Date: Mon, 13 Mar 2000 12:13:19 +1100 From: Peter Jeremy <peter.jeremy@alcatel.com.au> To: Paul Richards <paul@originative.co.uk> Cc: current@FreeBSD.ORG Subject: Re: MAX_UID ? Message-ID: <00Mar13.121319est.115208@border.alcanet.com.au> In-Reply-To: <38CC3D6F.73152D6D@originative.co.uk>; from paul@originative.co.uk on Mon, Mar 13, 2000 at 12:01:03PM %2B1100 References: <38CAD957.3C839375@originative.co.uk> <200003120430.UAA49807@vashon.polstra.com> <38CB322D.D12ED0B0@originative.co.uk> <20000313015009.A5653@hades.hell.gr> <38CC30FB.FC417909@originative.co.uk> <200003130018.TAA32652@khavrinen.lcs.mit.edu> <38CC3D6F.73152D6D@originative.co.uk>
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On 2000-Mar-13 12:01:03 +1100, Paul Richards <paul@originative.co.uk> wrote:
>id = strtoul(p, (char **)NULL, 10);
> if ((errno == ERANGE) || (id >= UID_MAX)) {
> warnx("%s > max uid value (%lu)", p, UID_MAX);
> return (0);
>}
You can do this now. Just add the following:
pid_t UID_MAX = ~0;
somewhere before the code.
>When you see it written out like that the latter is a lot more
>informative. It also provides the flexibility to limit the parameters
>max value even if the type allows it to be larger. This is of particular
>significance to UIDs which are currently limited to a far smaller value
>than would fit in a uid_t.
AFAIK, there's no real hard limit. adduser(8) limits uids to 32000
to prevent portability problems with systems using a signed 16-bit
uid_t (whilst allowing for a few `special' uids near the top of the
range). Other potential limits are ~65000 (16-bit unsigned) and
99999 (5 decimal digits).
It would be nice if there was a system-wide constant that could be
used for this, but it's not obvious where this should be located.
(And note that adduser(8) is a perl script, so it can't use a C
header file without some contortions).
Peter
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