sysctl add macros

[Venkata Duvvuru]

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 at funkthat.com] 
Sent: Sunday, December 01, 2013 3:00 AM
To: Venkata Duvvuru
Cc: Matthew Fleming; freebsd-current at 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 at gmail.com [mailto:mdf356 at gmail.com] On Behalf Of Matthew 
> Fleming
> Sent: Monday, November 25, 2013 8:18 PM
> To: Venkata Duvvuru
> Cc: freebsd-current at freebsd.org
> Subject: Re: sysctl add macros
> 
> On Mon, Nov 25, 2013 at 3:35 AM, Venkata Duvvuru <VenkatKumar.Duvvuru at emulex.com<mailto:VenkatKumar.Duvvuru at 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."