39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
/*
|
|
Copyright The containerd 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.
|
|
*/
|
|
|
|
package seed
|
|
|
|
import (
|
|
"math/rand"
|
|
"time"
|
|
)
|
|
|
|
// WithTimeAndRand seeds the global math rand generator with nanoseconds
|
|
// XOR'ed with a crypto component if available for uniqueness.
|
|
func WithTimeAndRand() {
|
|
var (
|
|
b [4]byte
|
|
u int64
|
|
)
|
|
|
|
tryReadRandom(b[:])
|
|
|
|
// Set higher 32 bits, bottom 32 will be set with nanos
|
|
u |= (int64(b[0]) << 56) | (int64(b[1]) << 48) | (int64(b[2]) << 40) | (int64(b[3]) << 32)
|
|
|
|
rand.Seed(u ^ time.Now().UnixNano())
|
|
}
|