1 files changed, 30 insertions, 0 deletions
diff --git a/third_party/rust/getrandom/src/dragonfly.rs b/third_party/rust/getrandom/src/dragonfly.rs
new file mode 100644
index 0000000000..d3ef00aa9c
--- /dev/null
+++ b/third_party/rust/getrandom/src/dragonfly.rs
@@ -0,0 +1,30 @@
+// Copyright 2021 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.
+
+//! Implementation for DragonFly BSD
+use crate::{
+    use_file,
+    util_libc::{sys_fill_exact, Weak},
+    Error,
+};
+use core::mem::MaybeUninit;
+
+pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
+    static GETRANDOM: Weak = unsafe { Weak::new("getrandom\0") };
+    type GetRandomFn = unsafe extern "C" fn(*mut u8, libc::size_t, libc::c_uint) -> libc::ssize_t;
+
+    // getrandom(2) was introduced in DragonflyBSD 5.7
+    if let Some(fptr) = GETRANDOM.ptr() {
+        let func: GetRandomFn = unsafe { core::mem::transmute(fptr) };
+        return sys_fill_exact(dest, |buf| unsafe {
+            func(buf.as_mut_ptr() as *mut u8, buf.len(), 0)
+        });
+    } else {
+        use_file::getrandom_inner(dest)
+    }
+}