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https://github.com/ZDoom/ZMusic.git
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b9d22fb358
If the same global variable is used by executable that linked to ZMusic dynamic library, both definitions may clash For example, Linux builds of GZDoom and Raze could crash on exit because of double free, std::string destructor was called twice on the same module_progdir variable
113 lines
3 KiB
C++
113 lines
3 KiB
C++
/*
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** i_module.cpp
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**
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**---------------------------------------------------------------------------
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** Copyright 2016 Braden Obrzut
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include "i_module.h"
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#else
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#include <dlfcn.h>
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#endif
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#ifndef _WIN32
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#define LoadLibraryA(x) dlopen((x), RTLD_LAZY)
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#define GetProcAddress(a,b) dlsym((a),(b))
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#define FreeLibrary(x) dlclose((x))
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using HMODULE = void*;
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#endif
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bool FModule::Load(std::initializer_list<const char*> libnames)
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{
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for(auto lib : libnames)
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{
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if(!Open(lib))
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continue;
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StaticProc *proc;
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for(proc = reqSymbols;proc;proc = proc->Next)
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{
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if(!(proc->Call = GetSym(proc->Name)) && !proc->Optional)
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{
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Unload();
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break;
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}
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}
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if(IsLoaded())
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return true;
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}
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return false;
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}
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void FModule::Unload()
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{
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if(handle)
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{
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FreeLibrary((HMODULE)handle);
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handle = nullptr;
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}
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}
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bool FModule::Open(const char* lib)
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{
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#ifdef _WIN32
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if((handle = GetModuleHandleA(lib)) != nullptr)
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return true;
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#else
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// Loading an empty string in Linux doesn't do what we expect it to.
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if(*lib == '\0')
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return false;
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#endif
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handle = LoadLibraryA(lib);
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return handle != nullptr;
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}
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void *FModule::GetSym(const char* name)
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{
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return (void *)GetProcAddress((HMODULE)handle, name);
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}
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static std::string module_progdir("."); // current program directory used to look up dynamic libraries. Default to something harmless in case the user didn't set it.
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void FModule_SetProgDir(const char* progdir)
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{
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module_progdir = progdir;
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}
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const std::string& FModule_GetProgDir()
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{
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return module_progdir;
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}
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