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KFunc bpf_task_get_cgroup1

v6.8

Acquires the associated cgroup of a task within a specific cgroup1 hierarchy.

Definition

The cgroup1 hierarchy is identified by its hierarchy ID.

Returns

On success, the cgroup is returen. On failure, NULL is returned.

struct cgroup *bpf_task_get_cgroup1(struct task_struct *task, int hierarchy_id)

Note

This kfunc returns a pointer to a refcounted object. The verifier will then ensure that the pointer to the object is eventually released using a release kfunc, or transferred to a map using a referenced kptr (by invoking bpf_kptr_xchg). If not, the verifier fails the loading of the BPF program until no lingering references remain in all possible explored states of the program.

Note

The pointer returned by the kfunc may be NULL. Hence, it forces the user to do a NULL check on the pointer returned from the kfunc before making use of it (dereferencing or passing to another helper).

Usage

Docs could be improved

This part of the docs is incomplete, contributions are very welcome

Program types

The following program types can make use of this kfunc:

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome