If a normal return from main() terminates the application, the user return code value is 0. When a C or C++ routine terminates an enclave with a language construct such as exit(n) or return(n), the value of n is used.

If the enclave terminates due to an unhandled condition of severity 2 or greater, the user return code value is 0. For information on unhandled conditions, see Termination behavior for unhandled conditions. For more information about C or C++ language constructs, see z/OS XL C/C++ Programming Guide.