xl: Enable 'xl console' in 'x86_64'

[Yu Zhiguo <yuzg@cn.fujitsu.com>]

'xl console' cannot be used on arch 'x86_64',
because the path of 'xenconsole' is wrong.
Fix this bug.

Signed-off-by: Yu Zhiguo <yuzg@cn.fujitsu.com>

diff -r c87ec146229a -r bb537e15d23a tools/libxl/libxl.c
--- a/tools/libxl/libxl.c	Fri Apr 23 15:04:26 2010 +0100
+++ b/tools/libxl/libxl.c	Thu Apr 29 02:23:21 2010 +0800
@@ -28,6 +28,7 @@
 #include <stdint.h>
 #include <inttypes.h>
 #include <assert.h>
+#include <sys/utsname.h>
 
 #include "libxl.h"
 #include "libxl_utils.h"
@@ -741,8 +742,13 @@
 {
     struct stat st;
     const char *XENCONSOLE = "/usr/lib/xen/bin/xenconsole";
+    struct utsname utsbuf;
     char *cmd;
 
+    if (uname(&utsbuf) != -1) {
+        if (!strcmp(utsbuf.machine, "x86_64") || !strcmp(utsbuf.machine, "ia64"))
+            XENCONSOLE = "/usr/lib64/xen/bin/xenconsole";
+    }
     if (stat(XENCONSOLE, &st) != 0) {
         XL_LOG(ctx, XL_LOG_ERROR, "could not access %s", XENCONSOLE);
         return ERROR_FAIL;