man Pages(3): Library Routines
    
U
 
 uaddr2taddr -- generic transport name-to-address translation ( Index Term Link )
 
 ualarm -- schedule signal after interval in microseconds ( Index Term Link )
 
 ulltostr -- string conversion routines ( Index Term Link )
 
 unctrl -- convert character to printable form ( Index Term Link )
 
 unget_wch -- push character back onto the input queue ( Index Term Link )
 
 ungetc -- push byte back into input stream ( Index Term Link )
 
 ungetch -- push character back onto the input queue ( Index Term Link )
 
 ungetwc -- push wide-character code back into input stream ( Index Term Link )
 
 ungetwch -- get (or push back) wchar_t characters from curses terminal keyboard ( Index Term Link )
 
 unlock a pseudo-terminal master/slave pair -- unlockpt ( Index Term Link )
 
 unlock a read-write lock object -- pthread_rwlock_unlock ( Index Term Link )
 
 unlock address space, -- munlockall ( Index Term Link )
 
 unlock memory pages, -- munlock ( Index Term Link )
 
 unlockpt -- unlock a pseudo-terminal master/slave pair ( Index Term Link )
 
 untouchwin -- control window refresh ( Index Term Link )
 
 updwtmp -- access utmpx file entry ( Index Term Link )
 
 updwtmpx -- access utmpx file entry ( Index Term Link )
 
 use complex characters (and renditions) to draw borders
  -- border_set ( Index Term Link )
  -- box_set ( Index Term Link )
  -- wborder_set ( Index Term Link )
 
 use complex characters (and renditions) to draw lines
  -- hline_set ( Index Term Link )
  -- mvhline_set ( Index Term Link )
  -- mvvline_set ( Index Term Link )
  -- mvwhline_set ( Index Term Link )
  -- mvwvline_set ( Index Term Link )
  -- vline_set ( Index Term Link )
  -- whline_set ( Index Term Link )
  -- wvline_set ( Index Term Link )
 
 use_env -- set values of lines and columns ( Index Term Link )
 
 use single-byte characters (and renditions) to draw lines
  -- hline ( Index Term Link )
  -- mvhline ( Index Term Link )
  -- mvvline ( Index Term Link )
  -- mvwhline ( Index Term Link )
  -- mvwvline ( Index Term Link )
  -- vline ( Index Term Link )
  -- whline ( Index Term Link )
  -- wvline ( Index Term Link )
 
 user context
  -- makecontext ( Index Term Link )
  -- swapcontext ( Index Term Link )
 
 user IDs, get character-string representation -- cuserid ( Index Term Link )
 
 users, return information from remote machines -- rusers, rnusers ( Index Term Link )
 
 usleep -- suspend execution for interval in microseconds ( Index Term Link )
 
 utmp file
  access entry -- getutent ( Index Term Link )
  find the slot of current user -- ttyslot ( Index Term Link )
 
 utmpname -- access utmp file entry ( Index Term Link )
 
 utmpx file, access entry -- getutxent ( Index Term Link )
 
 utmpxname -- access utmpx file entry ( Index Term Link )