[plug] Query related to kernel mode and UML

[Parag Nemade]

hello ,
          I want to know 
when i run a simple C program i am in kernel mode or
in user mode?
when system call is called in a C program in which
mode i am ?
Also what is User Mode Linux(UML). what is difference
between UML and Simple LINUX KERNEL?
When i modify kernel and add some functions in kernel
and boot it? my functions runs in kernel mode or user
mode?
Is there any connection of modification of kernel to
UML?
regards,
parag



	
		
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