David McCullough wrote:
Jivin Muthu, Pushparaj IN GGN SISL lays it down ...
Question related to uClinux has user space and kernel spaceser space .
My question is
In uClinux when user space calls system call , it invokes software interrupt
and enter into kernel space serve the routine and come back to user space like
destop linux. or user call like wrapper function over the kernel call.
Usually it's done using a trap/software interrupt just as in the MMU
version. No difference. That's not to say that you couldn't do
something else, just that no one has to my knowledge.
In a sense it's both - it is a SW trap/interrupt into the kernel at a
fixed entry point, but also the C libraries tend to wrap around the raw
system calls as well, morphing return codes into errno and so on.
John
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