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px4-firmware/apps/mavlink/mavlink.c

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/****************************************************************************
*
* Copyright (C) 2012 PX4 Development Team. All rights reserved.
* Author: Lorenz Meier <lm@inf.ethz.ch>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file mavlink.c
* MAVLink 1.0 protocol implementation.
*
* @author Lorenz Meier <lm@inf.ethz.ch>
*/
#include <nuttx/config.h>
#include <unistd.h>
#include <pthread.h>
#include <stdio.h>
#include <math.h>
#include <stdbool.h>
#include <fcntl.h>
#include <mqueue.h>
#include <string.h>
#include "mavlink_bridge_header.h"
#include <v1.0/common/mavlink.h>
#include <drivers/drv_hrt.h>
#include <time.h>
#include <float.h>
#include <unistd.h>
#include <nuttx/sched.h>
#include <sys/prctl.h>
#include <termios.h>
#include <errno.h>
#include <stdlib.h>
#include <poll.h>
#include <systemlib/param/param.h>
#include <systemlib/systemlib.h>
#include <systemlib/err.h>
#include "waypoints.h"
#include "mavlink_log.h"
#include "orb_topics.h"
#include "missionlib.h"
#include "mavlink_hil.h"
#include "util.h"
#include "waypoints.h"
#include "mavlink_parameters.h"
/* define MAVLink specific parameters */
PARAM_DEFINE_INT32(MAV_SYS_ID, 1);
PARAM_DEFINE_INT32(MAV_COMP_ID, 50);
PARAM_DEFINE_INT32(MAV_TYPE, MAV_TYPE_QUADROTOR);
__EXPORT int mavlink_main(int argc, char *argv[]);
static int mavlink_thread_main(int argc, char *argv[]);
/* thread state */
volatile bool thread_should_exit = false;
static volatile bool thread_running = false;
static int mavlink_task;
/* pthreads */
static pthread_t receive_thread;
static pthread_t uorb_receive_thread;
/* terminate MAVLink on user request - disabled by default */
static bool mavlink_link_termination_allowed = false;
mavlink_system_t mavlink_system = {
100,
50,
MAV_TYPE_QUADROTOR,
0,
0,
0
}; // System ID, 1-255, Component/Subsystem ID, 1-255
/* XXX not widely used */
uint8_t chan = MAVLINK_COMM_0;
/* XXX probably should be in a header... */
extern pthread_t receive_start(int uart);
/* Allocate storage space for waypoints */
static mavlink_wpm_storage wpm_s;
mavlink_wpm_storage *wpm = &wpm_s;
bool mavlink_hil_enabled = false;
/* protocol interface */
static int uart;
static int baudrate;
bool gcs_link = true;
/* interface mode */
static enum {
MAVLINK_INTERFACE_MODE_OFFBOARD,
MAVLINK_INTERFACE_MODE_ONBOARD
} mavlink_link_mode = MAVLINK_INTERFACE_MODE_OFFBOARD;
static struct mavlink_logbuffer lb;
static void mavlink_update_system(void);
static int mavlink_open_uart(int baudrate, const char *uart_name, struct termios *uart_config_original, bool *is_usb);
static void usage(void);
int set_mavlink_interval_limit(struct mavlink_subscriptions *subs, int mavlink_msg_id, int min_interval);
int
set_hil_on_off(bool hil_enabled)
{
int ret = OK;
/* Enable HIL */
if (hil_enabled && !mavlink_hil_enabled) {
/* Advertise topics */
pub_hil_attitude = orb_advertise(ORB_ID(vehicle_attitude), &hil_attitude);
pub_hil_global_pos = orb_advertise(ORB_ID(vehicle_global_position), &hil_global_pos);
mavlink_hil_enabled = true;
/* ramp up some HIL-related subscriptions */
unsigned hil_rate_interval;
if (baudrate < 19200) {
/* 10 Hz */
hil_rate_interval = 100;
} else if (baudrate < 38400) {
/* 10 Hz */
hil_rate_interval = 100;
} else if (baudrate < 115200) {
/* 20 Hz */
hil_rate_interval = 50;
} else {
/* 200 Hz */
hil_rate_interval = 5;
}
orb_set_interval(mavlink_subs.spa_sub, hil_rate_interval);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_SERVO_OUTPUT_RAW, hil_rate_interval);
}
if (!hil_enabled && mavlink_hil_enabled) {
