Function LoadPinnedMap

map.go:1731–1751

LoadPinnedMap opens a Map from a pin (file) on the BPF virtual filesystem. Requires at least Linux 4.5.

(fileName string, opts *LoadPinOptions)

//
// Requires at least Linux 4.5.
func LoadPinnedMap(fileName string, opts *LoadPinOptions) (*Map, error) {
	fd, typ, err := sys.ObjGetTyped(&sys.ObjGetAttr{
		Pathname:  sys.NewStringPointer(fileName),
		FileFlags: opts.Marshal(),
	})
	if err != nil {
		return nil, err
	}

	if typ != sys.BPF_TYPE_MAP {
		_ = fd.Close()
		return nil, fmt.Errorf("%s is not a Map", fileName)
	}

	m, err := newMapFromFD(fd)
	if err == nil {
		m.pinnedPath = fileName
	}

	return m, err
}

// unmarshalMap creates a map from a map ID encoded in host endianness.
func unmarshalMap(buf sysenc.Buffer) (*Map, error) {