Reload the current page on SIGUSR1 signal

Reloads the current page on all windows when the SIGUSR1 is received.
This is useful to update the page when it is being edited.

Fixes: #255

ChangeLog

@@ -26,6 +26,7 @@ dillo-3.2.0 [Not released yet]
  - Set focus_new_tab=NO and show_quit_dialog=NO by default.
  - Fix GET requests over HTTPS via a proxy.
  - Improve image resize logic to always try to preserve the aspect ratio.
+ - Reload current page on SIGUSR1 signal
    Patches: Rodrigo Arias Mallo
 +- Add primitive support for SVG using the nanosvg.h library.
  - Add support for ch, rem, vw, vh, vmin and vmax CSS units.

src/dillo.cc

@@ -2,6 +2,7 @@
  * Dillo web browser
  *
  * Copyright 1999-2007 Jorge Arellano Cid <[email protected]>
+ * Copyright 2024 Rodrigo Arias Mallo <[email protected]>
  *
  * 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
@@ -65,6 +66,8 @@
 #include "dw/textblock.hh"
 #include "dw/table.hh"
 
+static volatile sig_atomic_t sig_reload = 0;
+
 /**
  * Command line options structure
  */
@@ -145,6 +148,11 @@ static void raw_sigchld2(int signum)
    }
 }
 
+static void handler_usr1(int signum)
+{
+   sig_reload = 1;
+}
+
 /**
  * Establish SIGCHLD handler
  */
@@ -161,6 +169,11 @@ static void est_sigchld(void)
       perror("sigaction");
       exit(1);
    }
+
+   if (signal(SIGUSR1, handler_usr1) == SIG_ERR) {
+      perror("signal failed");
+      exit(1);
+   }
 }
 
 //----------------------------------------------------------------------------
@@ -580,7 +593,15 @@ int main(int argc, char **argv)
       }
    }
 
-   Fl::run();
+   /* Don't use, as it can be free()'d */
+   bw = NULL;
+
+   while (Fl::wait() > 0) {
+      if (sig_reload) {
+         sig_reload = 0;
+         a_UIcmd_reload_all_active();
+      }
+   }
 
    /*
     * Memory deallocating routines

src/uicmd.cc

@@ -69,6 +69,15 @@ using namespace dw::fltk;
  */
 static const char *save_dir = "";
 
+struct Tabgroup {
+   CustTabs *tabs;
+   struct Tabgroup *next;
+};
+
+/* An stack of CustTabs groups, each maps to one FLTK window. Points to
+ * the last one created. */
+static struct Tabgroup *tabgroups = NULL;
+
 /*
  * Forward declarations
  */
@@ -570,6 +579,13 @@ BrowserWindow *a_UIcmd_browser_window_new(int ww, int wh,
 
    win->box(FL_NO_BOX);
    CustTabs *DilloTabs = new CustTabs(ww, wh, prefs.ui_tab_height);
+
+   struct Tabgroup *tg = new Tabgroup;
+   tg->tabs = DilloTabs;
+   tg->next = tabgroups;
+   tabgroups = tg;
+   _MSG("new: tabgroups=%p\n", (void *) tg);
+
    win->end();
    win->resizable(DilloTabs->wizard());
 
@@ -668,8 +684,27 @@ void a_UIcmd_close_bw(void *vbw)
    delete(layout);
    if (tabs) {
       tabs->remove_tab(ui);
-      if (tabs->num_tabs() == 0)
+      if (tabs->num_tabs() == 0) {
+         /* No more tabs, remove tabgroup */
+         struct Tabgroup *tmp = tabgroups;
+         struct Tabgroup *prev = NULL;
+         for (tmp = tabgroups; tmp; tmp = tmp->next) {
+            if (tmp->tabs == tabs) {
+               if (prev)
+                  prev->next = tmp->next;
+               else
+                  tabgroups = tmp->next;
+               break;
+            }
+            prev = tmp;
+         }
+         if (tmp) {
+            _MSG("gone: tmp=%p tabgroups=%p\n", (void *) tmp, (void *) tabgroups);
+            free(tmp);
+         }
+
          delete tabs->window();
+      }
    }
    a_Bw_free(bw);
 }
@@ -873,6 +908,19 @@ void a_UIcmd_reload(void *vbw)
    a_Nav_reload((BrowserWindow*)vbw);
 }
 
+/*
+ * Reload all active tabs
+ */
+void a_UIcmd_reload_all_active()
+{
+   struct Tabgroup *tg = tabgroups;
+   for (tg = tabgroups; tg; tg = tg->next) {
+      BrowserWindow *bw = a_UIcmd_get_bw_by_widget(tg->tabs->wizard()->value());
+      if (bw)
+         a_UIcmd_reload(bw);
+   }
+}
+
 /*
  * Repush current URL
  */

src/uicmd.hh

@@ -37,6 +37,7 @@ void a_UIcmd_zoom_in(void *vbw);
 void a_UIcmd_zoom_out(void *vbw);
 void a_UIcmd_zoom_reset(void *vbw);
 void a_UIcmd_reload(void *vbw);
+void a_UIcmd_reload_all_active();
 void a_UIcmd_repush(void *vbw);
 void a_UIcmd_redirection0(void *vbw, const DilloUrl *url);
 void a_UIcmd_save(void *vbw);