tomg_tt wrote:

> I'm having a 'problem' I'm not sure how to deal with. I have a
> client/server system that makes high reuse of sockets. I use a table
> to keep state information, and use the socket fds as the index into
> this table. As the sockets open and close, some sockets are re-used,
> but the trend is allways to get higher numbered fds for a socket.
> Eventually the fd is greater than the size of the table. This is
> regardless of how large I make my table. Of course, periodically I
> check all open sockets, and if there has been no activity for some
> period of time, I close the socket, but for the most part, the lower
> numbers never get re-used. Yes, I can hash the fd to get an offset,
> but I'm wondering why I don't just get the lower, unused fd number.

On Linux, 'socket' and 'accept' will *always* give you the lowest
unused non-negative integer. If you get 5, that means zero through four
were all in use as sockets or files.

There are a few possibilities, but one may be that your program has a
file descriptor or socket leak. It could be in completely unrelated
code to the code you think you have a problem with. A missing 'close',
'fclose', or 'pclose' could be the culprit.

Every call to 'socket' or 'accept' must have a matching call to
'close', even if the connection itself is already the closed, the
descriptor still references it.

DS

You can use netstat -np to check the socket you have already opened.
Maybe something is leak.

ABAI

On 11ÔÂ11ÈÕ, ÉÏÎç7ʱ33·Ö, "tomg_tt" wrote:
> I'm having a 'problem' I'm not sure how to deal with. I have a
> client/server system that makes high reuse of sockets. I use a table
> to keep state information, and use the socket fds as the index into
> this table. As the sockets open and close, some sockets are re-used,
> but the trend is allways to get higher numbered fds for a socket.
> Eventually the fd is greater than the size of the table. This is
> regardless of how large I make my table. Of course, periodically I
> check all open sockets, and if there has been no activity for some
> period of time, I close the socket, but for the most part, the lower
> numbers never get re-used. Yes, I can hash the fd to get an offset,
> but I'm wondering why I don't just get the lower, unused fd number.
>
> tia,
> Tom
>
> please reply at
> tgreen.at.nospam.contentwatch.nospam.com
> to email remove the each .nospam, and convert at appropriately