mavlink_hil_enabled = false;
orb_set_interval(mavlink_subs.spa_sub, 200);
} else {
ret = ERROR;
}
return ret;
}
void
get_mavlink_mode_and_state(uint8_t *mavlink_state, uint8_t *mavlink_mode)
{
/* reset MAVLink mode bitfield */
*mavlink_mode = 0;
/* set mode flags independent of system state */
if (v_status.flag_control_manual_enabled) {
*mavlink_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED;
}
if (v_status.flag_hil_enabled) {
*mavlink_mode |= MAV_MODE_FLAG_HIL_ENABLED;
}
/* set arming state */
if (armed.armed) {
*mavlink_mode |= MAV_MODE_FLAG_SAFETY_ARMED;
} else {
*mavlink_mode &= ~MAV_MODE_FLAG_SAFETY_ARMED;
}
switch (v_status.state_machine) {
case SYSTEM_STATE_PREFLIGHT:
if (v_status.flag_preflight_gyro_calibration ||
v_status.flag_preflight_mag_calibration ||
v_status.flag_preflight_accel_calibration) {
*mavlink_state = MAV_STATE_CALIBRATING;
} else {
*mavlink_state = MAV_STATE_UNINIT;
}
break;
case SYSTEM_STATE_STANDBY:
*mavlink_state = MAV_STATE_STANDBY;
break;
case SYSTEM_STATE_GROUND_READY:
*mavlink_state = MAV_STATE_ACTIVE;
break;
case SYSTEM_STATE_MANUAL:
*mavlink_state = MAV_STATE_ACTIVE;
*mavlink_mode |= MAV_MODE_FLAG_MANUAL_INPUT_ENABLED;
break;
case SYSTEM_STATE_STABILIZED:
*mavlink_state = MAV_STATE_ACTIVE;
*mavlink_mode |= MAV_MODE_FLAG_STABILIZE_ENABLED;
break;
case SYSTEM_STATE_AUTO:
*mavlink_state = MAV_STATE_ACTIVE;
*mavlink_mode |= MAV_MODE_FLAG_GUIDED_ENABLED;
break;
case SYSTEM_STATE_MISSION_ABORT:
*mavlink_state = MAV_STATE_EMERGENCY;
break;
case SYSTEM_STATE_EMCY_LANDING:
*mavlink_state = MAV_STATE_EMERGENCY;
break;
case SYSTEM_STATE_EMCY_CUTOFF:
*mavlink_state = MAV_STATE_EMERGENCY;
break;
case SYSTEM_STATE_GROUND_ERROR:
*mavlink_state = MAV_STATE_EMERGENCY;
break;
case SYSTEM_STATE_REBOOT:
*mavlink_state = MAV_STATE_POWEROFF;
break;
}
}
int set_mavlink_interval_limit(struct mavlink_subscriptions *subs, int mavlink_msg_id, int min_interval)
{
int ret = OK;
switch (mavlink_msg_id) {
case MAVLINK_MSG_ID_SCALED_IMU:
/* sensor sub triggers scaled IMU */
orb_set_interval(subs->sensor_sub, min_interval);
break;
case MAVLINK_MSG_ID_HIGHRES_IMU:
/* sensor sub triggers highres IMU */
orb_set_interval(subs->sensor_sub, min_interval);
break;
case MAVLINK_MSG_ID_RAW_IMU:
/* sensor sub triggers RAW IMU */
orb_set_interval(subs->sensor_sub, min_interval);
break;
case MAVLINK_MSG_ID_ATTITUDE:
/* attitude sub triggers attitude */
orb_set_interval(subs->att_sub, min_interval);
break;
case MAVLINK_MSG_ID_SERVO_OUTPUT_RAW:
/* actuator_outputs triggers this message */
orb_set_interval(subs->act_0_sub, min_interval);
orb_set_interval(subs->act_1_sub, min_interval);
orb_set_interval(subs->act_2_sub, min_interval);
orb_set_interval(subs->act_3_sub, min_interval);
orb_set_interval(subs->actuators_sub, min_interval);
break;
case MAVLINK_MSG_ID_MANUAL_CONTROL:
/* manual_control_setpoint triggers this message */
orb_set_interval(subs->man_control_sp_sub, min_interval);
break;
case MAVLINK_MSG_ID_NAMED_VALUE_FLOAT:
orb_set_interval(subs->debug_key_value, min_interval);
break;
default:
/* not found */
ret = ERROR;
break;
}
return ret;
}
/****************************************************************************
* MAVLink text message logger
****************************************************************************/
static int mavlink_dev_ioctl(struct file *filep, int cmd, unsigned long arg);
static const struct file_operations mavlink_fops = {
.ioctl = mavlink_dev_ioctl
};
static int
mavlink_dev_ioctl(struct file *filep, int cmd, unsigned long arg)
{
static unsigned int total_counter = 0;
switch (cmd) {
case (int)MAVLINK_IOC_SEND_TEXT_INFO:
case (int)MAVLINK_IOC_SEND_TEXT_CRITICAL:
