Question about the difference of with and without SGID on directory

2007-05-31 Thread Patrick Dung 
Hi

I found Free/Net/OpenBSD semantic is different from Linux/Solaris.

Suppose there is a directory called 'directory,
With owner www, and group www and permission 0777.

Then I touch a file:
$ touch file
$ ls -la
total 4
drwxrwxrwx  2 www   www512 May 31 17:14 .
drwxrwxrwt  8 root  wheel  512 May 31 17:14 ..
-rw-r--r--  1 patrick   www  0 May 31 17:14 file
^^^
The file created will have a group owner of the owner of the directory
not the creator.

So I have two questions here:
1. So is there a difference with SGID on directory?
2. Any idea about why it is different from SYSV (Linux/Solaris)?

Thanks
Patrick


   
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Re: Question about the difference of with and without SGID on directory

2007-05-31 Thread Matthew Seaman 
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Patrick Dung wrote:
 Hi
 
 I found Free/Net/OpenBSD semantic is different from Linux/Solaris.
 
 Suppose there is a directory called 'directory,
 With owner www, and group www and permission 0777.
 
 Then I touch a file:
 $ touch file
 $ ls -la
 total 4
 drwxrwxrwx  2 www   www512 May 31 17:14 .
 drwxrwxrwt  8 root  wheel  512 May 31 17:14 ..
 -rw-r--r--  1 patrick   www  0 May 31 17:14 file
 ^^^
 The file created will have a group owner of the owner of the directory
 not the creator.
 
 So I have two questions here:
 1. So is there a difference with SGID on directory?

No.  BSDish behaviour of a directory with either mode drwxr-xr-x
or drwxr-sr-x is essentially identical to SysV/Linux-ish behaviour
with a directory mode drwxr-sr-x

 2. Any idea about why it is different from SYSV (Linux/Solaris)?

It's historic.  BSD has always worked that way and SysV has begged
to differ.

Cheers,

Matthew

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Dr Matthew J Seaman MA, D.Phil.   Flat 3
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