Tags » Shared Memory

Clear semaphore memory

Sometimes I observed about using siteminder or other services semaphore memory even after service stopped remains into shared area.

This need to be cleared

e.g. if on unix machine your username is “digitaluser” then below is command… 14 more words

Infrastructure

I am receiving "shmat: permission denied" when attempting to attach to shared memory. Why?

I’m having a little trouble with shared memory, and could use a little guidance if someone could point me in the right direction.

// Allocate Shared Memory
key_t key = 56789;
int shmid;
char* shm_address;
int* value;

// Reserve the memory
if (shmid = shmget(key, sizeof(int), IPC_CREAT | 0777) < 0)
{
    perror("shmget was unsuccessful");
    exit(1);
}   
else
{
    printf("\nMemory created successfully:%d\n", shmid);
}

// Attach to memory address
if ( (shm_address = shmat(shmid, NULL, 0)) == (char *)-1 )
{

    perror("shmat was unsuccessful");
    exit(1);

}
else
{
    printf ("shared memory attached at address %p\n", shm_address);
}
… 115 more words
Linux

undefined reference to 'shm_open'

I’m trying to make a simple communicator, using shared memory.

It should be able to write some text and save it in shared memory.

Could someone explain to me why I get error: “undefined reference to `shm_open’ 269 more words

Linux

Muscle Memory

Today we hiked westward along Hadrian’s Wall from Cawfields Milecastle to Birdoswald. Retracing the steps of the Roman soldiers who patrolled this stretch of land makes one think about the power of repetitive action and its roll in remembrance. 428 more words