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libbpf: Deprecate bpf_objects_list

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Add a flag to `enum libbpf_strict_mode' to disable the global
`bpf_objects_list', preventing race conditions when concurrent threads
call bpf_object__open() or bpf_object__close().

bpf_object__next() will return NULL if this option is set.

Callers may achieve the same workflow by tracking bpf_objects in
application code.

  [0] Closes: https://github.com/libbpf/libbpf/issues/293

Signed-off-by: Joe Burton <jevburton@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211026223528.413950-1-jevburton.kernel@gmail.com
This commit is contained in:
Joe Burton
2021-10-26 22:35:28 +00:00
committed by Andrii Nakryiko
parent 87a9622982
commit 50041f432d
3 changed files with 15 additions and 2 deletions
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6
src/libbpf_legacy.h
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@@ -57,6 +57,12 @@ enum libbpf_strict_mode {
* function name instead of section name.
*/
LIBBPF_STRICT_SEC_NAME = 0x04,
/*
* Disable the global 'bpf_objects_list'. Maintaining this list adds
* a race condition to bpf_object__open() and bpf_object__close().
* Clients can maintain it on their own if it is valuable for them.
*/
LIBBPF_STRICT_NO_OBJECT_LIST = 0x08,
__LIBBPF_STRICT_LAST,
};