From: Jeremy Allison <jra@samba.org>
Date: Fri, 6 Apr 2007 01:09:19 +0000 (+0000)
Subject: r22097: Add detection for linux readahead() syscall.
X-Git-Tag: samba-misc-tags/initial-v3-0-unstable~769
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4e3232aad4179e4ca9a1138bc43addec2ea6d9cc;p=thirdparty%2Fsamba.git

r22097: Add detection for linux readahead() syscall.
Jeremy.
---

diff --git a/source/configure.in b/source/configure.in
index 803425a66aa..7eb1b78a01b 100644
--- a/source/configure.in
+++ b/source/configure.in
@@ -5649,6 +5649,25 @@ samba_cv_HAVE_SENDFILE=yes,samba_cv_HAVE_SENDFILE=no)])
   AC_MSG_RESULT(yes)
 )
 
+############################################
+# See if we have the Linux readahead syscall.
+
+AC_CACHE_CHECK([for Linux readahead],
+                samba_cv_HAVE_LINUX_READAHEAD,[
+    AC_TRY_LINK([
+#if defined(HAVE_UNISTD_H)
+#include <unistd.h>
+#endif
+#include <fcntl.h>],
+    [ssize_t err = readahead(0,0,0x80000);],
+    samba_cv_HAVE_LINUX_READAHEAD=yes,
+    samba_cv_HAVE_LINUX_READAHEAD=no)])
+
+if test x"$samba_cv_HAVE_LINUX_READAHEAD" = x"yes"; then
+  AC_DEFINE(HAVE_LINUX_READAHEAD,1,
+             [Whether Linux readahead is available])
+fi
+
 
 #################################################
 # Check whether winbind is supported on this platform.  If so we need to