src/bin/lttng-sessiond/clear.c

   1 /*
   2  * Copyright (C) 2019 - Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <inttypes.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 #include <common/defaults.h>
  25 #include <common/error.h>
  26 #include <common/utils.h>
  27
  28 #include "clear.h"
  29 #include "session.h"
  30 #include "ust-app.h"
  31 #include "kernel.h"
  32
  33
  34 int cmd_clear_session(struct ltt_session *session)
  35 {
  36         int ret;
  37
  38         if (!session->has_been_started) {
  39                  /* Nothing to be cleared, do not warn */
  40                  ret = LTTNG_OK;
  41                  goto end;
  42         }
  43
  44         /*
  45          * Unsupported feature in lttng-relayd before 2.12.
  46          */
  47         if (session->consumer->type == CONSUMER_DST_NET &&
  48                         (session->consumer->relay_major_version == 2 &&
  49                         session->consumer->relay_minor_version < 12)) {
  50                 ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE_RELAY;
  51                 goto end;
  52         }
  53
  54         /* TODO: Should we check for disallowed here or consumer side? */
  55
  56         /* Snapshot session are the only one supported for now */
  57         if (!session->snapshot_mode) {
  58                 /*
  59                  * TODO: this error code is temporary and will be removed since
  60                  * we will be supporting all session type
  61                  */
  62                 ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE;
  63                 goto end;
  64         }
  65
  66         if (session->kernel_session) {
  67                 ret = kernel_clear_session(session);
  68                 if (ret != LTTNG_OK) {
  69                         goto error;
  70                 }
  71         }
  72         if (session->ust_session) {
  73                 ret = ust_app_clear_session(session);
  74                 if (ret != LTTNG_OK) {
  75                         goto error;
  76                 }
  77         }
  78 error:
  79 end:
  80         return ret;
  81 }