[PATCH RFC 1/8] golang/xenlight: Create stub package

[Ronald Rojas <ronladred@gmail.com>]

Create a basic Makefile to build and install libxenlight Golang
bindings. Also add a stub package which only opens libxl context.

Include a global xenlight.Ctx variable which can be used as the
default context by the entire program if desired.

For now, return simple errors. Proper error handling will be
added in next patch.

Signed-off-by: Ronald Rojas <ronladred@gmail.com>
---
 tools/Makefile                    | 17 ++++++++
 tools/golang/xenlight/Makefile    | 31 ++++++++++++++
 tools/golang/xenlight/xenlight.go | 86 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 134 insertions(+)
 create mode 100644 tools/golang/xenlight/Makefile
 create mode 100644 tools/golang/xenlight/xenlight.go

diff --git a/tools/Makefile b/tools/Makefile
index 77e0723..c1e975f 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -11,6 +11,8 @@ SUBDIRS-y += xenstore
 SUBDIRS-y += misc
 SUBDIRS-y += examples
 SUBDIRS-y += hotplug
+#Uncomment line to build Golang libxl
+#SUBDIRS-y += golang/xenlight
 SUBDIRS-y += xentrace
 SUBDIRS-$(CONFIG_XCUTILS) += xcutils
 SUBDIRS-$(CONFIG_X86) += firmware
@@ -303,6 +305,21 @@ subdir-clean-qemu-xen-dir:
 		$(MAKE) -C qemu-xen-dir clean; \
 	fi
 
+subdir-clean-golang/xenlight: .phony
+	$(MAKE) -C golang/xenlight clean
+
+subdir-distclean-golang/xenlight: .phony
+	$(MAKE) -C golang/xenlight distclean
+
+subdir-install-golang/xenlight: .phony
+	$(MAKE) -C golang/xenlight install
+
+subdir-all-golang/xenlight: .phony
+	$(MAKE) -C golang/xenlight all
+
+subdir-distclean-firmware: .phony
+	$(MAKE) -C firmware distclean
+
 subdir-clean-debugger/gdbsx subdir-distclean-debugger/gdbsx: .phony
 	$(MAKE) -C debugger/gdbsx clean
 
diff --git a/tools/golang/xenlight/Makefile b/tools/golang/xenlight/Makefile
new file mode 100644
index 0000000..1c2a2b7
--- /dev/null
+++ b/tools/golang/xenlight/Makefile
@@ -0,0 +1,31 @@
+XEN_ROOT=$(CURDIR)/../../..
+GOLANG_SRC=$(GOPATH)/src/xenproject.org/xenlight
+CGO_CFLAGS = -I$(DESTDIR)$(includedir)
+CGO_LDFLAGS = -L$(DESTDIR)$(libdir) -Wl,-rpath-link=$(DESTDIR)$(libdir)
+include $(XEN_ROOT)/tools/Rules.mk
+
+BINARY = xenlight.a
+GO ?= go
+
+.PHONY: all
+all: build
+
+.PHONY: build
+build: xenlight.a
+
+.PHONY: install
+install: build
+	$(INSTALL_DIR) $(DESTDIR)$(GOLANG_SRC)
+	$(INSTALL_DATA) xenlight.go $(DESTDIR)$(GOLANG_SRC)
+
+.PHONY: clean
+clean:
+	$(RM) $(BINARY)
+
+.PHONY: distclean
+distclean: clean
+
+xenlight.a: xenlight.go
+	CGO_CFLAGS="$(CGO_CFLAGS)" CGO_LDFLAGS="$(CGO_LDFLAGS)" $(GO) build -o $@ $<
+
+-include $(DEPS)
diff --git a/tools/golang/xenlight/xenlight.go b/tools/golang/xenlight/xenlight.go
new file mode 100644
index 0000000..f82e14e
--- /dev/null
+++ b/tools/golang/xenlight/xenlight.go
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2016 George W. Dunlap, Citrix Systems UK Ltd
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of the
+ * License only.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+package xenlight
+
+/*
+#cgo LDFLAGS: -lxenlight -lyajl
+#include <stdlib.h>
+#include <libxl.h>
+*/
+import "C"
+
+/*
+ * Other flags that may be needed at some point:
+ *  -lnl-route-3 -lnl-3
+ *
+ * To get back to static linking:
+ * #cgo LDFLAGS: -lxenlight -lyajl_s -lxengnttab -lxenstore -lxenguest -lxentoollog -lxenevtchn -lxenctrl -lblktapctl -lxenforeignmemory -lxencall -lz -luuid -lutil
+*/
+
+import (
+	"fmt"
+	"unsafe"
+)
+
+
+/*
+ * Types: Builtins
+ */
+type Context struct {
+	ctx *C.libxl_ctx
+}
+
+/*
+ * Context
+ */
+var Ctx Context
+
+func (Ctx *Context) IsOpen() bool {
+	return Ctx.ctx != nil
+}
+
+func (Ctx *Context) Open() (err error) {
+	if Ctx.ctx != nil {
+		return
+	}
+
+	ret := C.libxl_ctx_alloc(unsafe.Pointer(&Ctx.ctx), C.LIBXL_VERSION, 0, nil)
+
+	if ret != 0 {
+		err = Error(-ret)
+	}
+	return
+}
+
+func (Ctx *Context) Close() (err error) {
+	ret := C.libxl_ctx_free(unsafe.Pointer(Ctx.ctx))
+	Ctx.ctx = nil
+
+	if ret != 0 {
+		err = Error(-ret)
+	}
+	return
+}
+
+func (Ctx *Context) CheckOpen() (err error) {
+	if Ctx.ctx == nil {
+		err = fmt.Errorf("Context not opened")
+	}
+	return
+}
\ No newline at end of file
-- 
2.7.4


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