golang getentropy_openbsd 代码
文件路径：/src/internal/syscall/unix/getentropy_openbsd.go
/ Copyright 2016 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 unix
import (
"syscall"
"unsafe"
)
/ getentropy(2)'s syscall number, from /usr/src/sys/kern/syscalls.master
const entropyTrap uintptr = 7
/ GetEntropy calls the OpenBSD getentropy system call.
func GetEntropy(p []byte) error {
_, _, errno := syscall.Syscall(entropyTrap,
uintptr(unsafe.Pointer(&p[0])),
uintptr(len(p)),
0)
if errno != 0 {
return errno
}
return nil
}