From 50e39069518a0c2643cd5e3189ad087b5fbed0c6 Mon Sep 17 00:00:00 2001
From: Kenta Iwasaki <63115601+lithdew@users.noreply.github.com>
Date: Fri, 4 Sep 2020 02:57:08 +0900
Subject: [PATCH] os: return error.SocketNotListening for EINVAL on accept
 (#6226)

---
 lib/std/net.zig | 3 +++
 lib/std/os.zig  | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/std/net.zig b/lib/std/net.zig
index 5a1407c35..45d8f07f0 100644
--- a/lib/std/net.zig
+++ b/lib/std/net.zig
@@ -1641,6 +1641,9 @@ pub const StreamServer = struct {
         /// by the socket buffer limits, not by the system memory.
         SystemResources,
 
+        /// Socket is not listening for new connections.
+        SocketNotListening,
+
         ProtocolFailure,
 
         /// Firewall rules forbid connection.
diff --git a/lib/std/os.zig b/lib/std/os.zig
index e8431c386..2e4cc3aed 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -2802,6 +2802,9 @@ pub const AcceptError = error{
     /// by the socket buffer limits, not by the system memory.
     SystemResources,
 
+    /// Socket is not listening for new connections.
+    SocketNotListening,
+
     ProtocolFailure,
 
     /// Firewall rules forbid connection.
@@ -2870,7 +2873,7 @@ pub fn accept(
             EBADF => unreachable, // always a race condition
             ECONNABORTED => return error.ConnectionAborted,
             EFAULT => unreachable,
-            EINVAL => unreachable,
+            EINVAL => return error.SocketNotListening,
             ENOTSOCK => unreachable,
             EMFILE => return error.ProcessFdQuotaExceeded,
             ENFILE => return error.SystemFdQuotaExceeded,