mirror of
https://github.com/saymrwulf/xous-core.git
synced 2026-11-12 07:44:18 +00:00
e2026318b6
we have to keep all the targets around, because hosted mode also uses rand, which won't resolve correctly unless we also have the host's target available, unfortunately (trust me, tried to do a version stripped down just for xous...)
36 lines
1.3 KiB
Rust
36 lines
1.3 KiB
Rust
// Copyright 2019 Developers of the Rand project.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Implementation for macOS
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use crate::{
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use_file,
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util_libc::{last_os_error, Weak},
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Error,
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};
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use core::mem;
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type GetEntropyFn = unsafe extern "C" fn(*mut u8, libc::size_t) -> libc::c_int;
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pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
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// getentropy(2) was added in 10.12, Rust supports 10.7+
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static GETENTROPY: Weak = unsafe { Weak::new("getentropy\0") };
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if let Some(fptr) = GETENTROPY.ptr() {
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let func: GetEntropyFn = unsafe { mem::transmute(fptr) };
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for chunk in dest.chunks_mut(256) {
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let ret = unsafe { func(chunk.as_mut_ptr(), chunk.len()) };
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if ret != 0 {
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return Err(last_os_error());
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}
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}
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Ok(())
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} else {
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// We fallback to reading from /dev/random instead of SecRandomCopyBytes
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// to avoid high startup costs and linking the Security framework.
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use_file::getrandom_inner(dest)
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}
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}
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