extern "C" {
#endif
+#include <lttng/constant.h>
+
+struct lttng_handle;
struct lttng_session_descriptor;
struct lttng_destruction_handle;
*
* The structures should be initialized to zero before use.
*/
-#define LTTNG_SESSION_PADDING1 12
+#define LTTNG_SESSION_PADDING1 8
struct lttng_session {
char name[LTTNG_NAME_MAX];
/*
uint32_t snapshot_mode;
unsigned int live_timer_interval; /* usec */
+ /*
+ * End of public attributes.
+ * The remaining fields are used to deal with ABI management concerns.
+ */
+
+ /*
+ * 32-bit architectures are already naturally aligned on 4 bytes after
+ * 'live_timer_interval'. However, the offset does not result in a
+ * natural alignment on 64-bit architectures. Adding 4 bytes of
+ * padding here results in an aligned offset after 'alignement_padding'
+ * for both bitnesses.
+ *
+ * This was added since not all compilers appear to align unions in the
+ * same way. Some (e.g. MSVC) do not seem to impose an alignement
+ * constraint while others (e.g. gcc, clang, icc) seem to align it to
+ * ensure 'ptr' is naturally aligned.
+ */
+ char alignment_padding[4];
union {
+ /*
+ * Ensure the 'extended' union has the same size for both
+ * 32-bit and 64-bit builds.
+ */
char padding[LTTNG_SESSION_PADDING1];
void *ptr;
} extended;
* an lttng_destruction_handle which can be used to wait for the completion
* of the session's destruction. The lttng_destroy_handle can also be used
* obtain the status and archive location of any implicit session
- * rotation that may have occured during the session's destruction.
+ * rotation that may have occurred during the session's destruction.
*
* Returns LTTNG_OK on success. The returned handle is owned by the caller
* and must be free'd using lttng_destruction_handle_destroy().
extern int lttng_set_session_shm_path(const char *session_name,
const char *shm_path);
-/*
- * Add PID to session tracker.
- *
- * A pid argument >= 0 adds the PID to the session tracker.
- * A pid argument of -1 means "track all PIDs".
- *
- * Return 0 on success else a negative LTTng error code.
- */
-extern int lttng_track_pid(struct lttng_handle *handle, int pid);
-
-/*
- * Remove PID from session tracker.
- *
- * A pid argument >= 0 removes the PID from the session tracker.
- * A pid argument of -1 means "untrack all PIDs".
- *
- * Return 0 on success else a negative LTTng error code.
- */
-extern int lttng_untrack_pid(struct lttng_handle *handle, int pid);
-
-/*
- * List PIDs in the tracker.
- *
- * enabled is set to whether the PID tracker is enabled.
- * pids is set to an allocated array of PIDs currently tracked. On
- * success, pids must be freed by the caller.
- * nr_pids is set to the number of entries contained by the pids array.
- *
- * Returns 0 on success, else a negative LTTng error code.
- */
-extern int lttng_list_tracker_pids(struct lttng_handle *handle,
- int *enabled, int32_t **pids, size_t *nr_pids);
-
#ifdef __cplusplus
}
#endif