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1. A pointer to a character string describing the runtime-constraint violation.
2. A null NULL pointer or a pointer to an implementation defined object.
3. If the function calling the handler has a return type declared as errno_t, the return value of the function is passed. Otherwise, a positive value of type errno_t is passed.

The implementation has a default constraint handler that is used if no calls to the set_constraint_handler_s() function have been made or the handler argument to set_constraint_handler_s() is a null NULL pointer. The behavior of the default handler is implementation-defined, and it may cause the program to exit or abort.

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errno_t function(char * dst1, size_t size){
  char src1[100] = "hello";

  if (strcpy_s(dst1, size, src1) != 0) {
    return -1;
  }
  /* ... */
  return 0;
}

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constraint_handler_t handle_errors() {
  /* handle runtime-constraint error */
}

/*...*/

set_constraint_handler(handle_errors);

/*...*/

/* Returns zero on success */
errno_t function(char * dst1, size_t size){
  char src1[100] = "hello";

  if (strcpy_s(dst1, size, src1) != 0) {
    return -1;
  }
  /* ... */
  return 0;
}

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