dlsym 45 sample/dso/ftdmload.c real_dlopen = dlsym(RTLD_NEXT, "dlopen"); dlsym 66 sample/dso/ftdmload.c real_dlclose = dlsym(RTLD_NEXT, "dlclose"); dlsym 107 src/ftdm_dso.c void *func = dlsym(lib, sym);