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// Copyright 2017-2018 DigitalOcean.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//+build linux
package smbios
import (
"io"
"os"
)
const (
// sysfs locations for SMBIOS information.
sysfsDMI = "/sys/firmware/dmi/tables/DMI"
sysfsEntryPoint = "/sys/firmware/dmi/tables/smbios_entry_point"
)
// stream opens the SMBIOS entry point and an SMBIOS structure stream.
func stream() (io.ReadCloser, EntryPoint, error) {
// First, check for the sysfs location present in modern kernels.
_, err := os.Stat(sysfsEntryPoint)
switch {
case err == nil:
return sysfsStream(sysfsEntryPoint, sysfsDMI)
case os.IsNotExist(err):
// Fall back to the standard UNIX-like system method.
return devMemStream()
default:
return nil, nil, err
}
}
// sysfsStream reads the SMBIOS entry point and structure stream from
// two files; usually the modern sysfs locations.
func sysfsStream(entryPoint, dmi string) (io.ReadCloser, EntryPoint, error) {
epf, err := os.Open(entryPoint)
if err != nil {
return nil, nil, err
}
defer epf.Close()
ep, err := ParseEntryPoint(epf)
if err != nil {
return nil, nil, err
}
sf, err := os.Open(dmi)
if err != nil {
return nil, nil, err
}
return sf, ep, nil
}
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