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// Copyright 2009 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 runtime
import (
"unsafe"
)
// Temporary for C code to call:
//go:linkname minit runtime.minit
// Called to initialize a new m (including the bootstrap m).
// Called on the parent thread (main thread in case of bootstrap), can allocate memory.
func mpreinit(mp *m) {
mp.gsignal = malg(true, true, &mp.gsignalstack, &mp.gsignalstacksize)
mp.gsignal.m = mp
}
// minit is called to initialize a new m (including the bootstrap m).
// Called on the new thread, cannot allocate memory.
func minit() {
// Initialize signal handling.
_g_ := getg()
var st _stack_t
sigaltstack(nil, &st)
if st.ss_flags&_SS_DISABLE != 0 {
signalstack(_g_.m.gsignalstack, _g_.m.gsignalstacksize)
_g_.m.newSigstack = true
} else {
_g_.m.newSigstack = false
}
// FIXME: We should set _g_.m.procid here.
// restore signal mask from m.sigmask and unblock essential signals
nmask := _g_.m.sigmask
for i := range sigtable {
if sigtable[i].flags&_SigUnblock != 0 {
sigdelset(&nmask, int32(i))
}
}
sigprocmask(_SIG_SETMASK, &nmask, nil)
}
// Called from dropm to undo the effect of an minit.
//go:nosplit
func unminit() {
if getg().m.newSigstack {
signalstack(nil, 0)
}
}
var urandom_dev = []byte("/dev/urandom\x00")
func getRandomData(r []byte) {
if startupRandomData != nil {
n := copy(r, startupRandomData)
extendRandom(r, n)
return
}
fd := open(&urandom_dev[0], 0 /* O_RDONLY */, 0)
n := read(fd, unsafe.Pointer(&r[0]), int32(len(r)))
closefd(fd)
extendRandom(r, int(n))
}
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