Determine user privileges?

[ensis2k]

Is there a way to tell from within C if the user who executed the app is a super user? Or to be more specific: Does my application has access to system functions like "mlockall".

I do not want to realize in the middle of my app that necessary functions do not work properly because of that. So at startup I want to specifically check if the app is allowed to do so and return a proper error message if not.

Thanks in advance.

[dwhitney67]

Try getuid(). If the value returned is 0, then you have superuser privileges; otherwise you do not.


#include <unistd.h>
#include <stdio.h>

int main()
{
printf( "uid = %d\n", getuid() );
return 0;
}

[ensis2k]

Thank you. It works now.
:guitar: