dllmain.h

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#ifndef DLLMAIN_H
#define DLLMAIN_H
 
#ifndef _WIN32
    #include <syslog.h>
#else /* _WIN32 */
    #include <windows.h>
#endif /* _WIN32 */

#ifndef _WIN32
    #define DLLMAIN_INFO_MSG(msg) syslog(LOG_INFO, (msg))
#else /* _WIN32 */
    #define DLLMAIN_INFO_MSG(msg) OutputDebugStringA(msg)
#endif /* _WIN32 */

static void onLoad(void);

static void onUnload(void);
 
#ifndef _WIN32

__attribute__((constructor)) static void dllmain_on_load__(void)
{
    onLoad();
}

__attribute__((destructor)) static void dllmain_on_unload__(void)
{
    onUnload();
}
 
#else /* _WIN32 */

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
    (void)hinstDLL;
    (void)lpvReserved;
    switch (fdwReason)
    {
    case DLL_PROCESS_ATTACH:
        onLoad();
        break;
    case DLL_PROCESS_DETACH:
        onUnload();
        break;
    default:
        break;
    }
    return TRUE;
}
 
#endif /* _WIN32 */
 
#endif /* DLLMAIN_H */