crates/getrandom/src/macos.rs

//! Implementation for macOS
use crate::{util_libc::last_os_error, Error};
use core::mem::MaybeUninit;

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> {
    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(())
}