Re: Read only files.

["John E. Davis" <davis@xxxxxxxxxxxxx>]

Misha Gorodnitzky <misaka@xxxxxxxxx> wrote:
>Not as root I don't. Only when the file is truly un-writable, such as  
>when I edit a 0444 file as a non-privileged user, jed does as you  
>say. I'm using 0.99.16, by the way, I don't have 0.99.17 anywhere to  
>try out.

To determine if a file is to be regarded as read-only, the `access`
system call is used.  Unfortunately, this system call appears to
indicate that root has write permission to a file even if it has not
permission bits set.

The next release will contain a patch using the stat system to obtain
the permission bits, and explicitly test those.

In the meantime, you can use the global_mode_hook to perform this test:

   define global_mode_hook (mode_name)
   {
      variable file = buffer_filename ();
      variable st = stat_file (file);
      if (st != NULL)
	set_readonly (0 == (st.st_mode & S_IWUSR));
   }

Hopefully this will work for you.
  
Thanks,
--John


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