mirror of
https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
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a5ab76da1e
Add the D-Bus API definition and its implementation in the form of a GPIO manager daemon and a companion command-line client as well as some additional configuration and data files (systemd service, example udev configuration, etc.) and test suites. Tested-by: Alexander Sverdlin <alexander.sverdlin@siemens.com> Link: https://lore.kernel.org/r/20240812-dbus-v5-4-ead288509217@linaro.org Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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// SPDX-FileCopyrightText: 2022-2023 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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#include <gio/gio.h>
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#include <signal.h>
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#include "daemon-process.h"
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struct _GpiodbusDaemonProcess {
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GObject parent_instance;
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GSubprocess *proc;
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};
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G_DEFINE_TYPE(GpiodbusDaemonProcess, gpiodbus_daemon_process, G_TYPE_OBJECT);
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static gboolean on_timeout(gpointer data G_GNUC_UNUSED)
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{
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g_error("timeout reached waiting for the daemon name to appear on the system bus");
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return G_SOURCE_REMOVE;
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}
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static void on_name_appeared(GDBusConnection *con G_GNUC_UNUSED,
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const gchar *name G_GNUC_UNUSED,
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const gchar *name_owner G_GNUC_UNUSED,
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gpointer data)
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{
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gboolean *name_state = data;
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*name_state = TRUE;
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}
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static void gpiodbus_daemon_process_constructed(GObject *obj)
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{
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GpiodbusDaemonProcess *self = GPIODBUS_DAEMON_PROCESS_OBJ(obj);
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const gchar *path = g_getenv("GPIODBUS_TEST_DAEMON_PATH");
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g_autoptr(GDBusConnection) con = NULL;
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g_autofree gchar *addr = NULL;
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g_autoptr(GError) err = NULL;
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gboolean name_state = FALSE;
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guint watch_id, timeout_id;
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if (!path)
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g_error("GPIODBUS_TEST_DAEMON_PATH environment variable must be set");
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addr = g_dbus_address_get_for_bus_sync(G_BUS_TYPE_SYSTEM, NULL, &err);
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if (!addr)
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g_error("failed to get an address for system bus: %s",
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err->message);
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con = g_dbus_connection_new_for_address_sync(addr,
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G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
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G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
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NULL, NULL, &err);
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if (!con)
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g_error("failed to get a dbus connection: %s", err->message);
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watch_id = g_bus_watch_name_on_connection(con, "io.gpiod1",
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G_BUS_NAME_WATCHER_FLAGS_NONE,
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on_name_appeared, NULL,
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&name_state, NULL);
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self->proc = g_subprocess_new(G_SUBPROCESS_FLAGS_STDOUT_SILENCE |
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G_SUBPROCESS_FLAGS_STDERR_SILENCE,
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&err, path, NULL);
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if (!self->proc)
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g_error("failed to launch the gpio-manager process: %s",
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err->message);
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timeout_id = g_timeout_add_seconds(5, on_timeout, NULL);
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while (!name_state)
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g_main_context_iteration(NULL, TRUE);
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g_bus_unwatch_name(watch_id);
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g_source_remove(timeout_id);
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G_OBJECT_CLASS(gpiodbus_daemon_process_parent_class)->constructed(obj);
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}
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static void gpiodbus_daemon_process_kill(GSubprocess *proc)
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{
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g_autoptr(GError) err = NULL;
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gint status;
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g_subprocess_send_signal(proc, SIGTERM);
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g_subprocess_wait(proc, NULL, &err);
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if (err)
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g_error("failed to collect the exit status of gpio-manager: %s",
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err->message);
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if (!g_subprocess_get_if_exited(proc))
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g_error("dbus-manager process did not exit normally");
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status = g_subprocess_get_exit_status(proc);
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if (status != 0)
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g_error("dbus-manager process exited with a non-zero status: %d",
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status);
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g_object_unref(proc);
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}
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static void gpiodbus_daemon_process_dispose(GObject *obj)
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{
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GpiodbusDaemonProcess *self = GPIODBUS_DAEMON_PROCESS_OBJ(obj);
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g_clear_pointer(&self->proc, gpiodbus_daemon_process_kill);
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G_OBJECT_CLASS(gpiodbus_daemon_process_parent_class)->dispose(obj);
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}
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static void
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gpiodbus_daemon_process_class_init(GpiodbusDaemonProcessClass *proc_class)
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{
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GObjectClass *class = G_OBJECT_CLASS(proc_class);
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class->constructed = gpiodbus_daemon_process_constructed;
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class->dispose = gpiodbus_daemon_process_dispose;
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}
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static void gpiodbus_daemon_process_init(GpiodbusDaemonProcess *self)
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{
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self->proc = NULL;
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}
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GpiodbusDaemonProcess *gpiodbus_daemon_process_new(void)
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{
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return g_object_new(GPIODBUS_DAEMON_PROCESS_TYPE, NULL);
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}
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