endOfMibView is an SNMPexception, right? if endOfMibView occurs in SNMPv3, what will be the value of the error-status parameter in the PDU? Is there any RFC regarding this matter?
In SNMPv1, "noSuchName" is set to the error-status.
Thanks for answering!
Actually, no... endOfMibView is an exception added to the varbind value itself when it's hit. This is done so that an endOfMibView can occur along side a real variable as well. In the SNMPv2 PDU structure, documented in RFC3416, you'll find the definition.
If it set the error-status you'd have to refetch the rest of the variables since it would be a true error and would stop the entire processing sequence. Having it as an in-line exception means that the other variable fetches can proceed still.
Related
I would like to know if it is possible to reset the thread context (all of its variables) at the begining of a new iteration.
The problem that I am having is that the thread keeps all the variables (and its values) from its previous iterations and sometimes it things can get messy.
If I am not mistaken, on VisualStudio Performance tests you can specify the percentage of "new users" to indicate how many VirtualUsers are going to have its contexts reseted on their next test iteration.
Do we have something similar native on JMeter or do we need to write some code to do it?
Thanks in advance!
I'm not sure you really want/need it, but you can remove all JMeter variables using JSR223 script with remove method:
for (Map.Entry entry : vars.entrySet()) {
vars.put(entry.getKey(), null);
}
It depends on the type of variables you create and how you use them.
For ex:
Regular Expression Extractor
Here It creates a variable regex.var and if the response matches the expression it will have some value assigned to it. If the next iteration does not match the expression, It will still keep the previous iteration value. To avoid this problem, assign a default value or check the 'Use empty default value'. so that every iteration will basically reset the value.
User Designed Variables - Each and every thread will have its own copy of the variable and threads could be modifying its variable value throughout the entire duration of the test. If you want that to be reset for every iteration, it is completely your responsibility.
I think this could be helpful.
JMeter - Understanding Variables Scope
I am working on the Agent side of SNMP, and I have a field that is a DateAndTime, which has the syntax:
DateAndTime (OCTET STRING) (SIZE (8 |11)). Hint: 2d-1d-1d,1d:1d:1d.1d,1a1d:1d
The varBind in question returns the timestamp of a certain type of error, which (hopefully) will never happen.
So my question is what the agent should return if the event has not occurred. If I return an empty string, the constraints technically aren't met.
I am not an SNMP expert, so maybe this acceptable?
Changing the MIB to a different definition/Type is a possibility, if that is what I need to do.
The agent should return an error for the incoming requests, by setting error-status to a suitable value (genErr for example), and also set error-index to the proper index in the varbind.
PDU ::= SEQUENCE {
request-id INTEGER (-214783648..214783647),
error-status -- sometimes ignored
INTEGER {
noError(0),
tooBig(1),
noSuchName(2), -- for proxy compatibility
badValue(3), -- for proxy compatibility
readOnly(4), -- for proxy compatibility
genErr(5),
noAccess(6),
wrongType(7),
wrongLength(8),
wrongEncoding(9),
wrongValue(10),
noCreation(11),
inconsistentValue(12),
resourceUnavailable(13),
commitFailed(14),
undoFailed(15),
authorizationError(16),
notWritable(17),
inconsistentName(18)
},
error-index -- sometimes ignored
INTEGER (0..max-bindings),
variable-bindings -- values are sometimes ignored
VarBindList
}
The MIB should define EXACTLY what happens in all circumstances. It is the contract between the agent and manager. If it does not, it is a faulty MIB. If it is a MIB that someone is developing, it needs to be fixed. If it is a public MIB, tell us which, so we can check.
At the moment I encountered SQLSetConnectAttrW call with attribute constant equal to either 0 or 1(SQLSetConnectAttrW(0x1231231, 0, 0, -6)). And so I cannot distinguish what is actual SQL_ATTR_* define name so that I can refer to it further. I tried to look through ODBC header files, but ended up with no success in finding what this could be. So my question is what are these constants names?
