PIDFD_NS_IPC
if (self->nsfds[PIDFD_NS_IPC] >= 0 && unshare(CLONE_NEWIPC) < 0) {
if (self->nsfds[PIDFD_NS_IPC] >= 0 && unshare(CLONE_NEWIPC) < 0) {
[PIDFD_NS_IPC] = { "ipc", CLONE_NEWIPC, PIDFD_GET_IPC_NAMESPACE, },