|
From: | Martin Koeppe |
Subject: | Re: Fwd: Re: error.c: "Unknown system error" should report errno value |
Date: | Wed, 3 Oct 2007 17:22:03 +0200 (CEST) |
On Wed, 3 Oct 2007, Jim Meyering wrote:
Martin Koeppe <address@hidden> wrote:A question arises: How should one portably test for "root"? Neither "root" nor uid 0 seem to be a POSIX requirement. I found one solution so far, but I'm not sure how good it really is: For shell scripts run: $ /usr/sbin/chroot / /bin/true If successful, you have root rights.I'm leery of this. What if chroot works for non-privileged users on some type of system? Since Interix is the problem here, how about adding a test that'd be run solely on that system?
Yes, no problem with that. I only thought there might be a possibility to check the root-ness without an explicit comparison of uid or username. This need not necessarily be the chroot() function. But I don't know the POSIX standard in that detail.
If you want an explicit check, then for Interix 3 different users/uids must be checked: System (uid ???), Domain Administrator (uid 1049076) and local Administrator (uid 197108). All of these have "root" rights.
See: http://www.interopcommunity.com/faqs.aspx#307 Martin
[Prev in Thread] | Current Thread | [Next in Thread] |