[Xen-changelog] When xc_linux_build fails without a meaninful errno, force errno to EINVAL

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User vhanquez@xxxxxxxxxxxxxxxxxxxxxxx
# Node ID 18fa851b6dc6ca5893709b480cf38ee7c5ef445e
# Parent  a543a4778a7d9888fad13ffafff0aa9bc5541b48
When xc_linux_build fails without a meaninful errno, force errno to EINVAL
avoid message "Error creating domain: (0, 'Error')" in the case 
domU version is too old or too new.

Signed-off-by: Vincent Hanquez <vincent@xxxxxxxxxxxxx>

diff -r a543a4778a7d -r 18fa851b6dc6 tools/python/xen/lowlevel/xc/xc.c
--- a/tools/python/xen/lowlevel/xc/xc.c Thu Feb 16 15:46:21 2006
+++ b/tools/python/xen/lowlevel/xc/xc.c Thu Feb 16 16:19:38 2006
@@ -347,9 +347,11 @@
     if ( xc_linux_build(self->xc_handle, dom, image,
                         ramdisk, cmdline, flags,
                         store_evtchn, &store_mfn, 
-                       console_evtchn, &console_mfn) != 0 )
-        return PyErr_SetFromErrno(xc_error);
-    
+                       console_evtchn, &console_mfn) != 0 ) {
+        if (!errno)
+             errno = EINVAL;
+        return PyErr_SetFromErrno(xc_error);
+    }
     return Py_BuildValue("{s:i,s:i}", 
                         "store_mfn", store_mfn,
                         "console_mfn", console_mfn);

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