Implement PID tracking

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

diff --git a/lttng-events.h b/lttng-events.h
index cf5acafab8348d7937623bb1376f118ed7827589..7d3314590384906fbd95b2406f593c59d1806cd0 100644 (file)
--- a/lttng-events.h
+++ b/lttng-events.h
@@ -167,6 +167,7 @@ struct lttng_ctx {
        struct lttng_ctx_field *fields;
        unsigned int nr_fields;
        unsigned int allocated_fields;
+       size_t largest_align;   /* in bytes */
 };
 
 struct lttng_event_desc {
@@ -323,6 +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 ? */
@@ -333,6 +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;
 };
 
@@ -398,6 +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);
@@ -405,6 +428,9 @@ int lttng_syscall_filter_enable(struct lttng_channel *chan,
                const char *name);
 int lttng_syscall_filter_disable(struct lttng_channel *chan,
                const char *name);
+long lttng_channel_syscall_mask(struct lttng_channel *channel,
+               struct lttng_kernel_syscall_mask __user *usyscall_mask);
+int lttng_abi_syscall_list(void);
 #else
 static inline int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
 {
@@ -416,20 +442,36 @@ static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
        return 0;
 }
 
+static inline
 int lttng_syscall_filter_enable(struct lttng_channel *chan,
                const char *name)
 {
        return -ENOSYS;
 }
 
+static inline
 int lttng_syscall_filter_disable(struct lttng_channel *chan,
                const char *name)
 {
        return -ENOSYS;
 }
+
+static inline
+long lttng_channel_syscall_mask(struct lttng_channel *channel,
+               struct lttng_kernel_syscall_mask __user *usyscall_mask)
+{
+       return -ENOSYS;
+}
+
+static inline
+int lttng_abi_syscall_list(void)
+{
+       return -ENOSYS;
+}
 #endif
 
 struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
+void lttng_context_update(struct lttng_ctx *ctx);
 int lttng_find_context(struct lttng_ctx *ctx, const char *name);
 void lttng_remove_context_field(struct lttng_ctx **ctx,
                                struct lttng_ctx_field *field);
@@ -556,6 +598,7 @@ void lttng_ftrace_destroy_private(struct lttng_event *event)
 int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
 
 extern const struct file_operations lttng_tracepoint_list_fops;
+extern const struct file_operations lttng_syscall_list_fops;
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
 #define TRACEPOINT_HAS_DATA_ARG