Add AttachIter to wrap bpf_program__attach_iter

[mozillazg]

#91

[mozillazg]

Error: ./libbpfgo.go:133:27: error: variable has incomplete type 'union bpf_iter_link_info'
union bpf_iter_link_info linfo;

@geyslan @grantseltzer I have no idea how to fix this error. Could you help me? Thanks!

BTW, The selftests can be run successfully on my vagrant host.

[grantseltzer]

I'm taking a look now! @mozillazg

[geyslan]

@mozillazg thank you for your contribution 🙇🏼‍♂️. I reviewed the C part so far.

Regarding the check error, we'll take a look soon, but if you are able to do some tests, try seeing if the header that declares bpf_iter_link_info is being included correctly (uapi/linux/bpf.h): https://github.com/libbpf/libbpf/blob/1714037104da56308ddb539ae0a362a9936121ff/include/uapi/linux/bpf.h#L98-L113

Error: ./libbpfgo.go:132:27: error: variable has incomplete type 'union bpf_iter_link_info'
        union bpf_iter_link_info linfo;
                                 ^
./output/bpf/bpf.h:303:7: note: forward declaration of 'union bpf_iter_link_info'
union bpf_iter_link_info; /* defined in up-to-date linux/bpf.h */
      ^
1 error generated.

[geyslan]

BTW, The selftests can be run successfully on my vagrant host.

@mozillazg for your vagrant host do you mean the one provided by libbpfgo?

-- EDIT

We've just updated the main branch bumping versions. Could you please rebase this PR on top of it? Let's keep an eye in the check results again. Thanks.

[mozillazg]

We've just updated the main branch bumping versions. Could you please rebase this PR on top of it? Let's keep an eye in the check results again. Thanks.

@geyslan

After merging the main branch all checks have passed.

[grantseltzer]

My apologies for the delay in getting to review this properly, will have good feedback for you by end of week!

[geyslan]

Overall it LGTM, just some handling over version control and API is required.

[rafaeldtinoco]

@mozillazg I'm sorry this was left unattended. Is this still valid ? I'm converting to DRAFT just so you can rebase (and squash so many commits into meaningful ones) so we can review/merge it. Thank you!

Post Edit. I saw that @geyslan is giving attention and asked changes recently. So, either way, feel free to remove draft once this is ready.

[mozillazg]

Ready for review.

[geyslan]

LGTM

[geyslan]

@mozillazg Thank you so much for always contributing.