Use SIGUSR1/SIGUSR2 in slideshow mode to change images

ChangeLog

@@ -13,6 +13,7 @@ git HEAD
     * Draw a nice little message when in caption editing mode with empty
       caption (to indicate that caption editing is actually active)
     * caption mode: Automatically create caption directory if it doesn't exist
+    * Slideshow mode: SIGUSR1 = next image, SIGUSR2 = previous image
 
 Sat Jun  5 21:35:25 CEST 2010  Daniel Friesel <derf@chaosdorf.de
 

src/deps.mk

@@ -27,8 +27,10 @@ multiwindow.o: multiwindow.c feh.h structs.h menu.h ipc.h utils.h \
   getopt.h debug.h winwidget.h timers.h filelist.h options.h
 options.o: options.c feh.h structs.h menu.h ipc.h utils.h getopt.h \
   debug.h filelist.h options.h
+signals.o: signals.c feh.h structs.h menu.h ipc.h utils.h getopt.h \
+  debug.h winwidget.h
 slideshow.o: slideshow.c feh.h structs.h menu.h ipc.h utils.h getopt.h \
-  debug.h filelist.h timers.h winwidget.h options.h
+  debug.h filelist.h timers.h winwidget.h options.h signals.h
 support.o: support.c feh.h structs.h menu.h ipc.h utils.h getopt.h \
   debug.h filelist.h options.h support.h
 thumbnail.o: thumbnail.c feh.h structs.h menu.h ipc.h utils.h getopt.h \

src/signals.c

+/* signals.c
+
+Copyright (C) 2010 by Daniel Friesel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies of the Software and its documentation and acknowledgment shall be
+given in the documentation and software packages that this Software was
+used.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+#include "feh.h"
+#include "winwidget.h"
+
+void feh_handle_signal(int);
+
+void setup_signal_handlers()
+{
+	struct sigaction feh_sh;
+	sigset_t feh_ss;
+	D_ENTER(4);
+
+	sigemptyset(&feh_ss);
+	sigaddset(&feh_ss, SIGUSR1);
+	sigaddset(&feh_ss, SIGUSR2);
+
+	feh_sh.sa_handler = feh_handle_signal;
+	feh_sh.sa_mask = feh_ss;
+
+	sigaction(SIGUSR1, &feh_sh, NULL);
+	sigaction(SIGUSR2, &feh_sh, NULL);
+	D_RETURN_(4);
+}
+
+void feh_handle_signal(int signo)
+{
+	D_ENTER(4);
+	winwidget winwid
+		= winwidget_get_first_window_of_type(WIN_TYPE_SLIDESHOW);
+
+	if (winwid) {
+		if (signo == SIGUSR1)
+			slideshow_change_image(winwid, SLIDE_NEXT);
+		else if (signo == SIGUSR2)
+			slideshow_change_image(winwid, SLIDE_PREV);
+	}
+
+	D_RETURN_(4);
+}

src/signals.h

+/* signals.h
+
+Copyright (C) 2010 by Daniel Friesel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies of the Software and its documentation and acknowledgment shall be
+given in the documentation and software packages that this Software was
+used.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+*/
+
+#ifndef SIGNALS_H
+#define SIGNALS_H
+
+void setup_signal_handlers();
+
+#endif

src/slideshow.c

@@ -28,6 +28,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include "timers.h"
 #include "winwidget.h"
 #include "options.h"
+#include "signals.h"
 
 void init_slideshow_mode(void)
 {
@@ -75,6 +76,9 @@ void init_slideshow_mode(void)
 	}
 	if (!success)
 		show_mini_usage();
+
+	setup_signal_handlers();
+
 	D_RETURN_(3);
 }