to start with a SIGSTOP, do not set proc->ftn->status to PS_RUNNING in __runq_add_proc(). change vfork() set CLONE_VFORK. refs #266 refs #267 refs #372 support PTRACE_GETEVENTMSG. to store ptrace event, add 'unsigned long ptrace_eventmsg;' member in struct fork_tree_node. refs #273
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