Support random file of AIX

Author: ecnelises

src/lib.rs

@@ -188,7 +188,7 @@ pub use crate::error::Error;
 // These should all provide getrandom_inner with the same signature as getrandom.
 cfg_if! {
     if #[cfg(any(target_os = "emscripten", target_os = "haiku",
-                 target_os = "redox"))] {
+                 target_os = "redox", target_os = "aix"))] {
         mod util_libc;
         #[path = "use_file.rs"] mod imp;
     } else if #[cfg(any(target_os = "android", target_os = "linux"))] {

src/use_file.rs

@@ -26,7 +26,8 @@ use core::{
     target_os = "illumos"
 ))]
 const FILE_PATH: &str = "/dev/random\0";
-#[cfg(any(target_os = "android", target_os = "linux", target_os = "redox"))]
+#[cfg(any(target_os = "android", target_os = "linux",
+          target_os = "redox", target_os = "aix"))]
 const FILE_PATH: &str = "/dev/urandom\0";
 
 pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {

src/util_libc.rs

@@ -31,6 +31,8 @@ cfg_if! {
             fn __errno() -> *mut libc::c_int;
         }
         use __errno as errno_location;
+    } else if #[cfg(target_os = "aix")] {
+        use libc::_Errno as errno_location;
     }
 }