akr	2009-01-31 14:12:23 +0900 (Sat, 31 Jan 2009)

  New Revision: 21910

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=21910

  Log:
    rdoc update.

  Modified files:
    trunk/io.c

Index: io.c
===================================================================
--- io.c	(revision 21909)
+++ io.c	(revision 21910)
@@ -1899,6 +1899,17 @@
  *  The result may also be smaller than string.length (partial write).
  *  The caller should care such errors and partial write.
  *
+ *    # Creates a pipe.
+ *    r, w = IO.pipe
+ *
+ *    # write_nonblock writes only 65536 bytes and return 65536.
+ *    # (The pipe size is 65536 bytes on this environment.)
+ *    s = "a" * 100000
+ *    p w.write_nonblock(s)     #=> 65536
+ *
+ *    # write_nonblock cannot write a byte and raise EWOULDBLOCK (EAGAIN).
+ *    p w.write_nonblock("b")   # Resource temporarily unavailable (Errno::EAGAIN)
+ *
  *  If the write buffer is not empty, it is flushed at first.
  *
  *  When write_nonblock raises EWOULDBLOCK,

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