Add checks for invalid socket when creating sockets.

compiler/service.nim

@@ -84,6 +84,7 @@ proc serve*(action: proc (){.nimcall.}) =
   of "tcp", "":
     when useCaas:
       var server = socket()
+      if server == invalidSocket: osError(osLastError())
       let p = getConfigVar("server.port")
       let port = if p.len > 0: parseInt(p).TPort else: 6000.TPort
       server.bindAddr(port, getConfigVar("server.address"))

lib/pure/ftpclient.nim

@@ -107,6 +107,7 @@ proc ftpClient*(address: string, port = TPort(21),
   result.isAsync = false
   result.dsockConnected = false
   result.csock = socket()
+  if result.csock == InvalidSocket: osError(osLastError())
 
 proc getDSock(ftp: PFTPClient): TSocket =
   if ftp.isAsync: return ftp.asyncDSock else: return ftp.dsock
@@ -213,6 +214,7 @@ proc pasv(ftp: PFTPClient) =
   ## Negotiate a data connection.
   if not ftp.isAsync:
     ftp.dsock = socket()
+    if ftp.dsock == InvalidSocket: osError(osLastError())
   else:
     ftp.asyncDSock = AsyncSocket()
     ftp.asyncDSock.handleRead =

lib/pure/httpclient.nim

@@ -288,6 +288,7 @@ proc request*(url: string, httpMethod = httpGET, extraHeaders = "",
   add(headers, "\c\L")
   
   var s = socket()
+  if s == InvalidSocket: osError(osLastError())
   var port = sockets.TPort(80)
   if r.scheme == "https":
     when defined(ssl):

lib/pure/irc.nim

@@ -249,6 +249,7 @@ proc reconnect*(irc: PIRC, timeout = 5000) =
   if secSinceReconnect < timeout:
     sleep(timeout - secSinceReconnect)
   irc.sock = socket()
+  if irc.sock == InvalidSocket: osError(osLastError())
   irc.connect()
   irc.lastReconnect = epochTime()
 
@@ -274,6 +275,7 @@ proc irc*(address: string, port: TPort = 6667.TPort,
   result.messageBuffer = @[]
   result.status = SockIdle
   result.sock = socket()
+  if result.sock == InvalidSocket: osError(osLastError())
 
 proc processLine(irc: PIRC, line: string): TIRCEvent =
   if line.len == 0:

lib/pure/scgi.nim

@@ -102,6 +102,7 @@ proc open*(s: var TScgiState, port = TPort(4000), address = "127.0.0.1",
   s.input = newString(s.buflen) # will be reused
   
   s.server = socket()
+  if s.server == InvalidSocket: osError(osLastError())
   new(s.client) # Initialise s.client for `next`
   if s.server == InvalidSocket: scgiError("could not open socket")
   #s.server.connect(connectionName, port)

lib/pure/selectors.nim

@@ -238,6 +238,7 @@ when isMainModule:
       sock: TSocket
   
   var sock = socket()
+  if sock == InvalidSocket: osError(osLastError())
   #sock.setBlocking(false)
   sock.connect("irc.freenode.net", TPort(6667))
   

tests/stdlib/tsockets.nim

@@ -1,6 +1,7 @@
 import sockets
 var s: TSocket
 s = socket()
+if s == InvalidSocket: osError(osLastError())
 
 s.connect("www.google.com", TPort(80))