103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
#include <time.h>
|
|
#include <stdio.h>
|
|
|
|
// Sleep time between daemon updates.
|
|
#define SLEEP_TIME_S 300
|
|
|
|
// Test for internet connection. Returns true if connection is established.
|
|
static int test_internet_connection()
|
|
{
|
|
const char *cmd = "nc -zw1 google.com 443 1> /dev/null 2>&1";
|
|
return !system(cmd);
|
|
}
|
|
|
|
// Signal handler for signaling the weather applet.
|
|
static void timer_handler(int sig, siginfo_t *si, void *uc)
|
|
{
|
|
(void) sig; // Ignore parameter.
|
|
(void) si; // Ignore parameter.
|
|
(void) uc; // Ignore parameter.
|
|
|
|
// Test for internet connection till found or 20 times.
|
|
for (int i = 0; i < 20; ++i)
|
|
{
|
|
if (test_internet_connection())
|
|
{
|
|
// Connection established. Break out.
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
// Retry every second.
|
|
sleep(1);
|
|
}
|
|
}
|
|
|
|
// Signal the weather applet.
|
|
const char *cmd = "pkill -RTMIN+2 i3blocks";
|
|
if ( system(cmd) )
|
|
{
|
|
// Error message should be printed to stdout since stdout is the way to
|
|
// interface with a user in i3blocks.
|
|
puts("WEATHER_SIGNALER ERROR\n");
|
|
}
|
|
}
|
|
|
|
int timer_init_launch(
|
|
timer_t *timer,
|
|
struct sigevent *sev,
|
|
struct sigaction *sa,
|
|
struct itimerspec *tspec)
|
|
{
|
|
// Event initialization.
|
|
sev->sigev_notify = SIGEV_SIGNAL;
|
|
sev->sigev_signo = SIGRTMIN;
|
|
sev->sigev_value.sival_ptr = timer;
|
|
|
|
// Signal action type initializaion.
|
|
sa->sa_flags = SA_SIGINFO;
|
|
sa->sa_sigaction = timer_handler;
|
|
sigemptyset(&sa->sa_mask);
|
|
if (sigaction(SIGRTMIN, sa, NULL) == -1)
|
|
return -1;
|
|
|
|
// Initialze timer.
|
|
if (timer_create(CLOCK_BOOTTIME, sev, timer) == -1)
|
|
return -1;
|
|
|
|
// Start the timer.
|
|
tspec->it_value.tv_sec = SLEEP_TIME_S;
|
|
tspec->it_value.tv_nsec = 0;
|
|
tspec->it_interval.tv_sec = SLEEP_TIME_S;
|
|
tspec->it_interval.tv_nsec = 0;
|
|
if (timer_settime(*timer, 0, tspec, NULL) == -1)
|
|
return -1;
|
|
|
|
// Initialization successful.
|
|
return 0;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
timer_t timer;
|
|
struct sigevent sev;
|
|
struct sigaction sa;
|
|
struct itimerspec tspec;
|
|
|
|
// Initialize signaler
|
|
if (timer_init_launch(&timer, &sev, &sa, &tspec))
|
|
exit(EXIT_FAILURE);
|
|
|
|
// Signal on daemon launch.
|
|
sleep(1);
|
|
timer_handler(0, NULL, NULL);
|
|
|
|
while(1)
|
|
{
|
|
sleep(100);
|
|
}
|
|
}
|