(8) [final] modify main() to call correct clean sequence

[systembsd.git] / src / interfaces / logind / logind.c

diff --git a/src/interfaces/logind/logind.c b/src/interfaces/logind/logind.c
index 9e35d0f9d8805e3bfc0ee81494337fa364650a2e..274bf16aa14da40ec78d71372351ab11be2d9c5f 100644 (file)
--- a/src/interfaces/logind/logind.c
+++ b/src/interfaces/logind/logind.c
@@ -13,8 +13,169 @@
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
+
+#include <unistd.h>
+#include <limits.h>
+#include <signal.h>
+
+#include <sys/param.h>
+#include <string.h>
+
+#include <glib/gprintf.h>
+#include <glib-unix.h>
+
 #include "logind-gen.h"
+#include "logind.h"
+
+GPtrArray *logind_freeable;
+Login1Manager *logind_interf;
+
+GMainLoop *logind_loop;
+
+guint bus_descriptor;
+gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
+
+/* --- begin method/property/dbus signal code --- */
+
+/*static gboolean
+on_handle_set_hostname(Login1Manager *hn1_passed_interf,
+                       GDBusMethodInvocation *invoc,
+                       const gchar *greet,
+                       gpointer data) {
+    return FALSE;
+}*/
+
+/*const gchar *
+our_get_hostname() {
+
+       gchar *hostname_buf, *ret;
+       size_t hostname_divider;
+
+       hostname_buf = (gchar*) g_malloc0(MAXHOSTNAMELEN);
+       ret          = (gchar*) g_malloc0(MAXHOSTNAMELEN);
+       g_ptr_array_add(logind_freeable, hostname_buf);
+       g_ptr_array_add(logind_freeable, ret);
+
+       if(gethostname(hostname_buf, MAXHOSTNAMELEN))
+               return "";
+
+       hostname_divider = strcspn(hostname_buf, ".");
+
+       return strncpy(ret, hostname_buf, hostname_divider);
+}*/
+
+/* --- end method/property/dbus signal code, begin bus/name handlers --- */
+
+static void logind_on_bus_acquired(GDBusConnection *conn,
+                                   const gchar *name,
+                                   gpointer user_data) {
+
+    g_print("got bus/name, exporting %s's interface...\n", name);
+
+    logind_interf = login1_manager_skeleton_new();
+
+    /* attach function pointers to generated struct's method handlers
+    g_signal_connect(logind_interf, "handle-set-hostname", G_CALLBACK(on_handle_set_hostname), NULL); */
+
+    /* set our properties before export
+    login1_manager_set_hostname(logind_interf, our_get_hostname()); */
+ 
+    if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(logind_interf),
+                                         conn,
+                                         "/org/freedesktop/login1_manager",
+                                         NULL)) {
+
+        g_printf("failed to export %s's interface!\n", name);
+        logind_mem_clean();
+
+    } else {
+
+        dbus_interface_exported = TRUE;
+        g_printf("exported %s's interface on the system bus...\n", name);
+    }
+}
+
+static void logind_on_name_acquired(GDBusConnection *conn,
+                                       const gchar *name,
+                                    gpointer user_data) {
+
+   g_printf("success!\n");
+}
+
+static void logind_on_name_lost(GDBusConnection *conn,
+                                const gchar *name,
+                                gpointer user_data) {
+
+    if(!conn) {
+
+        g_printf("failed to connect to the system bus while trying to acquire name '%s': either dbus-daemon isn't running or we don't have permission to push names and/or their interfaces to it.\n", name);
+
+    }
+
+    g_print("lost name %s, exiting...\n", name);
+
+    logind_mem_clean();
+}
+
+/* --- end bus/name handlers, begin misc unix functions --- */
+
+/* safe call to clean and then exit
+ * this stops our GMainLoop sfaely before letting main() return */
+void logind_mem_clean() {
+
+    g_printf("exiting...\n");
+
+    if(dbus_interface_exported)
+        g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(logind_interf));
+
+    if(g_main_loop_is_running(logind_loop))
+        g_main_loop_quit(logind_loop);
+
+}
+
+/* wrapper for glib's unix signal handling; called only once if terminating signal is raised against us */
+gboolean unix_sig_terminate_handler(gpointer data) {
+
+    g_printf("caught SIGINT/HUP/TERM, exiting\n");
+
+    logind_mem_clean();
+    return G_SOURCE_REMOVE;
+}
+
+void set_signal_handlers() {
+
+    /* we don't care about its descriptor, we never need to unregister these */
+    g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
+    g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
+    g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
+}
 
 int main() {
+
+    set_signal_handlers();
+
+       logind_loop = g_main_loop_new(NULL, TRUE);
+       logind_freeable = g_ptr_array_new();
+
+        bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
+                                    "org.freedesktop.login1_manager",
+                                    G_BUS_NAME_OWNER_FLAGS_NONE,
+                                    logind_on_bus_acquired,
+                                    logind_on_name_acquired,
+                                    logind_on_name_lost,
+                                    NULL,
+                                    NULL);
+
+       g_main_loop_run(logind_loop);
+    /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
+       g_main_loop_unref(logind_loop);
+
+    /* guaranteed unownable */
+       g_bus_unown_name(bus_descriptor);
+
+    /* at this point no operations can occur with our data, it is safe to free it + its container */
+     g_ptr_array_free(logind_freeable, TRUE);
+
+
        return 0;
 }