From 7b8c96612f1326525c655abe7f7bb0472cbddee1 Mon Sep 17 00:00:00 2001
From: Euan Torano <euantorano@gmail.com>
Date: Mon, 5 Aug 2019 17:21:12 +0100
Subject: [PATCH] Fix #2993 - use getrandom on freebsd

---
 std/c/freebsd.zig |  1 +
 std/os.zig        | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/std/c/freebsd.zig b/std/c/freebsd.zig
index bcc60e65ed..3d5736d37b 100644
--- a/std/c/freebsd.zig
+++ b/std/c/freebsd.zig
@@ -6,3 +6,4 @@ pub const _errno = __error;
 
 pub extern "c" fn getdents(fd: c_int, buf_ptr: [*]u8, nbytes: usize) usize;
 pub extern "c" fn sigaltstack(ss: ?*stack_t, old_ss: ?*stack_t) c_int;
+pub extern "c" fn getrandom(buf_ptr: [*]u8, buf_len: usize, flags: c_uint) c_int;
diff --git a/std/os.zig b/std/os.zig
index c2010bf6a9..805f7f1645 100644
--- a/std/os.zig
+++ b/std/os.zig
@@ -120,6 +120,19 @@ pub fn getrandom(buf: []u8) GetRandomError!void {
             }
         }
     }
+    if (freebsd.is_the_target) {
+        while (true) {
+            const err = std.c.getErrno(std.c.getrandom(buf.ptr, buf.len, 0));
+
+            switch (err) {
+                0 => return,
+                EINVAL => unreachable,
+                EFAULT => unreachable,
+                EINTR => continue,
+                else => return unexpectedErrno(err),
+            }
+        }
+    }
     if (wasi.is_the_target) {
         switch (wasi.random_get(buf.ptr, buf.len)) {
             0 => return,