aws iot sample: application with basic signal handling

https://jira.digi.com/browse/DEL-4149

Signed-off-by: Tatiana Leon <tatiana.leon@digi.com>

awsiot-sample/Makefile

@@ -0,0 +1,49 @@
+# ***************************************************************************
+# Copyright (c) 2017 Digi International Inc.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+# OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+# PERFORMANCE OF THIS SOFTWARE.
+#
+# Digi International Inc. 11001 Bren Road East, Minnetonka, MN 55343
+#
+# ***************************************************************************
+EXECUTABLE = awsiot-sample
+
+SRC = src
+
+CFLAGS += -Wall
+CFLAGS += $(LOG_FLAGS)
+CFLAGS += -DGIT_REVISION=\"$(if $(GIT_REVISION),-g$(GIT_REVISION))\"
+
+CFLAGS += $(shell pkg-config --cflags awsiotsdk)
+LDLIBS += $(shell pkg-config --libs --static awsiotsdk)
+
+SRCS = $(wildcard $(SRC)/*.c)
+OBJS = $(SRCS:.c=.o)
+
+.PHONY: all
+all:  $(EXECUTABLE)
+
+$(EXECUTABLE): $(OBJS)
+	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@
+
+.PHONY: install
+install: $(EXECUTABLE)
+	install -d $(DESTDIR)/usr/bin
+	install -m 0755 $(EXECUTABLE) $(DESTDIR)/usr/bin/
+	install -d $(DESTDIR)/etc
+	install -m 0644 cfg_files/*.conf $(DESTDIR)/etc/
+
+.PHONY: clean
+clean:
+	-rm -f $(EXECUTABLE) $(OBJS)
+

awsiot-sample/README.md

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+AWS IoT device SDK Demo Application
+===================================
+Demo application to connect devices to AWS IoT.
+
+License
+-------
+Copyright 2017, Digi International Inc.
+
+This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0. If a copy of the MPL was not distributed with this
+file, you can obtain one at http://mozilla.org/MPL/2.0/.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+

awsiot-sample/src/main.c

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+/*
+ * Copyright (c) 2017 Digi International Inc.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Digi International Inc. 11001 Bren Road East, Minnetonka, MN 55343
+ * =======================================================================
+ */
+
+#include <aws_iot_log.h>
+#include <signal.h>
+#include <unistd.h>
+
+/*------------------------------------------------------------------------------
+                    F U N C T I O N  D E C L A R A T I O N S
+------------------------------------------------------------------------------*/
+static int check_stop(void);
+static void add_sigkill_signal(void);
+static void graceful_shutdown(void);
+static void sigint_handler(int signum);
+
+/*------------------------------------------------------------------------------
+                         G L O B A L  V A R I A B L E S
+------------------------------------------------------------------------------*/
+static volatile int stop = 0;
+
+/*------------------------------------------------------------------------------
+                     F U N C T I O N  D E F I N I T I O N S
+------------------------------------------------------------------------------*/
+int main(int argc, char **argv)
+{
+	int result = EXIT_SUCCESS;
+
+	add_sigkill_signal();
+
+	do {
+		sleep(1);
+	} while (!check_stop());
+
+	return result;
+}
+
+/*
+ * check_stop() - Stop application
+ *
+ * Return: 1 if it is successfully stopped, 0 otherwise.
+ */
+static int check_stop(void)
+{
+	return stop;
+}
+
+/*
+ * add_sigkill_signal() - Add the kill signal to the process
+ */
+static void add_sigkill_signal(void)
+{
+	struct sigaction new_action;
+	struct sigaction old_action;
+
+	/* Setup signal hander. */
+	atexit(graceful_shutdown);
+	new_action.sa_handler = sigint_handler;
+	sigemptyset(&new_action.sa_mask);
+	new_action.sa_flags = 0;
+	sigaction(SIGINT, NULL, &old_action);
+	if (old_action.sa_handler != SIG_IGN)
+		sigaction(SIGINT, &new_action, NULL);
+}
+
+/*
+ * graceful_shutdown() - Stop MQTT connection and all threads
+ */
+void graceful_shutdown(void)
+{
+	stop = 1;
+	check_stop();
+}
+
+/**
+ * sigint_handler() - Manage signal received.
+ *
+ * @signum: Received signal.
+ */
+static void sigint_handler(int signum)
+{
+	IOT_DEBUG("Received signal %d to close Cloud connection.", signum);
+	exit(0);
+}