man pages section 3: Basic Library Functions
    
O
 
 obtain information on scheduling decisions — getcpuid ( Index Term Link )
 
 obtain information on scheduling decisions — gethomelgroup ( Index Term Link )
 
 offsetof — offset of structure member ( Index Term Link )
 
 open a shared object — dlopen ( Index Term Link )
 
 open directory — fdopendir ( Index Term Link )
 
 open directory — opendir ( Index Term Link )
 
 open a file — attropen ( Index Term Link )
 
 open a stream — fopen ( Index Term Link )
 
 open a stream — freopen ( Index Term Link )
 
 opendir — open directory ( Index Term Link )
 
 openlog — control system log ( 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 )