1 //! Implementation using getrandom(2).
2 //!
3 //! Available since:
4 //! - Linux Kernel 3.17, Glibc 2.25, Musl 1.1.20
5 //! - Android API level 23 (Marshmallow)
6 //! - NetBSD 10.0
7 //! - FreeBSD 12.0
8 //! - illumos since Dec 2018
9 //! - DragonFly 5.7
10 //! - Hurd Glibc 2.31
11 //! - shim-3ds since Feb 2022
12 //!
13 //! For these platforms, we always use the default pool and never set the
14 //! GRND_RANDOM flag to use the /dev/random pool. On Linux/Android/Hurd, using
15 //! GRND_RANDOM is not recommended. On NetBSD/FreeBSD/Dragonfly/3ds, it does
16 //! nothing. On illumos, the default pool is used to implement getentropy(2),
17 //! so we assume it is acceptable here.
18 use crate::{util_libc::sys_fill_exact, Error};
19 use core::mem::MaybeUninit;
20
getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error>21 pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
22 sys_fill_exact(dest, |buf| unsafe {
23 libc::getrandom(buf.as_mut_ptr() as *mut libc::c_void, buf.len(), 0)
24 })
25 }
26