src/bindings: add features list

Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@canonical.com>

Author: mihalicyn

src/bindings.c

@@ -45,6 +45,10 @@
 #define BASEDIR "/lxcfs/controllers"
 #define ROOTDIR "/lxcfs/root"
 
+feature_t per_instance_features[63] = {
+	{ }
+};
+
 static bool can_use_pidfd;
 static bool can_use_swap;
 static bool can_use_sys_cpu;

src/bindings.h

@@ -99,16 +99,30 @@ extern int rwlock_rdlock_interruptible(pthread_rwlock_t *l);
 extern int rwlock_wrlock_interruptible(pthread_rwlock_t *l);
 
 struct file_info {
-	char *controller;
-	char *cgroup;
-	char *file;
+	union {
+		struct {
+			char *controller;
+			char *cgroup;
+			char *file;
+		};
+		struct {
+			void *private_data;
+		};
+	};
+
 	int type;
 	char *buf; /* unused */
 	int buflen;
-	int size; /*actual data size */
+	int size; /* actual data size */
 	int cached;
 };
 
+typedef struct feature {
+	char *name;
+} feature_t;
+
+extern feature_t per_instance_features[];
+
 enum lxcfs_feature_op {
 	LXCFS_FEATURE_CHECK,
 	LXCFS_FEATURE_SET,