Vendor things

third-party/vendor/getrandom/src/solaris_illumos.rs

@@ -0,0 +1,41 @@
+//! Implementation for the Solaris family
+//!
+//! `/dev/random` uses the Hash_DRBG with SHA512 algorithm from NIST SP 800-90A.
+//! `/dev/urandom` uses the FIPS 186-2 algorithm, which is considered less
+//! secure. We choose to read from `/dev/random` (and use GRND_RANDOM).
+//!
+//! Solaris 11.3 and late-2018 illumos added the getrandom(2) libc function.
+//! To make sure we can compile on both Solaris and its derivatives, as well as
+//! function, we check for the existence of getrandom(2) in libc by calling
+//! libc::dlsym.
+use crate::{
+    use_file,
+    util_libc::{sys_fill_exact, Weak},
+    Error,
+};
+use core::mem::{self, MaybeUninit};
+
+static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
+type GetRandomFn =
+    unsafe extern "C" fn(*mut libc::c_void, libc::size_t, libc::c_uint) -> libc::ssize_t;
+
+pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
+    if let Some(fptr) = GETRANDOM.ptr() {
+        let func: GetRandomFn = unsafe { mem::transmute(fptr) };
+        // 256 bytes is the lowest common denominator across all the Solaris
+        // derived platforms for atomically obtaining random data.
+        for chunk in dest.chunks_mut(256) {
+            sys_fill_exact(chunk, |buf| unsafe {
+                // A cast is needed for the flags as libc uses the wrong type.
+                func(
+                    buf.as_mut_ptr() as *mut libc::c_void,
+                    buf.len(),
+                    libc::GRND_RANDOM as libc::c_uint,
+                )
+            })?
+        }
+        Ok(())
+    } else {
+        use_file::getrandom_inner(dest)
+    }
+}