don't enable REUSEPORT when listening on unix socket

Author: karlseguin

src/httpz.zig

@@ -381,10 +381,13 @@ pub fn Server(comptime H: type) type {
             }
 
             try posix.setsockopt(listener, posix.SOL.SOCKET, posix.SO.REUSEADDR, &std.mem.toBytes(@as(c_int, 1)));
-            if (@hasDecl(posix.SO, "REUSEPORT_LB")) {
-                try posix.setsockopt(listener, posix.SOL.SOCKET, posix.SO.REUSEPORT_LB, &std.mem.toBytes(@as(c_int, 1)));
-            } else if (@hasDecl(posix.SO, "REUSEPORT")) {
-                try posix.setsockopt(listener, posix.SOL.SOCKET, posix.SO.REUSEPORT, &std.mem.toBytes(@as(c_int, 1)));
+
+            if (config.unix_path == null) {
+                if (@hasDecl(posix.SO, "REUSEPORT_LB")) {
+                    try posix.setsockopt(listener, posix.SOL.SOCKET, posix.SO.REUSEPORT_LB, &std.mem.toBytes(@as(c_int, 1)));
+                } else if (@hasDecl(posix.SO, "REUSEPORT")) {
+                    try posix.setsockopt(listener, posix.SOL.SOCKET, posix.SO.REUSEPORT, &std.mem.toBytes(@as(c_int, 1)));
+                }
             }
 
             {