| basename() | POSIX 1003.1 | No | Yes | Yes | Yes | 
               
                  | bcmp() | Standard Unix; removed from POSIX.1-2008 | No | Yes | Yes | Yes | 
               
                  | bcopy() | Standard Unix; removed from POSIX.1-2008 | No | Yes | Yes | Yes | 
               
                  | bind() | POSIX 1003.1 | No | No | Yes | Yes | 
               
                  | bindresvport() | Unix | No | No | No | No | 
               
                  | bsearch() | ANSI
                     POSIX 1003.1 | No | Yes | Yes | Yes | 
               
                  | bt_get_backtrace() | QNX Neutrino | No | No | Yes | Yes | 
               
                  | bt_init_accessor() | QNX Neutrino | No | No | Yes | Yes | 
               
                  | bt_load_memmap() | QNX Neutrino | No | No | No | Yes | 
               
                  | bt_release_accessor() | QNX Neutrino | No | Yes | Yes | Yes | 
               
                  | bt_set_flags() | QNX Neutrino | No | Yes | Yes | Yes | 
               
                  | bt_sprn_memmap() | QNX Neutrino | No | No | Yes | Yes | 
               
                  | bt_sprnf_addrs() | QNX Neutrino | No | No | No | Yes | 
               
                  | bt_translate_addrs() | QNX Neutrino | No | No | Yes | Yes | 
               
                  | bt_unload_memmap() | QNX Neutrino | No | No | No | Yes | 
               
                  | btowc() | ANSI
                     POSIX 1003.1 | No | No | Yes | Yes | 
               
                  | bzero() | Standard Unix; removed from POSIX.1-2008 | No | Yes | Yes | Yes |