case (int)MAVLINK_IOC_SEND_TEXT_EMERGENCY: {
const char *txt = (const char *)arg;
struct mavlink_logmessage msg;
strncpy(msg.text, txt, sizeof(msg.text));
mavlink_logbuffer_write(&lb, &msg);
total_counter++;
return OK;
}
default:
return ENOTTY;
}
}
#define MAVLINK_OFFBOARD_CONTROL_FLAG_ARMED 0x10
/****************************************************************************
* Public Functions
****************************************************************************/
int mavlink_open_uart(int baud, const char *uart_name, struct termios *uart_config_original, bool *is_usb)
{
/* process baud rate */
int speed;
switch (baud) {
case 0: speed = B0; break;
case 50: speed = B50; break;
case 75: speed = B75; break;
case 110: speed = B110; break;
case 134: speed = B134; break;
case 150: speed = B150; break;
case 200: speed = B200; break;
case 300: speed = B300; break;
case 600: speed = B600; break;
case 1200: speed = B1200; break;
case 1800: speed = B1800; break;
case 2400: speed = B2400; break;
case 4800: speed = B4800; break;
case 9600: speed = B9600; break;
case 19200: speed = B19200; break;
case 38400: speed = B38400; break;
case 57600: speed = B57600; break;
case 115200: speed = B115200; break;
case 230400: speed = B230400; break;
case 460800: speed = B460800; break;
case 921600: speed = B921600; break;
default:
fprintf(stderr, "[mavlink] ERROR: Unsupported baudrate: %d\n\tsupported examples:\n\n\t9600\n19200\n38400\n57600\n115200\n230400\n460800\n921600\n\n", baud);
return -EINVAL;
}
/* open uart */
printf("[mavlink] UART is %s, baudrate is %d\n", uart_name, baud);
uart = open(uart_name, O_RDWR | O_NOCTTY);
/* Try to set baud rate */
struct termios uart_config;
int termios_state;
*is_usb = false;
if (strcmp(uart_name, "/dev/ttyACM0") != OK) {
/* Back up the original uart configuration to restore it after exit */
if ((termios_state = tcgetattr(uart, uart_config_original)) < 0) {
fprintf(stderr, "[mavlink] ERROR getting baudrate / termios config for %s: %d\n", uart_name, termios_state);
close(uart);
return -1;
}
/* Fill the struct for the new configuration */
tcgetattr(uart, &uart_config);
/* Clear ONLCR flag (which appends a CR for every LF) */
uart_config.c_oflag &= ~ONLCR;
/* Set baud rate */
if (cfsetispeed(&uart_config, speed) < 0 || cfsetospeed(&uart_config, speed) < 0) {
fprintf(stderr, "[mavlink] ERROR setting baudrate / termios config for %s: %d (cfsetispeed, cfsetospeed)\n", uart_name, termios_state);
close(uart);
return -1;
}
if ((termios_state = tcsetattr(uart, TCSANOW, &uart_config)) < 0) {
fprintf(stderr, "[mavlink] ERROR setting baudrate / termios config for %s (tcsetattr)\n", uart_name);
close(uart);
return -1;
}
} else {
*is_usb = true;
}
return uart;
}
void
mavlink_send_uart_bytes(mavlink_channel_t channel, uint8_t *ch, int length)
{
write(uart, ch, (size_t)(sizeof(uint8_t) * length));
}
/*
* Internal function to give access to the channel status for each channel
*/
mavlink_status_t* mavlink_get_channel_status(uint8_t channel)
{
static mavlink_status_t m_mavlink_status[MAVLINK_COMM_NUM_BUFFERS];
return &m_mavlink_status[channel];
}
/*
* Internal function to give access to the channel buffer for each channel
*/
mavlink_message_t* mavlink_get_channel_buffer(uint8_t channel)
{
static mavlink_message_t m_mavlink_buffer[MAVLINK_COMM_NUM_BUFFERS];
return &m_mavlink_buffer[channel];
}
void mavlink_update_system(void)
{
static bool initialized = false;
param_t param_system_id;
param_t param_component_id;
param_t param_system_type;
if (!initialized) {
param_system_id = param_find("MAV_SYS_ID");
param_component_id = param_find("MAV_COMP_ID");
param_system_type = param_find("MAV_TYPE");
