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// Copyright 2020 The Prometheus Authors
// 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 !windows
package procfs
import (
"os"
"github.com/prometheus/procfs/internal/util"
)
// KernelRandom contains information about to the kernel's random number generator.
type KernelRandom struct {
// EntropyAvaliable gives the available entropy, in bits.
EntropyAvaliable *uint64
// PoolSize gives the size of the entropy pool, in bits.
PoolSize *uint64
// URandomMinReseedSeconds is the number of seconds after which the DRNG will be reseeded.
URandomMinReseedSeconds *uint64
// WriteWakeupThreshold the number of bits of entropy below which we wake up processes
// that do a select(2) or poll(2) for write access to /dev/random.
WriteWakeupThreshold *uint64
// ReadWakeupThreshold is the number of bits of entropy required for waking up processes that sleep
// waiting for entropy from /dev/random.
ReadWakeupThreshold *uint64
}
// KernelRandom returns values from /proc/sys/kernel/random.
func (fs FS) KernelRandom() (KernelRandom, error) {
random := KernelRandom{}
for file, p := range map[string]**uint64{
"entropy_avail": &random.EntropyAvaliable,
"poolsize": &random.PoolSize,
"urandom_min_reseed_secs": &random.URandomMinReseedSeconds,
"write_wakeup_threshold": &random.WriteWakeupThreshold,
"read_wakeup_threshold": &random.ReadWakeupThreshold,
} {
val, err := util.ReadUintFromFile(fs.proc.Path("sys", "kernel", "random", file))
if os.IsNotExist(err) {
continue
}
if err != nil {
return random, err
}
*p = &val
}
return random, nil
}
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