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Re: Getting the User/Owner of another process

Subject: Re: Getting the User/Owner of another process
From: "Alastair J.Houghton" <email@hidden>
Date: Tue, 30 Sep 2003 16:31:16 +0100

On Tuesday, September 30, 2003, at 03:51 pm, John Farmer wrote:

I need to be able to get the User/Owner of another process, like Finder. I
need to do this because I need to get the user name of the person currently
logged in. Now before you berate me, I did try to use NSUserName(),
NSFullUserName() functions.

There seems to be a very subtle bug in these functions.

No, there isn't a bug. Your expectation is wrong; given that many people can be logged in to a machine simultaneously, and given that they are executing as the "root" user, it wouldn't make sense for these functions to return anything else.

So I need to someway get the name of the person logged in, in a Startup Item
so I can setup the last preferences for the app and driver I am writing.

There are three *big* problems here:

1. There might not be anyone logged in.

2. There might be multiple users logged in (i.e. several Finder processes running as different users/groups).

3. Panther's fast user switching feature means that the user that owns the main display can change at the click of a button. This may well cause you complications.

What is your driver for? You need to think carefully about which user should own your device and therefore under what circumstances you should apply their preferences. For example, a driver for a removable media device should probably respect the preferences of whoever mounted it, whereas a driver for an input device should respect the preferences of the user that currently owns the main display.

Kind regards,

Alastair.
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