poll() is totally broken on Mac OS X

Even on 10.5.8, poll() does not do the right thing. Haven't checked on
newer versions. Hence, wrap all occurences of poll() to pa_poll and
emulate that call with select() on OSX. This is totally embarassing.

src/pulsecore/poll.h

@@ -24,6 +24,10 @@
    Copyright (C) 1994,96,97,98,99,2000,2001,2004 Free Software Foundation, Inc.
 ***/
 
+#if defined(HAVE_POLL_H)
+#include <poll.h>
+#else
+
 /* Event types that can be polled for.  These bits may be set in `events'
    to indicate the interesting event types; they will appear in `revents'
    to indicate the status of the file descriptor.  */
@@ -38,10 +42,6 @@
 #define POLLHUP         0x010           /* Hung up.  */
 #define POLLNVAL        0x020           /* Invalid polling request.  */
 
-
-/* Type used for the number of file descriptors.  */
-typedef unsigned long int nfds_t;
-
 /* Data structure describing a polling request.  */
 struct pollfd
   {
@@ -50,9 +50,17 @@ struct pollfd
     short int revents;          /* Types of events that actually occurred.  */
   };
 
+
 /* Poll the file descriptors described by the NFDS structures starting at
    FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
    an event to occur; if TIMEOUT is -1, block until an event occurs.
    Returns the number of file descriptors with events, zero if timed out,
    or -1 for errors.  */
-extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);
+
+#endif /* HAVE_POLL_H */
+
+#if defined(HAVE_POLL_H) && !defined(OS_IS_DARWIN)
+#define pa_poll(fds,nfds,timeout) poll((fds),(nfds),(timeout))
+#else
+int pa_poll (struct pollfd *fds, unsigned long nfds, int timeout);
+#endif