1 file changed, 8 insertions, 3 deletions
diff --git a/source/config.c b/source/config.c
index 49cd398..ca7c688 100644
--- a/source/config.c
+++ b/source/config.c
@@ -85,24 +85,29 @@ static int read_entry(FILE *f, struct strbuf *name, struct strbuf *value)
 	}
 }
 
-void config_file_parse(const char *filename, config_file_value_fn fn)
+int config_file_parse(const char *filename, config_file_value_fn fn)
 {
 	static int nesting;
 	struct strbuf name = STRBUF_INIT;
 	struct strbuf value = STRBUF_INIT;
 	FILE *f;
+	int err = 0;
 
 	// An include line calls back into here, so an include cycle would
 	// recurse until the stack gave out.
 	if (nesting > MAX_INCLUDE_NESTING)
-		return;
+		return 0;
 	if (!(f = fopen(filename, "r")))
-		return;
+		return errno;
 	nesting++;
 	while (read_entry(f, &name, &value))
 		fn(name.buf, value.buf);
+	// A directory opens like a file and fails only once it is read.
+	if (ferror(f))
+		err = errno;
 	nesting--;
 	fclose(f);
 	strbuf_release(&name);
 	strbuf_release(&value);
+	return err;
 }