Use SIGUSR1/SIGUSR2 in slideshow mode to change images

1 files changed, 63 insertions, 0 deletions

diff --git a/src/signals.c b/src/signals.c
new file mode 100644
index 0000000..4e51c77
--- /dev/null
+++ b/src/signals.c
@@ -0,0 +1,63 @@
+/* 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);
+}