| extern crate libc; |
| |
| use rand_core::{Error, ErrorKind}; |
| use super::OsRngImpl; |
| |
| use std::ptr; |
| use std::io; |
| |
| #[derive(Clone, Debug)] |
| pub struct OsRng; |
| |
| impl OsRngImpl for OsRng { |
| fn new() -> Result<OsRng, Error> { Ok(OsRng) } |
| |
| fn fill_chunk(&mut self, dest: &mut [u8]) -> Result<(), Error> { |
| let mib = [libc::CTL_KERN, libc::KERN_ARND]; |
| let mut len = dest.len(); |
| let ret = unsafe { |
| libc::sysctl(mib.as_ptr(), mib.len() as libc::c_uint, |
| dest.as_mut_ptr() as *mut _, &mut len, |
| ptr::null(), 0) |
| }; |
| if ret == -1 || len != dest.len() { |
| return Err(Error::with_cause( |
| ErrorKind::Unavailable, |
| "kern.arandom sysctl failed", |
| io::Error::last_os_error())); |
| } |
| Ok(()) |
| } |
| |
| fn max_chunk_size(&self) -> usize { 256 } |
| |
| fn method_str(&self) -> &'static str { "kern.arandom" } |
| } |