Automatically refresh the device list in manager mode
authorMikko Rasa <tdb@tdb.fi>
Thu, 25 Feb 2016 18:43:38 +0000 (20:43 +0200)
committerMikko Rasa <tdb@tdb.fi>
Thu, 25 Feb 2016 18:57:50 +0000 (20:57 +0200)
main.c

diff --git a/main.c b/main.c
index 59bf3050d4e12d8f768933fa0415168729aa0bf3..541354870f1ab131bf13ccbdb69d1e6f8ec5b22d 100644 (file)
--- a/main.c
+++ b/main.c
@@ -11,6 +11,7 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <sys/select.h>
+#include <sys/inotify.h>
 #include <gtk/gtk.h>
 #include <gdk/gdkkeysyms.h>
 
@@ -37,6 +38,10 @@ typedef struct sGuiContext
        GtkWidget *list;
        GtkWidget *button;
        char *post_mount_command;
+       int inotify_fd;
+       int dev_wd;
+       GIOChannel *inotify_channel;
+       int refresh_pending;
 } GuiContext;
 
 int verbosity = 0;
@@ -821,6 +826,19 @@ int refresh_devices(GuiContext *context, int umount)
        return n_listed;
 }
 
+/**
+Handles an automatic refresh of the device list in response to inotify events.
+*/
+gboolean refresh_devices_idle(gpointer data)
+{
+       GuiContext *context = (GuiContext *)data;
+
+       refresh_devices(context, -1);
+       context->refresh_pending = 0;
+
+       return FALSE;
+}
+
 /**
 Callback for selection in the device list changing.  Updates the action button
 label according to device status.
@@ -945,6 +963,32 @@ gboolean key_press(GtkWidget *widget, GdkEvent *event, gpointer user_data)
        return FALSE;
 }
 
+/**
+Callback for inotify events.
+*/
+gboolean inotify_event_available(GIOChannel *source, GIOCondition condition, gpointer user_data)
+{
+       GuiContext *context = (GuiContext *)user_data;
+       int fd;
+       char eventbuf[sizeof(struct inotify_event)+NAME_MAX+1];
+       int len;
+
+       fd = g_io_channel_unix_get_fd(source);
+       len = read(fd, eventbuf, sizeof(eventbuf));
+       if(len>=(int)sizeof(struct inotify_event))
+       {
+               if(!context->refresh_pending)
+               {
+                       g_timeout_add(500, &refresh_devices_idle, context);
+                       context->refresh_pending = 1;
+               }
+       }
+
+       (void)condition;
+
+       return TRUE;
+}
+
 void show_help(void)
 {
        printf("pmount-gui\n"
@@ -974,6 +1018,10 @@ int main(int argc, char **argv)
        context.manager = 0;
        context.devices = NULL;
        context.post_mount_command = NULL;
+       context.inotify_fd = -1;
+       context.dev_wd = -1;
+       context.inotify_channel = NULL;
+       context.refresh_pending = 0;
 
        gtk_init(&argc, &argv);
 
@@ -1034,6 +1082,19 @@ int main(int argc, char **argv)
                gtk_tree_view_column_add_attribute(mounted_column, mount_point_renderer, "text", 3);
 
                gtk_tree_view_insert_column(GTK_TREE_VIEW(context.list), mounted_column, -1);
+
+               context.inotify_fd = inotify_init();
+               if(context.inotify_fd>=0)
+               {
+                       context.dev_wd = inotify_add_watch(context.inotify_fd, "/dev/disk/by-id", IN_CREATE|IN_DELETE);
+
+                       context.inotify_channel = g_io_channel_unix_new(context.inotify_fd);
+                       g_io_add_watch(context.inotify_channel, G_IO_IN, &inotify_event_available, &context);
+               }
+               else
+                       printf("Warning: Unable to initialize inotify\n");
+
+               umount = -1;
        }
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(context.list));
@@ -1061,6 +1122,8 @@ int main(int argc, char **argv)
        gtk_main();
 
        free_devices(context.devices);
+       if(context.inotify_fd>=0)
+               close(context.inotify_fd);
 
        return 0;
 }