[CRIU] [PATCH] lib: Add start page-server support

[Radostin Stoyanov]

Starting a page-server is already present in rpc, so lets add it to
libcriu too.

Usage Example:
	#include <stdio.h>
	#include <fcntl.h>
	#include <criu/criu.h>

	int main( void  )
	{
		int dir_fd;

	    if ((dir_fd = open("/tmp/dump", O_DIRECTORY)) < 0) {
			printf("Can't open images dir");
	        return -1;
		}

		criu_init_opts();
		criu_set_images_dir_fd(dir_fd);
		criu_start_page_server("0.0.0.0", 1234);

		return 0;
	}

Signed-off-by: Radostin Stoyanov <rstoyanov1 at gmail.com>
---
 lib/c/criu.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 lib/c/criu.h |  2 ++
 2 files changed, 49 insertions(+)

diff --git a/lib/c/criu.c b/lib/c/criu.c
index 08806c6e..e2ed8d2b 100644
--- a/lib/c/criu.c
+++ b/lib/c/criu.c
@@ -1396,3 +1396,50 @@ int criu_restore_child(void)
 {
 	return criu_local_restore_child(global_opts);
 }
+
+int criu_local_start_page_server(criu_opts *opts, char *address, int port)
+{
+	int ret = -1;
+	CriuReq req = CRIU_REQ__INIT;
+	CriuResp *resp = NULL;
+
+	req.type = CRIU_REQ_TYPE__PAGE_SERVER;
+	req.opts = opts->rpc;
+
+	req.opts->ps = malloc(sizeof(CriuPageServerInfo));
+	if (req.opts->ps == NULL) {
+		perror("Can't allocate memory for criu RPC page-server opts");
+		goto exit;
+	}
+	criu_page_server_info__init(req.opts->ps);
+
+	req.opts->ps->has_port = true;
+	req.opts->ps->port = port;
+	req.opts->ps->address = strdup(address);
+
+	ret = send_req_and_recv_resp(opts, &req, &resp);
+	if (ret)
+		goto exit;
+
+	if (resp->type != req.type)
+		ret = -EBADMSG;
+	else if (resp->success)
+		ret = resp->ps->pid;
+	else
+		ret = -EBADE;
+
+exit:
+	if (resp)
+		criu_resp__free_unpacked(resp, NULL);
+
+	swrk_wait(opts);
+
+	errno = saved_errno;
+
+	return ret;
+}
+
+int criu_start_page_server(char *address, int port)
+{
+	return criu_local_start_page_server(global_opts, address, port);
+}
diff --git a/lib/c/criu.h b/lib/c/criu.h
index 5d0b5b6c..8a08841b 100644
--- a/lib/c/criu.h
+++ b/lib/c/criu.h
@@ -135,6 +135,7 @@ int criu_check(void);
 int criu_dump(void);
 int criu_restore(void);
 int criu_restore_child(void);
+int criu_start_page_server(char *address, int port);
 
 /*
  * Perform dumping but with preliminary iterations. Each
@@ -214,6 +215,7 @@ int criu_local_dump(criu_opts *opts);
 int criu_local_restore(criu_opts *opts);
 int criu_local_restore_child(criu_opts *opts);
 int criu_local_dump_iters(criu_opts *opts, int (*more)(criu_predump_info pi));
+int criu_local_start_page_server(criu_opts *opts, char *address, int port);
 
 #ifdef __GNUG__
 }
-- 
2.14.3