man Pages(3): Library Routines
    
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 offsetof -- offset of structure member ( Index Term Link )
 
 open a shared object -- dlopen ( Index Term Link )
 
 open a stream -- fopen ( Index Term Link )
 
 open a stream -- freopen ( Index Term Link )
 
 open directory -- opendir ( Index Term Link )
 
 opendir -- open directory ( Index Term Link )
 
 openlog -- control system log ( Index Term Link )
 
 openpl -- graphics interface ( Index Term Link )
 
 openvt -- graphics interface ( Index Term Link )
 
 operations on a synchronization object in libthread_db
  -- td_sync_get_info ( Index Term Link )
  -- td_sync_setstate ( Index Term Link )
  -- td_sync_waiters ( Index Term Link )
 
 output conversion, wsprintf -- convert to wchar_t string ( Index Term Link )
 
 output conversion, formatted
  -- fprintf ( Index Term Link )
  -- printf ( Index Term Link )
  -- sprintf ( Index Term Link )
  -- vfprintf ( Index Term Link )
  -- vprintf ( Index Term Link )
  -- vsprintf ( Index Term Link )
 
 overlap or overwrite windows
  -- overlay ( Index Term Link )
  -- overwrite ( Index Term Link )
 
 overlay -- overlap or overwrite windows ( Index Term Link )
 
 overlay or overwrite any portion of window -- copywin ( Index Term Link )
 
 overview of concepts related to POSIX thread cancellation -- cancellation ( Index Term Link )
 
 overview of the XFN interface -- xfn ( Index Term Link )
 
 an overview of XFN attribute operations -- xfn_attributes ( Index Term Link )
 
 XFN compound syntax: an overview of XFN model for compound name parsing -- xfn_compound_names ( Index Term Link )
 
 overwrite -- overlap or overwrite windows ( Index Term Link )