trackers: support tracking feature

[lttng-tools.git] / src / bin / lttng-sessiond / client.c

diff --git a/src/bin/lttng-sessiond/client.c b/src/bin/lttng-sessiond/client.c
index 30ec1111998e44e85bb3c498014710d3903486b3..ae027d5e0d35a1b7bddb4b391d6feeb12aceb27a 100644 (file)
--- a/src/bin/lttng-sessiond/client.c
+++ b/src/bin/lttng-sessiond/client.c
@@ -789,7 +789,7 @@ static int process_client_msg(struct command_ctx *cmd_ctx, int *sock,
        case LTTNG_LIST_CHANNELS:
        case LTTNG_LIST_EVENTS:
        case LTTNG_LIST_SYSCALLS:
-       case LTTNG_LIST_TRACKER_PIDS:
+       case LTTNG_LIST_TRACKER_IDS:
        case LTTNG_DATA_PENDING:
        case LTTNG_ROTATE_SESSION:
        case LTTNG_ROTATION_GET_INFO:
@@ -1205,18 +1205,100 @@ error_add_context:
                                kernel_poll_pipe[1]);
                break;
        }
-       case LTTNG_TRACK_PID:
+       case LTTNG_TRACK_ID:
        {
-               ret = cmd_track_pid(cmd_ctx->session,
-                               cmd_ctx->lsm->domain.type,
-                               cmd_ctx->lsm->u.pid_tracker.pid);
+               struct lttng_tracker_id id;
+
+               memset(&id, 0, sizeof(id));
+               id.type = cmd_ctx->lsm->u.id_tracker.id_type;
+               switch (id.type) {
+               case LTTNG_ID_ALL:
+                       break;
+               case LTTNG_ID_VALUE:
+                       id.value = cmd_ctx->lsm->u.id_tracker.u.value;
+                       break;
+               case LTTNG_ID_STRING:
+               {
+                       const size_t var_len = cmd_ctx->lsm->u.id_tracker.u.var_len;
+
+                       id.string = zmalloc(var_len);
+                       if (!id.string) {
+                               ret = LTTNG_ERR_NOMEM;
+                               goto error;
+                       }
+                       DBG("Receiving var len tracker id string from client");
+                       ret = lttcomm_recv_unix_sock(*sock, id.string, var_len);
+                       if (ret <= 0) {
+                               DBG("Nothing received");
+                               *sock_error = 1;
+                               free(id.string);
+                               ret = LTTNG_ERR_INVALID;
+                               goto error;
+                       }
+                       if (strnlen(id.string, var_len) != var_len - 1) {
+                               DBG("String received as tracker ID is not NULL-terminated");
+                               free(id.string);
+                               ret = LTTNG_ERR_INVALID;
+                               goto error;
+                       }
+                       break;
+               }
+               default:
+                       ret = LTTNG_ERR_INVALID;
+                       goto error;
+               }
+               ret = cmd_track_id(cmd_ctx->session,
+                               cmd_ctx->lsm->u.id_tracker.tracker_type,
+                               cmd_ctx->lsm->domain.type, &id);
+               free(id.string);
                break;
        }
-       case LTTNG_UNTRACK_PID:
+       case LTTNG_UNTRACK_ID:
        {
-               ret = cmd_untrack_pid(cmd_ctx->session,
-                               cmd_ctx->lsm->domain.type,
-                               cmd_ctx->lsm->u.pid_tracker.pid);
+               struct lttng_tracker_id id;
+
+               memset(&id, 0, sizeof(id));
+               id.type = cmd_ctx->lsm->u.id_tracker.id_type;
+               switch (id.type) {
+               case LTTNG_ID_ALL:
+                       break;
+               case LTTNG_ID_VALUE:
+                       id.value = cmd_ctx->lsm->u.id_tracker.u.value;
+                       break;
+               case LTTNG_ID_STRING:
+               {
+                       const size_t var_len = cmd_ctx->lsm->u.id_tracker.u.var_len;
+
+                       id.string = zmalloc(var_len);
+                       if (!id.string) {
+                               ret = LTTNG_ERR_NOMEM;
+                               goto error;
+                       }
+                       DBG("Receiving var len tracker id string from client");
+                       ret = lttcomm_recv_unix_sock(*sock, id.string, var_len);
+                       if (ret <= 0) {
+                               DBG("Nothing received");
+                               *sock_error = 1;
+                               free(id.string);
+                               ret = LTTNG_ERR_INVALID;
+                               goto error;
+                       }
+                       if (strnlen(id.string, var_len) != var_len - 1) {
+                               DBG("String received as tracker ID is not NULL-terminated");
+                               free(id.string);
+                               ret = LTTNG_ERR_INVALID;
+                               goto error;
+                       }
+                       break;
+               }
+               default:
+                       ret = LTTNG_ERR_INVALID;
+                       goto error;
+               }
+               ret = cmd_untrack_id(cmd_ctx->session,
+                               cmd_ctx->lsm->u.id_tracker.tracker_type,
+                               cmd_ctx->lsm->domain.type, &id);
+               free(id.string);
                break;
        }
        case LTTNG_ENABLE_EVENT:
@@ -1442,27 +1524,65 @@ error_add_context:
                ret = LTTNG_OK;
                break;
        }
-       case LTTNG_LIST_TRACKER_PIDS:
+       case LTTNG_LIST_TRACKER_IDS:
        {
-               int32_t *pids = NULL;
-               ssize_t nr_pids;
-
-               nr_pids = cmd_list_tracker_pids(cmd_ctx->session,
-                               cmd_ctx->lsm->domain.type, &pids);
-               if (nr_pids < 0) {
+               struct lttcomm_tracker_command_header cmd_header;
+               struct lttng_tracker_id *ids = NULL;
+               ssize_t nr_ids, i;
+               struct lttng_dynamic_buffer buf;
+
+               nr_ids = cmd_list_tracker_ids(
+                               cmd_ctx->lsm->u.id_tracker.tracker_type,
+                               cmd_ctx->session, cmd_ctx->lsm->domain.type,
+                               &ids);
+               if (nr_ids < 0) {
                        /* Return value is a negative lttng_error_code. */
-                       ret = -nr_pids;
+                       ret = -nr_ids;
                        goto error;
                }
 
