text: /*
   * Copyright (C) 2022 Red Hat
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this list
   * of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice, this
   * list of conditions and the following disclaimer in the documentation and/or other
   * materials provided with the distribution.
   *
   * 3. Neither the name of the copyright holder nor the names of its contributors may
   * be used to endorse or promote products derived from this software without specific
   * prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
   * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
   * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* pgagroal */
  #include <pgagroal.h>
  #include <logging.h>
  #include <memory.h>
  #include <message.h>
  #ifdef DEBUG
  #include <utils.h>
  #endif
  
  /* system */
  #ifdef DEBUG
  #include <assert.h>
  #endif
  #include <errno.h>
  #include <stdlib.h>
  #include <string.h>
  
  static struct message* message = NULL;
  static void* data = NULL;
  
  /**
   *
   */
  void
  pgagroal_memory_init(void)
  {
     struct configuration* config;
  
  #ifdef DEBUG
     assert(shmem != NULL);
  #endif
  
     config = (struct configuration*)shmem;
  
     pgagroal_memory_size(config->buffer_size);
  }
  
  /**
   *
   */
  void
  pgagroal_memory_size(size_t size)
  {
     pgagroal_memory_destroy();
  
     message = (struct message*)malloc(sizeof(struct message));
     if (message == NULL)
     {
        goto error;
     }
  
     data = malloc(size);
     if (data == NULL)
     {
        goto error;
     }
  
     memset(message, 0, sizeof(struct message));
     memset(data, 0, size);
  
     message->kind = 0;
     message->length = 0;
     message->max_length = size;
     message->data = data;
  
     return;
  
  error:
  
     pgagroal_log_fatal("Unable to allocate memory");
  
  #ifdef DEBUG
     pgagroal_backtrace();
  #endif
  
     errno = 0;
  }
  
  /**
   *
   */
  struct message*
  pgagroal_memory_message(void)
  {
  #ifdef DEBUG
     assert(message != NULL);
     assert(data != NULL);
  #endif
  
     return message;
  }
  
  /**
   *
   */
  void
  pgagroal_memory_free(void)
  {
     size_t length;
  
  #ifdef DEBUG
     assert(message != NULL);
     assert(data != NULL);
  #endif
  
     length = message->max_length;
  
     memset(message, 0, sizeof(struct message));
     memset(data, 0, length);
  
     message->kind = 0;
     message->length = 0;
     message->max_length = length;
     message->data = data;
  }
  
  /**
   *
   */
  void
  pgagroal_memory_destroy(void)
  {
     free(data);
     free(message);
  
     data = NULL;
     message = NULL;
  }
  