Import kernel control interface

[lttng-tools.git] / liblttsessiondcomm / liblttsessiondcomm.h

diff --git a/liblttsessiondcomm/liblttsessiondcomm.h b/liblttsessiondcomm/liblttsessiondcomm.h
index e51b813175203516a5f73b309bf7949246279a97..4e86cc5475b6a11804079ac3344a453e61a8a6d6 100644 (file)
--- a/liblttsessiondcomm/liblttsessiondcomm.h
+++ b/liblttsessiondcomm/liblttsessiondcomm.h
@@ -24,6 +24,8 @@
 #include <limits.h>
 #include <uuid/uuid.h>
 
+#include "lttng-share.h"
+
 #define LTTNG_RUNDIR                                           "/var/run/lttng"
 
 /* Default unix socket path */
@@ -45,7 +47,13 @@
  */
 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_OK)
 
-enum lttcomm_command_type {
+enum lttcomm_sessiond_command {
+       KERNEL_CREATE_CHANNEL,
+       KERNEL_CREATE_SESSION,
+       KERNEL_DISABLE_EVENT,
+       KERNEL_ENABLE_EVENT,
+       KERNEL_START_TRACE,
+       KERNEL_STOP_TRACE,
        LTTNG_CREATE_SESSION,
        LTTNG_DESTROY_SESSION,
        LTTNG_FORCE_SUBBUF_SWITCH,
@@ -92,6 +100,15 @@ enum lttcomm_return_code {
        LTTCOMM_SELECT_SESS,    /* Must select a session */
        LTTCOMM_EXIST_SESS,             /* Session name already exist */
        LTTCOMM_NR,                             /* Last element */
+       KCONSUMERD_COMMAND_SOCK_READY,  /* when kconsumerd command socket ready */
+       KCONSUMERD_SUCCESS_RECV_FD,     /* success on receiving fds */
+       KCONSUMERD_ERROR_RECV_FD,       /* error on receiving fds */
+       KCONSUMERD_POLL_ERROR,  /* Error in polling thread in kconsumerd */
+       KCONSUMERD_POLL_NVAL,   /* Poll on closed fd */
+       KCONSUMERD_POLL_HUP,    /* All fds have hungup */
+       KCONSUMERD_EXIT_SUCCESS,        /* kconsumerd exiting normally */
+       KCONSUMERD_EXIT_FAILURE,        /* kconsumerd exiting on error */
+       KCONSUMERD_OUTFD_ERROR, /* error opening the tracefile */
 };
 
 /* commands for kconsumerd */
@@ -109,55 +126,45 @@ enum lttcomm_kconsumerd_fd_state {
 };
 
 /*
- * Data structure for ltt-session received message
+ * Data structure received from lttng client to session daemon.
  */
 struct lttcomm_session_msg {
-       /* Common data to almost all command */
-       enum lttcomm_command_type cmd_type;
-       uuid_t session_id;
+       u32 cmd_type;    /* enum lttcomm_sessiond_command */
+       uuid_t session_uuid;
        char trace_name[NAME_MAX];
        char session_name[NAME_MAX];
-       pid_t pid;
+       u32 pid;    /* pid_t */
        union {
                struct {
                        int auto_session;
                } create_session;
                /* Marker data */
                struct {
-                       char channel[NAME_MAX];
-                       char marker[NAME_MAX];
-               } marker;
-               /* SET_SOCK_PATH */
-               struct {
-                       char sock_path[PATH_MAX];
-               } sock_path;
-               /* SET_SUBBUF_NUM */
-               struct {
-                       unsigned int subbuf_num;
-                       char channel[NAME_MAX];
-               } subbuf_num;
-               /* SET_SUBBUF_SIZE */
+                       char event_name[NAME_MAX];
+               } event;
+               /* Create channel kernel */
                struct {
-                       unsigned int subbuf_size;
-                       char channel[NAME_MAX];
-               } subbuf_size;
+                       int overwrite;
+                       u64 subbuf_size;
+                       u64 num_subbuf;
+                       unsigned int switch_timer_interval;
+                       unsigned int read_timer_interval;
+               } create_channel;
        } u;
 };
 
 /*
- * Data structure for the lttng client response.
- *
- * This data structure is the control struct use in
- * the header of the transmission. NEVER put variable
- * size data in here.
+ * Data structure for the response from sessiond to the lttng client.
  */
 struct lttcomm_lttng_msg {
-       enum lttcomm_command_type cmd_type;
-       enum lttcomm_return_code ret_code;
-       uuid_t session_id;
-       pid_t pid;
-       char trace_name[NAME_MAX];
-       unsigned int size_payload;
+       u32 cmd_type;   /* enum lttcomm_sessiond_command */
+       u32 ret_code;   /* enum lttcomm_return_code */
+       u32 pid;        /* pid_t */
+       u32 trace_name_offset;
+       u32 data_size;
+       uuid_t session_uuid;
+       /* Contains: trace_name + data */
+       char payload[];
 };
 
 /*
@@ -167,9 +174,9 @@ struct lttcomm_lttng_msg {
  * how many lttcomm_kconsumerd_msg it is about to receive
  */
 struct lttcomm_kconsumerd_header {
-       unsigned int payload_size;
-       enum lttcomm_consumerd_command cmd_type;
-       enum lttcomm_return_code ret_code;
+       u32 payload_size;
+       u32 cmd_type;   /* enum lttcomm_consumerd_command */
+       u32 ret_code;   /* enum lttcomm_return_code */
 };
 
 /* lttcomm_kconsumerd_msg represents a file descriptor to consume the
@@ -178,7 +185,8 @@ struct lttcomm_kconsumerd_header {
 struct lttcomm_kconsumerd_msg {
        char path_name[PATH_MAX];
        int fd;
-       enum lttcomm_kconsumerd_fd_state state;
+       u32 state;    /* enum lttcomm_kconsumerd_fd_state */
+       unsigned long max_sb_size; /* the subbuffer size for this channel */
 };
 
 extern int lttcomm_create_unix_sock(const char *pathname);