[PATCH 1/4] xen: Take into account Xen control interface changes since Xen Ver. 4.1

[Daniel Kiper]

xc_interface_open() receive three arguments instead of void and returns
pointer to xc_interface type instead of int since Xen Ver. 4.1. Take into
account that and allow kexec-tools compilation with all versions of Xen.

Signed-off-by: Daniel Kiper <dkiper at net-space.pl>
---
 kexec/crashdump-xen.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/kexec/crashdump-xen.c b/kexec/crashdump-xen.c
index b347764..9dfabf8 100644
--- a/kexec/crashdump-xen.c
+++ b/kexec/crashdump-xen.c
@@ -126,19 +126,32 @@ unsigned long xen_architecture(struct crash_elf_info *elf_info)
 {
 	unsigned long machine = elf_info->machine;
 #ifdef HAVE_LIBXENCTRL
-	int xc, rc;
+	int rc;
 	xen_capabilities_info_t capabilities;
+#ifdef XENCTRL_HAS_XC_INTERFACE
+	xc_interface *xc;
+#else
+	int xc;
+#endif
 
 	if (!xen_present())
 		goto out;
 
 	memset(capabilities, '0', XEN_CAPABILITIES_INFO_LEN);
 
+#ifdef XENCTRL_HAS_XC_INTERFACE
+	xc = xc_interface_open(NULL, NULL, 0);
+	if ( !xc ) {
+		fprintf(stderr, "failed to open xen control interface.\n");
+		goto out;
+	}
+#else
 	xc = xc_interface_open();
 	if ( xc == -1 ) {
 		fprintf(stderr, "failed to open xen control interface.\n");
 		goto out;
 	}
+#endif
 
 	rc = xc_version(xc, XENVER_capabilities, &capabilities[0]);
 	if ( rc == -1 ) {
-- 
1.5.6.5