#unconditional
CLONE_VM
CLONE_FS
CLONE_FILES
CLONE_SIGHAND
CLONE_PIDFD
CLONE_PTRACE
CLONE_VFORK
CLONE_PARENT
CLONE_THREAD
CLONE_NEWNS
CLONE_SYSVSEM
CLONE_SETTLS
CLONE_PARENT_SETTID
CLONE_CHILD_CLEARTID
/* CLONE_DETACHED ignored by kernel */
CLONE_UNTRACED
CLONE_CHILD_SETTID
CLONE_NEWCGROUP
CLONE_NEWUTS
CLONE_NEWIPC
CLONE_NEWUSER
CLONE_NEWPID
CLONE_NEWNET
CLONE_IO