Date: Sun, 1 Dec 2013 23:14:36 -0800 From: John-Mark Gurney <jmg@funkthat.com> To: Venkata Duvvuru <VenkatKumar.Duvvuru@Emulex.Com> Cc: Matthew Fleming <mdf@freebsd.org>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: sysctl add macros Message-ID: <20131202071436.GI55638@funkthat.com> In-Reply-To: <BF3270C86E8B1349A26C34E4EC1C44CB2C7E46D7@CMEXMB1.ad.emulex.com> References: <BF3270C86E8B1349A26C34E4EC1C44CB2C7E0C74@CMEXMB1.ad.emulex.com> <CAMBSHm9K_Yu9SDdHP1exh99RXq9tta7kwVWQbEY_zs2ZJa5RjQ@mail.gmail.com> <BF3270C86E8B1349A26C34E4EC1C44CB2C7E0D3E@CMEXMB1.ad.emulex.com> <20131130213006.GC55638@funkthat.com> <BF3270C86E8B1349A26C34E4EC1C44CB2C7E46D7@CMEXMB1.ad.emulex.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Venkata Duvvuru wrote this message on Mon, Dec 02, 2013 at 07:10 +0000: > 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. If it's a few 10s of vars, then it isn't a big deal, but if it is 1000's, then you might want to look at another method to extract the data since the overhead of sysctl is expensive... Something like writing a _PROC routine that will copy them all out in a single sysctl call.. > -----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." > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20131202071436.GI55638>