arandom_netbsd.go

     1  // Copyright 2023 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 unix
     6  
     7  import (
     8  	"syscall"
     9  	"unsafe"
    10  )
    11  
    12  const (
    13  	_CTL_KERN = 1
    14  
    15  	_KERN_ARND = 81
    16  )
    17  
    18  func Arandom(p []byte) error {
    19  	mib := [2]uint32{_CTL_KERN, _KERN_ARND}
    20  	n := uintptr(len(p))
    21  	_, _, errno := syscall.Syscall6(
    22  		syscall.SYS___SYSCTL,
    23  		uintptr(unsafe.Pointer(&mib[0])),
    24  		uintptr(len(mib)),
    25  		uintptr(unsafe.Pointer(&p[0])), // olddata
    26  		uintptr(unsafe.Pointer(&n)),    // &oldlen
    27  		uintptr(unsafe.Pointer(nil)),   // newdata
    28  		0)                              // newlen
    29  	if errno != 0 {
    30  		return syscall.Errno(errno)
    31  	}
    32  	if n != uintptr(len(p)) {
    33  		return syscall.EINVAL
    34  	}
    35  	return nil
    36  }
    37
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