From 631eb6783d1dbc64f031426436ab685008c31ca8 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Thu, 28 Nov 2019 22:19:42 -0300
Subject: [PATCH] add StreamServer.Options.reuse_address

this uses a bad direct interface with std.os.linux, this should add
setsockopt to std.os.
---
 lib/std/net.zig | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/std/net.zig b/lib/std/net.zig
index 53b75d8578..cd456c46c6 100644
--- a/lib/std/net.zig
+++ b/lib/std/net.zig
@@ -1290,6 +1290,9 @@ pub const StreamServer = struct {
         /// If more than this many connections pool in the kernel, clients will start
         /// seeing "Connection refused".
         kernel_backlog: u32 = 128,
+
+        /// Enable SO_REUSEADDR on the socket.
+        reuse_address: bool = false,
     };
 
     /// After this call succeeds, resources have been acquired and must
@@ -1320,6 +1323,19 @@ pub const StreamServer = struct {
             self.sockfd = null;
         }
 
+        // TODO proper interface with errors in std.os
+        var optval: c_int = 1;
+
+        if (self.options.reuse_address) {
+            _ = os.linux.setsockopt(
+                server.sockfd.?,
+                os.linux.SOL_SOCKET,
+                os.linux.SO_REUSEADDR,
+                @ptrCast([*]const u8, &optval),
+                @sizeOf(c_int),
+            );
+        }
+
         var socklen = address.getOsSockLen();
         try os.bind(sockfd, &address.any, socklen);
         try os.listen(sockfd, self.kernel_backlog);