Very Computer

by **nea** » Fri, 22 Apr 1994 12:02:31

Does anyone see anyproblem in making the MAXUID on the limit.h
to 200000.

by **Mike Elliso** » Fri, 22 Apr 1994 17:37:34

|> Does anyone see anyproblem in making the MAXUID on the limit.h
|> to 200000.
|>

You could have problems with accounting etc as some unix systems only hold
a 2 byte user identifier giving a maximum of 2**16 (65536) possible uids,
before you get overlap. It seems on solaris that the uid has been increased
to a 4 byte value in accounting records but thta won't help interoperatability
with non solaris systems.

by **Joerg Czerans** » Sat, 23 Apr 1994 06:43:18

> Does anyone see anyproblem in making the MAXUID on the limit.h
> to 200000.

Hm, you don't say, which OS.
You can't do this on SunOS 4.1.3.

To quote from /usr/include/sys/types.h:
typedef unsigned short uid_t;

However, on SunOS 5.x, the definition is changed to 'long'.
There may be problems with NFS and other programs that might
still rely on the fact that uids were stored in 'short's.

joerg

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by **Peter Van E** » Sat, 23 Apr 1994 08:06:35

> Does anyone see anyproblem in making the MAXUID on the limit.h
>to 200000.

Many machines use an int (i.e. 16 bits) for the UID and thus the
maximum possible UID is 65535.
Many machines (NeXTs for instance, and some versions of SunOS) have
trouble with UIDs greater than 32767 (since they use a signed int as the uid).
Various programs on a NeXT won't work for a user with a UID greater than
32767.
I believe that Posix mandates a 32 bit UID, and that at least AIX
supports 32 bit UIDs.

Peter Van Epp / Operations and Technical Support
Simon Fraser University, Burnaby, B.C. Canada

by **Casper H.S. D** » Sat, 23 Apr 1994 17:06:36

>To quote from /usr/include/sys/types.h:
>typedef unsigned short uid_t;
>However, on SunOS 5.x, the definition is changed to 'long'.
>There may be problems with NFS and other programs that might
>still rely on the fact that uids were stored in 'short's.

But still, all places in the kernel that matter hardwite
the value 60000 as max.

Casper

by **Paul Flinde** » Sun, 24 Apr 1994 00:48:25

> Does anyone see anyproblem in making the MAXUID on the limit.h
>to 200000.

Well if your uid_t is 16 bits you might have problems
eg on an SGI running Irix 4.0.5f

smee$ grep uid_t /usr/include/sys/types.h
/usr/include/sys/types.h:typedef u_short uid_t;

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by **nea** » Mon, 25 Apr 1994 11:58:41

: smee$ grep uid_t /usr/include/sys/types.h
: /usr/include/sys/types.h:typedef u_short uid_t;

The following is from the HP 700 and 800 that I am working on
types.h: typedef long uid_t; /* For user IDs */

Very Computer

UID > 60,000

UID > 60,000

UID > 60,000

UID > 60,000

UID > 60,000

UID > 60,000

UID > 60,000

UID > 60,000