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Re: system command returning unknown error.


On Jun 14, 2006, at 12:48 PM, "matt jaffa" <email@hidden> wrote:

Yes I am running as a root process.

On 6/14/06, John Francini <email@hidden> wrote: 

/sbin/shutdown must be run by root. Running as a user with
Administrator privilege is not sufficient.

Is the parent process running as root or setuid to root?

John


On 14 Jun 2006, at 15:15, matt jaffa wrote:

Ok so I admit I read it wrong regarding the return status, always got
0 for everything else I executed so I assumed 0 good and only -1 was
returned if bad.

soo I am getting 32256 by executing    system("/sbin/shutdown -r
now");


Matt,

It's a very good thing that you are getting this error.

You should not be calling system(3), and most especially you should not be calling it from a process running as root.

Please consult your copy of "Advanced Programming in the Unix Environment" by W. Richard Stevens, and see his
straightforward examples on the correct usage of fork(2) and execv (2), which will do what you want just fine.

Incidentally, unless you are shutting the system down in an emergency, invoking shutdown(8) may not be the correct way to bring the system down. It's definitely not polite to any currently-logged- in console user.

 = Mike

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