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Re: Mailbox locking
- To: firstname.lastname@example.org
- Subject: Re: Mailbox locking
- From: email@example.com (Viktor Pavlenko)
- Date: 23 Apr 2001 17:40:09 +0900
- Content-Type: text/plain; charset="ISO-2022-JP"
- Reply-To: firstname.lastname@example.org
- Resent-From: email@example.com
- Resent-Message-ID: <ydnPp.A.46F.firstname.lastname@example.org>
- Resent-Sender: email@example.com
Thank you for reply. At least sgid+x is clear. As for sgid-x /usr/src/linux/Documentation/mandatory.txt on my RH7 system reads: >A file is marked as a candidate for mandatory locking by setting >the group-id bit in its file mode but removing the group-execute >bit. This is an otherwise meaningless combination, and was chosen >by the System V implementors so as not to break existing user programs. And... yes I have to read some man/info pages before typing any more:) Viktor >>>>>> "Viktor" == Viktor Pavlenko <firstname.lastname@example.org> writes: > > Viktor> Can anyone shed some light on s (=sgid+x) and S (=sgid-x) > Viktor> things? > >becomes the gid of the owner"??? > >suid = Set User ID. This means the effective user of the process is >set to the owner of the executable file, and the process has the same >permissions that the file owner has for the purpose of checking the >user mode. > >sgid = Set Group ID. Same as suid except substitute group for owner. > >These are pretty meaningless if x is not set, but for orthogonality's >sake you can do chmod 2666 file if ya really wanna. > >On some systems, you can do chmod 1nnn. This is called the "sticky" >bit, and that is the one that calls for mandatory locking. > >When these are directories, they have different meanings. An "suid" >directory is meaningless (IIRC), an sgid directory means "use my >permissions as default when you create children in me", and a >directory with the sticky bit set restricts certain directory >manipulations to the owner of the directory or file. > >Look up stat(2). (No, chmod(2) isn't a lot of help, and chmod(1) is >only a little bit more. ;-) > >Info may be better than man.
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