question : is the init process of kernel running in kernel space or user space?

Hi all, In the linux system , kernel is often starting up like this : bootloader -> start_32() -> start_kernel() -> init() i would like to ask what is the piority level in this starting procedure ? 0 or 3 ? that means, this start up process are running in kernel space or user space ? or the leve

question about returning of a child process

Hi all, What is the first code the new born child process run after it is forked by the system call and being schduled into the CPU to run ? what i concerned is , kernel will schdule once when leaving the system call for returning father process, will kernel schdule once again when leaving the

Re: Why system call need to copy the date from the userspace before using it

Catalin Marinas wrote: Tomko <[EMAIL PROTECTED]> wrote: Inside the system call , the kernel often copy the data by calling copy_from_user() rather than just using strcpy(), is it because the memory mapping in kenel space is different from user space? No, it is because this function

Re: Why system call need to copy the date from the userspace before using it

pass a pointer *a to kernel space , is it true that *a seems means address 0xb000 to user space but actually it is at 0xc000 at kernel space? Thx a lot, TOM Jan-Benedict Glaw wrote: On Wed, 2005-04-13 12:21:41 +0800, Tomko <[EMAIL PROTECTED]> wrote in message <[EMAIL PROTECTED]>:

Why system call need to copy the date from the userspace before using it

Hi all, I am new to linux , hope someone can help me. While i am reading the source code of the linux system call , i find that the system call need to call copy_from_user() to copy the data from user space to kernel space before using it . Why not use it directly as the system call has got the

question about execve()

Hi, I would like to ask when a userprogram called in user space called execve("/bin/abc" will this system call finally copy the code of /bin/abc into kernel space before kernel runs it or just leave the code in the userspace and run directly ? If the system really copy the program into