Fixes crashes when asyncdispatch.adjustTimeout returns a negative value. (#11231)

lib/pure/ioselects/ioselectors_epoll.nim

@@ -378,6 +378,8 @@ proc selectInto*[T](s: Selector[T], timeout: int,
   if maxres > len(results):
     maxres = len(results)
 
+  verifySelectParams(timeout)
+
   let count = epoll_wait(s.epollFD, addr(resTable[0]), maxres.cint,
                          timeout.cint)
   if count < 0:

lib/pure/ioselects/ioselectors_kqueue.nim

@@ -44,8 +44,8 @@ elif defined(netbsd) or defined(openbsd):
 when hasThreadSupport:
   type
     SelectorImpl[T] = object
-      kqFD : cint
-      maxFD : int
+      kqFD: cint
+      maxFD: int
       changes: ptr SharedArray[KEvent]
       fds: ptr SharedArray[SelectorKey[T]]
       count: int
@@ -57,8 +57,8 @@ when hasThreadSupport:
 else:
   type
     SelectorImpl[T] = object
-      kqFD : cint
-      maxFD : int
+      kqFD: cint
+      maxFD: int
       changes: seq[KEvent]
       fds: seq[SelectorKey[T]]
       count: int
@@ -447,6 +447,8 @@ proc selectInto*[T](s: Selector[T], timeout: int,
     ptv = addr tv
     maxres = MAX_KQUEUE_EVENTS
 
+  verifySelectParams(timeout)
+
   if timeout != -1:
     if timeout >= 1000:
       tv.tv_sec = posix.Time(timeout div 1_000)

lib/pure/ioselects/ioselectors_poll.nim

@@ -214,6 +214,8 @@ proc selectInto*[T](s: Selector[T], timeout: int,
   if maxres > len(results):
     maxres = len(results)
 
+  verifySelectParams(timeout)
+
   s.withPollLock():
     let count = posix.poll(addr(s.pollfds[0]), Tnfds(s.pollcnt), timeout)
     if count < 0:

lib/pure/ioselects/ioselectors_select.nim

@@ -309,6 +309,8 @@ proc selectInto*[T](s: Selector[T], timeout: int,
   var ptv = addr tv
   var rset, wset, eset: FdSet
 
+  verifySelectParams(timeout)
+
   if timeout != -1:
     when defined(genode):
       tv.tv_sec = Time(timeout div 1_000)