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Old 04-28-2006, 03:02 AM   #1
ankurcse
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Registered: Mar 2006
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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 ?
 
Old 04-28-2006, 09:38 AM   #2
sundialsvcs
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Use a different key.
 
Old 04-28-2006, 01:03 PM   #3
jtshaw
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Please do not post the same thread in more than one forum. Picking the most relevant forum and posting it once there makes it easier for other members to help you and keeps the discussion all in one place.

http://www.linuxquestions.org/rules.php
 
  


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