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fix: GetMap() comment #371

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merged 1 commit into from
Aug 29, 2023
Merged

fix: GetMap() comment #371

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9 changes: 3 additions & 6 deletions libbpfgo.go
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Expand Up @@ -418,12 +418,9 @@ func (m *Module) GetMap(mapName string) (*BPFMap, error) {
fd := bpfMap.FileDescriptor()
info, err := GetMapInfoByFD(fd)
if err != nil {
// Compatibility Note: Some older kernels lack BTF (BPF Type Format)
// support for specific BPF map types. In such scenarios, libbpf may
// fail (EPERM) when attempting to retrieve information for these maps.
// Reference: https://elixir.bootlin.com/linux/v5.15.75/source/tools/lib/bpf/gen_loader.c#L401
//
// However, we can still get some map info from the BPF map high level API.
// The consumer of this API may not have sufficient privileges to get
// map info via BPF syscall. However, "some" map info still can be
// retrieved from the BPF object itself.
bpfMap.bpfMapLow = &BPFMapLow{
fd: fd,
info: &BPFMapInfo{
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