[squeak-dev] accessing file permissions within the image

Chris Muller asqueaker at gmail.com
Fri Jul 10 18:46:54 UTC 2015

Dave, I would like to say, OSProcess is one fine package!  I keep
getting surprised at the cool things (like RemoteTask) in there.  It
seems to have become a permanent part of my images.

On Wed, Jul 8, 2015 at 9:37 PM, David T. Lewis <lewis at mail.msen.com> wrote:
> On Wed, Jul 08, 2015 at 11:43:50PM +0200, Levente Uzonyi wrote:
>> On Wed, 8 Jul 2015, Chris Muller wrote:
>> >
>> >Is it possible to determine the Linux file permissions of a file or
>> >directory from within the image running on Linux?
>> >
>> IIRC the Pharo guys have added that feature to their version of
>> FilePlugin.
> OSProcess accessor fileStat: '/etc/hosts' ==> #(0 0 #(0 6 4 4))
> The primitive is in UnixOSProcessPlugin, and is accessed like this:
> UnixOSProcessAccessor>>primFileStat: aPathString
>         "Call stat(2) to obtain the file protection mask for a file. Answer errno on failure,
>         or on success answer an array with: UID with: GID with: protectionMask. The
>         protectionMask is an Array of four integers representing the protection mask, or
>         answer errno on failure. The protection mask is four Integers, each of which may
>         be considered an octal digit (0-7), with bit values 4, 2, and 1. The first digit selects
>         the set user ID (4) and set group ID (2) and save text image (1) attributes. The second
>         digit selects permissions for the user who owns the file: read (4), write (2), and
>         execute (1); the third selects permissions for other users in the file's group, with
>         the same values; and the fourth for other users not in the file's group, with the
>         same values."
>         <primitive: 'primitiveFileStat' module: 'UnixOSProcessPlugin'>
>         ^ nil
> Dave

More information about the Squeak-dev mailing list