akr	2009-02-07 21:04:31 +0900 (Sat, 07 Feb 2009)

  New Revision: 22110

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=22110

  Log:
    add not about IO#pos and IO#readpartial.

  Modified files:
    branches/ruby_1_8/io.c

Index: ruby_1_8/io.c
===================================================================
--- ruby_1_8/io.c	(revision 22109)
+++ ruby_1_8/io.c	(revision 22110)
@@ -1351,6 +1351,9 @@
  *  The later means that readpartial is nonblocking-flag insensitive.
  *  It blocks on the situation IO#sysread causes Errno::EAGAIN as if the fd is blocking mode.
  *
+ *  Since readpartial bypass internal stdio buffering mechanism,
+ *  IO#pos may return wrong value after readpartial.
+ *  This problem is fixed by Ruby 1.9 which doesn't use stdio.
  */
 
 static VALUE

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