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         if (session->ust_session) {
  45                 switch (session->ust_session->buffer_type) {
  46                 case LTTNG_BUFFER_PER_PID:
  47                         ERR("Clear command not supported for per-pid buffers.");
  48                         ret = LTTNG_ERR_CLEAR_NOT_AVAILABLE;
  49                         goto error;
  50                 case LTTNG_BUFFER_PER_UID:
  51                 case LTTNG_BUFFER_GLOBAL:
  52                         break;
  53                 }
  54         }
  55
  56         /*
  57          * Clear kernel and UST session buffers and local files (if any).
  58          */
  59         if (session->kernel_session) {
  60                 ret = kernel_clear_session(session);
  61                 if (ret != LTTNG_OK) {
  62                         goto error;
  63                 }
  64         }
  65         if (session->ust_session) {
  66                 ret = ust_app_clear_session(session);
  67                 if (ret != LTTNG_OK) {
  68                         goto error;
  69                 }
  70         }
  71
  72         /*
  73          * Clear remote (relayd) session files.
  74          */
  75         ret = consumer_clear_session(session);
  76         if (ret < 0) {
  77                 ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER;
  78                 goto error;
  79         }
  80         ret = LTTNG_OK;
  81 error:
  82 end:
  83         return ret;
  84 }