+ else
+ ret = -ENOSYS;
+ if (args.channel.wakeup_fd >= 0) {
+ int close_ret;
+
+ lttng_ust_lock_fd_tracker();
+ close_ret = close(args.channel.wakeup_fd);
+ lttng_ust_unlock_fd_tracker();
+ args.channel.wakeup_fd = -1;
+ if (close_ret)
+ PERROR("close");
+ }
+ free(args.channel.chan_data);
+ break;
+ }
+ case LTTNG_UST_STREAM:
+ {
+ int close_ret;
+
+ /* Receive shm_fd, wakeup_fd */
+ ret = ustcomm_recv_stream_from_sessiond(sock,
+ NULL,
+ &args.stream.shm_fd,
+ &args.stream.wakeup_fd);
+ if (ret) {
+ goto error;
+ }
+
+ if (ops->cmd)
+ ret = ops->cmd(lum->handle, lum->cmd,
+ (unsigned long) &lum->u,
+ &args, sock_info);
+ else
+ ret = -ENOSYS;
+ if (args.stream.shm_fd >= 0) {
+ lttng_ust_lock_fd_tracker();
+ close_ret = close(args.stream.shm_fd);
+ lttng_ust_unlock_fd_tracker();
+ args.stream.shm_fd = -1;
+ if (close_ret)
+ PERROR("close");
+ }
+ if (args.stream.wakeup_fd >= 0) {
+ lttng_ust_lock_fd_tracker();
+ close_ret = close(args.stream.wakeup_fd);
+ lttng_ust_unlock_fd_tracker();
+ args.stream.wakeup_fd = -1;
+ if (close_ret)
+ PERROR("close");
+ }
+ break;
+ }
+ case LTTNG_UST_CONTEXT:
+ switch (lum->u.context.ctx) {
+ case LTTNG_UST_CONTEXT_APP_CONTEXT:
+ {
+ char *p;
+ size_t ctxlen, recvlen;
+
+ ctxlen = strlen("$app.") + lum->u.context.u.app_ctx.provider_name_len - 1
+ + strlen(":") + lum->u.context.u.app_ctx.ctx_name_len;
+ if (ctxlen >= LTTNG_UST_SYM_NAME_LEN) {
+ ERR("Application context string length size is too large: %zu bytes",
+ ctxlen);
+ ret = -EINVAL;
+ goto error;
+ }
+ strcpy(ctxstr, "$app.");
+ p = &ctxstr[strlen("$app.")];
+ recvlen = ctxlen - strlen("$app.");
+ len = ustcomm_recv_unix_sock(sock, p, recvlen);
+ switch (len) {
+ case 0: /* orderly shutdown */
+ ret = 0;
+ goto error;
+ default:
+ if (len == recvlen) {
+ DBG("app context data received");
+ break;
+ } else if (len < 0) {
+ DBG("Receive failed from lttng-sessiond with errno %d", (int) -len);
+ if (len == -ECONNRESET) {
+ ERR("%s remote end closed connection", sock_info->name);
+ ret = len;
+ goto error;
+ }
+ ret = len;
+ goto error;
+ } else {
+ DBG("incorrect app context data message size: %zd", len);
+ ret = -EINVAL;
+ goto error;
+ }