Re: [PATCH bpf-next v2 8/9] libbpf: add support for the multi-link of tracing

On Mon, Mar 11, 2024 at 2:35 AM Menglong Dong dongmenglong.8@bytedance.com wrote:

•           err = libbpf_find_attach_btf_id(prog, attach_name, &btf_obj_fd, &btf_type_id);
  

•           name_end = strchr(attach_name, ',');
  

•           /* for multi-link tracing, use the first target symbol during
  

•            * loading.
  

•            */
  

•           if ((def & SEC_ATTACH_BTF_MULTI) && name_end) {
  

•                   int len = name_end - attach_name + 1;
  

•                   char *first_tgt;
  

•                   first_tgt = malloc(len);
  

•                   if (!first_tgt)
  

•                           return -ENOMEM;
  

•                   strncpy(first_tgt, attach_name, len);
  

•                   first_tgt[len - 1] = '\0';
  

•                   err = libbpf_find_attach_btf_id(prog, first_tgt, &btf_obj_fd,
  

•                                                   &btf_type_id);
  

•                   free(first_tgt);
  

•           } else {
  

•                   err = libbpf_find_attach_btf_id(prog, attach_name, &btf_obj_fd,
  

•                                                   &btf_type_id);
  

•           }
  

Pls use glob_match the way [ku]probe multi are doing instead of exact match.