}
/* update system and component id */
int32_t system_id;
param_get(param_system_id, &system_id);
if (system_id > 0 && system_id < 255) {
mavlink_system.sysid = system_id;
}
int32_t component_id;
param_get(param_component_id, &component_id);
if (component_id > 0 && component_id < 255) {
mavlink_system.compid = component_id;
}
int32_t system_type;
param_get(param_system_type, &system_type);
if (system_type >= 0 && system_type < MAV_TYPE_ENUM_END) {
mavlink_system.type = system_type;
}
}
/**
* MAVLink Protocol main function.
*/
int mavlink_thread_main(int argc, char *argv[])
{
/* initialize mavlink text message buffering */
mavlink_logbuffer_init(&lb, 5);
int ch;
char *device_name = "/dev/ttyS1";
baudrate = 57600;
/* work around some stupidity in task_create's argv handling */
argc -= 2;
argv += 2;
while ((ch = getopt(argc, argv, "b:d:eo")) != EOF) {
switch (ch) {
case 'b':
baudrate = strtoul(optarg, NULL, 10);
if (baudrate == 0)
errx(1, "invalid baud rate '%s'", optarg);
break;
case 'd':
device_name = optarg;
break;
case 'e':
mavlink_link_termination_allowed = true;
break;
case 'o':
mavlink_link_mode = MAVLINK_INTERFACE_MODE_ONBOARD;
break;
default:
usage();
}
}
struct termios uart_config_original;
bool usb_uart;
/* print welcome text */
warnx("MAVLink v1.0 serial interface starting...");
/* inform about mode */
warnx((mavlink_link_mode == MAVLINK_INTERFACE_MODE_ONBOARD) ? "ONBOARD MODE" : "DOWNLINK MODE");
/* Flush stdout in case MAVLink is about to take it over */
fflush(stdout);
/* default values for arguments */
uart = mavlink_open_uart(baudrate, device_name, &uart_config_original, &usb_uart);
if (uart < 0)
err(1, "could not open %s", device_name);
/* create the device node that's used for sending text log messages, etc. */
register_driver(MAVLINK_LOG_DEVICE, &mavlink_fops, 0666, NULL);
/* Initialize system properties */
mavlink_update_system();
/* start the MAVLink receiver */
receive_thread = receive_start(uart);
/* start the ORB receiver */
uorb_receive_thread = uorb_receive_start();
/* initialize waypoint manager */
mavlink_wpm_init(wpm);
/* all subscriptions are now active, set up initial guess about rate limits */
if (baudrate >= 230400) {
/* 200 Hz / 5 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_HIGHRES_IMU, 20);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_RAW_IMU, 20);
/* 50 Hz / 20 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_ATTITUDE, 30);
/* 20 Hz / 50 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_NAMED_VALUE_FLOAT, 10);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_SERVO_OUTPUT_RAW, 50);
/* 2 Hz */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_MANUAL_CONTROL, 100);
} else if (baudrate >= 115200) {
/* 20 Hz / 50 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_HIGHRES_IMU, 50);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_RAW_IMU, 50);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_ATTITUDE, 50);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_NAMED_VALUE_FLOAT, 50);
/* 5 Hz / 100 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_SERVO_OUTPUT_RAW, 200);
/* 2 Hz */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_MANUAL_CONTROL, 500);
} else if (baudrate >= 57600) {
/* 10 Hz / 100 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_RAW_IMU, 300);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_HIGHRES_IMU, 300);
/* 10 Hz / 100 ms ATTITUDE */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_ATTITUDE, 200);
/* 5 Hz / 200 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_NAMED_VALUE_FLOAT, 200);
/* 5 Hz / 200 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_SERVO_OUTPUT_RAW, 500);
