1 files changed, 94 insertions, 0 deletions
diff --git a/src/signals.c b/src/signals.c
new file mode 100644
index 0000000..058b8c9
--- /dev/null
+++ b/src/signals.c
@@ -0,0 +1,94 @@
+/* signals.c
+
+Copyright (C) 2010-2023 by Birte Kristina 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 "filelist.h"
+#include "winwidget.h"
+#include "options.h"
+
+void feh_handle_signal(int);
+volatile int sig_received = 0;
+volatile int sig_exit = 0;
+
+void setup_signal_handlers(void)
+{
+	struct sigaction feh_sh;
+	sigset_t feh_ss;
+	if (
+		(sigemptyset(&feh_ss) == -1) ||
+		(sigaddset(&feh_ss, SIGUSR1) == -1) ||
+		(sigaddset(&feh_ss, SIGUSR2) == -1) ||
+		(sigaddset(&feh_ss, SIGALRM) == -1) ||
+		(sigaddset(&feh_ss, SIGTERM) == -1) ||
+		(sigaddset(&feh_ss, SIGQUIT) == -1) ||
+		(sigaddset(&feh_ss, SIGINT) == -1) ||
+		(sigaddset(&feh_ss, SIGTTIN) == -1))
+	{
+		weprintf("Failed to set up signal masks");
+		return;
+	}
+
+	feh_sh.sa_handler = feh_handle_signal;
+	feh_sh.sa_mask    = feh_ss;
+	feh_sh.sa_flags   = 0;
+
+	if (
+		(sigaction(SIGUSR1, &feh_sh, NULL) == -1) ||
+		(sigaction(SIGUSR2, &feh_sh, NULL) == -1) ||
+		(sigaction(SIGALRM, &feh_sh, NULL) == -1) ||
+		(sigaction(SIGTERM, &feh_sh, NULL) == -1) ||
+		(sigaction(SIGQUIT, &feh_sh, NULL) == -1) ||
+		(sigaction(SIGINT, &feh_sh, NULL) == -1) ||
+		(sigaction(SIGTTIN, &feh_sh, NULL) == -1))
+	{
+		weprintf("Failed to set up signal handler");
+		return;
+	}
+
+	return;
+}
+
+void feh_handle_signal(int signo)
+{
+	switch (signo) {
+		case SIGALRM:
+			if (childpid)
+				killpg(childpid, SIGINT);
+			return;
+		case SIGTTIN:
+			// we were probably backgrounded while we were running
+			control_via_stdin = 0;
+			return;
+		case SIGINT:
+		case SIGTERM:
+		case SIGQUIT:
+			if (childpid)
+				killpg(childpid, SIGINT);
+			sig_exit = 128 + signo;
+			return;
+	}
+
+	sig_received = signo;
+}