crtools: initial skeleton for cr_service

The criu service is a daemon, that opens a unix socket and listens for
incoming requests. The requests will be declared in protobuf/rpc.proto
and for now will only contain the 'dump' request.
Signed-off-by: Ruslan Kuprieiev <kupruser@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile.crtools

@@ -53,6 +53,7 @@ obj-y	+= stats.o
 obj-y	+= string.o
 obj-y	+= sigframe.o
 obj-y	+= arch/$(ARCH)/vdso.o
+obj-y	+= cr-service.o
 
 ifneq ($(MAKECMDGOALS),clean)
 incdeps := y

cr-service.c

+#include "cr-service.h"
+
+int cr_service()
+{
+	return 0;
+}

crtools.c

@@ -29,6 +29,7 @@
 #include "page-xfer.h"
 #include "tty.h"
 #include "file-lock.h"
+#include "cr-service.h"
 
 struct cr_options opts;
 
@@ -334,6 +335,9 @@ int main(int argc, char *argv[])
 	if (!strcmp(argv[optind], "page-server"))
 		return cr_page_server(opts.restore_detach);
 
+	if (!strcmp(argv[optind], "service"))
+		return cr_service();
+
 	pr_msg("Unknown command \"%s\"\n", argv[optind]);
 usage:
 	pr_msg("\n"

include/cr-service.h

+#ifndef __CR_SERVICE_H__
+#define __CR_SERVICE_H__
+
+int cr_service(void);
+
+#endif