src/lib/lttng-ctl/condition.c

   1 /*
   2  * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * This library is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU Lesser General Public License, version 2.1 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This library 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 Lesser General Public License
  11  * for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public License
  14  * along with this library; if not, write to the Free Software Foundation,
  15  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16  */
  17
  18 #include <lttng/condition/condition-internal.h>
  19 #include <common/macros.h>
  20 #include <stdbool.h>
  21 #include <assert.h>
  22
  23 enum lttng_condition_type lttng_condition_get_type(
  24                 struct lttng_condition *condition)
  25 {
  26         return condition ? condition->type : LTTNG_CONDITION_TYPE_UNKNOWN;
  27 }
  28
  29 void lttng_condition_destroy(struct lttng_condition *condition)
  30 {
  31         if (!condition) {
  32                 return;
  33         }
  34
  35         assert(condition->destroy);
  36         condition->destroy(condition);
  37 }
  38
  39 LTTNG_HIDDEN
  40 bool lttng_condition_validate(struct lttng_condition *condition)
  41 {
  42         bool valid;
  43
  44         if (!condition) {
  45                 valid = false;
  46                 goto end;
  47         }
  48
  49         if (!condition->validate) {
  50                 /* Sub-class guarantees that it can never be invalid. */
  51                 valid = true;
  52                 goto end;
  53         }
  54
  55         valid = condition->validate(condition);
  56 end:
  57         return valid;
  58 }
  59
  60 LTTNG_HIDDEN
  61 ssize_t lttng_condition_serialize(struct lttng_condition *condition, char *buf)
  62 {
  63         ssize_t ret, condition_size;
  64         struct lttng_condition_comm condition_comm;
  65
  66         if (!condition) {
  67                 ret = -1;
  68                 goto end;
  69         }
  70
  71         condition_comm.condition_type = (int8_t) condition->type;
  72         ret = sizeof(struct lttng_condition_comm);
  73         if (buf) {
  74                 memcpy(buf, &condition_comm, ret);
  75                 buf += ret;
  76         }
  77
  78         condition_size = condition->serialize(condition, buf);
  79         if (condition_size < 0) {
  80                 ret = condition_size;
  81                 goto end;
  82         }
  83         ret += condition_size;
  84 end:
  85         return ret;
  86 }