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-rw-r--r--third_party/rust/getrandom/src/macos.rs40
1 files changed, 11 insertions, 29 deletions
diff --git a/third_party/rust/getrandom/src/macos.rs b/third_party/rust/getrandom/src/macos.rs
index 312f9b27f0..44af76b03c 100644
--- a/third_party/rust/getrandom/src/macos.rs
+++ b/third_party/rust/getrandom/src/macos.rs
@@ -1,36 +1,18 @@
-// Copyright 2019 Developers of the Rand project.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
//! Implementation for macOS
-use crate::{
- use_file,
- util_libc::{last_os_error, Weak},
- Error,
-};
-use core::mem::{self, MaybeUninit};
+use crate::{util_libc::last_os_error, Error};
+use core::mem::MaybeUninit;
-type GetEntropyFn = unsafe extern "C" fn(*mut u8, libc::size_t) -> libc::c_int;
+extern "C" {
+ // Supported as of macOS 10.12+.
+ fn getentropy(buf: *mut u8, size: libc::size_t) -> libc::c_int;
+}
pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
- // getentropy(2) was added in 10.12, Rust supports 10.7+
- static GETENTROPY: Weak = unsafe { Weak::new("getentropy\0") };
- if let Some(fptr) = GETENTROPY.ptr() {
- let func: GetEntropyFn = unsafe { mem::transmute(fptr) };
- for chunk in dest.chunks_mut(256) {
- let ret = unsafe { func(chunk.as_mut_ptr() as *mut u8, chunk.len()) };
- if ret != 0 {
- return Err(last_os_error());
- }
+ for chunk in dest.chunks_mut(256) {
+ let ret = unsafe { getentropy(chunk.as_mut_ptr() as *mut u8, chunk.len()) };
+ if ret != 0 {
+ return Err(last_os_error());
}
- Ok(())
- } else {
- // We fallback to reading from /dev/random instead of SecRandomCopyBytes
- // to avoid high startup costs and linking the Security framework.
- use_file::getrandom_inner(dest)
}
+ Ok(())
}