xdg-screensaver plugin

configure.ac

@@ -3671,6 +3671,7 @@ AS_IF([test "${enable_xcb}" != "no"], [
   VLC_ADD_PLUGIN([globalhotkeys])
   VLC_ADD_CFLAGS([globalhotkeys],[${XCB_KEYSYMS_CFLAGS} ${XCB_CFLAGS}] )
   VLC_ADD_LIBS([globalhotkeys],[${XCB_KEYSYMS_LIBS} ${XCB_LIBS}] )
+  VLC_ADD_PLUGIN([xdg_screensaver])
 ])
 
 

modules/misc/Modules.am

@@ -19,6 +19,7 @@ SOURCES_gnutls = gnutls.c dhparams.h
 SOURCES_svg = svg.c
 SOURCES_audioscrobbler = audioscrobbler.c
 SOURCES_inhibit = inhibit.c
+SOURCES_xdg_screensaver = xdg-screensaver.c
 
 libvlc_LTLIBRARIES += \
 	liblogger_plugin.la

modules/misc/xdg-screensaver.c

+/*****************************************************************************
+ * xdg-screensaver.c
+ *****************************************************************************
+ * Copyright (C) 2008 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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 Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_inhibit.h>
+#include <spawn.h>
+#include <sys/wait.h>
+
+static int Open (vlc_object_t *);
+static void Close (vlc_object_t *);
+
+vlc_module_begin ()
+    set_shortname ("XDG-screensaver" )
+    set_description (N_("XDG screen saver inhibition") )
+    set_capability ("inhibit", 10 )
+    set_callbacks (Open, Close)
+    set_category (CAT_ADVANCED)
+    set_subcategory (SUBCAT_ADVANCED_MISC)
+vlc_module_end ()
+
+struct vlc_inhibit_sys
+{
+    pid_t pid;
+    char id[11];
+};
+
+static void Inhibit (vlc_inhibit_t *ih, bool suspend);
+
+static int Open (vlc_object_t *obj)
+{
+    vlc_inhibit_t *ih = (vlc_inhibit_t *)obj;
+    vlc_inhibit_sys_t *p_sys = malloc (sizeof (*p_sys));
+    if (p_sys == NULL)
+        return VLC_ENOMEM;
+
+    ih->p_sys = p_sys;
+    ih->inhibit = Inhibit;
+
+    p_sys->pid = 0;
+    snprintf (p_sys->id, sizeof (p_sys->id), "0x%08"PRIx32, ih->window_id);
+
+    return VLC_SUCCESS;
+}
+
+static void Close (vlc_object_t *obj)
+{
+    vlc_inhibit_t *ih = (vlc_inhibit_t *)obj;
+    vlc_inhibit_sys_t *p_sys = ih->p_sys;
+
+    if (p_sys->pid)
+    {
+        int status;
+
+        while (waitpid (p_sys->pid, &status, 0) == -1);
+    }
+    free (p_sys);
+}
+
+static void Inhibit (vlc_inhibit_t *ih, bool suspend)
+{
+    vlc_inhibit_sys_t *p_sys = ih->p_sys;
+    pid_t pid;
+
+    /* xdg-screensaver can take quite a while to start up (e.g. 1 second).
+     * So we avoid _waiting_ for it unless we really need to (clean up). */
+    /* TODO: it would be even faster to cache the current state, and
+     * wait in a separate thread until the target state is reached. */
+    if (p_sys->pid)
+    {
+        int status;
+
+        while (waitpid (p_sys->pid, &status, 0) == -1);
+        p_sys->pid = 0;
+    }
+
+    char *argv[4] = {
+        (char *)"xdg-screensaver",
+        suspend ? (char *)"suspend" : (char *)"resume",
+        p_sys->id,
+        NULL,
+    };
+    if (posix_spawnp (&pid, "xdg-screensaver", NULL, NULL, argv, environ) == 0)
+    {
+        msg_Dbg (ih, "started xdg-screensaver (PID = %d)", (int)pid);
+        ih->p_sys->pid = pid;
+    }
+    else
+        msg_Warn (ih, "could not start xdg-screensaver");
+}