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dynapi: Minor cleanups to library loading code.

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This commit is contained in:
Ryan C. Gordon
2026-03-18 13:12:56 -04:00
parent 6b060435e3
commit b0cf826227
1 changed files with 34 additions and 27 deletions
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61
src/dynapi/SDL_dynapi.c
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@@ -448,27 +448,28 @@ Sint32 SDL_DYNAPI_entry(Uint32 apiver, void *table, Uint32 tablesize)
}
#endif
// The handle to the other SDL library, loaded with SDL_DYNAMIC_API_ENVVAR
#if defined(WIN32) || defined(_WIN32) || defined(SDL_PLATFORM_CYGWIN)
static HMODULE lib = NULL;
#elif defined(SDL_PLATFORM_UNIX) || defined(SDL_PLATFORM_APPLE) || defined(SDL_PLATFORM_HAIKU)
static void *lib = NULL;
#else
#error Please define your platform.
#endif
// Obviously we can't use SDL_LoadObject() to load SDL. :)
// Also obviously, we never close the loaded library.
// Also obviously, we never close the loaded library, once we accept it.
#if defined(WIN32) || defined(_WIN32) || defined(SDL_PLATFORM_CYGWIN)
static HMODULE sdlapi_lib = NULL; // The handle to the other SDL library, loaded with SDL_DYNAMIC_API_ENVVAR
static SDL_INLINE void unload_sdlapi_library(void)
{
if (sdlapi_lib) {
FreeLibrary(sdlapi_lib);
sdlapi_lib = NULL;
}
}
static SDL_INLINE void *get_sdlapi_entry(const char *fname, const char *sym)
{
lib = LoadLibraryA(fname);
sdlapi_lib = LoadLibraryA(fname);
void *result = NULL;
if (lib) {
result = (void *) GetProcAddress(lib, sym);
if (sdlapi_lib) {
result = (void *) GetProcAddress(sdlapi_lib, sym);
if (!result) {
FreeLibrary(lib);
lib = NULL;
unload_sdlapi_library();
}
}
return result;
@@ -476,19 +477,31 @@ static SDL_INLINE void *get_sdlapi_entry(const char *fname, const char *sym)
#elif defined(SDL_PLATFORM_UNIX) || defined(SDL_PLATFORM_APPLE) || defined(SDL_PLATFORM_HAIKU)
#include <dlfcn.h>
static void *sdlapi_lib = NULL; // The handle to the other SDL library, loaded with SDL_DYNAMIC_API_ENVVAR
static SDL_INLINE void unload_sdlapi_library(void)
{
if (sdlapi_lib) {
dlclose(sdlapi_lib);
sdlapi_lib = NULL;
}
}
static SDL_INLINE void *get_sdlapi_entry(const char *fname, const char *sym)
{
lib = dlopen(fname, RTLD_NOW | RTLD_LOCAL);
sdlapi_lib = dlopen(fname, RTLD_NOW | RTLD_LOCAL);
void *result = NULL;
if (lib) {
result = dlsym(lib, sym);
if (sdlapi_lib) {
result = dlsym(sdlapi_lib, sym);
if (!result) {
dlclose(lib);
lib = NULL;
unload_sdlapi_library();
}
}
return result;
}
#else
#error Please define your platform.
#endif
static void dynapi_warn(const char *msg)
@@ -557,14 +570,8 @@ static void SDL_InitDynamicAPILocked(void)
if (entry(SDL_DYNAPI_VERSION, &jump_table, sizeof(jump_table)) < 0) {
dynapi_warn("Couldn't override SDL library. Using a newer SDL build might help. Please fix or remove the " SDL_DYNAMIC_API_ENVVAR " environment variable. Using the default SDL.");
// unload the other SDL library
#if defined(WIN32) || defined(_WIN32) || defined(SDL_PLATFORM_CYGWIN)
FreeLibrary(lib);
lib = NULL;
#elif defined(SDL_PLATFORM_UNIX) || defined(SDL_PLATFORM_APPLE) || defined(SDL_PLATFORM_HAIKU)
dlclose(lib);
lib = NULL;
#endif
// unload the failed SDL library
unload_sdlapi_library();
// Just fill in the function pointers from this library, later.
} else {