commit da70784bd2048f7f1a8934711e5e24f975d68b0b
Author: Cedric Cellier <address@hidden>
Date:   Tue Jun 21 16:30:45 2011 +0200

    Fix fport_input_waiting when fd > SELECT_SET_SIZE (cherry-picked from 1-8-8)
    
      By allowing this function to use poll instead of select.

diff --git a/libguile/fports.c b/libguile/fports.c
index 0b84d44..f19d291 100644
--- a/libguile/fports.c
+++ b/libguile/fports.c
@@ -49,7 +49,9 @@
 #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE
 #include <sys/stat.h>
 #endif
-
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
 #include <errno.h>
 #include <sys/types.h>
 
@@ -585,7 +587,14 @@ scm_fdes_to_port (int fdes, char *mode, SCM name)
 static int
 fport_input_waiting (SCM port)
 {
-#ifdef HAVE_SELECT
+#ifdef HAVE_POLL
+  int fdes = SCM_FSTREAM (port)->fdes;
+  struct pollfd pollfd = { fdes, POLLIN, 0 };
+  if (poll(&pollfd, 1, 0) < 0)
+    scm_syserror ("fport_input_waiting");
+  return pollfd.revents & POLLIN ? 1 : 0;
+
+#elif defined(HAVE_SELECT)
   int fdes = SCM_FSTREAM (port)->fdes;
   struct timeval timeout;
   SELECT_TYPE read_set;