migration: Export functions to create send channels

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

migration/socket.c

@@ -28,6 +28,28 @@
 #include "trace.h"
 
 
+struct SocketOutgoingArgs {
+    SocketAddress *saddr;
+} outgoing_args;
+
+void socket_send_channel_create(QIOTaskFunc f, void *data)
+{
+    QIOChannelSocket *sioc = qio_channel_socket_new();
+    qio_channel_socket_connect_async(sioc, outgoing_args.saddr,
+                                     f, data, NULL, NULL);
+}
+
+int socket_send_channel_destroy(QIOChannel *send)
+{
+    /* Remove channel */
+    object_unref(OBJECT(send));
+    if (outgoing_args.saddr) {
+        qapi_free_SocketAddress(outgoing_args.saddr);
+        outgoing_args.saddr = NULL;
+    }
+    return 0;
+}
+
 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
 {
     SocketAddress *saddr;
@@ -95,6 +117,11 @@ static void socket_start_outgoing_migration(MigrationState *s,
     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
 
     data->s = s;
+
+    /* in case previous migration leaked it */
+    qapi_free_SocketAddress(outgoing_args.saddr);
+    outgoing_args.saddr = saddr;
+
     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
         data->hostname = g_strdup(saddr->u.inet.host);
     }
@@ -106,7 +133,6 @@ static void socket_start_outgoing_migration(MigrationState *s,
                                      data,
                                      socket_connect_data_free,
                                      NULL);
-    qapi_free_SocketAddress(saddr);
 }
 
 void tcp_start_outgoing_migration(MigrationState *s,

migration/socket.h

@@ -16,6 +16,13 @@
 
 #ifndef QEMU_MIGRATION_SOCKET_H
 #define QEMU_MIGRATION_SOCKET_H
+
+#include "io/channel.h"
+#include "io/task.h"
+
+void socket_send_channel_create(QIOTaskFunc f, void *data);
+int socket_send_channel_destroy(QIOChannel *send);
+
 void tcp_start_incoming_migration(const char *host_port, Error **errp);
 
 void tcp_start_outgoing_migration(MigrationState *s, const char *host_port,