blob: da3a941d60b90b9c094aa571aaaf74b906b462ed [file] [log] [blame]
khenaidoo26721882021-08-11 17:42:52 -04001// Copyright 2020 The Prometheus Authors
2// Licensed under the Apache License, Version 2.0 (the "License");
3// you may not use this file except in compliance with the License.
4// You may obtain a copy of the License at
5//
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13
14// +build !windows
15
16package procfs
17
18import (
19 "os"
20
21 "github.com/prometheus/procfs/internal/util"
22)
23
24// KernelRandom contains information about to the kernel's random number generator.
25type KernelRandom struct {
26 // EntropyAvaliable gives the available entropy, in bits.
27 EntropyAvaliable *uint64
28 // PoolSize gives the size of the entropy pool, in bits.
29 PoolSize *uint64
30 // URandomMinReseedSeconds is the number of seconds after which the DRNG will be reseeded.
31 URandomMinReseedSeconds *uint64
32 // WriteWakeupThreshold the number of bits of entropy below which we wake up processes
33 // that do a select(2) or poll(2) for write access to /dev/random.
34 WriteWakeupThreshold *uint64
35 // ReadWakeupThreshold is the number of bits of entropy required for waking up processes that sleep
36 // waiting for entropy from /dev/random.
37 ReadWakeupThreshold *uint64
38}
39
40// KernelRandom returns values from /proc/sys/kernel/random.
41func (fs FS) KernelRandom() (KernelRandom, error) {
42 random := KernelRandom{}
43
44 for file, p := range map[string]**uint64{
45 "entropy_avail": &random.EntropyAvaliable,
46 "poolsize": &random.PoolSize,
47 "urandom_min_reseed_secs": &random.URandomMinReseedSeconds,
48 "write_wakeup_threshold": &random.WriteWakeupThreshold,
49 "read_wakeup_threshold": &random.ReadWakeupThreshold,
50 } {
51 val, err := util.ReadUintFromFile(fs.proc.Path("sys", "kernel", "random", file))
52 if os.IsNotExist(err) {
53 continue
54 }
55 if err != nil {
56 return random, err
57 }
58 *p = &val
59 }
60
61 return random, nil
62}