/*----------------------------------------------------------------------------*/
/* libdatastr.h                                                               */
/*----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------*/
/* This file is part of LibDataStr.                                           */
/*                                                                            */
/*    LibDataStr is free software: you can redistribute it and/or modify it   */
/*    under the terms of the GNU Lesser General Public License as published   */
/*    by the Free Software Foundation, either version 3 of the License, or    */
/*    (at your option) any later version.                                     */
/*                                                                            */
/*    LibDataStr is distributed in the hope that it will be useful,           */
/*    but WITHOUT ANY WARRANTY; without even the implied warranty of          */
/*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the            */
/*    GNU Lesser General Public License for more details.                     */
/*                                                                            */
/*    You should have received a copy of the GNU Lesser General Public        */
/*    License along with LibDataStr. If not, see                              */
/*    <https://www.gnu.org/licenses/>.                                        */
/*----------------------------------------------------------------------------*/



/*----------------------------------------------------------------------------*/
/* Includes                                                                   */
/*----------------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/sem.h>
#include <sys/ipc.h>

//#include <ver.h>

#include <node.h>
#include <datastr.h>







/*----------------------------------------------------------------------------*/
/* Definitions                                                                */
/*----------------------------------------------------------------------------*/

#define LGD_MODULE_NAME "ds"




extern char * strdup ( const char *  );

/* Compteur d'ouverture de la librairie */

unsigned int DS_Open_Counter = 0;

/* Tous les heaps créés via la librairie LIBDATASTR seront préfixés par le nom suivant */

#define DS_PREFIX  "DATASTR"

/* Flux de sortie des messages d'erreur */

FILE * DS_stderr;

/*
    Pour gérer les ouvertures, fermetures ou destructions d'une data structure, on
    opère sur un sémaphore (OpenSemID) rattaché à la description de la structure
    qui comptabilise les processus ayant ouvert la data structure.
*/

struct sembuf DS_SemOp_Open [1] = { {0, 1, SEM_UNDO|IPC_NOWAIT} };
struct sembuf DS_SemOp_Close [1] = { {0, -1, SEM_UNDO|IPC_NOWAIT} };
struct sembuf DS_SemOp_Destroy [2] = { {0, -1, SEM_UNDO|IPC_NOWAIT}, {0, 0, SEM_UNDO|IPC_NOWAIT} };

typedef union semun {
    int                     val;
    struct semid_ds *       buf;
    unsigned short int *    array;
} semun;



/* Liste des data structure ouvertes par le processus courant */

NDT_Root  *OpenedDS_List;

typedef struct DST_DataStruct
{
    char      *Name;
    NDT_Root  *Root_Ptr;
} DST_DataStruct;



/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/*                     Fonctions privées de la librairie                      */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------*/
/* Création d'un sémaphore pour gérer l'ouverture d'une data structure        */
/*----------------------------------------------------------------------------*/

DST_Status DS_Semaphore_Create( NDT_Root  *);



/*----------------------------------------------------------------------------*/
/* Opération sur un sémaphore                                                 */
/*----------------------------------------------------------------------------*/

DST_Status DS_Semaphore_Operate (int, struct sembuf  *, unsigned int);



/*----------------------------------------------------------------------------*/
/* Fonction d'allocation attachée à une structure de données :                */
/*----------------------------------------------------------------------------*/

DST_Status DS_DataStruct_Alloc ( void  **Ptr, size_t  Size, void  *Data );



/*----------------------------------------------------------------------------*/
/* Fonction de désallocation attachée à une structure de données :            */
/*----------------------------------------------------------------------------*/

DST_Status  DS_DataStruct_Free ( void  *Ptr, void  *Data );



/*----------------------------------------------------------------------------*/
/* Routine d'affichage d'un message d'erreur                                  */
/*----------------------------------------------------------------------------*/
void DS_Error_Print ( void );



/*----------------------------------------------------------------------------*/
/* Pour préfixer les noms de heap avec l'identifiant de la librairie          */
/*----------------------------------------------------------------------------*/

DST_Status  DS_Name_Prefix( char  *Prefixed, const char  *Unprefixed);



/*----------------------------------------------------------------------------*/
/* Teste si une data structure a déjà été ouverte par le processus courant    */
/*----------------------------------------------------------------------------*/

DST_Status DS_DataStruct_IsOpen( NDT_Root  **Root_Ptr_Ptr, char  *DS_Name);



/*----------------------------------------------------------------------------*/
/* Fonction manager de la liste des DS ouvertes                               */
/*----------------------------------------------------------------------------*/

NDT_Status DS_OpenedDS_List_Manager( NDT_Root  *Root_Ptr, NDT_Index_Id  Index_Id, NDT_Node  *Node_Ptr, NDT_Command  Command, va_list  *Args_Ptr);