Re: [Crash-utility] [PATCH] add a new command: ipcs
----- Original Message -----
Sorry, I made some mistake.
At 2012-4-11 17:06, qiaonuohan wrote:
>
> what is struct nsproxy? Or is there any symbol referring to ipc_ns?
I want to know how does the kernel get struct ipc_ids. the previous and
the hind kernel uses current->nsproxy->ipc_ns to get the pointer to
struct ipc_namespace and then use a macro shm_ids to get struct ipc_ids.
What about this kernel?
It does the same thing. But in the failure case, it appears that the
task_struct.nsproxy pointer that you are using is NULL:
>
> (c) On this 2.6.36-0.16.rc3.git0.fc15 Fedora kernel, it shows:
>
> ------ Shared Memory Segments ------
> KEY SHMID UID PERMS BYTES NATTCH
> STATUS
> ipcs: invalid kernel virtual address: 10 type: "nsproxy.ipc_ns"
>> (d) On *all* RHEL4 2.6.9-era and SLES9 2.6.5-era kernels,
the
>> command
>> fail like this:
>>
>> ------ Shared Memory Segments ------
>> KEY SHMID UID PERMS BYTES NATTCH STATUS
>> ipcs: invalid structure member offset: ipc_id_ary_p
>> FILE: ipcs.c LINE: 540 FUNCTION: ipc_search_array()
>>
>> or this:
>>
>> ------ Shared Memory Segments ------
>> KEY SHMID UID PERMS BYTES NATTCH STATUS
>> (none allocated)------ Semaphore Arrays --------
>> KEY SEMID UID PERMS NSEMS
>> ipcs: invalid structure member offset: ipc_id_ary_p
>> FILE: ipcs.c LINE: 540 FUNCTION: ipc_search_array()
>>
>
> what is struct ipc_id? And what is entries in struct ipc_id or something
> similar to it?
I mean struct ipc_ids, not ipc_id.
RHEL4/linux-2.6.9:
crash> ipc_ids
struct ipc_ids {
int size;
int in_use;
int max_id;
short unsigned int seq;
short unsigned int seq_max;
struct semaphore sem;
struct ipc_id *entries;
}
SIZE: 56
crash>
Dave