Enrico Fraccaroli
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
/// @file t_alarm.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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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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printf("handler(%d) : Correct signal.\n", sig);
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alarm(5);
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int rest = alarm(5);
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printf("handler(%d) : alarm(5) result: %d.\n", sig, rest);
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rest = alarm(0);
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printf("handler(%d) : alarm(0) result: %d.\n", sig, rest);
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exit(0);
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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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alarm(5);
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while (1) {}
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return EXIT_SUCCESS;
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}
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