Add TCP_NODELAY support #6795

2 files changed, 14 insertions, 1 deletions

diff --git a/lib/pure/net.nim b/lib/pure/net.nim
index b8d05642b..15f2c1228 100644
--- a/lib/pure/net.nim
+++ b/lib/pure/net.nim
@@ -145,7 +145,7 @@ type
 
   SOBool* = enum ## Boolean socket options.
     OptAcceptConn, OptBroadcast, OptDebug, OptDontRoute, OptKeepAlive,
-    OptOOBInline, OptReuseAddr, OptReusePort
+    OptOOBInline, OptReuseAddr, OptReusePort, OptNoDelay
 
   ReadLineResult* = enum ## result for readLineAsync
     ReadFullLine, ReadPartialLine, ReadDisconnected, ReadNone
@@ -869,6 +869,11 @@ proc close*(socket: Socket) =
 
     socket.fd.close()
 
+when defined(posix):
+  from posix import TCP_NODELAY
+else:
+  from winlean import TCP_NODELAY
+
 proc toCInt*(opt: SOBool): cint =
   ## Converts a ``SOBool`` into its Socket Option cint representation.
   case opt
@@ -880,6 +885,7 @@ proc toCInt*(opt: SOBool): cint =
   of OptOOBInline: SO_OOBINLINE
   of OptReuseAddr: SO_REUSEADDR
   of OptReusePort: SO_REUSEPORT
+  of OptNoDelay: TCP_NODELAY
 
 proc getSockOpt*(socket: Socket, opt: SOBool, level = SOL_SOCKET): bool {.
   tags: [ReadIOEffect].} =
@@ -902,6 +908,12 @@ proc getPeerAddr*(socket: Socket): (string, Port) =
 proc setSockOpt*(socket: Socket, opt: SOBool, value: bool, level = SOL_SOCKET) {.
   tags: [WriteIOEffect].} =
   ## Sets option ``opt`` to a boolean value specified by ``value``.
+  ##
+  ## .. code-block:: Nim
+  ##   var socket = newSocket()
+  ##   socket.setSockOpt(OptReusePort, true)
+  ##   socket.setSockOpt(OptNoDelay, true, level=IPPROTO_TCP.toInt)
+  ##
   var valuei = cint(if value: 1 else: 0)
   setSockOptInt(socket.fd, cint(level), toCInt(opt), valuei)
 
diff --git a/lib/windows/winlean.nim b/lib/windows/winlean.nim
index c3229cc7b..7eb268a9a 100644
--- a/lib/windows/winlean.nim
+++ b/lib/windows/winlean.nim
@@ -541,6 +541,7 @@ var
   SO_DONTLINGER* {.importc, header: "winsock2.h".}: cint
   SO_EXCLUSIVEADDRUSE* {.importc, header: "winsock2.h".}: cint # disallow local address reuse
   SO_ERROR* {.importc, header: "winsock2.h".}: cint
+  TCP_NODELAY* {.importc, header: "winsock2.h".}: cint
 
 proc `==`*(x, y: SocketHandle): bool {.borrow.}