examples: new SMS sending example in C using the async API

examples/sms-c/Makefile.am

@@ -1,4 +1,4 @@
-noinst_PROGRAMS = sms-c-sync
+noinst_PROGRAMS = sms-c-sync sms-c-async
 
 sms_c_sync_CPPFLAGS = \
 	$(WARN_CFLAGS) \
@@ -23,3 +23,27 @@ sms_c_sync_LDFLAGS = \
 	$(WARN_LDFLAGS) \
 	$(MMCLI_LIBS) \
 	$(NULL)
+
+sms_c_async_CPPFLAGS = \
+	$(WARN_CFLAGS) \
+	$(MMCLI_CFLAGS) \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/include \
+	-I$(top_builddir)/include \
+	-I$(top_srcdir)/libmm-glib \
+	-I${top_srcdir}/libmm-glib/generated \
+	-I${top_builddir}/libmm-glib/generated \
+	$(NULL)
+
+sms_c_async_SOURCES = \
+	sms-c-async.c \
+	$(NULL)
+
+sms_c_async_LDADD = \
+	$(top_builddir)/libmm-glib/libmm-glib.la \
+	$(NULL)
+
+sms_c_async_LDFLAGS = \
+	$(WARN_LDFLAGS) \
+	$(MMCLI_LIBS) \
+	$(NULL)

examples/sms-c/sms-c-async.c

@@ -0,0 +1,197 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) 2021 Aleksander Morgado <aleksander@aleksander.es>
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <locale.h>
+#include <string.h>
+
+#include <glib.h>
+#include <gio/gio.h>
+
+#include <libmm-glib.h>
+
+typedef struct {
+    GMainLoop        *loop;
+    GDBusConnection  *connection;
+    MMManager        *manager;
+    GList            *objects;
+    MMSmsProperties  *properties;
+
+    MMObject         *current_obj;
+    MMModemMessaging *current_messaging;
+    MMSms            *current_sms;
+} Context;
+
+static void send_sms_next (Context *context);
+
+static void
+sms_send_ready (MMSms        *sms,
+                GAsyncResult *res,
+                Context      *context)
+{
+    g_autoptr(GError) error = NULL;
+
+    if (!mm_sms_send_finish (sms, res, &error))
+        g_printerr ("error: couldn't send sms in modem %s: %s\n",
+                    mm_object_get_path (context->current_obj),
+                    error->message);
+    else
+        g_print ("successfully sent sms in modem %s\n",
+                 mm_object_get_path (context->current_obj));
+
+    send_sms_next (context);
+}
+
+static void
+messaging_create_ready (MMModemMessaging *messaging,
+                        GAsyncResult     *res,
+                        Context          *context)
+{
+    g_autoptr(GError) error = NULL;
+
+    context->current_sms = mm_modem_messaging_create_finish (messaging, res, &error);
+    if (!context->current_sms) {
+        g_printerr ("error: couldn't create sms in modem %s: %s\n",
+                    mm_object_get_path (context->current_obj),
+                    error->message);
+        send_sms_next (context);
+        return;
+    }
+
+    mm_sms_send (context->current_sms,
+                 NULL,
+                 (GAsyncReadyCallback) sms_send_ready,
+                 context);
+}
+
+static void
+send_sms_next (Context *context)
+{
+    g_clear_object (&context->current_sms);
+    g_clear_object (&context->current_messaging);
+    g_clear_object (&context->current_obj);
+
+    if (!context->objects) {
+        g_main_loop_quit (context->loop);
+        return;
+    }
+
+    context->current_obj = context->objects->data;
+    context->objects = g_list_delete_link (context->objects, context->objects);
+
+    context->current_messaging = mm_object_get_modem_messaging (context->current_obj);
+    if (!context->current_messaging) {
+        g_printerr ("error: modem %s does not have messaging capabilities\n",
+                    mm_object_get_path (context->current_obj));
+        send_sms_next (context);
+        return;
+    }
+
+    mm_modem_messaging_create (context->current_messaging,
+                               context->properties,
+                               NULL,
+                               (GAsyncReadyCallback)messaging_create_ready,
+                               context);
+}
+
+static void
+manager_new_ready (GObject      *source,
+                   GAsyncResult *res,
+                   Context      *context)
+{
+    g_autofree gchar *name_owner = NULL;
+    g_autoptr(GError) error = NULL;
+
+    context->manager = mm_manager_new_finish (res, &error);
+    if (!context->connection) {
+        g_printerr ("error: couldn't get manager: %s\n", error->message);
+        exit (EXIT_FAILURE);
+    }
+
+    name_owner = g_dbus_object_manager_client_get_name_owner (G_DBUS_OBJECT_MANAGER_CLIENT (context->manager));
+    if (!name_owner) {
+        g_printerr ("error: ModemManager not found in the system bus\n");
+        exit (EXIT_FAILURE);
+    }
+
+    context->objects = g_dbus_object_manager_get_objects (G_DBUS_OBJECT_MANAGER (context->manager));
+    if (!context->objects) {
+        g_printerr ("error: no modems found\n");
+        exit (EXIT_FAILURE);
+    }
+
+    send_sms_next (context);
+}
+
+static void
+bus_get_ready (GObject      *source,
+               GAsyncResult *res,
+               Context      *context)
+{
+    g_autoptr(GError) error = NULL;
+
+    context->connection = g_bus_get_finish (res, &error);
+    if (!context->connection) {
+        g_printerr ("error: couldn't get bus: %s\n", error->message);
+        exit (EXIT_FAILURE);
+    }
+
+    mm_manager_new (context->connection,
+                    G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START,
+                    NULL,
+                    (GAsyncReadyCallback) manager_new_ready,
+                    context);
+}
+
+int main (int argc, char **argv)
+{
+    Context context = { 0 };
+
+    if (argc < 3) {
+        g_printerr ("error: missing arguments\n");
+        g_printerr ("usage: %s <NUMBER> <TEXT>\n", argv[0]);
+        exit (EXIT_FAILURE);
+    }
+
+    context.properties = mm_sms_properties_new ();
+	mm_sms_properties_set_number (context.properties, argv[1]);
+	mm_sms_properties_set_text   (context.properties, argv[2]);
+
+    g_bus_get (G_BUS_TYPE_SYSTEM,
+               NULL,
+               (GAsyncReadyCallback) bus_get_ready,
+               &context);
+
+    context.loop = g_main_loop_new (NULL, FALSE);
+    g_main_loop_run (context.loop);
+
+    g_assert (!context.current_obj);
+    g_assert (!context.current_messaging);
+    g_assert (!context.current_sms);
+
+    g_main_loop_unref (context.loop);
+    g_clear_object (&context.connection);
+    g_clear_object (&context.manager);
+    g_clear_object (&context.properties);
+    g_list_free_full (g_steal_pointer (&context.objects), g_object_unref);
+
+    return 0;
+}