akr	2011-10-29 20:58:30 +0900 (Sat, 29 Oct 2011)

  New Revision: 33554

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=33554

  Log:
    add a comment.

  Modified files:
    trunk/io.c

Index: io.c
===================================================================
--- io.c	(revision 33553)
+++ io.c	(revision 33554)
@@ -192,6 +192,7 @@
 {
     int ret;
 #ifdef O_CLOEXEC
+    /* O_CLOEXEC is available since Linux 2.6.23.  Linux 2.6.18 silently ignore it. */
     flags |= O_CLOEXEC;
 #endif
     ret = open(pathname, flags, mode);

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