Enrico Fraccaroli
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/// @file t_itimer.c
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/// @brief
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/// @copyright (c) 2014-2023 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <sys/unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <strerror.h>
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#include <sys/wait.h>
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#include <time.h>
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void alarm_handler(int sig)
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{
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printf("handler(%d) : Starting handler.\n", sig);
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if (sig == SIGALRM) {
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itimerval val = { 0 };
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getitimer(ITIMER_REAL, &val);
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printf("(sec: %d, usec: %d)\n", val.it_interval.tv_sec, val.it_interval.tv_usec);
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static int counter = 0;
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counter += 1;
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printf("handler(%d) : Correct signal x%d\n", sig, counter);
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if (counter == 4)
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{
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itimerval interval = { 0 }, prev = { 0 };
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interval.it_interval.tv_sec = 0;
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setitimer(ITIMER_REAL, &interval, &prev);
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printf("prev: (sec: %d, usec: %d)", prev.it_interval.tv_sec, prev.it_interval.tv_usec);
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exit(0);
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}
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} else {
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printf("handler(%d) : Wrong signal.\n", sig);
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}
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printf("handler(%d) : Ending handler.\n", sig);
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}
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int main(int argc, char *argv[])
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{
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sigaction_t action;
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memset(&action, 0, sizeof(action));
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action.sa_handler = alarm_handler;
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if (sigaction(SIGALRM, &action, NULL) == -1) {
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printf("Failed to set signal handler (%s).\n", SIGALRM, strerror(errno));
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return EXIT_FAILURE;
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}
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itimerval interval = { 0 };
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interval.it_interval.tv_sec = 4;
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setitimer(ITIMER_REAL, &interval, NULL);
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while(1) { }
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return EXIT_SUCCESS;
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}
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