From: Daniel Berger <djberg96@...>
Date: 2009-05-09T01:01:01+09:00
Subject: Re: how to find and close opened file descriptor



On May 7, 9:54 am, Oliver Peng <oliver.p...@skywave.com> wrote:
> During my testing, I found that ruby doesn't create IO object for each
> opened file descriptor which are inherited from parent process. So we
> have to close all these opened file descriptor except stdin, stdout and
> stderr by following way:
>
>      3.upto(1023) do |fd|
>         begin
>           if io = IO::new(fd)
>             io.close
>           end
>         rescue
>         end
>       end
>
> But I really don't like this way. Is there better way that I can find
> all opened file descriptors.
>
> And now I am assuming the maximum file no is 1023. Is there any way that
> I can get the maximum file no?

The io-extra library might be able to help you, depending on your
platform.

gem install io-extra.

Take a look at the IO.closefrom and IO.fdwalk methods.

Regards,

Dan