1 files changed, 15 insertions, 0 deletions
diff --git a/tests/io_mock.h b/tests/io_mock.h
index f8f75adc..a36602a4 100644
--- a/tests/io_mock.h
+++ b/tests/io_mock.h
@@ -60,6 +60,15 @@ struct pci_dev {
 /* Always return success for tests. */
 #define S_ISREG(x) 0
 
+/* Maximum number of open calls to mock. This number is arbitrary. */
+#define MAX_MOCK_OPEN 4
+
+struct io_mock_fallback_open_state {
+	unsigned int noc;
+	const char *paths[MAX_MOCK_OPEN];
+	int flags[MAX_MOCK_OPEN];
+};
+
 struct io_mock {
 	void *state;
 
@@ -105,6 +114,12 @@ struct io_mock {
 	size_t (*fread)(void *state, void *buf, size_t size, size_t len, FILE *fp);
 	int (*fprintf)(void *state, FILE *fp, const char *fmt, va_list args);
 	int (*fclose)(void *state, FILE *fp);
+
+	/*
+	 * An alternative to custom open mock. A test can either register its
+	 * own mock open function or fallback_open_state.
+	 */
+	struct io_mock_fallback_open_state *fallback_open_state;
 };
 
 void io_mock_register(const struct io_mock *io);