/*
    ICPDAS(R) Modbus Shared Memory Header 
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#define MBS_DI "mbs_di"
#define MBS_DO "mbs_do"
#define MBS_AI "mbs_ai"
#define MBS_AO "mbs_ao"
typedef enum {DO,DI,AI,AO} IO_TYPE;
int shm_id[4];
int *iMemory_DO;
int *iMemory_AO;
int *iMemory_AI;
int *iMemory_DI;

#define SHM_INIT(IO,SIZE)                                                                           \
do{                                                                                                 \
    if ((shm_id[IO]= shm_open(MBS_##IO, (O_CREAT | O_EXCL | O_RDWR),S_IRWXU )) > 0 ) {              \
        ftruncate(shm_id[IO], SIZE*sizeof(int));                                                    \
    }else if ((shm_id[IO]= shm_open(MBS_##IO, (O_CREAT | O_RDWR),S_IRWXU)) < 0){                    \
        perror("shm_open");                                                                         \
    }                                                                                               \
     iMemory_##IO=mmap(NULL,SIZE*sizeof(int),PROT_READ|PROT_WRITE,MAP_SHARED,shm_id[IO],0L);        \
     if (iMemory_##IO == MAP_FAILED) {                                                              \
         perror("mmap");                                                                            \
        exit(0);                                                                                    \
    }                                                                                               \
    if(close(shm_id[IO])<0){                                                                        \
        perror("shm_id close failed\n");                                                            \
    }                                                                                               \
}while(0)                                                                                           \