283d9f7483
pin dependency github.com/beorn7/perks from v1.0.0 to v1.0.1 pin dependency github.com/golang/protobuf from v1.3.3 to v1.4.2 pin denpendency github.com/json-iterator/go from v1.1.8 to v1.1.9 pin dependency github.com/prometheus/common from v0.4.1 to v0.9.1 pin dependency github.com/prometheus/procfs from v0.0.5 to v0.0.11 pin dependency github.com/alecthomas/template from v0.0.0-20160405071501-a0175ee3bccc to v0.0.0-20190718012654-fb15b899a751 pin dependency github.com/alecthomas/units from v0.0.0-20151022065526-2efee857e7cf to v0.0.0-20190717042225-c3de453c63f4 pin dependency github.com/go-kit/kit from v0.8.0 to v0.9.0 pin dependency github.com/go-logfmt/logfmt from v0.3.0 to v0.4.0 Co-Authored-By: Jordan Liggitt <jordan@liggitt.net>
49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
// Copyright 2018 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build linux,!appengine
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package util
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import (
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"bytes"
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"os"
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"syscall"
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)
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// SysReadFile is a simplified ioutil.ReadFile that invokes syscall.Read directly.
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// https://github.com/prometheus/node_exporter/pull/728/files
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//
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// Note that this function will not read files larger than 128 bytes.
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func SysReadFile(file string) (string, error) {
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f, err := os.Open(file)
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if err != nil {
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return "", err
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}
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defer f.Close()
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// On some machines, hwmon drivers are broken and return EAGAIN. This causes
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// Go's ioutil.ReadFile implementation to poll forever.
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//
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// Since we either want to read data or bail immediately, do the simplest
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// possible read using syscall directly.
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const sysFileBufferSize = 128
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b := make([]byte, sysFileBufferSize)
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n, err := syscall.Read(int(f.Fd()), b)
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if err != nil {
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return "", err
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}
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return string(bytes.TrimSpace(b[:n])), nil
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}
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