man:ai:753ba
explain the copy_from_user function from the linux kernel. In which contexts is it allowed to be called? is it preemptable?
$ man copy_from_user
try on your machine
The copy_from_user function is used in the Linux kernel to safely copy data from user space to kernel space. It is allowed to be called in kernel contexts such as system calls and interrupt handlers. However, it is not preemptable as it directly accesses user space memory and must be executed atomically.
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Questions that are answered by this command:
- explain the copy_from_user function from the linux kernel. In which contexts is it allowed to be called? is it preemptable?