diff --git a/.gitignore b/.gitignore
index 0ef0814..eead08e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -65,5 +65,7 @@ compile_commands.json
 CTestTestfile.cmake
 _deps
 CMakeUserPresets.json
-
 build
+
+# clangd
+.cache/
diff --git a/include/cosms-core/file.h b/include/cosms-core/file.h
index 605a29d..4a0c4ae 100644
--- a/include/cosms-core/file.h
+++ b/include/cosms-core/file.h
@@ -9,7 +9,12 @@
 #ifndef COSMS_CORE_FILE
 #define COSMS_CORE_FILE
 
-void cosms_core_file_read(char *path);
-void cosms_core_file_write(char *path);
+typedef enum {
+    COSMS_FILE_OK = 0,
+    COSMS_FILE_NOT_FOUND = -1,
+} CosmsFileError;
+
+CosmsFileError cosms_core_file_read(char *path);
+CosmsFileError cosms_core_file_write(char *path);
 
 #endif
diff --git a/src/file.c b/src/file.c
index 23b3617..d7660d4 100644
--- a/src/file.c
+++ b/src/file.c
@@ -10,10 +10,12 @@
 
 #include <stdio.h>
 
-void cosms_core_file_read(char *path) {
+CosmsFileError cosms_core_file_read(char *path) {
 	printf("Hello, World!");
+    return COSMS_FILE_OK;
 }
 
-void cosms_core_file_write(char *path) {
+CosmsFileError cosms_core_file_write(char *path) {
 	printf("Hello, World");
+    return COSMS_FILE_OK;
 }