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leds_main.c
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leds_main.c
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/****************************************************************************
* apps/examples/leds/leds_main.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/ioctl.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <sched.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <nuttx/leds/userled.h>
/****************************************************************************
* Private Data
****************************************************************************/
static bool g_led_daemon_started;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sigterm_action
****************************************************************************/
static void sigterm_action(int signo, siginfo_t *siginfo, void *arg)
{
if (signo == SIGTERM)
{
printf("SIGTERM received\n");
g_led_daemon_started = false;
printf("led_daemon: Terminated.\n");
}
else
{
printf("\nsigterm_action: Received signo=%d siginfo=%p arg=%p\n",
signo, siginfo, arg);
}
}
/****************************************************************************
* Name: led_daemon
****************************************************************************/
static int led_daemon(int argc, char *argv[])
{
userled_set_t supported;
userled_set_t ledset;
bool incrementing;
int ret;
int fd;
pid_t mypid;
struct sigaction act;
/* SIGTERM handler */
memset(&act, 0, sizeof(struct sigaction));
act.sa_sigaction = sigterm_action;
act.sa_flags = SA_SIGINFO;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGTERM);
ret = sigaction(SIGTERM, &act, NULL);
if (ret != 0)
{
fprintf(stderr, "Failed to install SIGTERM handler, errno=%d\n",
errno);
return (EXIT_FAILURE + 1);
}
/* Indicate that we are running */
mypid = getpid();
g_led_daemon_started = true;
printf("\nled_daemon (pid# %d): Running\n", mypid);
/* Open the LED driver */
printf("led_daemon: Opening %s\n", CONFIG_EXAMPLES_LEDS_DEVPATH);
fd = open(CONFIG_EXAMPLES_LEDS_DEVPATH, O_WRONLY);
if (fd < 0)
{
int errcode = errno;
printf("led_daemon: ERROR: Failed to open %s: %d\n",
CONFIG_EXAMPLES_LEDS_DEVPATH, errcode);
goto errout;
}
/* Get the set of LEDs supported */
ret = ioctl(fd, ULEDIOC_SUPPORTED,
(unsigned long)((uintptr_t)&supported));
if (ret < 0)
{
int errcode = errno;
printf("led_daemon: ERROR: ioctl(ULEDIOC_SUPPORTED) failed: %d\n",
errcode);
goto errout_with_fd;
}
/* Excluded any LEDs that not supported AND not in the set of LEDs the
* user asked us to use.
*/
printf("led_daemon: Supported LEDs 0x%02x\n", (unsigned int)supported);
supported &= CONFIG_EXAMPLES_LEDS_LEDSET;
/* Now loop forever, changing the LED set */
ledset = 0;
incrementing = true;
while (g_led_daemon_started == true)
{
userled_set_t newset;
userled_set_t tmp;
if (incrementing)
{
tmp = ledset;
do
{
tmp++;
newset = tmp & supported;
}
while (newset == ledset);
/* REVISIT: There are flaws in this logic. It would not work
* correctly if there were spaces in the supported mask.
*/
if (newset == 0)
{
incrementing = false;
continue;
}
}
else
{
/* REVISIT: There are flaws in this logic. It would not work
* correctly if there were spaces in the supported mask.
*/
if (ledset == 0)
{
incrementing = true;
continue;
}
tmp = ledset;
do
{
tmp--;
newset = tmp & supported;
}
while (newset == ledset);
}
ledset = newset;
printf("led_daemon: LED set 0x%02x\n", (unsigned int)ledset);
ret = ioctl(fd, ULEDIOC_SETALL, ledset);
if (ret < 0)
{
int errcode = errno;
printf("led_daemon: ERROR: ioctl(ULEDIOC_SUPPORTED) failed: %d\n",
errcode);
goto errout_with_fd;
}
usleep(500 * 1000L);
}
/* treats signal termination of the task
* task terminated by a SIGTERM
*/
exit(EXIT_SUCCESS);
errout_with_fd:
close(fd);
errout:
g_led_daemon_started = false;
printf("led_daemon: Terminating\n");
return EXIT_FAILURE;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* leds_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
int ret;
printf("leds_main: Starting the led_daemon\n");
if (g_led_daemon_started)
{
printf("leds_main: led_daemon already running\n");
return EXIT_SUCCESS;
}
// TODO: task_create missing from QEMU knsh64
// ret = task_create("led_daemon", CONFIG_EXAMPLES_LEDS_PRIORITY,
// CONFIG_EXAMPLES_LEDS_STACKSIZE, led_daemon,
// NULL);
ret = led_daemon(argc, argv); ////
if (ret < 0)
{
int errcode = errno;
printf("leds_main: ERROR: Failed to start led_daemon: %d\n",
errcode);
return EXIT_FAILURE;
}
printf("leds_main: led_daemon started\n");
return EXIT_SUCCESS;
}