Maximum uid and how to indicate "any user"
Maximum uid and how to indicate "any user"
- Subject: Maximum uid and how to indicate "any user"
- From: Greg Hurrell <email@hidden>
- Date: Sun, 10 Jul 2005 23:25:26 +0200
A quick question and a request for a word of advice... Can someone
direct me to a header where I can find the maximum possible uid under
Darwin? The only reference I can find on the net is this old one:
http://sourceforge.net/mailarchive/message.php?msg_id=1673516
Which in turn makes reference to an Apple document which now 404s...
http://www.apple.com/macosx/server/pdf/UnderstandingUsingNetInfo.pdf
That document apparently says that the maximum uid is 2,147,483,647.
The reason I ask is that I am writing some methods which take a uid_t
argument and I want to come up with a safe value that can be passed
to indicate "any user". In "/usr/include/sys/types.h" uid_t is
defined as having type u_int32_t. I notice that on my clean Tiger
install user "nobody" has uid -2, but obviously "nobody" and "any
user" aren't the same thing. So I am wondering if -1 would be a safe
value to use to stand for "any user".
Greg
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