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