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 // Temporary for C code to call:
  12 //go:linkname minit runtime.minit
  13
  14 // Called to initialize a new m (including the bootstrap m).
  15 // Called on the parent thread (main thread in case of bootstrap), can allocate memory.
  16 func mpreinit(mp *m) {
  17         mp.gsignal = malg(true, true, &mp.gsignalstack, &mp.gsignalstacksize)
  18         mp.gsignal.m = mp
  19 }
  20
  21 // minit is called to initialize a new m (including the bootstrap m).
  22 // Called on the new thread, cannot allocate memory.
  23 func minit() {
  24         minitSignals()
  25
  26         // FIXME: We should set _g_.m.procid here.
  27 }
  28
  29 // Called from dropm to undo the effect of an minit.
  30 //go:nosplit
  31 func unminit() {
  32         unminitSignals()
  33 }
  34
  35 var urandom_dev = []byte("/dev/urandom\x00")
  36
  37 func getRandomData(r []byte) {
  38         if startupRandomData != nil {
  39                 n := copy(r, startupRandomData)
  40                 extendRandom(r, n)
  41                 return
  42         }
  43         fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
  44         n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
  45         closefd(fd)
  46         extendRandom(r, int(n))
  47 }