libgo/go/runtime/os_gccgo.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package runtime
   6
   7 import (
   8         "unsafe"
   9 )
  10
  11 // For C code to call:
  12 //go:linkname minit runtime.minit
  13
  14 func goenvs() {
  15         goenvs_unix()
  16 }
  17
  18 // Called to initialize a new m (including the bootstrap m).
  19 // Called on the parent thread (main thread in case of bootstrap), can allocate memory.
  20 func mpreinit(mp *m) {
  21         mp.gsignal = malg(true, true, &mp.gsignalstack, &mp.gsignalstacksize)
  22         mp.gsignal.m = mp
  23 }
  24
  25 // minit is called to initialize a new m (including the bootstrap m).
  26 // Called on the new thread, cannot allocate memory.
  27 func minit() {
  28         minitSignals()
  29
  30         // FIXME: We should set _g_.m.procid here.
  31 }
  32
  33 // Called from dropm to undo the effect of an minit.
  34 //go:nosplit
  35 //go:nowritebarrierrec
  36 func unminit() {
  37         unminitSignals()
  38 }
  39
  40 var urandom_dev = []byte("/dev/urandom\x00")
  41
  42 func getRandomData(r []byte) {
  43         if startupRandomData != nil {
  44                 n := copy(r, startupRandomData)
  45                 extendRandom(r, n)
  46                 return
  47         }
  48         fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
  49         n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
  50         closefd(fd)
  51         extendRandom(r, int(n))
  52 }