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#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include "anzeige.h"
#include "fonts.h"
#include "input_gadgets.h"
#include "multiplexer.h"
void drop_privileges();
void handle_signals(int signo);
t_scroll_data scroll_data;
t_input_thread input_threads[THREAD_IDX_MAX];
int main(int argc, char **argv)
{
int ret_val;
memset(&scroll_data, 0, sizeof(t_scroll_data));
memset(&input_threads, 0, sizeof(t_input_thread) * THREAD_IDX_MAX);
// Set up gpi pointer for direct register access
ret_val = multiplexer_setup_root();
if (ret_val)
return ret_val;
// Drop root privileges
drop_privileges();
// set up / register signal handler
struct sigaction new_action, old_action;
new_action.sa_handler = handle_signals;
sigemptyset (&new_action.sa_mask);
new_action.sa_flags = 0;
const int fetch_signals[4] = {
SIGINT, SIGHUP, SIGTERM, SIGUSR1
};
for (int i = 0; i < sizeof(fetch_signals)/sizeof(fetch_signals[0]); i++) {
sigaction (fetch_signals[i], NULL, &old_action);
if (old_action.sa_handler != SIG_IGN)
sigaction (fetch_signals[i], &new_action, NULL);
}
init_symbols_boundaries();
/************************************************************************\
* You are about to change the GPIO settings of your computer. *
* Mess this up and it will stop working! *
* It might be a good idea to 'sync' before running this program *
* so at least you still have your code changes written to the SD-card! *
\************************************************************************/
// configure the gpio pins and start the multiplexer thread
multiplexer_setup_scroll(&scroll_data);
#define TEXT_BUFFER_LENGTH SCROLL_BUF_LEN / 5
char *text_buffer;
char *text_buffer_end;
char text_buffers[OUTPUT_IDX_MAX][MAX_TEXT_OUTPUT_LEN];
char output_text_buffer[MAX_TEXT_OUTPUT_LEN];
char humidity_text_buffer[MAX_TEXT_OUTPUT_LEN];
double outside_temperature = 0, outside_humidity = 0, inside_temperature = 0, inside_humidity = 0;
int updated = 0;
memset(humidity_text_buffer, 0 ,MAX_TEXT_OUTPUT_LEN);
text_buffer = malloc(TEXT_BUFFER_LENGTH);
if (text_buffer == NULL) {
fprintf(stderr, "malloc failed to allocate %d bytes\n", TEXT_BUFFER_LENGTH);
turn_off_display();
return EXIT_FAILURE;
}
memset(text_buffer, 0, TEXT_BUFFER_LENGTH);
memset(text_buffers, 0, OUTPUT_IDX_MAX * MAX_TEXT_OUTPUT_LEN);
memset(output_text_buffer, 0, MAX_TEXT_OUTPUT_LEN);
for (int i=0; i<THREAD_IDX_MAX; i++) {
input_threads[i].keep_running = 1;
input_threads[i].last_update = 0;
}
pthread_create(&input_threads[THREAD_IDX_WARNINGS].thread_id, NULL, gadgets_watch_weather_warnings, &input_threads[THREAD_IDX_WARNINGS]);
pthread_create(&input_threads[THREAD_IDX_OUTSIDE].thread_id, NULL, gadgets_watch_current_temperature, &input_threads[THREAD_IDX_OUTSIDE]);
pthread_create(&input_threads[THREAD_IDX_FORECAST].thread_id, NULL, gadgets_watch_weather_forecast, &input_threads[THREAD_IDX_FORECAST]);
pthread_create(&input_threads[THREAD_IDX_INSIDE].thread_id, NULL, gadgets_watch_humidity, &input_threads[THREAD_IDX_INSIDE]);
scroll_data . shine_until = time(NULL) + 10;
while (scroll_data . keep_running) {
if (got_input()) {
scroll_data . shine_until = time(NULL) + 60;
for (int i=0; i<THREAD_IDX_MAX; i++)
input_threads[i].force_update = 1;
}
for (int i=0; i<THREAD_IDX_MAX; i++) {
int outdated = (input_threads[i].last_update < time(NULL) - 3600);
if (input_threads[i].output_ready || outdated) {
if (outdated)
snprintf(output_text_buffer, MAX_TEXT_OUTPUT_LEN, "%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c", 0xEE, 0x01, 0xEE, 0x02, 0xEE, 0x01, 0xEE, 0x02, 0xEE, 0x05, 0xEE, 0x06, 0xEE, 0x05, 0xEE, 0x06);
