Re: select() stress

[Sparks, Jamie]

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Date: Tue, 18 Mar 2003 09:49:31 -0500 (Eastern Standard Time)
From: Jamie Sparks <[e-mail]>
To: DervishD <[e-mail]>
cc: "Richard B. Johnson" <[e-mail]>,=20
    Linux kernel <[e-mail]>
Subject: Re: select() stress
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I cannot find a posix nor linux implementation of getdtablehi().

To get around it, I do the following:

int a =3D3D open("some_file_I_know_exists",O_RDWR);
close(a);

then use a as the 1st param to select().

perhaps it ought to be a+1?

Jamie

On Tue, 18 Mar 2003, DervishD wrote:

>       Hi Richard, again :)
>
>       In my last message I told you that getdtablesize() is not
>   reliable for closing all file descriptors, that its return value is
>   not necessarily related to the file descriptor index. Well, I =
forgot
>   to say that getdtablehi() effectively returns the index for the
>   largest file descriptor available to the process plus one, that is,
>   perfect for using with 'select()' and for closing all open files:
>
>       for(i=3D3D0; i<getdtablehi(); i++) close(i);
>
>       Is this implemented under Linux? I have a piece of software =
that
>   relies on the above (now it's written using getdtablesize(), which =
is
>   non-correct as you noted) for closing all file descriptors...
>
>       Thanks again for noting this, Richard :)
>
>       Ra=3DFAl N=3DFA=3DF1ez de Arenas Coronado
>
>   --
>   Linux Registered User 88736
>   http://www.pleyades.net & http://www.pleyades.net/~raulnac
>

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