fix(so): reuse pinned dkapture bpf objects correctly#97
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Signed-off-by: Wang Yu <[email protected]>
xu-lang
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Jul 21, 2026
| struct bpf_map_info info = {}; | ||
| u32 len = sizeof(info); | ||
| std::string map_pin_path(PIN_PATH "/map-"); | ||
| std::string map_pin_path(PIN_PATH "/"); |
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因为在bpf-manager.cpp:207中bpf_object__pin_maps(m_obj->obj, PIN_PATH);这个函数会调用 libbpf，把当前 BPF object 里的所有 maps pin 到 PIN_PATH 下。但是libbpf 默认会用 map 自己的名字作为最后一级文件名，而没有map-这个前缀。以map-dk_shared_mem 这个map为例， 会导致
- 存在性判断永远看错地方，代码以为 /sys/fs/bpf/dkapture/map-dk_shared_mem 不存在，于是误判“需要新建”。
- 实际创建时又去创建真正的 dk_shared_mem， 但这个真实 pin 已经存在，于是 libbpf 报： failed to pin map: File exists
- 并且当前仓库里没有把 map pin 成 map-xxx 的定义
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