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xash3d-fwgs/engine/platform/posix/lib_posix.c
Alibek Omarov 5e1f189db3 engine: platform: posix: use RTLD_NOW instead of lazy.
It actually was a misconception coming from old engine fork
We want to track unresolved symbols before library could be loaded

Also, disable "symbol not found" spam in FunctionFromName. Due to how
savefile mangling convert works and compatibility with GoldSrc saves,
this function is used to bruteforce possible symbol names.
2022-07-13 19:26:38 +03:00

236 lines
5.5 KiB
C

/*
lib_posix.c - dynamic library code for POSIX systems
Copyright (C) 2018 Flying With Gauss
This program is free software: you can redistribute it and/sor modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#define _GNU_SOURCE
#include "platform/platform.h"
#if XASH_LIB == LIB_POSIX
#include <dlfcn.h>
#include "common.h"
#include "library.h"
#include "filesystem.h"
#include "server.h"
#include "platform/android/lib_android.h"
#include "platform/emscripten/lib_em.h"
#include "platform/apple/lib_ios.h"
#ifdef XASH_DLL_LOADER // wine-based dll loader
void * Loader_LoadLibrary (const char *name);
void * Loader_GetProcAddress (void *hndl, const char *name);
void Loader_FreeLibrary(void *hndl);
void *Loader_GetDllHandle( void *hndl );
const char * Loader_GetFuncName( void *hndl, void *func);
const char * Loader_GetFuncName_int( void *wm , void *func);
#endif
#ifdef XASH_NO_LIBDL
#ifndef XASH_DLL_LOADER
#error Enable at least one dll backend!!!
#endif // XASH_DLL_LOADER
void *dlsym(void *handle, const char *symbol )
{
Con_DPrintf( "dlsym( %p, \"%s\" ): stub\n", handle, symbol );
return NULL;
}
void *dlopen(const char *name, int flag )
{
Con_DPrintf( "dlopen( \"%s\", %d ): stub\n", name, flag );
return NULL;
}
int dlclose(void *handle)
{
Con_DPrintf( "dlsym( %p ): stub\n", handle );
return 0;
}
char *dlerror( void )
{
return "Loading ELF libraries not supported in this build!\n";
}
int dladdr( const void *addr, Dl_info *info )
{
return 0;
}
#endif // XASH_NO_LIBDL
qboolean COM_CheckLibraryDirectDependency( const char *name, const char *depname, qboolean directpath )
{
// TODO: implement
return true;
}
void *COM_LoadLibrary( const char *dllname, int build_ordinals_table, qboolean directpath )
{
dll_user_t *hInst = NULL;
void *pHandle = NULL;
COM_ResetLibraryError();
// platforms where gameinfo mechanism is impossible
#ifdef Platform_POSIX_LoadLibrary
return Platform_POSIX_LoadLibrary( dllname );
#endif
// platforms where gameinfo mechanism is working goes here
// and use FS_FindLibrary
hInst = FS_FindLibrary( dllname, directpath );
if( !hInst )
{
// HACKHACK: direct load dll
#ifdef XASH_DLL_LOADER
if( host.enabledll && ( pHandle = Loader_LoadLibrary(dllname)) )
{
return pHandle;
}
#endif
// try to find by linker(LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, LD_32_LIBRARY_PATH and so on...)
if( !pHandle )
{
pHandle = dlopen( dllname, RTLD_NOW );
if( pHandle )
return pHandle;
COM_PushLibraryError( va( "Failed to find library %s", dllname ));
COM_PushLibraryError( dlerror() );
return NULL;
}
}
if( hInst->custom_loader )
{
COM_PushLibraryError( va( "Custom library loader is not available. Extract library %s and fix gameinfo.txt!", hInst->fullPath ));
Mem_Free( hInst );
return NULL;
}
#ifdef XASH_DLL_LOADER
if( host.enabledll && ( !Q_stricmp( COM_FileExtension( hInst->shortPath ), "dll" ) ) )
{
if( hInst->encrypted )
{
COM_PushLibraryError( va( "Library %s is encrypted. Cannot load", hInst->shortPath ) );
Mem_Free( hInst );
return NULL;
}
if( !( hInst->hInstance = Loader_LoadLibrary( hInst->fullPath ) ) )
{
COM_PushLibraryError( va( "Failed to load DLL with DLL loader: %s", hInst->shortPath ) );
Mem_Free( hInst );
return NULL;
}
}
else
#endif
{
if( !( hInst->hInstance = dlopen( hInst->fullPath, RTLD_NOW ) ) )
{
COM_PushLibraryError( dlerror() );
Mem_Free( hInst );
return NULL;
}
}
pHandle = hInst->hInstance;
Mem_Free( hInst );
return pHandle;
}
void COM_FreeLibrary( void *hInstance )
{
#ifdef XASH_DLL_LOADER
void *wm;
if( host.enabledll && (wm = Loader_GetDllHandle( hInstance )) )
return Loader_FreeLibrary( hInstance );
else
#endif
{
#ifdef Platform_POSIX_FreeLibrary
Platform_POSIX_FreeLibrary( hInstance );
#else
dlclose( hInstance );
#endif
}
}
void *COM_GetProcAddress( void *hInstance, const char *name )
{
#ifdef XASH_DLL_LOADER
void *wm;
if( host.enabledll && (wm = Loader_GetDllHandle( hInstance )) )
return Loader_GetProcAddress(hInstance, name);
else
#endif
#if Platform_POSIX_GetProcAddress
return Platform_POSIX_GetProcAddress( hInstance, name );
#else
return dlsym( hInstance, name );
#endif
}
void *COM_FunctionFromName( void *hInstance, const char *pName )
{
return COM_GetProcAddress( hInstance, pName );
}
#ifdef XASH_DYNAMIC_DLADDR
static int d_dladdr( void *sym, Dl_info *info )
{
static int (*dladdr_real) ( void *sym, Dl_info *info );
if( !dladdr_real )
dladdr_real = dlsym( (void*)(size_t)(-1), "dladdr" );
memset( info, 0, sizeof( *info ) );
if( !dladdr_real )
return -1;
return dladdr_real( sym, info );
}
#define dladdr d_dladdr
#endif
const char *COM_NameForFunction( void *hInstance, void *function )
{
#ifdef XASH_DLL_LOADER
void *wm;
if( host.enabledll && (wm = Loader_GetDllHandle( hInstance )) )
#error ConvertMangledName
return Loader_GetFuncName_int(wm, function);
else
#endif
// NOTE: dladdr() is a glibc extension
{
Dl_info info = {0};
dladdr( (void*)function, &info );
if( info.dli_sname )
return COM_GetPlatformNeutralName( info.dli_sname );
}
#ifdef XASH_ALLOW_SAVERESTORE_OFFSETS
return COM_OffsetNameForFunction( function );
#else
return NULL;
#endif
}
#endif // _WIN32