feature request: O_DIRECTIO could be used on Tru64

[Lemley James - jlemle]

Hi coreutils fans, while attempting to use direct I/O with dd on Tru64
5.1B, I discovered that Tru64 doesn't define O_DIRECT as coreutils 5.93
is expecting, but does define O_DIRECTIO which seems to act as I expect
direct I/O to act. 

The open(2) man page states:  O_DIRECTIO [Tru64 UNIX]
      Enables direct I/O on a file.

Making this change to src/system.h allows the flag "direct" to be used
with dd on Tru64, and also appears to affect how the coreutil "shred"
opens a file.

Simple change follows; you may wish to implement differently.  
------------------

--- system.h.orig    Wed Sep 28 17:11:06 2005
+++ system.h        Tue Feb  7 16:04:32 2006
@@ -157,7 +157,12 @@
 #endif
 
 #if !defined O_DIRECT
+/* Tru64 has this defined as O_DIRECTIO */
+#if !defined O_DIRECTIO
 # define O_DIRECT 0
+#else 
+# define O_DIRECT O_DIRECTIO
+#endif
 #endif
 
 #if !defined O_DSYNC

------------------
Thanks, 
James Lemley
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