man > proc_tid_children(5)

proc_tid_children(5)                     File Formats Manual                    proc_tid_children(5)

NAME
       /proc/tid/children - child tasks

DESCRIPTION
       /proc/tid/children (since Linux 3.5)
              A space-separated list of child tasks of this 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 of the child processes are stopped or  frozen.
              It  does not work properly if children of the target task exit while the file is being
              read!  Exiting children may cause non-exiting children to be omitted  from  the  list.
              This  makes  this  interface even more unreliable than classic PID-based approaches if
              the inspected task and its children aren't frozen, and most code should  probably  not
              use this interface.

              Until  Linux  4.2, the presence of this file was governed by the CONFIG_CHECKPOINT_RE‐
              STORE kernel configuration option.  Since Linux  4.2,  it  is  governed  by  the  CON‐
              FIG_PROC_CHILDREN option.

SEE ALSO
       proc(5)

Linux man-pages 6.7                          2023-08-15                         proc_tid_children(5)