* fhandler_socket.cc (fhandler_socket::recv_internal): Fix a problem

with poll(2) after shutdown(SHUT_RD) has been called on the local side.
	* poll.cc (poll): Use POSIX type nfds_t for second parameter.  Drop
	special socket handling for POLLIN.  Add comment to explain why.
	* include/sys/poll.h: Declare nfds_t.  Use as type for second parameter
	in poll(2) declaration.

winsup/cygwin/ChangeLog

@@ -1,3 +1,12 @@
+2006-07-31  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler_socket.cc (fhandler_socket::recv_internal): Fix a problem
+	with poll(2) after shutdown(SHUT_RD) has been called on the local side.
+	* poll.cc (poll): Use POSIX type nfds_t for second parameter.  Drop
+	special socket handling for POLLIN.  Add comment to explain why.
+	* include/sys/poll.h: Declare nfds_t.  Use as type for second parameter
+	in poll(2) declaration.
+
 2006-07-31  Corinna Vinschen  <corinna@vinschen.de>
 
 	* fhandler_socket.cc (fhandler_socket::evaluate_events): Circumvent

winsup/cygwin/fhandler_socket.cc

@@ -1160,7 +1160,8 @@ fhandler_socket::recv_internal (WSABUF *wsabuf, DWORD wsacnt, DWORD flags,
   /* Note: Don't call WSARecvFrom(MSG_PEEK) without actually having data
      waiting in the buffers, otherwise the event handling gets messed up
      for some reason. */
-  while (!(res = wait_for_events (evt_mask | FD_CLOSE)))
+  while (!(res = wait_for_events (evt_mask | FD_CLOSE))
+	 || saw_shutdown_read ())
     {
       res = WSARecvFrom (get_socket (), wsabuf, wsacnt, &ret,
 			 &flags, from, fromlen, NULL, NULL);

winsup/cygwin/include/sys/poll.h

@@ -1,6 +1,6 @@
 /* sys/poll.h
 
-   Copyright 2000, 2001 Red Hat, Inc.
+   Copyright 2000, 2001, 2006 Red Hat, Inc.
 
    This file is part of Cygwin.
 
@@ -36,7 +36,9 @@ struct pollfd {
   short revents;
 };
 
-extern int poll __P ((struct pollfd *fds, unsigned int nfds, int timeout));
+typedef unsigned int nfds_t;
+
+extern int poll __P ((struct pollfd *fds, nfds_t nfds, int timeout));
 
 __END_DECLS
 

winsup/cygwin/poll.cc

@@ -27,7 +27,7 @@
 #include "sigproc.h"
 
 extern "C" int
-poll (struct pollfd *fds, unsigned int nfds, int timeout)
+poll (struct pollfd *fds, nfds_t nfds, int timeout)
 {
   int max_fd = 0;
   fd_set *read_fds, *write_fds, *except_fds;
@@ -90,39 +90,15 @@ poll (struct pollfd *fds, unsigned int nfds, int timeout)
 		fhandler_socket *sock;
 
 		if (FD_ISSET(fds[i].fd, read_fds))
-		  {
+		  /* This should be sufficient for sockets, too.  Using
-		    char peek[1];
+		     MSG_PEEK, as before, can be considered dangerous at
-		    sock = cygheap->fdtab[fds[i].fd]->is_socket ();
+		     best.  Quote from W. Richard Stevens: "The presence
-		    if (!sock)
+		     of an error can be considered either normal data or
-		      fds[i].revents |= POLLIN;
+		     an error (POLLERR).  In either case, a subsequent read
-		    else if (sock->listener ())
+		     will return -1 with errno set to the appropriate value."
-		      {
+		     So it looks like there's actually no good reason to
-			fds[i].revents |= POLLIN;
+		     return POLLERR. */
-		      }
+		  fds[i].revents |= POLLIN;
-		    else
-		      {
-			/* The following action can change errno.  We have to
-			   reset it to it's old value. */
-			int old_errno = get_errno ();
-			switch (sock->recvfrom (peek, sizeof (peek), MSG_PEEK,
-						NULL, NULL))
-			  {
-			    case -1:
-			      fds[i].revents |= POLLERR;
-			      break;
-			    case 0:  /* Closed on the read side... */
-			      /* ...or shutdown(SHUT_WR) on the write side.
-			         We set revents to POLLHUP until 1.5.18, but
-				 this is semantically borderline. */
-			      fds[i].revents |= POLLIN;
-			      break;
-			    default:
-			      fds[i].revents |= POLLIN;
-			      break;
-			  }
-			set_errno (old_errno);
-		      }
-		  }
 		/* Handle failed connect. */
 		if (FD_ISSET(fds[i].fd, write_fds)
 		    && (sock = cygheap->fdtab[fds[i].fd]->is_socket ())