eis: implement an fd backend

Caller opens the socket, passes it to eis, done.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

meson.build

@@ -66,6 +66,7 @@ lib_libeis = shared_library('eis',
     'src/libeis-client.c',
     'src/libeis-device.c',
     'src/libeis-socket.c',
+    'src/libeis-fd.c',
     proto_headers,
     dependencies: [dep_libutil, dep_protobuf],
     install: true

src/libeis-fd.c

@@ -0,0 +1,91 @@
+/*
+ * Copyright © 2020 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#include "util-logger.h"
+#include "util-mem.h"
+#include "util-macros.h"
+#include "util-sources.h"
+#include "util-strings.h"
+
+#include "libeis.h"
+#include "libeis-private.h"
+
+struct eis_fd {
+	struct object object;
+};
+
+static inline struct eis_fd *
+eis_fd(struct eis *eis)
+{
+	return eis->backend;
+}
+
+static inline void
+eis_fd_destroy(struct eis_fd *eis_fd)
+{
+}
+
+OBJECT_IMPLEMENT_CREATE(eis_fd);
+static
+OBJECT_IMPLEMENT_UNREF(eis_fd);
+
+static void
+interface_fd_destroy(struct eis *eis, void *backend)
+{
+	struct eis_fd *fd = backend;
+	eis_fd_unref(fd);
+}
+
+static const struct eis_backend_interface interface = {
+	.destroy = interface_fd_destroy,
+};
+
+_public_ int
+eis_setup_backend_fd(struct eis *eis)
+{
+	assert(eis);
+	assert(!eis->backend);
+
+	eis->backend = eis_fd_create(&eis->object);
+	eis->backend_interface = interface;
+
+	return 0;
+}
+
+_public_ int
+eis_backend_fd_add_fd(struct eis *eis, int fd)
+{
+	assert(eis);
+	assert(eis->backend);
+
+	if (eis_client_new(eis, fd) != NULL)
+		return 0;
+	else
+		return -ENOMEM;
+}

src/libeis-socket.c

@@ -73,7 +73,7 @@ interface_socket_destroy(struct eis *eis, void *backend)
 
 }
 
-const struct eis_backend_interface interface = {
+static const struct eis_backend_interface interface = {
 	.destroy = interface_socket_destroy,
 };
 

src/libeis.h

@@ -143,6 +143,18 @@ eis_dbus_init(struct eis *ctx);
 int
 eis_setup_backend_socket(struct eis *ctx, const char *path);
 
+/**
+ * Initialize the context that can take pre-configured sockets.
+ */
+int
+eis_setup_backend_fd(struct eis *ctx);
+
+/**
+ * Add a new client to a context set up with eis_setup_backend_fd()
+ */
+int
+eis_backend_fd_add_fd(struct eis *ctx, int fd);
+
 int
 eis_get_fd(struct eis *eis);