1 // Copyright 2018 Developers of the Rand project.
2 //
3 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
4 // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
5 // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
6 // option. This file may not be copied, modified, or distributed
7 // except according to those terms.
8
9 //! Implementation for FreeBSD and NetBSD
10 use crate::util_libc::sys_fill_exact;
11 use crate::Error;
12 use core::ptr;
13
kern_arnd(buf: &mut [u8]) -> libc::ssize_t14 fn kern_arnd(buf: &mut [u8]) -> libc::ssize_t {
15 static MIB: [libc::c_int; 2] = [libc::CTL_KERN, libc::KERN_ARND];
16 let mut len = buf.len();
17 let ret = unsafe {
18 libc::sysctl(
19 MIB.as_ptr(),
20 MIB.len() as libc::c_uint,
21 buf.as_mut_ptr() as *mut _,
22 &mut len,
23 ptr::null(),
24 0,
25 )
26 };
27 if ret == -1 {
28 error!("sysctl kern.arandom: syscall failed");
29 -1
30 } else {
31 len as libc::ssize_t
32 }
33 }
34
getrandom_inner(dest: &mut [u8]) -> Result<(), Error>35 pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
36 #[cfg(target_os = "freebsd")]
37 {
38 use crate::util_libc::Weak;
39 static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
40 type GetRandomFn =
41 unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;
42
43 if let Some(fptr) = GETRANDOM.ptr() {
44 let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
45 return sys_fill_exact(dest, |buf| unsafe { func(buf.as_mut_ptr(), buf.len(), 0) });
46 }
47 }
48 sys_fill_exact(dest, kern_arnd)
49 }
50