Implement PID tracking

[lttng-modules.git] / lttng-events.h

diff --git a/lttng-events.h b/lttng-events.h
index 118ea3b0db52d82e6072e17aa901c1850e22e43c..7d3314590384906fbd95b2406f593c59d1806cd0 100644 (file)
--- a/lttng-events.h
+++ b/lttng-events.h
@@ -324,6 +324,18 @@ struct lttng_metadata_stream {
        struct mutex lock;
 };
 
+
+/*
+ * struct lttng_pid_tracker declared in header due to deferencing of *v
+ * in RCU_INITIALIZER(v).
+ */
+#define LTTNG_PID_HASH_BITS    6
+#define LTTNG_PID_TABLE_SIZE   (1 << LTTNG_PID_HASH_BITS)
+
+struct lttng_pid_tracker {
+       struct hlist_head pid_hash[LTTNG_PID_TABLE_SIZE];
+};
+
 struct lttng_session {
        int active;                     /* Is trace session active ? */
        int been_active;                /* Has trace session been active ? */
@@ -334,6 +346,7 @@ struct lttng_session {
        unsigned int free_chan_id;      /* Next chan ID to allocate */
        uuid_le uuid;                   /* Trace session unique ID */
        struct lttng_metadata_cache *metadata_cache;
+       struct lttng_pid_tracker *pid_tracker;
        unsigned int metadata_dumped:1;
 };
 
@@ -399,6 +412,15 @@ void lttng_probes_exit(void);
 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
                struct channel *chan);
 
+struct lttng_pid_tracker *lttng_pid_tracker_create(void);
+void lttng_pid_tracker_destroy(struct lttng_pid_tracker *lpf);
+bool lttng_pid_tracker_lookup(struct lttng_pid_tracker *lpf, int pid);
+int lttng_pid_tracker_add(struct lttng_pid_tracker *lpf, int pid);
+int lttng_pid_tracker_del(struct lttng_pid_tracker *lpf, int pid);
+
+int lttng_session_track_pid(struct lttng_session *session, int pid);
+int lttng_session_untrack_pid(struct lttng_session *session, int pid);
+
 #if defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
 int lttng_syscalls_register(struct lttng_channel *chan, void *filter);
 int lttng_syscalls_unregister(struct lttng_channel *chan);