I've made a simplified example of this and asked it on StackOverflow: http://stackoverflow.com/questions/28287520/cant-type-in-gtkentry-after-exiting-forked-window-manager
Any help is appreciated. On Fri Jan 30 2015 at 1:12:55 PM Gulshan Singh <gsingh2...@gmail.com> wrote: > I'm working on a display manager here: > https://github.com/gsingh93/display-manager/tree/tutorial (make sure > you're on the `tutorial` branch, not `master`). > > When a user successfully logs in, I fork a new process that starts the > window manager and wait for that process to terminate. Since this is a long > running operation, I need to do this in a new thread so I don't block the > GTK thread. > > However, I need to do various GTK operations during this long running > thread, such as updating label text or hiding the window. I've read online > that I should be using `gdk_threads_add_idle` to do this. > > Here are the relevant two functions: > ``` > static void* login_func(void *data) { > GtkWidget *widget = GTK_WIDGET(data); > const gchar *username = gtk_entry_get_text(user_text_field); > const gchar *password = gtk_entry_get_text(pass_text_field); > > gdk_threads_add_idle(set_status_label_text, "Logging in..."); > pid_t child_pid; > if (login(username, password, &child_pid)) { > gdk_threads_add_idle(hide_widget, widget); > > // Wait for child process to finish (wait for logout) > int status; > waitpid(child_pid, &status, 0); > gdk_threads_add_idle(show_widget, widget); > > gdk_threads_add_idle(set_status_label_text, ""); > > logout(); > } else { > gdk_threads_add_idle(set_status_label_text, "Login error"); > } > gdk_threads_add_idle(set_password_entry_text, ""); > > return NULL; > } > > static gboolean key_event(GtkWidget *widget, GdkEventKey *event) { > if (event->keyval == ENTER_KEY) { > pthread_create(&login_thread, NULL, login_func, (void*) widget); > } else if (event->keyval == ESC_KEY) { > gtk_main_quit(); > } > return FALSE; > } > ``` > The problem is when the process I forked ends (the fork happens in the > `login` function, I see my display manager screen again but I can no longer > type in any of the text boxes. > > If there isn't anything obvious wrong in the above code, I'd appreciate it > if someone could run the display manager and take a look at what's wrong. > You can run it with Xephyr. I start Xephyr with the command `Xephyr -ac -br > -noreset -screen 800x600 :2 &` and then I run `DISPLAY=:2 ./display-manager > *`*. Note that when you log in, it executes the contents of ~/.xinitrc. > In my case, I have that set to `exec awesome`, and everything works fine. > > Any help would be appreciated. >
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