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Remove #cfg from bsd_arandom.rs #332

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merged 1 commit into from Jan 26, 2023
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27 changes: 13 additions & 14 deletions src/bsd_arandom.rs
Expand Up @@ -7,7 +7,10 @@
// except according to those terms.

//! Implementation for FreeBSD and NetBSD
use crate::{util_libc::sys_fill_exact, Error};
use crate::{
util_libc::{sys_fill_exact, Weak},
Error,
};
use core::{mem::MaybeUninit, ptr};

fn kern_arnd(buf: &mut [MaybeUninit<u8>]) -> libc::ssize_t {
Expand All @@ -30,22 +33,18 @@ fn kern_arnd(buf: &mut [MaybeUninit<u8>]) -> libc::ssize_t {
}
}

type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;

pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
// getrandom(2) was introduced in FreeBSD 12.0 and NetBSD 10.0
#[cfg(any(target_os = "freebsd", target_os = "netbsd"))]
{
use crate::util_libc::Weak;
static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
type GetRandomFn =
unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;

if let Some(fptr) = GETRANDOM.ptr() {
let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
return sys_fill_exact(dest, |buf| unsafe {
func(buf.as_mut_ptr() as *mut u8, buf.len(), 0)
});
}
static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
if let Some(fptr) = GETRANDOM.ptr() {
let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
return sys_fill_exact(dest, |buf| unsafe {
func(buf.as_mut_ptr() as *mut u8, buf.len(), 0)
});
}

// Both FreeBSD and NetBSD will only return up to 256 bytes at a time, and
// older NetBSD kernels will fail on longer buffers.
for chunk in dest.chunks_mut(256) {
Expand Down