-               /*
-                * Setup lttng message with payload size set to the event list size in
-                * bytes and then copy list into the llm payload.
-                */
-               ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids,
-                       sizeof(int32_t) * nr_pids);
-               free(pids);
+               lttng_dynamic_buffer_init(&buf);
+               for (i = 0; i < nr_ids; i++) {
+                       struct lttng_tracker_id *id = &ids[i];
+                       struct lttcomm_tracker_id_header id_hdr;
+                       size_t var_data_len = 0;
+
+                       memset(&id_hdr, 0, sizeof(id_hdr));
+                       id_hdr.type = id->type;
+                       switch (id->type) {
+                       case LTTNG_ID_ALL:
+                               break;
+                       case LTTNG_ID_VALUE:
+                               id_hdr.u.value = id->value;
+                               break;
+                       case LTTNG_ID_STRING:
+                               id_hdr.u.var_data_len = var_data_len =
+                                               strlen(id->string) + 1;
+                               break;
+                       default:
+                               ret = LTTNG_ERR_INVALID;
+                               goto error;
+                       }
+                       ret = lttng_dynamic_buffer_append(
+                                       &buf, &id_hdr, sizeof(id_hdr));
+                       if (ret) {
+                               ret = LTTNG_ERR_NOMEM;
+                               goto error;
+                       }
+                       ret = lttng_dynamic_buffer_append(
+                                       &buf, id->string, var_data_len);
+                       if (ret) {
+                               ret = LTTNG_ERR_NOMEM;
+                               goto error;
+                       }
+                       free(id->string);
+               }
 
+               cmd_header.nb_tracker_id = nr_ids;
+               ret = setup_lttng_msg(cmd_ctx, buf.data, buf.size, &cmd_header,
+                               sizeof(cmd_header));
+               free(ids);
+               lttng_dynamic_buffer_reset(&buf);
                if (ret < 0) {
                        goto setup_error;
                }