Re: [PATCH v2 bpf-next 16/17] libbpf: Add support for attaching BPF programs to other BPF programs

[Alexei Starovoitov <ast@xxxxxx>]

On 11/6/19 9:46 PM, Alexei Starovoitov wrote:
> @@ -3924,6 +3965,14 @@ __bpf_object__open(const char *path, const void *obj_buf, size_t obj_buf_sz,
>   		bpf_program__set_type(prog, prog_type);
>   		bpf_program__set_expected_attach_type(prog, attach_type);
>   		if (prog_type == BPF_PROG_TYPE_TRACING) {
> +			if (attach_prog_fd) {
> +				err = libbpf_get_prog_btf_id(attach_prog_fd, prog->section_name + 6);
> +				if (err > 0) {
> +					btf_id = err;
> +					err = 0;
> +					prog->attach_prog_fd = attach_prog_fd;
> +				}
> +			} else
>   			err = libbpf_attach_btf_id_by_name(prog->section_name,

forgot to squash small cleanup here last night.
pls ignore this particular patch.