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KFunc bpf_task_from_vpid

v6.13

Find a struct task_struct from its vpid.

Definition

Find a struct task_struct from its vpid by looking it up in the pid namespace of the current task.

Parameters

vpid: The vpid of the task being looked up.

Returns

A pointer to a task struct or NULL. If a task is returned, it must either be stored in a map, or released with bpf_task_release.

Signature

struct task_struct *bpf_task_from_vpid(s32 vpid)

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