i want to obtain two different shared memories
 

Hi,
i m giving diiferent key values as the 1st argument in shmget() in two different files like, (key_t)12, (key_t)1234. But shmat() is attaching same memeroy address to different processes. Suppose i want two different shared memories for two different processes, then how it can be done. i have tried several possiblities for 1st argument of shmget(), but on doing shmat() i m getting same memory address.


ex:
first.c

main()
{

int *shm_mem, shmid ;

shmid = shmget((key_t)12, sizeof(int)*10, 0666 | IPC_CREAT) ;

shm_mem = shmat(shmid, (void*)0, 0 );

}

second.c

main()
{

int *shm_mem, shmid ;

shmid = shmget((key_t)"/test/test1.c", sizeof(int)*100, 0666 | IPC_CREAT ) ;

shm_mem = shmat(shmid, (void*)0, 0 ) ;

}


Now the problem is: i m getting same value of shm_mem, inspite i m using different key values in shmget().
How i can obtain two different shared memories ?

Use a different key.

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