20 #ifndef __JackSystemDeps_POSIX__    21 #define __JackSystemDeps_POSIX__    24 #include <sys/types.h>    29 #define UINT32_MAX 4294967295U    32 #define DRIVER_HANDLE void*    33 #define LoadDriverModule(name) dlopen((name), RTLD_NOW | RTLD_GLOBAL)    34 #define UnloadDriverModule(handle) dlclose((handle))    35 #define GetDriverProc(handle, name) dlsym((handle), (name))    37 #define JACK_HANDLE void*    38 #define LoadJackModule(name) dlopen((name), RTLD_NOW | RTLD_LOCAL);    39 #define UnloadJackModule(handle) dlclose((handle));    40 #define GetJackProc(handle, name) dlsym((handle), (name));    42 #define JACK_DEBUG (getenv("JACK_CLIENT_DEBUG") && strcmp(getenv("JACK_CLIENT_DEBUG"), "on") == 0)