Description: Supported in GLIBC and in Solaris libc
Index: icon/ipl/cfuncs/fpoll.c
===================================================================
--- icon.orig/ipl/cfuncs/fpoll.c	2013-01-28 19:02:21.859991668 +0000
+++ icon/ipl/cfuncs/fpoll.c	2013-01-28 19:07:16.982669113 +0000
@@ -29,6 +29,7 @@
 */
 
 #include <stdio.h>
+#include <stdio_ext.h>
 #include <string.h>	/* for memset call from FD_ZERO (solaris gcc) */
 #include <sys/types.h>
 #include <sys/time.h>
@@ -58,21 +59,8 @@
       msec = IntegerVal(argv[2]);
       }
 
-   /* check for data already in buffer */
-   /* there's no legal way to do this in C; we cheat */
-#if defined(__GLIBC__) && defined(_STDIO_USES_IOSTREAM)	/* new GCC library */
-   if (f->_IO_read_ptr < f->_IO_read_end)
+   if (__fpending(f))
       RetArg(1);
-#elif defined(__GLIBC__)				/* old GCC library */
-   if (f->__bufp < f->__get_limit)
-      RetArg(1);
-#elif defined(_FSTDIO)					/* new BSD library */
-   if (f->_r > 0)
-      RetArg(1);
-#else							/* old AT&T library */
-   if (f->_cnt > 0)
-      RetArg(1);
-#endif
 
    /* set up select(2) structure */
    FD_ZERO(&fds);			/* clear file bits */