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Source file src/crypto/rand/rand_linux.go

Documentation: crypto/rand

  // Copyright 2014 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  package rand
  import (
  func init() {
  	altGetRandom = getRandomLinux
  // If the kernel is too old (before 3.17) to support the getrandom syscall(),
  // unix.GetRandom will immediately return ENOSYS and we will then fall back to
  // reading from /dev/urandom in rand_unix.go. unix.GetRandom caches the ENOSYS
  // result so we only suffer the syscall overhead once in this case.
  // If the kernel supports the getrandom() syscall, unix.GetRandom will block
  // until the kernel has sufficient randomness (as we don't use GRND_NONBLOCK).
  // In this case, unix.GetRandom will not return an error.
  func getRandomLinux(p []byte) (ok bool) {
  	n, err := unix.GetRandom(p, 0)
  	return n == len(p) && err == nil

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