GUIDINGLI commented on pull request #4811:
URL: https://github.com/apache/incubator-nuttx/pull/4811#issuecomment-964761577
In the struct task_group_s the tg_pid & tgppid is always exist, so the
`cmd_ps` don't need to depends on CONFIG_SCHED_HAVE_PARENT.
And the cmd_ps actually want show one thread belong to witch group, so
`tg_pid` is enough.
If you want to know the `tg_ppid`, you can cat /proc/xx/group/status to get
the result.
```
struct task_group_s
{
#if defined(HAVE_GROUP_MEMBERS) || defined(CONFIG_ARCH_ADDRENV)
struct task_group_s *flink; /* Supports a singly linked list
*/
#endif
pid_t tg_pid; /* The ID of the task within the group
*/
pid_t tg_ppid; /* This is the ID of the parent thread
*/
uint8_t tg_flags; /* See GROUP_FLAG_* definitions
*/
}
```
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