c - Call do_fork inside kernel -


for experimental purposes need create child kernel process without shared memory. know, kthread_create , kernel_thread routines call do_fork clone_vm. need call do_fork without clone_vm

i have found in arch/x86_64/kernel/process.c(x86_64 suitable architecture experiment):

asmlinkage long sys_fork(struct pt_regs *regs) {         return do_fork(sigchld, regs->rsp, regs, 0, null, null); }

i think, should call do_fork(sigchld, regs->rsp, regs, 0, null, null). can't understand how setup pt_regs structure. want setup structure based on registers of current process. there function fill pt_regs based on current process? or maybe there different way how create process own memory inside kernel?

kernel's address space always shared between processes. clone_vm flag affects on user address space sharing.

so, if need kernel process, use kthread_create. thread, created functions, allowed use kernel address space.


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