[ts-7000] Shared Memory between User Space App and 2.4 Kernel Module

["marv.schwartz" <>]

Hi,

How can a tslinux 2.4 kernel module and an application both access shared 
memory? In the app, a shared memory block is created or opened in the the 
following code:

#define SHMKEY (ftok("KWHdata", 0x1e))

typedef struct shMem {
   int state;
   long elapsedSecs;
   int counter1;
   int counter2;
   int counter3;
   int counter4;
} sharedMem;

sharedMem *getSharedMem() {
   int shmid = shmget(SHMKEY, sizeof(sharedMem), IPC_CREAT | IPC_EXCL | 0x660); 
// try to create shared memory
   if (shmid == -1) shmid = shmget(SHMKEY, sizeof(sharedMem), 0); // create 
failed--try to use existing shared memory
   if (shmid == -1) {
       perror("Error assigning shared memory");
       exit(1);
   }
   return shmat(shmid, 0, 0);
}

How is the same shared memory accessed from a tslinux 2.4 kernel module (on a 
ts-7250)? Are there equivalent routines to ftok and shmget?

The kernel module increments the counters on interrupts. The app needs 
read-only access to the counters.

Thanks,

Marv




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