To download this version of NaCl toolchain, please go to NaCl SDK Download and choose to download version 56.
C PPAPI Reference
C++ PPAPI Reference
Please note that the Samsung NaCl SDK toolchain is not the same as the Google one. Some interfaces that are present in one of them may not be available in the other. The complete list of interfaces, along with their availability, can be found on the pages below:
Functions, enums, typedefs and macros are not covered in this comparison.