IPCRM(1) BSD General Commands Manual IPCRM(1)NAME
ipcrm -- remove the specified message queues, semaphore sets, and shared memory segments
SYNOPSIS
ipcrm [-M shmkey] [-m shmid] [-Q msgkey] [-q msqid] [-S semkey] [-s semid] ...
DESCRIPTION
ipcrm removes the specified message queues, semaphores, and shared memory segments. These System V IPC objects can be specified by their
creation ID or any associated key.
The following options are used to specify which IPC objects will be removed. Any number and combination of these options can be used:
-M shmkey
Mark the shared memory segment associated with key shmkey for removal. This marked segment will be destroyed after the last detach.
-m shmid
Mark the shared memory segment associated with ID shmid for removal. This marked segment will be destroyed after the last detach.
-Q msgkey
Remove the message queue associated with key msgkey from the system.
-q msqid
Remove the message queue associated with the ID msqid from the system.
-S semkey
Remove the semaphore set associated with key semkey from the system.
-s semid
Removes the semaphore set associated with ID semid from the system.
If the id or key argument is ``all'' then all entries of the appropriate type are removed.
The identifiers and keys associated with these System V IPC objects can be determined by using ipcs(1).
SEE ALSO ipcs(1), shmat(2), shmctl(2), shmdt(2), shmget(2)BSD May 31, 2008 BSD
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ipcrm(1) BSD General Commands Manual ipcrm(1)NAME
ipcrm -- remove the specified message queues, semaphore sets, and shared memory segments
SYNOPSIS
ipcrm [-M shmkey] [-m shmid] [-Q msgkey] [-q msqid] [-S semkey] [-s semid] ...
DESCRIPTION
Ipcrm removes the specified message queues, semaphores and shared memory segments. These System V IPC objects can be specified by their cre-
ation id or any associated key.
The following options are used to specify which IPC objects will be removed. Any number and combination of these options can be used:
-M shmkey
Mark the shared memory segment associated with key shmkey for removal. This marked segment will be destroyed after the last detach.
-m shmid
Mark the shared memory segment associated with id shmid for removal. This marked segment will be destroyed after the last detach.
-Q msgkey
Remove the message queue associated with key msgkey from the system.
-q msqid
Remove the message queue associated with the id msqid from the system.
-S semkey
Remove the semaphore set associated with key semkey from the system.
-s semid
Removes the semaphore set associated with id semid from the system.
The identifiers and keys associated with these System V IPC objects can be determined by using ipcs(1)SEE ALSO ipcs(1)BSD August 8, 1994 BSD
This is on HP UNIX version 11. I have a shared memory segment that is marked for deallocation .... see below
m 521 0x00000000 D-rw-rw---- oracle dba
The D says it marked for deallocation. I tried to do the ipcrm -m 521. The message said it cannot find the segment. I assume... (1 Reply)
Dear Reader,
Is is necessary to attach / dettach the shared memory segments for write operations , if more than one program is accessing same shared memory segments..
I have used semaphore mutex and still I'm getting segmentation fault when I write to the segment when other program is already... (1 Reply)
Hi everyone!
I need your help.
When i run ipcs -m -a for display shared memory status i see an entry with key 0xdeadbeef:
IPC status from /dev/kmem as of Tue Feb 3 15:55:14 2004
T ID KEY MODE OWNER GROUP CREATOR CGROUP NATTCH SEGSZ CPID LPID ATIME ... (3 Replies)
hi all,
I'm working on this problem for 2 days. Can somebody tell me that how to delete all message queues from the system ?
Since "ipcs -q" gives the list of all existing message queue, then there must be a system call and data stucture where from I can fetch the data about all existing... (2 Replies)
Hello,
With next simple command line I get all allocated semaphore numbers:
ipcs -s | awk 'NR > 3 {print $2}'
Now I want to add ipcrm -s before each semaphore id and actually delete every last of them.
The question is: Can I do the operation in a command itself, without redirecting awk... (2 Replies)
Hello ...I want to understand the basics of advance unix .that is about icp's,message queues, sockets..
.can anyone please provide me a good link which will explain about IPC etc. (1 Reply)
Hi,
Anyone knows whether it is possible to link/relate an IPC semaphore to a particular process ID?
e.g.
# ipcs -as
IPC status from <running system> as of Wednesday July 2 14:10:39 EST 2008
T ID KEY MODE OWNER GROUP CREATOR CGROUP NSEMS OTIME CTIME... (8 Replies)
Hi all,
Is there a situation like system assigning same ID's for semaphores and shared memory at the same time.
Ex: When I try to create 10 Shared memory objects with starting key as 0x1500 and 10 semaphore objects with starting key as 0x1234 in the same program. Assume those are not deleted... (2 Replies)
I'm facing a problem interpreting the shared memory key on an AIX machine.
(1) I go to a property file and I see the following:
shm_key = "119112066"
(2) So I now go the command prompt and do this:
ipcs -m | grep 119112066
And, I do not find it. So what I do is to run the... (2 Replies)
I am trying to run myApplication which allocates Some amount of shared memory at startup.
It failed because not available shared memory are available.
But when i ran,
ipcs -m
it is displaying empty(i.e no shared memory allocated in system.)
Why "ipcs -m" is displaying empty ?
... (5 Replies)
Hi!
I wanted to know the advantages / disadvantages of different IPC mechanims such as sockets, pipes (unnamed) , shared memory & message queues.
Pipes for example i hear are fast , but are difficult to debug as compared to sockets.
Can you guys please name some situations where one is... (4 Replies)
Hi,
we have multiple database instances running on solaris server like db1, db2 and db3. Below shown ipcs -pmb shared memory segment output. Using cpid value I want to relate to the database instances db1, db2 and db3. Please let me know how to do this?
$ ipcs -pmb
IPC status from <running... (9 Replies)