Add support for UST application registration

[lttng-tools.git] / ltt-sessiond / traceable-app.h

diff --git a/ltt-sessiond/traceable-app.h b/ltt-sessiond/traceable-app.h
index 364e70598288579ec0edf1a98bb4db4ccbeddb15..4d5e56a66d9763153eb1afb1440ce513abfe34d8 100644 (file)
--- a/ltt-sessiond/traceable-app.h
+++ b/ltt-sessiond/traceable-app.h
@@ -19,25 +19,67 @@
 #ifndef _TRACEABLE_APP_H 
 #define _TRACEABLE_APP_H
 
-/* Traceable application list */
+#include <stdint.h>
+#include <urcu/list.h>
+
+/*
+ * Application registration data structure.
+ */
+struct ust_register_msg {
+       uint32_t major;
+       uint32_t minor;
+       pid_t pid;
+       pid_t ppid;
+       uid_t uid;
+       gid_t gid;
+       char name[16];
+};
+
+/*
+ * Traceable application list.
+ */
 struct ltt_traceable_app_list {
+       /*
+        * This lock protects any read/write access to the list and count (which is
+        * basically the list size). All public functions in traceable-app.c
+        * acquire this lock and release it before returning. If none of those
+        * functions are used, the lock MUST be acquired in order to iterate or/and
+        * do any actions on that list.
+        */
+       pthread_mutex_t lock;
+
+       /*
+        * Number of element in the list. The session list lock MUST be acquired if
+        * this counter is used when iterating over the session list.
+        */
+       unsigned int count;
+
+       /* Linked list head */
        struct cds_list_head head;
 };
 
-/* Registered traceable applications. Libust registers
- * to the session daemon and a linked list is kept
- * of all running traceable app.
+/* Registered traceable applications. Libust registers to the session daemon
+ * and a linked list is kept of all running traceable app.
  */
 struct ltt_traceable_app {
-       struct cds_list_head list;
+       int sock;            /* Communication socket with the application */
        pid_t pid;
-       uid_t uid;              /* User ID that owns the apps */
+       pid_t ppid;
+       uid_t uid;           /* User ID that owns the apps */
+       gid_t gid;           /* Group ID that owns the apps */
+       uint32_t v_major;    /* Verion major number */
+       uint32_t v_minor;    /* Verion minor number */
+       char name[17];       /* Process name (short) */
+       struct cds_list_head list;
 };
 
-struct ltt_traceable_app *find_app_by_pid(pid_t pid);
-int register_traceable_app(pid_t pid, uid_t uid);
-void unregister_traceable_app(pid_t pid);
-void get_app_list_pids(pid_t *pids);
+int register_traceable_app(struct ust_register_msg *msg, int sock);
+void unregister_traceable_app(int sock);
 unsigned int get_app_count(void);
 
+void lock_apps_list(void);
+void unlock_apps_list(void);
+void clean_traceable_apps_list(void);
+struct ltt_traceable_app_list *get_traceable_apps_list(void);
+
 #endif /* _TRACEABLE_APP_H */