else
strncpy(output_text_buffer, input_threads[i].text_output, MAX_TEXT_OUTPUT_LEN);
if (strcmp(text_buffers[i], output_text_buffer)) {
strncpy(text_buffers[i], output_text_buffer, MAX_TEXT_OUTPUT_LEN);
updated = 1;
}
if ((i == THREAD_IDX_OUTSIDE) || (i == THREAD_IDX_INSIDE)) {
if (outdated) {
snprintf(humidity_text_buffer, MAX_TEXT_OUTPUT_LEN, "%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c", 0xEE, 0x01, 0xEE, 0x02, 0xEE, 0x01, 0xEE, 0x02, 0xEE, 0x05, 0xEE, 0x06, 0xEE, 0x05, 0xEE, 0x06);
} else {
if (i == THREAD_IDX_OUTSIDE) {
if (outside_temperature != input_threads[i].double_output[0])
outside_temperature = input_threads[i].double_output[0];
if (outside_humidity != input_threads[i].double_output[1])
outside_humidity = input_threads[i].double_output[1];
}
if (i == THREAD_IDX_INSIDE) {
if (inside_temperature != input_threads[i].double_output[0])
inside_temperature = input_threads[i].double_output[0];
if (inside_humidity != input_threads[i].double_output[1])
inside_humidity = input_threads[i].double_output[1];
}
if (((outside_temperature!=0) || (outside_humidity!=0)) &&
((inside_temperature!=0) || (inside_humidity!=0))) {
gadgets_calculate_humidity_level(
humidity_text_buffer,
MAX_TEXT_OUTPUT_LEN,
outside_temperature,
outside_humidity,
inside_temperature,
inside_humidity
);
}
}
if (strcmp(text_buffers[THREAD_IDX_INSIDE], humidity_text_buffer)) {
strncpy(text_buffers[THREAD_IDX_INSIDE], humidity_text_buffer, MAX_TEXT_OUTPUT_LEN);
updated = 1;
}
}
input_threads[i].output_ready = 0;
}
}
if (updated)
updated ++;
if (updated > 15) {
updated = 0;
memset(text_buffer, 0, TEXT_BUFFER_LENGTH);
text_buffer_end = text_buffer;
for (int i=0; i<OUTPUT_IDX_MAX; i++) {
if ((text_buffer + TEXT_BUFFER_LENGTH - text_buffer_end > 0) && (*text_buffers[i]))
text_buffer_end += snprintf(
text_buffer_end,
text_buffer + TEXT_BUFFER_LENGTH - text_buffer_end,
"%s; ",
text_buffers[i]
);
}
struct tm time_struct;
time_t now;
memset(&time_struct, 0, sizeof(time_struct));
now = time(NULL);
localtime_r(&now, &time_struct);
for (int i = 0; i < (time_struct . tm_wday + 6) % 7 + 1; i++) {
if (text_buffer + TEXT_BUFFER_LENGTH - text_buffer_end <= 0)
break;
text_buffer_end += snprintf(
text_buffer_end,
text_buffer + TEXT_BUFFER_LENGTH - text_buffer_end,
"%c%c%c%c",
0xEE,
i==0 ? 0x01 : 0x03 + 2 * (i & 0x01),
0xEE,
i==0 ? 0x02 : 0x04 + 2 * (i & 0x01)
);
}
scroll_data . input_len =
render(
text_buffer,
text_buffer_end - text_buffer,
scroll_data . input,
sizeof(scroll_data . input),
1
);
scroll_data . update = 1;
}
usleep(100000);
}
for (int i=0; i<THREAD_IDX_MAX; i++)
input_threads[i].keep_running = 0;
free(text_buffer);
pthread_join(scroll_data . thread_id, NULL);
turn_off_display();
for (int i=0; i<THREAD_IDX_MAX; i++)
pthread_join(input_threads[i].thread_id, NULL);
return EXIT_SUCCESS;
} // main
//
// Drop (root) privileges
//
void drop_privileges()
{
/* Drop superuser privileges in correct order */
int is_already_unprivileged = 0;
if (setgid(65534) == -1) { // nobody
perror("can't drop group privileges");
if (! (is_already_unprivileged = (errno == 1)))
exit(-1);
}
if (setuid(65534) == -1) { // nobody
perror("can't drop user privileges");
if (is_already_unprivileged != (errno == 1))
exit(-1);
}
} // drop_root
void handle_signals(int signo)
{
switch (signo) {
case SIGINT:
case SIGHUP:
case SIGTERM:
fprintf(stderr, "stopping\n");
scroll_data . keep_running = 0;
break;
case SIGUSR1:
for (int i=0; i<THREAD_IDX_MAX; i++)
input_threads[i] . force_update = 1;
scroll_data . shine_until = time(NULL) + 60;
break;
}
}
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