Hi Dave,
Thanks for your reply.
I am working with template code which was generated from
mib2c.iterate_access.conf.
Because of performance issue, I get the external data(PHY register values)
in each column's get_ routine like following:
ex:
char *get_xDSLSCStatusPerBinActualMaxTxPsd(void *data_context, size_t
*ret_len)
{
int port_num;
int shm_id;
char *ptr;
xDSLSCStatusEntry *entry_ptr = (xDSLSCStatusEntry *)data_context;
port_num = IFIX_TRANSFORM_TO_PORT_ID(entry_ptr->ifIndex);
shm_id = SEND_GET_REQ_TO_DSL_TSK(port_num, GSMIB_xDSLSCStatusTable,
GSMIB_xDSLSCStatusPerBinActualMaxTxPsd, NULL, 0, 1,
entry_ptr->xDSLSCStatusDirection, 0xff, 0xff);
if(shm_id == 1)
{
printf("shm_id = 1\n");
return NULL;
}
else
{
ptr = (char *)shmat(shm_id, NULL, 0);
if((int)ptr == -1)
{
printf("shmat fail\n");
return NULL;
}
memcpy(entry_ptr->xDSLSCStatusPerBinActualMaxTxPsd, ptr, 1024 *
sizeof(char));
if(shmdt(ptr) == -1)
perror(" detach error ");
shmctl(shm_id, IPC_RMID, NULL);
*ret_len = strlen(entry_ptr->xDSLSCStatusPerBinActualMaxTxPsd);
return (char *)(entry_ptr->xDSLSCStatusPerBinActualMaxTxPsd); /**
XXX: replace this with a pointer to a real value */
}
}
Function SEND_GET_REQ_TO_DSL_TSK() was used to get external data, it will
return a share memory id when everything is correct.
Otherwise it will return 1 when there's an error occured during getting
external data.
I find that if shm_id = 1, get_ routine will return NULL and there will be a
segmentation fault.
Is there anything wrong in my get_ routine?
Or it's a net-snmp 5.1.1's bug?
Thanks,
永鈦鑫 iTAS Corporation
新竹市水源街75號
NO. 75,Shuiyuan St., Hsinchu City, Taiwan, R.O.C.
Tel:03-5716099 Ext.1208
E-mail:tewen.hs...@itas.com.tw
----- Original Message -----
From: "Dave Shield" <d.t.shi...@liverpool.ac.uk>
To: "Tewen Hsieh" <tewen.hs...@itas.com.tw>
Cc: <net-snmp-coders@lists.sourceforge.net>
Sent: Monday, August 17, 2009 7:25 PM
Subject: Re: Could anyone give me some suggestions?
2009/8/17 Tewen Hsieh <tewen.hs...@itas.com.tw>:
> But there's segmentation fault when it returns NULL in get_ routine.
> Is it a normal result?
It's never normal for the agent to crash.
> Additionally, how can I inducate that there's an error when fail getting
> external data?
> I mean in the template code which was generated from
> mib2c.iterate_access.conf, where can I return the
> error-status(SNMP_ERR_GENERR, etc.) for get requests?
What does the code look like?
We can't make suggestions if we don't know what code
you are working with.
Dave
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