From ad01edb37bdf7e1087eb18ed903b37dbc0241af1 Mon Sep 17 00:00:00 2001
From: James Peach <jpeach@samba.org>
Date: Tue, 31 Jan 2006 21:56:12 +0000
Subject: [PATCH] r13263: Check whether open(2) will accept the O_DIRECT flag.
 This should fix the build on NetBSD. (This used to be commit
 7354de62a7fbf3921dfcb0bd865e89bdf1ef5bcd)

---
 source4/build/m4/rewrite.m4 | 12 ++++++++++++
 source4/client/cifsddio.c   |  7 ++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/source4/build/m4/rewrite.m4 b/source4/build/m4/rewrite.m4
index f0279c69d06..cd393713544 100644
--- a/source4/build/m4/rewrite.m4
+++ b/source4/build/m4/rewrite.m4
@@ -496,6 +496,18 @@ fi
 ;;
 esac
 
+AC_CACHE_CHECK([for O_DIRECT flag to open(2)],samba_cv_HAVE_OPEN_O_DIRECT,[
+AC_TRY_COMPILE([
+#include <unistd.h>
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif],
+[int fd = open("/dev/null", O_DIRECT);],
+samba_cv_HAVE_OPEN_O_DIRECT=yes,samba_cv_HAVE_OPEN_O_DIRECT=no)])
+if test x"$samba_cv_HAVE_OPEN_O_DIRECT" = x"yes"; then
+    AC_DEFINE(HAVE_OPEN_O_DIRECT,1,[Whether the open(2) accepts O_DIRECT])
+fi 
+
 ###############################################
 # test for where we get crypt() from
 AC_CHECK_LIB_EXT(crypt, CRYPT_LIBS, crypt)
diff --git a/source4/client/cifsddio.c b/source4/client/cifsddio.c
index 51528406bf4..b13cf3fd08c 100644
--- a/source4/client/cifsddio.c
+++ b/source4/client/cifsddio.c
@@ -99,8 +99,13 @@ open_fd_handle(const char * path, uint64_t iosz, int options)
 	fdh->h.io_write = fd_write_func;
 	fdh->h.io_seek = fd_seek_func;
 
-	if (options & DD_DIRECT_IO)
+	if (options & DD_DIRECT_IO) {
+#ifdef HAVE_OPEN_O_DIRECT
 		oflags |= O_DIRECT;
+#else
+		DEBUG(1, ("no support for direct IO on this platform\n"));
+#endif
+	}
 
 	if (options & DD_SYNC_IO)
 		oflags |= O_SYNC;