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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"
)
// For C code to call:
//go:linkname minit
func goenvs() {
goenvs_unix()
}
// 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() {
minitSignals()
// FIXME: only works on linux for now.
getg().m.procid = uint64(gettid())
}
// Called from dropm to undo the effect of an minit.
//go:nosplit
//go:nowritebarrierrec
func unminit() {
unminitSignals()
}
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))
}
//go:noescape
//extern pipe
func libcPipe(*[2]int32) int32
func pipe() (r, w int32, e int32) {
var p [2]int32
res := libcPipe(&p)
if res < 0 {
e = int32(errno())
}
return p[0], p[1], e
}
//go:noescape
//extern pipe2
func libcPipe2(*[2]int32, int32) int32
func pipe2(flags int32) (r, w int32, e int32) {
var p [2]int32
res := libcPipe2(&p, flags)
if res < 0 {
e = int32(errno())
}
return p[0], p[1], e
}
//extern __go_fcntl_uintptr
func fcntlUintptr(fd, cmd, arg uintptr) (uintptr, uintptr)
//go:nosplit
func closeonexec(fd int32) {
fcntlUintptr(uintptr(fd), _F_SETFD, _FD_CLOEXEC)
}
//go:nosplit
func setNonblock(fd int32) {
flags, errno := fcntlUintptr(uintptr(fd), _F_GETFL, 0)
if errno == 0 {
fcntlUintptr(uintptr(fd), _F_SETFL, flags|_O_NONBLOCK)
}
}
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