std: implement the `random` feature

Implements the ACP https://github.com/rust-lang/libs-team/issues/393.

1 files changed, 13 insertions, 0 deletions

diff --git a/library/std/src/sys/random/fuchsia.rs b/library/std/src/sys/random/fuchsia.rs
new file mode 100644
index 00000000000..77d72b3c5b7
--- /dev/null
+++ b/library/std/src/sys/random/fuchsia.rs
@@ -0,0 +1,13 @@
+//! Random data generation using the Zircon kernel.
+//!
+//! Fuchsia, as always, is quite nice and provides exactly the API we need:
+//! <https://fuchsia.dev/reference/syscalls/cprng_draw>.
+
+#[link(name = "zircon")]
+extern "C" {
+    fn zx_cprng_draw(buffer: *mut u8, len: usize);
+}
+
+pub fn fill_bytes(bytes: &mut [u8]) {
+    unsafe { zx_cprng_draw(bytes.as_mut_ptr(), bytes.len()) }
+}