...s task. Each child task is represented by its TID. This option is intended for use by the checkpoint-restore (CRIU) system, and reliably provides a list of children only if all …...SCREDS check; see ptrace (2). Until Linux 4.3, this directory appeared only if the CONFIG_CHECKPOINT_RESTORE kernel configuration option was enabled. Capabilities are required t…...-2 in this field. This file is available only when the kernel was configured with CONFIG_CHECKPOINT_RESTORE . SEE ALSO proc (5)