infect-rpc: Split into priv and uapi parts

Some pieces from infect-rpc are used by criu's pie code
which will soon be moved into compel std plugin itself,
so prepare for this.
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/include/infect-rpc.h

@@ -11,51 +11,7 @@ extern int compel_rpc_call(unsigned int cmd, struct parasite_ctl *ctl);
 extern int compel_rpc_call_sync(unsigned int cmd, struct parasite_ctl *ctl);
 extern int compel_rpc_sock(struct parasite_ctl *ctl);
 
-struct ctl_msg {
-	uint32_t	cmd;			/* command itself */
-	uint32_t	ack;			/* ack on command */
-	int32_t		err;			/* error code on reply */
-};
-
-#define ctl_msg_cmd(_cmd)		\
-	(struct ctl_msg){.cmd = _cmd, }
-
-#define ctl_msg_ack(_cmd, _err)	\
-	(struct ctl_msg){.cmd = _cmd, .ack = _cmd, .err = _err, }
-
-/*
- * NOTE: each command's args should be arch-independed sized.
- * If you want to use one of the standard types, declare
- * alternative type for compatible tasks in parasite-compat.h
- */
-enum {
-	PARASITE_CMD_IDLE		= 0,
-	PARASITE_CMD_ACK,
-
-	PARASITE_CMD_INIT_DAEMON,
-	PARASITE_CMD_UNMAP,
-
-	/*
-	 * This must be greater than INITs.
-	 */
-	PARASITE_CMD_FINI,
-
-	PARASITE_USER_CMDS,
-};
-
-struct parasite_init_args {
-	int32_t				h_addr_len;
-	struct sockaddr_un		h_addr;
-	int32_t				log_level;
-	uint64_t			sigreturn_addr;
-	uint64_t			sigframe; /* pointer to sigframe */
-	futex_t				daemon_connected;
-};
-
-struct parasite_unmap_args {
-	uint64_t	parasite_start;
-	uint64_t	parasite_len;
-};
+#define PARASITE_USER_CMDS	64
 
 
 #endif

criu/include/rpc-pie-priv.h

+#ifndef __COMPEL_RPC_H__
+#define __COMPEL_RPC_H__
+struct ctl_msg {
+	uint32_t	cmd;			/* command itself */
+	uint32_t	ack;			/* ack on command */
+	int32_t		err;			/* error code on reply */
+};
+
+#define ctl_msg_cmd(_cmd)		\
+	(struct ctl_msg){.cmd = _cmd, }
+
+#define ctl_msg_ack(_cmd, _err)	\
+	(struct ctl_msg){.cmd = _cmd, .ack = _cmd, .err = _err, }
+
+/*
+ * NOTE: each command's args should be arch-independed sized.
+ * If you want to use one of the standard types, declare
+ * alternative type for compatible tasks in parasite-compat.h
+ */
+enum {
+	PARASITE_CMD_IDLE		= 0,
+	PARASITE_CMD_ACK,
+
+	PARASITE_CMD_INIT_DAEMON,
+	PARASITE_CMD_UNMAP,
+
+	/*
+	 * This must be greater than INITs.
+	 */
+	PARASITE_CMD_FINI,
+
+	__PARASITE_END_CMDS,
+};
+
+struct parasite_init_args {
+	int32_t				h_addr_len;
+	struct sockaddr_un		h_addr;
+	int32_t				log_level;
+	uint64_t			sigreturn_addr;
+	uint64_t			sigframe; /* pointer to sigframe */
+	futex_t				daemon_connected;
+};
+
+struct parasite_unmap_args {
+	uint64_t	parasite_start;
+	uint64_t	parasite_len;
+};
+#endif

criu/infect-rpc.c

@@ -6,11 +6,14 @@
 #include "infect.h"
 #include "infect-priv.h"
 #include "infect-rpc.h"
+#include "rpc-pie-priv.h"
 
 static int __parasite_send_cmd(int sockfd, struct ctl_msg *m)
 {
 	int ret;
 
+	BUILD_BUG_ON(PARASITE_USER_CMDS < __PARASITE_END_CMDS);
+
 	ret = send(sockfd, m, sizeof(*m), 0);
 	if (ret == -1) {
 		pr_perror("Failed to send command %d to daemon", m->cmd);

criu/infect.c

@@ -27,6 +27,7 @@
 #include "infect-rpc.h"
 #include "infect-priv.h"
 #include "infect-util.h"
+#include "rpc-pie-priv.h"
 
 #define UNIX_PATH_MAX (sizeof(struct sockaddr_un) - \
 			(size_t)((struct sockaddr_un *) 0)->sun_path)

criu/pie/infect.c

@@ -8,6 +8,7 @@
 #include "sigframe.h"
 #include "infect-rpc.h"
 #include "infect-pie.h"
+#include "rpc-pie-priv.h"
 
 static int tsock = -1;