PS: ADO internally makes this sort of call and I have to figure out what is this being made for.
Best regards, Alexander Chernyaev.
If you are seeing SQLSetConnectAttr(0xNNNNNNNN, 0, 0, -6) then the first argument is a connection handle (a pointer), the second is the attribute to set (I'm not aware of an attribute of value 0), the 3rd is irrelevant and the 4th is SQL_IS_INTEGER implying it is a numeric attribute. Are you sure it is attempting to set attribute 0? Where did you get that information from?
These two attributes are SQL_ATTR_MAX_ROWS and SQL_ATTR_QUERY_TIMEOUT and it's ok to pass them to connection handle as #bohica stated before.
Am trying to read the lotus notes document using VB6.I can able to read the values of the but suddenly type mismatch error is throwed.When i reintialise the vb6 variable it works but stops after certain point.
ex; address field in lotus notes
lsaddress=ImsField(doc.address)
private function ImsField(pValue)
ImsField=pValue(0)
end function
Like this I am reading the remaining fields but at certain point the runtime error "13" type mismatch error throwed.
I have to manually reintialize by
set doc=view.getdocumentbykey(doclist)
The type mismatch error occurs for a certain field. The issue should be a data type incompatibility. Try to figure out which field causes the error.
Use GetItemValue() instead of short notation for accessing fields and don't use ImsField():
lsaddress=doc.GetItemValue("address")(0)
The type mismatch is occurring because you are encountering a case where pValue is not an array. That will occur when you attempt to reference a NotesItem that does not exist. I.e., doc.MissingItem.
You should not use the shorthand notation doc.itemName. It is convenient, but it leads to sloppy coding. You should use getItemValue as everyone else is suggesting, and also you should check to see if the NotesItem exists. I.e.,
if doc.hasItem("myItem") then
lsaddress=doc.getItemValue("myItem")(0)
end if
Notes and Domino are schema-less. There are no data integrity checks other than what you write yourself. You may think that the item always has to be there, but the truth is that there is nothing that will ever guarantee that, so it is always up to you to write your code so that it doesn't assume anything.
BTW: There are other checks that you might want to perform besides just whether or not the field exists. You might want to check the field's type as well, but to do that requires going one more level up the object chain and using getFirstItem instead of getItemValue, which I'm not going to get into here. And the reason, once again, is that Notes and Domino are schema-less. You might think that a given item must always be a text list, but all it takes is someone writing sloppy code in an one-time fix-it agent and you could end up having a document in which that item is numeric!
Checking your fields is actually a good reason (sometimes) to encapsulate your field access in a function, much like the way you have attempted to do. The reason I added "sometimes" above is that your code's behavior for a missing field isn't necessarily always going to be the same, but for cases where you just want to return a default value when the field doesn't exist you can use something like this:
lsaddress ImsField("address","")
private function ImsField(fieldName,defaultValue)
if doc.hasItem(fieldName) then
lsaddress=doc.getItemValue(fieldName)(0)
else
lsaddress=defaultValue
end if
end function
Type mismatch comes,
When you try to set values from one kind of datatype variable to different datatype of another variable.
Eg:-
dim x as String
Dim z as variant
z= Split("Test:XXX",":")
x=z
The above will through the error what you mentioned.
So check the below code...
lsaddress = ImsField(doc.address)
What is the datatype of lsaddress?
What is the return type of ImsField(doc.address)?
If the above function parameter is a string, then you should pass the parameter like (doc.address(0))
I want to add an entry to process control block structure (task_struct). Let say a way to tag some process. I want to initialize this field to 0 for all the process except "some special processes", later by calling sched_setscheduler() I will set this flag for the "special processes".
Does anybody have an idea how to assign a default value to a member variable in task_struct?
I'm assuming you are talking about a recent Linux kernel, because implementation detail changes over time.
There are two options. The first - you can set the value of the variable in the init_task global. See how it is done in the linux/init_task.h header. The second option is to add code to copy_process, which you might want to do anyway in order to properly handle the fork() inheritance of the field you are adding.