ignore signal SIGPIPE on Darwin

lib/posix/posix.nim

@@ -1570,9 +1570,9 @@ else:
 
 
 when defined(macosx):
+  # We can't use the NOSIGNAL flag in the ``send`` function, it has no effect
   var
-    MSG_HAVEMORE* {.importc, header: "<sys/socket.h>".}: cint
-    MSG_NOSIGNAL* = MSG_HAVEMORE
+    MSG_NOSIGNAL* = 0'i32
 else:
   var
     MSG_NOSIGNAL* {.importc, header: "<sys/socket.h>".}: cint

lib/pure/rawsockets.nim

@@ -428,6 +428,10 @@ proc selectWrite*(writefds: var seq[SocketHandle],
   
   pruneSocketSet(writefds, (wr))
 
+# We ignore signal SIGPIPE on Darwin
+when defined(macosx):
+  signal(SIGPIPE, SIG_IGN)
+
 when defined(Windows):
   var wsa: WSAData
   if wsaStartup(0x0101'i16, addr wsa) != 0: raiseOSError(osLastError())