[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/kernel_random.go b/vendor/github.com/prometheus/procfs/kernel_random.go
new file mode 100644
index 0000000..da3a941
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/kernel_random.go
@@ -0,0 +1,62 @@
+// 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
+}