Re: 'out of range' error in FD_SET

[Scott Klement <sk@xxxxxxxxxxxxxxxx>]

Sender: Scott Klement <sk@xxxxxxxxxxxxxxxx>


That's an interesting dilemna.  You're creating a new socket descriptor 
until you reach the maximum capacity of a descriptor set ("fdset").

I suppose I could increase the capacity of the descriptor set, but all 
that'd do is make it take a little longer to fail, it wouldn't solve the 
problem.

The question is, why aren't the sockets getting closed so that they can be 
reused? I'm going to have to see if I can duplicate the error so that I 
can try to trace the reason why things aren't getting cleaned up properly.

---
Scott Klement  http://www.scottklement.com

On Tue, 8 Nov 2005 jthompson@xxxxxxxxxxx wrote:

> I have a program doing an ftp_list every 5 minutes, monitoring a remote
> directory.
>
> At about the same time every day, I get message " Length or start position
> is out of range for the string operation." issued by procedure FD_SET.
> The call stack looks like this:
>
> ftp_list -->  ftp_lstraw --> get_byline --> bufline --> fd_set.
>
> The file descriptor passed to fd_set has a value of 224.
>
> Just prior to the call to the line that fails - it's a %subst - there's a
> call to proc CalcBitPos which returns a value of 32. It's this value of 32
> that is being used as the starting position by the %subst on a field with
> length of only 28 that's causing the error.
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