span> on error. </td> </tr> <tr> <td class='function'> <span class='type'>void</span> mdp_dlclose(<span class='type'>void*</span> <span class='variable'>handle</span>); </td> <td> Closes a dynamic library.<br> <span class='variable'>handle</span>: Library handle previously obtained with <span class='function'>mdp_dlopen()</span><br> </td> </tr> <tr> <td class='function'> <span class='type'>void*</span> mdp_dlsym(<span class='type'>void*</span> <span class='variable'>handle</span>, <span class='type'>const char*</span> <span class='variable'>symbol</span>); </td> <td> Retrieves the specified symbol from an open library.<br> <span class='variable'>handle</span>: Library handle previously obtained with <span class='function'>mdp_dlopen()</span>.<br> <span class='variable'>symbol</span>: Name of the symbol to retrieve.<br> Returns a pointer to the symbol in the library, or <span class='value'>NULL</span> on error. </td> </tr> <tr> <td class='function'> <span class='type'>const char*</span> mdp_dlerror(<span class='type'>void</span>); </td> <td> Retrieves the last error message from the dynamic library loader.<br> Returns a <span class='type'>const char*</span> string, which must be freed later. </td> </tr> <tr> <td class='function'> <span class='type'>void</span> mdp_dlerror_str_free(<span class='type'>const char*</span> <span class='variable'>errstr</span>); </td> <td> Frees an error string obtained by <span class='function'>mdp_dlerror()</span>.<br> <span class='variable'>errstr</span>: String to free.<br> </td> </tr> </table> <p> Note: <span class='filename'>mdp_dlopen.h</span> is provided as a convenience. Emulators implementing MDP do not need to use this file in order to load plugins. </p> </body> </html>
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