* [PATCH] libxc: provide XENCTRL_HAS_XC_INTERFACE feature test macro
@ 2011-01-27 14:59 Ian Jackson
0 siblings, 0 replies; only message in thread
From: Ian Jackson @ 2011-01-27 14:59 UTC (permalink / raw)
To: xen-devel
# HG changeset patch
# User Ian Jackson <ian.jackson@eu.citrix.com>
# Date 1296140344 0
# Node ID f346343cb9786978767e219c2bf8c116a169f6f2
# Parent 48008a2cbc1ed12696cd129d83196f3e04f6ab1b
libxc: provide XENCTRL_HAS_XC_INTERFACE feature test macro
This makes it easier for out-of-tree callers to tell which version of
the libxc interface this version of xenctrl.h provides.
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <Ian.Campbell@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
diff -r 48008a2cbc1e -r f346343cb978 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h Thu Jan 27 11:31:46 2011 +0000
+++ b/tools/libxc/xenctrl.h Thu Jan 27 14:59:04 2011 +0000
@@ -86,6 +86,16 @@
#else
#error "Define barriers"
#endif
+
+
+#define XENCTRL_HAS_XC_INTERFACE 1
+/* In Xen 4.0 and earlier, xc_interface_open and xc_evtchn_open would
+ * both return ints being the file descriptor. In 4.1 and later, they
+ * return an xc_interface* and xc_evtchn*, respectively - ie, a
+ * pointer to an opaque struct. This #define is provided in 4.1 and
+ * later, allowing out-of-tree callers to more easily distinguish
+ * between, and be compatible with, both versions.
+ */
/*
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2011-01-27 14:59 [PATCH] libxc: provide XENCTRL_HAS_XC_INTERFACE feature test macro Ian Jackson
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