diff options
Diffstat (limited to 'getrandom/src/use_file.rs')
-rw-r--r-- | getrandom/src/use_file.rs | 73 |
1 files changed, 0 insertions, 73 deletions
diff --git a/getrandom/src/use_file.rs b/getrandom/src/use_file.rs deleted file mode 100644 index d3adaf2..0000000 --- a/getrandom/src/use_file.rs +++ /dev/null @@ -1,73 +0,0 @@ -// Copyright 2018 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. - -//! Implementations that just need to read from a file -use crate::util_libc::{last_os_error, open_readonly, sys_fill_exact, LazyFd}; -use crate::Error; - -#[cfg(target_os = "redox")] -const FILE_PATH: &str = "rand:\0"; -#[cfg(any( - target_os = "dragonfly", - target_os = "emscripten", - target_os = "haiku", - target_os = "macos", - target_os = "solaris", - target_os = "illumos" -))] -const FILE_PATH: &str = "/dev/random\0"; - -pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> { - static FD: LazyFd = LazyFd::new(); - let fd = FD.init(init_file).ok_or_else(last_os_error)?; - let read = |buf: &mut [u8]| unsafe { libc::read(fd, buf.as_mut_ptr() as *mut _, buf.len()) }; - - if cfg!(target_os = "emscripten") { - // `Crypto.getRandomValues` documents `dest` should be at most 65536 bytes. - for chunk in dest.chunks_mut(65536) { - sys_fill_exact(chunk, read)?; - } - } else { - sys_fill_exact(dest, read)?; - } - Ok(()) -} - -cfg_if! { - if #[cfg(any(target_os = "android", target_os = "linux"))] { - fn init_file() -> Option<libc::c_int> { - // Poll /dev/random to make sure it is ok to read from /dev/urandom. - let mut pfd = libc::pollfd { - fd: unsafe { open_readonly("/dev/random\0")? }, - events: libc::POLLIN, - revents: 0, - }; - - let ret = loop { - // A negative timeout means an infinite timeout. - let res = unsafe { libc::poll(&mut pfd, 1, -1) }; - if res == 1 { - break unsafe { open_readonly("/dev/urandom\0") }; - } else if res < 0 { - let e = last_os_error().raw_os_error(); - if e == Some(libc::EINTR) || e == Some(libc::EAGAIN) { - continue; - } - } - // We either hard failed, or poll() returned the wrong pfd. - break None; - }; - unsafe { libc::close(pfd.fd) }; - ret - } - } else { - fn init_file() -> Option<libc::c_int> { - unsafe { open_readonly(FILE_PATH) } - } - } -} |