/* 2 Hz */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_MANUAL_CONTROL, 500);
} else {
/* very low baud rate, limit to 1 Hz / 1000 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_RAW_IMU, 1000);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_ATTITUDE, 1000);
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_HIGHRES_IMU, 1000);
/* 1 Hz / 1000 ms */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_NAMED_VALUE_FLOAT, 1000);
/* 0.5 Hz */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_SERVO_OUTPUT_RAW, 2000);
/* 0.1 Hz */
set_mavlink_interval_limit(&mavlink_subs, MAVLINK_MSG_ID_MANUAL_CONTROL, 10000);
}
thread_running = true;
/* arm counter to go off immediately */
unsigned lowspeed_counter = 10;
while (!thread_should_exit) {
/* 1 Hz */
if (lowspeed_counter == 10) {
mavlink_update_system();
/* translate the current system state to mavlink state and mode */
uint8_t mavlink_state = 0;
uint8_t mavlink_mode = 0;
get_mavlink_mode_and_state(&mavlink_state, &mavlink_mode);
/* send heartbeat */
mavlink_msg_heartbeat_send(chan, mavlink_system.type, MAV_AUTOPILOT_PX4, mavlink_mode, v_status.state_machine, mavlink_state);
/* switch HIL mode if required */
set_hil_on_off(v_status.flag_hil_enabled);
/* send status (values already copied in the section above) */
mavlink_msg_sys_status_send(chan,
v_status.onboard_control_sensors_present,
v_status.onboard_control_sensors_enabled,
v_status.onboard_control_sensors_health,
v_status.load,
v_status.voltage_battery * 1000.0f,
v_status.current_battery * 1000.0f,
v_status.battery_remaining,
v_status.drop_rate_comm,
v_status.errors_comm,
v_status.errors_count1,
v_status.errors_count2,
v_status.errors_count3,
v_status.errors_count4);
lowspeed_counter = 0;
}
lowspeed_counter++;
/* sleep quarter the time */
usleep(25000);
/* check if waypoint has been reached against the last positions */
mavlink_waypoint_eventloop(mavlink_missionlib_get_system_timestamp(), &global_pos, &local_pos);
/* sleep quarter the time */
usleep(25000);
/* send parameters at 20 Hz (if queued for sending) */
mavlink_pm_queued_send();
/* sleep quarter the time */
usleep(25000);
if (baudrate > 57600) {
mavlink_pm_queued_send();
}
/* sleep 10 ms */
usleep(10000);
/* send one string at 10 Hz */
if (!mavlink_logbuffer_is_empty(&lb)) {
struct mavlink_logmessage msg;
int lb_ret = mavlink_logbuffer_read(&lb, &msg);
if (lb_ret == OK) {
mavlink_missionlib_send_gcs_string(msg.text);
}
}
/* sleep 15 ms */
usleep(15000);
}
/* wait for threads to complete */
pthread_join(receive_thread, NULL);
pthread_join(uorb_receive_thread, NULL);
/* Reset the UART flags to original state */
if (!usb_uart)
tcsetattr(uart, TCSANOW, &uart_config_original);
thread_running = false;
exit(0);
}
static void
usage()
{
fprintf(stderr, "usage: mavlink start [-d <devicename>] [-b <baud rate>]\n"
" mavlink stop\n"
" mavlink status\n");
exit(1);
}
int mavlink_main(int argc, char *argv[])
{
if (argc < 2) {
warnx("missing command");
usage();
}
if (!strcmp(argv[1], "start")) {
/* this is not an error */
if (thread_running)
errx(0, "mavlink already running\n");
thread_should_exit = false;
mavlink_task = task_spawn("mavlink",
SCHED_DEFAULT,
SCHED_PRIORITY_DEFAULT,
2048,
mavlink_thread_main,
(const char**)argv);
exit(0);
}
if (!strcmp(argv[1], "stop")) {
thread_should_exit = true;
while (thread_running) {
usleep(200000);
}
warnx("terminated.");
exit(0);
}
if (!strcmp(argv[1], "status")) {
if (thread_running) {
errx(0, "running");
} else {
errx(1, "not running");
}
}
warnx("unrecognized command");
usage();
/* not getting here */
return 0;
}
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