Refactor util_libc (#765)

This PR refactors `util_libc`, `sanitizer`, and `lazy` modules. The
modules are moved into the `utils` directory and "mounted" with
`#[path = ".."]`. With this change all uses of `#[path = ".."]` point
towards the `utils` directory.

Author: newpavlov

Cargo.lock

@@ -13,11 +13,9 @@ cfg_if! {
         pub use custom::*;
     } else if #[cfg(getrandom_backend = "linux_getrandom")] {
         mod getrandom;
-        mod sanitizer;
         pub use getrandom::*;
     } else if #[cfg(getrandom_backend = "linux_raw")] {
         mod linux_raw;
-        mod sanitizer;
         pub use linux_raw::*;
     } else if #[cfg(getrandom_backend = "rdrand")] {
         mod rdrand;
@@ -49,7 +47,6 @@ cfg_if! {
         pub use unsupported::*;
     } else if #[cfg(all(target_os = "linux", target_env = ""))] {
         mod linux_raw;
-        mod sanitizer;
         pub use linux_raw::*;
     } else if #[cfg(target_os = "espidf")] {
         mod esp_idf;
@@ -117,7 +114,6 @@ cfg_if! {
     ))] {
         mod use_file;
         mod linux_android_with_fallback;
-        mod sanitizer;
         pub use linux_android_with_fallback::*;
     } else if #[cfg(any(
         target_os = "android",
@@ -132,8 +128,6 @@ cfg_if! {
         all(target_os = "horizon", target_arch = "arm"),
     ))] {
         mod getrandom;
-        #[cfg(any(target_os = "android", target_os = "linux"))]
-        mod sanitizer;
         pub use getrandom::*;
     } else if #[cfg(target_os = "solaris")] {
         mod solaris;

src/backends.rs

@@ -12,15 +12,16 @@ use core::{ffi::c_void, mem::MaybeUninit};
 
 pub use crate::util::{inner_u32, inner_u64};
 
-#[path = "../util_libc.rs"]
-mod util_libc;
+#[path = "../utils/get_errno.rs"]
+mod utils;
 
 #[inline]
 pub fn fill_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
     for chunk in dest.chunks_mut(256) {
         let ret = unsafe { libc::getentropy(chunk.as_mut_ptr().cast::<c_void>(), chunk.len()) };
         if ret != 0 {
-            return Err(util_libc::last_os_error());
+            let errno = utils::get_errno();
+            return Err(Error::from_errno(errno));
         }
     }
     Ok(())