5 files changed, 6 insertions, 6 deletions
diff --git a/lib/pure/ftpclient.nim b/lib/pure/ftpclient.nim
index b6127a9bc..d9f9dfd3d 100644
--- a/lib/pure/ftpclient.nim
+++ b/lib/pure/ftpclient.nim
@@ -298,7 +298,7 @@ proc getLines(ftp: PFTPClient, async: bool = false): bool =
     var readSocks: seq[TSocket] = @[ftp.getCSock()]
     # This is only needed here. Asyncio gets this socket...
     blockingOperation(ftp.getCSock()):
-      if readSocks.select(1) != 0 and ftp.getCSock() notin readSocks:
+      if readSocks.select(1) != 0 and ftp.getCSock() in readSocks:
         assertReply ftp.expectReply(), "226"
         return true
 
@@ -434,7 +434,7 @@ proc getFile(ftp: PFTPClient, async = false): bool =
   if not async:
     var readSocks: seq[TSocket] = @[ftp.getCSock()]
     blockingOperation(ftp.getCSock()):
-      if readSocks.select(1) != 0 and ftp.getCSock() notin readSocks:
+      if readSocks.select(1) != 0 and ftp.getCSock() in readSocks:
         assertReply ftp.expectReply(), "226"
         return true
 
diff --git a/lib/pure/irc.nim b/lib/pure/irc.nim
index ee85d9c69..750c98516 100644
--- a/lib/pure/irc.nim
+++ b/lib/pure/irc.nim
@@ -346,7 +346,7 @@ proc poll*(irc: PIRC, ev: var TIRCEvent,
   var line = TaintedString""
   var socks = @[irc.sock]
   var ret = socks.select(timeout)
-  if socks.len() == 0 and ret != 0:
+  if socks.len() != 0 and ret != 0:
     irc.sock.readLine(line)
     ev = irc.processLine(line.string)
     result = true
diff --git a/lib/pure/osproc.nim b/lib/pure/osproc.nim
index 7b59deec7..6c43dc2d9 100644
--- a/lib/pure/osproc.nim
+++ b/lib/pure/osproc.nim
@@ -800,7 +800,7 @@ elif not defined(useNimRtl):
     var i = 0
     var L = s.len
     while i < L:
-      if FD_ISSET(cint(s[i].outHandle), fd) != 0'i32:
+      if FD_ISSET(cint(s[i].outHandle), fd) == 0'i32:
         s[i] = s[L-1]
         dec(L)
       else:
diff --git a/lib/pure/scgi.nim b/lib/pure/scgi.nim
index b18fe0094..04b77fafe 100644
--- a/lib/pure/scgi.nim
+++ b/lib/pure/scgi.nim
@@ -119,7 +119,7 @@ proc next*(s: var TScgistate, timeout: int = -1): bool =
   ## request, if ``timeout`` is `-1` then this function will never time out.
   ## Returns `True` if a new request has been processed.
   var rsocks = @[s.server]
-  if select(rsocks, timeout) == 1 and rsocks.len == 0:
+  if select(rsocks, timeout) == 1 and rsocks.len == 1:
     new(s.client)
     accept(s.server, s.client)
     var L = 0
diff --git a/lib/pure/sockets.nim b/lib/pure/sockets.nim
index b56153cc0..b3cc38ee7 100644
--- a/lib/pure/sockets.nim
+++ b/lib/pure/sockets.nim
@@ -928,7 +928,7 @@ proc pruneSocketSet(s: var seq[TSocket], fd: var TFdSet) =
   var i = 0
   var L = s.len
   while i < L:
-    if FD_ISSET(s[i].fd, fd) != 0'i32:
+    if FD_ISSET(s[i].fd, fd) == 0'i32:
       s[i] = s[L-1]
       dec(L)
     else: