From 58b7057c7f0ae3ea50abc013e4801b2757699f37 Mon Sep 17 00:00:00 2001
From: Wei Liu <liuwe@microsoft.com>
Date: Wed, 16 Nov 2022 21:29:58 +0000
Subject: [PATCH] rate_limiter: add a safety comment

Signed-off-by: Wei Liu <liuwe@microsoft.com>
---
 rate_limiter/src/lib.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/rate_limiter/src/lib.rs b/rate_limiter/src/lib.rs
index 858220c90..9eefe934c 100644
--- a/rate_limiter/src/lib.rs
+++ b/rate_limiter/src/lib.rs
@@ -343,6 +343,7 @@ impl RateLimiter {
         let timer_fd = TimerFd::new()?;
         // Note: vmm_sys_util::TimerFd::new() open the fd w/o O_NONBLOCK. We manually add this flag
         // so that `Self::event_handler` won't be blocked with `vmm_sys_util::TimerFd::wait()`.
+        // SAFETY: FFI calls.
         let ret = unsafe {
             let fd = timer_fd.as_raw_fd();
             let mut flags = libc::fcntl(fd, libc::F_GETFL);