Mark most C-derived enums as non_exhaustive

Since libc may add new variants at any time, Nix's consumers should not
use exhaustive match patterns.

Fixes #1182

1 files changed, 2 insertions, 0 deletions

diff --git a/src/sys/aio.rs b/src/sys/aio.rs
index b63affb8..71a2184d 100644
--- a/src/sys/aio.rs
+++ b/src/sys/aio.rs
@@ -39,6 +39,7 @@ libc_enum! {
     /// Mode for `AioCb::fsync`.  Controls whether only data or both data and
     /// metadata are synced.
     #[repr(i32)]
+    #[non_exhaustive]
     pub enum AioFsyncMode {
         /// do it like `fsync`
         O_SYNC,
@@ -57,6 +58,7 @@ libc_enum! {
     /// given `aiocb` should be used for a read operation, a write operation, or
     /// ignored.  Has no effect for any other aio functions.
     #[repr(i32)]
+    #[non_exhaustive]
     pub enum LioOpcode {
         LIO_NOP,
         LIO_WRITE,