lib: add inherit_fd

It is already present in CLI and RPC, so libcriu should reflect it too.

travis-ci: success for lib: add inherit_fd
Signed-off-by: Ruslan Kuprieiev <rkuprieiev@cloudlinux.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

lib/c/criu.c

@@ -799,6 +799,47 @@ int criu_add_irmap_path(char *path)
 	return criu_local_add_irmap_path(global_opts, path);
 }
 
+int criu_local_add_inherit_fd(criu_opts *opts, int fd, char *key)
+{
+	int nr;
+	InheritFd **a, *f;
+
+	/* Inheriting is only supported with swrk mode */
+	if (opts->service_comm != CRIU_COMM_BIN)
+		return -1;
+
+	f = malloc(sizeof(*f));
+	if (!f)
+		goto er;
+	inherit_fd__init(f);
+
+	f->fd = fd;
+	f->key = strdup(key);
+	if (!f->key)
+		goto er_f;
+
+	nr = opts->rpc->n_inherit_fd + 1;
+	a = realloc(opts->rpc->inherit_fd, nr * sizeof(f));
+	if (!a)
+		goto err_k;
+
+	a[nr - 1] = f;
+	opts->rpc->inherit_fd = a;
+	opts->rpc->n_inherit_fd = nr;
+	return 0;
+err_k:
+	free(f->key);
+er_f:
+	free(f);
+er:
+	return -ENOMEM;
+}
+
+int criu_add_inherit_fd(int fd, char *key)
+{
+	return criu_local_add_inherit_fd(global_opts, fd, key);
+}
+
 static CriuResp *recv_resp(int socket_fd)
 {
 	unsigned char *buf = NULL;

lib/c/criu.h

@@ -92,6 +92,7 @@ int criu_add_enable_fs(char *fs);
 int criu_add_skip_mnt(char *mnt);
 void criu_set_ghost_limit(unsigned int limit);
 int criu_add_irmap_path(char *path);
+int criu_add_inherit_fd(int fd, char *key);
 
 /*
  * The criu_notify_arg_t na argument is an opaque
@@ -200,6 +201,7 @@ int criu_local_add_irmap_path(criu_opts *opts, char *path);
 int criu_local_add_cg_props(criu_opts *opts, char *stream);
 int criu_local_add_cg_props_file(criu_opts *opts, char *path);
 int criu_local_add_cg_dump_controller(criu_opts *opts, char *name);
+int criu_local_add_inherit_fd(criu_opts *opts, int fd, char *key);
 
 void criu_local_set_notify_cb(criu_opts *opts, int (*cb)(char *action, criu_notify_arg_t na));