Ruby 2.7.0p0(2019-12-25revision647ee6f091eafcce70ffb75ddf7e121e192ab217)

### - u -

- ualarm() : rb_mjit_min_header-2.7.0.h
- umask() : rb_mjit_min_header-2.7.0.h
- ungetc() : rb_mjit_min_header-2.7.0.h
- unlink() : rb_mjit_min_header-2.7.0.h
- unlinkat() : rb_mjit_min_header-2.7.0.h
- unlockpt() : rb_mjit_min_header-2.7.0.h
- unsetenv() : rb_mjit_min_header-2.7.0.h
- usleep() : rb_mjit_min_header-2.7.0.h
- utimensat() : rb_mjit_min_header-2.7.0.h
- utoa() : rb_mjit_min_header-2.7.0.h