From 14a954f3507d97e1a6e6c995f3e4d3db76c64b3d Mon Sep 17 00:00:00 2001
From: nia <nia@netbsd.org>
Date: Fri, 1 May 2020 17:22:27 +0100
Subject: [PATCH] Add arc4random_buf() in NetBSD libc, use it to implement
 getrandom()

---
 lib/std/c/netbsd.zig | 1 +
 lib/std/os.zig       | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index f3c34b5cad..20960b3f77 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -9,6 +9,7 @@ pub const _errno = __errno;
 pub const dl_iterate_phdr_callback = extern fn (info: *dl_phdr_info, size: usize, data: ?*c_void) c_int;
 pub extern "c" fn dl_iterate_phdr(callback: dl_iterate_phdr_callback, data: ?*c_void) c_int;
 
+pub extern "c" fn arc4random_buf(buf: [*]u8, len: usize) void;
 pub extern "c" fn __fstat50(fd: fd_t, buf: *Stat) c_int;
 pub extern "c" fn __stat50(path: [*:0]const u8, buf: *Stat) c_int;
 pub extern "c" fn __clock_gettime50(clk_id: c_int, tp: *timespec) c_int;
diff --git a/lib/std/os.zig b/lib/std/os.zig
index 06a4c12dfc..9502e8d9df 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -153,6 +153,10 @@ pub fn getrandom(buffer: []u8) GetRandomError!void {
         }
         return;
     }
+    if (builtin.os.tag == .netbsd) {
+        netbsd.arc4random_buf(buffer.ptr, buffer.len);
+        return;
+    }
     if (builtin.os.tag == .wasi) {
         switch (wasi.random_get(buffer.ptr, buffer.len)) {
             0 => return,