Ian Jackson
2011-Jan-27 14:59 UTC
[Xen-devel] [PATCH] libxc: provide XENCTRL_HAS_XC_INTERFACE feature test macro
# 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. + */ /* _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel