The OM_return_code data type is used for a value that is returned from all OM functions, indicating either that the function succeeded or why it failed. Its C declaration is as follows:
typedef OM_uint OM_return_code;
A data value of this data type is the integer in the range 0 to 2-to-the-16th-power that indicates an outcome of an interface function. It is chosen from the set specified in XOM Return Codes .
Integers in the narrower range 0 to 2-to-the-15th-power are used to indicate the return codes they define.