* Md Lazreg wrote on Thu, Jan 08, 2009 at 15:11 +0100:
> The problem in my case was a server one. I use a non-blocking socket for the
> server to receive information from the clients, so the server performs a
> select with a timeout of 1 second to read information. It turns out that
> when they are network issues, 1 second is not enough and the select times
> out with a 0 return value, so the server was assuming that the client is
> gone and closes the connection....
>
> Now, when the select times out I check the errno and if it is EAGAIN, I try
> select again... This solved the problem and all clients now are handled
> correctly...
>
> What confused me is the man select documentation which states that select
> sets errno only if the return value is -1... it seems that even if it
> returns 0 errno might be set...
>
> I have seen this problem on Linux and Hp platforms...
errno always has a value. It might be defined (if a function
returned -1) or a `random' value (such as 11, EAGAIN or whatever,
usually highly predictable :)).
My man page seems to be very clear about select timing out with a 0
return value:
RETURN VALUE
On success, select and pselect return the number of
descriptors contained in the descriptor sets, which may be
zero if the timeout expires before anything interesting
happens.
I think usually the `client is gone', `connection closed' or `end
of file' situation is when select(2) does return `read for read' for
this file descriptor and read(2) returns zero [from man 2 read: `On
success, the number of bytes read is returned (zero indicates
end of file)'].
oki,
Steffen
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