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constraint_handler_t handle_errors(void) {
  constraint_handler_t data;
  /* Define what to do when error occurs */
  return data;
}

/* ... */

set_constraint_handler(handle_errors);

/* ... */

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

  strcpy_s(dst1, sizeof(dst1)dst_size, src1);
  /* 
   * At this point strcpy_s may have yielded an
   * error, and handle_errors() might have returned.
   */

  /* ... */
  return 0;
}

/*
 * The abort_handler_s() function writes 
 * a message on the standard error stream and
 * then calls the abort() function.
 */
set_constraint_handler(abort_handler_s);

/* ... */

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

  strcpy_s(dst1, sizeof(dst1)dst_size, src1);
  /*
   * Because abort_handler_s() never returns,
   * we get here only if strcpy_s() succeeds.
   */

  /* ... */
  return 0;
}