Android System Programming

Loading the driver

Let's analyze the load_driver function, which is the one that finds and loads the OpenGL ES user space driver:

void *Loader::load_driver(const char* kind,         egl_connection_t* cnx, uint32_t mask) {     class MatchFile {     public:         static String8 find(const char* kind) {     ...     };     String8 absolutePath = MatchFile::find(kind);     if (absolutePath.isEmpty()) {         // this happens often, we don't want to log an error         return 0;     }     const char* const driver_absolute_path = absolutePath.string();     void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);     if (dso == 0) {         const char* err = dlerror();         ALOGE("load_driver(%s): %s", driver_absolute_path, err?        err:"unknown");         return 0;     }  ALOGD("loaded %s", driver_absolute_path); ...