* ext/io/wait/wait.c (io_ready_p): updated to follow RDoc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@21168 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Mon Dec 29 17:52:16 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* ext/io/wait/wait.c (io_ready_p): updated to follow RDoc.
+
 Mon Dec 29 16:52:15 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* ext/socket/socket.c (s_recvfrom_nonblock): revert r21162.

ext/io/wait/wait.c

@@ -46,7 +46,8 @@ EXTERN struct timeval rb_time_interval _((VALUE time));
  * call-seq:
  *   io.ready? -> true, false or nil
  *
- * Returns non-nil if input available without blocking, or nil.
+ * Returns true if input available without blocking, or false.
+ * Returns nil if no information available.
  */
 
 static VALUE
@@ -58,10 +59,10 @@ io_ready_p(VALUE io)
     GetOpenFile(io, fptr);
     rb_io_check_readable(fptr);
     if (rb_io_read_pending(fptr)) return Qtrue;
-    if (!FIONREAD_POSSIBLE_P(fptr->fd)) return Qfalse;
-    if (ioctl(fptr->fd, FIONREAD, &n)) rb_sys_fail(0);
-    if (n > 0) return ioctl_arg2num(n);
-    return Qnil;
+    if (!FIONREAD_POSSIBLE_P(fptr->fd)) return Qnil;
+    if (ioctl(fptr->fd, FIONREAD, &n)) return Qnil;
+    if (n > 0) return Qtrue;
+    return Qfalse;
 }
 
 struct wait_readable_arg {