Date: Mon, 2 Dec 2013 07:10:11 +0000 From: Venkata Duvvuru <VenkatKumar.Duvvuru@Emulex.Com> To: John-Mark Gurney <jmg@funkthat.com> Cc: Matthew Fleming <mdf@freebsd.org>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: RE: sysctl add macros Message-ID: <BF3270C86E8B1349A26C34E4EC1C44CB2C7E46D7@CMEXMB1.ad.emulex.com> In-Reply-To: <20131130213006.GC55638@funkthat.com> References: <BF3270C86E8B1349A26C34E4EC1C44CB2C7E0C74@CMEXMB1.ad.emulex.com> <CAMBSHm9K_Yu9SDdHP1exh99RXq9tta7kwVWQbEY_zs2ZJa5RjQ@mail.gmail.com> <BF3270C86E8B1349A26C34E4EC1C44CB2C7E0D3E@CMEXMB1.ad.emulex.com> <20131130213006.GC55638@funkthat.com>
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I could use an int variable but if I have to dump huge number of statistics through sysctl in which case I need to add many such variables to the nodes and even if most of these variables are char I have to declare them as int, hence resulting in an increased footprint.
/Venkat.
-----Original Message-----
From: John-Mark Gurney [mailto:jmg@funkthat.com]
Sent: Sunday, December 01, 2013 3:00 AM
To: Venkata Duvvuru
Cc: Matthew Fleming; freebsd-current@freebsd.org
Subject: Re: sysctl add macros
Venkata Duvvuru wrote this message on Mon, Nov 25, 2013 at 14:58 +0000:
> The problem with using int or u_int for 1 or 2 byte values is that while printing these 1 or 2 byte values I observed that sysctl module is considering 4 bytes. Hence I see an undesired output. It is actually considering the next two bytes also as the value.
If you _NEED_ to use a char or short, you need to write your own/clone it from the macros...
Why can't you use an int for this variable?
> From: mdf356@gmail.com [mailto:mdf356@gmail.com] On Behalf Of Matthew
> Fleming
> Sent: Monday, November 25, 2013 8:18 PM
> To: Venkata Duvvuru
> Cc: freebsd-current@freebsd.org
> Subject: Re: sysctl add macros
>
> On Mon, Nov 25, 2013 at 3:35 AM, Venkata Duvvuru <VenkatKumar.Duvvuru@emulex.com<mailto:VenkatKumar.Duvvuru@emulex.com>> wrote:
> Hi,
> I'm unable to figure out how to add an unsigned short or an unsigned char values to a sysctl node.
> SYSCTL_ADD_INT, SYSCTL_ADD_UINT, etc., are present but to add a char or a short values I couldn't find any macros.
>
> Could you please let me know how to add them?
>
> FreeBSD does not have any sysctl handlers for 1 or 2 byte values. FreeBSD code that wants to do this has used int or u_int instead of a smaller type.
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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