+#endif /* CONFIG_STACKTRACE */
+}
+
+void assert_hook(void)
+{
+ model_print("Add breakpoint to line %u in file %s.\n", __LINE__, __FILE__);
+}
+
+void model_assert(bool expr, const char *file, int line)
+{
+ if (!expr) {
+ char msg[100];
+ sprintf(msg, "Program has hit assertion in file %s at line %d\n",
+ file, line);
+ model->assert_user_bug(msg);
+ }
+}
+
+#ifndef CONFIG_DEBUG
+
+static int fd_user_out; /**< @brief File descriptor from which to read user program output */
+
+/**
+ * @brief Setup output redirecting
+ *
+ * Redirects user program's stdout to a pipe so that we can dump it
+ * selectively, when displaying bugs, etc.
+ * Also connects a file descriptor 'model_out' directly to stdout, for printing
+ * data when needed.
+ *
+ * The model-checker can selectively choose to print/hide the user program
+ * output.
+ * @see clear_program_output
+ * @see print_program_output
+ *
+ * Note that the user program's pipe has limited memory, so if a program will
+ * output much data, we will need to buffer it in user-space during execution.
+ * This also means that if ModelChecker decides not to print an execution, it
+ * should promptly clear the pipe.
+ *
+ * This function should only be called once.
+ */
+char filename[256];
+
+void redirect_output()
+{
+ /* Save stdout for later use */
+ model_out = dup(STDOUT_FILENO);
+ if (model_out < 0) {
+ perror("dup");
+ exit(EXIT_FAILURE);
+ }
+ snprintf_(filename, sizeof(filename), "C11FuzzerTmp%d", getpid());
+ fd_user_out = open(filename, O_CREAT | O_TRUNC| O_RDWR, S_IRWXU);
+ if (dup2(fd_user_out, STDOUT_FILENO) < 0) {
+ perror("dup2");
+ exit(EXIT_FAILURE);
+ }
+